US Pat. No. 9,634,592

METHOD OF ESTIMATING ROTATIONAL POSITION OF MOTOR, AND CONTROL APPARATUS OF MOTOR

NIDEC SINGAPORE PTE., LTD...

1. A method of estimating a rotational position of a motor having saliency, the method comprising the steps of:
a) superimposing, on a drive voltage to rotate a rotating portion of the motor, a measuring voltage having a predetermined
frequency higher than a frequency of the drive voltage to generate a plurality of voltages, and supplying the plurality of
voltages to a stationary portion of the motor;

b) in parallel with step a), extracting a component of the predetermined frequency in a current flowing in the stationary
portion as an extracted current;

c) calculating a sum of squares of the extracted current and a phase-shifted current obtained by shifting a phase of the extracted
current by ?/2 to acquire a composite signal related to an amplitude of the extracted current; and

d) acquiring a rotational position of the rotating portion based on the composite signal.

US Pat. No. 9,826,661

HEAT MODULE

NIDEC CORPORATION, Kyoto...

1. A heat module comprising:
a heat receiving portion arranged to be in thermal contact with a heat source;
a fluid channel in which a coolant to transfer heat at the heat receiving portion is sealed;
a centrifugal fan having a single air outlet;
a radiator arranged at the single air outlet of the fan, the radiator including a plurality of heat dissipating fins; and
a pump including a stationary portion including a stator, and a rotating portion including a magnet arranged radially outside
of the stator, a rotor holder arranged to hold the magnet with an inner circumferential surface thereof, and a pump impeller
arranged to surround the stator radially outside of the stator, and supported to be rotatable with respect to the stator,
the pump further including a casing made of a resin and arranged to surround the pump impeller radially outside of the stator;
wherein the pump having a pump outlet and a pump inlet such that the coolant in the fluid channel is transferred from the
pump outlet through the fluid channel to a pump inlet,

wherein the fluid channel comprising a first fluid channel part, a second fluid channel part, a third fluid channel part,
a fourth fluid channel part, a fifth fluid channel part and a sixth fluid channel part,

wherein the first fluid channel part runs between the pump outlet and the radiator,
wherein each of the second fluid channel part and the fourth fluid channel part runs inside the radiator, the second fluid
channel part being parallel to the fourth fluid channel part such that the second fluid channel part is closer to the air
outlet than the fourth fluid channel part,

wherein the third fluid channel part runs between the second fluid channel part and the fourth fluid channel part,
wherein the fifth fluid channel part runs between the fourth fluid channel part and the pump inlet,
wherein the sixth fluid channel part runs inside the pump,
wherein the coolant in the fluid channel flows through the first fluid channel part, the second fluid channel part, the third
fluid channel part, the fourth fluid channel part, the fifth fluid channel part and the sixth fluid channel part in order,

wherein at least a portion of the rotor holder and at least a portion of the pump impeller are arranged to radially overlap
with each other;

wherein the fluid channel includes a heat receiving portion tube fluid channel arranged in the first fluid channel part to
transfer heat of the heat source to the coolant at the heat receiving portion

wherein no heat receiving portion tube fluid channel is arranged in the fifth fluid channel part.

US Pat. No. 9,787,165

MOTOR WITH SIMPLIFIED WINDING AND REDUCED BRUSH WEAR

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a static section;
a rotation section; and
a bearing portion which supports the rotation section rotatably around a central axis; wherein
the rotation section includes:
a shaft extending along the central axis;
an armature core including m×n teeth, where m is an odd number equal to or more than 3 and n is a natural number equal to
or more than 2, which are attached on the shaft and radially extend in a radial direction;

a plurality of coils respectively provided on the m×n teeth; and
a commutator electrically connected to the plurality of coils;
the static section includes:
field magnets including 2n magnetic poles facing the m×n teeth in the radial direction; and
a brush group including at least a first-potential brush and at least a second-potential brush;
the commutator includes a segment group defined by 2m×n segments which are arranged in a circumferential direction and in
contact with the brush group;

in at least a conducting wire defining each coil, each end portion thereof is connected to any one of the segments;
in the segment group, a potential is cyclically increased or decreased between a first potential and a second potential in
regard to the circumferential direction, due to the contact of the brush group and the commutator;

m?1 segments are provided between the first-potential segment and the second-potential segment;
the coils are connected in series between the first-potential segment and the second-potential segment via the segments;
only the coil defined by winding a continuous conducting wire in a predetermined winding direction is disposed in each of
k teeth among the m×n teeth; and

only the coil defined by winding the continuous conducting wire in a direction reverse to the predetermined winding direction
is disposed in each of teeth disposed at a position separated from each of the k teeth at 360×i degrees, where i is a natural
number equal to or less than n?1, of electric angles.

US Pat. No. 9,634,533

MOTOR WITH A STATOR HAVING FOUR SEPARATE CORNER BOBBINS/INSULATORS AND MOLDED RESIN INSULATION AROUND TOOTH COMPLETELY ENCLOSING THE COIL AND MANUFACTURING METHOD THEREOF

NIDEC CORPORATION, Kyoto...

1. A motor comprising a stationary portion and a rotating portion; wherein the stationary portion includes: a plurality of
teeth each having a shape of a column extending in a radial direction with respect to a central axis extending in a vertical
direction, each tooth including a pair of circumferential side surfaces extending in an axial direction; insulators each arranged
to cover portions of a surface of a separate one of the teeth; and coils each defined by a conducting wire wound around a
separate one of the insulators; the rotating portion is arranged radially inward of the teeth, the insulators, and the coils,
and is supported to be rotatable about the central axis with respect to the stationary portion; each insulator includes: an
upper frame portion arranged to cover a pair of upper corner portions of a corresponding one of the teeth, each upper corner
portion extending in the radial direction; a lower frame portion arranged to cover a pair of lower corner portions of the
corresponding tooth, each lower corner portion extending in the radial direction; and an opening portion arranged to extend
along the circumferential side surfaces of the corresponding tooth below the upper frame portion and above the lower frame
portion; the stationary portion further includes resin bodies defined integrally with one another to define a single monolithic
member, each resin body including: an inner resin portion arranged between a corresponding one of the teeth and a corresponding
one of the coils, and between the corresponding tooth and a corresponding one of the insulators; an outer resin portion arranged
to cover circumferentially outer sides and axially outer sides of the corresponding coil; and a connecting resin portion arranged
on a radially outer side or a radially inner side of the corresponding coil; the inner and outer resin portions are arranged
to be continuous with each other through the connecting resin portion; the inner resin portion is arranged to be in contact
with both the circumferential side surfaces of the corresponding tooth and the conducting wire in the opening portion; the
upper frame portion includes a pair of upper corner covers each arranged to extend in the radial direction; the lower frame
portion includes a pair of lower corner covers each arranged to extend in the radial direction; each insulator includes: an
upper joining portion arranged to on the upper corner covers to each other in a circumferential direction; and a lower joining
portion arranged to-join the lower corner covers to each other in the circumferential direction;
the upper joining portion has axial and radial thicknesses smaller than axial and radial thickness of each of the upper corner
covers; and

the lower joining portion has axial and radial thicknesses smaller than axial and radial thicknesses of each of the lower
corner covers; and

a portion of the coils is not axially overlapped by either of the upper joining portion and the lower joining portion.

US Pat. No. 9,148,036

BASE MEMBER OF A MOTOR WHICH INCLUDES SPECIFIC SURFACE STRUCTURE

Nidec Corporation, Kyoto...

1. A thin base member for use in a disk drive apparatus in which a bearing mechanism and an actuator are arranged, the base
member comprising:
a plurality of lower recess portions;
a C-shaped smooth surface; and
a fan-shaped recess portion; wherein
the plurality of lower recess portions are arranged in a region of a lower surface of the base member to at least partially
encircle a region where the bearing mechanism is arranged, the plurality of lower recess portions extending in a radial direction
and being recessed in an axially upward direction from the lower surface of the base member;

the C-shaped smooth surface is arranged in a region of an upper surface of the base member, provided on a side of the base
member opposite to the lower surface of the base member, around the region where the bearing mechanism is arranged, the C-shaped
smooth surface having a height substantially constant in a circumferential direction,

the fan-shaped recess portion is arranged in the region of the upper surface of the base member around the region where the
bearing mechanism is arranged, the fan-shaped recess portion being arranged to allow the actuator to come into the fan-shaped
recess portion; and

at least a portion of each of the plurality of lower recess portions is provided axially below the C-shaped smooth surface,
the C-shaped smooth surface having a cross section positioned at the plurality of lower recess portions to protrude in a direction
toward which the upper surface of the base member faces or to depress in a direction toward which the lower surface of the
base member faces.

US Pat. No. 9,369,080

MOTOR CONTROLLER

NIDEC CORPORATION, Kyoto...

1. A motor controller configured to control a switched reluctance motor comprising:
an inverter connected to the switched reluctance motor;
a torque and flux calculator configured to estimate or measure torque and flux generated in the switched reluctance motor
as calculated torque and calculated flux, based on an output from the inverter and a rotor angle of the switched reluctance
motor;

a switching pattern selector configured to input a signal to the inverter to select one of a plurality of switching patterns
based on a comparison result of a reference torque and the calculated torque, a comparison result of a reference flux and
the calculated flux, and a flux phase angle; and

a reference flux calculator configured to compare a highest phase flux out of three phase fluxes obtained by the torque and
flux calculator with a flux limit and reduce the reference flux when the highest phase flux is higher than the flux limit.

US Pat. No. 9,178,394

ROTOR AND MANUFACTURING PROCESS OF ROTOR

Nidec Corporation, Kyoto...

1. A rotor comprising:
a plurality of magnets which are arranged in a circumferential direction around a center axis that extends in a vertical direction;
a laminated core in which a plurality of thin plate cores are laminated in an axial direction; and
an injection molded resin portion; wherein
the laminated core includes an inner core portion which axially extends in a cylindrical shape in a region located farther
radially inward than the plurality of magnets, and a plurality of outer core portions which are arranged in the circumferential
direction in a region located farther radially outward than the inner core portion;

the plurality of outer core portions and the plurality of magnets are alternately arranged in the circumferential direction;
each of the plurality of magnets includes a pair of end surfaces in the circumferential direction which are magnetic pole
surfaces;

the magnetic pole surfaces of the plurality of magnets of the same pole face each other in the circumferential direction;
the outer core portion includes a through-hole which penetrates in the axial direction;
the resin portion includes an upper resin portion which covers upper surfaces of the laminated core and the plurality of magnets,
a lower resin portion which covers lower surfaces of the laminated core and the plurality of magnets, an outer resin portion
which covers radially outside surfaces of the plurality of magnets, and a columnar portion which extends in the axial direction
in the through-hole and connects the upper resin portion to the lower resin portion;

the resin portion includes a gate mark portion at which a gate of a mold is positioned during injection molding;
the gate mark portion is positioned farther radially outward than the inner core portion; and
at least a portion of the gate mark portion is positioned farther radially inward than the through-hole in plan view.

US Pat. No. 9,051,938

FAN BEARING SYSTEM HAVING A FLUID RESERVOIR

NIDEC CORPORATION, Kyoto...

1. A fan comprising:
a motor; and
an impeller including a plurality of blades, and arranged to rotate about a central axis through the motor to produce air
currents; wherein

the motor includes:
a stationary portion; and
a rotating portion rotatably supported by the stationary portion;
the stationary portion includes:
a stator; and
a bearing portion arranged inside of the stator;
the rotating portion includes:
a rotor magnet arranged radially outside the stator;
a shaft inserted in the bearing portion, and having an upper portion fixed to the impeller directly or through one or more
members; and

a first thrust portion arranged axially opposite the bearing portion, and including a first annular surface arranged around
the shaft;

a radial dynamic pressure bearing portion arranged to generate a fluid dynamic pressure in a lubricating oil is defined in
a radial gap defined between an inner circumferential surface of the bearing portion and an outer circumferential surface
of the shaft, while a first thrust dynamic pressure bearing portion arranged to generate a fluid dynamic pressure in the lubricating
oil is defined in a thrust gap defined between the first annular surface and a surface of the bearing portion which is axially
opposed to the first annular surface;

a single seal gap arranged in an annular shape and centered on the central axis is defined between the stationary and rotating
portions; and

the seal gap, the radial gap, and the thrust gap are arranged to together define a single continuous bladder structure, the
lubricating oil is arranged continuously in the bladder structure, and a surface of the lubricating oil is defined only in
the seal gap,

the first thrust portion is a thrust plate arranged to extend radially outward from the shaft at a bottom portion of the bladder
structure;

an upper surface of the thrust plate includes an upward-facing thrust dynamic pressure bearing surface defined by the first
annular surface;

the bearing portion includes a downward-facing thrust dynamic pressure bearing surface arranged to face downward in an axial
direction;

the upward-facing and downward-facing thrust dynamic pressure bearing surfaces are arranged axially opposite each other; and
the first thrust dynamic pressure bearing portion is defined by the upward-facing and downward-facing thrust dynamic pressure
bearing surfaces,

the rotating portion further includes a second thrust portion arranged to extend radially outward from the upper portion of
the shaft;

the bearing portion includes a surface arranged to face upward in the axial direction;
the second thrust portion includes a second annular surface arranged axially opposite the surface arranged to face upward
in the axial direction; and

the surface arranged to face upward in the axial direction and the second annular surface are arranged to together define
a second thrust dynamic pressure bearing portion,

the fan further comprises a cover portion having an opening, arranged axially above said plurality of blades,
in the axial direction, a first upper edge of said plurality of blades, opposed to the cover portion, is located lower than
the second annular surface.

US Pat. No. 9,318,928

BRUSHLESS MOTOR, DISK DRIVE APPARATUS AND BRUSHLESS MOTOR MANUFACTURING METHOD

NIDEC CORPORATION, Kyoto...

1. A brushless motor, comprising:
a stationary unit comprising a base member and a bearing mechanism; and
a rotary unit rotatably supported by the bearing mechanism, the rotary unit comprising a hub, a shaft, a rotor yoke and a
magnet, the shaft having a central axis,

wherein the stationary unit comprises:
a flat armature arranged radially outward of the bearing mechanism to extend in a direction orthogonal to the center axis;
and

a base member arranged to support the armature, the base member including a base through-hole extending in the up-down direction,
wherein the hub is made of a magnetic material, the hub comprising:
a top plate portion comprising an inner peripheral end, a middle portion and an outer peripheral end, the top plate portion
extended from the inner peripheral end through a middle portion to reach an outer peripheral end, the inner peripheral end
contacting the shaft, the top plate portion further comprising a first part and a second part, the first part located radially
inside the middle portion, the second part located radially outside the middle portion; and

a hub protrusion portion arranged to extend downward from the middle portion of the top plate portion,
wherein the rotor yoke is made of a magnetic material, the rotor yoke fixed to a radially outer side of the hub protrusion
portion such that the rotor yoke is axially opposed to a lower surface of the armature,

wherein the magnet is fixed to a lower surface of the second part of the hub such that the magnet is axially opposed to an
upper surface of the armature while an upper surface of the magnet is entirely covered by the second part of the top plate
portion,

wherein the base member includes an inner circumferential surface defining the base through-hole, the bearing mechanism axially
opposed to the first part of the top plate portion, the bearing mechanism including an outer circumferential surface, the
inner circumferential surface of the base member arranged to make contact with the outer circumferential surface of the bearing
mechanism or to radially oppose the outer circumferential surface of the bearing mechanism across an adhesive agent in a first
fixing portion,

wherein the rotor yoke is arranged to make contact with the hub protrusion portion or to radially oppose the hub protrusion
portion across an adhesive agent in a second fixing portion, and

wherein the brushless motor satisfies a relationship of d1>d2, where the d1 is an axial length between a lower end of a constant diameter surface of the bearing mechanism extending along the first
fixing portion or further extending downward from the first fixing portion and an upper end of a constant diameter surface
of the base member extending along the first fixing portion or further extending upward from the first fixing portion, and
the d2 is an axial length between a lower end of a constant diameter surface of the hub protrusion portion extending along the second
fixing portion or further extending downward from the second fixing portion and an upper end of a constant diameter surface
of the rotor yoke extending along the second fixing portion or further extending upward from the second fixing portion.

US Pat. No. 9,140,268

BEARING APPARATUS AND BLOWER FAN

NIDEC CORPORATION, Kyoto...

1. A bearing apparatus comprising:
a bearing portion arranged substantially in a shape of a cylinder with a bottom;
a shaft inserted in the bearing portion, and arranged to rotate about a central axis relative to the bearing portion;
an upper thrust portion arranged to extend radially outward from an upper end portion of the shaft;
a rotor cylindrical portion arranged to extend downward from an outer edge portion of the upper thrust portion, and arranged
radially outward of the bearing portion; and

an annular seal cover fixed to an outer circumferential surface of the rotor cylindrical portion; wherein
an inner circumferential surface of the rotor cylindrical portion and an outer circumferential surface of the bearing portion
are arranged to together define a seal gap therebetween, the seal gap including a seal portion having a surface of a lubricating
oil defined therein;

an inner circumferential surface of the bearing portion and an outer circumferential surface of the shaft are arranged to
together define a radial gap therebetween, the radial gap including a radial bearing portion arranged to support the shaft
in a radial direction;

an upper surface of the bearing portion and a lower surface of the upper thrust portion are arranged to together define a
thrust gap therebetween, the thrust gap including a thrust bearing portion arranged to support the upper thrust portion in
an axial direction; and

the seal cover includes:
a fixing portion fixed to the outer circumferential surface of the rotor cylindrical portion; and
an inner flange portion arranged to extend radially inward from the fixing portion below a lower end portion of the rotor
cylindrical portion, and having an inner circumferential portion arranged opposite to the outer circumferential surface of
the bearing portion to define a vertical gap together with the outer circumferential surface of the bearing portion.

US Pat. No. 9,422,974

FLUID BEARING APPARATUS INCLUDING DYNAMIC PRESSURE GROOVES WITH STRIATIONS, SPINDLE MOTOR, AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A fluid bearing apparatus comprising:
a stationary member including a bearing surface; and
a rotating member arranged to rotate about a rotation axis with respect to the stationary member, and including a bearing
surface; wherein

the bearing surface of the stationary member and the bearing surface of the rotating member are arranged opposite to each
other with a minute gap intervening therebetween, a lubricating fluid being arranged in the minute gap;

at least one of the bearing surfaces includes:
a dynamic pressure groove; and
a plurality of striations defined in a bottom portion of the dynamic pressure groove;
each of the plurality of striations is a groove recessed in a depth direction of the dynamic pressure groove;
a depth of each striation as measured from an edge portion of the striation is smaller than a depth of the dynamic pressure
groove;

each of the dynamic pressure groove and the plurality of striations is arranged to extend in a direction at an angle greater
than 0° to a circumferential direction;

an angle defined between each striation and the circumferential direction is equal to or smaller than an angle defined between
the dynamic pressure groove and the circumferential direction; and

the angle defined between the dynamic pressure groove and the circumferential direction is in a range of 10° to 30° both inclusive.

US Pat. No. 9,330,728

SPINDLE MOTOR AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A spindle motor for use in a disk drive apparatus including a cover member to be attached to the spindle motor, the spindle
motor comprising:
a rotor portion arranged to rotate about a central axis extending in a vertical direction, and including a rotor magnet;
a bearing portion arranged to support the rotor portion such that the rotor portion is rotatable about the central axis;
a stator portion arranged opposite to the rotor magnet; and
a base portion molded by casting, and arranged to contain the rotor portion, the bearing portion, and the stator portion;
wherein

the base portion includes a plate portion arranged to extend radially with respect to the central axis, and a wall portion
arranged to extend in an axial direction from a radially outer edge of the plate portion;

the wall portion includes a hole portion in which an attaching member to attach the cover member to the spindle motor is arranged,
and is arranged to support at least a portion of the cover member;

an inside surface of the base portion includes a metal surface subjected to a cutting process;
the base portion includes a recessed portion arranged between the metal surface and the hole portion; and
the recessed portion is recessed either upward or downward in the axial direction, and is arranged to overlap with at least
one of the metal surface and the hole portion when viewed in a horizontal direction perpendicular to the central axis.

US Pat. No. 9,209,658

STATOR UNIT AND MOTOR

NIDEC CORPORATION, Kyoto...

1. A stator unit comprising:
a plurality of teeth extending in a radial direction with respect to a central axis;
an insulator that covers each of the plurality of teeth; and
a coil that is defined by a conducting wire wound around the insulator; wherein
when m is set to be an integer equal to 2 or more and n is set to be an integer larger than m+1, the coil includes:
a first layer defined by a first turn to an m-th turn; and
a second layer defined by an m+1-th turn to an n-th turn;
a first turn to the m-th turn are sequentially wound around the insulator toward inside in the radial direction from outside
in the radial direction;

the m+1-th turn to the n-th turn are sequentially wound toward the outside in the radial direction from the inside in the
radial direction;

a distance between an m?1-th turn and the m-th turn is wider than each distance in the first turn to the m?1-th turn;
the insulator includes a wall portion protruding in a direction away from the tooth between the m?1-th turn and the m-th turn;
and

the m+1-th turn is in contact with the wall portion.

US Pat. No. 9,062,567

FAN

Nidec Corporation, Kyoto...

1. A fan comprising:
a stationary portion;
a rotating portion rotatably supported by the stationary portion; and
a plurality of blades arranged on an outer circumference of the rotating portion to generate a flow of air by rotation of
the rotating portion; wherein

the stationary portion includes:
a stator;
a bearing housing arranged on an inside of the stator, and defined by a molded metal integral one-piece member;
a bearing portion arranged in the bearing housing; and
a base portion made of molded resin and arranged to support the bearing housing;
the rotating portion includes:
a rotor holder having a cylindrical or substantially cylindrical shape with a cover;
a rotor magnet arranged on a radially outer side of the stator and on an inner side of an inner circumferential surface of
the rotor holder; and

a shaft connected to the cover of the rotor holder and inserted into the bearing portion;
the bearing housing includes:
a cylindrical portion; and
a protruding portion expanding radially outwards from a lower portion of the cylindrical portion;
the cylindrical portion includes, on an outer circumferential surface, at least one groove portion extending in an axial direction
and arranged in a circumferential direction; and

the at least one groove portion is joined to a region on a lower side of the protruding portion along a side of a connecting
position between the cylindrical portion and the protruding portion such that a resin positioned on an upper side of the protruding
portion as a portion of the base portion, a resin positioned on a lower side, and a resin existing in the at least one groove
portion are all continuously provided with one another.

US Pat. No. 9,484,058

SPINDLE MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A spindle motor comprising:
a rotor portion including a rotor magnet;
a bearing portion arranged to support the rotor portion such that the rotor portion is rotatable about a central axis extending
in a vertical direction of the rotor portion;

a stator portion arranged opposite to the rotor magnet;
a base portion including a tubular holder portion arranged to hold the bearing portion inside thereof; and
a fixing portion defined by the bearing portion, the holder portion, a gap between the bearing portion and the holder portion,
and an adhesive arranged in the gap; wherein

the gap is arranged to extend in an annular shape in a circumferential direction;
the fixing portion includes:
an annular first protruding surface arranged to protrude radially from a first one of an outside surface of the bearing portion
and an inside surface of the holder portion, and an annular second protruding surface arranged to protrude radially from a
second one of the outside surface of the bearing portion and the inside surface of the holder portion;

a first boundary surface arranged below the first protruding surface, and arranged to join the first surface and the first
protruding surface to each other; and

a second boundary surface arranged above the second protruding surface, and arranged to join the second surface and the second
protruding surface to each other;

at least a portion of the first boundary surface is arranged above the second boundary surface;
the first protruding surface is arranged radially opposite to the second surface with a first gap intervening therebetween;
the second protruding surface is arranged radially opposite to the first surface with a second gap intervening therebetween;
the first boundary surface is arranged opposite to the second boundary surface with a third gap intervening therebetween;
and

the adhesive is arranged to extend from the third gap to both at least a portion of the first gap and at least a portion of
the second gap.

US Pat. No. 9,166,452

SPINDLE MOTOR, DISK DRIVE APPARATUS, AND ELECTRONIC DEVICE

Nidec Corporation, Kyoto...

1. A spindle motor comprising:
a stationary portion; and
a rotary portion including a magnet, the rotary portion being configured to rotate about a center axis extending in an up
and down direction; wherein

the stationary portion includes a base portion, a stator including a plurality of coils and positioned above the base portion,
and a circuit substrate disposed in the base portion;

the base portion includes a flat plate portion positioned below the rotary portion and extending radially outward with respect
to the center axis, and at least one through-hole extending from an upper surface to a lower surface of the flat plate portion;

the flat plate portion includes a first surface positioned between the upper surface and the lower surface of the flat plate
portion and disposed within the through-hole;

the circuit substrate includes a land portion to which at least one lead wire extending from the plurality of coils is electrically
connected;

the land portion is disposed on the first surface; and
the lead wire is connected to the land portion by solder within the through-hole.

US Pat. No. 9,458,852

CENTRIFUGAL FAN HAVING A FLOW CONTROL MEMBER

NIDEC CORPORATION, Kyoto...

1. A centrifugal fan comprising:
an impeller centered on a central axis extending in a vertical direction;
a motor portion arranged to rotate the impeller about the central axis; and
a housing arranged to accommodate the impeller; wherein
the housing includes:
an upper plate portion arranged to cover an upper side of the impeller;
a lower plate portion arranged to cover a lower side of the impeller, and arranged to have the motor portion fixed thereto;
and

a side wall portion arranged to cover a side of the impeller, and arranged to define an air outlet together with the upper
and lower plate portions;

at least one of the upper and lower plate portions includes an air inlet;
the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air channel
portion arranged to surround the impeller;

a boundary between an inside surface of the side wall portion and one of a lower surface of the upper plate portion and an
upper surface of the lower plate portion is arranged to have a member arranged thereon, the member extending in a line along
the boundary; and

the member includes a flow control surface arranged to extend radially outward from the one of the lower surface of the upper
plate portion and the upper surface of the lower plate portion to the inside surface of the side wall portion while becoming
more distant from the one of the lower surface of the upper plate portion and the upper surface of the lower plate portion
wherein
the side wall portion includes:
a first side wall portion arranged to extend in a curve along an outer circumference of the impeller on an opposite side of
the impeller with respect to the air outlet;

a second side wall portion arranged to extend from the first side wall portion in a rotation direction of the impeller; and
a third side wall portion arranged to extend from the first side wall portion in a direction opposite to the rotation direction
of the impeller;

the member is arranged on a boundary between an inside surface of the first side wall portion and the one of the lower surface
of the upper plate portion and the upper surface of the lower plate portion; and

the first side wall portion is arranged to have a thickness smaller than that of each of the second and third side wall portions.

US Pat. No. 9,450,457

SPINDLE MOTOR, DISK DRIVE APPARATUS, AND METHOD OF MANUFACTURING SPINDLE MOTOR

NIDEC CORPORATION, Kyoto...

1. A spindle motor comprising:
a stationary portion; and
a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary
portion; wherein

the stationary portion includes:
a base portion made of a metal material and arranged to extend radially around the central axis;
a sheet made of a resin material and fixed to an upper surface of the base portion; and
a coil arranged over the base portion;
the base portion includes a base hole arranged to extend through the base portion in an axial direction;
the sheet includes:
a sheet hole arranged to be continuous with the base hole; and
an annular edge portion of the sheet which defines a periphery of the sheet hole, and has an axial thickness greater than
that of remaining portions of the sheet; and

a conducting wire defining the coil is arranged to pass through the sheet hole and the base hole to reach a lower side of
the base portion.

US Pat. No. 9,404,502

CENTRIFUGAL FAN DEVICE

NIDEC CORPORATION, Kyoto...

1. A centrifugal fan device, comprising:
an impeller supported to rotate about a center axis extending in an up-down direction;
a motor arranged to rotate the impeller; and
a housing arranged to surround the impeller; wherein
the housing includes an intake portion positioned above the impeller and an exhaust portion positioned radially outward of
the impeller;

the impeller includes a base extending in a direction perpendicular or substantially perpendicular to the center axis, a ring-shaped
shroud positioned above the base and having a diameter which decreases as it goes upward, and a plurality of blades existing
between the base and the shroud;

the intake portion includes a cylinder portion positioned radially inward of an upper end portion of the shroud to extend
in an axial direction, a top plate portion extending radially outward from an upper end portion of the cylinder portion and
an outer shell portion extending downward and radially outward from a radial outer edge of the top plate portion;

the housing further includes a plurality of ribs protruding from an inner surface of the intake portion toward the shroud;
and

the ribs are spaced apart from one another at intervals in a circumferential direction of the centrifugal fan device.

US Pat. No. 9,352,408

SOLDER JOINT STRUCTURE AND SOLDER JOINING METHOD

NIDEC CORPORATION, Kyoto...

1. A solder joint structure comprising:
a metal pin in a shape of a prism or a circular or substantially circular cylinder;
an aluminum wire including a wound portion wound around the metal pin; and
a solder layer arranged to join the metal pin and at least one portion of the wound portion to each other; wherein
the at least one portion of the wound portion includes a deformed surface resulting from a partial elimination of the aluminum
wire in a cross-section perpendicular or substantially perpendicular to a direction in which the aluminum wire extends, and
the solder layer is directly adhered to the deformed surface.

US Pat. No. 9,071,179

SINGLE-PHASE BRUSHLESS MOTOR

Nidec Corporation, Kyoto...

1. A single-phase brushless motor comprising:
a rotor that is rotated about a rotation shaft;
a stator that faces the rotor with a gap;
a plurality of coils that are provided on the stator and configured so as to be driven in a single phase;
a sensor that detects a magnetic pole position based on rotation of the rotor; and
an energization mechanism that drives the rotor at a predetermined rotational speed by switching an energizing direction with
respect to the coil based on magnetic pole information which is output from the sensor; wherein

the energization mechanism switches a rectangular wave energization in which a voltage applied to the coil represents a rectangular
waveform and a pseudo-sine wave energization in which applied voltage represents a waveform of a pseudo-sine wave, and switching
between the rectangular wave energization and the pseudo-sine wave energization is performed by gradually changing the waveform;
and

in the pseudo-sine wave energization, the waveform of the applied voltage in the half period portion corresponds to a sine
curve shape which is gradually changed by being continued in a stepwise manner.

US Pat. No. 9,368,149

DISK DRIVE SPINDLE MOTOR WITH ADHESIVE CONNECTION BETWEEN SHAFT FLANGE AND BEARING CUP

Nidec Corporation, Kyoto...

1. A motor comprising:
a stationary portion including a base portion, a bearing cup portion, a shaft, and a stator; and
a rotating portion including a sleeve portion, a rotor hub extending radially outward from the sleeve portion, and a rotor
magnet fixed to the rotor hub; wherein

the shaft includes a shaft portion and a flange portion extending radially outward from an outer circumferential surface of
the shaft portion;

the sleeve portion includes a bearing hole configured to accommodate at least a portion of the shaft;
the bearing cup portion includes a cylindrical wall surrounding an outer circumference of the sleeve portion, and a plate
portion in a shape of a circular or annular plate and extending radially inward from an inner circumferential surface of the
cylindrical wall;

the flange portion includes a first flange surface which is a cylindrical surface extending in an axial direction and facing
radially outward, and a second flange surface which is a circular or annular surface extending radially from the first flange
surface;

the plate portion includes a first plate surface which is a cylindrical surface extending in the axial direction and facing
radially inward, and a second plate surface which is a circular or annular surface extending radially from the first plate
surface;

the first flange surface and the first plate surface are positioned opposite to each other to define a first adhesive portion,
the first adhesive portion including an adhesive therein;

the second flange surface and the second plate surface are positioned opposite to each other to define a second adhesive portion,
the second adhesive portion including an adhesive therein;

the adhesive in the first adhesive portion is continuous with the adhesive in the second adhesive portion; and
the first plate surface extends axially upward higher than the second plate surface and towards an axial middle portion of
the shaft.

US Pat. No. 9,194,434

SPINDLE MOTOR AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A spindle motor for use in a disk drive apparatus configured to rotate a disk including a circular hole at a center thereof
in a case including a base plate and a top cover arranged to cover an upper side of the base plate, the spindle motor comprising:
a stationary portion;
a rotating portion configured to be rotatable about a central axis extending in a vertical direction;
a fluid dynamic bearing including a lubricant oil, and arranged to support the rotating portion; and
a seal portion connected with the fluid dynamic bearing, and including a liquid surface of the lubricant oil located therein;
wherein

the stationary portion includes:
a shaft extending along the central axis; and
a stator including a plurality of coils having an annular or substantially annular shape with the central axis as a center;
the rotating portion includes:
a rotating portion body including a central through hole in which at least a portion of the shaft is accommodated; and
a magnet opposite to the stator with a gap intervening therebetween;
the rotating portion body includes:
a cylindrical first disk support surface located within the circular hole of the disk; and
a disk-shaped second disk support surface extending radially outward from the first disk support surface, and configured to
have the disk mounted thereon;

an annular space is intervening between the top cover and the rotating portion body inside the case;
the annular space is in communication with both the first disk support surface and the liquid surface;
the rotating portion body further includes at least one air hole including an upper opening in communication with the annular
space, and a lower opening in communication with the gap; and

the upper opening is located radially outward of the liquid surface and radially inward of the first disk support surface.

US Pat. No. 9,088,191

ARMATURE AND MOTOR

Nidec Corporation, Kyoto...

1. An armature comprising:
a core back;
a plurality of teeth arranged to extend radially inward or radially outward from the core back;
insulators, each of which is arranged to cover a separate one of the teeth; and
coils, each of which is defined by a conducting wire wound around a separate one of the insulators; wherein
each insulator includes an upper resin member and a lower resin member;
the upper resin member includes:
a top plate portion arranged to cover an upper surface of a corresponding one of the teeth;
a pair of upper side wall portions, each of which is arranged to extend downward from a separate circumferential end portion
of the top plate portion to cover an upper region of a separate one of circumferential side surfaces of the tooth;

a pair of first upper decreased thickness portions, each of which is arranged to extend further downward from a lower end
portion of a separate one of the upper side wall portions, each of the pair of first upper decreased thickness portions having
a circumferential thickness smaller than that of each upper side wall portion; and

a first upper rib;
the lower resin member includes:
a bottom plate portion arranged to cover a lower surface of the tooth;
a pair of lower side wall portions, each of which is arranged to extend upward from a separate circumferential end portion
of the bottom plate portion to cover a lower region of a separate one of the circumferential side surfaces of the tooth;

a pair of first lower decreased thickness portions, each of which is arranged to extend further upward from an upper end portion
of a separate one of the lower side wall portions, each of the pair of first lower decreased thickness portions having a circumferential
thickness smaller than that of each lower side wall portion; and

a first lower rib;
an axial position of each of the first upper decreased thickness portions and the first upper rib is arranged to overlap at
least partially with an axial position of each of the first lower decreased thickness portions and the first lower rib;

the first upper rib is arranged to project in a circumferential direction from a surface of a corresponding one of the first
upper decreased thickness portions toward a corresponding one of the first lower decreased thickness portions;

the first lower rib is arranged to project in the circumferential direction from a surface of a corresponding one of the first
lower decreased thickness portions toward a corresponding one of the first upper decreased thickness portions;

each of the circumferential thickness of each first upper decreased thickness portion and a combined circumferential thickness
of the first upper decreased thickness portion and the first upper rib is arranged to decrease with decreasing height or to
be uniform;

each of the circumferential thickness of each first lower decreased thickness portion and a combined circumferential thickness
of the first lower decreased thickness portion and the first lower rib is arranged to decrease with increasing height or to
be uniform;

a radial width of the first upper rib is arranged to decrease with decreasing height or to be uniform; and
a radial width of the first lower rib is arranged to decrease with increasing height or to be uniform.

US Pat. No. 9,366,263

BEARING APPARATUS, MOTOR, AND BLOWER FAN

NIDEC CORPORATION, Kyoto...

1. A bearing apparatus comprising:
a bearing portion having a bottom and being substantially cylindrical;
a shaft inserted in the bearing portion, and arranged to rotate about a central axis relative to the bearing portion;
a bearing opposing portion defined in one piece, arranged above the bearing portion, and arranged to hold an upper end portion
of the shaft while covering an outer circumferential surface upper portion and an upper end surface of the shaft; and

a cylindrical seal portion arranged to extend downward from the bearing opposing portion; wherein
an inner circumferential surface of the cylindrical seal portion and an outer circumferential surface of the bearing portion
are arranged to together define a seal gap therebetween, the seal gap including a seal portion having a surface of a lubricating
oil defined therein;

an inner circumferential surface of the bearing portion and an outer circumferential surface of the shaft are arranged to
together define a radial gap therebetween, the radial gap including a radial dynamic pressure bearing portion arranged to
radially support the shaft; and

the lubricating oil is arranged in a gap defined between a lower surface of the bearing opposing portion and an upper surface
of the bearing portion,

the cylindrical seal portion includes:
a cylindrical seal base portion defined integrally with the bearing opposing portion, and arranged to extend downward from
the bearing opposing portion; and

a cylindrical seal bushing fixed to an inner circumferential surface of the seal base portion; and
the seal gap is defined between an inner circumferential surface of the seal bushing and the outer circumferential surface
of the bearing portion.

US Pat. No. 9,183,876

SPINDLE MOTOR AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A spindle motor comprising:
a sleeve including a bearing hole;
a holding portion including a hole or a recessed portion configured to accommodate a portion of the sleeve;
a stator located radially outside of the holding portion, and including a plurality of coils; and
a rotor hub configured to rotate about a central axis extending in a vertical direction; wherein
the rotor hub includes a circular first horizontal surface, a cylindrical surface, and an annular second horizontal surface;
the first horizontal surface is located above the sleeve;
the cylindrical surface extends downward from the first horizontal surface;
the second horizontal surface is located above the stator;
the rotor hub further includes a projecting portion that projects downward from the second horizontal surface, and surrounds
the sleeve or the holding portion;

the cylindrical surface and an outer circumferential surface of the sleeve are configured to together define a tapered gap
therebetween where a radial distance between the cylindrical surface and the outer circumferential surface of the sleeve decreases
with increasing height;

the tapered gap includes a liquid surface of a lubricating fluid defined therein;
the holding portion, the projecting portion, and the coils are radially arranged in order;
at least portions of the holding portion, the projecting portion, and the coils are positioned to radially overlap with one
another;

an outer circumferential surface of the holding portion is located radially opposite to an inner circumferential surface of
the projecting portion with a minute gap intervening therebetween;

the minute gap has a radial width smaller than the radial distance between the cylindrical surface and the outer circumferential
surface of the sleeve; and

the minute gap is located below the tapered gap.

US Pat. No. 9,509,196

MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor, comprising:
a stator around which an armature coil is wound;
a bus bar unit including a coil-connection bus bar electrically connected to the armature coil and an electronic-component-connection
bus bar to which a plurality of electronic components is welded; and

a bus bar holding member configured to hold the bus bar unit; wherein
the electronic-component-connection bus bar includes an electronic component welding portion including a plurality of welding
points at which the electronic components are welded to a leading end of the electronic component welding portion, a base
portion held by the bus bar holding member, and a connection portion configured to interconnect the electronic component welding
portion and the base portion, a distance between the welding points adjoining each other being larger than a width of a thinnest
section of the connection portion.

US Pat. No. 9,369,019

SPINDLE MOTOR AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A spindle motor comprising:
a stationary portion; and
a rotating portion arranged to rotate about a central axis extending in a vertical direction with respect to the stationary
portion; wherein

the stationary portion includes:
a stator portion including a stator core including an annular core back and a plurality of tooth portions arranged to extend
radially outward from the core back, and coils wound around the plurality of tooth portions;

an outside surface press fitted to an inside surface of the core back; and
a fixing member arranged at least on an upper surface of the core back;
conducting wires defining the coils include:
passage lines each of which is arranged to join different ones of the coils to each other; and
lead wires each of which is drawn out from one of the coils, and is drawn out from an upper side of upper surfaces of the
tooth portions to a lower side of lower surfaces of the tooth portions;

each of the passage lines and the lead wires is arranged radially outward of the inside surface of the core back; and
the fixing member is arranged to fix at least a portion of each passage line and at least a portion of each lead wire to the
stator core.

US Pat. No. 9,397,527

STATOR UNIT AND MOTOR

Nidec Corporation, Kyoto...

1. A stator unit comprising:
a plurality of teeth extending in a radial direction with respect to a central axis;
an insulator that covers each of the plurality of teeth; and
a coil that is defined by a conducting wire wound around the insulator; wherein
when m is set to be an integer equal to 2 or more and n is set to be an integer larger than m+1, the coil includes:
a first layer defined by a first turn to an m-th turn; and
a second layer defined by an m+1-th turn to an n-th turn;
a first turn to the m-th turn are sequentially wound around the insulator toward inside in the radial direction from outside
in the radial direction;

the m+1-th turn to the n-th turn are sequentially wound toward the outside in the radial direction from the inside in the
radial direction;

a distance between an m?1-th turn and the m-th turn is wider than each distance in the first turn to the m?1-th turn;
the m+1-th turn is disposed between the m?1-th turn and the m-th turn;
in a cross-section perpendicular or substantially perpendicular to the central axis and passing through the tooth, an angle
between a line segment connecting respective centers of the m+1-th turn and the m?1-th turn and a line segment connecting
respective centers of the m+1-th turn and the m-th turn is more than or equal to about 120° and less than about 180°; and

a space is provided between the m+1-th turn and the insulator.

US Pat. No. 9,209,656

BRUSHLESS MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A brushless motor, comprising:
a stationary unit; and
a rotary unit rotatably supported with respect to the stationary unit,
wherein the stationary unit includes a flat armature arranged to extend in a direction orthogonal to a center axis extending
in an up-down direction and a base member arranged to support the armature,

the rotary unit includes a magnet positioned above the armature, a hub made of a magnetic material and arranged to hold the
magnet, and a rotor yoke made of a magnetic material and provided with a portion positioned below the armature,

the armature includes a plurality of coil patterns arranged along a circumferential direction, and
the hub includes an inner lower surface positioned radially inward of the magnet, an outer lower surface positioned radially
outward of the magnet, and a recess portion arranged between the inner lower surface and the outer lower surface and depressed
upward, at least a portion of the magnet accommodated within the recess portion, at least one of the inner lower surface and
the outer lower surface positioned above a lower surface of the magnet.

US Pat. No. 9,160,217

BUSBAR UNIT AND MOTOR

Nidec Corporation, Kyoto...

1. A busbar unit arranged on an axial end portion of a stator, and electrically connected with a plurality of coil wire terminals
arranged to project in an axial direction above the axial end portion of the stator, the busbar unit comprising:
a plurality of busbars each including a body portion defined by an electrically conductive wire having an annular or “C” shape;
a holder member arranged on the axial end portion of the stator to hold the busbars; and
a plurality of terminal members each including a busbar connection portion connected with the body portion of one of the busbars
and a coil connection portion connected with one of the coil wire terminals; wherein

the holder member is defined by a plurality of annular holders placed one upon another in the axial direction, each of the
holders including an accommodating groove in an annular shape or in a “C” shape arranged to separately accommodate and hold
the body portion of a separate one of the busbars and a lead groove arranged to accommodate and hold an external connection
portion of the each of the busbars to allow the external connection portion to be drawn from the accommodating groove in a
radial direction.

US Pat. No. 9,145,899

PUMP DEVICE WITH TURNING PREVENTION PROTRUDED PART TO PREVENT TURNING OF A FIRST CASE RELATIVE TO A SECOND CASE

NIDEC CORPORATION, (JP)

1. A pump device comprising:
a first case provided with a circular ring-shaped protruded part;
a second case which is provided with a circular ring-shaped stepped part into which the circular ring-shaped protruded part
is coaxially inserted and which partitions a pump chamber on an inner peripheral side of the circular ring-shaped stepped
part together with the first case;

an O-ring which is mounted on a circular outer peripheral face of the circular ring-shaped protruded part and is crushed between
the circular outer peripheral face of the circular ring-shaped protruded part and a circular inner peripheral face of the
circular ring-shaped stepped part in a direction perpendicular to an axial line of the circular ring-shaped protruded part;

a turning preventing protruded part which is provided in the first case and is extended to the second case; and
a recessed part which is provided in the second case so that the turning preventing protruded part fits into the recessed
part in an axial direction;

wherein the turning preventing protruded part is located at a position separated to an outer side from the circular ring-shaped
protruded part and the recessed part is at a position separated to an outer side from the circular ring-shaped stepped part
so as to be abutted with the turning preventing protruded part in a circumferential direction; and

wherein, when the turning preventing protruded part engages the recessed part, an axial distance between a tip end part of
the turning preventing protruded part to an upper end face of the second case is greater than or equal to an axial distance
between the upper end face of the of the second case to a circular ring-shaped end face of the of the circular ring-shaped
stepped part.

US Pat. No. 9,360,019

FAN

NIDEC CORPORATION, Kyoto...

1. A blower fan comprising:
an impeller including a plurality of blades arranged to rotate about a central axis extending in a vertical direction and
arranged in a circumferential direction, and an annular blade support portion arranged to support the blades;

a motor portion arranged to rotate the impeller; and
a housing arranged to contain the impeller; wherein
the housing includes:
a lower plate portion arranged to cover a lower side of the impeller, and arranged to support the motor portion;
a side wall portion arranged to cover a lateral side of the impeller, and including at least one opening each of which opens
into an exterior space outside the blower fan, each of the at least one opening extending over a circumferential extent; and

an upper plate portion arranged to cover an upper side of the impeller, and including an air inlet;
the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air outlet
on the lateral side of the impeller;

a space joining a space above the impeller and a space between the impeller and the lower plate portion to each other in an
axial direction is defined between adjacent ones of the blades of the impeller;

the blower fan further comprises a heat source contact portion with which a heat source is to be in contact, the heat source
contact portion being arranged in a surface of the blower fan which faces away from the impeller;

the air outlet is a plane parallel to the central axis, and including one of an edge of the upper plate portion, a pair of
edges which are circumferential ends of the opening of the side wall portion, and an edge of the lower plate portion that
is the closest to the central axis;

the side wall portion includes a tongue portion arranged to project between the air outlet and the impeller;
when an imaginary straight line which is parallel to the air outlet and which intersects with the central axis in a plan view
is defined as a first imaginary straight line, and an imaginary straight line which is perpendicular to the air outlet and
which intersects with the central axis in the plan view is defined as a second imaginary straight line;

of four regions divided by the first and second imaginary straight lines, a region in which the tongue portion is arranged
is defined as a first region, and the three other regions are defined as a second region, a third region, and a fourth region
in an order in which the three regions are arranged in a rotation direction of the impeller from the first region;

an imaginary straight line which is tangent to an outer circumferential surface of the blade support portion and which extends
in parallel with the second imaginary straight line toward the air outlet in the first region is defined as a third imaginary
straight line; and

an imaginary straight line which is tangent to the outer circumferential surface of the blade support portion and which extends
in parallel with the first imaginary straight line in the third region is defined as a fourth imaginary straight line;

at least a portion of the air outlet is arranged in the fourth region; and
the heat source contact portion is arranged to cover a portion of a region surrounded by the third imaginary straight line,
the fourth imaginary straight line, the outer circumferential surface of the blade support portion, and the air outlet.

US Pat. No. 9,493,064

WHEEL UNIT

NIDEC CORPORATION, Kyoto...

1. A wheel unit, comprising:
a motor;
a pinion gear which is fixed to a rotating portion of the motor;
a wheel which includes an annular ground surface and rotates about a final gear support shaft;
a final gear made of a resin, which is fixed to the wheel directly or via another member and is disposed on one side in an
axial direction with respect to the wheel;

a speed reduction mechanism which decelerates rotation of the pinion gear and transmits the rotation to the final gear; and
a gear case which accommodates the pinion gear, the speed reduction mechanism, and the final gear, wherein
a rotation support portion which rotates along with the final gear and the wheel while being supported by the gear case directly
or via another member is provided between the final gear and the wheel; and

at least a portion of the final gear is positioned on an inside of a cylindrical or substantially cylindrical area surrounded
by the ground surface; and

when viewed from one side in the axial direction, the final gear support shaft and a motor shaft are disposed in different
positions and the speed reduction mechanism has at least three composite gears each of which has a large diameter gear portion
and a small diameter gear portion, and

a first support shaft which supports a first composite gear, a second support shaft which supports a second composite gear
engaging with the first composite gear, and a third support shaft which supports a third composite gear engaging with the
second composite gear are arranged such that, the first support shaft and the second support shaft define an angle ?1 relative to the final gear support shaft, and the second support shaft and the third support shaft define an angle ?2 relative to the final gear support shaft, wherein each of the angles ?1 and ?2 is 90° or smaller.

US Pat. No. 9,336,817

SPINDLE MOTOR AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A spindle motor for use in a disk drive apparatus including a cover member to be attached to the spindle motor, the spindle
motor comprising:
a rotor portion arranged to rotate about a central axis extending in a vertical direction, and including a rotor magnet;
a bearing portion arranged to support the rotor portion such that the rotor portion is rotatable about the central axis;
a stator portion arranged opposite to the rotor magnet;
a base portion molded by casting, and arranged to contain the rotor portion, the bearing portion, and the stator portion;
and

a screw attachment member fixed to the base portion, and including a screw hole; wherein
the base portion includes a plate portion arranged to extend radially with respect to the central axis, and a wall portion
arranged to extend in an axial direction from a radially outer edge of the plate portion;

the wall portion is arranged to support at least a portion of the cover member;
an inside surface of the base portion includes a metal surface subjected to a cutting process; and
the screw attachment member is arranged on the wall portion.

US Pat. No. 9,303,653

DYNAMIC PRESSURE BEARING APPARATUS AND FAN

NIDEC CORPORATION, Kyoto...

1. A dynamic pressure bearing apparatus comprising:
a bearing portion, the bearing portion comprising:
a sleeve made of a metallic sintered body, the sleeve having an inner circumferential surface, an outer circumferential surface
and an upper surface; and

a bearing housing comprising an annular upper portion and a circumferential body, the annular upper portion inwardly extended
from the circumferential body, a lower surface of the annular upper portion covering the upper surface of the sleeve, and
an inner surface of the circumferential body covering the outer circumferential surface of the sleeve,

a shaft inserted in the bearing portion, and arranged to rotate about a central axis relative to the bearing portion, an outer
circumferential surface of the shaft including an attachment surface to which an impeller is to be attached directly or through
one or more members;

a radial dynamic pressure bearing portion defined by an inner circumferential surface of the bearing portion, the outer circumferential
surface of the shaft, and a portion of a lubricating oil which exists in a radial gap defined between the inner circumferential
surface of the bearing portion and the outer circumferential surface of the shaft, and arranged to generate a fluid dynamic
pressure in the portion of the lubricating oil;

a seal gap defined by the outer circumferential surface of the shaft and an inner surface of the annular upper portion, the
seal gap including a seal portion having a surface of the lubricating oil defined therein; and

an annular member arranged in an annular shape, the annular member fixed to an upper surface of the annular upper portion
such that the annular member is radially opposed to an outer circumferential surface of the shaft,

a vertical gap extending in an axial direction, the vertical gap defined between the outer circumferential surface of the
shaft and an inner circumferential surface of the annular member, the seal gap opposed to the vertical gap in the axial direction;

a minimum radial width of the vertical gap is arranged to be smaller than a maximum radial width of an opening of the seal
gap; and

the seal gap is arranged to be in communication with an exterior space through the vertical gap.

US Pat. No. 9,058,833

SPINDLE MOTOR, AND DISK DRIVE APPARATUS INCLUDING THE SPINDLE MOTOR

Nidec Corporation, Kyoto...

1. A spindle motor for use in a disk drive apparatus to drive a disk, the disk drive apparatus including a housing defining
an interior space, the spindle motor comprising:
a stationary portion including a shaft which extends in an axial direction;
a base portion configured to define a portion of the housing, and including a through hole into which the shaft is inserted;
and

a rotating portion configured to rotate about a central axis with respect to the stationary portion through a bearing mechanism;
wherein

the shaft includes:
a non-through hole portion extending downward from an upper end of the shaft;
a first connection channel extending from the hole portion in a radial direction to connect the hole portion with an interior
of the bearing mechanism; and

a second connection channel extending from the hole portion in the radial direction to connect the hole portion with a space
defined on a lower side of the bearing mechanism; wherein

an upper portion of the hole portion includes a screw hole portion including a screw thread;
a minimum diameter of the screw thread is greater than an inside diameter of the hole portion;
a sealing member is positioned between the screw hole portion and the first connection channel; and
the interior space, the second connection channel, the hole portion, and the first connection channel together define a continuous
space.

US Pat. No. 9,341,189

FAN

NIDEC CORPORATION, Kyoto...

1. A fan comprising:
a motor comprising a stationary portion and a rotating portion rotatably supported by the stationary portion;
an impeller including a blade support and a plurality of blades, and arranged to rotate about a central axis through the motor
to produce air currents, wherein the blade support comprising a blade support fixing portion and a blade support portion wherein
said plurality of blades are fixed to the motor via the fixing portion and the blade support portion, the blade support portion
being radially outside the fixing portion; and

a housing including a cover portion, the housing accommodating the motor and the impeller, the cover portion having an opening
to expose the motor, wherein the stationary portion includes:

a stator; and
a bearing portion arranged inside of the stator, the bearing portion comprising an upper end surface;
wherein the rotating portion includes:
a rotor magnet arranged radially outside the stator;
a shaft comprising a shaft portion and a top plate portion, the shaft portion inserted in the bearing portion, the shaft portion
having an upper end extending radially outward to the top plate portion, the top plate portion comprising a first annular
surface at a lower surface thereof and a portion fixed to the impeller directly or through one or more members; and

wherein a radial dynamic pressure bearing portion arranged to generate a fluid dynamic pressure in a lubricating oil is defined
in a radial gap defined between an inner circumferential surface of the bearing portion and an outer circumferential surface
of the shaft, while a first thrust dynamic pressure bearing portion arranged to generate a fluid dynamic pressure in the lubricating
oil is defined in a thrust gap defined between the first annular surface and the upper end surface;

wherein a single seal gap arranged in an annular shape and centered on the central axis is defined between the stationary
and rotating portions; and

wherein the seal gap, the radial gap, and the thrust gap are arranged to together define a single continuous bladder structure,
the lubricating oil is arranged continuously in the bladder structure, and a surface of the lubricating oil is defined only
in the seal gap,

wherein each of the blades has a first part and a second part, the first part axially overlapped with the cover portion and
the second part axially exposed to the opening, a radial length LA of the first part being longer than a radial length LB of the second part,

wherein the opening of the cover portion has a radial length LC larger than the radial length LA of the first part, the radial length LC being a length between an outer periphery of the opening and an outer periphery of the blade support fixing portion,

wherein the blade support has a radial length LF and an axial length LE, wherein the radial length LF of the blade support is larger than the axial length LE thereof,

wherein a radial length LD extending from a radially innermost end of the blade support to a radially innermost end of the second part is larger than
the radial length LB of the second part, wherein the blade support portion has an upper end located at a level lower than an upper end of the first
part,

wherein the upper end of the first part of each blade is arranged at a level lower than that of the first thrust dynamic pressure
bearing portion.

US Pat. No. 9,257,874

ROTOR UNIT, ROTATING ELECTRICAL MACHINE, AND METHOD OF MANUFACTURING ROTOR UNIT

NIDEC CORPORATION, Kyoto...

1. A rotor unit for a rotating electrical machine, comprising:
a plurality of rotating bodies arranged along a central axis; wherein
each of the plurality of rotating bodies includes:
an annular rotor core surrounding the central axis;
a plurality of magnets arranged in a circumferential direction around the rotor core; and
a holder arranged to hold the plurality of magnets;
each of the holders includes a plurality of partitioning portions each axially extending between respective ones of the plurality
of magnets;

an axial dimension of the plurality of partitioning portions is longer than an axial dimension of the plurality of magnets
held by the plurality of partitioning portions;

the plurality of rotating bodies is disposed in a state in which circumferential positions of the plurality of magnets of
respective ones of the plurality of rotating bodies are out of alignment; and

the partitioning portions of one of the holders and the partitioning portions of another one of the holders overlap in an
axial direction when viewed from the circumferential direction.

US Pat. No. 9,366,262

FAN MOTOR

NIDEC CORPORATION, Kyoto...

1. A fan motor comprising:
a motor that rotates a rotating portion thereof about a central axis extending in a vertical direction;
an impeller that rotates together with the rotating portion to produce an axial air current;
a motor control board that supplies drive currents to coils of the motor;
an AC/DC converter board that converts an alternating current supplied from an external power supply into a direct current,
and supplies the direct current to the motor control board;

electronic components mounted on the AC/DC converter board;
a housing that contains the motor, the impeller, the motor control board, and the AC/DC converter board; and
a cover portion including a bottom plate portion; wherein
the housing includes:
a base portion that holds a stationary portion of the motor on an axially upper side thereof; and
a case portion that extends to assume a tubular shape on an axially lower side of the base portion;
the AC/DC converter board is located in an interior space of the case portion;
at least a portion of the interior space of the case portion is filled with a resin material;
surfaces of the AC/DC converter board and the electronic components are covered with the resin material;
the bottom plate portion closes a lower opening defined in the case portion;
the fan motor further comprises a projecting portion that is defined together with the bottom plate portion as a single monolithic
member, the projecting portion extending into the interior space of the case portion; and

a lower surface of the AC/DC converter board and an upper surface of the projecting portion are arranged axially opposite
each other.

US Pat. No. 9,130,423

ROTOR AND MOTOR

NIDEC CORPORATION, (JP)

7. A motor comprising:
a stator;
a shaft;
a cylindrical rotor core centered on a central axis, the rotor core comprising:
a shaft hole centered on the central axis and having the shaft fixed therein;
a plurality of first recessed portions;
a plurality of elongated grooves provided in an outer circumferential surface of the rotor core;
wherein each of the plurality of first recessed portions and each of the plurality of elongated grooves are arranged to extend
substantially in parallel with the shaft hole;

each of the plurality of elongated grooves is provided between a pair of adjacent first recessed portions in a circumferential
direction; and

each of the plurality of elongated grooves is provided with a locking portion recessed radially inward;
a plurality of magnets, each of the plurality of magnets being disposed in one of the plurality of first recessed portions;
and

a stopper attached to an axial end of the rotor core, the stopper comprising:
a base portion configured to close each of the plurality of first recessed portions; and
a plurality of hook portions arranged on the base portion;
wherein each of the plurality of hook portions is elastically deformable; and
each of the plurality of hook portions is configured to be inserted into one of the plurality of elongated grooves and to
be engaged with the locking portion therein;

the rotor core further comprises a plurality of annular plates arranged coaxially, the plurality of annular plates comprising
third plates and fourth plates;

each of the third plates comprises a plurality of third locking elements, wherein each of the plurality of third locking elements
comprises a portion of one of the plurality of elongated grooves;

each of the fourth plates comprises a plurality of fourth locking elements, wherein each of the plurality of fourth locking
elements comprises a portion of one of the plurality of elongated grooves, each fourth locking element being recessed to a
greater extent than each third locking element; and

the locking portion of each of the plurality of elongated grooves is configured by arranging the fourth plates axially inward
and from the third plates.

US Pat. No. 9,388,827

BLOWER FAN

NIDEC CORPORATION, Kyoto...

1. A blower fan comprising:
a stationary portion;
a bearing portion; and
a rotating portion supported by the bearing portion to be rotatable with respect to the stationary portion; wherein
the rotating portion includes:
a shaft arranged to extend along a central axis extending in a vertical direction, and inserted in the bearing portion;
a blade support portion arranged radially outward of the shaft, and arranged to rotate about the central axis together with
the shaft; and

a plurality of blades arranged in an annular shape radially outside the blade support portion, and arranged to rotate about
the central axis together with the shaft;

the stationary portion includes:
a lower plate arranged to cover the blades from below, and arranged to hold the bearing portion directly or indirectly;
an upper plate arranged to cover the blades from above; and
a side wall portion arranged to cover the blades from radially outside, and having a lower end portion fixed to the lower
plate;

edges of the side wall portion at both ends of an opening of the side wall portion, an edge of the upper plate which extends
between the edges of the side wall portion, and an edge of the lower plate which extends between the edges of the side wall
portion are arranged to together define an air outlet;

an inside surface of the bearing portion, an outside surface of the shaft, and a lubricating oil arranged in a radial gap
defined between the inside surface of the bearing portion and the outside surface of the shaft are arranged to together define
a radial dynamic pressure bearing portion arranged to generate a fluid dynamic pressure in the lubricating oil;

axially opposed surfaces of the bearing portion and the rotating portion and the lubricating oil arranged in a thrust gap
defined between these surfaces are arranged to together define a thrust dynamic pressure bearing portion arranged to generate
a fluid dynamic pressure in the lubricating oil in the thrust gap;

the lower plate includes a lower air inlet arranged to pass through the lower plate in the vertical direction, and arranged
radially outward of the bearing portion;

the upper plate includes an upper air inlet arranged to pass through the upper plate in the vertical direction;
an inside surface of the side wall portion includes a tongue portion where a radial distance between the inside surface of
the side wall portion and any of the blades is shortest;

in a plan view, a plane is divided into four regions by a first straight line which is parallel to the air outlet and crosses
the central axis and a second straight line which is perpendicular to the air outlet and crosses the central axis, and one
of the four regions in which the tongue portion is arranged is a first region, followed by a second region, a third region,
and a fourth region in this order in a rotation direction of the blades;

the air outlet is arranged to extend over both the first and fourth regions;
at least a portion of the lower air inlet is arranged in the fourth region; and
a radial distance between the central axis and a radially outer edge of the lower air inlet is arranged to be longest in the
fourth region,

wherein a circumferential position of a point on an edge of the upper air inlet where a distance between the edge of the upper
air inlet and the central axis is longest in the fourth region is arranged to axially coincide with a circumferential position
of a point on the radially outer edge of the lower air inlet where a distance between the radially outer edge of the lower
air inlet and the central axis is longest in the fourth region.

US Pat. No. 9,057,379

CENTRIFUGAL FAN AND METHOD FOR MANUFACTURING THE SAME

Nidec Corporation, Kyoto...

1. A blower fan comprising:
an impeller centered on a central axis extending in a vertical direction;
a motor portion arranged to rotate the impeller about the central axis; and
a housing arranged to accommodate the impeller; wherein the housing includes:
an upper plate portion arranged to cover an upper side of the impeller;
a lower plate portion arranged to cover a lower side of the impeller, and arranged such that the motor portion is fixed thereto;
and

a side wall portion arranged to cover a side of the impeller, and to define an air outlet in combination with the upper plate
portion and the lower plate portion;

at least one of the upper plate portion and the lower plate portion includes an air inlet defined therein;
the lower plate portion is defined by a sheet having a lower surface coated with a paint, the lower plate portion including
an outer circumferential cut surface;

the side wall portion is made of a resin;
a lower end portion of the side wall portion and an edge portion of the lower plate portion are directly and integrally joined
to each other, with the outer circumferential cut surface of the lower plate portion arranged in contact with the side wall
portion at a joint between the lower end portion of the side wall portion and the edge portion of the lower plate portion;
and

the outer circumferential cut surface of the lower plate portion is fixedly embedded within the side wall portion through
insert molding.

US Pat. No. 9,097,256

VORTEX PUMP DEVICE WITH WIRING OUTLET PART

NIDEC CORPORATION, (JP)

1. A vortex pump device comprising:
a rotor and a stator which are coaxially disposed with each other;
an impeller which is provided in the rotor;
a pump case which forms a pump chamber in which the impeller is disposed and a stator accommodating chamber partitioned from
the pump chamber, a side face of the pump case being provided with a suction pipe and a discharge pipe;

wherein the pump case is provided with an outer peripheral wall surrounding an upper space formed on an upper side with respect
to a stator accommodating position in the stator accommodating chamber, the outer peripheral wall forming a side face of the
pump case;

a base plate which is disposed in the upper space;
a sealing agent which is filled in the pump case to a height covering the base plate; and
a wiring outlet part for taking out a wiring line within the pump case to an outer side;
and
wherein the wiring outlet part comprises:
a wiring outlet port formed by cutting out the outer peripheral wall;
a wire placing part on which the wiring line taken out from the wiring outlet port to the outer side is placed; and
a fixing member with which the wiring line is sandwiched and fixed between the wire placing part, the fixing member being
attached so as to close the wiring outlet port;

the fixing member is located at a lower position than an end face on an upper side of the outer peripheral wall,
the sealing agent is filled to a lower position with respect to the upper surface of the fixing member,
the fixing member is formed with a pair of fitting grooves which are formed by cutting out edge portions in a widthwise direction
of the fixing member;

the fixing member comprises an outer width portion which is located radially outward of the fitting grooves, an inner width
portion which is located radially inward of the fitting grooves, and a narrow portion connected between the outer width portion
and the inner width potion;

wherein end parts of the outer peripheral wall facing across the wiring outlet port are respectively fitted to the fitting
grooves; and

a groove side face of the fitting groove to which the end part of the outer peripheral wall is fitted and a surface of the
outer peripheral wall diametrically facing the groove side face form a labyrinth structure part.

US Pat. No. 9,252,073

HEAT SINK AND HEAT SINK FAN

NIDEC CORPORATION, Kyoto...

1. A heat sink comprising:
a plurality of fins arranged radially about a center axis and spaced away from one another, the plurality of fins extending
outward in a radial direction perpendicular or substantially perpendicular to the center axis; and

a core arranged to couple and to support inner sides of the plurality of fins; wherein
each of the plurality of fins includes:
a main fin connected to the core and extending radially outwards; and
a pair of branch fins which are branched in a circumferential direction from a branch point as a radially outer end of the
main fin, and which extend radially outwards;

among the plurality of fins, in each of three fins which are adjacent in the circumferential direction, a width of an end
portion including the end of the main fin viewed along the center axis expands radially outwards at an angle which is larger
than an expanding angle of the pair of branch fins;

among the three fins, a difference between a distance from the center axis to the branch point in the center one of the fins
and a distance from the center axis to the branch point in each of the other two fins is equal to or larger than a width of
a root of the main fin in the center one of the fins; and

in an innermost branch radiating fin of which the branch point is positioned on an innermost side among the three fins, a
value obtained by dividing a distance between ends of the air of branch fins by a length of the branch fin is smaller than
a value obtained in the same way in a radiating fin which is adjacent to the innermost branch radiating fin anon the three
fins.

US Pat. No. 9,316,229

MOTOR AND FAN

NIDEC CORPORATION, Kyoto...

1. A fan comprising:
a motor
an impeller arranged to rotate together with a rotating portion of the motor; and
a casing arranged to accommodate the rotating portion and the impeller; and
wherein the motor comprises:
a stationary portion; and
a rotating portion supported by the stationary portion through a bearing mechanism, and arranged to rotate about a central
axis extending in a vertical direction; wherein

the rotating portion includes a magnet in which magnetic poles are arranged in a circumferential direction, or a plurality
of magnets arranged in the circumferential direction;

the stationary portion includes:
an armature including coils arranged around the central axis;
a base plate arranged below the armature to support the bearing mechanism; and
a circuit board arranged on an upper surface or a lower surface of the base plate;
the base plate comprising:
an inner bottom plate portion arranged to extend in directions away from the central axis below the armature;
an elevated portion arranged to extend in the directions away from the central axis radially outside and above the inner bottom
plate portion;

a junction portion arranged to join an outer edge of the inner bottom plate portion and an inner edge of the elevated portion
to each other; and

an air hole passing through the base plate in the axial direction radially outside the elevated portion, the air hole having
a through hole portion inwardly extending to reach the inner bottom plate portion such that the through hole portion partially
passes through the junction portion;

the circuit board provided on the base plate, the circuit board comprising:
a land portion arranged on a lower surface of the circuit board, on the elevated portion, and radially outside the armature,
wherein a conducting wire extending from the coils is electrically connected to the land portion;

an inclined portion arranged above the junction portion; and
an outlet passing through the inclined portion in the axial direction;
wherein the land portion and the through hole portion are arranged to overlap with each other in the axial direction,
wherein the conducting wire is drawn from the coils radially outward beyond the inclined portion through the outlet and the
through hole portion to be connected to the land portion.

US Pat. No. 9,362,798

OUTER-ROTOR MOTOR

NIDEC CORPORATION, Kyoto...

1. An outer-rotor motor comprising:
a stationary portion;
a rotating portion; and
a bearing mechanism arranged to support the rotating portion such that the rotating portion is rotatable about a central axis
extending in a vertical direction with respect to the stationary portion;

wherein
the stationary portion comprises:
a stator including a stator core arranged on an outer circumference of the bearing mechanism, the stator having an upper end
and a lower end;

a mounting plate arranged below the stator to support the bearing mechanism;
a guide structure;
a lead wire supported by the guide structure, and
a circuit board arranged between the mounting plate and the stator, the circuit board opposed to the lower end of the stator;
the rotating portion includes:
a columnar shaft arranged to extend along the central axis and project in an axial direction from the circuit board;
a rotor holder including a cylindrical portion centered on the central axis, and arranged to cover the stator; the rotor holder
surrounding the upper end of the stator, and

a rotor magnet arranged on an inner circumferential surface of the cylindrical portion of the rotor holder, and including
an inner circumferential surface arranged radially opposite the stator core;

the mounting plate includes a projecting portion such that the projecting portion is arranged radially outside the cylindrical
portion;

the guide structure has a first portion and a second portion,
the first portion of the guide structure is connected with the projecting portion;
the second portion of the guide structure extends to a portion axially above, and radially outside, the rotor holder; and
the lead wire is electrically connected to the circuit board, and is provided on the guide structure such that the lead wire
is guided from the first portion to the second portion,

the guide structure integral with the mounting plate is a single member.

US Pat. No. 9,613,651

BEARING APPARATUS, SPINDLE MOTOR, AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A bearing apparatus comprising a shaft portion, a sleeve portion, and a fluid arranged between the shaft portion and the
sleeve portion, wherein
the shaft portion includes:
a columnar portion arranged to extend along a central axis;
an annular portion arranged to extend radially outward from the columnar portion; and
a tubular portion arranged to extend from the annular portion to one axial side;
the sleeve portion is arranged on the one axial side of the annular portion, radially outside of the columnar portion, and
radially inside of the tubular portion;

the shaft portion and the sleeve portion have a gap therebetween, the gap including:
a radial dynamic pressure portion defined in a gap between an outer circumferential surface of the columnar portion and an
inner circumferential surface of the sleeve portion;

a thrust dynamic pressure portion defined in a gap between a first thrust surface and a second thrust surface, the first thrust
surface being an end surface of the annular portion on the one axial side, the second thrust surface being an end surface
of the sleeve portion on another axial side; and

a seal portion defined in a gap between an inner circumferential surface of the tubular portion and an outer circumferential
surface of the sleeve portion;

each of the radial dynamic pressure portion and the thrust dynamic pressure portion is filled with the fluid;
the seal portion has a surface of the fluid defined therein;
the thrust dynamic pressure portion includes:
a dynamic pressure generation portion including a plurality of thrust dynamic pressure grooves defined in one of the first
and second thrust surfaces, each thrust dynamic pressure groove extending from a radially inner side to a radially outer side;

an intermediate portion arranged radially outside of the dynamic pressure generation portion, and including an annular groove
in a shape of a circular ring with the central axis as a center defined in one of the first and second thrust surfaces; and

a discharge portion arranged radially outside of the annular groove, and including a plurality of discharge grooves defined
in one of the first and second thrust surfaces, each discharge groove extending from the radially inner side to the radially
outer side; and

the annular groove is arranged to have a depth smaller than a minimum radial width of the seal portion.

US Pat. No. 9,154,010

ARMATURE AND MOTOR INCLUDING ARMATURE

Nidec Corporation, Kyoto...

1. An armature comprising:
a tooth portion;
an insulator that is mounted on the tooth portion; and
a conducting wire that is wound around the tooth portion via the insulator; wherein
the insulator includes a first member and a second member that are combined with each other;
the first member includes a first end wall that covers an upper side end in an axial direction of a winding portion in which
the conducting wire is wound around the tooth portion, and a pair of plate-shaped first side walls that extend from the first
end wall to a lower side of the insulator in the axial direction and covers both side portions of the winding portion;

at least one of the pair of first side walls includes a first abdominal portion that extends to the first end wall, and a
first overlap portion that is positioned closer to the lower side than the first abdominal portion and has a thickness which
is thinner than a thickness of the first abdominal portion;

the second member includes a second end wall that covers a lower side end of the winding portion of the tooth portion, and
a pair of plate-shaped second side walls that extend from the second end wall to an upper side of the insulator in the axial
direction and cover both side portions of the winding portion;

at least one of the pair of second side walls includes a second abdominal portion that extends to the second end wall, and
a second overlap portion that is positioned closer to the upper side than the second abdominal portion and which has a thickness
which is thinner than a thickness of the second abdominal portion;

the first overlap portion is disposed farther from an outer side of the insulator than the second overlap portion in a thickness
direction in the at least one of the pair of first side walls in a state where the first member and the second member are
combined with each other; and

a plurality of ribs extending from the lower side to the upper side in an axial direction of the first overlap portion is
disposed at an outer surface in the thickness direction of the first overlap portion.

US Pat. No. 9,048,778

ROTOR PHASE/SPEED ESTIMATING DEVICE FOR AN AC MOTOR

Nidec Corporation, Kyoto...

1. A rotor phase/speed estimating device for an AC motor in which a rotor shows a salient pole characteristic with respect
to a high-frequency current having a frequency higher than a drive frequency, the estimating device being arranged to perform
a stator voltage application function and a stator current detection function, the estimating device comprising:
a high-frequency voltage injection unit arranged to superimpose a high-frequency voltage having a zero DC component and using
a high frequency ?h as a fundamental frequency onto a drive voltage and then to apply the superimposed high-frequency voltage to the AC motor,
on a ?-? semi-synchronous coordinate system composed of a ? axis to be synchronized with a phase of a rotating rotor with
a fixed phase difference represented by a zero phase difference and a ? axis orthogonal to the ? axis;

a high-frequency current amplitude detection unit of a fundamental wave component arranged to detect a primary Fourier coefficient
equivalent value by obtaining a stator current from the drive control device and then subjecting the stator current or the
? axis and ? axis components of a high-frequency current equivalent value obtained by processing the stator current, to Fourier
series development equivalent processing in which a high frequency ?h is used as a fundamental frequency;

a correlation signal generation unit arranged to generate a correlation signal having correlation with a rotor phase evaluated
on the ?-? semi-synchronous coordinate system, using the Fourier coefficient equivalent value detected from the ? axis and
? axis components; and

a rotor phase generation unit arranged to generate a phase of the ?-? semi-synchronous coordinate system and at least one
of an estimated value of the rotor phase and an estimated value of a rotor speed remaining in a calculus relationship with
the rotor phase.

US Pat. No. 9,082,450

SPINDLE MOTOR AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A spindle motor comprising:
a stationary portion; and
a rotating portion configured to be rotatable about a rotation axis extending in a vertical direction with respect to the
stationary portion; wherein

the stationary portion includes:
a base member extending in directions perpendicular to the rotation axis;
a stator core positioned axially above the base member;
coils attached to the stator core, and including lead wires; and
a circuit board located on a lower surface of the base member;
the base member includes:
a middle region which is a flat surface which surrounds the rotation axis;
an outer circumferential portion positioned radially outside the middle region, the outer circumferential portion being an
arc extending more than 180° around the middle region to define a major arc;

a peripheral region positioned radially outside the middle region, and positioned axially above the middle region;
jetty portions including a pair of extension portions, each of which is continuous with the middle region and extends in a
direction away from the rotation axis, and arm portions, each of which extends from a tip portion of a separate one of the
pair of extension portions in a direction different from a direction in which a corresponding one of the extension portions
extends, the jetty portions are positioned at least axially below the peripheral region, and a portion of the jetty portion
positioned at least radially outside the outer circumferential portion;

a recessed portion located inside the jetty portions, and in which a portion of the circuit board is provided; and
at least one through hole positioned radially inward of the outer circumferential portion which passes through the middle
region in an axial direction;

the lead wires of the coils are passed through the at least one through hole to reach a lower side of the base member, and
are electrically connected to the circuit board; and

the recessed portion is covered with a sealant.

US Pat. No. 9,097,262

AXIAL FLOW FAN

Nidec Corporation, Kyoto...

1. A fan, comprising:
a motor; and
an impeller including a plurality of blades, the impeller being rotated by the motor about a center axis to generate airflow;
wherein

the motor includes a stationary portion and a rotor portion arranged to rotate with respect to the stationary portion;
the impeller includes a substantially cylindrical impeller holder portion fixed to the rotor unit;
the blades extend radially outward from an outer surface of the impeller holder portion;
each of the blades includes a trailing edge portion positioned rearmost in a rotation direction and a leading edge portion
positioned foremost in the rotation direction;

on a cross section of each of the blades intersecting an imaginary cylindrical surface of an arbitrary diameter about the
center axis, L1/L2 decreases from a radial inner side toward a radial outer side, where L1 denotes a longest distance on the imaginary cylindrical surface between a curved line interconnecting the trailing edge portion
and the leading edge portion at a shortest distance on the imaginary cylindrical surface and a camber line equally spaced
apart from a lower surface of each of the blades facing downward in the direction of the center axis and from an upper surface
of each of the blades facing upward in the direction of the center axis, and L2 denotes a length of the curved line; and

a camber position of L1 is shifted toward the leading edge portion as each of the blades extends from the radial inner side to the radial outer side.

US Pat. No. 9,613,650

SPINDLE MOTOR, DISK DRIVE APPARATUS, AND METHOD OF MANUFACTURING BASE UNIT OF SPINDLE MOTOR

NIDEC CORPORATION, Kyoto...

1. A disk drive with a spindle motor, comprising:
a stationary portion including an armature and a base plate to which the armature is fixed;
a rotating portion including a magnet, and arranged to rotate about a rotation axis with respect to the stationary portion;
and

a head portion that performs at least one of reading and writing of information from or to a disk supported by the rotating
portion of the spindle motor; wherein

the base plate is defined by press working, casting, or forging;
the base plate includes:
a flat reference surface;
a plate-shaped support fitting portion that extends parallel or substantially parallel to the reference surface, the support
fitting portion including a recessed lower surface which is recessed axially higher than a lower surface of the base plate
which completely circumferentially surrounds the recessed lower surface; and

a hole portion that passes through the support fitting portion;
the head portion is positioned to rotate about an axis defined by a substantially columnar support, the substantially columnar
support extending along a central axis and fitted to the hole portion by crimping, press fitting, or welding;

the support fitting portion includes a melting mark defined at at least a portion of the recessed lower surface surrounding
the support, the melting mark being depressed axially upward; and

a central angle of the melting mark is in the range of 60° to 120°, both inclusive.

US Pat. No. 9,190,880

SPINDLE MOTOR, AND DISK DRIVE APPARATUS INCLUDING THE SPINDLE MOTOR

Nidec Corporation, Kyoto...

1. A spindle motor for use in a disk drive apparatus, the spindle motor comprising:
a housing defining an interior space;
a bearing mechanism including a shaft portion extending in an axial direction;
a stationary portion including a base portion defining a portion of the housing; and
a rotating portion configured to rotate about a central axis with respect to the stationary portion through the bearing mechanism;
wherein

the base portion includes a through hole in which the bearing mechanism is fitted;
a fixing region is located between an inner circumferential portion of the base portion which defines the through hole and
an outer circumferential portion of the bearing mechanism;

the fixing region includes:
a first region at which the inner circumferential portion of the base portion and the outer circumferential portion of the
bearing mechanism are fixed to each other; and

a second region located below the first region, and at which a seal gap is located between the inner circumferential portion
of the base portion and the outer circumferential portion of the bearing mechanism;

the inner circumferential portion of the base portion has, at least in the second region, a degree of surface roughness greater
than a degree of surface roughness of the outer circumferential portion of the bearing mechanism;

the seal gap gradually decreases in radial width with increasing height, and includes an adhesive along an entire circumference
of the seal gap;

the shaft portion includes a columnar shaft extending along the central axis; and
the fixing region is located between the inner circumferential portion of the base portion and an outer circumferential portion
of the shaft.

US Pat. No. 9,416,785

FAN MOTOR

NIDEC CORPORATION, Kyoto...

1. A fan motor comprising:
a stationary portion; and
a rotating portion supported to be rotatable with respect to the stationary portion; wherein
the stationary portion includes:
an armature that is coaxial with a central axis extending in a vertical direction;
a circuit board positioned below the armature; and
a base member that supports the armature and the circuit board;
the rotating portion includes:
a magnet positioned radially outside the armature; and
an impeller that rotates together with the magnet;
the base member includes:
a bottom plate portion that extends in directions perpendicular or substantially perpendicular to the central axis below the
circuit board;

a cylindrical bearing support portion that extends upward from the bottom plate portion; and
a screw receiving portion that projects upward from the bottom plate portion on a radially outer side of the bearing support
portion;

the impeller includes an air inlet located above the armature;
the circuit board includes a hole portion extending therethrough in an axial direction;
at least a portion of the screw receiving portion is located in the hole portion with a circumferential gap extending around
an entirety of the circuit board hole portion between the screw receiving portion and the circuit board,

the fan motor further includes a lead wire fixed to a lower surface of the circuit board,
the circuit board includes a fixing portion to which the lead wire is fixed,
the lead wire extends radially outward from the fixing portion along the lower surface of the circuit board, and
the base member includes:
an outer wall portion that extends upward from an outer circumferential portion of the bottom plate portion; and
an outlet that extends through the outer wall portion in a radial direction; and
the lead wire extends radially outward out of the outer wall portion through the outlet.

US Pat. No. 10,072,672

FAN

NIDEC CORPORATION, Kyoto...

1. A blower fan comprising:an impeller including a plurality of blades arranged to rotate about a central axis extending in a vertical direction and arranged in a circumferential direction, and a blade support portion arranged to support the blades;
a motor portion arranged to rotate the impeller; and
a housing arranged to contain the impeller; wherein
the housing includes:
a lower plate portion arranged to cover a lower side of the impeller, arranged to support the motor portion, and made of a material having a thermal conductivity of 1.0 W/(m·K) or more; and
a side wall portion arranged to cover a lateral side of the impeller, connected with the lower plate portion, and made of a material having a thermal conductivity of 1.0 W/(m·K) or more;
a channel joining a space above the impeller and a space between the impeller and the lower plate portion to each other in an axial direction is defined between adjacent ones of the blades of the impeller;
an upper plate portion arranged to cover an upper side of the impeller includes an air inlet;
the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air outlet on the lateral side of the impeller;
the blower fan further comprises a heat source contact portion with which a heat source is to be in direct contact, the heat source contact portion being arranged in a surface of the lower plate portion which faces away from the impeller;
the air outlet is a plane parallel to the central axis, and including one of an edge of the upper plate portion, a pair of edges of the side wall portion, and an edge of the lower plate portion that is the closest to the central axis; and
the side wall portion includes a tongue portion arranged to project between the air outlet and the impeller; and
the heat source contact portion and the tongue portion are arranged to at least partially overlap with each other in the plan view.

US Pat. No. 10,063,115

ROTOR INCLUDING SPECIFIC MAGNET STRUCTURE AND MOTOR PROVIDED WITH SAME

NIDEC CORPORATION, Kyoto...

1. A rotor used for an inner rotor-type motor, comprising:a plurality of magnets arranged in a circumferential direction around a vertically extending center axis; and
a rotor core made of a magnetic material, wherein
the rotor core comprises:
an inner core portion which is provided on a radially inner side than the magnet, and axially extends in a cylindrical shape; and
a plurality of outer core portions which is provided on a radially outer side than the inner core portion, and are arranged in the circumferential direction,
the plurality of outer core portions and the plurality of magnets are alternately arranged in the circumferential direction,
the magnet includes a pair of circumferential end surfaces which are magnetic surfaces,
ones of the magnetic surfaces having identical magnetic polarities of the plurality of magnets are disposed to face each other in the circumferential direction,
one of the pair of circumferential end surfaces is a protruded surface which protrudes farther than a plane connecting an inner end and an outer end thereof, and includes an apex portion which is at a farthest point from the plane,
one of the pair of circumferential end surfaces is a flat surface,
the magnet includes a portion of which a circumferential width is wider than a circumferential width of an outer end surface, and is defined by a magnet piece, and
each of the protruded surfaces and the flat surfaces are directly opposed to respective ones of the plurality of outer core portions.

US Pat. No. 9,812,932

MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a stationary portion; and
a rotating portion configured to rotate about a rotation axis extends in a vertical direction; wherein
the rotating portion includes:
a shaft extending along the rotation axis; and
a rotor configured to rotate together with the shaft;
the stationary portion includes:
a stator located radially outside of the rotor; and
a magnetic sensor located above the rotor to detect a rotational position of the rotor;
the rotor includes:
a tubular rotor core including a ferromagnetic body and fixed to the shaft;
a rotor magnet located radially outside of the rotor core and under the magnetic sensor, in contact with the rotor core or
located opposite to the rotor core with a first gap intervening therebetween, and including an upper end surface located at
an axial level higher than an axial level of an upper end surface of the rotor core; and

at least one rotor holder including a ferromagnetic body, and located above the rotor core and radially inside of the rotor
magnet, the rotor holder being defined by laminated steel sheets;

the rotor core is defined by laminated steel sheets placed one upon another in an axial direction; and
the rotor holder includes an outer cylindrical portion in contact with the rotor magnet or located opposite to the rotor magnet
with a second gap intervening therebetween.

US Pat. No. 9,954,410

MOTOR

Nidec Corporation, Kyoto...

1. A motor, comprising:a rotary unit which rotates on a vertical center axis;
a stationary unit which is disposed around the rotary unit; and
a bearing mechanism which rotatably supports the rotary unit relative to the stationary unit,
wherein the rotary unit comprises:
a plurality of magnets arranged in a circumferential direction;
a rotor core provided with a plurality of magnetic steel plates laminated in an axial direction; and
a resin portion covering the plurality of magnets and the rotor core,
when seen from above, a radial length of each of the plurality of magnets is longer than its circumferential length,
the rotor core comprises:
a ring-shaped inner core portion disposed on a radially inner side of the plurality magnets;
an outer core portion disposed on a radially outer side of the inner core portion; and
a plurality of connecting portions connecting the outer core portion and the inner core portion in a radial direction,
the outer core portion having a plurality of outer core elements which are connected to the inner core portion through the plurality of connecting portions, and
the resin portion comprises:
an upper resin portion covering at least a part of a top surface of the rotor core and at least a part of a top surface of each magnet; and
a lower resin portion covering at least a part of a bottom surface of the rotor core and at least a part of a bottom surface of each magnet,
the upper resin portion including a plurality of gate holes for insert molding of the resin portion, and
the lower resin portion comprising:
a first core support mark exposing a part of the bottom surface of the rotor core in a more radially inner side from the plurality of outer core elements; and
a second core support mark exposing a part of the bottom surface of the rotor core in the outer core portion.

US Pat. No. 10,050,483

MOTOR AND METHOD OF MANUFACTURING THE SAME

NIDEC CORPORATION, Kyoto...

1. A motor, comprising:a rotor having a shaft which has its center on a center axis extending in one direction;
a stator which surrounds the rotor in the axial circumference, and comprises a plurality of coils; and
bus bars connecting coil ends extending from the coils,
wherein the bus bars comprise a plate shape member bent in a thickness direction, a width direction of the bus bars being identical to an axial direction of the motor, and each of the bus bars comprises a main body portion, and a coil end connection portion which extends from the main body portion and grips one of the coil ends at an opening that is open toward one direction within a plane perpendicular to the axial direction,
wherein the coil end connection portion comprises a pair of gripping pieces, the gripping pieces being configured to face each other, and respectively contact a circumferential surface of the coil end, and
one end portion of at least one gripping piece of the pair of gripping pieces is connected to the main body portion, and an other end potion of said gripping piece is connected to an other end portion of the other gripping piece.

US Pat. No. 9,837,113

SPINDLE MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A spindle motor comprising:
a stationary portion; and
a rotating portion configured to rotate about a central axis extending in a vertical direction with respect to the stationary
portion; wherein

the stationary portion includes:
a stator portion including a stator core including a plurality of tooth portions, and coils wound around the plurality of
tooth portions; and

an outside surface which extends in an axial direction parallel or substantially parallel to the central axis and which is
centered on the central axis;

a fixing portion at which an inside surface of the stator core and the outside surface are fixed to each other is provided;
the fixing portion includes a first press fit portion, a second press fit portion, and a gap arranged therein;
the gap is located between the first press fit portion and the second press fit portion;
the second press fit portion is located above the first press fit portion, and at least a portion of the second press fit
portion is located above a middle of the stator core in the axial direction;

the stationary portion includes a base portion;
the base portion includes a tubular portion including the outside surface and which extends in the axial direction;
the cylindrical portion includes a first groove portion recessed radially inward from the outside surface;
the gap is defined by the first groove portion and the inside surface of the stator core; and
a first adhesive is located between the first groove portion and the inside surface of the stator core.

US Pat. No. 9,496,761

INNER ROTOR MAGNET HOLDER

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a stationary section; and
a rotating section which rotates around a central axis extending vertically,
wherein the stationary section comprises:
a stator core having a plurality of teeth; and
a coil comprising a conducting wire wound around each of the teeth,
the rotating section comprises:
a plurality of magnets arranged in a circumferential direction in an area radially inside the coil;
a rotor core having an outer peripheral surface which comes into contact with radially inner surfaces of the magnets; and
a magnet holder holding the magnets between the magnet holder and the rotor core,
wherein each magnet has a circumferential end face at each of both end portions in the circumferential direction,
the magnet holder comprises:
a columnar portion axially extending between adjacent magnets among the plurality of magnets; and
a wall surface spreading in the circumferential direction from the columnar portion,
the wall surface comes into contact with a surface arranged radially outside the circumferential end face of the magnet,
the circumferential end face on one side of the magnet faces the columnar portion with a gap interposed therebetween in the
circumferential direction;

the circumferential end face on the other side of the magnet contacts with the columnar portion;
the length between the circumferential end faces increase from the inner side of the magnet;
the magnet comprises a curved surface and an inclined surface,
on one side, the wall surface contacts the curved surface and the inclined surface; and
on an other side, the wall surface contacts the curved surface, the inclined surface, and the circumferential end faces.

US Pat. No. 9,087,544

BRUSHLESS MOTOR HAVING CHUCKING MECHANISM, AND DISK DRIVING DEVICE HAVING THE BRUSHLESS MOTOR

NIDEC CORPORATION, Kyoto...

1. A brushless motor having a chucking mechanism operable to detachably place thereon an optical disk including a central
opening portion, the brushless motor comprising:
a shaft having an axis;
a rotor magnet rotating along with the shaft;
a rotor holder held by the shaft;
a turn table member on the rotor holder, wherein the turn table member comprises:
a through hole;
an indented receiving portion radially outside the through hole, the indented receiving portion comprising: a first accommodating
portion having a first accommodating surface extending axially; and a second accommodating portion having a second accommodating
surface extending radially, the second accommodating portion being located radially inside, and lower than, the first accommodating
portion; and

an uppermost surface radially outside the indented receiving portion;
a cone shaped member arranged above the turn table member, the cone shaped member being able to align the optical disc in
operation, wherein the cone shaped member comprises:

a slidable surface movable along the shaft;
a first surface extending radially, the first surface being radially outside the slidable surface;
a second surface radially and upward extending from the first surface, the second surface being in an inclined manner,
a third surface extending from the second surface, the third surface extending axially, and
a fourth surface extending from the third surface, the fourth surface extending radially,
a coiled spring arranged between the second accommodating surface and the fourth surface, the coiled spring comprising a first
turn located at an uppermost position, a second turn second to the first turn, and a third turn located at a lowermost position,
the third turn having a radius larger than that of the first turn; and

a yoke member arranged above the slidable surface.

US Pat. No. 9,064,530

MOTOR AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A motor, comprising:
a stationary portion;
a rotary portion including a rotor magnet; and
a bearing mechanism supporting the rotary portion so as to rotate with respect to the stationary portion about a center axis
extending in an up-down direction; wherein

the stationary portion includes a stator positioned radially inward of the rotor magnet, a base portion positioned below the
stator and a stator fixing portion defined in a cylindrical or substantially cylindrical shape to extend upward from a central
portion of the base portion, the stator being fixed to an outer circumferential surface of the stator fixing portion;

the stator includes a stator core and a plurality of coils;
the stator core includes an annular core-back, a plurality of teeth portions extending radially outward from the core-back,
and a plurality of lug portions extending radially inward from the core-back within a plane perpendicular or substantially
perpendicular to the center axis;

each of the plurality of teeth portions includes a coil winding portion wound with each of the coils and a tip end portion
positioned radially outward of the coil winding portion, the tip end portion having a circumferential width larger than a
smallest width of the coil winding portion;

the core-back includes a slanted portion extending radially outward and upward;
an axial position of a magnetic center of the rotor magnet overlaps with an axial existence range of the tip end portion;
and

a thickness of the slanted portion in a direction perpendicular or substantially perpendicular to an upper surface of the
slanted portion is smaller than an axial thickness of the coil winding portion.

US Pat. No. 9,348,379

FAN

NIDEC CORPORATION, Kyoto...

1. A blower fan comprising:
a stationary portion;
a bearing mechanism; and
a rotating portion supported by the bearing mechanism to be rotatable about a central axis extending in a vertical direction
with respect to the stationary portion; wherein

the stationary portion includes:
a lower plate portion arranged to extend in directions away from the central axis;
an annular stator arranged on the lower plate portion; and
a circuit board;
the rotating portion includes:
an annular rotor magnet arranged radially inside the stator;
a rotor hub portion to which the rotor magnet is directly fixed or indirectly fixed with another member intervening therebetween;
and

an impeller portion fixed to the rotor hub portion;
the impeller portion includes a plurality of blades arranged in a circumferential direction;
at least a portion of each of the blades is arranged above the stator;
when a side wall portion arranged to surround an outer circumference of the impeller portion and an upper plate portion arranged
above the impeller portion are present, the lower plate portion is arranged to define an air channel portion in which an air
is caused by the impeller portion to flow in the circumferential direction and an air outlet arranged on a lateral side of
the impeller portion together with the side wall portion and the upper plate portion;

at least one of the upper plate portion and the lower plate portion includes an air inlet;
the air channel portion is a space which is located between an outer circumference of the stator and the side wall portion,
extends in the circumferential direction, and reaches an upper surface of the lower plate portion at an axially lower end;

at least a portion of the circuit board is arranged in the air channel portion and on the lower plate portion; and
a plurality of lead wires extending from the stator are connected to the circuit board in the air channel portion.

US Pat. No. 9,109,607

BLOWER FAN

Nidec Corporation, Kyoto...

1. A blower fan comprising:
a shaft;
an impeller arranged to rotate about a rotation axis together with the shaft; and
a motor arranged to rotate the impeller; and
a housing configured to enclose outer circumferences of the impeller and the motor, the housing including a first housing
and a second housing divided from each other in an axial direction to define a cylindrical chamber, each of the first housing
and the second housing including radially inner surfaces which have substantially constant slopes defining the cylindrical
chamber; wherein

the impeller includes a substantially cylindrical impeller cup arranged to rotate together with the shaft, and a plurality
of blades arranged on an outer circumferential surface of the impeller cup;

the motor includes a substantially annular rotor magnet fixed to the shaft, a stator arranged opposite to the rotor magnet,
and a substantially cylindrical stator support portion;

the motor is arranged on an axially lower side of the impeller cup, and the stator of the motor is fixed to an inner circumferential
surface of the stator support portion;

an opening-side end portion of the impeller cup is arranged opposite to an upper surface of the stator support portion;
the upper surface of the stator support portion includes an expanded portion defined at least in a portion thereof which is
axially opposed to the opening-side end portion of the impeller cup, the expanded portion being located a greater distance
from the opening-side end portion of the impeller cup than an axial distance between the opening-side end portion and a remaining
portion of the upper surface of the stator support portion;

the first housing is configured to support the stator support portion and a division position at which the first and second
housings are divided from each other is arranged at an axial level lower than at least that of the opening-side end portion
of the impeller cup; and

the expanded portion of the upper surface of the stator support portion is positioned at a level axially above the stator.

US Pat. No. 9,071,103

COLOR WHEEL DRIVING MOTOR AND DIGITAL-LIGHT-PROCESSING PROJECTOR

NIDEC CORPORATION, Kyoto...

1. A color wheel driving motor, comprising:
a shaft rotatable about a center axis, and the shaft extending along the center axis;
a rotary body including a rotor holder indirectly or directly fixed to the shaft; and
a stationary body including a magnetic position detector mechanism arranged near the rotor holder to detect a rotation position
of the rotor holder,

wherein the motor includes a ring-shaped magnet arranged radially outward of the rotor holder and configured to rotate together
with the rotor holder;

the ring-shaped magnet includes a first end surface and a second end surface arranged along the center axis in a substantially
parallel relationship with each other;

the ring-shaped magnet includes n number of N-pole and n number of S-pole alternately arranged along a circumferential direction
and magnetic pole changeover portions arranged between the N-pole and the S-pole adjoining each other;

the number of the magnetic pole changeover portions is 2n;
the magnetic pole changeover portions adjoining each other are arranged at an angular interval of 360°/2n in the circumferential
direction;

the n is an integer equal to or larger than 1;
on an imaginary plane perpendicular to the center axis, a first straight line passing through the center axis and at least
one of the magnetic pole changeover portions makes a specified angle ? with respect to a second straight line extending from
the center axis toward the ring-shaped magnet, a first mark being arranged in a region of a surface of the ring-shaped magnet
where the second straight line overlaps with the ring-shaped magnet; and the specified angle ? is equal to or larger than
0° and equal to or smaller than 360°/2n.

US Pat. No. 9,812,163

SPINDLE MOTOR INCLUDING SEALING MEMBER AND DISK DRIVE APPARATUS PROVIDED WITH SAME

NIDEC CORPORATION, Kyoto...

15. A disk drive apparatus comprising:
a spindle motor configured to rotate a disk, the spindle motor including:
a bearing mechanism including a shaft having a center axis as a center thereof;
a sealing member on a lower side of the bearing mechanism;
a stationary portion including a base defining a portion of the housing; and
a rotary portion arranged to rotate relative to the stationary portion about the center axis via the bearing mechanism;
an access unit configured to perform at least one of data read from and data write to the disk;
a clamper configured to clamp the disk in conjunction with the spindle motor; and
a housing having a top cover and accommodating the disk, the spindle motor, the access unit, and the clamper, wherein
the base has a through hole defined therein so as to have a center aligned with the center axis and pass through the base
in an axial direction,

the bearing mechanism is fixed to the base in a first fixing region defined between an inner circumferential portion that
defines the through hole in the base and an outer circumferential portion of the bearing mechanism,

the sealing member is fixed to the base in a second fixing region defined between the inner circumferential portion of the
base and an outer circumferential portion of the sealing member, and

at least one of the first fixing region and the second fixing region includes a sealing region where the through hole is closed.

US Pat. No. 9,653,960

MOTOR AND BLOWER

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a shaft which extends along a rotation axis extending in a vertical direction;
a rotor magnet configured to rotate together with the shaft;
a stator located radially outside of the rotor magnet;
a housing including a housing tubular portion which extends along the rotation axis;
a cap located at an axially upper end portion of the housing; and
a bearing portion configured to rotatably support the shaft, and supported by at least one of the housing and the cap; wherein
the stator includes a stator core including an annular core back and a plurality of teeth which project radially inward from
the core back;

the core back includes a tubular outer circumferential surface, the outer circumferential surface including a plurality of
stator contact portions each of which is in contact with the housing tubular portion;

the stator contact portions are spaced from one another in a circumferential direction;
the cap includes:
a cap bottom portion perpendicular or substantially perpendicular to the rotation axis; and
a cap tubular portion extending axially downward from the cap bottom portion;
the cap tubular portion includes a plurality of cap contact portions each of which is in contact with the housing;
the cap contact portions are spaced from one another in the circumferential direction; and
at least one of the cap contact portions is located at a circumferential position different from a circumferential position
of each of the stator contact portions.

US Pat. No. 9,350,207

MOTOR AND METHOD OF MANUFACTURING MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a stationary portion; and
a rotating portion supported to be rotatable with respect to the stationary portion; wherein
the stationary portion includes:
a plurality of teeth arranged to extend radially with a central axis extending in a vertical direction as a center;
an insulator made of a resin and attached to the teeth;
coils each of which is defined by an electric wire wound around the insulator; and
a circuit board arranged below the coils, and including a land portion arranged on a lower surface thereof;
the rotating portion includes a magnet or magnets arranged radially opposite to the teeth;
the insulator includes:
a body portion arranged to cover an upper surface, a lower surface, and circumferential side surfaces of each of the teeth;
and

a wire guide portion arranged to project downward from the body portion;
the electric wire includes a drawn-out portion extending from one of the coils and arranged to reach the land portion arranged
on the lower surface of the circuit board after passing through the wire guide portion;

an area of contact between the drawn-out portion and the wire guide portion is arranged at an axial height lower than that
of the lower surface of the circuit board;

the wire guide portion includes:
a first projecting portion arranged to project downward from the body portion on a radially inner side of the land portion;
and

a flange portion arranged to extend from the first projecting portion radially inward and to both sides in a circumferential
direction;

a lower surface of the flange portion is a guide surface arranged to guide the drawn-out portion; and
the guide surface is arranged at an axial height lower than that of the lower surface of the circuit board and on an upper
side of the drawn-out portion.

US Pat. No. 9,103,330

MOTOR, DISK DRIVE APPARATUS, AND FAN

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a rotating portion; and
a stationary portion arranged to support the rotating portion such that the rotating portion is rotatable about a central
axis; wherein

the rotating portion includes a shaft and a rotor magnet;
the stationary portion includes:
a sleeve including a hole in which the shaft is inserted, and arranged to rotatably support the shaft;
a substantially cylindrical bushing having a bottom arranged to cover the sleeve;
a mounting plate arranged to have the bushing fixed thereto; and
a stator arranged around the bushing radially inside the rotor magnet;
the stator includes a stator core and coils;
the substantially cylindrical bushing includes:
a bushing cylindrical portion that is substantially cylindrical-shaped and arranged to have the sleeve inserted therein; and
a bushing bottom portion arranged to close an axial lower end of the bushing cylindrical portion;
the mounting plate includes:
a fixing cylindrical portion that is substantially cylindrical-shaped and arranged to have an axial lower portion of the bushing
cylindrical portion press fitted thereto;

an annular upper plate portion arranged to extend radially outward from an axial upper portion of the fixing cylindrical portion;
an annular circumferential portion arranged to extend downward from an outer edge of the annular upper plate portion; and
a mounting portion arranged to extend radially outward from axial lower portion of the annular circumferential portion;
an axial lower end of the fixing cylindrical portion of the mounting plate is arranged at an axial level lower than that of
an axial lower end of a bushing press-fit area an inner circumferential surface of the fixing cylindrical portion and an outer
circumferential surface of the bushing cylindrical portion are in contact with each other; and

at least one of an axial lower end of a sleeve fixing area and an axial lower end of a radial gap is arranged at an axial
level higher than that of an axial upper end of the bushing press-fit area, wherein the sleeve fixing area is an area where
an outer circumferential surface of the sleeve and an inner circumferential surface of the bushing cylindrical portion are
in contact with each other, and wherein the radial gap is defined between an inner circumferential surface of the sleeve and
an outer circumferential surface of the shaft such that the sleeve supports the shaft.

US Pat. No. 10,030,671

HEAT MODULE

NIDEC CORPORATION, Kyoto...

1. A heat module comprising:a fan comprising:
a housing comprising an upper plate portion, a side wall portion, a lower plate portion and an air outlet, an entire edge of the upper plate portion consisting of a first part and a second part, an entire edge of the lower plate portion consisting of a third part and a fourth part, the side wall portion extending between the first part and the third part, an inside space formed by surrounding the upper plate portion, the side wall portion and the lower plate portion,
an impeller including a plurality of blades, the impeller rotatable about a central axis of the impeller, the impeller accommodated in the inside space, the central axis perpendicular to the upper plate portion and the lower plate portion; and
a motor for rotating the impeller about the central axis, the motor accommodated in the inside space, the motor supported by the lower plate portion; and
a heat pipe comprising:
a first end region including a first end, the first end region provided in the inside space; and
a second end region including a second end, the second end region provided outside the inside space, the second end opposite to the first end, the second end region arranged to be in thermal contact with a heat source provided outside the inside space; and
a contact portion arranged in the first end region, the contact portion being in contact with one of an upper surface of the lower plate portion and a lower surface of the upper plate portion;
wherein in a plan view which is perpendicular to the central axis, the air outlet is defined by a straight line made of at least one of the second part and the fourth part,
wherein in the plan view, at least a portion of the heat pipe extends at an angle with respect to the straight line of the air outlet,
wherein the heat pipe is arranged to overlap with at least a portion of each of the blades in the plan view,
wherein said one of the upper surface of the lower plate portion and the lower surface of the upper plate portion, being in contact with the contact portion, comprises:
a recessed portion,
a remaining portion, and
a shoulder portion extended between the recessed portion and the remaining portion,
wherein the recessed portion is recessed from the remaining portion, such that the first end region is accommodated in the recessed portion.

US Pat. No. 9,692,270

MOTOR INCLUDING BRACKETS AND FIXING MEMBERS

NIDEC CORPORATION, Kyoto...

1. A motor, comprising:
a shaft arranged along a center axis extending in an up-down direction extending from an axially upper portion of the motor
to an axially lower portion of the motor;

a rotor magnet arranged in an annular shape about the center axis and configured to rotate together with the shaft;
an armature arranged to cover the rotor magnet at the radial outer side thereof;
an upper bracket fixed to an axially upper portion of the armature, the upper bracket holding an upper bearing to rotatably
support the shaft at the radial center thereof; and

a lower bracket fixed to an axial lower portion of the armature, the lower bracket holding a lower bearing to rotatably support
the shaft at the radial center thereof; wherein

the armature includes an annular core-back, a plurality of magnetic pole teeth protruding radially inward from the core-back,
an insulator arranged to cover at least upper surfaces and lower surfaces of the magnetic pole teeth, and a coil defined by
a conductive wire wound around the magnetic pole teeth through the insulator, the insulator including an annular core-back
insulating portion arranged radially outward of the coil and extended axially upward, the upper bracket making direct or indirect
contact with the core-back insulating portion in an axial direction and making contact with the core-back insulating portion
in a radial direction, the upper bracket being fixed to the core-back insulating portion by a plurality of fixing members
positioned radially inward of an outer circumferential surface of the core-back; and

the plurality of fixing members include axially lowermost surfaces which are positioned axially above an axially uppermost
surface of the core-back in the up-down direction extending from the axially upper portion of the motor to the axially lower
portion of the motor.

US Pat. No. 9,685,844

MOTOR AND METHOD OF MANUFACTURING MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a rotor that is supported so as to be able to rotate around an axis of rotation; and
a stator that is formed into a cylindrical shape and having coil groups of plural phases and a connector, the stator comprising
a plurality of split stators,

wherein each of the split stators comprises:
a split core having an arc-shaped core back section configured to connect with an arc-shaped core back section of another
split core and a tooth section which extends toward the inside in a radial direction from the core back section,

an insulator which covers the tooth section and at least a portion of the core back section,
a coil which has a lead-out line that is connected to the connector, and is wound around the tooth section with the insulator
interposed therebetween, and

wherein the insulator has, at a portion which covers an upper surface in an axial direction of the core back section, a first
inner wall which extends in a circumferential direction, a first outer wall which is disposed further to the outside in the
radial direction than the first inner wall and extends in the circumferential direction, and a first void which extends in
the circumferential direction between the first inner wall and the first outer wall,

the first inner wall has a lead-in groove recessed toward the lower side in the axial direction, at an upper surface in the
axial direction,

the stator further has a support ring which is disposed on the upper side in the axial direction of the first void,
the support ring has a bottom portion which extends in the circumferential direction, a second inner wall which extends in
the circumferential direction on an upper surface in the axial direction of the bottom portion, a second outer wall which
is disposed further to the outside in the radial direction than the second inner wall and extends in the circumferential direction,
and a second void which extends in the circumferential direction between the second inner wall and the second outer wall,

a plurality of lead-out lines of different phases is respectively accommodated in the first void and the second void,
the lead-out line which is accommodated in the first void is accommodated in the first void through the lead-in groove from
the coil;

a distance between an inner edge of the bottom portion and the first inner wall is smaller than a wire diameter of the lead-out
line;

wherein the support ring has an intermediate wall between the second outer wall and the second inner wall and further on the
outside in the radial direction than the second void, and a third void which extends in the circumferential direction between
the intermediate wall and the second outer wall,

the lead-out line of a phase different from phases of the lead-out lines accommodated in the first void and the second void
passes through the lead-in groove and the lead-out groove, is led out further to the outside in the radial direction than
the first void along an outside of the second outer wall, and then accommodated in the third void from the outside in the
radial direction; and

the lead-out line which is accommodated in the second void is provided along the second inner wall of the support ring.

US Pat. No. 9,531,307

MOTOR CONTROL METHOD AND MOTOR CONTROL APPARATUS

NIDEC CORPORATION, Kyoto...

1. A method of controlling a motor driven by a three-phase voltage source inverter, the method comprising the steps of:
a) acquiring a rotational speed parameter representing a rotational speed of the motor;
b) after step a), selecting one of a first system and a second system as a switching signal generation system based on a result
of comparing the rotational speed of the motor represented by the rotational speed parameter with a predetermined reference
speed;

c) after step a), calculating phase voltage command values for each of three phases of the motor based on a target rotational
speed and the rotational speed parameter;

d) after steps b) and c), generating switching signals for each of the three phases of the motor by using the selected switching
signal generation system based on the phase voltage command values; and

e) after step d), outputting the switching signals to the inverter; wherein
the first system is a three-phase modulation scheme which calculates duties of the switching signals for each of the three
phases of the motor based on voltage values of the phase voltage command values for each of the three phases of the motor
and a voltage value of a carrier signal;

the second system is a two-phase modulation scheme which, based on the voltage values of the phase voltage command values
for each of the three phases and the voltage value of the carrier signal, selects one of the three phases and fixes the duties
of the switching signals for the selected phase in an ON state or an OFF state, and calculates the duties of the switching
signals for the other two phases; and

in step b), the second system is selected when the rotational speed is higher than the reference speed.

US Pat. No. 9,165,594

SPINDLE MOTOR AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A spindle motor comprising:
a stationary portion including a shaft extending along a central axis extending upward and downward; and
a rotating portion including a rotatable sleeve around the shaft; wherein
the stationary portion further includes:
the shaft;
a circular plate portion that extends from the shaft to a radial direction outer side;
a wall portion that extends upward from an outer edge of the circular plate portion and has a cylindrical or substantially
cylindrical shape; and

a plate portion that surrounds the shaft above the circular plate portion and has an annular or substantially annular shape;
the plate portion includes:
a flat plate portion that extends from an outer circumferential surface of the shaft to the radial direction outer side; and
an annular convex portion that extends downward from an outer edge of the flat plate portion and has an annular or substantially
annular shape;

an upper radial dynamic pressure groove array and a lower radial dynamic pressure groove array are arranged apart from each
other or adjacent to each other in an axial direction on one or both of an inner circumferential surface of the sleeve and
the outer circumferential surface of the shaft;

the sleeve includes:
an annular portion that has an annular or substantially annular shape;
an outer side cylindrical portion that extends upward from an outer edge of an upper surface of the annular portion; and
an inner side cylindrical portion that extends upward from an inner edge of the upper surface of the annular portion;
the annular convex portion includes a plate inclined surface configured such that a distance between the plate inclined surface
and the central axis increases downwardly;

the inner side cylindrical portion includes a sleeve inclined surface configured such that a distance between the sleeve inclined
surface and the central axis decreases upwardly;

the plate inclined surface and the sleeve inclined surface face each other via a gap;
the inner side cylindrical portion and the upper radial dynamic pressure groove array are superimposed in a radial direction;
the upper radial dynamic pressure groove array includes a plurality of upper spiral grooves that is inclined in one direction
with respect to the axial direction and a plurality of lower spiral grooves that is inclined in another direction opposite
to the one direction;

the plurality of upper spiral grooves and the plurality of lower spiral grooves are arranged apart from each other or adjacent
to each other in the axial direction; and

a lower end of the plurality of upper spiral grooves is positioned farther on an upper side than the upper surface of the
annular portion.

US Pat. No. 9,599,123

BLOWER FAN

NIDEC CORPORATION, Kyoto...

1. A blower fan comprising:
an impeller centered on a central axis extending in a vertical direction;
a motor portion arranged to rotate the impeller about the central axis; and
a housing arranged to house the impeller; wherein
the housing includes:
a lower plate portion arranged to cover a lower side of the impeller, and arranged to have the motor portion fixed thereto;
and

a side wall portion arranged to cover a lateral side of the impeller;
the lower plate portion or an upper plate portion arranged to cover an upper side of the impeller includes an air inlet;
the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air channel
portion arranged to surround the impeller;

the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air outlet
on the lateral side of the impeller;

the air outlet is planar and parallel to the central axis, and includes one of an edge of the upper plate portion, a pair
of edges of the side wall portion, and an edge of the lower plate portion that is closest to the central axis;

the side wall portion includes a tongue portion arranged to project between the air outlet and the impeller;
a side surface of the tongue portion includes:
a tongue portion tip arranged to touch a first imaginary plane including the central axis;
a first tongue portion side surface arranged to extend from the tongue portion tip along an outer envelope of the impeller;
and

a second tongue portion side surface arranged to extend from the tongue portion tip toward a side edge, the side edge being
a line of intersection of the air outlet and the side wall portion; and

the second tongue portion side surface is arranged to cross a second imaginary plane including the central axis and touching
the side edge,

wherein a closest proximity position, at which the first tongue portion side surface and the outer envelope are in closest
proximity to each other, is located downstream of a third imaginary plane with respect to a rotation direction of the impeller,
the third imaginary plane including the central axis and touching the second tongue portion side surface between the tongue
portion tip and the side edge.

US Pat. No. 9,340,104

WHEEL UNIT

NIDEC CORPORATION, Kyoto...

1. A wheel unit, comprising:
a motor;
a pinion gear which is fixed to a rotating portion of the motor;
a wheel which includes an annular ground surface and rotates about a final gear support shaft;
a final gear made of a resin, which is fixed to the wheel directly or via another member and is disposed on one side in an
axial direction with respect to the wheel;

a speed reduction mechanism which decelerates rotation of the pinion gear and transmits the rotation to the final gear; and
a gear case which accommodates the pinion gear, the speed reduction mechanism, and the final gear; wherein
a rotation support portion which rotates along with the final gear and the wheel while being supported by the gear case directly
or via another member is provided between the final gear and the wheel;

an outside diameter of the rotation support portion is greater than an outside diameter of the final gear support shaft; and
at least a portion of the final gear is positioned on an inside of a cylindrical or substantially cylindrical area surrounded
by the ground surface.

US Pat. No. 9,065,315

MOTOR AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A motor comprising:
a stationary portion including an armature; and
a rotating portion configured to be rotatable about a central axis extending in a vertical direction; wherein
the rotating portion includes:
a cylindrical or substantially cylindrical magnet including a pole surface positioned radially opposite to the armature;
a yoke including a yoke cylindrical portion positioned radially outside of the magnet; and
a hub including a hub cylindrical portion positioned radially outside of the yoke, and an annular disk mount portion extending
radially outward from an outer circumference of the hub cylindrical portion;

a first radial gap has a greater radial width at a lower axial end thereof than at an upper axial end thereof, the first radial
gap being a radial gap between an outer circumferential surface of the magnet and an inner circumferential surface of the
yoke cylindrical portion;

a second radial gap has a greater radial width at a lower axial end thereof than at an upper axial end thereof, the second
radial gap being a radial gap between an outer circumferential surface of the yoke cylindrical portion and an inner circumferential
surface of the hub cylindrical portion;

the first radial gap includes a tapered gap gradually increasing in radial width with decreasing height from an upper axial
end thereof;

the upper axial end of the tapered gap is located axially above an axial middle portion of the first radial gap;
the first radial gap is filled with an adhesive from at least the upper axial end to the axial middle portion thereof; and
no adhesive is located from at least the lower axial end to an axial middle portion of the second radial gap.

US Pat. No. 10,128,721

MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor, comprising:a motor body portion comprising:
a rotor having a shaft which has a center on a center axis extending in one direction;
a stator enclosing the rotor and structured to rotate the rotor about the center axis;
a first bearing which is disposed at a first side in the one direction of the stator and supports the shaft;
a second bearing which is disposed at a second side opposite to the first side of the stator and supports the shaft; and
a housing having an accommodating space for accommodating the rotor, the stator, the first bearing, and the second bearing;
a connector portion disposed to the motor body portion; and
a wiring member electrically connected to the motor body portion,
wherein the connector portion has an exposed surface which is exposed to an outside of the motor body portion,
the wiring member includes a plurality of external connection terminals which are connected to an external power supply and protrude from the exposed surface of the connector portion,
the connector portion is provided with a through hole which extends from the exposed surface toward the accommodating space and allows the outside of the motor body portion and the accommodating space to be communicated with each other,
when viewing the exposed surface from a normal direction, at least a portion of the through hole is positioned inside an outer edge of an external connection terminal group configured of the plurality of external connection terminals;
a cross-sectional shape of the through hole in a direction orthogonal to a direction in which the through hole extends is different from a cross-sectional shape of the external connection terminal.

US Pat. No. 9,601,958

STATOR PORTION AND MOTOR

NIDEC CORPORATION, Kyoto...

1. A stator portion assembly comprising:
a stator has a central axis extends in a vertical direction; and
a bus bar member disposed on an upper side of the stator; wherein the stator includes:
a core back centered on the central axis;
a plurality of teeth extending toward the central axis from the core back;
and a plurality of coils respectively provided on the plurality of teeth;
the plurality of coils define three coil groups; each of the three coil groups includes two or more coils defined by a single
conducting wire that includes a jumper wire portion;

the bus bar member includes:
three first bus bars, wherein end portions on one side of the conducting wires of the three coil groups are respectively connected
to the three first bus bars, and each of the three first bus bars includes an external connection terminal;

a second bus bar that defines a neutral point, wherein end portions on the other side of the conducting wires of the three
coil groups are connected to the neutral point; and

a resin holder that retains the three first bus bars and the second bus bar;
the external connection terminals of the three first bus bars are disposed in a common area of a circumferential direction
centered on the central axis; and

the three first bus bars and the second bus bar overlap in only one of a radial direction centered on the central axis and
an axial direction, and a maximum number of the three first bus bars and the second bus bar that overlap is 2.

US Pat. No. 9,523,373

FAN

NIDEC CORPORATION, Kyoto...

1. A blower fan comprising:
an impeller including a plurality of blades arranged to rotate about a central axis extending in a vertical direction and
arranged in a circumferential direction, and a blade support portion arranged to support the blades;

a motor portion arranged to rotate the impeller; and
a housing arranged to contain the impeller; wherein
the housing includes:
a lower plate portion arranged to cover a lower side of the impeller, arranged to support the motor portion, and made of a
material having a thermal conductivity of 1.0 W/(m·K) or more; and

a side wall portion arranged to cover a lateral side of the impeller, connected with the lower plate portion, and made of
a material having a thermal conductivity of 1.0 W/(m·K) or more;

a channel joining a space above the impeller and a space between the impeller and the lower plate portion to each other in
the vertical direction is defined between adjacent ones of the blades of the impeller;

an upper plate portion arranged to cover an upper side of the impeller includes an air inlet, the air inlet being a single
air inlet provided in the blower fan;

an air outlet on a lateral side of the impeller, the air outlet defined by edges of the upper plate portion, the side wall
portion and the lower plate portion;

a heat source contact portion for directly contacting a heat source, the heat source contact portion being arranged directly
below the lower plate portion;

the air outlet is a plane parallel to the central axis, and including one of an edge of the upper plate portion, a pair of
edges of the side wall portion, and an edge of the lower plate portion that is the closest to the central axis;

the heat source contact portion and the side wall portion are arranged to at least partially overlap with each other in the
vertical direction; and

the heat source contact portion and the blades are arranged to at least partially overlap with each other in the vertical
direction such that air is sucked from the single air inlet to cool the lower plate portion and is exhausted from the air
outlet in the circumferential direction.

US Pat. No. 9,273,692

CENTRIFUGAL FAN, HOUSING COMPONENT CAST, AND METHOD OF MANUFACTURING HOUSING COMPONENT

NIDEC CORPORATION, Kyoto...

1. A centrifugal fan comprising:
an impeller centered on a central axis extending in a vertical direction;
a motor portion arranged to rotate the impeller about the central axis; and
a housing arranged to contain the impeller and the motor portion; wherein
the housing includes:
an upper plate portion arranged above the impeller;
a lower plate portion arranged below the impeller, and arranged to have the motor portion fixed thereto; and
a side wall portion arranged to cover sides of the impeller, and arranged to define an air outlet together with the upper
and lower plate portions;

the upper plate portion or the lower plate portion includes an air inlet;
the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air channel
portion arranged to surround the impeller;

one of the upper and lower plate portions and the side wall portion together define a single housing component molded by casting;
a portion of the one of the upper and lower plate portions which is along a boundary between the side wall portion and the
one of the upper and lower plate portions defines an increased thickness portion arranged to have an axial thickness greater
than that of a remaining portion of the one of the upper and lower plate portions, the thickness of the increased thickness
portion gradually increasing with increasing distance from the central axis; and

an outer surface of the side wall portion includes a gate mark elongated in a circumferential direction, at least a portion
of an axial range of the gate mark overlapping with an axial range of an inner surface of the increased thickness portion.

US Pat. No. 9,064,529

SPINDLE MOTOR AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A spindle motor and recording disk combination including a through hole at a center thereof and an annular clamper installed
thereon, the spindle motor comprising:
a rotating portion including a rotor hub and a magnet fixed to the rotor hub, and configured to be rotatable about a central
axis extending in a vertical direction; and

a stationary portion including a stator opposite to the magnet with a gap intervening therebetween; wherein
the rotor hub includes:
a flange portion extending radially around the central axis; and
a cylindrical portion extending axially upward from an inner circumferential portion of the flange portion;
the flange portion includes a disk mount surface contacting with at least a portion of a lower surface of the recording disk;
the cylindrical portion includes a first screw portion positioned in an outer circumferential portion of the cylindrical portion;
the clamper includes an annular raised portion configured to be fitted in the through hole of the recording disk;
an inner circumferential portion of the clamper includes a second screw portion configured to be screwed to the first screw
portion;

at least a portion of the second screw portion is positioned in an inner circumferential portion of the annular raised portion;
the first screw portion includes at least one of a screw groove and a screw thread;
the second screw portion includes at least one of a screw groove and a screw thread; and
an axial position of at least a portion of the second screw portion overlaps with an axial position of the recording disk.

US Pat. No. 9,856,913

FLUID DYNAMIC BEARING MANUFACTURING METHOD

NIDEC CORPORATION, Kyoto...

1. A bearing manufacturing method which supplies a lubricating oil stored in an oil tank under a reduced pressure environment
to a bearing inside a chamber connected with the oil tank through piping and a liquid transfer pump, the liquid transfer pump
including a housing defining a channel for the lubricating oil, and a rotor arranged to be magnetically levitated and rotate
without making contact with the housing to generate a pressure which causes the lubricating oil to travel toward the chamber,
the bearing manufacturing method comprising the steps of:
a) arranging the bearing inside the chamber;
b) reducing a pressure inside the chamber to make both a pressure inside the oil tank and the pressure inside the chamber
lower than an atmospheric pressure, and to place the pressure inside the oil tank and the pressure inside the chamber in a
minimal or no pressure difference condition which, if the liquid transfer pump were not provided, would not cause a flow of
the lubricating oil in the piping;

c) after step b), flowing the lubricating oil from the oil tank into the chamber through power of the liquid transfer pump
to inject the lubricating oil into the bearing; and

d) after step c), increasing the pressure inside the chamber.

US Pat. No. 9,595,290

METHOD OF MANUFACTURING FLUID BEARING APPARATUS AND SPINDLE MOTOR INCLUDING PRESS WORKING A CYLINDRICAL INNER SURFACE PROVIDED WITH A PLATING LAYER

Nidec Corporation, Kyoto...

1. A method of manufacturing a fluid bearing apparatus including a plated bearing member, the method comprising the steps
of:
a) plating a metallic base material including a cylindrical base material inner circumferential surface to define a plating
layer on the base material inner circumferential surface; and

b) bringing a contact portion of a pressing member into contact with the plating layer after step a); wherein
at least a portion of the pressing member including the contact portion has a Young's modulus equal to or greater than a Young's
modulus of the base material;

in step b), by bringing the pressing member into contact with the plating layer, a surface of the plating layer is smoothened
without causing plastic deformation of the base material;

every point on the surface of the plating layer is equidistant or substantially equidistant from a central axis;
the pressing member contact portion is a single contact portion, the single contact portion being annular and every point
on the contact portion being equidistant or substantially equidistant from the central axis, or the pressing member includes
a plurality of contact portions, every point on each contact portion being equidistant or substantially equidistant from the
central axis; and

in step b), a difference between a distance from the central axis to the contact portion and a distance from the central axis
to the surface of the plating layer is equal or substantially equal to an average layer thickness of the plating layer or
smaller than the average layer thickness of the plating layer.

US Pat. No. 9,531,243

MOTOR

NIDEC CORPORATION, Kyoto...

1. A brushless DC motor configured to convert an alternating current to a direct current and to generate a torque with resulting
direct current, the motor comprising:
a stationary portion fixed to a frame of an apparatus to be driven by the motor through a support member; and
a rotating portion configured to rotate about a central axis extending in a vertical direction relative to the stationary
portion; wherein

the rotating portion includes:
a shaft extending along the central axis;
a rotor holder including a top plate portion extending around the shaft, and a cylindrical wall portion extending axially
downward from an outer end portion of the top plate portion; and

a magnet fixed to an inner circumferential surface of the wall portion directly or through a yoke;
the stationary portion includes:
a bearing portion configured to rotatably support the shaft;
a housing including a cylindrical bearing holding portion configured to hold the bearing portion;
a plurality of coils arranged in a circumferential direction radially outside the housing and radially inside the magnet;
an attachment portion fixed to each of the housing and the support member either directly or indirectly through another member;
and

a circuit portion electrically connected to the coils;
the circuit portion includes:
a plate-shaped first circuit board located axially below the coils and axially above the attachment portion, and to which
end portions of conducting wires defining the coils are connected;

a plate-shaped second circuit board located axially below the attachment portion, and arranged to have an AC to DC conversion
portion mounted thereon; and

an electrical connection portion configured to electrically connect the first and second circuit boards to each other;
the first circuit board includes a through hole or a cut-out defined therein;
the housing extends in the vertical direction through the through hole or the cut-out;
the second circuit board includes:
a first region axially aligned with the first circuit board;
a second region axially aligned with the through hole or the cut-out; and
a third region which does not axially overlap with any of the first circuit board, the through hole, or the cut-out; and
the support member is fixed to the third region;
the attachment portion includes:
a central portion fixed to the housing; and
a plurality of arm portions, each of which is arranged to extend radially outward from the central portion; and
each arm portion is fixed to the support member.

US Pat. No. 9,252,697

MOTOR CONTROLLER

Nidec Corporation, Kyoto...

1. A motor controller configured to control a switched reluctance motor, the motor controller comprising:
an inverter configured to be connected to a switched reluctance motor;
a torque and flux estimator configured to estimate a torque and a flux generated in the switched reluctance motor as an estimated
torque and an estimated flux, based on output from the inverter and a rotor angle of the switched reluctance motor;

a switching pattern selector configured to select one of a plurality of switching patterns based on comparing a result of
a reference torque and the estimated torque, comparing a result of a reference flux and the estimated flux, and a flux phase
angle, and to perform switching of the inverter in accordance with a selected switching pattern; and

a reference flux calculator configured to obtain the reference flux from a flux trajectory and the rotor angle changing the
flux trajectory in accordance with the reference torque and a rotating speed of the switched reluctance motor, the flux trajectory
indicating a relationship between the rotor angle and the reference flux.

US Pat. No. 10,054,126

CASING AND BLOWER

NIDEC CORPORATION, Kyoto...

1. A casing comprising:a first plate made of a metal;
a support made of a resin, including a screw hole, fixed to the first plate, and extending in a direction away from the first plate; and
a second plate fixed to the support by a screw fitted into the screw hole; wherein
assuming that a direction along a central axis of the screw hole is a central axis direction, a side on which the second plate is located with respect to the first plate is an upper side with respect to the central axis direction, and a side on which the first plate is located with respect to the second plate is a lower side with respect to the central axis direction;
the first plate includes:
a flat plate portion extending perpendicularly or substantially perpendicularly to the central axis direction;
a through hole passing through the flat plate portion; and
a claw portion defined by a freestanding projection extending upward with respect to the central axis direction from a circumferential edge of the flat plate portion which defines the through hole;
the claw portion is defined by a portion of the first plate extending along a direction in which a longest line segment extends inside the through hole in a plan view and being bent upward from the flat plate portion;
a portion of the support is located in the through hole; and
at least a portion of the claw portion projects into the through hole and is embedded within the support.

US Pat. No. 9,991,769

MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor, comprising:a rotary unit which rotates on a vertical center axis, and includes magnets;
a stationary unit which is disposed around the rotary unit; and
a bearing mechanism which rotatably supports the rotary unit relative to the stationary unit,
wherein the stationary unit comprises:
a stator which is disposed around the rotary unit; and
a cover which is electrically conductive, and covers a top surface of the stator,
the stator comprises:
a stator core which includes a plurality of teeth, and a core back; and
a coil which is wound around the stator core via an insulator,
when seen from a top view, the cover includes openings on at least one of circumferential intervals between neighboring teeth, and the cover is connected to a ground potential, and
the coils are wound about the stator core such that a s which extend circumferentially and axially are provided between directly circumferentially adjacent ones of the plurality of teeth, circumferential centers of the openings being provided in the gaps.

US Pat. No. 9,976,570

BLOWER APPARATUS

NIDEC CORPORATION, Kyoto...

1. A blower apparatus comprising:an air blowing portion arranged to rotate about a central axis extending in a vertical direction;
a motor portion arranged to rotate the air blowing portion; and
a housing arranged to house the air blowing portion and the motor portion; wherein
the housing includes:
an air inlet arranged above the air blowing portion, and arranged to pass through a portion of the housing in an axial direction; and
an air outlet arranged to face in a radial direction at at least one circumferential position radially outside of the air blowing portion;
the air blowing portion includes:
a plurality of flat plates arranged in the axial direction with an axial gap defined between adjacent ones of the flat plates; and
a plurality of spacers each of which is arranged in a region in the axial gap between axially adjacent ones of the flat plates, the region covering a portion of a radial extent of the axial gap;
at least one of the flat plates includes an air hole arranged to pass therethrough in the axial direction; and
each air hole is arranged to be in communication with a space radially outside of the air blowing portion through the axial gap.

US Pat. No. 9,964,148

FLUID DYNAMIC BEARING APPARATUS, SPINDLE MOTOR, AND DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A fluid dynamic bearing apparatus comprising:a stationary body;
a rotating body supported to be rotatable with respect to the stationary body; and
a lubricating oil arranged between the stationary body and the rotating body; wherein
one of the stationary body and the rotating body includes:
a shaft arranged along a rotation axis extending in a vertical direction; and
an upper annular portion being annular and arranged around the shaft;
another one of the stationary body and the rotating body includes a sleeve arranged below the upper annular portion, and including an inner circumferential surface arranged opposite to an outer circumferential surface of the shaft with a bearing gap intervening therebetween;
the sleeve includes a communicating hole arranged to pass therethrough in an axial direction or obliquely with respect to the axial direction;
the stationary body or the rotating body includes a groove array arranged in a herringbone pattern or a spiral pattern to generate a flow of the lubricating oil;
the lubricating oil is arranged to fill the bearing gap, the groove array, and the communicating hole;
the groove array is arranged to cause the lubricating oil to flow from the bearing gap into the communicating hole;
the communicating hole includes an inlet through which the lubricating oil flows into the communicating hole, and an outlet through which the lubricating oil flows out of the communicating hole; and
a loss coefficient at the inlet is lower than a loss coefficient at the outlet.

US Pat. No. 9,856,880

MOTOR AND BLOWER

Nidec Corporation, Kyoto...

1. A motor comprising:
a stationary portion;
a rotating portion configured to rotate about a rotation axis extending in a vertical direction; and
a bearing configured to rotatably support the rotating portion; wherein
the stationary portion includes:
a base plate made of a metal; and
a holder made of a resin and extending upward from the base plate;
the base plate includes:
a flat plate portion extending perpendicularly or substantially perpendicularly to the rotation axis;
a through hole passing through the flat plate portion; and
a plurality of claw portions, each of which extends upward from an edge of the flat plate portion which defines the through
hole;

the claw portions are spaced from one another in a circumferential direction;
a portion of the holder is located in the through hole;
the holder covers at least a portion of each claw portion;
the holder includes a gate mark used in an injection molding process;
the gate mark is located near a lower surface of the flat plate portion and at a circumferential position between adjacent
ones of the claw portions which are opposed to one another in the circumferential direction without any other one of the claw
portions provided therebetween; and

none of the claw portions axially overlap any portion of the gate mark.

US Pat. No. 9,739,312

BEARING MECHANISM, SPINDLE MOTOR INCLUDING THE BEARING MECHANISM AND ELECTRONIC EQUIPMENT INCLUDING THE SPINDLE MOTOR

NIDEC CORPORATION, Kyoto...

1. A bearing mechanism comprising:
a stationary portion including a shaft portion extending along a central axis extending upward and downward, and a plate portion
extending to a radial direction outer side from the shaft portion and having an annular or substantially annular shape; and

a rotating portion that includes a sleeve which is rotatable around the shaft portion, wherein
the sleeve includes:
an annular portion that has an annular or a substantially annular shape;
a cylindrical portion that extends from an outer edge of the annular portion toward an upper side;
an annular bottom surface that widens from an inner circumferential surface of the cylindrical portion to a radial direction
inner side; and

a first communication hole that includes an opening which is open to the annular bottom surface, and penetrates the annular
portion in an axial direction,

the rotating portion includes:
a ring member that is arranged to cover at least a portion of the opening of the first communication hole, and faces the plate
portion via a first gap;

an outer circumferential surface of the plate portion faces the inner circumferential surface of the cylindrical portion via
an upper capillary seal portion whose gap in a radial direction is narrowed toward a lower side;

a lubricating oil is interposed in a space between the stationary portion and the rotating portion, which includes:
the upper capillary seal portion;
the first gap;
a second gap between an outer circumferential surface of the shaft and an inner circumferential surface of the sleeve; and
the first communication hole;
a pumping groove array, which is configured to cause the lubricating oil move to a radial direction inner side when the rotating
portion rotates, is disposed in the plate portion or the ring member;

a second communication hole, which is a gap widening in the radial direction and connected to the first communication hole,
is disposed between the ring member and the annular bottom surface; and

at least a portion of an opening of the second communication hole is positioned on the farther radial direction inner side
than the pumping groove array.

US Pat. No. 9,742,239

SPINDLE MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A spindle motor comprising:
a rotor portion including a rotor magnet;
a bearing portion configured to support the rotor portion such that the rotor portion is rotatable about a central axis extending
in a vertical direction;

a base portion made of a metal, and including an upper surface, a lower surface, and a base portion through hole passing therethrough
from the upper surface to the lower surface;

a stator portion located on the upper surface, and including coils arranged opposite to the rotor magnet with a gap intervening
therebetween;

a circuit board located on the lower surface;
an insulation sheet portion;
a first sealant; and
a second sealant; wherein
the coils include a lead wire drawn out from above the upper surface downwardly from the lower surface through the base portion
through hole;

the circuit board includes a land portion to which the lead wire is connected;
the insulation sheet portion is provided on the lower surface, and covers at least a portion of the base portion through hole;
the lead wire contacts the insulation sheet portion;
the first sealant is located in the base portion through hole;
the second sealant covers at least a portion of the base portion through hole; and
the first sealant has a coefficient of linear expansion greater than a coefficient of linear expansion of the base portion
and smaller than a coefficient of linear expansion of the second sealant.

US Pat. No. 9,574,565

CENTRIFUGAL FAN HAVING MAIN BLADE WITH AXIALLY UPPER END PROJECTING UPWARD

NIDEC CORPORATION, (JP)

1. A centrifugal fan comprising:
an impeller arranged to rotate about a rotation axis;
an impeller case arranged to accommodate the impeller;
a motor arranged to rotate the impeller; and
a motor case joined to the impeller case and arranged to accommodate the motor; wherein
the impeller comprises:
a boss portion joined to a shaft arranged to rotate about the rotation axis;
a hub arranged to extend radially outward from an outer circumferential surface of the boss portion; and
a plurality of blades arranged on an upper surface of the hub;
each blade is arranged to extend radially outward away from the rotation axis;
an inner wall of the impeller case is arranged to cover the blades, and comprises an inside surface extending radially outward
along an upper end portion of each blade; and

the impeller case comprises an air inlet defined in a central portion thereof, with a side end portion of the air inlet comprising
a curved surface projecting radially inward;

wherein the curved surface of the air inlet is arranged to have an axial dimension smaller than a radial dimension thereof,
the radial dimension being a dimension in a radial direction from a most radially inner point of the curved surface to a point
where the curved surface extends furthest away from the impeller in an axial direction;

wherein the blades comprise:
a main blade arranged to extend radially outward from a point radially inward of a radially innermost end of the curved surface
of the air inlet; and

an auxiliary blade arranged to extend radially outward from a point radially outward of the radially innermost end of the
curved surface of the air inlet;

the main blade has an axially upper end projecting upward and positioned radially outward of the radially innermost end of
the curved surface of the air inlet;

a distance between the main blade and the inside surface of the impeller case is arranged to be shortest at the axially upper
end of the main blade; and

wherein a plurality of auxiliary blades is equidistantly located between the two adjacent main blades.

US Pat. No. 9,083,224

METHOD OF MANUFACTURING DISK DRIVE APPARATUS

Nidec Corporation, Kyoto...

1. A method of manufacturing a disk drive apparatus, the method comprising the steps of:
preparing a spindle motor including a rotor hub including an outer surface with a hub screw groove and a hub information mark
indicative of a start position of the hub screw groove, and the rotor hub being arranged to rotate about a central axis;

preparing a clamper including a clamper screw groove in an inner circumferential portion thereof;
fitting a recording disk to the spindle motor;
detecting a position of the hub information mark; and
based on the detected position of the hub information mark, positioning each of the clamper and the spindle motor in a circumferential
direction, and screwing the clamper to the spindle motor.

US Pat. No. 9,048,716

MOTOR INCLUDING SPECIFIC MAGNETIC SENSOR ARRANGEMENT

Nidec Corporation, Kyoto...

1. A motor comprising:
a stationary section; and
a rotating section that rotates around a central axis extending up and down, with respect to the stationary section; wherein
the rotating section includes:
a rotor magnet that generates torque between itself and an armature provided on a stationary section side; and
a sensor magnet that is separate from the rotor magnet and includes a magnetic pole surface which faces the rotor magnet in
an axial direction;

the stationary section includes:
a housing that accommodates the rotating section and the armature internally in a radial direction;
a substrate disposed above the sensor magnet;
a magnetic sensor arranged on a lower surface of the substrate to detect a magnitude of a magnetic flux of the sensor magnet;
and

a plate-shaped magnetic member disposed at a position axially overlapping the magnetic sensor on an upper surface of the substrate;
the substrate and the magnetic member are fixed to each other at a plurality of axial fixing positions;
the substrate is fixed to a surface perpendicular or substantially perpendicular to an axial direction of the housing;
a rib extending so as to connect an area of one fixing position and an area of another fixing position is provided on an upper
surface of the magnetic member;

a concave portion is provided at a position corresponding to the rib in a lower surface of the magnetic member; and
the magnetic sensor and the concave portion are disposed at positions which do not overlap each other in the axial direction.

US Pat. No. 10,184,492

AXIAL FLOW FAN

NIDEC CORPORATION, Kyoto...

1. A fan comprising:a motor that rotates about a center axis extending up and down;
an impeller including a plurality of blades extending radially outward, the impeller being fixed to the motor;
a housing that surrounds outer peripheries of the motor and the impeller, the housing including a cylindrical inner circumferential surface,
a plurality of ribs that interconnect the motor and the housing; and
a cover including an outer wall portion disposed radially outward of the housing, wherein
the housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port, and a flow straightening grid disposed in the upper edge,
the flow straightening grid is disposed radially inward of the outer wall portion.

US Pat. No. 9,989,062

FAN MOTOR LEAD WIRE PROTECTION MEMBER

NIDEC CORPORATION, Kyoto...

1. A centrifugal fan motor, comprising:a stationary portion;
a rotary portion; and
an impeller; wherein
the rotary portion is configured to rotate about a center axis with respect to the stationary portion through a bearing mechanism;
the impeller is configured to rotate together with the rotary portion; wherein
the stationary portion includes an armature including a coil positioned around the center axis, a metal base plate arranged below the armature, and a circuit board located above or below the metal base plate and provided with a lead wire electrically connected to the outside;
the metal base plate and the lead wire are isolated from each other by a protection member;
the protection member is made of a resin;
the metal base plate includes an opening extending therethrough along the center axis, the opening being defined by a through hole with a periphery which is completely encompassed by portions of the metal base plate, the lead wire is positioned directly adjacent to the opening, and the protection member is insert molded to encapsulate and cover a portion of the opening;
the stationary portion further includes a bearing holder portion configured to hold the bearing mechanism, the bearing holder portion and the protection member are integral with each other so as to define a single monolithic member;
the protection member includes a concave portion at the opening of the metal base plate, the concave portion opens directly towards a circumferential direction about the center axis; and
the lead wire is positioned between opposed wall surfaces of the opening of the metal base pate which define the concave portion and extends axially inside the concave portion from an uppermost side of the metal base plate to a lowermost side of the metal base plate.

US Pat. No. 9,837,872

MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A motor, comprising:
a stationary unit including a stator, a base, and a flexible wiring substrate board;
a rotary unit including a rotor magnet; and
a bearing mechanism arranged to support the rotary unit so as to rotate with respect to the stationary unit about a center
axis extending in an axial direction; wherein

the stator is positioned radially inward of the rotor magnet;
the base is positioned axially below the stator and the rotor magnet and includes a hole extending therethrough;
the hole is positioned in a region of the base in which the hole is located and defines a part of, the region of the base
has a thickness which varies at different locations within the region of the base;

the flexible wiring substrate board extends completely through the hole and is configured to supply electric power to the
stator;

the flexible wiring substrate board extends beneath both of the rotor magnet and the stator;
the flexible wiring substrate board includes a lead portion located on a radially outward end and a connection portion located
on a radially inward end to the connected to the stator;

the connection portion includes a solder portion arranged on a lower axial surface thereof to cover a portion of a lead wire
extending from a coil of the stator;

the base includes an additional hole defined therein; and
at least a portion of the solder portion is positioned within the additional hole.

US Pat. No. 9,745,987

FAN

NIDEC CORPORATION, Kyoto...

1. A fan comprising:
a stationary portion;
a rotating portion;
a bearing mechanism that supports the rotating portion such that the rotating portion is rotatable with respect to the stationary
portion;

an impeller that rotates about a central axis together with the rotating portion to produce an axial air current; and
a housing; wherein
the stationary portion includes:
a stator;
a base portion that directly or indirectly supports the stator; and
a circuit board;
the rotating portion includes:
a rotor magnet on a radially outer side of the stator;
a rotor holder including a cylindrical magnet holding portion that holds the rotor magnet inside; and
an annular portion that extends radially inward from an upper end portion of the cylindrical magnet holding portion;
the impeller includes:
a cup portion that covers the rotor holder; and
a plurality of blades on an outer circumference of the cup portion; and
the cup portion includes:
a cup cover portion that extends radially outward from the central axis;
a cup cylindrical portion that is cylindrical or substantially cylindrical and extends in an axial direction from an outer
edge portion of the cup cover portion to surround the cylindrical magnet holding portion; and

the housing including a side wall portion that surrounds the blades, the side wall portion including a recessed portion that
is recessed from an edge of the side wall portion on an inlet side of the side wall toward an outlet side of the side wall,
the recessed portion being defined in an uppermost surface of the inlet side of the side wall directly adjacent to an inlet
of the fan; and

an inner surface of the side wall portion includes a groove that extends from the recessed portion toward the outlet side.

US Pat. No. 9,721,608

SPINDLE MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A spindle motor for use in a disk drive apparatus, the spindle motor comprising:
a rotating portion including a rotor magnet, and arranged to rotate about a central axis extending in a vertical direction;
a bearing mechanism arranged to support the rotating portion such that the rotating portion is rotatable about the central
axis;

a stator portion arranged opposite to the rotor magnet;
a housing arranged to accommodate the rotating portion, the bearing mechanism, and the stator portion therein; and
a sealing member; wherein
the housing includes a base portion substantially in a shape of a plate and arranged to extend radially below the rotating
portion;

the base portion includes a first lower surface arranged to face downward, and a through hole arranged to pass through the
base portion in the vertical direction and arranged to have a portion of the bearing mechanism arranged therein;

the sealing member is arranged to cover a lower side of the through hole, and includes at least a metal layer;
the base portion includes an inner circumferential portion arranged to define the through hole;
a fixing region at which the bearing mechanism and the base portion are fixed to each other and at least one sealing region
are defined between an outer circumferential portion of the bearing mechanism and the inner circumferential portion of the
base portion;

at the fixing region, the outer circumferential portion is fixed to the inner circumferential portion;
at each of the at least one sealing region, a radially extending seal gap is defined between the bearing mechanism and an
edge of the through hole; and

the seal gap is arranged to have a sealant arranged therein.

US Pat. No. 9,605,682

BLOWER FAN

NIDEC CORPORATION, Kyoto...

1. A blower fan comprising:
a motor;
an impeller caused by the motor to rotate about a central axis; and
a housing arranged to contain the motor and the impeller; wherein
the motor includes:
a stationary portion;
a bearing apparatus; and
a rotating portion supported by the bearing apparatus to be rotatable with respect to the stationary portion;
the rotating portion includes a rotor holder including a first holder member and a second holder member including an outer
circumferential surface to which the impeller is fixed;

the first holder member includes:
a first thrust portion; and
a rotor cylindrical portion arranged to extend downward from an outer edge portion of the first thrust portion;
the second holder member includes a cover portion including, in an inner edge portion thereof, a cover cylindrical portion
arranged to extend downward;

the rotor cylindrical portion includes an annular rotor raised portion arranged to project radially outward from an outer
circumferential surface thereof;

the second holder member is attached to the first holder member; and
a lower end portion of the cover cylindrical portion is arranged to be in axial contact with the rotor raised portion,
the bearing apparatus includes:
a bearing portion including a bearing housing including a housing cylindrical portion being substantially cylindrical in shape
and centered on the central axis; and

a substantially annular bushing,
an inner circumferential surface of the bushing is fixed to a lower portion of an outer circumferential surface of the bearing
housing through adhesion or press fit;

an inner circumferential surface of the rotor cylindrical portion and an outer circumferential surface of the bearing portion
are arranged to together define a seal gap therebetween, the seal gap including a seal portion having a surface of a lubricating
oil defined therein;

the bushing includes:
a bushing base portion arranged axially opposite a lower end portion of the rotor cylindrical portion; and
a bushing cylindrical portion being substantially cylindrical in shape, and arranged to extend upward from an upper portion
of the bushing base portion;

an inner circumferential surface of the bushing cylindrical portion and the outer circumferential surface of the rotor cylindrical
portion are arranged to together define a vertical gap extending in an axial direction therebetween;

the vertical gap is arranged to have a minimum radial width equal to or smaller than a maximum width of the seal gap,
the bushing cylindrical portion is arranged axially opposite the rotor raised portion; and
a lower end portion of the rotor raised portion and an upper end portion of the bushing cylindrical portion are arranged to
together define a horizontal gap therebetween.

US Pat. No. 9,601,966

INNER-ROTOR MOTOR INCLUDING PRELOAD MEMBER

NIDEC CORPORATION, Kyoto...

1. An inner-rotor motor comprising:
an upper bearing and a lower bearing;
a shaft supported by the upper and lower bearings to be rotatable about a rotation axis extending in a vertical direction;
a rotor magnet directly or indirectly fixed to the shaft;
a stator arranged radially outside and opposite to the rotor magnet with a gap intervening therebetween;
an upper bracket configured to hold the upper bearing; and
a lower bracket configured to hold the lower bearing; wherein
the stator includes a stator core, an insulator, and windings wound around the stator core with the insulator intervening
therebetween;

the upper bracket includes an upper cylindrical cover press fitted to an outer circumference of the stator core from above,
an upper bearing holding portion extending in an axial direction and configured to hold the upper bearing, and a top plate
portion configured to join the upper cylindrical cover and the upper bearing holding portion to each other;

the lower bracket includes a lower cylindrical cover press fitted to the outer circumference of the stator core from below,
a lower bearing holding portion extending in the axial direction and configured to hold the lower bearing, and a bottom plate
portion configured to join the lower cylindrical cover and the lower bearing holding portion to each other;

each of the upper and lower brackets is press fitted to the stator core; and
the inner-rotor motor further comprises a preload member axially adjacent to one of the upper and lower bearings to apply
a preload in accordance with a relative distance between the upper and lower brackets to each of the upper and lower bearings,
wherein each of the upper and lower bearings include an outer race, an inner race, and two or more rolling elements held between
the inner and outer races.

US Pat. No. 9,461,515

MOTOR HAVING WIRING ARRANGEMENT WITH RESPECT TO STATOR INSULATION AND CIRCUIT

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a shaft extending along a central axis extending in a vertical direction, and rotatably supported by a bearing portion;
a rotor magnet configured to rotate together with the shaft;
an armature arranged radially outside the rotor magnet; and
a circuit board held on an axially upper side of the armature, and configured to supply electricity to the armature; wherein
the armature includes:
a stator core including an annular core back and a plurality of magnetic pole teeth arranged to project radially inward from
the core back;

an insulator arranged to cover at least an upper surface and a lower surface of each of the plurality of magnetic pole teeth
of the stator core; and

coils each of which is defined by a conducting wire wound around a separate one of the plurality of magnetic pole teeth with
the insulator intervening therebetween;

the insulator includes at least one protruding portion;
an upper end of each protruding portion is arranged at an axial level higher than an axial level of a lower surface of the
circuit board;

the circuit board includes at least one penetration portion each of which is defined by a cut or a hole, and in each of which
a corresponding one of the at least one protruding portion is arranged;

the conducting wire is drawn out from the armature axially upwardly of the circuit board through at least one of the at least
one penetration portion, and is soldered to a land portion on an upper surface of the circuit board; and

the insulator includes a window portion defined by axially downward cut with a lower end arranged at an axial level lower
than an axial level of the lower surface of the circuit board, the window portion being arranged radially opposite a corresponding
one of the at least one penetration portion.

US Pat. No. 9,429,165

BEARING MECHANISM, MOTOR, AND BLOWER FAN

NIDEC CORPORATION, Kyoto...

1. A bearing mechanism comprising:
a first component portion including a first tubular portion centered on a central axis extending in a vertical direction;
a second component portion including a second tubular portion centered on the central axis, and arranged to be rotatable relative
to the first component portion, an inner circumferential surface of the second tubular portion being arranged radially opposite
an outer circumferential surface of the first tubular portion; and

a lubricating oil; wherein
one of the first and second component portions includes a shaft centered on the central axis, while the other of the first
and second component portions includes a sleeve in which the shaft is inserted;

the lubricating oil is arranged to continuously exist between a portion including the sleeve and a portion including the shaft;
a radial dynamic pressure bearing portion is defined between the shaft and the sleeve, or a thrust dynamic pressure bearing
portion is defined in a thrust gap between an upper surface of the sleeve and a member opposed to the upper surface of the
sleeve;

the outer circumferential surface of the first tubular portion and the inner circumferential surface of the second tubular
portion are arranged to together define a seal gap therebetween, the seal gap including a seal portion in which a surface
of the lubricating oil is located;

a member including the first tubular portion is either a resin-molded article or a metal die-cast article;
the first tubular portion includes, in an area where the outer circumferential surface of the first tubular portion and the
lubricating oil are in contact with each other, a maximum outside diameter portion at which the first tubular portion is arranged
to have a greatest outside diameter, an annular shoulder portion including a surface facing toward the surface of the lubricating
oil and at which the first tubular portion is arranged to have an outside diameter smaller than that of the maximum outside
diameter portion, and an inclined portion at which the outside diameter of the first tubular portion is arranged to gradually
decrease from the annular shoulder portion toward the surface of the lubricating oil; and

the outer circumferential surface of the first tubular portion includes a line joining the maximum outside diameter portion
and the annular shoulder portion to each other.

US Pat. No. 9,047,925

SPINDLE MOTOR, AND DISK DRIVE APPARATUS INCLUDING THE SPINDLE MOTOR

Nidec Corporation, Kyoto...

1. A spindle motor for use in a disk drive apparatus to drive a disk, the disk drive apparatus including a housing defining
an interior space, the spindle motor comprising:
a stationary portion including a shaft arranged to extend in an axial direction;
a base portion arranged to define a portion of the housing, and including a through hole in which the shaft is inserted; and
a rotating portion arranged to rotate about a central axis with respect to the stationary portion through a bearing mechanism;
wherein

the shaft includes:
a non-through hole portion arranged to extend downward from an upper end of the shaft;
a first connection channel arranged to extend from the hole portion in a radial direction to connect the hole portion with
an interior of the bearing mechanism; and

a second connection channel arranged to extend from the hole portion in the radial direction to connect the hole portion with
a space defined on a lower side of the bearing mechanism; and

gas is permitted to pass into the interior space of the housing through the hole portion and the second connection channel
after being fed into the through hole portion from an outside of the housing.

US Pat. No. 9,810,239

ELECTRIC BLOWER

NIDEC CORPORATION, Kyoto...

1. An electric blower comprising:
a centrifugal impeller that rotates about a central axis extending in a vertical direction;
a diffuser including a plurality of stationary vanes located on a radially outer side of the centrifugal impeller;
a motor that drives the centrifugal impeller;
a fan case that covers the centrifugal impeller and the diffuser, and including an inlet port located axially opposite to
a central portion of an upper surface of the centrifugal impeller;

a housing case located radially outside of the motor, and joined to the fan case; and
a plurality of return guide vanes each of which guides air which has been guided by each of the plurality of stationary vanes
of the diffuser to an inner surface of the fan case radially inward through a space under the diffuser; wherein

the housing case includes an annular lower plate portion located axially below the diffuser;
each of the plurality of return guide vanes is continuous with an upper surface of the annular lower plate portion;
an upper end of each of the plurality of return guide vanes is located axially opposite to the diffuser; and
at least a partial portion of each of the plurality of the return guide vanes are axially aligned with the plurality of stationary
vanes in the vertical direction.

US Pat. No. 9,692,273

SPINDLE MOTOR, ELECTRONICS DEVICE AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A spindle motor comprising:
a stationary portion;
a rotating portion configured to rotate about a central axis with respect to the stationary portion; and
a bearing configured to support the rotating portion; wherein
the bearing includes:
a stationary bearing portion fixed to the stationary portion;
a rotatable bearing portion configured to rotate together with the rotating portion;
a seal portion located between a wall surface of the rotatable bearing portion and a wall surface of the stationary bearing
portion;

a lubricating fluid positioned to intervene between the rotatable bearing portion and the stationary bearing portion; and
a liquid surface of the lubricating fluid located in the seal portion;
the rotating portion includes:
a rotor magnet;
a circular or substantially circular plate portion configured to extend around the central axis; and
an annular or substantially annular raised portion configured to project downward from the circular or substantially circular
plate portion;

the stationary portion includes:
a stator arranged opposite to the rotor magnet with a gap intervening therebetween;
a base portion configured to extend around the central axis, and configured to have the stator fixed thereto; and
an annular or substantially annular recessed portion configured to accommodate the raised portion, and including a first side
surface and a second side surface;

the raised portion includes:
an inner circumferential surface positioned radially opposite the first side surface of the recessed portion with a first
minute gap intervening therebetween; and

an outer circumferential surface positioned radially opposite the second side surface of the recessed portion with a second
minute gap intervening therebetween;

the first minute gap is configured to have an axial dimension greater than an axial dimension of the seal portion;
the rotatable bearing portion includes a shaft;
the stationary bearing portion includes a sleeve including a hole configured to accommodate the shaft;
an outer circumferential surface of the sleeve includes:
an upper outer circumferential surface; and
a lower outer circumferential surface configured to project radially outward relative to the upper outer circumferential surface;
the inner circumferential surface of the raised portion includes:
an upper inner circumferential surface positioned radially opposite the upper outer circumferential surface with a third minute
gap intervening therebetween; and

a lower inner circumferential surface positioned radially opposite the lower outer circumferential surface with a fourth minute
gap intervening therebetween; and

the third minute gap is positioned radially inward of the fourth minute gap.

US Pat. No. 9,071,107

ROTOR UNIT, ROTATING ELECTRICAL MACHINE, AND METHOD FOR MANUFACTURING ROTOR UNIT

Nidec Corporation, Kyoto...

1. A rotor unit for a rotating electrical machine comprising:
an annular rotor core including laminated steel sheets that are laminated in a vertical direction;
a plurality of magnets arranged in a circumferential direction around the rotor core; and
a holder made of resin that is arranged to hold the plurality of magnets; wherein
the holder includes a plurality of partitioning portions that extends in the vertical direction along an outer peripheral
surface of the rotor core, and a coupling portion that connects the plurality of partitioning portions;

the rotor core and the holder are made of insert molded material so as to be fixed together;
a portion of resin that defines the holder is present between the plurality of steel sheets that defines the rotor core in
the outer peripheral surface of the rotor core;

one of the plurality of magnets is press-fitted into a pair of the plurality of partitioning portions that are mutually adjacent;
each of the plurality of partitioning portions includes:
a columnar portion located between a pair of the plurality of magnets that are mutually adjacent; and
a wall portion that partially covers a radial outside surface of the pair of the plurality of magnets; and
an inner peripheral surface of the wall portion includes an inclined surface that gradually approaches the outer peripheral
surface of the rotor core as the inclined surface extends downward in the vertical direction from an upper end of the rotor
core in the vertical direction.

US Pat. No. 9,980,549

HAIR DRYER

NIDEC CORPORATION, Kyoto...

1. A hair dryer arranged to send air forward along a central axis extending in a front-rear direction, the hair dryer comprising:a fan motor;
a heater unit; and
a hollow tubular body case arranged to cover the fan motor and the heater unit, and arranged to extend in the front-rear direction around the central axis; wherein
the fan motor includes:
an impeller arranged to rotate about the central axis; and
a motor arranged to rotate the impeller;
the body case includes:
an intake case portion including an air inlet;
a discharge case portion including an air outlet; and
an admission case portion arranged between the air inlet and the air outlet, and including an admission inlet passing therethrough in a direction parallel to the central axis;
the intake case portion includes a tubular suction tube portion arranged to extend forward from a rear end portion thereof toward the admission inlet;
the intake case portion and the admission case portion are arranged to together define an expansion chamber arranged between the admission inlet and the air inlet and radially outside of the suction tube portion and the admission inlet; and
the suction tube portion includes:
a first opening being a rear opening of the suction tube portion; and
a second opening being a front opening of the suction tube portion;
the admission inlet includes, at least in a portion thereof, a slanting portion arranged to gradually increase in an inside diameter in the forward direction; and
the slanting portion is gradually curved radially outward in the forward direction.

US Pat. No. 9,966,809

MOTOR

NIDEC CORPORATION, Kyoto...

1. An electrical rotating machine comprising:a rotor configured to rotate about a central axis and including a cylindrical or substantially cylindrical shape; the rotor including:
a first rotor core;
a second rotor core which overlaps the first rotor core in an axial direction;
a non-magnetic substance layer interposed between the first rotor core and the second rotor core;
a plurality of permanent magnet portions embedded in the first rotor core and the second rotor core; and
an armature disposed radially outside the rotor; wherein
the plurality of permanent magnet portions are arranged at equal or substantially equal intervals in a circumferential direction in each of the first rotor core and the second rotor core;
magnetic poles of radially outer surfaces of every two of the plurality of permanent magnet portions adjacent to each other in the circumferential direction are different from each other;
each of the first rotor core and the second rotor core includes a stage skew structure such that the plurality of the permanent magnet portions in one of the first rotor core and the second rotor core are deviated from the plurality of the permanent magnet portions in another one of the first rotor core and the second rotor core in the circumferential direction;
each of the first rotor core and the second rotor core includes:
a plurality of flux barrier portions magnetically saturated between the magnetic poles of the permanent magnet portions adjacent to each other in the circumferential direction; and
a plurality of effectual magnetic flux portions disposed on a radially outer side of the permanent magnet portions, the plurality of effectual magnetic portions function as a magnetic path between the permanent magnet portions and an outside of the rotor;
the plurality of the flux barrier portions and the plurality of the effectual magnetic flux portions are arranged alternately in the circumferential direction on an outer circumferential surface of each of the first rotor core and the second rotor core;
the flux barrier portion of the first rotor core overlaps both of a portion of the flux barrier portion of the second rotor core and a portion of the effectual magnetic flux portion of the second rotor core, in the axial direction;
the plurality of flux barrier portions include end wall portions that overlap portions of two of the plurality of permanent magnet portions in a radial direction, the two of the plurality of permanent magnet portions being adjacent to each other in the circumferential direction;
the plurality of flux barrier portions include central portions, and shapes of radially outermost surfaces of the central portions are defined by straight lines such that radially outer surfaces of the plurality of effectual magnetic flux portions protrude farther in the radial direction than radially outer surfaces of the plurality of flux barrier portions;
a circumferential width of the radially outer surfaces of each of the plurality of permanent magnets is greater than a circumferential width of each of the plurality of effectual magnetic flux portions; and
each of the plurality of effectual magnetic flux portions includes at least three individual distinct surfaces with a first surface facing radially outward, a second surface connected to one of the plurality of the flux barriers, and a third surface connected to another one of the plurality of flux barriers.

US Pat. No. 9,909,591

BLOWER FAN

NIDEC CORPORATION, Kyoto...

1. A blower fan comprising:
a stationary portion;
a bearing mechanism; and
a rotating portion arranged to rotate about a central axis extending in a vertical direction, and supported through the bearing
mechanism to be rotatable with respect to the stationary portion; and

a housing arranged to accommodate the stationary portion, the bearing mechanism, and the rotating portion, wherein
the stationary portion includes:
a stator; and
a stator holding portion to which the stator is fixed;
the rotating portion includes:
an annular rotor hub portion arranged around the central axis;
a rotor magnet arranged along a circumferential surface of the rotor hub portion, and arranged radially inside the stator;
and

an impeller including a plurality of blades arranged along a circumferential direction of the rotor hub portion, each of said
plurality of blades having a base portion attached to the rotor hub portion and a circumferential edge portion, each of said
plurality of blades extending in a radial direction from the base portion to the circumferential edge portion beyond the stator
such that the circumferential edge portion is projected downward at a portion radially outside the stator; and

an upper end of the stator is arranged at a level lower than that of an upper end of the rotor magnet, the base portion of
the impeller is arranged axially above the rotor magnet and is arranged to extend radially outward, and the blades are arranged
axially above the stator such that the upper end of the stator is directly exposed to an air inlet through the blades,

the housing includes:
a lower plate arranged to cover a lower side of the impeller; and
a side wall portion arranged to cover a lateral side of the impeller; and
an upper plate having the air inlet, the upper plate arranged to cover an upper side of the circumferential edge portion of
the impeller, wherein the base portion is exposed though the air inlet;

the upper plate, the side wall portion, and the lower plate are arranged to together define an air channel portion radially
outside the circumferential edge portion of the impeller;

the upper plate, the side wall portion, and the lower plate are arranged to together define an air outlet provided radially
outside the circumferential edge portion of the impeller, such that air is inhaled from the air inlet, flows in the radial
direction inside the housing, and exhausted from the air outlet in the radial direction,

an axial distance between an upper end edge of the air inlet and an upper end of each blade is arranged to be longer than
an axial distance between a lower end of each blade and the stator,

wherein the stator includes:
an annular core back;
a plurality of teeth arranged to extend radially inward from the core back; and
coils wound on the teeth; and
wherein an inner circumferential surface of the core back is arranged radially outward of all of the rotor hub portion and
a base portion of each blade.

US Pat. No. 9,886,984

BASE UNIT AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A base unit for use in a disk drive apparatus in which a gas having a density lower than that of air is sealed in a housing
space defined by a base member and a cover fixed to each other, the base unit comprising:
the base member, the base member being arranged to support a motor rotatable about a central axis extending in a vertical
direction; and

a connector electrically connected to a wire arranged in the housing space; wherein
the base member includes:
a recessed portion arranged to extend in radial directions and recessed upward from a lower surface of the base member, the
radial directions being directions perpendicular to the vertical direction or directions parallel to these directions; and

a hole portion arranged to pass through the recessed portion in the vertical direction;
the recessed portion includes a recessed portion loop-shaped surface being a loop-shaped surface perpendicular to the vertical
direction;

the connector is arranged on a lower side of the recessed portion to cover the hole portion;
an adhesive is arranged between the connector and the recessed portion;
a minimum value of a gap distance between an outer end of the connector and an inner end of the recessed portion in a radial
direction in which the outer end of the connector and the inner end of the recessed portion are opposed to each other with
the adhesive therebetween is greater than a minimum value of a gap distance between an upper surface of the connector and
the recessed portion loop-shaped surface in the vertical direction, in which the upper surface of the connector and the recessed
portion loop-shaped surface are opposed to each other with the adhesive therebetween; and

the adhesive includes at least one of a class bead and a metal filler.

US Pat. No. 9,800,117

SELF-COOLED MOTOR

NIDEC CORPORATION, Kyoto...

1. A self-cooled motor comprising:
two or more attachment portions;
a shaft supported by a bearing so as to be rotatable about a rotation axis extending in a vertical direction;
a rotor holder including a cylindrical portion and a bottom plate portion, and configured to rotate together with the shaft;
a rotor magnet fixed to an inside of the cylindrical portion of the rotor holder;
a stator located radially inside the rotor magnet;
a housing configured to support the bearing and the stator; and
an impeller including at least one blade and at least one opening provided directly adjacent to the at least one blade, the
at least one blade configured to rotate together with the shaft to generate an air current traveling radially outward, at
least a portion of each blade being located axially below the bottom plate portion of the rotor holder; wherein

the housing includes:
a base portion located axially above the rotor holder;
the two or more attachment portions, each attachment portion being located radially outward of the rotor holder; and
an outlet edge portion located in a lower end of the housing and between adjacent ones of the attachment portions, and configured
to define a main air outlet axially below, the main air outlet being configured to connect a space radially inside the housing
and a space radially outside the housing with each other;

the bottom plate portion of the rotor holder includes a rotor vent hole configured to extend therethrough in an axial direction;
the two or more attachment portions are configured to attach the self-cooled motor to a surface of a high temperature chamber
such that the shaft will extend into the high temperature chamber;

the at least one opening is an axial through hole such that air passes axially downward in the axial direction through the
at least one opening; and

air which has passed inside and through the housing is discharged out through the main air outlet.

US Pat. No. 9,670,932

FAN

NIDEC CORPORATION, Kyoto...

1. A fan comprising:
an impeller;
a motor portion arranged to rotate the impeller about a central axis extending in a vertical direction;
a housing arranged to surround an outer circumference of the impeller; and
a plurality of ribs, each of which is arranged to join the motor portion and the housing to each other; wherein
the impeller includes a plurality of blades arranged to extend radially outward from the central axis;
an upper opening of the housing in the vertical direction is an air inlet, while a lower opening of the housing is an air
outlet;

the housing includes a plurality of decreased thickness portions and a plurality of increased thickness portions arranged
alternately in a circumferential direction extending about the central axis;

a diameter of an inner circumferential surface of the housing is arranged to increase with a decreasing height in the vertical
direction between the air inlet and an axial middle portion of a radially outer edge of each blade of the plurality of blades;

below the axial middle portion of the radially outer edge of each blade of the plurality of blades, the diameter of the inner
circumferential surface of the housing is arranged to increase with the decreasing height in the vertical direction, to be
uniform, or to increase with the decreasing height in the vertical direction while being uniform over at least one area;

a distance between the central axis and the radially outer edge of each blade of the plurality of blades is arranged to increase
from the air inlet toward the air outlet;

the inner circumferential surface of the housing has a minimum radius smaller than a distance between the central axis and
an outermost portion of the radially outer edge of each blade of the plurality of blades;

the housing includes:
an upper housing portion in the vertical direction; and
a lower housing portion in the vertical direction arranged to be in contact with a lower portion in the vertical direction
of the upper housing portion;

at a boundary between the upper and lower housing portions, the inner circumferential surface of the housing has a radius
greater than the distance between the central axis and the outermost portion of the radially outer edge of each blade of the
plurality of blades;

the lower housing portion, the plurality of ribs, and a base portion of the motor portion are defined by a single continuous
monolithic member;

the increased thickness portions include a plurality of component fastening structures defining a fastening structure arranged
to fit the upper and lower housing portions to each other;

the plurality of component fastening structures include:
a plurality of projecting portions arranged in a first housing segment and each arranged to extend toward a second housing
segment, the first and second housing segments corresponding to a respective one of the upper and lower housing portions;
and

a plurality of recessed portions arranged in the second housing segment and each of which is arranged to have a separate one
of the plurality of projecting portions fitted thereinto;

either the first housing segment includes auxiliary projecting portions, each of which is positioned in the increased thickness
portions adjacent to corresponding ones of the plurality of projecting portions, the auxiliary projecting portions are arranged
to extend toward the second housing segment, and the second housing segment includes auxiliary recessed portions, each of
which is arranged to have a separate one of the auxiliary projecting portions fitted thereinto; or the second housing segment
includes auxiliary projecting portions, each of which is positioned in the increased thickness portions adjacent to corresponding
ones of the plurality of projecting portions, the auxiliary projecting portions are arranged to extend toward the first housing
segment, and the first housing segment includes auxiliary recessed portions, each of which is arranged to have a separate
one of the auxiliary projecting portions fitted thereinto; and

in the circumferential direction extending about the central axis when viewed from an air inlet end toward an air outlet end
of the central axis, one of the auxiliary projecting portions is provided on a clockwise side of a corresponding one of the
plurality of projecting portions and all remaining ones of the auxiliary projecting portions are provided on counterclockwise
sides of all remaining corresponding ones of the plurality of projecting portions, every one of the increased thickness portions
includes one of the plurality of projecting portions and one of the auxiliary projecting portions.

US Pat. No. 9,599,122

BLOWER FAN

NIDEC CORPORATION, Kyoto...

1. A blower fan comprising:
an impeller centered on a central axis extending in a vertical direction;
a motor portion arranged to rotate the impeller about the central axis; and
a housing arranged to house the impeller; wherein
the housing includes:
a lower plate portion arranged to cover a lower side of the impeller, and arranged to have the motor portion fixed thereto;
and

a side wall portion arranged to cover a lateral side of the impeller;
the lower plate portion or an upper plate portion arranged to cover an upper side of the impeller includes an air inlet;
the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air channel
portion arranged to surround the impeller;

the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air outlet
on the lateral side of the impeller;

the air outlet is planar and parallel to the central axis, and includes one of an edge of the upper plate portion, a pair
of edges of the side wall portion, and an edge of the lower plate portion that is closest to the central axis;

the side wall portion includes a tongue portion arranged to project between the air outlet and the impeller;
a side surface of the tongue portion includes:
a tongue portion tip arranged to touch a first imaginary plane including the central axis;
a first tongue portion side surface arranged to extend from the tongue portion tip along an outer envelope of the impeller;
and

a second tongue portion side surface arranged to extend from the tongue portion tip toward a side edge, the side edge being
a line of intersection of the air outlet and the side wall portion;

the second tongue portion side surface is arranged to cross a second imaginary plane including the central axis and touching
the side edge; and

a closest proximity position, at which the first tongue portion side surface and the outer envelope are in closest proximity
to each other, is located between the first imaginary plane and a third imaginary plane including the central axis and touching
the second tongue portion side surface between the tongue portion tip and the side edge,

wherein the tongue portion tip is located between the outer envelope and a fourth imaginary plane parallel to the air outlet
and touching the outer envelope.

US Pat. No. 9,520,754

MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A motor, comprising:
a bearing;
a rotary unit connected to the bearing and configured to rotate about a center axis;
a stator including a stator core and at least one coil wound around the stator core;
a thin flat base member; and
a cylindrical holder extending in an axial direction; wherein
the base member includes a first through-hole extending in the axial direction, a peripheral edge portion extending radially
outward from the first through-hole, and a thin portion located radially outward of the peripheral edge portion and having
an axial thickness smaller than an axial thickness of all other portions of the base member the peripheral edge portion;

the holder is located in the first through-hole;
the holder includes a first protrusion portion extending radially outward and located axially above the peripheral edge portion
and a second protrusion portion extending radially outward and located axially below the peripheral edge portion;

the second protrusion portion is located axially above a portion of a lower surface of the base member;
the second protrusion portion is located axially below a lower surface of the thin portion and axially below a lower end surface
of the holder;

the bearing is located inside the holder;
the stator core is located outside the holder and axially above the thin portion such that a portion of the thin portion is
located directly axially below the stator core; and

the second protrusion portion extends in a radial direction, or is deformed in a radial direction, to cover or overlap a lower
surface of the peripheral edge portion.

US Pat. No. 9,502,071

SPINDLE MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A spindle motor, comprising:
a stationary portion; and
a rotary portion rotatably supported so as to rotate about a center axis extending up and down; wherein
the stationary portion includes a metal base member, an armature positioned above the base member, and a circuit substrate
positioned on a lower surface of the base member and electrically connected to coils of the armature;

the rotary portion includes a magnet configured to generate torque between the magnet and the armature;
the base member includes a base through-hole configured to interconnect an upper opening defined at an upper surface side
of the base member and a lower opening defined at a lower surface side of the base member;

an insulating sheet portion, which is different and separate from the circuit substrate or a portion of the circuit substrate,
is disposed at the lower surface side of the base member;

the insulating sheet portion covers at least a portion of the lower opening of the base through-hole;
lead wires extending from the coils extend to the lower surface side of the base member through the base through-hole, the
lead wires extending radially outward along a lower surface of the insulating sheet portion while contacting the insulating
sheet portion, and the lead wires are soldered to land portions of the circuit substrate;

the stationary portion further includes a sealing material covering the lower opening of the base through-hole;
the circuit substrate includes a first region defined by a plurality of layers axially laminated one above another; and
the insulating sheet portion includes a smaller number of layers than the first region.

US Pat. No. 9,074,604

CENTRIFUGAL FAN

Nidec Corporation, Kyoto...

1. A centrifugal fan, comprising:
an upstream side impeller arranged to rotate about a center axis extending in an axial direction;
a downstream side impeller positioned below the upstream side impeller and arranged to rotate about the center axis;
a motor arranged to rotate the upstream side impeller and the downstream side impeller; and
a housing arranged to accommodate the upstream side impeller, the downstream side impeller, and the motor; wherein
the housing includes:
a first intake port through which a gas is drawn from outside;
an exhaust port through which the gas is discharged to the outside; and
a flow path defined within the housing to bring the first intake port and the exhaust port into communication with each other;
the flow path includes a first wind tunnel portion positioned below the upstream side impeller to extend in a circumferential
direction and arranged to receive a gas stream from the upstream side impeller and a second wind tunnel portion positioned
above the downstream side impeller to extend in the circumferential direction and arranged to receive a gas stream from the
downstream side impeller;

the flow path includes:
a first impeller chamber arranged to accommodate the upstream side impeller;
a second impeller chamber arranged to accommodate the downstream side impeller; and
a connecting flow path arranged to interconnect the first impeller chamber and the second impeller chamber;
the first intake port is positioned above the upstream side impeller;
the housing further includes a second intake port arranged between the connecting flow path and the second impeller chamber;
the second intake port is positioned below the downstream side impeller;
the connecting flow path includes an intermediate arc-shaped portion positioned below the first impeller chamber and above
the second impeller chamber, the intermediate arc-shaped portion extends in the circumferential direction; and

the intermediate arc-shaped portion includes an outermost diameter smaller than an outermost diameter of each of the first
impeller chamber and the second impeller chamber.

US Pat. No. 10,566,871

MOTOR AND METHOD OF MANUFACTURING THE SAME

NIDEC CORPORATION, Minam...

1. A motor, comprising:a rotor having a shaft which has its center on a center axis extending in one direction;a stator which surrounds the rotor in the axial circumference, and has a plurality of coils; andbus bars connecting coil ends extending from the coils,wherein the bus bars are formed of a plate shape member bent in a thickness direction, a width direction of the bus bars being identical to an axial direction of the motor, andeach of the bus bars has a main body portion, and a coil end connection portion which extends from the main body portion and grips one of the coil ends at an opening that is open toward one direction within a plane perpendicular to the axial direction,a bus bar holder which supports the bus bar,the main body portion of the bus bar is supported by being sandwiched between a pair of bus bar fixing pieces of the bus bar holder in a thickness direction,the bus bar fixing piece has a axially extending rib, andamong the pair of bus bar fixing pieces, the rib is provided at least to one bus bar fixing piece that is disposed on an opposite side from a direction in which the coil end connection portion of the bus bar is extended.

US Pat. No. 9,957,965

AXIAL FLOW FAN

NIDEC CORPORATION, Kyoto...

1. A fan comprising:a motor part arranged to rotate about a center axis extending up and down;
an impeller including a plurality of blades extending radially outward, the impeller fixed to the motor part;
a housing arranged to surround outer peripheries of the motor part and the impeller, the housing including a cylindrical inner circumferential surface and a cylindrical outer circumferential surface;
a first circuit board positioned radially outward of the outer circumferential surface of the housing and electrically connected to the motor part; and
a plurality of ribs arranged to interconnect the motor part and the housing,
wherein the motor part includes an armature having coils, and a second circuit board electrically connected to the coils and the first circuit board,
the housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port, a flange portion enlarged radially outward from the outer circumferential surface of the housing, and a circuit board fixing portion protruding from the outer circumferential surface of the housing and making contact with the first circuit board, and
the first circuit board is mounted with a plurality of electronic components and is disposed in a spaced apart relationship with the outer circumferential surface of the housing, the first circuit board being positioned radially inward of a radial outer edge of the flange portion and arranged to extend in an axial direction.

US Pat. No. 9,929,620

MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor comprising:a rotating shaft extending in a central axial direction and having one end serving as an output end;
a rotor in which the rotating shaft is fixed;
a stator located on the radially outside of the rotor;
a bracket housing the rotor and the stator;
a control device housing part located on the radially outside of the bracket;
a control device located inside the control device housing part;
a sensor housing part located at an end of the bracket on a side opposite to the output end;
a motor sensor mounted at an end of the rotating shaft on the side opposite to the output end; and
a coupling connector connecting the motor sensor and the control device with each other, wherein
an internal space of the control device housing part and an internal space of the sensor housing part communicate with each other,
the coupling connector is located inside the sensor housing part, and
the sensor housing part has a port which has an opening in the axial direction, and the port and the coupling connector at least partially overlap with each other in the axial direction.

US Pat. No. 9,909,813

HEAT MODULE

NIDEC CORPORATION, Kyoto...

1. A heat module comprising:
a fan; and
a heat pipe having a flat cross section, arranged to be in thermal contact with a heat source at one end, and arranged to
be in thermal contact with the fan at an opposite end; wherein

the fan includes:
an impeller including a plurality of blades arranged in a circumferential direction about a central axis extending in a vertical
direction;

a motor arranged to rotate the impeller; and
a housing arranged to accommodate the impeller and the motor;
the housing includes an air outlet arranged to open radially outwardly, a heat sink including a plurality of fins arranged
along the air outlet, a side wall portion arranged to cover an outer circumference of the impeller, and a fan contact portion
arranged to be in thermal contact with the heat pipe;

the heat pipe includes a flat portion between both widthwise end portions of the heat pipe;
the flat portion includes a recessed portion being recessed toward a center of the heat pipe in a cross section of the heat
pipe perpendicular to a direction in which the heat pipe extends;

the fan contact portion is at least partially made of a metal, is arranged to extend along a direction in which the fins are
arranged, and is arranged to overlap with a portion of the heat sink in a plan view;

a heat receiving portion is arranged between the heat source and the heat pipe, and includes a heat source contact portion
arranged to be in thermal contact with the heat pipe;

in at least a portion of the heat pipe which extends between a portion of the heat pipe which is in thermal contact with the
fan contact portion and a portion of the heat pipe which is in thermal contact with the heat source contact portion, a difference
between a maximum axial height of the heat pipe and a minimum axial height of a portion of the heat pipe where the recessed
portion is defined is smaller than a wall thickness of the recessed portion,

the flat portion of the heat pipe includes a contact surface arranged to be in contact with the fan contact portion or the
heat source contact portion, and a non-contact surface arranged on an axially opposite side with respect to the contact surface;
and

an extent of recess of the recessed portion is greater at the non-contact surface than at the contact surface.

US Pat. No. 9,899,884

MOTOR ARMATURE AND MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor armature of a motor, comprising:
a core including a stack of electromagnetic steel sheets, and a tooth portion extending in a radial direction of the motor;
a conductive wire that is wound around the tooth portion in a circumferential direction; and
two or more first recessed portions extending in the radial direction are respectively located in two opposed surfaces of
the tooth portion of each single one of the electromagnetic steel sheets; wherein

none of the two or more first recessed portions axially penetrate all the way through any of the electromagnetic steel sheets.

US Pat. No. 9,746,202

DRYER

NIDEC CORPORATION, Kyoto...

1. A dryer comprising:
a tubular portion extending in a front-rear direction around a blowing axis that extends in the front-rear direction;
an impeller accommodating portion rearward of the tubular portion and continuous with the tubular portion;
a centrifugal impeller accommodated inside the impeller accommodating portion;
a motor configured to rotate the impeller about a rotation axis which crosses a plane including the blowing axis;
a heater support portion inside the tubular portion; and
a heater supported by the heater support portion inside the tubular portion; wherein
the impeller accommodating portion includes a pair of side surfaces, each of which crosses the rotation axis, and an air inlet
defined in at least one of the side surfaces;

the impeller includes a plurality of annular or substantially annular blades with the rotation axis as a center;
the heater support portion includes a plurality of plate-shaped portions extending in a plurality of directions from the blowing
axis in a cross-section perpendicular or substantially perpendicular to the blowing axis;

a rear edge of each of the plate-shaped portions of the heater support portion with respect to the blowing axis extends in
a direction which crosses radially outer edges of the blades with respect to the rotation axis when viewed along the blowing
axis;

the air inlet is elliptical or substantially elliptical; and
one end of a major axis of the air inlet is forward, with respect to the blowing axis, of a plane including the rotation axis
and perpendicular or substantially perpendicular to the blowing axis, and is closer to the blowing axis on a side of a plane
including the rotation axis and parallel or substantially parallel to the blowing axis.

US Pat. No. 9,667,108

BRUSHLESS MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A brushless motor, comprising:
a stationary unit; and
a rotary unit rotatably supported with respect to the stationary unit,
wherein the stationary unit includes a flat armature arranged to extend in a direction orthogonal to a center axis extending
in an up-down direction and a base member arranged to support the armature,

the rotary unit includes a magnet positioned above the armature, a hub made of a magnetic material and arranged to hold the
magnet, and a rotor yoke made of a magnetic material and provided with a portion positioned below the armature,

the armature includes a plurality of coil patterns arranged along a circumferential direction,
the hub includes a lower surface and a recess portion depressed upward from the lower surface, at least a portion of the magnet
accommodated within the recess portion,

the recess portion includes an inner side surface positioned radially inward of the magnet and an outer side surface positioned
radially outward of the magnet, and

a radial gap exists between a radial inner end surface of the magnet and the inner side surface and/or between a radial outer
end surface of the magnet and the outer side surface.

US Pat. No. 9,564,787

MOTOR INCLUDING HOUSING STRUCTURE WITH THROUGH HOLES

Nidec Corporation, Kyoto...

1. A motor comprising:
a bearing portion;
a shaft extending along a central axis extending in a vertical direction, and rotatably supported by the bearing portion;
a rotor magnet configured to rotate together with the shaft;
an armature located radially outside the rotor magnet;
a circuit board held on an axially lower side of the armature, and configured to supply electricity to the armature;
a bracket including a bottom portion and a cover portion both configured to support the bearing portion, and a cylindrical
portion extending downward from a radially outer edge of the cover portion, and including an inner circumferential surface
supported by the armature; and

an impeller including a plurality of blades arranged in a circumferential direction, and fixed to the shaft between the cover
portion and the armature; wherein

the cover portion includes at least one cover portion through hole arranged to axially overlap with the blades, the at least
one cover portion through hole defining an inlet permitting air to enter into the motor;

the bottom portion includes at least one bottom portion through hole defining a first outlet permitting air to exit the motor;
the cylindrical portion includes at least one cylindrical portion through hole arranged to radially overlap with the blades,
the at least one cylindrical portion through hole defining a second outlet permitting air to exit the motor;

each blade is a pitched blade including an upper edge and a lower edge arranged at different circumferential positions;
the circuit board includes portions directly opposed to a rotor core which supports the rotor magnet without any intervening
member being provided between the circuit board and the rotor core; and

the circuit board includes three equidistant projections which connect the circuit board to an insulator of the armature at
three points.

US Pat. No. 9,431,862

MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor comprising: an armature;
a commutator that includes a plurality of segments;
a shaft that is rotated around a central axis along with the armature and the commutator;
a magnet that is disposed around the armature and in which an N pole and an S pole are alternatively arranged in a circumferential
direction;

a brush that is disposed around the commutator and makes sliding contact with the plurality of segments; and
a winding structure that is disposed over the armature and the commutator;
wherein the armature includes a plurality of coils, and an armature core that is fixed to the shaft;
the armature core includes a plurality of teeth that are radially extended in a radial direction, and a plurality of slots
that are disposed between the plurality of teeth and extended in an axial direction;

the winding structure includes a coil winding wire that defines the coil, a leader line that is connected between the coil
and the plurality of segments, a connecting wire that is connected between two coils, and an equalizer that is connected between
two segments of the plurality of segments;

the equalizer includes a going portion and a return portion which are wound across groups of the plurality of teeth through
the plurality of slots, and connects a hook portion of two identical segments of the plurality of segments; and

when an expansion value is an integer among values which are integer multiples of a value which is acquired by dividing a
total number of the slots by a total number of pole pairs defined by the N pole and the S pole, and when one group of the
plurality of teeth continuously arranged in the circumferential direction and includes a same number of the plurality of teeth
as the expansion value is given as an element teeth group, the plurality of teeth forming a plurality of element teeth groups,
the going portion and the return portion are wound across the element teeth groups through ones of the plurality of slots
positioned at both sides of the element teeth groups;

the element teeth group covered by the going portion is different from the element teeth group covered by the return potion;
and

the coil winding wire, the leader line, the connecting wire, and the equalizer are all portions of a single continuous conducting
wire.

US Pat. No. 9,231,454

MOTOR PROVIDED WITH A PRINTED CIRCUIT BOARD

NIDEC CORPORATION, Kyoto...

1. A motor, comprising:
a stationary unit;
a rotary unit arranged to rotate with respect to the stationary unit about a center axis extending up and down; and
a bearing unit,
wherein the stationary unit includes a stator, a PCB and a base member,
the stator includes a stator core and coils defined by conductive wires wound around the stator core, the stator arranged
radially outward of the bearing unit,

the PCB includes a plurality of through-hole portions extending along the center axis, a plurality of land portions arranged
on a lower surface of the PCB and a PCB fixing portion arranged to fix the PCB to the base member, the PCB arranged below
the stator,

the base member includes a stator holding portion arranged to hold the stator and a bearing holding portion arranged to hold
the bearing unit,

the rotary unit includes a shaft and a magnet,
the shaft is positioned radially inward of the bearing unit and is rotatably supported by the bearing unit to rotate with
respect to the stationary unit about the center axis,

the magnet is opposed to a circumferential surface of the stator core,
the through-hole portions are arranged along a circumferential direction of the PCB around the center axis,
at least a portion of the PCB axially overlaps with the bearing unit,
the PCB fixing portion is arranged radially outward of the through-hole portions, and
lead wires led out from the coils are arranged to pass through the through-hole portions and are soldered to the land portions.

US Pat. No. 10,047,755

FAN

NIDEC CORPORATION, Kyoto...

1. A fan comprising:a stationary portion including a stator having coils;
a bearing mechanism; and
a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion;
wherein the rotating portion includes:
a rotor portion including a shaft; and
an impeller including a plurality of blades and an annular impeller cup arranged to support the blades, the annular impeller cup having an innermost surface extending axially and located radially inside the stator;
wherein the rotor portion is in a shape of a covered cylinder, the rotor portion comprising: a cover portion radially outward extending from the shaft, and a cylindrical portion downward extending from the cover portion, thereby forming a space radially extending between the shaft and the cylindrical portion;
wherein the impeller is fixed to the rotor portion such that an entire circumference of an outer circumferential surface of the cylindrical portion of the rotor portion is press-fitted with the innermost surface of the annular impeller cup;
wherein at least one of the outer circumferential surface of the cylindrical portion and the inner circumferential surface of the impeller cup includes a groove portion recessed radially from the innermost surface;
wherein the groove portion includes an upward facing surface; and
wherein an adhesive is arranged in the groove portion,
wherein a seal portion of the bearing mechanism is arranged in the space radially inward of the innermost surface.

US Pat. No. 9,997,842

SLOT ARRAY ANTENNA

NIDEC CORPORATION, Kyoto...

1. A slot array antenna comprising:a first electrically conductive member having a first electrically conductive surface and a plurality of slots therein, the plurality of slots being arrayed in a first direction which extends along the first electrically conductive surface;
a waveguide member having an electrically conductive waveguide face which opposes the plurality of slots and extends along the first direction;
a second electrically conductive member having a second electrically conductive surface opposing the first electrically conductive surface of the first electrically conductive member; and
an artificial magnetic conductor extending on both sides of the waveguide member, wherein,
the waveguide member is a ridge on the second electrically conductive member;
an upper face of the ridge is the waveguide face, and opposes, via a gap, the first electrically conductive surface;
at least one of the first electrically conductive member and the waveguide member includes a plurality of dents on the first electrically conductive surface and/or the waveguide face, the plurality of dents each serving to broaden a spacing between the first electrically conductive surface and the waveguide face relative to any adjacent site;
the plurality of dents include a first dent, a second dent, and a third dent which are adjacent to one another and consecutively follow along the first direction;
as viewed from a normal direction of the first electrically conductive surface, the first to third dents are located between two endmost slots among the plurality of slots; and
a distance between centers of the first dent and the second dent is different from a distance between centers of the second dent and the third dent.

US Pat. No. 9,964,123

AXIAL FAN HAVING BALANCE CORRECTION PORTIONS AND A CONE LOCATED AXIAL OF ONE OF THE BALANCE CORRECTION PORTIONS

NIDEC CORPORATION, Kyoto...

1. An axial fan comprising:a stationary portion; and
a rotating portion supported to be rotatable with respect to the stationary portion; wherein
the rotating portion includes:
a shaft positioned along a central axis extending from an inlet of the axial fan to an outlet of the axial fan;
a rotor magnet provided in an annular shape around the central axis;
a rotor holder including a cylindrical inside surface configured to hold the rotor magnet; and
an impeller directly or indirectly fixed to an outer circumferential surface of the rotor holder;
the stationary portion includes:
an armature located radially inside of the rotor magnet;
a bearing member configured to rotatably support the shaft;
a base portion configured to support the bearing member and the armature;
a tubular housing extending in an axial direction radially outside of the impeller; and
a plurality of support ribs, each of which is configured to join the housing and the base portion to each other, the plurality of support ribs is located upstream of the impeller in the axial direction;
the impeller includes:
a cup-shaped blade support portion configured to cover the rotor holder; and
a plurality of blades arranged in a circumferential direction radially outside of the blade support portion to generate a downward air flow, downward being from the inlet of the axial fan to the outlet of the axial fan, in the axial direction during rotation;
the rotating portion includes a first balance correction portion located between the blade support portion and the rotor holder in a radial direction, and configured to allow a change in a circumferential mass distribution; and
the impeller includes:
a second balance correction portion which is: located below the first balance correction portion in the axial direction, located below the rotor holder and a junction of each blade with the blade support portion in the axial direction, and configured to allow a change in a circumferential mass distribution;
a first cone portion located below the second balance correction portion in the axial direction and decreasing in diameter with a height decreasing downward in the axial direction; and
a second cone portion decreasing in diameter with a height decreasing downward in the axial direction which is located above the second balance correction portion in the axial direction and below the junction of each blade with the blade support portion in the axial direction.

US Pat. No. 9,951,788

IMPELLER AND BLOWER

NIDEC CORPORATION, Kyoto...

1. An impeller arranged to rotate about a central axis, the impeller comprising:a disk-shaped portion arranged to extend radially with respect to the central axis; and
a plurality of rotor blades arranged along a circumferential direction on one surface of the disk-shaped portion, each rotor blade having one end arranged at an outer edge portion of the disk-shaped portion, and an opposite end arranged radially inward of the outer edge portion of the disk-shaped portion; wherein
the rotor blades include a plurality of first rotor blades each of which includes a first curvature portion and a plurality of second curvature portions;
a center of a radius of curvature of the first curvature portion of each first rotor blade is arranged on a first side of the first rotor blade with respect to the circumferential direction;
a center of a radius of curvature of each second curvature portion of each first rotor blade is arranged on a second side of the first rotor blade with respect to the circumferential direction;
the first curvature portion is arranged radially inward of each second curvature portion;
regarding directly adjacent and contacting ones of the second curvature portions of each first rotor blade, the radius of curvature of the second curvature portion arranged radially outward is greater than the radius of curvature of the second curvature portion arranged radially inward; and
at least a portion of a first virtual line segment connecting a radially inner end point of the second curvature portion arranged radially outward with a center of a radius of curvature at the radially inner end point overlaps a second virtual line segment connecting a radially outer end point of the second curvature portion arranged radially inward with a center of a radius of curvature of the second curvature portion arranged radially inward at the radially outer end point.

US Pat. No. 9,935,528

SPINDLE MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A spindle motor comprising:a rotor portion including a rotor magnet;
a bearing portion configured to support the rotor portion such that the rotor portion is rotatable about a central axis extending in a vertical direction;
a stator portion including coils located opposite to the rotor magnet;
a base portion including an upper surface, a lower surface, and a base portion through hole passing therethrough from the upper surface to the lower surface;
a circuit board located on the lower surface of the base portion; and
an insulation sheet portion; wherein
the coils include a lead wire drawn out from above the upper surface downwardly from the lower surface through the base portion through hole;
the circuit board includes a land portion to which the lead wire is connected;
the insulation sheet portion covers at least a portion of the base portion through hole;
the lead wire contacts the insulation sheet portion; and
the insulation sheet portion has a thickness greater than a thickness of the land portion.

US Pat. No. 9,722,524

MOTOR CONTROLLER

NIDEC CORPORATION, Kyoto...

1. A motor controller that controls a permanent magnet motor, the motor controller comprising:
an inverter connected to the permanent magnet motor; and
a sensor that detects a rotor angle of the permanent magnet motor; wherein
the motor controller estimates or measures torque and flux generated in the permanent magnet motor as calculated torque and
calculated flux, based on an output from the inverter and the rotor angle of the permanent magnet motor;

the motor controller inputs a signal to the inverter to select one of a plurality of switching patterns based on a comparison
result of a reference torque and the calculated torque, a comparison result of a reference flux and the calculated flux, and
a flux phase angle; and

the motor controller compares a highest phase flux out of three phase fluxes with a flux limit and reduce the reference flux
when the highest phase flux is higher than the flux limit.

US Pat. No. 9,553,490

MOTOR

Nidec Corporation, Kyoto...

1. A motor, comprising:
a rotary portion configured to rotate about a center axis extending in an up-down direction; and
a stationary portion configured to support the rotary portion; wherein
the rotary portion includes a shaft extending along the center axis, a rotor holder configured to rotate together with the
shaft, and a rotor magnet held in the rotor holder,

the stationary portion includes a bearing member configured to rotatably support the shaft, a housing configured to hold the
bearing member, a stator held in the housing and radially opposed to the rotor magnet, a circuit board directly or indirectly
held in the housing, positioned axially below the rotor holder and electrically connected to the stator, and a circuit board
support portion defined together with the housing as a single monolithic member or directly or indirectly held in the housing,
directly or indirectly attached to a device body and configured to axially support the circuit board;

the circuit board includes a first circuit board positioned axially above the circuit board support portion and a second circuit
board positioned axially below the circuit board support portion;

the first circuit board and the second circuit board are electrically connected to each other via a connecting member;
the first circuit board and the second circuit board at least partially overlap with each other in an axial direction;
an attachment portion configured to attach the motor to a device is positioned on an outer peripheral surface of the circuit
board support portion; and

the attachment portion includes two or more attachment portions distributed along a circumferential direction evenly or substantially
evenly, and the attachment portion is provided directly axially between the first circuit board and the second circuit board.

US Pat. No. 9,531,222

STATOR CORE HAVING CONVEX PROTRUDING PORTION COINCIDING WITH ADJACENT COILS

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a stationary portion; and
a rotating portion supported to be rotatable about a central axis with respect to the stationary portion; wherein
the stationary portion includes:
a stator core including a core back having an annular shape, and a plurality of teeth extending radially inward from the core
back;

insulators, each of which is attached to a separate one of the teeth; and
coils, each of which is defined by a conducting wire wound around a separate one of the insulators;
a radially inner end portion of each tooth is arranged to have a circumferential width substantially equal to or smaller than
a circumferential width of a remaining portion of the tooth;

the core back includes, between adjacent ones of the teeth:
a protruding portion that protrudes radially inward;
a cut that extends radially outward from the protruding portion; and
a through hole that extends in an axial direction through the core back, and is defined at a radially outer end portion of
the cut;

the protruding portion is arranged to locally increase a radial dimension of the core back;
the core back includes circular or substantially circular arc portions, each of which is arranged between the protruding portion
and a separate one of the teeth adjacent to the protruding portion;

an inner circumferential surface of the through hole includes:
a first curved surface having a center of curvature in the through hole; and
a second curved surface arranged radially inward of the first curved surface, and having a center of curvature outside of
the through hole;

the core back includes a circumferentially continuous joint portion arranged on a radially outer side of the through hole;
and

Dc+Dd?Da?Db/2

where Da is a radial dimension of the protruding portion, Db is a radial dimension of the circular arc portion, Dc is a radial
dimension of the first curved surface Dd, and is a radial dimension of the joint portion.

US Pat. No. 9,995,313

CEILING FAN BLADE

NIDEC CORPORATION, Kyoto...

1. A ceiling fan blade rotated by a motor unit having a center axis extending in an up-down direction, comprising:a blade body extending in a radial direction and including a first slit opened at a rear edge of the blade body in a rotation direction, wherein
on a circumferential cross section including a front end of the first slit of the blade body in the rotation direction, a lower end of a front edge of the blade body in the rotation direction is positioned at an upper side of a lower end of the front end of the first slit in the up-down direction, and
a lower end of an open end of a radial outer edge of the first slit is positioned axially downward from the lower end of the front end of the first slit and is positioned axially upward from a lower end of an open end of a radial inner edge of the first slit.

US Pat. No. 9,916,855

SPINDLE MOTOR

NIDEC CORPORATION, Kyoto...

1. A spindle motor used in a disk drive apparatus to drive a disk, the disk drive apparatus including a housing defining an
interior space, the spindle motor comprising:
a bearing mechanism including a shaft having a central axis as a center thereof;
a stationary portion including a base portion including a through hole in which the shaft is fitted, the base portion defining
a portion of the housing; and

a rotating portion arranged to rotate about the central axis with respect to the stationary portion through the bearing mechanism;
wherein

the bearing mechanism includes a bearing portion in which an outer circumferential surface of the stationary portion and an
inner circumferential surface of the rotating portion are arranged opposite to each other with a fluid therebetween;

the bearing portion includes:
an upper dynamic pressure portion and a lower dynamic pressure portion each of which includes the fluid and is arranged to
generate a fluid dynamic pressure through rotation of the rotating portion; and

an intra-bearing space defined between a lower surface of the fluid in the upper dynamic pressure portion and an upper surface
of the fluid in the lower dynamic pressure portion, and not including the fluid;

the shaft includes an airway defined therein;
the airway includes:
an inner opening defined in a side surface of the shaft, and arranged to be in communication with the intra-bearing space;
and

an outer opening defined in the side surface of the shaft, and arranged to be in communication with an extra-bearing space
defined above or below the bearing mechanism in the interior space;

the airway has no other openings than the inner and outer openings;
the extra-bearing space and the intra-bearing space are arranged to be in communication with each other through the airway;
and

the airway is arranged to extend substantially in a straight line or lines to join the inner and outer openings to each other,
and is angled with respect to the central axis.

US Pat. No. 9,893,577

MOTOR INCLUDING PERMANENT MAGNET ROTOR WITH FLUX BARRIER

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a rotating portion that rotates about a center axis;
a stationary portion positioned around the rotating portion; and
a bearing mechanism that rotatably supports the rotating portion; wherein
the rotating portion includes:
a plurality of magnets that are disposed in a circumferential direction; and
a rotor core that includes a plurality of holding holes extending in an axial direction and holds the plurality of magnets
in the plurality of holding holes, respectively;

each of the plurality of magnets includes a first magnet element and two second magnet elements;
the first magnet element has a circumferentially extensive plate-shaped configuration;
the two second magnet elements are located on opposite circumferential sides of the first magnet element, and a coercivity
of the two second magnet elements is smaller than a coercivity of the first magnet element;

the rotor core includes a flux barrier including a void located on a radially inner side of each of the first magnet elements
and that is sandwiched between a wall surface on the radially inner side and a wall surface on a radially outer side;

a width of each of the magnets including the first magnet elements in a first direction perpendicular or substantially perpendicular
to a radial direction passing through a center of the corresponding first magnet element is larger than a width in the first
direction of the corresponding flux barrier within a plane perpendicular or substantially perpendicular to the center axis;
and

each of the flux barriers includes two end portions, both of the two end portions of each of the flux barriers include extension
portions which respectively extend radially outward toward both an outer circumference of the rotor core and boundaries directly
between the first magnet element and the two second magnet elements within the plane perpendicular or substantially perpendicular
to the center axis, the first magnet element and the two second magnet elements being located radially outward from the flux
barriers and entireties of the extension portions being radially inward from the first magnet element and the two second magnet
elements.

US Pat. No. 9,344,023

MOTOR DEVICE

NIDEC CORPORATION, (JP)

1. A motor device, comprising:
a motor unit comprising:
an inverter circuit;
an inverter drive circuit;
a brushless DC motor comprising a rotor and a stator;
a first shunt resistor connected to the inverter circuit;
a first motor unit input terminal connected to the inverter drive circuit;
a second motor unit input terminal connected to the inverter circuit;
a third motor unit input terminal connected to the inverter drive circuit;
a first motor unit output terminal connected to the inverter drive circuit; and
a first ground terminal connected to the inverter circuit;
a converter unit comprising:
a case;
a AC/DC converter structured to convert an AC voltage to a DC voltage to be supplied to the motor unit;
a microcomputer structured to receive a digital control signal and output an analog control signal;
a first converter unit output terminal structured to output the analog control signal;
a second converter unit output terminal structured to output the DC voltage to be supplied to the inverter circuit;
a third converter unit output terminal structured to output the DC voltage to be supplied to the inverter drive circuit;
a first converter unit input terminal structured to receive the position detection signal;
a second shunt resistor connected to the first shunt resistor and the microcomputer; and
a second grounding terminal;
wherein the AC/DC converter and the microcomputer are provided within the case;
wherein the case of converter unit is connected to the motor unit at the installation surface of the motor unit;
the first motor unit input terminal and the first converter unit output terminal are connected;
the second motor unit input terminal and the second converter unit output terminal are connected;
the third motor unit input terminal and the third converter unit output terminal are connected;
the first motor unit output terminal and the first converter unit input terminal are connected;
the first grounding terminal and the second grounding terminal are connected;
the inverter drive circuit is structured to receive the analog control signal outputted from the microcomputer and output
a drive pulse signal to be supplied to the inverter circuit; and

wherein the microcomputer is configured to detect a terminal voltage across the second shunt resistor, to calculate a current
value by using the terminal voltage and a resistance value of the second shunt resistor, to compare the current value with
a specified current value, and to limit or cut off the output of the analog control signal when the current value exceeds
the specified current value.

US Pat. No. 9,341,214

SLEEVE, FLUID DYNAMIC PRESSURE BEARING INCLUDING THE SLEEVE, SPINDLE MOTOR INCLUDING THE FLUID DYNAMIC PRESSURE BEARING AND ELECTRONIC EQUIPMENT INCLUDING THE SPINDLE MOTOR

NIDEC CORPORATION, Kyoto...

1. A porous oil-impregnated sleeve that is used for a fluid dynamic pressure bearing and extends around a central axis, the
porous oil-impregnated sleeve comprising:
an outer surface;
an inner surface for inserting a shaft, the inner surface opposite to the outer surface, the shaft extending in an axial direction
having a central axis;

a first axial end face that is positioned on a first side in the axial direction;
a second axial end face on a second side opposite to the first side in the axial direction;
a first recessed portion connecting the inner surface with the first axial end face; and
a first dynamic pressure generating groove having a first bottom portion, the first dynamic pressure generating groove positioned
on the first axial end face,

wherein the sleeve is filled with a lubricant,
wherein the first recessed portion is recessed from a line segment connecting an end portion of the inner surface with an
inner end portion of the first axial end face, in a cross-section along the central axis, and

wherein the first recessed portion has a second bottom portion farthest away from the line segment, and
wherein the second bottom portion is closer to the second side than the first bottom portion of the first dynamic pressure
generating groove.

US Pat. No. 10,090,600

WAVEGUIDE DEVICE, AND ANTENNA DEVICE INCLUDING THE WAVEGUIDE DEVICE

NIDEC CORPORATION, Kyoto...

1. A waveguide device comprising:an electrically conductive member having an electrically conductive surface;
a waveguide member having an electrically-conductive waveguide face that opposes the electrically conductive surface and an electrically-conductive side face that connects to the waveguide face, the waveguide member extending so as to face along the electrically conductive surface; and
stretches of artificial magnetic conductor on both sides of the waveguide member, wherein,
the waveguide member includes
a first portion extending in one direction and
at least two branches extending from one end of the first portion, the at least two branches including a second portion and a third portion that extend in mutually different directions;
the second portion has a recess in a side face connecting to a side face of the first portion, the recess reaching the waveguide face; and,
as viewed from a direction perpendicular to the waveguide face, a distance from a point of intersection between the side face of the first portion and the side face of the second portion to a center of the recess is shorter than a length of the recess along a direction that the second portion extends.

US Pat. No. 10,042,045

WAVEGUIDE DEVICE, SLOT ARRAY ANTENNA, AND RADAR, RADAR SYSTEM, AND WIRELESS COMMUNICATION SYSTEM INCLUDING THE SLOT ARRAY ANTENNA

NIDEC CORPORATION, Kyoto...

1. A waveguide device comprising:an electrically conductive member having an electrically conductive surface;
a waveguide member having an electrically-conductive waveguide face of a stripe shape opposing the electrically conductive surface, the waveguide member extending along the electrically conductive surface; and
an artificial magnetic conductor extending on both sides of the waveguide member, wherein,
the waveguide member has a bend at which a direction that the waveguide member extends changes;
a waveguide which is defined by the electrically conductive surface, the waveguide face, and the artificial magnetic conductor includes a gap enlargement where a gap between the electrically conductive surface and the waveguide face is locally increased; and
in a plan view projected along a direction perpendicular to the electrically conductive surface, at least a portion of the bend has an overlap with the gap enlargement.

US Pat. No. 10,020,589

WAVEGUIDE DEVICE, SLOT ANTENNA, AND RADAR, RADAR SYSTEM, AND WIRELESS COMMUNICATION SYSTEM INCLUDING THE SLOT ANTENNA

NIDEC CORPORATION, Kyoto...

1. A waveguide device comprising:a first electrically conductive member having a first electrically conductive surface;
a second electrically conductive member having a second electrically conductive surface which opposes the first electrically conductive surface; and
a ridge-shaped waveguide member on the second electrically conductive member, the waveguide member having an electrically conductive waveguide face which extends along the first electrically conductive surface so as to oppose the first electrically conductive surface,wherein,the second electrically conductive member has a throughhole;
the waveguide member is split by the throughhole into a first ridge and a second ridge;
the first ridge and the second ridge each have an electrically conductive end face, the end faces opposing each other via the throughhole;
the opposing end faces of the first and second ridges and the throughhole together define a hollow waveguide;
the hollow waveguide is connected to a first waveguide extending between the waveguide face of the first ridge and the first electrically conductive surface, and to a second waveguide extending between the waveguide face of the second ridge and the second electrically conductive surface; and
a length of the first waveguide and a length of the second waveguide are each longer than a distance between the first electrically conductive surface and the second electrically conductive surface.

US Pat. No. 10,012,242

AXIAL FLOW FAN

NIDEC CORPORATION, Kyoto...

1. A fan comprising:a motor that rotates about a center axis extending up and down;
an impeller including a plurality of blades extending radially outward, the impeller being fixed to the motor;
a housing that surrounds outer peripheries of the motor and the impeller, the housing including a cylindrical inner circumferential surface; and
a plurality of ribs that interconnect the motor and the housing, wherein
the housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port, and a flow straightening grid disposed in the upper edge,
an axial distance from an upper end of each of the blades to a lower end of the flow straightening grid is ½ times or more of an axial distance from the upper end of each of the blades to a lower end thereof,
the housing further includes a flange portion extending radially outward from an upper edge of the housing to define a projection extending radially outward from remaining portions of the housing,
the flange portion includes four grid mounting portions provided on an upper surface of four corners of the flange portion,
the flow straightening grid is located on the four grid mounting portions, and
a holding member is disposed above the flow straightening grid in a perpendicular or substantially perpendicular relationship with the center axis, the holding member including a central hole which axially overlaps with the intake port, and
corners of the flow straightening grid are held between the four grid mounting portions and the holding member.

US Pat. No. 9,960,722

MOTOR CONTROLLER

NIDEC CORPORATION, Kyoto...

1. A motor controller which controls a switched reluctance motor, the motor controller comprising:an inverter connected with a three-phase concentrated winding switched reluctance motor;
a torque computation part which estimates or measures, as a calculated torque, a torque generated in the switched reluctance motor on the basis of an output from the inverter and a rotor angle of the switched reluctance motor;
a magnetic flux computation part which estimates or measures, as a calculated phase magnetic flux, a phase magnetic flux of each phase generated in the switched reluctance motor on the basis of the output from the inverter and the rotor angle of the switched reluctance motor; and
a switching control unit which controls the inverter by using at least a reference torque, which is a torque command value, and the calculated torque, wherein
the switching control unit includes a minimum magnetic flux maintenance part,
the minimum magnetic flux maintenance part controls the inverter such that the calculated phase magnetic flux of each phase becomes equal to or larger than a predetermined minimum value in a state where a rotational speed of the switched reluctance motor is above a predetermined speed,
the predetermined minimum value is increased as the rotational speed of the switched reluctance motor increases, and
the three-phase concentrated winding switched reluctance motor has a double salient pole structure with a rotor including a plurality of protrusions protruding toward a stator, and the stator includes a plurality of protrusions protruding toward the rotor.

US Pat. No. 9,879,766

ROTARY TRANSMITTING ASSEMBLY, DEVICE FOR CONVERTING ROTARY MOTION TO LINEAR MOTION, AND MOTOR

NIDEC CORPORATION, Minam...

15. A device for converting rotary motion to linear motion, comprising:
a housing having a bearing surface that sustains at least one bearing;
a stator with a plurality of coils arranged in a circumferential direction, wherein the stator is disposed on a cylindrical
portion of the housing;

a hollow shaft coupled to the housing rotatably around a first rotation axis, wherein the hollow shaft has at least one outer
circumferential stepped shaft portion and at least one inner circumferential stepped shaft portion;

a plurality of magnets disposed on a circumferential outer surface of the hollow shaft inwardly from the stator in a radial
direction;

a rod member coupled to the housing rotatably around the first rotation axis having at least one contacting portion and at
least one protruding part, wherein the at least one contacting portion contacts at least a part of the hollow shaft in a radial
direction and the at least one protruding part abuts at least one inner circumferential stepped shaft portion in an axial
direction;

the at least one bearing comprising at least one circular inner support part and at least one circular outer support part
supporting the hollow shaft and the rod member to the housing rotatably around the first rotation axis, wherein the at least
one circular inner support part abuts the at least a part of the at least one outer circumferential stepped shaft portion
in the axial direction and the at least one circular outer support part abuts the bearing surface of the housing in the axial
direction;

a stopper member fixed to the rod member, wherein the stopper member abuts the at least one circular inner support part in
the axial direction; and

a ball nut rotatably supported on spiral grooves on an outer circumferential periphery of the rod member, wherein the ball
nut moves in the axial direction of the first rotation axis in accordance with rotation of the rod member.

US Pat. No. 9,876,409

INNER-ROTOR MOTOR WITH UPPER AND LOWER BRACKETS PRESS-FIT WITH THE STATOR CORE, AND A CIRCUIT BOARD

NIDEC CORPORATION, Kyoto...

1. An inner-rotor motor comprising:
an upper bearing and a lower bearing;
a shaft supported by the upper and lower bearings to be rotatable about a rotation axis extending in a vertical direction;
a rotor magnet directly or indirectly fixed to the shaft;
a stator arranged radially outside of and opposite to the rotor magnet with a gap intervening therebetween;
an upper bracket arranged to hold the upper bearing; and
a lower bracket arranged to hold the lower bearing; wherein
the stator includes a stator core, an insulator, and windings wound around the stator core with the insulator intervening
therebetween;

the upper bracket includes an upper cylindrical cover press fitted to an outer circumference of the stator core from above,
an upper bearing holding portion arranged to extend in an axial direction and arranged to hold the upper bearing, and a top
plate portion arranged to join the upper cylindrical cover and the upper bearing holding portion to each other;

the lower bracket includes a lower cylindrical cover press fitted to the outer circumference of the stator core from below,
a lower bearing holding portion arranged to extend in the axial direction and arranged to hold the lower bearing, and a bottom
plate portion arranged to join the lower cylindrical cover and the lower bearing holding portion to each other;

at least one of the upper and lower bearings is an oil-impregnated sintered bearing;
each of the upper and lower brackets is fixed and press-fit to the stator core;
a surface of the insulator which is axially opposed to the upper bracket includes a board support surface arranged to be in
contact with a lower surface of the circuit board; and

an upper surface of the circuit board is arranged to be in direct contact with the upper bracket;
the upper cylinder cover includes:
a cylinder portion press fitted to the stator core; and
a board contact portion in direct contact with the upper surface of the circuit board;
the circuit board includes a ground pattern arranged therein; and
the ground pattern is directly electrically connected to the board contact portion at a portion of the circuit board which
is oppesed to the board contact portion.

US Pat. No. 9,712,007

ROTOR CORE, MOTOR AND MOTOR MANUFACTURING METHOD

NIDEC CORPORATION, Kyoto...

1. A rotor core comprising:
a laminated steel body including a plurality of axially laminated magnetic core plates extending in a direction perpendicular
or substantially perpendicular to a vertical center axis; and

a plurality of magnetic pole portions arranged along a circumferential direction with magnet insertion spaces defined between
adjoining ones of the magnetic pole portions, each of the plurality of magnetic pole portions including a pair of circumferential
end surfaces facing toward the magnet insertion spaces and a radial end surface facing toward a space that is radially outward
of each of the magnetic pole portions; wherein

at least some of the plurality of magnetic core plates include claws protruding from the plurality of magnetic pole portions
in the circumferential direction and outer connection portions located radially outward of the claws to interconnect the adjoining
ones of the plurality of magnetic pole portions;

the magnet insertion spaces are interposed between the circumferential end surfaces of the plurality of magnetic pole portions
and positioned radially inward of the claws;

a pair of the claws is positioned radially outward of each of the magnet insertion spaces;
a first space is provided between the pair of the claws positioned radially outward of each of the magnet insertion spaces,
each of the outer connection portions is positioned radially outward of the first space, and second spaces are provided between
the claws and the outer connection portions; and

the claws include slant surfaces which gradually become closer to base end portions of the claws along entire lengths of the
claws as the slant surfaces extend radially outward, the second spaces being provided between the slant surfaces and radial
inner surfaces of the outer connection portions.

US Pat. No. 9,698,637

MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a stationary portion including a stator; and
a rotating portion configured to be rotatable about a central axis extending in a vertical direction; wherein
the rotating portion includes:
a cylindrical or substantially cylindrical magnet including a pole surface located radially opposite to the stator;
a cylindrical or substantially cylindrical yoke located radially outside of the magnet; and
a hub including a hub cylindrical portion located radially outside of the yoke, and a hub upper plate portion extending radially
inward from an upper axial end of the hub cylindrical portion;

the stator includes a stator core which includes a magnetic body;
an upper portion of the yoke is fixed to the hub;
the yoke includes:
a first inner circumferential surface located radially opposite to an outer circumferential surface of the magnet with a first
gap intervening therebetween; and

a second inner circumferential surface located below the first inner circumferential surface, and including a portion located
radially opposite to the outer circumferential surface of the magnet with a second gap intervening therebetween;

the second inner circumferential surface is parallel or substantially parallel to the outer circumferential surface of the
magnet, and is located radially outward of the first inner circumferential surface;

an adhesive is provided in at least a portion of the first gap; and
no adhesive is provided in at least a lower axial end portion of the second gap.

US Pat. No. 9,589,589

SPINDLE MOTOR WITH SEALING MEMBER INCLUDING FLANGE AND DISK DRIVE APPARATUS INCLUDING SAME

NIDEC CORPORATION, Kyoto...

1. A spindle motor used in a disk drive apparatus to drive a disk, the disk drive apparatus including a housing defining an
interior space, the spindle motor comprising:
a bearing mechanism including a shaft having a center axis as a center thereof;
a sealing member having a one-end closed cylindrical shape and a recess receiving a lower portion of the bearing mechanism;
a stationary portion including a base defining a portion of the housing; and
a rotary portion that rotates relative to the stationary portion about the center axis via the bearing mechanism,
wherein
the base includes a through hole defined therein so as to have a center aligned with the center axis and pass through the
base in an axial direction,

the sealing member is fixed to the through hole,
the sealing member is fixed in a fixing region defined between an outer circumferential portion of the sealing member and
an inner circumferential portion that defines the through hole in the base,

the fixing region includes a sealing region where a clearance defined between the sealing member and the base is closed,
the sealing member includes a flange extending outward in a radial direction from a lower side surface of the sealing member,
the flange includes an upper surface overlapping with a lower surface of the base in the axial direction such that portions
of the flange are positioned axially lower than axially lowermost portions of the lower surface of the base, and

an adhesive is provided between the upper surface of the flange and the lower surface of the base.

US Pat. No. 9,979,249

BUS BAR UNIT AND MOTOR

NIDEC CORPORATION, Minam...

1. A bus bar unit used in a motor comprising a coil, the bus bar, comprising:a bus bar electrically connected to the coil of the motor;
a bus bar holder comprising a resin material and configured to hold the bus bar,
wherein the bus bar comprises a plurality of bus bar members comprising a metal material,
the plurality of bus bar members comprise a bent bus bar member which comprises a radial branch extending in a radial direction, a circumferential branch expanding in a circumferential direction, and a bent portion interposed between a first end portion of the radial branch and one a first end portion of the circumferential branch,
the radial branch comprises a terminal portion provided at a second end portion thereof and connected to a lead wire configuring the coil,
the circumferential branch has a first connection portion provided at a second end portion thereof, and
a connection portion is configured by connecting the first connection portion of the bent bus bar member and a second connection portion provided in a second one of the plurality of bus bar members, and at least a portion of the connection portion of the bus bar is held in the bus bar holder.

US Pat. No. 9,973,048

MOTOR

NIDEC CORPORATION, Minam...

1. A motor, comprising:a rotor comprising a shaft having its center on a vertically extended center axis;
a stator which is disposed at a radially outer side of the rotor; and
a bearing which supports the shaft,
wherein the rotor comprises a plurality of core pieces arranged on a radially outer side of the shaft along a circumferential direction, a plurality of permanent magnets to magnetize the core piece part, and a mold resin part made of resin and disposed between the plurality of core pieces,
the neighboring core pieces comprises a magnet insertion hole provided therebetween in a circumferential direction, extended in an axial direction for insertion of the permanent magnet,
the permanent magnet comprises two magnetic poles arranged along a circumferential direction, the magnetic poles of the circumferentially neighboring permanent magnets facing each other having identical polarity,
the mold resin part comprises at least one first guide part provided within the magnet insertion hole, the first guide part disposed closer to one side in a circumferential direction than the center in between the neighboring core pieces, and covers at least a portion of a surface on one side of the magnet insertion hole in a circumferential direction,
the permanent magnet being in direct contact or in indirect contact via resin with the core piece disposed on the other side of the magnet insertion hole in the circumferential direction,
wherein a relationship of L1?L2

US Pat. No. 9,893,588

MOTOR HOUSING WITH COOLING CHANNEL AND RESIN INJECTED WINDING ENDS FOR IMPROVED HEAT TRANSFER

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a stationary section;
a rotating section; and
a bearing mechanism which supports the rotating section to rotate relative to the stationary section about a center axis that
extends up and down,

wherein the stationary section comprises:
a housing which is made of metal and supports the bearing mechanism,
a stator holder which is made of metal and is disposed in the housing,
a stator which is held in the stator holder, and
a flow path for a cooling fluid, which is provided between the housing and the stator holder,
wherein the stator comprises:
a stator core which includes a core-back which is annular about the center axis, and a plurality of teeth which extend toward
an inside in a radial direction from the core-back,

a coil which is made of a conducting wire wound around the teeth, and
a resin portion which covers the coil,
wherein the housing comprises:
a housing cylindrical portion which is positioned closer to an outside in the radial direction than the stator and is substantially
cylindrical while extending in an axial direction, and

a housing flat plate portion which widens toward the inside in the radial direction from the housing cylindrical portion on
a side upper than the stator, and supports the bearing mechanism,

wherein the stator holder comprises:
a holder cylindrical portion which is positioned closer to the outside in the radial direction than the stator and closer
to the inside in the radial direction than the housing cylindrical portion, and is substantially cylindrical while extending
in the axial direction, and

a holder flat plate portion which is positioned on a side upper than the stator and on a side lower than the housing flat
plate portion, is unitary with the holder cylindrical portion as one piece, and widens toward the inside in the radial direction
from the holder cylindrical portion,

wherein an inner end portion of the holder flat plate portion is positioned closer to the inside in the radial direction than
an outer end portion of the coil,

wherein an upper surface of the holder flat plate portion and a lower surface of the housing flat plate portion contact each
other,

wherein the resin portion contacts a lower surface of the holder flat plate portion,
wherein the holder cylindrical portion includes a protrusion which protrudes inward in the radial direction on a side upper
than the stator core and on a side lower than the holder flat plate portion,

wherein an upper surface of the stator core and a lower surface of the protrusion contact each other, and
wherein an inside diameter of the protrusion is greater than or equal to an inside diameter of the core-back.

US Pat. No. 9,799,949

ON-VEHICLE RADAR DEVICE AND VEHICLE

NIDEC CORPORATION, Kyoto...

1. An on-vehicle radar device comprising:
a mount configured to be mounted on a bracket that is fixed to one of an innermost glass layer of laminated glass, a rear-view
mirror placed on an inner side of the innermost glass layer, and a ceiling, the laminated glass including the innermost glass
layer, an outermost glass layer, and an intermediate resin layer that is sandwiched between the innermost glass layer and
the outermost glass layer; and

an antenna configured to transmit a transmission wave from the inner side of the innermost glass layer to an outer side of
the outermost glass layer and to receive a reflected wave that enters from the outer side of the outermost glass layer to
the inner side of the innermost glass layer, the transmission wave being a radio wave in a millimeter wave band;
wherein
the antenna includes a transmitting antenna configured to transmit the transmission wave;
a vertical polarization component of the transmission wave relative to the laminated glass is greater than a horizontal polarization
component thereof;

when the mount is mounted on the bracket, an incident angle of the transmission wave on the innermost glass layer at a center
of a main lobe of the transmitting antenna is greater than a Brewster angle on an inner surface of the innermost glass layer,
and an incident angle of the transmission wave on the outermost glass layer at the center of the main lobe is less than or
equal to a Brewster angle between the outermost glass layer and the intermediate resin layer; and

a difference between the Brewster angle and the incident angle of the transmission wave on the innermost glass layer at the
center of the main lobe of the transmitting antenna is less than or equal to about 25% of a difference between 90 degrees
and the Brewster angle.

US Pat. No. 9,551,346

SERIAL AXIAL FAN

Nidec Corporation, Kyoto...

1. A serial axial fan comprising:
a first motor portion including a first rotating portion;
a first impeller fixed to the first rotating portion of the first motor portion;
a second motor portion arranged along a central axis of the first motor portion, and including a second rotating portion;
a second impeller fixed to the second rotating portion of the second motor portion;
a tubular wind channel portion arranged to surround outer circumferences of the first and second impellers; and
a plurality of support ribs arranged to join the wind channel portion to both the first and second motor portions; wherein
the first impeller includes a plurality of first blades arranged in a circumferential direction about the central axis, and
the second impeller includes a plurality of second blades arranged in the circumferential direction;

each of the first and second impellers is configured to be rotatable in both directions, and a rotation direction of the second
impeller is always opposite to a rotation direction of the first impeller;

a portion of a surface of each of the plurality of first blades, the surface facing the second impeller, is concave, and a
portion of a surface of each of the plurality of second blades, the surface facing the first impeller, is concave;

the plurality of support ribs are located between the first and second impellers;
an edge of each of the plurality of first blades on an opposite side with respect to the second impeller includes an inclined
portion configured to become progressively more distant from the second impeller with increasing distance from the central
axis; and

an edge of each of the plurality of the second blades on an opposite side with respect to the first impeller includes an inclined
portion configured to become progressively more distant from the first impeller with increasing distance from the central
axis.

US Pat. No. 10,140,850

MOTOR CONTROL DEVICE AND MOTOR CONTROL METHOD

NIDEC CORPORATION, Kyoto...

1. A motor control device configured to control rotation of a motor based on a single drive signal input from an input terminal, whereinthe motor control device stores a table in which at least one of a duty ratio, a voltage, and a frequency in the single drive signal is divided into a plurality of ranges;
the motor control device extracts two or more pieces of information including first drive information indicating a drive state or a drive stop state of the motor, second drive information indicating a rotation direction of the motor, third drive information indicating whether the motor is in a forced stop state, and fourth drive information indicating a rotational speed of the motor from the at least one of the duty ratio, the voltage, and the frequency in the single drive signal, and controls the motor according to the extracted two or more pieces of information;
in the table, a boundary range which has no drive signal is included in a boundary between adjacent ranges associated with the first drive information, the second drive information, and the third drive information; and
when the at least one of the duty ratio, the voltage, and the frequency in the single drive signal changes and is in the boundary range, information associated with a range including the at least one of the duty ratio, the voltage, and the frequency in the single drive signal before changing is extracted.

US Pat. No. 9,960,652

MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor comprising:a rotating portion which includes a commutator and is supported to be rotatably centered on a center axis which extends horizontally or substantially horizontally from front to rear;
a cup-shaped or substantially cup-shaped housing which accommodates at least a portion of the rotating portion;
a cup-shaped or substantially cup-shaped back cover which is disposed in a rear side of the housing, and, together with the housing, defines a casing;
a brush card which is disposed in the casing and widens in a direction perpendicular or substantially perpendicular to the center axis;
a brush which is disposed in a front side of the brush card and comes into contact with the commutator;
a connector member which is fixed to the back cover in a radially outer side of the brush card; wherein
the back cover includes:
a first rear wall portion which widens in the direction perpendicular or substantially perpendicular to the center axis in a rear side of the brush card; and
a first circumferential wall portion of a cylindrical or substantially cylindrical shape, which extends toward a front side from an outer circumferential portion of the first rear wall portion;
the first circumferential wall portion includes:
a through-hole which penetrates up-and-down through the first circumferential wall portion in a vicinity of a lower end portion of the first circumferential wall portion; and
a cut-out which is disposed in an upper side than the through-hole;
the connector member is fitted into the cut-out and includes a communication hole through which a lead wire passes;
an outer surface of the connector member is provided with a flow path groove which extends in a circumferential direction and an axial direction; and
an inner surface of the back cover includes a flow path surface which continues from a portion which opposes the flow path groove in a lower side of the flow path groove to the through-hole.

US Pat. No. 9,911,456

SPINDLE MOTOR AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A spindle motor comprising:
a base member;
a bearing mechanism fixed to the base member; and
a rotating portion rotatably supported by the bearing mechanism; wherein
the base member includes a cup portion including:
a cylindrical portion arranged to be coaxial or substantially coaxial with a central axis extending in a vertical direction;
and

a bottom plate portion defined integrally with the cylindrical portion, and arranged to close a lower portion of the cylindrical
portion;

the bearing mechanism is arranged inside of the cup portion;
an outer circumferential surface of the bearing mechanism and an inner circumferential surface of the cylindrical portion
have an adhesive layer arranged therebetween; and

the cup portion includes at least one communicating hole in a vicinity of a junction of the cylindrical portion and the bottom
plate portion, the communicating hole passing through the cylindrical portion in a direction that crosses an axial direction.

US Pat. No. 9,893,590

INNER-ROTOR BRUSHLESS MOTOR

NIDEC CORPORATION, Kyoto...

1. An inner-rotor brushless motor comprising:
a rotor portion including a shaft extending in a vertical direction along a central axis;
a stator portion located radially outside of the rotor portion; and
a bearing portion configured to support the rotor portion with respect to the stator portion; wherein
the rotor portion includes:
a rotor configured to rotate together with the shaft, and including at least one magnet; and
an upper cylindrical portion and a lower cylindrical portion located axially above and below, respectively, the rotor, and
configured to rotate together with the rotor;

the stator portion includes:
a stator located radially opposite to the rotor with a gap intervening therebetween;
a housing configured to hold the stator;
a cap located axially above the housing; and
a circuit board held by one of the housing and the stator, and including a rotation detection portion located thereon;
the bearing portion includes:
an upper bearing configured to rotatably support the shaft and held by the cap axially above the stator; and
a lower bearing configured to rotatably support the shaft and held by the housing axially below the stator;
the lower cylindrical portion includes a lower balance correction portion;
the upper cylindrical portion includes a detectable portion configured to be detected by the rotation detection portion located
thereon, and includes an upper balance correction portion; and

the upper cylindrical portion includes a member on which the detectable portion is provided, the member being separate from
the upper balance correction portion.

US Pat. No. 9,882,446

MOTOR

NIDEC CORPORATION, Kyoto...

1. A motor comprising:
a bearing portion including an upper bearing and a lower bearing;
a shaft including a central axis extending in a vertical direction as a center thereof, and rotatably supported by the bearing
portion;

a rotor magnet configured to rotate together with the shaft;
an armature located radially outside the rotor magnet; and
a casing configured to fix the armature and hold the upper and lower bearings at a radial center thereof, each of the upper
bearing and the lower bearing being configured to rotatably support the shaft; wherein

the armature includes:
a stator core including an annular core back and a plurality of magnetic pole teeth that project radially inward from the
core back;

an insulator that covers at least an upper surface and a lower surface of each of the plurality of magnetic pole teeth of
the stator core;

coils, each of the coils being defined by a conducting wire wound around a separate one of the plurality of magnetic pole
teeth with the insulator intervening therebetween; and

passage lines located circumferentially between adjacent ones of the plurality of magnetic pole teeth to electrically connect
one of the coils and another one of the coils with each other;

the insulator includes:
magnetic pole tooth insulating portions that each cover a separate one of the plurality of magnetic pole teeth; and
a core back insulating portion integral with each of the plurality of magnetic pole tooth insulating portions, the core back
insulating portion covering at least a portion of an upper end surface and a portion of a lower end surface of the core back;

the core back insulating portion includes:
a plurality of passage line guide walls, each of the plurality of passage line guide walls projecting in an axial direction
away from a surface of core back insulating portion covering the core back;

a plurality of passage line holding portions, each of the plurality of passage line holding portions projecting in the axial
direction away from the surface covering the core back, and each of the plurality of passage line holding portions supporting
at least one of the passage lines with a radially outer surface thereof radially inside a separate one of the passage line
guide walls; and

a plurality of coil guide walls, each of the plurality of coil guide walls projecting in the axial direction away from the
surface covering the core back, and each of the plurality of coil guide walls are radially opposite a radially outer side
of a corresponding one of the coils radially outside a corresponding one of the plurality of magnetic pole teeth; and

an upper end of a portion of each of the plurality of passage line guide walls that is radially opposed to a corresponding
one of the passage line holding portions is located at an axial level lower than an axial level of an upper end of the corresponding
passage line holding portion.

US Pat. No. 10,440,858

BRUSHLESS DC MOTOR, AND IDENTIFICATION METHOD AND IDENTIFICATION APPARATUS OF IDENTIFYING TYPE OF BRUSHLESS DC MOTOR

NIDEC CORPORATION, Kyoto...

1. An identification method for use in an identification apparatus that identifies a type of brushless DC motor, whereinthe brushless DC motor includes a circuit board on which a terminal for tachometer is mounted,
the numbers of pulses per rotation or unit time outputted from the terminals for tachometer vary among a plurality of types of brushless DC motors, and
the method comprises:
supplying a power supply voltage from the identification apparatus to the brushless DC motor;
inputting a pulse signal outputted from the terminal for tachometer to the identification apparatus;
counting the number of pulses in the pulse signal;
obtaining a unique information piece of the brushless DC motor based on the counted number of pulses; and
identifying a type of the brushless DC motor based on the unique information piece of the brushless DC motor.

US Pat. No. 9,879,691

DYNAMIC PRESSURE BEARING PUMP

NIDEC CORPORATION, Kyoto...

1. A dynamic pressure bearing pump comprising: a shaft portion arranged to extend in a vertical direction; a rotor portion
arranged to surround an outer circumference of the shaft portion, and including a magnet; and a housing joined to the shaft
portion, and arranged to contain the rotor portion; wherein the housing includes: a stator arranged opposite to the magnet;
a rotor accommodating portion arranged to accommodate the rotor portion; and an inlet and an outlet each of which is arranged
to pass through a portion of the rotor accommodating portion; a surface of at least one of the rotor portion, the shaft portion,
and the rotor accommodating portion includes at least one first dynamic pressure groove arranged to support rotation of the
rotor portion; and a surface of at least one of the rotor portion and the rotor accommodating portion includes at least one
second dynamic pressure groove arranged to transfer a fluid from the inlet to the outlet; the rotor portion is arranged to
have the shaft portion as a central axis thereof, is substantially cylindrical, and is arranged to have the shaft portion
inserted therethrough in an axial direction; the rotor portion includes: a rotor inner circumferential surface arranged opposite
to a shaft outer circumferential surface of the shaft portion; a rotor outer circumferential surface arranged opposite to
a housing inner circumferential surface of the rotor accommodating portion; and a rotor upper surface and a rotor lower surface
each of which is perpendicular or substantially perpendicular to the shaft portion; at least one of the shaft outer circumferential
surface and the rotor inner circumferential surface includes at least one radial dynamic pressure groove defined therein;
at least one of an inner surface of the rotor accommodating portion, the rotor upper surface, and the rotor lower surface
includes at least one thrust dynamic pressure groove defined therein; the at least one second dynamic pressure groove is defined
in at least one of the housing inner circumferential surface and the rotor outer circumferential surface; and each of the
outlet and the inlet is arranged to open normal to the rotor outer circumferential surface.

US Pat. No. 9,800,116

DC BRUSHLESS MOTOR INCLUDING COVER PORTION WITH FAN BLADES

NIDEC CORPORATION, Kyoto...

1. A DC brushless motor used to drive stirring blades that perform stirring in a heating chamber, the motor comprising:
a housing including a plurality of attachment portions each of which extends toward one axial side where the heating chamber
is located, a base portion on an opposite axial side of the attachment portions and joined to the attachment portions, and
a bearing holding portion joined to the base portion;

a bearing member held by the bearing holding portion;
a shaft supported by the bearing member to be rotatable about a central axis, and including a portion on the one axial side
to which the stirring blades that perform stirring in the heating chamber are joinable;

a rotor holder fixed to the shaft, being in or substantially in a shape of a covered cylinder with an opening facing toward
the opposite axial side, and including a cover portion and a cylindrical portion;

a rotor magnet held on an inside of the cylindrical portion of the rotor holder;
a stator radially inside the rotor magnet; and
a circuit board electrically connected with the stator, and axially opposite the opening of the rotor holder; wherein
the cover portion of the rotor holder includes a through hole passing therethrough in an axial direction, and a fan blade
integrally defined with the cover portion and producing air current passing from the opposite axial side toward the one axial
side;

the fan blade is adjacent to and on one circumferential side of the through hole; and
the fan blade extends from a position radially outward of a radially inner end of the through hole to a position radially
inward of a radially outer end of the through hole.

US Pat. No. 9,800,118

SELF-COOLED MOTOR

NIDEC CORPORATION, Kyoto...

1. A self-cooled motor comprising:
two or more attachment portions;
a shaft extending supported by a bearing so as to be rotatable about a rotation axis extending in a vertical direction;
a rotor configured to rotate together with the shaft;
a stator located radially opposite to the rotor;
a housing configured to support the bearing and the stator; and
an impeller located axially below the rotor, and configured to rotate together with the shaft to generate an air current traveling
radially outward; wherein

the housing includes:
a base portion located axially above the rotor;
the two or more attachment portions, each of the two or more attachment portions being located radially outward of the rotor;
and

a cylindrical or substantially cylindrical cover portion configured to join the base portion and the two or more attachment
portions to each other;

a lower end of each of the two or more attachment portions is located at an axial level lower than an axial level of the impeller;
the base portion includes an air inlet;
the cover portion includes an air outlet located between adjacent ones of the two or more attachment portions, and configured
to connect a space radially inside the housing and a space radially outside the housing with each other;

the two or more attachment portions are configured to attach the self-cooled motor to a wall surface of a high temperature
chamber such that the shaft will extend into the high temperature chamber;

the rotor includes a rotor magnet and a rotor holder, the rotor holder including a cylindrical portion and a bottom plate
portion;

the bottom plate portion is directly opposed to and facing the wall surface of the high temperature chamber; and
the impeller generates an airflow which travels radially outward along the wall surface.

US Pat. No. 9,691,436

TOP COVER AND DISK DRIVE APPARATUS

NIDEC CORPORATION, Kyoto...

1. A disk drive apparatus, comprising:
a housing in which a disk is accommodated and rotatable about a central axis extending in a vertical direction;
a top cover that closes an opening of the housing, the top cover including:
a plate-shaped top cover body that extends perpendicularly to the central axis; and
a flow control member fixed to a lower surface of the top cover body;
a spindle motor that causes the disk to rotate about the central axis; and
an access portion that performs at least one of reading and writing of information from or to the disk; wherein
the housing supports the spindle motor and the access portion and defines a case together with the top cover;
the top cover body is axially opposite to the disk;
the flow control member includes a lower surface axially opposite to at least a portion of an upper surface of the disks;
the access portion includes a head opposite to the disk;
the flow control member is outside of a range over which the head moves in a plan view;
at least a portion of the flow control member and at least a portion of the access portion radially or circumferentially overlap
with each other; at least a portion of the flow control member and the head circumferentially overlap over the full range
of head movement; and an axial distance between the flow control member and the disk decreases with increasing distance from
the central axis.

US Pat. No. 9,207,453

MIRROR ROTATING APPARATUS

Nidec Corporation, Kyoto...

1. A mirror rotating apparatus comprising:
a stationary portion; and
a rotating portion configured to rotate about a rotation axis extending in a vertical direction with respect to the stationary
portion; wherein

the stationary portion includes:
a stator; and
a detection sensor configured to detect rotation of the rotating portion;
the rotating portion includes:
a rotor magnet arranged radially opposite to the stator; and
a mirror portion whose outside surface includes a plurality of mirror surfaces each of which is arranged to face radially
outward;

the mirror portion includes:
a rotation detection surface arranged opposite to the detection sensor; and
a balance correction portion defined by a groove or a projection extending in a circumferential direction in the rotation
detection surface;

the balance correction portion is arranged such that a center of gravity of the mirror portion is closer to the rotation axis
as compared to a case where the balance correction portion is not provided;

the detection sensor is configured to emit light toward the rotation detection surface and receive the light reflected from
the rotation detection surface; and

the rotation of the rotating portion causes the balance correction portion to pass a region to which the light is emitted
from the detection sensor.

US Pat. No. 9,747,953

DISK DRIVE BASE UNIT WITH COMMUNICATING GROOVE EXTENDING OUTSIDE OUTER CIRCUMFERENTIAL PORTION OF CONNECTOR

NIDEC CORPORATION, Kyoto...

1. A base unit for use in a disk drive apparatus including a case an interior of which is filled with helium, hydrogen, a
gas mixture of helium and hydrogen, or a gas mixture of air and any one of helium, hydrogen, and the gas mixture of helium
and hydrogen, the base unit comprising:
a base member arranged to support a motor; and
a connector electrically connected to a head included in an access portion arranged to perform at least one of reading and
writing of information from or to a disk supported by a rotating portion of the motor; wherein

the base member includes:
a bottom plate portion arranged to extend perpendicularly to a central axis of the motor;
a window portion arranged to pass through the bottom plate portion in an axial direction; and
a first groove defined in an upper surface or a lower surface of the bottom plate portion around the window portion;
the connector includes:
a board portion arranged on the upper surface or the lower surface of the bottom plate portion, and arranged to cover the
window portion and at least a portion of the first groove; and

an electrode terminal arranged on the board portion;
the electrode terminal is arranged on an upper or lower side of the window portion;
an adhesive layer is arranged between the bottom plate portion and a surface of the board portion facing the bottom plate
portion;

the adhesive layer is arranged to define a continuous closed loop around the window portion;
a portion of the adhesive layer is held in at least a portion of the first groove; and
the first groove includes at least one communicating groove arranged to extend up to a position outside of an outer circumferential
portion of the connector.

US Pat. No. 9,929,614

MOTOR WITH INTEGRATED SLOT LINER AND BOBBIN WITH GUIDES FOR CONDUCTOR COILS

NIDEC CORPORATION, Kyoto...

1. A motor comprising:a bearing portion including an upper bearing and a lower bearing;
a shaft, including a central axis extending in a vertical direction as a center thereof, rotatably supported by the bearing portion;
a rotor magnet that rotates together with the shaft;
an armature radially outside the rotor magnet;
an upper bracket axially above the armature, and that holds the upper bearing at a radial center thereof, the upper bearing being configured to rotatably support the shaft;
a lower bracket axially below the armature, and that holds the lower bearing at a radial center thereof, the lower bearing being configured to rotatably support the shaft; and
a fixing member that extends in the vertical direction, and fixes the armature to each of the upper and lower brackets; wherein
the armature includes:
a stator core including a core back and a plurality of magnetic pole teeth configured to project radially inward from the core back;
an insulator that covers at least an upper surface and a lower surface of each of the plurality of magnetic pole teeth of the stator core; and
coils each of which is defined by a conducting wire wound around a separate one of the plurality of magnetic pole teeth with the insulator intervening therebetween;
the insulator includes:
magnetic pole tooth insulating portions each of which covers a separate one of the plurality of magnetic pole teeth; and
a core back insulating portion integrally provided with each of the magnetic pole tooth insulating portions as a single monolithic member, and covering at least portions of upper and lower end surfaces of the core back;
the stator core further includes a fixing member arranging portion that has the fixing member inserted therethrough in an axial direction, located radially outside one of the plurality of magnetic pole teeth, and defined by a through hole or a cut recessed radially inward from a radially outer circumference of the stator core;
the core back insulating portion includes:
coil guide walls, each of which is located radially outside a corresponding one of the plurality of magnetic pole tooth insulating portions;
a fixing member insertion recessed portion or through hole which is positioned directly adjacent to the fixing member; and
a cut portion at a position radially opposed to the fixing member and radially inward from the fixing member insertion recessed portion or through hole;
a radially inner surface of each of the coil guide walls is in contact with a corresponding one of the coils;
the fixing member insertion recessed portion or through hole and the cut portion are provided in a flange of the core back insulating portion which is in direct contact with one of the upper and lower end surfaces of the core back; and
the cut portion is defined by a radially extending channel passing completely through one of the coil guide walls such that no portion of the one of the coil guide walls is between the fixing member and a corresponding one of the coils.

US Pat. No. 9,822,787

DYNAMIC PRESSURE BEARING APPARATUS AND FAN

NIDEC CORPORATION, Kyoto...

1. A dynamic pressure bearing apparatus comprising:
a bearing portion;
a shaft inserted in the bearing portion, and arranged to rotate about a central axis relative to the bearing portion, an outer
circumferential surface of the shaft including an attachment surface to which an impeller is to be attached directly or through
one or more members;

a radial dynamic pressure bearing portion defined by an inner circumferential surface of the bearing portion, the outer circumferential
surface of the shaft, and a portion of a lubricating oil which exists in a radial gap defined between the inner circumferential
surface of the bearing portion and the outer circumferential surface of the shaft, and arranged to generate a fluid dynamic
pressure in the portion of the lubricating oil;

a seal gap defined by the inner circumferential surface of the bearing portion and the outer circumferential surface of the
shaft on an upper side of the radial dynamic pressure bearing portion, the seal gap including a seal portion having a surface
of the lubricating oil defined therein; and

an annular member arranged in an annular shape, fixed to the shaft axially between the seal portion and the attachment surface,
and arranged to extend radially outward beyond an opening of the seal gap; wherein

a horizontal gap extending radially is defined between an upper surface of the bearing portion and a lower surface of the
annular member; and

the seal gap is arranged to be in communication with an exterior space through the horizontal gap.

US Pat. No. 9,693,616

HAIR DRYER

NIDEC CORPORATION, Kyoto...

1. A hair dryer that sends air forward along a central axis extending in a direction from a front of the hair dryer to a rear
of the haft dryer, the hair dryer comprising:
a fan motor;
a heater; and
a hollow tubular body case that covers the fan motor and the heater, and that extends in the direction around the central
axis to define an interior space; wherein

the fan motor includes:
an impeller that rotates about the central axis; and
a motor that drives the impeller;
the body case includes:
an intake case portion including an air inlet; and
a discharge case portion including an air outlet;
the body case includes an inner tubular case portion accommodated therein adjacent to the air outlet, the inner tubular case
portion extending along an inside surface of the body case;

the inside surface of the body case and the inner tubular case portion directly contact one another about an entire circumference
to define an enclosed silencing space therebetween; and

an opening portion is defined: (i) between the inner tubular case portion and the body case, or (ii) in the inner tubular
case portion, the opening portion joins the silencing space and the interior space.

US Pat. No. 10,566,870

MOTOR AND METHOD OF MANUFACTURING THE SAME

NIDEC CORPORATION, Kyoto...

1. A motor, comprising:a rotor having a shaft which has its center on a center axis extending in one direction;
a stator which surrounds the rotor in the axial circumference, and has a plurality of coils; and
bus bars connecting coil ends extending from the coils,
wherein the bus bars are formed of a plate shape member bent in a thickness direction, a width direction of the bus bars being identical to an axial direction of the motor, and
each of the bus bars has a main body portion, and a coil end connection portion which extends from the main body portion and grips one of the coil ends at an opening that is open toward one direction within a plane perpendicular to the axial direction,
a bus bar holder which supports the bus bar,
the main body portion of the bus bar is supported by being sandwiched between a pair of bus bar fixing pieces of the bus bar holder in a thickness direction,
the bus bar holder has an axially penetrating notch to which the coil end is inserted, and
when viewed from the axial direction, the notch overlaps with the coil end connection portion of the bus bar, and the opening of the notch is open toward the same direction as the opening of the coil connection portion.