US Patent No. 9,877,418

MOTOR DRIVE DEVICE IN WHICH FAN MOTOR IS EXCHANGEABLE AND CONTROL PANEL INCLUDING SAME


Patent No. 9,877,418
Issue Date January 23, 2018
Title Motor Drive Device In Which Fan Motor Is Exchangeable And Control Panel Including Same
Inventorship Genzo Naito, Yamanashi (JP)
Kazuhiro Yamamoto, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,877,418

1. A motor drive device comprising:
a motor control unit disposed in a control panel;
an attaching unit provided on one side of the motor control unit and having first surface directed toward a front of the control
panel and a second surface opposite to the first surface;

a heat sink attached to the one side of the motor control unit or the second surface of the attaching unit to absorb heat
of the motor control unit;

a first duct disposed in opposing relationship to the second surface of the attaching unit;
a second duct disposed at a side opposite to a side of the attaching unit at which the first duct is disposed and in opposing
relationship to the first duct; and

an air blower disposed in the second duct,
wherein:
between the first duct and the second duct, there are formed a first opening that allows communication between outside of
the first duct and inside of the second duct, and a second opening that allows communication between inside of the first duct
and inside of the second duct;

the first duct is provided so as to connect the heat sink and the second opening with each other;
the second duct is provided so as to connect the first opening and the second opening with each other; and
the air blower is disposed so as to generate an air flow from the first opening to the second opening or from the second opening
to the first opening.