US Patent No. 9,462,727

LC FILTER HAVING A FUNCTION TO COOL AC REACTOR


Patent No. 9,462,727
Issue Date October 04, 2016
Title Lc Filter Having A Function To Cool Ac Reactor
Inventorship Masatomo Shirouzu, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,462,727

1. An LC filter comprising:
a first AC reactor comprising a first core and a first coil wound around one portion of the first core wherein one terminal
of the first coil is connected to an AC power source;

a second AC reactor comprising a second core and a second coil wound around one portion of the second core so as to provide
a first gap between the second core and the second coil, wherein one terminal of the second coil is connected to a power convertor
which converts AC voltage to DC voltage, and the second AC reactor is larger than the first AC reactor;

a capacitor which has one terminal connected to another terminal of the first coil and another terminal of the second coil;
a casing housing the first AC reactor, the second AC reactor and the capacitor;
a cooling air introduction portion provided on one surface of the casing to introduce cooling air; and
a cooling air discharge portion provided on another surface of the casing opposite the one surface to discharge the cooling
air such that a flow of the cooling air is in a predetermined direction,

wherein the second AC reactor is positioned so as to provide a second gap between the outer periphery of the second coil and
the casing, and so that an axial direction of the second coil coincides with the predetermined direction of the flow of the
cooling air along the second gap.