IP Library › Granted Patent US 12683446
Granted Patent B2
US 12683446 · App. 18/692,439 · Granted Jul 14, 2026

Rotor and motor

Inventor: Yuusuke Fukushima (Minamitsuru-gun, JP)
Assignee: FANUC CORPORATION
H02K1/28H02K1/276
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Quick Facts
Patent No.
US 12683446
App. No.
18/692,439
Granted
Jul 14, 2026
Kind
B2
Abstract

A rotor includes a rotor core; a plurality of magnets respectively inserted in a plurality of first through-holes formed in the rotor core; and a plurality of rods respectively inserted in a plurality of second through-holes formed in the rotor core. A first gap between each of the first through-holes and the corresponding magnet is larger than a second gap between each of the second through-holes and the corresponding rod.

Claims (14)

1 . A rotor, comprising:

a rotor core,

a plurality of magnets which are inserted into a plurality of first through holes formed in the rotor core, and

a plurality of rods which are inserted into a plurality of second through holes formed in the rotor core, wherein

a first cavity between an inner wall of each of the plurality of first through holes and each of the plurality of magnets is larger than a second cavity between an inner wall of each of the plurality of second through holes and each of the plurality of rods, and wherein

the first cavity is a portion of the first through hole,

the second cavity is a portion of the second through hole,

any side surface of the plurality of magnets, which is perpendicular to a circumferential direction of the rotor core, is parallel and movable to any inner wall of the plurality of first through holes, which faces the side surface of the plurality of magnets.

2 . The rotor according to claim 1 , wherein the first cavity is a cavity formed in the circumferential direction of the rotor core,

the second cavity is a cavity formed in the circumferential direction of the rotor core, and

a ratio of the first cavity to a distance from a center of the rotor core to each of the plurality of magnets is greater than a ratio of the second cavity to a distance from the center of the rotor core to each of the plurality of rods.

3 . The rotor according to claim 1 , wherein each of the first cavity and the second cavity is greater than zero.

4 . The rotor according to claim 1 , wherein when each of the plurality of magnets and each of the plurality of rods located at a position corresponding to each of the plurality of magnets are in a same phase, a distance from the center of the rotor core to each of the plurality of magnets is greater than the distance from the center of the rotor core to each of the plurality of rods.

5 . A motor comprising the rotor according to claim 1 and a stator arranged around the rotor.