US 12,266,995 B2
Motor and drive apparatus having a conductive bearing
Ho Quang Danh, Kyoto (JP); Kenichiro Hamagishi, Kyoto (JP); and Takahiro Uetani, Kyoto (JP)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Filed by NIDEC CORPORATION, Kyoto (JP)
Filed on Sep. 20, 2022, as Appl. No. 17/948,232.
Claims priority of application No. 2021-157614 (JP), filed on Sep. 28, 2021.
Prior Publication US 2023/0093962 A1, Mar. 30, 2023
Int. Cl. H02K 7/08 (2006.01); H02K 11/21 (2016.01); B60K 1/00 (2006.01)
CPC H02K 7/083 (2013.01) [H02K 11/21 (2016.01); B60K 2001/001 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A motor comprising:
a tubular motor shaft extending in an axial direction along a rotation axis;
a rotor rotatable together with the motor shaft about the rotation axis;
a stator facing the rotor with a gap therebetween in a radial direction;
a first bearing that rotatably supports the motor shaft;
a motor housing having a bearing holder that holds the first bearing and accommodating the rotor and the stator;
a second bearing disposed inside the motor shaft at one axial end portion of the motor shaft and having electric resistance lower than electric resistance of the first bearing; and
a conductive member electrically connecting the second bearing to the motor housing,
wherein a radially outer end portion of the second bearing is in contact with an inner peripheral surface of the motor shaft, and
the conductive member includes a contact portion in contact with a radially inner end portion of the second bearing, a fixed portion fixed to the motor housing radially outward of the motor shaft, and a bridge portion connecting the contact portion and the fixed portion.