US 11,990,817 B2
Motor and drive device
Takayuki Makino, Kyoto (JP); and Masato Aono, Kyoto (JP)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Filed by NIDEC CORPORATION, Kyoto (JP)
Filed on Jun. 24, 2022, as Appl. No. 17/848,396.
Claims priority of application No. 2021-108488 (JP), filed on Jun. 30, 2021.
Prior Publication US 2023/0006498 A1, Jan. 5, 2023
Int. Cl. H02K 5/04 (2006.01); H02K 1/12 (2006.01); H02K 1/22 (2006.01); H02K 7/00 (2006.01)
CPC H02K 5/04 (2013.01) [H02K 1/12 (2013.01); H02K 1/22 (2013.01); H02K 7/003 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A motor, comprising:
a shaft including a first shaft axially extending along a rotation axis;
a rotor that is fixed to the shaft, and is rotatable about the rotation axis;
a stator radially facing the rotor with a gap between the stator and the rotor;
a bearing rotatably supporting the shaft;
a housing accommodating the rotor, the stator, and the bearing;
a first neutralizing device; and
a seal member,
wherein the shaft further includes a second shaft extending from the first shaft to one axial side,
the housing includes:
a bearing holder that has an opening through which the first shaft is inserted, and holds the bearing; and
a neutralizing device holder that holds the first neutralizing device, and covers at least a part of the opening,
the neutralizing device holder includes a seal holder that is arranged radially outward of the second shaft, and holds the seal member,
the first neutralizing device electrically connects the second shaft and the neutralizing device holder,
the seal member seals a gap between the second shaft and the seal holder, and is arranged on another axial side of the first neutralizing device,
the first shaft includes:
a shaft tubular portion that axially extends and has a tubular shape surrounding the rotation axis, and
a shaft lid arranged on the one axial side of the shaft tubular portion,
the shaft further includes:
a first shaft through-hole radially penetrating the first shaft, and
a second shaft through-hole that causes a space, surrounded by the shaft tubular portion and the shaft lid, to communicate with an outside of the shaft, and
the second shaft through-hole is arranged on the one axial side of the first shaft through-hole and radially outward of the second shaft.