Nidec Corporation

Takayuki Makino

Masato Aono

Tsubasa Hirayama

Masahiro Kokubo

Yuhei Yamaguchi

Hisashi Fujihara

Keigo Nakamura

Tatsuhiko Mizutani

Satoshi Mukai

A motor includes an electrical discharging device including a conductive member in contact with a region of the outer surface of a shaft extending in the axial direction along the rotation axis parallel to the horizontal direction. When viewed from the axial direction, the electrical discharging device is disposed on one side and the other side in a direction perpendicular to the axial direction and parallel to the horizontal direction with respect to a contact portion between the shaft and the conductive member, or is disposed on a vertically obliquely upper side with respect to the contact portion. The electrical discharging device is further disposed on one side and the other side in the above-described parallel direction with respect to the rotation axis or is disposed on the vertically obliquely upper side with respect to the rotation axis when viewed from the axial direction.

Motor

A shaft of a motor includes a first shaft and a second shaft extending from the first shaft to one axial side. A housing includes a neutralizing device holder that holds a first neutralizing device. The neutralizing device holder includes a seal holder that is arranged radially outward of the second shaft and holds a 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 the other axial side of the first neutralizing device.

Motor and drive device

A motor includes a rotor configured to rotate about a central axis extending in an up-down direction, a stator located radially outside the rotor, a bracket located above the stator, a circuit board held by the bracket and disposed along a plane perpendicular to an axial direction, and a bus bar held by the bracket and connected to the circuit board at a terminal connection portion. The bracket includes a board support portion supporting the circuit board from below, and a wall portion protruding upward to be higher than the board support portion and surrounding the circuit board. The wall portion has a cutout portion extending downward from an upper end of the wall portion.

A shaft of a motor includes a first shaft having a tubular shape extending in an axial direction, a lid portion disposed in one axial end portion of the first shaft, a second shaft extending on one axial side from the lid portion, a first shaft through hole penetrating the first shaft in a radial direction, and a second shaft through hole communicating with an inside of the first shaft and an external space of the shaft. The lid portion and the second shaft have conductivity. The second shaft through hole is disposed on one axial side with respect to the first shaft through hole. The second shaft is in contact with an electrical discharging device that electrically connects the shaft and the housing of the motor.

An electrical discharging device electrically connects a shaft of a motor and a housing. A plate portion of the housing has an opening through which the shaft is inserted and expands in a radial direction. A cover member is disposed on the plate portion and covers the electrical discharging device. A seal member is disposed between the shaft and the plate portion in the opening. The through hole is disposed in the plate portion and/or the cover member. The electrical discharging device is accommodated in an accommodation space surrounded by the plate portion and the cover member. The accommodation space is connected to the outside through the through hole.

Motor having an electrical discharging device and cover member

A motor assembly includes a motor including a rotor including a shaft rotatable about a rotation axis and a stator surrounding the rotor from radially outside, a housing that accommodates the motor, a bearing that is fixed to the housing and rotatably supports the shaft, a resolver including a resolver rotor fixed to the shaft and a resolver stator fixed to the housing, and a contact that has conductivity, is fixed to the housing, and is in contact with a contacted portion at an end portion on one axial side of the shaft. The housing includes an accommodation space in which the contacted portion of the shaft is accommodated. The contact and the resolver are side by side in a direction along a rotation axis in the accommodation space.

Motor unit

A motor unit includes a bearing rotatably holding a shaft, and a housing accommodating a rotor, a stator, and the bearing. The housing has an opening, a cover closing the opening and fixed to the housing, and an annular member that has an annular shape when viewed from the axial direction and is provided independently from the bearing. The cover includes an accommodation portion accommodating the annular member, one or more ribs disposed radially outward of the accommodation portion when viewed from the axial direction, and one or more fixing points fixed to the housing. The one or more ribs extend outward from the accommodation portion. When viewed from the axial direction, for at least one of the ribs, the fixing point is formed on an extension line extending outward from the rib in a direction in which the rib extends.

Growing community of inventors

Kyoto, Japan

Takayuki Makino