Nidec Corporation

Rohm Co., Ltd.

Keigo Nakamura

Yuhei Yamaguchi

Hisashi Fujihara

Keisuke Fukunaga

Ryusuke Sato

Shohei Fujimoto

Yuki Ishikawa

Eiji Yokoyama

Shuhei Nakamatsu

Takashi Shiraishi

Naoya Tanaka

Takayuki Makino

Daichi Furukawa

Yoshiyuki Aono

LiPeng Li

A drive device includes a first bearing lubricated by a fluid and a second bearing lubricated by a lubricant having a higher electrical conductivity than the fluid. The first bearing rotatably supports a shaft extending in the axial direction along the rotation axis. A housing of the drive device has a first bearing holder that holds the first bearing. The second bearing is arranged between the shaft and the housing and rotatably supports the shaft. The second bearing is arranged in a space isolated from the first bearing holder.

Drive device and vehicle

A motor assembly includes a motor with a rotor rotatable about a motor shaft and a stator located radially outside the rotor, an inverter to supply power to the motor, a housing provided with a motor housing space that houses the motor and an inverter housing space that houses the inverter, and a first bus bar that electrically connects the motor and the inverter. The housing includes a partition wall portion that partitions the motor housing space and the inverter housing space and is provided with a through hole penetrating in the axial direction. The first bus bar is connected to a coil wire extending from the stator at an end on one side in the axial direction of the stator in the motor housing space, and extends to the inverter housing space through the through hole.

Motor with inverter and bus bar arrangement

A partition wall of a drive device has a first partition wall and a second partition wall. The first partition wall extends in a direction intersecting with an axial direction and covers one end portion of a motor housing in the axial direction. The second partition wall extends in a direction intersecting with the axial direction and is disposed on one side in the first direction perpendicular to the axial direction with respect to the first partition wall, and covers the other end portion of the gear housing in the axial direction together with the first partition wall. The second partition wall is disposed on one side in the axial direction with respect to the first partition wall.

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.

Motor

A drive apparatus includes: a motor having a rotor and a stator core; a housing; and a first injection port to inject a refrigerant into the stator core. The stator core includes: a core body surrounding the rotor; and a fixing portion projecting radially outward from the core body and fixed to the housing. The fixing portion includes an upper fixing portion. The first injection port is lower than an end portion of the upper fixing portion. The upper fixing portion is on one circumferential side of the first injection port. The first injection port is open in a first direction facing a directly lower side or a second direction angled to the one circumferential side with respect to the first direction, and is facing a portion on the other circumferential side of a boundary with an end portion of the upper fixing portion on the other circumferential side.

Drive apparatus

A motor includes a rotor including a shaft centered on a vertically extending center axis, a stator radially opposite to the rotor and including coils, a bearing supporting the shaft, and a bus bar assembly on an upper side in an axial direction of the stator. The bus bar assembly includes bus bars including a terminal portion connected to a lead wire drawn out from the coil and a bus bar holder holding the bus bars. The terminal portion includes a slit which extends axially downward and into which the lead wire is fitted. The width of the slit is narrower than the diameter of the lead wire.

A drive apparatus includes a motor, a transmission system, and a housing having a motor housing accommodating the motor and a gear housing accommodating the transmission system. The transmission system includes a first gear supported by a first bearing and a second gear supported by a second bearing. The gear housing includes first and second holding portions holding the first and second bearings. Surrounding ribs project from a wall surface of the gear housing, and surround an area that encompasses the first and second bearings when viewed in an axial direction. The surrounding ribs include arc-shaped ribs along outer circumferential edges of the first and second bearings, and straight ribs connected to the arc-shaped ribs. One or more of the straight ribs are each located on a common tangent to the first bearing and the second bearing.

A motor includes a rotor including a shaft centered on a vertically extending center axis, a stator radially opposite to the rotor and including coils, a bearing supporting the shaft, and a bus bar unit on an upper side in an axial direction of the stator. The bus bar unit includes bus bars including a terminal portion connected to a lead wire drawn out from the coil and a bus bar holder holding the bus bars. The terminal portion includes a slit which extends axially downward and into which the lead wire is fitted. The width of the slit is narrower than the diameter of the lead wire.

A circuit board ( ) is provided upon which a predetermined number of semiconductor elements ( ), including at least a field-effect transistor for charge and discharge, are mounted. A predetermined number of passive elements ( ) are also mounted onto the circuit board. The semiconductor elements ( ) are mounted facedown as bare chips on the circuit board ( ).

Growing community of inventors

Kyoto, Japan

Keigo Nakamura