Nidec Corporation

Hibiki Takada

Takahiro Hiwa

Tomoya Ueda

Shohei Fujimoto

Shuhei Nakamatsu

Hisashi Fujihara

Satoshi Kajikawa

Keisuke Aso

Tatsuhiko Mizutani

Kengo Takamura

Takahiro Sonoda

A housing of a rotating electrical machine has a flow path extending in a rectangular wave shape along a circumferential direction, and including axial paths, and first and second circumferential paths joining first ends and second ends of the axial paths, respectively. The axial path includes joined first and second paths. A cross-section in each of the first and second paths decreases toward the other. A difference between the cross-sections at the first end and at the first circumferential path is not higher than a difference between the cross-sections at the first end and at a third end of the first path close to the second path. A difference between the cross-sections at the second end and at the second circumferential path is not higher than a difference between the cross-sections at the second end and at a fourth end of the second path close to the first path.

Rotating electrical machine and drive device

A stator includes: a stator core including teeth; pins including a working portion extending in an axial direction in a slot between the teeth; and bus bars electrically connected to the pins. In each slot, the working portions are disposed over stages in a radial direction. The pins include the two working portions disposed across the teeth, a first pin and a second pin each including a connection portion connecting the working portion in a circumferential direction, and a third pin connected to the bus bar. Each of the working portions of the second pin and the third pin is disposed in one of an outermost stage and an innermost stage of the slot. A number of teeth straddled by the second pin is smaller than a number of teeth straddled by the first pin.

Stator and motor

A stator includes a stator core, three-phase coils, three external terminals, and three busbars. Each of the three-phase coils has a first coil end protruding from the radially outermost side of a slot to a first side in the axial direction of the stator core. Each of the three bus bars includes a busbar body portion extending in a circumferential direction of the stator core, a busbar connection portion extending toward the first side in the axial direction, and an external terminal connection portion extending outward in the radial direction and connected to the external terminal. The first coil end extends in the radial direction through between the busbar body portion and the stator core in the axial direction, extends toward the first side in the axial direction on a radially outer side of the busbar body portion, and has a tip connected to the busbar connection portion from the radially outer side.

Stator, motor, and method for manufacturing stator

A stator includes: a stator core including teeth; pins including a working portion extending in an axial direction in a slot between the teeth; and bus bars electrically connected to the pins. In each slot, the working portions are disposed over stages in a radial direction. The pins include the two working portions across the teeth, first and second pins each including a connection portion connecting the working portion in a circumferential direction, and a third pin connected to the bus bar. The working portion of the second pin is disposed on one of the outermost and innermost stages of the slot, and the working portion of the third pin is disposed on one or the other of the outermost and innermost stages of the slot. A number of teeth straddled by the second pin is larger by two than a number of teeth straddled by the first pin.

A drive device includes a motor including a rotor rotatable about a central axis, a transmission connected to the motor, and a housing including a motor housing accommodating the motor and a transmission housing accommodating the transmission. A first fluid is accommodated in the transmission housing. The housing includes a first flow path through which the first fluid flows and a second flow path through which the second fluid flows. The first flow path includes a supply flow path that supplies the first fluid in the transmission housing to the inside of the motor housing, and a collection flow path that extends from the inside of the motor housing to the inside of the transmission housing. At least a portion of the second flow path is located radially outside the motor. At least a portion of the collection flow path is located radially outside the second flow path.

Drive device

A transmission housing of a drive device is fixed to one side in an axial direction of a motor housing that includes a first housing and a second housing fixed to another side in the axial direction of the first housing. The transmission housing includes a third housing fixed to the first housing and a fourth housing fixed to one side in the axial direction of the third housing. A bolt fixing the first and second housings passes through a through-hole of the second housing from the another side in the axial direction, and is fixed to a bolt hole of the first housing. A bolt fixing the second and third housings passes through a through hole of the first housing from the another side in the axial direction, and is fixed to a bolt hole of the third housing.

Growing community of inventors

Kyoto, Japan

Hibiki Takada