An electric machine and method for cooling an electric machine Abstract There is disclosed an electric machine comprising a rotatable shaft comprising an axial channel with a first diameter D1 for receiving cooling fluid; a rotor, arranged to receive the shaft and to be fixedly connected to the shaft; a stator, arranged for mounting over the rotor; wherein the shaft comprises at least one first radial outlet at a first end, and at least one second radial outlet at a second end for allowing cooling fluid to be supplied towards the stator, wherein the channel has a dam section extending from the first end to the second end of the shaft having a second diameter D2 larger than the first diameter D1.

An electric machine and method for cooling an electric machine Abstract There is disclosed an electric machine comprising a rotatable shaft comprising an axial channel with a first diameter D1 for receiving cooling fluid; a rotor, arranged to receive the shaft and to be fixedly connected to the shaft; a stator, arranged for mounting over the rotor; wherein the shaft comprises at least one first radial outlet at a first end, and at least one second radial outlet at a second end for allowing cooling fluid to be supplied towards the stator, wherein the channel has a dam section extending from the first end to the second end of the shaft having a second diameter D2 larger than the first diameter D1.

A stator includes: a stator core including a plurality of stator teeth in a circumferential direction with respect to a center of rotation of a rotary electric machine; a stator coil disposed on a bottom portion side of each of a plurality of stator slots formed between the stator teeth; and a stator magnet disposed on an opening side of each of the plurality of stator slots and having the same polarity in a radial direction. In each of the stator slots, a plate-shaped fixing member is provided between the stator coil and the stator magnet so as to be fitted to opposed two wall surfaces of the stator slot, and a magnetic body is provided between the stator coil and the stator magnet.

A stator includes: a stator core including a plurality of stator teeth in a circumferential direction with respect to a center of rotation of a rotary electric machine; a stator coil disposed on a bottom portion side of each of a plurality of stator slots formed between the stator teeth; and a stator magnet disposed on an opening side of each of the plurality of stator slots and having the same polarity in a radial direction. In each of the stator slots, a plate-shaped fixing member is provided between the stator coil and the stator magnet so as to be fitted to opposed two wall surfaces of the stator slot, and a magnetic body is provided between the stator coil and the stator magnet.

A thermal management system for an electrical machine. The thermal management system has a housing circumferentially enclosing a bushing that has a tubular section. At least one fluid channel for a thermal medium is formed by channel walls within the housing and the bushing. A gap is provided or located between the tubular section of the bushing and the channel walls of the housing. The tubular section closes the at least one fluid channel off against a stator of the electrical machine, enabling a heat transfer between the stator and the thermal medium in the at least one channel across the tubular section of the bushing.

An electric machine having a hybrid insulative-conductive manifold is disclosed. In one aspect, an electric machine includes a manifold that includes an insulative plate and a conductive backplate positioned adjacent to the insulative plate. The insulative plate and the backplate define a first channel and a second channel therebetween. The electric machine also includes a prime winding and a secondary winding electrically isolated from the prime winding. The prime winding and the secondary winding are both in fluid communication with the first channel and the second channel. A terminal conductor extends through the backplate and insulative plate and is electrically coupled with the prime winding. The terminal conductor is electrically isolated from the backplate and provides cooling fluid to the prime winding and the first channel so that cooling fluid flows between the terminal conductor and the prime winding and between the terminal conductor and the first channel.

The invention relates to a drive unit (1) with a housing (2), an electric motor (3) arranged therein, a transmission (8) coupled to the electric motor (3), at least two oil chambers (15, 16) arranged in the housing (2), which have oil zones (20, 21) and air zones (22, 23) and in which the oil zones (20, 21) are flow-connected to one another by an overflow channel (18). A pump (14) is flow-connected on its suction side with an oil zone (20) and passes oil through the oil chambers (15, 16). A pressure-equalization channel (30) opens into the air zones (22, 23) and flow-connects them to one another.

The invention relates to a drive unit (1) with a housing (2), an electric motor (3) arranged therein, a transmission (8) coupled to the electric motor (3), at least two oil chambers (15, 16) arranged in the housing (2), which have oil zones (20, 21) and air zones (22, 23) and in which the oil zones (20, 21) are flow-connected to one another by an overflow channel (18). A pump (14) is flow-connected on its suction side with an oil zone (20) and passes oil through the oil chambers (15, 16). A pressure-equalization channel (30) opens into the air zones (22, 23) and flow-connects them to one another.

A rotating electric machine includes a rotor rotatable about an axis, a stator, and a motor housing accommodating the rotor and the stator. The motor housing includes a refrigerant channel through which the refrigerant flows, and a pair of channel ports respectively located at both end portions of the refrigerant channel. The refrigerant channel includes a meander channel extending in a wave shape along the circumferential direction, and a pair of end channels connecting an end portion of the meander channel and a channel port. At least one of the end channels includes a first circumferential channel portion extending along the circumferential direction, a second circumferential channel portion extending along the circumferential direction and overlapping the first circumferential channel portion as viewed along the axis, and an axial channel portion extending along the axial direction and connecting the first circumferential channel portion and the second circumferential channel portion.

A rotating electric machine includes a rotor rotatable about an axis, a stator, and a motor housing accommodating the rotor and the stator. The motor housing includes a refrigerant channel through which the refrigerant flows, and a pair of channel ports respectively located at both end portions of the refrigerant channel. The refrigerant channel includes a meander channel extending in a wave shape along the circumferential direction, and a pair of end channels connecting an end portion of the meander channel and a channel port. At least one of the end channels includes a first circumferential channel portion extending along the circumferential direction, a second circumferential channel portion extending along the circumferential direction and overlapping the first circumferential channel portion as viewed along the axis, and an axial channel portion extending along the axial direction and connecting the first circumferential channel portion and the second circumferential channel portion.