A motor assembly has an outer stator (40), a rotor assembly (30), a separating can (50), and a first bearing (36) and a second bearing (37). The rotor assembly (30) has an inner rotor (32) and a shaft (31) and defines an axial direction (77) and a radial direction (78) of the motor assembly (20). The motor assembly (20) has a magnetic air gap (53) between the outer stator (40) and the inner rotor (32). The separating can (50) has a split tube component (51) and a separating can base part (52). The split tube component (51) has a split tube section (54). The split tube section (54) extends through the magnetic air gap (53). The outer stator (40) is arranged around the split tube section (54). The split tube section (51) and the separating can base part (52) overlap in a first predefined axial region (55). A seal (60) is provided between the split tube section (51) and the separating can base part (52) in the first predefined axial region (55).

A motor includes a housing including a housing base and a housing shaft portion that is provided on the housing base and extends in a direction along a rotation center axis, a motor stator that is disposed outward in a radial direction of the housing shaft portion, a motor rotor that is provided between the motor stator and the housing shaft portion, a bearing that is provided inward in a radial direction of the motor rotor and rotatably supports the motor rotor to the housing shaft portion, a sealing structure that is provided on an opposite side to the housing base in an axial direction of the motor rotor and seals between the motor rotor and the housing shaft portion, and a resolver that is configured to detect rotation of the motor rotor.

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 canned electric motor for a fluid pump. The canned electric motor includes a static motor frame, a rotor shaft, a rotatable motor rotor which is co-rotatably connected with the rotor shaft, a static motor stator having a stator body which is directly fixed to the static motor frame, and a separating can which fluidically separates the static motor stator from the rotatable motor rotor. The separating can has a first axial support which protrudes radially from an outside of the separating can. The separating can is supported in a first axial direction by the stator body via the first axial support and in a second axial direction by the static motor frame. The first axial direction is opposite to the second axial direction.

A motor-driven compressor includes an inverter and a housing. The inverter includes three-phase switching elements and a holder that retains the switching elements. The holder is fixed to the housing with fastening members and is configured to push the three-phase switching elements toward a heat dissipating surface of the housing. The three-phase switching elements are arranged along a line segment that connects two of the fastening members. The holder includes a first accommodating portion that accommodates one of the three-phase switching elements that is located in the middle, and two second accommodating portions that respectively accommodate two of the three-phase switching elements that are located at opposite ends. Each of the two second accommodating portions includes a tongue-shaped contact portion that contacts the corresponding switching element. The contact portions are configured to be deformed to reduce a pushing force of the holder acting on the switching elements.

An electric pump includes a stator assembly. The stator assembly includes a stator core and a winding. The winding includes a main body section, a first section, and a second section. The stator core includes a core tooth portion, a core yoke portion, and a core neck portion. A first reference plane is defined, which coincides with a center axis line of the core tooth portion in an axial direction thereof and a center axis line of the core neck portion in an axial direction thereof. In a cross section of the stator assembly along the first reference plane, an upper end of the main body section is level with an upper end of a main body portion of the core yoke portion, and a lower end of the main body section is level with a lower end of the main body portion of the core yoke portion.

According to an aspect of the present disclosure, a rotor assembly includes a rotor core having a through-hole disposed at a central portion thereof along an axial direction of the rotor core, and a rotor shaft that passes through the through-hole and coupled to the rotor core, the rotor shaft includes a shaft body having a hollow portion in an interior thereof, a cooling fluid hole part including a plurality of cooling holes passing through the shaft body to discharge a cooling fluid introduced through the hollow portion to an outside of the shaft body and arranged to be spaced apart from each other along an axial direction of the shaft body, and a support flange protruding radially on an outer surface of the shaft body to restrain axial movement of the rotor core and having a passage communication hole.

According to an aspect of the present disclosure, a rotor assembly includes a rotor core having a through-hole disposed at a central portion thereof along an axial direction of the rotor core, and a rotor shaft that passes through the through-hole and coupled to the rotor core, the rotor shaft includes a shaft body having a hollow portion in an interior thereof, a cooling fluid hole part including a plurality of cooling holes passing through the shaft body to discharge a cooling fluid introduced through the hollow portion to an outside of the shaft body and arranged to be spaced apart from each other along an axial direction of the shaft body, and a support flange protruding radially on an outer surface of the shaft body to restrain axial movement of the rotor core and having a passage communication hole.

A cooling system cools an electric machine including a casing, a rotor rotatably supported by the casing, and a stator fixed to the casing. The cooling system includes a flow circuit that brings a cooling liquid into contact with active parts of the electric machine. A main reservoir is provided in a lower portion of the casing. A pump injects the cooling liquid into the flow circuit. The level of cooling liquid in the casing interfaces with a lower portion of the rotor when the pump stops. A controller controls the pump to stop the pump when a temperature of the cooling liquid is below a given threshold, and start the pump as soon as the temperature of the liquid reaches the threshold such that the liquid is drawn by the main reservoir pump towards a secondary reservoir to lower the level of cooling liquid in the casing.