A motor stator includes a plurality of stacked annular stator laminates defining a stator core having an inner circumference, an outer circumference, a plurality of stator teeth on the inner circumference, and a plurality of ears extending outward from the outer circumference with a respective bolt hole defined in each ear. A first set of the stator laminates includes a plurality of coolant openings therethrough, wherein the coolant openings of adjacent stator laminates communicate with one another in order to define cooling channels inside the stator core. A second set of the stator laminates each include one or more generally radially extending first openings therethrough, wherein the first openings of adjacent stator laminates communicate with one another to define one or more first radial channel segments inside the stator core for providing radial coolant flow between one or more bolt holes and one or more cooling channels.

An electric machine for an electrified vehicle includes a stator core configured to receive a plurality of windings. The stator core including a plurality of interchangeable stacked laminations arranged in sub-stacks. The sub-stacks having an outer diameter surface divided into circumferential quadrants, each quadrant having a cutout extending inwardly at a predetermined depth and radial position to define a serpentine cooling path on the outer surface of at least a portion of the sub-stacks. The sub-stacks are circumferentially rotated relative to each other such that two quadrants have a first cutout orientation, and the two other quadrants have a second cutout orientation, the first cutout orientation is different than the second cutout orientation and when rotated in sequence each cutout aligns to form the continuous serpentine cooling path in a quadrant of the stator core.

An electric machine for an electrified vehicle includes a stator core configured to receive a plurality of windings. The stator core including a plurality of interchangeable stacked laminations arranged in sub-stacks. The sub-stacks having an outer diameter surface divided into circumferential quadrants, each quadrant having a cutout extending inwardly at a predetermined depth and radial position to define a serpentine cooling path on the outer surface of at least a portion of the sub-stacks. The sub-stacks are circumferentially rotated relative to each other such that two quadrants have a first cutout orientation, and the two other quadrants have a second cutout orientation, the first cutout orientation is different than the second cutout orientation and when rotated in sequence each cutout aligns to form the continuous serpentine cooling path in a quadrant of the stator core.

Stator housing for an electrical machine having an inlet and outlet for a cooling fluid, and a cooling duct formed between the inlet and the outlet through which the cooling fluid flows in a direction from the inlet to the outlet, is disclosed. The cooling duct has a first and a second heat transfer arrangement, which each extend along the direction of flow and are designed to transfer heat from the cooling fluid to the stator housing. The first heat transfer arrangement is arranged in a first section of the cooling duct and the second is arranged in a second section that is on the inlet side with respect to the first section. The first heat transfer arrangement in the first section creates a larger heat transfer area for the cooling fluid per unit of length based on the direction of flow than the second in the second section.

Stator housing for an electrical machine having an inlet and outlet for a cooling fluid, and a cooling duct formed between the inlet and the outlet through which the cooling fluid flows in a direction from the inlet to the outlet, is disclosed. The cooling duct has a first and a second heat transfer arrangement, which each extend along the direction of flow and are designed to transfer heat from the cooling fluid to the stator housing. The first heat transfer arrangement is arranged in a first section of the cooling duct and the second is arranged in a second section that is on the inlet side with respect to the first section. The first heat transfer arrangement in the first section creates a larger heat transfer area for the cooling fluid per unit of length based on the direction of flow than the second in the second section.

A system and method of active endturn cooling of an electric motor of a vehicle is provided. The method comprises providing a motor having a coolant nozzle and a cam, and measuring speed, lateral acceleration, and road tilt angle of coolant due to road tilt. The method further comprises calculating coolant angle and coolant acceleration angle based on the road tilt angle and the lateral acceleration if the speed is greater than zero. The method further comprises comparing the coolant angle with a critical angle. The method further comprises calculating a first control angle and a first coolant distance based on the road tilt angle and the lateral acceleration of the vehicle if the acceleration angle is greater than the critical angle. The method further comprises determining a cam position based on the first control angle. The method further comprises moving the cam to the position to move the nozzle and compensate for the lateral acceleration such that coolant drops within a target area of the motor.

A system and method of active endturn cooling of an electric motor of a vehicle is provided. The method comprises providing a motor having a coolant nozzle and a cam, and measuring speed, lateral acceleration, and road tilt angle of coolant due to road tilt. The method further comprises calculating coolant angle and coolant acceleration angle based on the road tilt angle and the lateral acceleration if the speed is greater than zero. The method further comprises comparing the coolant angle with a critical angle. The method further comprises calculating a first control angle and a first coolant distance based on the road tilt angle and the lateral acceleration of the vehicle if the acceleration angle is greater than the critical angle. The method further comprises determining a cam position based on the first control angle. The method further comprises moving the cam to the position to move the nozzle and compensate for the lateral acceleration such that coolant drops within a target area of the motor.

Systems are provided for an electronic drive unit. In one example, the electronic drive unit comprises a cooling passage integrally arranged therein, wherein the cooling passage is sealed via laminations of the stator. The laminations are further shaped to jet oil from the cooling passage onto end-windings.

Systems are provided for an electronic drive unit. In one example, the electronic drive unit comprises a cooling passage integrally arranged therein, wherein the cooling passage is sealed via laminations of the stator. The laminations are further shaped to jet oil from the cooling passage onto end-windings.

A stator and a motor including a stator. The stator includes a stator hub, a plurality of stator teeth extending from the stator hub that define a stator slot having a stator slot base, at least one winding disposed in the stator slot, and one or more oscillating heat pipes disposed at least partially in the at least one winding. The at least one winding is held apart from the stator slot base so that a cooling channel is defined between an inner winding portion of the at least one winding and a portion of the one or more oscillating heat pipes is disposed in the channel so cooling fluid can be passed between the stator slot base and the inner winding portion to cool the inner winding portion via at least operation of the one or more oscillating heat pipes.