Abstract: Various methods and systems are provided for a system for cooling an electric motor that includes a rotor shaft rotatably mounted inside a motor housing, a lamination stack integrally connected to the rotor shaft, an encoder-end balance plate integrally connected to a first end of the lamination stack and a first end of the rotor shaft, an output-end balance plate integrally connected to a second end of the lamination stack and a second end of the rotor shaft, an oil supply coupled to the output-end balance plate and the rotor shaft. A closed-looped coolant pathway is formed between the transmission, the rotor shaft, the encoder-end balance plate, the lamination stack, and the output-end balance plate.

Abstract: Methods and systems for cooling an electric motor are provided. An electric motor cooling system, in one example, includes a stator at least partially surrounding a rotor and an inner passage extending axially through the rotor and including an inlet and an outlet. The cooling system further includes an outer passage including an inlet in fluidic communication with the outlet of the inner passage and an outlet in fluidic communication with an inlet of the inner passage and a phase change material in the inner passage and the outer passage.

Abstract: Methods and systems for cooling an electric motor are provided. An electric motor system, in one example, comprises a rotor with a plurality of axial air conduits, a first balancing plate positioned on a first axial side of the rotor, the first balancing plate comprising an inlet air duct and an outlet air duct, and a second balancing plate positioned on a second axial side of the rotor, the second balancing plate comprising an inlet air duct and an outlet air duct. In the electric motor system, the inlet air duct in the first balancing plate is radially offset from the inlet air duct in the second balancing plate.

Abstract: Methods and systems are provided for a cooling jacket for an electric motor. In one example, a system may include a channel extending along a circumference of an inner surface of the cooling jacket between an inlet and an outlet of the cooling jacket. A cross-section of the channel may gradually change from the inlet to the outlet along the circumference in order to compensate an increase in coolant temperature by an increase in convective heat transfer such that cooling is balanced around a circumferential surface of the electric motor.

Abstract: A cooling jacket surrounding the stator of an electric machine, having an inlet and a plurality of outlets disposed at ends of the cooling jacket, distributed in circumferential direction and configured to create liquid jets exiting the cooling jacket in a radial direction towards end windings at the axial ends of the machine. Coolant liquid flow guiding elements within the cooling jacket are configured so as to create a circumferentially homogeneous or more homogenous axial liquid flow towards the liquid outlets and/or towards the liquid jet devices.

Abstract: A stack of laminations for a stator of an electric machine, wherein each lamination comprises a plurality of teeth, and a plurality of holes, wherein the laminations are aligned relatively to one other such that the teeth form winding spaces for receiving stator windings, and the holes form at least one axially extending cooling channel inside the stack, wherein adjacent holes of at least two adjacent laminations are geometrically different.

Abstract: An electric motor cooling jacket enclosing a surface of an electric motor stator and having protuberances adapted for contact with the surface of the stator, with fluid passageways formed by the cooling jacket body, the protuberances, and the surface of the electric motor stator, wherein the fluid passageways are arranged to permit a cooling fluid to flow in a serpentine path across the surface of the stator to remove heat from the stator. Spray rings are fluidly coupled with the fluid passageways so as to permit the cooling fluid to flow into the fluid passageways, across the outer circumference of the electric motor stator, and out from orifices in the spray rings to cool the windings of the stator. The protuberances are formable using a pair of mold halves aligned anti-symmetrically with one another so that a serpentine fluid path is formed when casting the cooling jacket body.