Abstract: Systems and methods for cooling an electric machine. The stator cooling system includes, in one example, multiple coolant channels arranged in a stator lamination stack or between an outer diameter of a coolant jacket and an inner diameter of a housing and multiple turbulators arranged the multiple coolant channels. The stator cooling system further includes a coolant inlet configured to deliver a coolant to multiple coolant channels and a coolant outlet configured to receive the coolant from the multiple coolant channels.

Abstract: Various methods and systems are provided for thermal management of an electric motor via a coolant flow around portions of the electric motor, where the coolant flow is disrupted by an arrangement of pin-fins. In one example, an electric motor comprises: a casing including a coolant inlet arranged opposite to a coolant outlet across a central axis of the electric motor; a stator housed within the casing and forming a plurality of pin-fins extending straight outward radially, relative to the central axis, from outer circumferential surfaces of the stator in a staggered arrangement around an entire perimeter of the stator; and a plurality of clearances formed between adjacent pin-fins of the plurality of pin-fins, the plurality of clearances adapted to flow a coolant from the coolant inlet to the coolant outlet.

Abstract: Methods and systems are provided for operating an electric motor including multiple rotor and stator sections. In one example, a system may include the multiple rotor sections configured to be mechanically coupled and decoupled from each other concurrently with multiple stator sections configured to be electrically coupled and decoupled from each other, within certain regimes of operation of the electric motor.

Abstract: Systems and methods for cooling an externally excited electric machine. An externally excited electric machine cooling system, in one example, includes rotor windings positioned radially outward from a rotor shaft and including a plurality of gaps between metal wire bundles. The externally excited electric machine cooling system further includes a cooling device positioned in the plurality of gaps and configured to directly cool the rotor windings.

Abstract: Methods and systems for an electric drive unit. The electric drive unit includes, in one example, a stator assembly with a first set of stator windings and a second set of stator windings, a first set of rotors each configured to electromagnetically interact with the first set of stator windings and rotationally couple to a distinct gear in a first summation gear set. The electric drive unit further includes a second set of rotors configured to electromagnetically interact with the second set of stator windings and rotationally couple to a distinct gear in a second summation gear set. The electric drive unit further includes a first inverter and a second inverter both electrically coupled to the stator assembly and in the drive unit the first inverter and the second inverter are configured to independently control speeds of the first set of rotors and the second set of rotors, respectively.

Abstract: Methods and systems for an electric drive unit. The electric drive unit includes, in one example, a stator assembly with a first set of stator windings and a second set of stator windings, a first set of rotors in which each rotor is configured to electromagnetically interact with the first set of stator windings and rotationally couple to a distinct gear in a first summation gear set, a second set of rotors in which each rotor is configured to electromagnetically interact with the second set of stator windings and rotationally couple to a distinct gear in a second summation gear set. The electric drive unit further includes a disconnect clutch configured to rotationally disconnect a first rotor in the first set of rotors from the first summation gear set.

Abstract: Systems and methods for electric machine cooling. The electric machine, in one example, includes a rotor that includes an outer circumferential surface with one or more spiral grooves, a stator that circumferentially surrounds the rotor and includes end windings, and an air passage radially extending from the stator to an air gap between the stator and the rotor. The electric machine further includes a cooling assembly configured to spray a coolant towards the end windings.

Abstract: Methods and systems for an electric machine. The electric machine includes, in one example, a stator with end windings and a stator core and a cooling assembly with a spray ring that is directly coupled to an axial face of the stator core. In the electric machine, the spray ring is configured to spray a coolant at the end windings and includes a first section that extends down the axial face of the stator core and a second section that extends axially away from the stator core.

Abstract: Methods and systems are provided for an electric axle in a vehicle. The electric axle comprises an electric motor having a stator and a rotor, a coolant manifold mounted to an end plate of the rotor, wherein the coolant manifold is configured to flow coolant to rotor coolant lines extending axially through the rotor, and a spray ring comprising coolant lines coupled to the coolant manifold, wherein coolant flowing from the coolant manifold to the spray ring flows in a direction angled to an axial direction, wherein the spray ring is positioned circumferentially about axial stator end windings.

Abstract: Methods and systems are provided for an electric axle in a vehicle. An electric axle comprises an electric motor having a stator and a rotor, a coolant manifold mounted to an end plate of the rotor, wherein the coolant manifold is configured to flow coolant to rotor coolant lines extending axially through the rotor, and a first spray ring arranged adjacent to the coolant manifold and a second spray ring arranged distally to the coolant manifold, wherein the first spray ring receives coolant from the coolant manifold via an interior passage and the second spray ring receives coolant from the coolant manifold via an outer passage.

Abstract: Methods and systems are provided to cool an electric machine rotor. The electric machine fluid cooling system includes, in one example, one or more air vents in fluidic communication with one or more radial cooling passages of a rotor shaft. In the system, the radial cooling passages are in fluidic communication with one or more rotor shaft cooling passages that extend through the rotor shaft and an inlet cooling passage.

Abstract: Systems are provided for an electric motor. In one example, the electric motor includes a stator comprising a coolant passage shaped in stator laminations. The coolant passage is non-linear and configured to flow coolant in two or more planes.

Abstract: An electromagnetic propulsion unit for a land-based wheeled or tracked vehicle is provided. The propulsion unit includes a balancing plate assembly with an outer plate designed to couple to a rotor assembly. In the balancing plate assembly, the outer plate includes a lip that, during rotor assembly rotation, pumps one or more fluids from an air gap formed between the rotor assembly and a stator and the outer plate is constructed out of a non-electrically conductive material.

Abstract: An electromagnetic propulsion unit for a land-based wheeled or tracked vehicle is provided. The propulsion unit includes a rotor stack, a rotor shaft, and a balancing plate assembly. The balancing plate assembly include a base plate fixating the rotor stack to the rotor shaft, where the base plate includes an air channel that axially extends through the base plate and a planar channel formed between the rotor stack and the base plate and in fluidic communication with the air channel.

Abstract: 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.

Abstract: Methods and systems are provided to cool an electric machine rotor. The electric machine fluid cooling system includes, in one example, an air vent in fluidic communication with a radial coolant passage of a rotor shaft. In the system, the radial coolant passage is in fluidic communication with a rotor shaft coolant passage that extends through a rotor shaft and an inlet coolant passage that extends through a rotor shaft.

Abstract: Systems for removing excess coolant oil and air from a radial air gap between a stator and a rotor of an electric motor are provided. In one example, the systems may include a ring covering the radial air gap, the ring configured to route coolant out of the radial air gap via one or more channels.

Abstract: Systems are provided for a cooling system for an electric vehicle. In one example, a system includes a shaft assembly comprising a shaft, a shaft end cap, and an insert, wherein the insert is arranged in a cavity shaped by the shaft and the shaft end cap.

Abstract: An electric machine system is provided. The system includes a stack of a plurality of stator laminations with at least a portion of the plurality of stator laminations each including a plurality of holes that are arranged radially outward from a plurality of teeth, where the plurality of holes include a first set of holes, a second set of holes, and a third set of holes, where the first, second, and third sets of holes has a different profile and/or area, where the second set of holes are positioned radially inward from the third set of holes; and where a plurality of oil channels are formed by an alignment of holes in adjacent stator laminations in the portion of the plurality of stator laminations.

Abstract: The present disclosure relates to a transmission for a vehicle having a power source, the transmission comprising: an input member for receiving power from the power source; an output member for outputting power to at least one component of the vehicle; at least one power split gear set having a plurality of members and operatively connected between said input member and said output member; an electromagnetic variator having a stator, an outer rotor and an inner rotor; wherein the inner rotor is at least partially received in the outer rotor and the electromagnetic variator is configured to provide variable torque transmission ratios between the outer rotor and inner rotor; and wherein said first and second rotors are each operatively connectable to different ones of said members of said power split gear set and are each operatively connectable to the input member to be driven thereby.