Methods and systems are provided for an electric drivetrain. In one example, the electric drivetrain system includes a first and a second electric motor-generator rotationally coupled to a planetary assembly that is rotationally coupled to a drive axle via an output gear. The system further includes a controller that is configured to, during a first operating condition, operate each of the first and second electric motor-generators in a motor mode or a generator mode and hold the output gear at a zero speed.

A battery pack including a first subset of battery cells and a second subset of battery cells, set of switches, a DC output port and an AC output port. The battery pack may provide both a DC output signal at the DC output port and an AC output signal at the AC output port by selectively activating the switches of the set of switches. The battery pack may couple the first subset of battery cells and the second subset of battery cells in a parallel configuration or a series configuration.

An electric machine including a distributed cooling system is disclosed. The electric machine includes a housing, a stator assembly, a rotor assembly, and a distributed cooling system. The distributed cooling system comprising at least one inlet, a first passage, a second passage, and a third passage. The first passage extending axially in a first direction through at least a portion of the rotor shaft to direct a flow of coolant in the first direction. A second passage fluidly coupled to the first passage extending in a second direction through at least a portion of the rotor shaft between a receiving end and a distributing end. At least one third passage fluidly coupled to the second passage extending between a first end and a second end and distributes coolant received from the second passage to at least one of the first end or the second end into the stator assembly.

An electric-power conversion apparatus has a heat sink in which one side portion out of a pair of side portions that extend in a direction perpendicular to the axial direction of a motor is formed shorter than the other side portion thereof; a lower case to which the heat sink is fixed is fastened to a driving apparatus through the intermediary of fixing portions at the both end portions of each of the pair of side portions of the heat sink or at respective positions in the vicinity of the both end portions of each of the pair of side portions of the heat sink; at least one of a reactor and capacitors is disproportionately disposed to be closer to said one side portion than to said the other side portion of the heat sink.

A rotary electric machine includes a rotor and a stator. The stator has windings and teeth extending radially from a stator core. Each tooth is separated from an adjacent tooth by a stator slot that opens to a radial stator-rotor airgap via a slot opening. The windings are positioned within each slot. Each stator tooth has a tooth tip with a surface profile configured to guide rotor flux away from areas of the windings proximate the respective slot opening. The tip surface profile may be a concave region, e.g., a dent/chamfer, and/or a convex region, e.g., a bump/bulge, and is formed in a distal end surface of the tip proximate the opening. The stator-rotor airgap is smaller at the convex region and larger at the concave region than elsewhere along the distal end surface. An electrical system includes the machine, a battery, and a power inverter module.

Provided is a vehicle power device including: an inner ring as a fixed ring, an outer ring as a rotary ring which is an outer ring rotation, and a bracket a knuckle for fixing an inboard side end portion of the inner ring removably with the electric motor disposed. The electric motor is of an outer rotor motor type, and the bracket includes a bracket base portion and a bracket cylindrical portion, the bracket base portion for being attached to the knuckle and fixed to the inner ring, the bracket cylindrical portion which extends from the bracket base portion toward an outboard side is located on an outer periphery of the outer ring via a radial gap and is provided with a stator disposed on an outer peripheral surface. The rotor of the electric motor is removably attached to the wheel mounting flange via a rotor casing.

Provided is a vehicle power device (1) including: a wheel bearing (2); and a driving motor (3) that can rotationally drive an outer ring (4) as a rotary ring. The vehicle power device further includes a bracket (24) attached to a knuckle (8) of a vehicle. The bracket (24) includes a bracket base portion (24a) and a bracket cylindrical portion (24b), the bracket base portion interposed between the knuckle (8) and an inner ring (5) wherein the inner ring (5) is removably fixed, the bracket cylindrical portion (24b) extending from the bracket base portion (24a) toward an outboard side. The driving motor (3) includes a stator (18) removably attached to an inner periphery of the bracket cylindrical portion (24b) and a rotor (19) attached to the outer ring (4) on an inner periphery of the stator (18).

A method for constructing a rotor assembly for use with a rotary electric machine includes forming annular rotor laminations from metal blanks. Each lamination has a radial axis and an outer diameter surface. Multiple magnet web regions are defined in proximity to the outer diameter surface. Each web regions includes asymmetrical openings defined by a radially-extending strut and arcuate peripheral bridges. The method includes coaxially stacking the laminations into a rotor stack, including positioning every other lamination a predetermined angular distance with to unmask the bridges and/or struts and mask remaining surface area of the laminations. The rotor stack is subjected to a heat-treating process to harden only the unmasked bridges and/or struts. The method includes connecting a rotor shaft to the stack to construct the rotor assembly, with the web regions corresponding to a respective rotor magnetic pole.

A rotor assembly for a hybrid module includes a rotor carrier, a rotor segment, an end ring, a first spacer, a second spacer, and a compressed spring. The rotor carrier includes a first outer cylindrical surface and a radial surface, and the rotor segment is installed on the first outer cylindrical surface. The end ring is fixed to the rotor carrier and arranged for fixing to an engine flexplate. The first spacer is disposed axially between the rotor segment and the radial surface, and the second spacer is disposed axially between the rotor segment and the end ring. The compressed spring is disposed axially between the end ring and the second spacer to press the first spacer, the second spacer, and the rotor segment against the radial surface for frictional torque transmission between the rotor segment and the rotor carrier.

A hybrid module includes a housing with a bulkhead wall, a K0 shaft, a rotor assembly, a rotor carrier and a first bearing. The K0 shaft is arranged for driving connection with a crankshaft. The rotor assembly has an electric motor rotor and a thrust surface for a K0 clutch. The K0 clutch is arranged to drivingly connect the rotor assembly to the K0 shaft. The rotor carrier is fixed to the rotor assembly and the first bearing is arranged to rotationally separate the bulkhead wall and the rotor carrier. In an example embodiment, the first bearing is a deep groove ball bearing. In an example embodiment, the hybrid module includes a seal installed in the bulkhead wall and contacting the K0 shaft. In an example embodiment, the hybrid module includes a bushing installed on the K0 shaft and arranged for contacting an inner bore of the crankshaft.