A remotely adjustable orifice plate arrangement for a generator is provided. The arrangement includes an enclosed generator with an interior wall including an orifice through which a fluid flows. The arrangement also includes a first plate including an orifice and a remotely controllable motor. The first plate is coupled to the interior wall within a flow area of the generator such that at least a portion of the orifice overlaps the orifice of the interior wall. The arrangement also includes an adjustable orifice plate including an orifice wherein the adjustable orifice plate slides relative to the first plate to determine the size of a resultant orifice of the interior wall. The motor selectively controls the slideable movement of the adjustable orifice plate relative to the first plate and is controlled remotely from outside the enclosed generator. A method to remotely adjust fluid flow within an enclosed generator is also provided.

A marine drive is for propelling a marine vessel in a body of water. The marine drive comprises a motor housing defining a motor cavity; a motor disposed in the motor cavity; a propulsor shaft extending from the motor housing, wherein the motor is configured to cause rotation of the propulsor shaft; a propulsor which is rotated by the propulsor shaft to create a thrust force in the body of water; and a vent conduit having a first end connected to the motor cavity and a second end which vents the motor cavity to atmosphere.

Systems for preventing leakage of coolant in an electric motor cooling system. In one example, a sealing ring configured with a stator seal may be integrated as part of a sealing assembly of a cooling system. The sealing ring includes a flange, a plurality of channels that is positioned radially on the sealing ring, a plurality of notches, a plurality of surface grooves, an elevated region that are configured with anchors that retain the seal, a depressed region wherein a plurality of retention posts is positioned therein, a peripheral groove positioned on a peripheral edge of the sealing ring and spaced between two sides of the sealing ring, and wherein the seal is integrated with an inner edge of the sealing ring and extends from the inner diameter to the elevated region of the sealing ring.

A motor cooling device includes: an oil passage, provided in a stator formed by laminating a plurality of steel plates, serving as a conduit for a cooling oil. Further, the oil passage is formed by a plurality of oil holes, which are formed in the steel plates and are overlapping with each other in a laminating direction of the steel plates, and the oil passage is formed by an offset collision wall formed by shifting the oil holes in a direction orthogonal to the laminating direction and overlapping the oil holes.

Provided are a motor cooling system and a motor cooling method. The motor cooling system and the motor cooling method using the same may secure improved motor efficiency and output by further lowering a temperature of a drive motor cooling oil by establishing a system that achieves an improved cooling effect by changing a medium for lowering the oil temperature from an inverter or integrated charging control unit (ICCU) coolant to a refrigerant used for cooling a coolant of a battery.

Presented are electric machines with rotor shaft-mounted heat pipes/vapor chambers thermally coupled to endcap-integrated heat sinks, methods for making/using such machines, and vehicles equipped with such machines. An electric machine includes an outer housing, a stator assembly mounted to the housing, and a rotor assembly rotatably mounted adjacent the stator assembly. The stator assembly includes one or more stator windings mounted to an annular stator core. The rotor assembly includes one or more electromagnetic rotor windings mounted to a cylindrical rotor core. A rotor power transfer circuit (PTC) is electrically connected to the rotor assembly to electrify the rotor winding(s). A rotor shaft is attached to the rotor core to rotate in unison therewith. One or more heat pipes are mounted on the rotor shaft's outer surface and project axially between the rotor PTC and rotor core. Each heat pipe passively extracts and transfers thermal energy from the rotor PTC.

An electric drive system includes a permanent magnet motor, rotor magnets connected to a rotor thereof, a heating source such as a resistive heating element connected to the rotor magnets, and an electronic controller. The controller selectively heats the rotor magnets via the heating source during a predetermined low-load/high-speed operating mode of the electric drive system. The controller may preemptively cool the rotor magnets, e.g., via pre-chilled electrical coolant, in response to a predicted or impending high-load/low-speed operating mode. The heating element may include a positive temperature coefficient heating element disposed between a rotor yoke and the rotor magnets. A method includes detecting the low-load/high-speed operating mode, and selectively heating the rotor magnets via a heating source during such a mode. A motor vehicle includes road wheels and the electric drive system, the motor of which powers one or more of the road wheels.

A compressor assembly includes a compressor assembly housing, a motor that drives one or more compressor rotors, an oil reservoir, an oil cooler, and an oil filter. The motor has a motor jacket with first group channels for cooling the motor, and the compressor assembly housing having one or more pass-through channels forms at least a part of an oil line that interconnects components of the compressor assembly.

A marine drive is for propelling a marine vessel in a body of water. The marine drive comprises a motor housing defining a motor cavity; a motor disposed in the motor cavity; a propulsor shaft extending from the motor housing, wherein the motor is configured to cause rotation of the propulsor shaft; a propulsor which is rotated by the propulsor shaft to create a thrust force in the body of water; and a vent conduit having a first end connected to the motor cavity and a second end which vents the motor cavity to atmosphere.

A rotor assembly for an inductively electrically excited synchronous machine may include a hollow shaft, a rotor connected to the hollow shaft, and a secondary-side circuit of an energy transmitter. The secondary-side circuit may be arranged in a rotationally fixed manner in the rotor assembly. The secondary-side circuit may include a rectifier. The rectifier may include a printed circuit board and at least one electrical component part fastened to the printed circuit board and a secondary coil. The rectifier may be aligned transversely to an axis of rotation of the hollow shaft and may be arranged in a rotationally fixed manner in a cavity of the hollow shaft. The rectifier may include a cooling body abutting against the printed circuit board such that the cooling body faces away from the at least one electrical component part and transmits heat.