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 rotary table includes a housing having a first groove, a second groove and a drainage channel connecting the first groove and the second groove, a motor, a shaft located in the housing and provided with a guide portion, and a leak detection belt set in an accommodation chamber in the housing and embedded in the second groove. In this way, if liquid enters the housing, the guide portion of the shaft guides the liquid into the first groove, so that the liquid reaches the second groove along the drainage channel. At this time, the leak detection belt can be used for leakage detection to protect key components.

A rotary table includes a housing having a first groove, a second groove and a drainage channel connecting the first groove and the second groove, a motor, a shaft located in the housing and provided with a guide portion, and a leak detection belt set in an accommodation chamber in the housing and embedded in the second groove. In this way, if liquid enters the housing, the guide portion of the shaft guides the liquid into the first groove, so that the liquid reaches the second groove along the drainage channel. At this time, the leak detection belt can be used for leakage detection to protect key components.

An electric machine (10) includes a housing (12), a stator (20) fixed within the housing (12), a rotor (30) with a rotor shaft (32), an air gap (24) formed between the rotor (30) and the stator (20), and a cooling device (14) configured for liquid cooling of the electric machine (10). The rotor shaft (32) defines an axial bore (36) in an axial direction, which extends at least partially into the rotor (30). The rotor (30) defines a radially extending air duct (40), which extends from an inner side (42) contacting the rotor shaft (30) to an outer side (44) facing the air gap (24). The rotor shaft (32) defines a bore (46), which is aligned with the air duct (40) such that air is flowable out of the rotor shaft (32) into the air gap (24).

An electric machine (10) includes a housing (12), a stator (20) fixed within the housing (12), a rotor (30) with a rotor shaft (32), an air gap (24) formed between the rotor (30) and the stator (20), and a cooling device (14) configured for liquid cooling of the electric machine (10). The rotor shaft (32) defines an axial bore (36) in an axial direction, which extends at least partially into the rotor (30). The rotor (30) defines a radially extending air duct (40), which extends from an inner side (42) contacting the rotor shaft (30) to an outer side (44) facing the air gap (24). The rotor shaft (32) defines a bore (46), which is aligned with the air duct (40) such that air is flowable out of the rotor shaft (32) into the air gap (24).

An in-wheel motor for a vehicle includes: a stator with a connector attaching the stator to the vehicle, the connector including a shaft, an end plate of a larger diameter than the shaft, and a coolant passage through the end plate, the stator further including a hollow stator body with cylindrical outer surface and mounted to the connector. Cooling channels for circulating liquid coolant extend along the hollow stator body and are in fluid connection with the coolant supply duct, the cooling channels having an inlet for supply of liquid coolant to the plurality of channels and an outlet for discharging liquid coolant from the plurality of channels; wherein, at a side opposite from the connector member, the hollow stator body has an open end with a diameter larger than the diameter of the shaft. Also disclosed is a cooling jacket for such an in-wheel motor.

An in-wheel motor for a vehicle includes: a stator with a connector attaching the stator to the vehicle, the connector including a shaft, an end plate of a larger diameter than the shaft, and a coolant passage through the end plate, the stator further including a hollow stator body with cylindrical outer surface and mounted to the connector. Cooling channels for circulating liquid coolant extend along the hollow stator body and are in fluid connection with the coolant supply duct, the cooling channels having an inlet for supply of liquid coolant to the plurality of channels and an outlet for discharging liquid coolant from the plurality of channels; wherein, at a side opposite from the connector member, the hollow stator body has an open end with a diameter larger than the diameter of the shaft. Also disclosed is a cooling jacket for such an in-wheel motor.

The invention relates to an electrical machine comprising a stator and a rotor that are disposed in a casing comprising a first face provided with ribs and intended to be in contact with a cooling fluid, the machine being provided with a closing structure which is fastened in a leaktight manner to the first face of the casing so as to delimit with the first face of the casing a space forming a circuit for the cooling fluid of the motor, the closing structure being fastened to the first face of the casing by welding and/or brazing and/or crimping and comprising at least one cover, characterized in that the closing structure is fastened to the casing by welding and/or brazing and/or crimping only at said ribs.

The invention relates to an electrical machine comprising a stator and a rotor that are disposed in a casing comprising a first face provided with ribs and intended to be in contact with a cooling fluid, the machine being provided with a closing structure which is fastened in a leaktight manner to the first face of the casing so as to delimit with the first face of the casing a space forming a circuit for the cooling fluid of the motor, the closing structure being fastened to the first face of the casing by welding and/or brazing and/or crimping and comprising at least one cover, characterized in that the closing structure is fastened to the casing by welding and/or brazing and/or crimping only at said ribs.

A gyroscopic roll stabilizer for a boat includes an enclosure mounted to a gimbal for rotation about a gimbal axis and configured to maintain a below-ambient pressure, and a flywheel assembly including a flywheel and flywheel shaft, with the flywheel assembly rotatably mounted inside the enclosure for rotation about a flywheel axis. The gyroscopic roll stabilizer also includes a motor operative to rotate the flywheel assembly and disposed inside the enclosure. A motor cooling circuit is configured to transfer heat away from the motor. The motor cooling circuit has a closed fluid pathway for recirculating cooling fluid therein. The fluid pathway includes a fluid channel jointly defined by the motor and the enclosure and having the cooling fluid therein. The gyroscopic roll stabilizer is configured to transfer heat away from the motor to the cooling fluid. Related methods are also disclosed.