In some examples, an electric machine system including an outer housing; a stator assembly within the outer housing; a corrugated ring located between the stator assembly and the outer housing, the corrugated ring defining a gap between the stator assembly and the outer housing; and a pump configured to transfer a fluid through the gap between the stator assembly and housing to remove heat from at least one of the stator assembly or outer housing.

Provided is a reactor in which it is possible to reduce molding failures in inner resin portions when molding the inner resin portions. A reactor includes: a coil having winding portions; and a magnetic core having inner core portions and outer core portions. The reactor further includes: inner resin portions that fill gaps between the winding portions and the inner core portions; and inner interposed members that are interposed between the winding portions and the inner core portions, and form resin flow paths. The inner interposed members have spacers arranged between the winding portions and the inner core portions. The spacers are provided with air discharge paths that are in communication with the resin flow paths, and extend in the axial direction of the winding portions to at least one end face side of the winding portions.

The cooling device is intended for an electric motor and has a rotor cooling flange and a stator cooling flange (2), of which one is rotatable with respect to the other. At least one of the two cooling flanges (2) is provided with cooling ribs (8) arranged distributed over its circumference. During operation of the electric motor, at least one of the two cooling flanges gives off heat to the surrounding air. At least some of the cooling ribs (8) of a heat-emitting cooling flange (2) have an undulating profile over their length. In this context, the surface area of a cooling rib (8) having an undulating profile is larger than the surface area of the associated straight reference rib.

An assembly may be provided that includes a controller configured to be coupled with at least one blower drive that operates a blower motor to cool resistive elements that dissipate electrical power as heat. The controller may be configured to determine whether the electrical power is no longer received by the resistive elements and operate the at least one blower drive to operate the blower motor to cool the resistive elements responsive to the electrical power no longer being received by the resistive elements.

This rotating electric machine comprises: a stator having a stator core around which a plurality of coils are wound; a rotor supported to be rotatable relative to the stator with a predetermined gap therebetween; a rotor case that holds the rotor; and a first bearing and a second bearing that rotatably support the rotor case. The rotating electric machine includes: a first flow path formation body that forms a first flow path through which a refrigerant flows to a coil end part protruding from the stator core; a first case part which forms an accommodation space of the first bearing, is connected to the first flow path of the first flow path formation body, and fills the accommodation space with the refrigerant; a second flow path formation body which forms a second flow path through which the refrigerant flows to a coil end part disposed on the opposite side from the coil end part in the axial direction; and a second case part which forms an accommodation space of the second bearing, is connected to the second flow path of the second flow path formation body, and fills the accommodation space with the refrigerant.

The present disclosure relates to an electric motor provided with liquid cooling means to avoid overheating. The electric motor includes a frame that develops along a longitudinal axis, a first and a second endshield connected at opposite ends of the frame, a stator assembly, and a rotor assembly, wherein the stator assembly is arranged, at least partially, in a longitudinal cavity of the frame and wherein the rotor assembly is arranged, at least partially, in a longitudinal space defined by the stator assembly and supported, at opposite ends, by the endshields so as to rotate about the longitudinal axis. The electric motor further includes liquid cooling means to dissipate the heat generated during the operation of the electric motor. The cooling means include a plurality of circulation channels defined through the frame for the circulation of a cooling fluid, and at least one hydraulic connecting channel.

A rotor shaft for an electric machine includes a rotor shaft main body and a rotor shaft core which is arranged therein and which is connected to the rotor shaft main body. The rotor shaft comprises a substantially axially running cooling cavity configured to conduct a cooling fluid, and the rotor shaft core is composed of a different material than the rotor shaft main body.

A supercritical cooling system and method increases a pressure of a cooling fluid in a cooling circuit to a pressure above a supercritical pressure of the cooling fluid. The cooling fluid is in a supercritical state at a temperature to which the cooling circuit is exposed. The cooling fluid is moved through the cooling circuit while the cooling fluid is in the supercritical state. A machine is cooled using the cooling fluid in the supercritical state while the cooling fluid moves in the cooling circuit.

An electric motor comprises: a motor housing, a stator connected to the motor housing, wherein the stator comprises first stator end-windings and second stator end-windings, a rotor rotatable relative to the stator, a driveshaft connected to the rotor in a rotationally fixed manner, wherein the driveshaft is rotatably supported in the motor housing about an axis of rotation, wherein an axial cooling arrangement is arranged axially adjacent and radially overlapping one of the first and second stator end-windings, wherein the axial cooling arrangement comprises a fluid chamber with a plurality of nozzles distributed in circumferential direction and directed towards said one of the first and second stator end-windings.

Electrical machine, e.g., a generator, having a stator comprising a winding overhang, a rotor arranged rotatable in the stator, and a heat exchanger fluidically connected to the winding overhang via a coolant shaft, which is arranged radially outside the winding overhang, runs at least partially approximately along a circumferential direction, and is delimited in a radial direction by an outer surface, so that the winding overhang can be cooled by a continuous flow of a fluid over the heat exchanger and the winding overhang. To obtain uniform cooling of the winding overhang, multiple guiding elements are arranged in a distributed manner along a circumferential direction in the coolant shaft to redirect a flow of a fluid oriented in a circumferential direction in the coolant shaft at least partially into a radial flow towards the winding overhang and to distribute the flow to multiple regions of the winding overhang.