Abstract: Provided is a motor cooling structure including: a motor housing having a hollow cylinder shape; a stator core accommodated in the motor housing, and including a plurality of concentric ring-shaped split cores stacked therein; and a cooling pipe receiving cooling fluid flowing from the outside, and providing cooling fluid to the stator core, wherein the split core includes a plurality of passage parts which are recessed in an outer circumference and through which the cooling fluid flows, and a plurality of press-fit parts protruding from the outer circumference, and the passage parts communicate with each other not to form a straight line when the plurality of split cores are stacked.

Abstract: An airgap cooling system (140) for an electric machine (100), the electric machine (100) including a rotor assembly (102) rotatably mounted within a stator assembly (120) and defining an airgap (130) therebetween, wherein the stator assembly (120) comprises a lamination stack (124). The airgap cooling system (140) includes a plurality of distribution passages (142) that extend through the lamination stack (124); a plurality of discharge passages (150) that extend between the plurality of distribution passages (142) and the airgap (130); a cooling manifold (160) defining an annular distribution plenum (164) in fluid communication with the plurality of distribution passages (142), wherein the cooling manifold (160) is configured for receiving a cooling fluid (144) and directing the cooling fluid (144) into the distribution plenum (164), through the distribution passage (142) and the discharge passage (150), and into the airgap (130).

Abstract: A terminal block that is to be fixed to a case of a device and to which an electrically conductive member is to be fastened by a bolt, the terminal block including: a nut to which the bolt is to be screwed; a heat sink that includes a heat dissipation portion configured to come into contact with a coolant for cooling the device; and an insulator that electrically insulates the nut and the heat sink from each other, wherein the heat sink includes a rib located around the nut.

Abstract: A stator core of a cooling apparatus includes: a back yoke having a cylindrical shape; a plurality of tooth portions that protrude along a radial direction from the back yoke; a plurality of slots that are formed between the tooth portions adjacent in a circumferential direction; a cooling path which is provided on the back yoke along the circumferential direction so as not to be in communication with the slot and in which a refrigerant flows; and a refrigerant supply port that is formed on the back yoke and supplies the refrigerant to the cooling path, in which the cooling path is configured to be divided into at least two portions in the circumferential direction, and the refrigerant supply port is formed on each cooling path.

Abstract: A system may include a rotor, a stator disposed around the rotor, the stator includes a stator core and windings, the windings include end windings extending from a longitudinal end of the stator core. A system may include a cover for the end windings and disposed around the rotor, the cover is configured to transfer a cooling fluid to cool the end windings, and the cover includes: a body to cover the end windings, the body including a cavity for the cooling fluid, an inlet disposed in the body for the cooling fluid to enter the cavity; and an outlet disposed in the body for the cooling fluid to exit the cavity, the outlet is disposed at a portion of the body opposite to the inlet, a first radial width of the cavity at the inlet is greater than a second radial width of the cavity at the outlet.

Abstract: A machine housing including a first housing part, a second housing part, and two straight centering elements. Each centering element engages both in one of the first centering element receptacles and in one of the second centering element receptacles, such that the centering element receptacles connected via the centering element are aligned axially with one another, such that the housing parts are aligned with one another such that the shaft bearing seats are centered axially along a common shaft bearing axis. A respective longitudinal center axis of the centering elements extends obliquely or perpendicularly to the shaft bearing axis.

Abstract: An electric motor includes a shaft, a rotor, a stator, a first bracket, a second bracket, a heat exchanger, a first guide, and a second guide. The heat exchanger includes an internal air bypass located radially outward from the internal air passage of the stator, and an external air bypass located radially outward from the internal air bypass and continuous to the external space. The heat exchanger further includes a heat transfer member to separate the internal air bypass and the external air bypass, and transfer heat from the internal air flowing in the internal air bypass to the external air flowing in the external air bypass.

Abstract: A motor may include a rotor; a stator comprising a stator core and a coil; a housing that houses the rotor and the stator; and a first annular member that provides a seal between a first end face of the stator core in an axial direction of the stator core and an inner wall surface of the housing. The first annular member may include a plurality of first holes through which refrigerant is injected toward a first coil end of the coil protruding from the first end face of the stator core. The plurality of first holes may include a first large hole and a first small hole, and the first small hole may have an opening area smaller than an opening area of the first large hole.

Abstract: A pressure plate connectable to a rotor of an electric motor comprises an endbell portion set against a peripheral portion of the rotor and a connector linked to the endbell portion and adapted to be connected on the rotor; the connector comprising a single body protruding from the endbell portion towards the rotor in a fully assembled condition of the electric motor, the single body being adapted to be entirely and simultaneously connected to the rotor in the fully assembled condition of the rotor.

Abstract: A compressor including an impeller for generating a compressed fluid within a volute, a motor housing having an inlet for receiving the compressed from the volute, an electric motor including a plurality of stator windings, a rotor and a shaft mechanically coupled to the rotor, and a stator insert having a plurality of holes for regulating a flow of the compressed fluid through the plurality of stator windings and restricting a flow of the compressed fluid through a plurality of gaps between the stator windings.

Abstract: A rotor for an electric machine includes an air circulation cooling system. The rotor includes a rotor core having cavities internal to the rotor core. The rotor core extends longitudinally between two ends. The cavities are defined by the rotor core. The cavities extend through the rotor core and open through at least one of the ends. The rotor core operates to circulate air through the cavities by rotation of the rotor core.

Abstract: Disclosed is an electric power steering system for a vehicle, the power steering system including: an electric motor configured to provide mechanical power to a steering mechanism of the vehicle for steering the vehicle; a housing in which the electric motor is disposed, wherein the housing comprises an inner housing in which the electric motor is disposed, and an outer housing disposed around the inner housing, and wherein an air flow path is defined within the housing, the air flow path being defined at least in part by a gap between the inner housing and the outer housing; and an air flow source arranged to generate an air flow along the air flow path to cool the electric motor, wherein the air flow source is independent from the electric motor.

Abstract: A rotor of an electric machine includes a rotor core, a plurality of permanent magnets located at the rotor core, and a rotor sleeve enclosing the rotor core and the plurality of permanent magnets. One or more sleeve cooling channels are positioned between a radially outer surface of the rotor core and a radially inner surface of the rotor sleeve and extend axially along a length of the rotor. One or more radial cooling channels extend radially outwardly from an interior of the rotor core to the one or more sleeve cooling channels. The one or more radial cooling channels are configured to convey a flow of cooling fluid from the interior of the rotor core to the one or more sleeve cooling channels.

Abstract: A cooling fluid conducting device for an electric machine has multiple cooling fluid lines which protrude outwards radially from a central axis of the cooling fluid conducting device on a common circular surface. Each cooling fluid line has an inlet opening which is designed to be arranged so as to be flush with a paired bore of a rotor shaft, whereby a cooling fluid can flow from the rotor shaft into the respective cooling fluid line via the inlet opening. Each cooling fluid line has at least one outlet opening which is designed to be arranged so as to face a stator or a rotor of the electric machine and via which the cooling fluid can flow out of the respective cooling fluid line and from the cooling fluid conducting device to the stator and/or the rotor.

Abstract: A rotor of a rotating electric machine includes a rotor core equipped with a cooling passage, a first retaining member disposed on one end side of the rotor core, and a second retaining member disposed on another end side of the rotor core. An inlet-side through hole of the first retaining member is inclined with respect to an axis of the rotor. An outlet-side through hole of the second retaining member is inclined with respect to the axis of the rotor. When the rotor is rotated, a cooling gas is introduced into the cooling passage through the inlet-side through hole, and the gas is discharged from the cooling passage through an outlet-side through hole.

Abstract: A rotating electric machine casing includes a flow passage forming wall which spirally extends at a constant inclination angle, at least partially between an upstream end and a downstream end of a spiral passage. The spiral passage includes first and second widened regions. First and second rectifying partition walls extending along the spiral passage is formed in the first and second widened regions.

Abstract: A cooling system for an electric traction machine for a motor vehicle includes a looped conduit system for conducting a first cooling liquid and a circulation pump for conveying the first cooling liquid in the looped conduit system in a first circulation direction. The system further includes an expansion tank filled at least partially with the first cooling liquid and at least partially with a gas and a motor input terminal for fluidically connecting the looped conduit system on an input side to an electric traction machine to be temperature-controlled. The system further includes a motor output terminal for fluidically connecting the looped conduit system on an output side to the traction machine and a first heat exchanger for dissipating heat from and/or supplying heat to the first cooling liquid. The expansion tank is configured with an aperture that is open to the environment.

Abstract: A rotatable dome blower wheel attachment that mitigates a risk of water droplets infiltrating a rotor and a motor. The dome blower wheel attachment may be rotatably coupled to the shaft of the blower motor and to the blower motor wheel to protect the rotor from water that is sprayed through the wheel. The coupling also ensures that the dome blower wheel attachment rotates with the blower motor shaft, the wheel, and the rotor. The dome blower wheel attachment may also have impellers coupled to the underside of the dome to direct airflow and water droplets away from the rotor while still protecting the rotor from water that is directed through the wheel.

Abstract: An electric motor disclosed herein may include a stator, a supply hole, a first flow passage, and second flow passages. The first flow passage and the second flow passages may be provided in the stator. The first flow passage may extend along a circumferential direction of the stator. The second flow passages may extend along an axis of the stator and cross the first flow passage. A plurality of guides may be provided in the first flow passage to disturb a flow of refrigerant. The refrigerant is supplied from the supply hole to the first flow passage and disturbed by the guides. A part of the refrigerant of which flow is disturbed flows into the second flow passages. The refrigerant is distributed, thus, the refrigerant flows evenly into the second flow passages. The entire stator is thus effectively cooled.

Abstract: A rotary electrical machine in which a rotor and a stator are housed in a housing and a coil of the stator is cooled using gas. The stator includes an annular coil end protruding from an end portion of the stator in an axial direction thereof. The housing includes an introduction port configured to allow gas for cooling the rotary electrical machine to be introduced from an outside of the housing toward the coil end. The coil end includes a flow path configured to allow the gas introduced from the introduction port to pass from an outer peripheral side to an inner peripheral side. A cooling air control member configured to guide the gas introduced from the introduction port to the flow path of the coil end is provided between the coil end and the housing in the axial direction.

Abstract: A ventilating fan has a fan housing formed to define an interior space, an inlet opening, and an outlet opening spaced apart from the inlet opening, a fan wheel arranged to lie within the interior space, the fan wheel comprising a blade hub and a plurality of fan blades from the blade hub, and a fan-wheel rotation drive assembly configured to rotate the plurality of fan blades about a rotation axis, the fan-wheel rotation drive assembly comprising one or more rotor magnets fixed to the fan wheel and arranged circumferentially around the rotation axis, and one or more stator magnets fixed to the fan housing and arranged circumferentially around the rotation axis.

Abstract: Methods, systems, and apparatus are disclosed to provide a pressurized fluid to components of a fluid pump. An example flow control system to provide a pressurized lubricant to a secondary flow network disposed within a fluid pump includes sensors to measure parameters of a fluid corresponding to fluid flow; a recirculation loop fluidly coupled to a secondary inlet of the pump, the recirculation loop to provide a first flowpath, wherein the secondary inlet is an inlet to the secondary flow network; a bypass circuit fluidly coupled to the secondary inlet to provide a second flowpath; and a controller to direct the fluid flow to the first flowpath or the second flowpath based on sensor data from the sensor, the sensor data indicative of a state of the fluid.

Abstract: The present disclosure relates to a stator assembly for an electrical machine. The stator assembly comprises a plurality of stator frames (110, 120, 130) forming a stator rim (100). The stator frames (110, 120, 130) defining ring sectors and mounted to each other to form a stator rim (100). Further, the stator frames (110, 120, 130) at least partially form an air distribution channel extending from at least one of the stator frames (110, 120, 130) into another of the stator frames (110, 120, 130). Methods (400) for assembling a stator assembly are also disclosed.

Abstract: An oil cooling system for an electric machine that includes a housing and a stator accommodated in the housing, the stator having a first end part and a second end part in an axial direction of the electric machine. The oil cooling system includes an oil inlet, for receiving external cooling oil; a first annular oil application pipe, located at the first end part and in fluid communication with the oil inlet; and a second annular oil application pipe, located at the second end part and in fluid communication with the oil inlet. An axial oil application part is located between the first end part and the second end part and formed by a housing inner wall and a stator outer wall. The axial oil application part receives cooling oil from at least one of the first annular oil application pipe and the second annular oil application pipe.

Abstract: The rotating electric machine comprises: a stator core that has a first stator core portion and a second stator core portion, and an air gap portion, the first and the second stator core portions having slots and being divided in the axial direction, the air gap portion being formed between the first stator core portion and the second stator core portion by making the first stator core portion and the second stator core portion face each other in the axial direction; a plurality of coil conductors inserted into the slots; a wall portion covering the air gap portion on the inner circumference side of the air gap portion; and a coolant flow passage that sends a coolant supplied from the outer circumference side of the stator core to the air gap portion through between the plurality of coil conductors to both end surfaces of the stator core.

Abstract: A rotary electric machine includes a bus bar holder provided on one side of a stator in an axial direction, and a plurality of bus bar terminals that electrically connect the stator and a control unit. A lead wire is drawn out to a bus bar terminal side in an axial direction from a lead-out portion located on the bus bar terminal side among a plurality of windings provided all around a circumferential direction of the stator and between a plurality of adjacent windings. The bus bar terminal includes a winding side terminal portion having at least one connection part and a board side terminal portion connected to a board. The bus bar terminals are gathered in a part in the circumferential direction. The lead wire is wired so as to extend from one of the lead-out portions scattered all around the circumferential direction to one of the connection parts.

Abstract: The present invention relates to a stator housing for an axial flux electrical machine, the stator housing being tubular and substantially cylindrical in shape, the inner surface of the housing comprising a plurality of recesses, each recess configured to receive an outer part of a conductive coil of a stator of an axial flux electrical machine. The cross-section of each recess, perpendicular to the axis of rotation of the axial flux electrical machine, is preferably elongate, the major dimension of each elongate recess extending substantially in the radial direction of the axial flux electrical machine.

Abstract: An outer rotor type motor includes a rotor in which magnets are arranged on an inner circumferential surface of a cylindrical rotor yoke. The outer rotor type motor comprises: a motor shaft configured to rotatably support the rotor; and a rotor attachment member including a base end extended from an outer periphery of the motor shaft outward in a radial direction and an outer end formed from an outer periphery of the base end outward in the radial direction, wherein the outer end is formed at a position close to the inner circumferential surface of the rotor yoke, as compared with an outer peripheral surface of the motor shaft, and the rotor is attached to the outer end.

Abstract: A permanent magnet embedded motor includes: a stator, including a stator core and a coil for excitation, the stator core being formed in an annular shape by laminating a plurality of steel plates obtained by punching a rolled steel plate material; a rotor, arranged inside the stator and including a permanent magnet; and a housing, made of metal and including a fitting recess of a cylindrical shape centered on a predetermined axis for fitting the stator therein. The stator is shrink-fitted into the housing, with a rolling direction of the steel plate being oriented in an expansion direction in which an inner diameter of the fitting recess undergoes a large amount of change during heating of the housing.

Abstract: An electric motor may include a stator assembly comprising a stator housing, and one or more rotors coupled to the stator by a rotor shaft assembly. The stator housing may include a cooling structure that has a plurality of cooling body portions and a plurality of cooling conduits defined by the plurality of cooling body portions. A method of forming a stator housing for an electric machine may include additively manufacturing a stator housing that includes a cooling structure defining a fluid domain, coupling a working fluid source to the stator housing and introducing a working fluid into the fluid domain defined by the cooling structure, and sealing the cooling structure with the working fluid contained within the fluid domain of the cooling structure.

Abstract: A bidirectional rotor device for electromechanical energy conversion and a method thereof is disclosed. The bidirectional rotor device comprises a first rotor, a second rotor, a plurality of planetary gears, an input actuation unit, and an electric power transferring unit. The first rotor and the second rotor counter-rotate, inducing electromagnetic interactions through strategically placed one of: one or more coils, one or more magnets, and one or more electromagnets enabling efficient power transfer. A braking system regulates rotational speed, enabling hybrid operation as both a motor and a generator. The bidirectional rotor device employs one or more artificial intelligence (AI) models, including load frequency control, droop control, and economic load dispatch, for real-time power optimization, predictive load balancing, and emergency fault detection.

Abstract: A rotor assembly for an electric machine includes a rotor segment configured to rotate about an axis and having a rotor body, a side wall and an outer band that cooperate to form a cavity, a plurality of magnets located in the cavity, and an end plate configured to block the plurality of magnets within the cavity.

Abstract: An electromagnetic element for an electric machine, having multiple slots arranged in the circumferential direction of the electromagnetic element, said slots extending in the axial direction of the electromagnetic element and having an open side in the radial direction. A coil device is arranged in the slots, said coil device having winding heads on (at least) one axial end face of the electromagnetic element, and a cooling channel is formed in the slots in order to dispense heat from the coil device using a fluid. A wall element is also provided which has a first region that is arranged in the region of the winding head in the circumferential direction. and a second region of the wall element, said second region adjoining the first region and having teeth which extend in the axial direction and are arranged on the open side of the slots in the intermediate spaces between the slots in the circumferential direction.

Abstract: An electric drive unit including a housing that includes an outer wall and a bearing shield that extends radially inboard from the outer wall, a stator disposed within the housing radially inboard of the outer wall, and a stator carrier having a first portion positioned radially between the stator and the outer wall and extending along the stator and a second portion that extends radially inboard from the first portion to a radially inboard terminus that is positioned radially inboard of the stator. The stator carrier and the housing define a fluid jacket. The fluid jacket has a first region that is defined by the outer wall and the first portion and a second region that is defined by the bearing shield and the second portion.

Abstract: An axial flux motor includes a motor shaft, a double-row angular contact ball bearing, and a stator. The double-row angular contact ball bearing is sleeved on the motor shaft and is fixedly connected to the motor shaft through a bearing inner ring of the double-row angular contact ball bearing. The stator is sleeved on the motor shaft through the double-row angular contact ball bearing, and the stator is fixedly connected to a bearing outer ring, so that the motor shaft can rotate relative to the stator. In this application, the double-row angular contact ball bearing is used in the axial motor, the double-row angular contact ball bearing can bear axial force generated through interaction between the stator and a rotor.

Abstract: A compact electric motor assembly unit includes an electric motor and an integrated thermal management system. A heat exchanger may be mounted directly to the electric motor and/or form part of the motor housing. A coolant pump may be mounted directly to the electric motor. The coolant pump may be connected either to a drive shaft of the electric motor or to a gear train disposed inside of the electric motor. In certain cases, the coolant pathways for the thermal management system are all located internal of the electric motor assembly unit.

Abstract: Various disclosed embodiments include oil warming systems, electric motors, and vehicles. In an illustrative embodiment a system includes an oil reservoir, a motor stator, and an oil pump. The oil reservoir is configured to hold oil therein. The motor stator is positioned such that at least a portion thereof is positioned within the oil reservoir where the at least the portion of the motor stator is in thermal communication with the oil while the oil reservoir includes the oil therein. The motor stator is configured to warm the oil while in an oil warming mode. The oil pump is fluidly coupled to the oil reservoir and is configured to draw oil out of the oil reservoir.

Abstract: A self-ventilated electrodynamic rotary machine includes a housing configured to at least partially axially enclose the rotary machine, and a fan connected in a rotationally fixed manner to a shaft on a ventilation side of the rotary machine and configured to generate a main cooling air flow when the shaft rotates about an axis. The fan includes a cover which is configured to direct the main cooling air flow onto the housing and is structured to improve cooling of the housing. An air guide element is detachably fixed to the cover to generate an additional cooling air flow. The air guide element, when viewed in a circumferential direction, has a segmented design and is configured as separate part for retrofitting to the cover depending on a thermal requirement of the rotary machine.

Abstract: The examples relate to a drive device for an electrified vehicle axle of a vehicle, with an electric machine which outputs via a transmission to drive shafts which lead to vehicle wheels of the vehicle axle, and with a coolant and/or lubricant module which supplies the electric machine and/or the transmission with coolant and/or lubricant. The electric machine, the transmission and the module being joined together to form an structural unit, in which the electric machine and the coolant/lubricant module may be flange-connected to the transmission in a manner to be spaced apart axially from one another, and, on its side which lies axially opposite the transmission.

Abstract: An electric motor includes a shaft supported rotatably about a rotation axis, a rotor located outward from the shaft in a radial direction of the shaft and rotatable integrally with the shaft, a stator facing the rotor in the radial direction, and a first bracket including an inlet to draw air into the electric motor from outside. The electric motor further includes a fan rotatable integrally with the shaft and having a first through-hole at a position facing a position inward from the inlet in the first bracket in the radial direction, and a first guide being cylindrical and facing the first bracket.

Abstract: A cryogenic cooling system for use in quantum computing applications can include a plurality of cryogenic cooling stages. Each of the plurality of cryogenic cooling stages can include a plurality of interleaved cooling units. The plurality of interleaved cooling units can include a first cooling unit and a second cooling unit. Each of the plurality of interleaved cooling units can have an associated operating temperature range. One or more signal lines that couple one or more classical processors to one or more quantum systems can pass through each of the plurality of interleaved cooling units for each of the plurality of cryogenic cooling stages.

Abstract: A ram air journal bearing shaft includes an additively manufactured body having a main body portion and a journal bearing portion. The main body portion and the journal bearing portion are coaxial along a first axis. At least a first set of heat exchanger fins extends from an outer diameter of the ram air journal bearing shaft to an inner diameter tie rod passage. Each heat exchanger fin in the first set of heat exchanger fins is additively manufactured as an integral structure to the additively manufactured body. A set of cooling air passages is disposed circumferentially about the first axis. Each cooling air passage is defined between adjacent heat exchanger fins of the first set of heat exchanger fins. The ram air journal bearing shaft is configured such that a cooling flowpath through the cooling air passages is established.

Abstract: A drive apparatus includes: a motor having a motor shaft rotatable about a motor axis; a power transmission connected to the motor shaft from one side in an axial direction; a housing having a motor housing portion accommodating the motor and a gear accommodation portion accommodating the power transmission; a channel through which a refrigerant circulates; a cooler; and a pump. The channel includes a first passage connecting a refrigerant pool in the housing and a suction port of the pump, a second passage connecting a discharge port of the pump and an inflow port of the cooler, and a third passage extending from an outflow port of the cooler to the inside of the motor housing portion. The cooler is fixed to an outside of the housing to overlap at least partially the gear accommodation portion in the radial direction above the horizontal plane including the motor axis.

Abstract: Disclosed is a direct slot cooling system for motors, including a stator configured to expand an inner slot space of a stator core where a coil is wound to form a cooling slot through which a cooling fluid passes; a rotor coupled to a center of the stator to rotate; and a housing coupled to left and right sides of the stator to form a cooling jacket in watertight communication with a cooling slot so that a cooling fluid circulates in the cooling jacket.

Abstract: The present disclosure is directed to systems and methods for cooling an electric aircraft. The system comprises an electronic device, a casing, at least one fin, and at least one PHP. The electronic device can generate heat. The electronic device can be housed within the casing. The fin can be attached to the outer wall of the casing. The PHP can be embedded within the fin, such that an evaporator section of the PHP is closest to the heat source and the condenser section of the PHP is furthest from the heat source. The PHP can also be placed within the casing. In some embodiments, the casing can have a plurality of slots. The fin can be shaped such that a single fin may slide into a pair of slots and come to rest adjacent to the casing, wherein a PHP can be embedded within the fin.

Abstract: An electric vertical takeoff and landing (eVTOL) aircraft lift motor is disclosed. The eVTOL aircraft lift motor includes a stator connected to the eVTOL motor and a rotor coaxial within the stator. The stator includes an inner cylindrical surface and an outer cylindrical surface coaxial about an axis. The rotor includes a rotor cylindrical surface defining the axis, an air gap formed by combining the rotor cylindrical surface with the inner cylindrical surface of the stator, a magnet array positioned opposite to and spaced from the inner cylindrical surface by the air gap. The eVTOL aircraft lift motor also includes a first fan connected to and configured to rotate with the rotor. In addition, in some embodiments, the first fan is connected to an axial end of the rotor. The first fan may include a base platform, a roof platform, and a blade configured to direct air toward the air gap.

Abstract: A rotor core of a rotating electric machine includes a cooling passage. The cooling passage includes an upstream end that opens in a first end surface of the rotor core and a downstream end that opens in a second end surface of the rotor core. The rotating electric machine is further equipped with a rectifying structure for converting the flow direction of gas an axial direction and a circumferential direction of the rotor. The rectifying structure is fixed to a non-rotating portion in a casing so as to face a rotor in an axial direction.

Abstract: A control device includes an information acquisition unit configured to acquire information related to an air density in a coil and information related to a voltage applied to a rotary electric machine, an insulation determination unit configured to determine whether or not dielectric breakdown occurs in the coil based on the information related to the air density and the information related to the voltage acquired by the information acquisition unit, and configured to determine whether or not an insulation state of the coil is needed to be maintained by supplying an oil to the coil, and a drive instruction unit configured to drive an oil supply unit, when the insulation determination unit determines that dielectric breakdown occurs in the coil and determines that the insulation state of the coil is needed to be maintained by supplying the oil to the coil.

Abstract: A housing for an electrical machine, which housing is formed with a cylindrical cooling jacket through which coolant is able to flow and which has a plurality of cooling channels that extend in the circumferential direction and an inlet section acting as a distributor and an outlet section acting as a collector, wherein, between the inlet section and the outlet section, there is arranged a partition wall in which a bypass is located, through which gas bubbles present in the inlet section can be diverted directly to the outlet section. The cooling channels extending in the circumferential direction are connected by at least one transversely extending venting channel.

Abstract: A housing of a rotating electrical machine has a flow path extending in a rectangular wave shape along a circumferential direction, and including axial paths, and first and second circumferential paths joining first ends and second ends of the axial paths, respectively. The axial path includes joined first and second paths. A cross-section in each of the first and second paths decreases toward the other. A difference between the cross-sections at the first end and at the first circumferential path is not higher than a difference between the cross-sections at the first end and at a third end of the first path close to the second path. A difference between the cross-sections at the second end and at the second circumferential path is not higher than a difference between the cross-sections at the second end and at a fourth end of the second path close to the first path.