Abstract: A wedge cooling apparatus and method for cooling a rotating machine, such as a generator, disperses a spray of cooling fluid into the wedges of the generator. The spray cooling method results in a high heat transfer coefficient of about 2000-3000 W/m2C as opposed to conventional conduction cooling, which has a heat transfer coefficient of about 200-300 W/m2C. The apparatus and method of the present invention efficiently removes heat from high powered, high current density designed generators.

Abstract: A permanent magnet rotor assembly for an electric machine includes a rotor core including one or more axially-extending openings and one or more permanent magnets located in the one or more axially-extending openings defining one or more gaps between the one or more permanent magnets and the one or more axially-extending openings. One or more thermally-conductive bars are located in the one or more gaps to transfer thermal energy from an interior of the rotor assembly toward an axial end of the rotor assembly.

Abstract: A turbo generator (1), including a stator and a rotor (2), has a rotating bell type exciter (3) connected to one end of the rotor (2) and the exciter (3) being equipped with at least one cooler (7). An axial duct (11) with a guide (12) is provided between a cylindrical housing (13) and the outer circumference of the bell type exciter (3). Thus, drawbacks of the prior art are mitigated and the efficiency of the bell type exciter is increased by recovering the dynamic energy of the cooling fluid flow.

Abstract: Described is a rotating electrical machine integrating an electronic module comprising a printed circuit, a plurality of electronic power and signal components positioned on the components side of the printed circuit, a plurality of conductor tracks, positioned on the welding side opposite the components side of the printed circuit, which implement the direct electrical connections between the electronic power components; the electronic power and signal components are in contact through a filler with the cap of the electrical machine for allowing an optimum dispersal of the heat generated by them, the contact being guaranteed by elastic elements which press on a support in which the electronic module is housed.

Abstract: A motor driven assembly comprises a motor shaft, a rotor, a passage, and a corrugated fin heat transfer structure. The motor shaft is mounted for rotation about a rotational axis. The rotor is located radially about the shaft. The passage extends through the rotor alongside the motor shaft. The corrugated fin heat transfer structure is disposed within the passage radially aligned with the rotor.

Abstract: A permanent magnet motor, generator or the like that is constructed with a concentrated winding and edge form wound stator coils. This achieves less eddy current losses in the windings as well as a much higher power density than conventional techniques.

Abstract: A rotary electric machine including a brush used to supply a field current to a field winding of a rotor, a brush holder holding the brush, a power circuit portion connected to a heat sink having fins, and a case covering the power circuit portion and the brush holder. An air passage is provided between the brush holder and the fins of the heat sink, and an opening is provided to the case so as to cover component members of the brush holder in a shape conforming to an outer peripheral portion of the brush holder, from which cooling air is allowed to pass through the air passage.

Abstract: A substrate transport apparatus including a drive section and a first movable arm assembly. The drive section includes a first motor. The first motor includes a stator and a passive rotor. The first movable arm assembly is connected to the first motor. The substrate transport apparatus is configured for the first movable arm assembly to be positionable in a vacuum chamber with the passive rotor being in communication with an environment inside the vacuum chamber.

Abstract: The invention relates to an electric motor having at least two stators disposed coaxially to each other and a rotor, wherein each stator has 2*n poles, with n=1, 2, 3, . . . , wherein each stator has at least one common coil or winding for all poles, wherein each stator has a first and second partial shell, wherein each partial shell has a shell bottom and n poles, wherein each pole is formed as a tooth extending in axial direction or substantially in axial direction and beginning on the shell bottom, wherein with assembled partial shells of a stator the tooth or the teeth of the first partial shell is or are disposed in alternating manner in circumferential direction with the tooth or the teeth of the second partial shell, and wherein with assembled partial shells or a stator, the at least one coil) or winding is received between the partial shells.

Abstract: Provided is an air blower for a fuel cell vehicle, and in particular, an air blower for a fuel cell vehicle having a cooling water passage formed in a motor case and an air flowing groove to increase cooling efficiency and reduce a shaft load to improve durability.

Abstract: An electric machine housing including a base wall, an outer wall extending from the base wall to an outer cantilevered end, and an inner wall spaced from the outer wall forming an annular void. The inner wall extends from the base wall to an inner cantilevered end. A first plurality of ribs extend within the annular void from the base wall toward the outer and inner cantilevered ends. A second plurality of ribs is arranged within the annular void spaced from the first plurality of ribs. The second plurality of ribs extend from the outer and inner cantilevered ends toward the base wall. The first and second pluralities of ribs define a tortuous flow path within the annular void.

Abstract: An electrical submersible pump motor has motor oil flowing through external circulation tubes for cooling the motor. A substantial portion of the exterior of each tube is submerged in and exposed to wellbore fluid. Heat is transferred from the motor to the motor oil, and then circulated through the external circulation tubes to conduct heat to the wellbore fluid. Internal or external motor oil pumps may be used to propel the motor oil through the circulation tubes. Guards or baffles may be used to protect the circulation tubes and to influence the flow of production fluid over the circulation tubes.

Abstract: A linked semiconductor module unit links a plurality of semiconductor modules by a first bus bar and a second bus bar, which are embedded in resin parts. The linked semiconductor module unit is disposed in a place other than on a printed circuit board. The semiconductor module linking structure is implemented readily by molding the bus bars together with semiconductor chips and lands to form the resin parts.

Abstract: A semiconductor device includes a semiconductor module and a pressing member configured to press the semiconductor module to a heat radiation member. The semiconductor module includes switching elements, conductors, and a molded member. Each of the switching elements is mounted on a corresponding one of the conductors. The molded member covers the switching elements and the conductors. More than three of the switching elements are disposed around the pressing member. The switching elements are disposed in a region in which a pressure generated between the semiconductor module and the heat radiation member by pressing with the pressing member is greater than or equal to a predetermined pressure with which heat generated from the switching elements is releasable from the semiconductor module to the heat radiation member.

Abstract: A thermal control system includes a stator having conductor end turns at opposite axial ends thereof, and first and second cooling systems respectively disposed at the opposite axial stator ends, each cooling system having a cover, a coolant inlet, a coolant outlet, and at least one cooling channel. Thermally conductive potting compound thermally mates the cooling systems with the end turns. A method of cooling end turns includes providing a cooling system for each axial end of the stator, each cooling system having at least one cooling channel that includes a coolant inlet and a coolant outlet, and thermally mating each cooling system to the respective end turns. A method of cooling end turns includes providing separate cooling systems in each axial end plate of an electric machine, and filling space within the end turns, and between the end turns and the cooling systems, with thermally conductive potting compound.

Abstract: A rotary electric machine in accordance with the invention includes: a case including a front-side housing and a rear-side housing; a rotor having a field winding placed in the case; a stator having an armature winding placed in the case; a power module for energizing armature current that flows in the armature winding; a heat sink, on which the power module is mounted, for cooling the power module; a field circuit module for controlling field current that flows in the field winding; and a control circuit for controlling the operation of the power module and the field circuit module, wherein the power module includes a pair of power modules mounted opposite to each other on a base surface of the heat sink, and the heat. sink includes a plurality of cooling fins placed thereon.

Abstract: The present invention relates to a heat-sink base provided with heat-sink fin portions, it manufacturing method and a motor provided with the heat-sink base. The base is produced by pouring cast metal into a mold cavity to replace a pattern having a predetermined sublimation temperature. The base includes a preformed heat-sink member comprising a plurality of heat-sink fin portions and at least one anchor portion embedded at least partially in the pattern, and a base body comprising an enclosed base portion and a holder portion for receiving and holding the at least one anchor portion. By virtue of the invented method, the heat-sink member having an extremely thin thickness can be mounted on the base body and the overall surface area of the heat-sink base is increased considerably.

Abstract: A rotating electric machine including: a bracket holding a rotor and a stator of a motor; a heat sink provided fixedly to the bracket on an outside of the bracket; a resolver disposed between the heat sink and the motor; a stator circuit portion and a field circuit portion disposed to the heat sink on a side opposite to the resolver; and a control board supported on an insert case attached to the heat sink and electrically connected to the stator circuit portion and the field circuit portion. A resolver input-output terminal is electrically connected to the control board by passing through an insertion hole provided to the heat sink. The rotating electric machine configured in this manner is compact and inexpensive with an excellent heat-releasing performance and a capability of reducing man-hours required for assembly and components required for connection.

Abstract: A rotary electrical apparatus includes a housing, a stator including a center axis inclined by a predetermined angle relative to a horizontal direction in a case where the housing is fixed to a mounting member, a rotor, and an oil stored at a lower side within the housing relative to the center axis and functioning as at least one of a cooling oil, a lubricating oil, and an operating oil. The housing includes an oil inlet port and an oil discharge port allowing the oil to be discharged once a predetermined amount of the oil is stored within the housing, the oil discharge port being displaced from a first oil passage on which the oil supplied from the oil inlet port moves downward along an inner peripheral wall surface of the housing in a state where the housing is held so that the center axis is arranged to be horizontal.

Abstract: A motor drive apparatus includes a motor; and an ECU. The ECU includes an ECU housing. The ECU housing includes a heat sink having a module receiving portion. The module receiving portion includes a heat-receiving surface and an opening portion open to one-end side of the ECU housing. The ECU further includes a control substrate received by the ECU housing to be perpendicular to the heat-receiving surface and to face the motor; a plurality of semiconductor modules each received in the module receiving portion and connected electrically with the control substrate to control a power supply of the motor. Each of the plurality of semiconductor modules includes a heat-radiating surface at an outer portion thereof. The ECU further includes a module retaining section pressing the heat-radiating surface to the heat-receiving surface to retain each of the plurality of semiconductor modules in the module receiving portion.

Abstract: A power module for supplying driving current to coils wound on a stator of an electric motor and a heat sink for absorbing heat generated at the power module are provided at an axial outside of a motor casing. An intermediate member is provided between the motor casing and the heat sink. The intermediate member has a bottom plate portion fixed to an axial end plate of the motor casing and a cylindrical side wall axially extending from the bottom plate portion. An outer peripheral surface of the heat sink is in contact with an inner peripheral surface of the cylindrical side wall, so that the power module fixed to the heat sink is arranged in a space, which is within a range smaller than an outer diameter of the motor casing.

Abstract: The permanent magnet rotating electric machine comprising a stator with a stator coil wound on a stator iron core, a rotor with a plurality of permanent magnets disposed in the circumferential direction in a rotor iron core, which is disposed opposite to the stator iron core of the stator with a predetermined spacing therebetween and is fixed to a shaft, a water-cooling unit disposed around the outer circumference of the stator iron core, and a fan fixed to the shaft on the same side as at least one axial end of the rotor iron core to circulate cooling air in the permanent magnet rotating electric machine; further comprising ventilation paths, through which the cooling air flows, formed around the outer circumference of the water-cooling unit; wherein after the cooling air has been circulated by the fan in the machine for cooling, the cooling air is led to the ventilation paths to perform heat exchange between the cooling air flowing in the ventilation paths and the water-cooling unit, after which the cool

Abstract: An electric machine includes a stator core having a plurality of circumferentially-oriented slot positions, each slot position having a plurality of radially-oriented slots, each slot extending longitudinally through the core. The stator core has a plurality of conductor segments each extending through at least one of the slots. When a slot position is populated with at least two conductor segments, at least two exterior conductor portions exiting the slot position are angled radially apart from one another by more than one degree. A method of cooling an electric machine includes providing coolant access to embedded conductor end turn portions of a stator having circumferentially spaced slot positions by radially spreading exterior conductor portions exiting populated ones of the slot positions.

Abstract: An object of the present invention is to provide an electrical rotating machine capable of securing safety against collision. Included are a rotor having a field winding and cooling fans, and a stator having a stator winding, arranged so as to surround the rotor. A bracket 1 is fixed to a load side end of the stator, and a heat sink is disposed inside the bracket. On the anti-load side of the heat sink, a field circuit unit and power circuit units for controlling the field winding and the stator winding, respectively, are mounted, whereas on the load side thereof, cooling fins are disposed. The anti-load side and lateral side of the field circuit unit and the power circuit units are surrounded by the bracket. Accordingly, a whole of the field circuit unit and the power circuit units is surrounded by the bracket and the heat sink.

Abstract: A drive device for a vehicle includes a motor generator generating drive force, and a power control unit provided integrally with the motor generator for controlling the motor generator. The includes a low-voltage circuit section to which a relatively low voltage is applied, a high-voltage circuit section which is located at a rear side of the vehicle relative to the low-voltage circuit section and to which a relatively high voltage is applied, and a cooling plate located between the low-voltage circuit section and the high-voltage circuit section in a longitudinal direction of the vehicle for cooling the high-voltage circuit section. With such configuration, the drive device for a vehicle allows the power control unit to be protected appropriately against an externally imposed shock.

Abstract: To provide an outer rotor type motor configured so that the lead wires of the winding coils for the stators are routed simply. An outer rotor type motor is provided with stators arranged in the axial direction, a rotor supported so as to rotate around the stators, a drive shaft provided integrally with the rotor, winding coils respectively wound on the stators, and magnets affixed to the rotor so as to respectively correspond to the stators. The outer rotor type motor is configured so that the rotor and the drive shaft are rotated by the magnetic action between the winding coils and the magnets. A penetration portion extending in the axial direction is provided in at least one of the stators, and the lead wires of the winding coils are inserted through the penetration portion and led to the outside.

Abstract: An electric motor has a stator and a coil which is arranged within the stator housing and whose winding can be energized via a connection line system. A cooling plate is arranged outside the interior of the stator, and on the outer side of said cooling plate a carrier plate for motor electronics is arranged, to which carrier plate the connection line system is connected. The connection line system is led from the inside to the outside through a recess in the cooling plate and is electrically connected to the carrier plate.

Abstract: An electric machine having a segmented core wherein the core includes a plurality of core segments. The segments are secured together with a belt member that substantially encircles the core segments but does not extend the full axial length of the segments. In some embodiments, the individual segments include a recess on their outer radial surface in which the belt member is positioned. A method of assembling an electric machine having a segmented core is also disclosed. Coils are wound about the poles of a plurality of segments. After forming the coils on the segments, the segments are joined together with a belt member wherein the belt member does not extend the full axial length of the core segments and is positioned between the two axial ends of the core assembly.

Abstract: Embodiments of the invention provide an electric machine module including an electric machine with a stator assembly. The stator assembly includes a plurality of stator laminations coupled together and a plurality of conductors positioned through axial slots of the plurality of stator laminations. The electric machine module also includes a coolant channel at least partially defined within the axial slots and a housing. The housing at least partially circumscribes the electric machine and at least partially defines a machine cavity which is in fluid communication with the coolant channel.

Abstract: An architecture of interconnected electronic power modules for a polyphase rotary machine, comprising electrically interconnected power modules (5) and a connector (6) including one or more layers formed by pluralities of conductive traces borne by plates, such as to connect the power modules (51 to 53) to one another and to electrical elements of the rotary machine. The power modules (51 to 53) comprise a plurality of connection elements (510 to 530) brazed directly to components of the power modules (51 to 53) and, in the upper part, to conductive traces of the connector (6). This architecture includes a heat sink (4) equipped with open cavities (41 to 43) for receiving the power modules (51 to 53). A polyphase rotary machine is also provided using such an architecture, in particular a dual three-phase alternator with synchronous rectification.

Abstract: The present invention relates to a brushless motor and especially to a rotor of brushless motor. The rotor of brushless motor includes a front cover, a cylindrical casing and a magnet adhered to the inner face of the cylindrical casing. The cylindrical casing is provided with some grooves on its outside surface. The present invention has made the best of the outside surface of the cylindrical casing of the rotor. In this case, an excellent heat dissipating effect can be achieved without changing the structure of the motor since the flow rate of air and the heat dissipating contact area between the air and the rotor is improved during the rotation.

Abstract: An electric machine is provided with a rotor core rotatable about a central axis. A first end ring is operatively connected to one end of the rotor core. A first housing component at least partially encloses the rotor core. At least one first rotor fin extends from the first end ring in a first direction which may be substantially parallel to the central axis. At least one first housing fin extends from the first housing component in a second direction that is substantially opposite to the first direction. The first rotor and housing fins extend circumferentially around the central axis. The first rotor fin and the first housing fin are configured to interleave, thereby enhancing heat transfer between the first rotor and housing fin, and cooling the rotor core.

Abstract: The present invention provides a motor with an internal driver comprising: a shell, having a stator, a rotor and a drive shaft attached to said rotor in an internal thereof; a front cover; a rear cover; ends of a drive shaft penetrating through holes of the front and rear covers respectively to the external. The inner surface of rear cover comprises outer and inner circumferential walls and a receiving space is defined by the outer and inner circumferential walls and inner surface of the rear cover. A driver is provided within said receiving space and the outer surface of rear cover is provided with a bearing slot to receive a bearing. An inner diameter of the inner circumferential wall is greater than the drive shaft; and said inner diameter of said inner circumferential wall is smaller than the annular diameter of the bearing in the bearing slot.

Abstract: A voltage regulator device for a rotary electrical machine, notably an alternator and/or alternator-starter of a motor vehicle. The regulator device (14) comprises one or more electronic components (28) able to contribute to controlling the electric machine, a heat sink (30) having parallel heat-dissipating vanes (32). The heat sink is in a heat-exchange relationship with the component or components, and a support (34) on which the heat sink is positioned. The support is able to be mounted on the electric machine in such a way that the vanes of the heat sink can orient an air flow towards a region of depression provided between the support and the machine. A bearing of an electric machine is equipped with such a device and to an electric machine equipped with such a bearing.

Abstract: A voltage regulator device for a rotary electric machine, notably an alternator and/or an alternator/starter of a motor vehicle, said regulator device (14) comprising a support (34) and one or more electronic components (28) able to play a part in controlling said electric machine, the support comprising a first part (60) on which the component or components is or are mounted, said first part having an edge (62) equipped with a brush holder (50) equipped with at least one housing, known as the brush housing, capable of housing a brush (15) for making an electrical connection with a rotor (3) of the electric machine possible. According to the invention, said device is configured to allow air to flow through said first part of the support, in contact with said brush holder.

Abstract: A power element 22 is mounted on a board 21 outside an electric motor body 10 when viewed from an axial direction X. Heat produced by the power element 22 is conducted to a heat mass 32 formed outside the electric motor body 10 when similarly viewed from the axial direction X in a portion opposed to the power element 22, and radiated from a board-side heat radiating fin 33, and is also conducted through an uneven structure 42 which surrounds the power element 22 and radiated from a cover 40.

Abstract: A pump assembly with a motor housing (4) and with a terminal box (6) which includes at least one peripheral section (10) situated on the outer periphery of the motor housing (4). A cover (12) is provided, which in each case at least partly covers the motor housing (4) and the peripheral section (10) of the terminal box (6) on an axial end-side. The cover (12) is designed in a heat-conducting manner and at an inner side thereof is in contact with at least one electronic complement (14).

Abstract: A control device (28) includes: a housing (15); a control section including control-section connection terminals (5, 6, 7) and an electronic component (22); a heat sink (13); an external-connection connector (8) which includes connector connection terminals (9, 10, 11) to be electrically connected to the control-section connection terminals (5, 6, 7); and a cover (17). The connector connection terminals (9, 10, 11) and the control-section connection terminals (5, 6, 7) pass through a housing hole portion (16) covered with the cover (17) to be electrically connected to each other at respective distal end portions. Accordingly, in the control device having a different mounting direction of the external-connection connector or including a different type of the external-connection connector, the same housing, heat sink, and control section can be used so that manufacturing cost of the control device can be significantly reduced.

Abstract: There is provided a compact stator coil assembly that has heat radiation increased and a cooling performance improved. A stator coil assembly includes a first coil piece, a second coil piece, and an insulating member provided with a retaining portion that catches the first coil piece and the second coil piece so that those coil pieces form a predetermined coil pattern. A coil loop is formed by the first coil piece and the second coil piece. The stator coil assembly further includes a heat-transfer member having a heat-transfer portion insulated from the first coil piece and the second coil piece and embedded in the insulating member, and a slit formed in the heat-transfer member so as to cut off the pathway of an induced current that is to flow through the heat-transfer member.

Abstract: A cooling system for an electrical machine includes a substantially closed housing, a first heat exchanger arranged inside of the housing, a second heat exchanger arranged outside of the housing, a conduit assembly for transferring a heat exchange medium in a closed circuit between the first and the second heat exchangers, a first air circulating means configured to circulate air inside of the housing over the first heat exchanger, and a second air circulating means configured to circulate air outside of the housing over the second heat exchanger, wherein the conduit assembly includes a pump for actively circulating the heat exchange medium between the first and the second heat exchangers.

Abstract: An outer rotor motor is provided for use in a machine. The motor includes a rotor and a stator. A control board assembly configured to control at least one operational characteristic of the motor is mounted at least in part radially inside the stator.

Abstract: A power module, a control board and a heat sink are provided on one axial side of a shaft of an electric motor, which consists of a motor case, a stator, a rotor, the shaft and the like. The power module is electrically connected with extraction lines, which extend from a coil wound around the stator, and supplies a drive current to the coil. The control board for controlling switching of the power module is provided on a motor case side of the power module. The heat sink is provided on a side of the control board opposite to the motor case. Thus, when setting of an output of the electric motor is changed, a body size of the heat sink can be changed without changing a positional relationship between the control board and the electric motor and a positional relationship between the power module and the electric motor.

Abstract: An electric two-wheeled vehicle includes a case, an electric component accommodated in the case and having an electric part producing heat during operation, and a traveling wind guide body for cooling the electric component by traveling wind, and the traveling wind guide body has a traveling wind inlet taking in traveling wind from front, a traveling wind path through which the traveling wind taken in by the traveling wind inlet flows, and a traveling wind outlet ejecting the traveling wind flowing through the traveling wind path toward a radiation fin of the case.

Abstract: Embodiments of the invention provide an electric machine module comprising a module housing. In some embodiments, the module housing can include a sleeve member and at least one end cap. Also, an inner wall of the module housing can at least partially define a machine cavity. In some embodiments a coolant jacket can be positioned within a portion of the sleeve member. Further, in some embodiments, at least one partition can be positioned substantially within the coolant jacket. The partition can be dimensioned to at least partially seal a first region of the coolant jacket from a second region of the cooling jacket.

Abstract: A fan self-cooling structure with heat pipe includes a stator assembly, a fan circuit board, and at least one heat pipe. The fan circuit board is flatly connected to a bottom end of the stator assembly and has at least one heat-producing electronic element provided thereon. The at least one heat pipe is provided on the fan circuit board for absorbing and transferring heat energy produced by the at least one electronic element. With these arrangements, it is able to lower the temperature of the electronic elements in a fan and enhance the characteristics of the fan.

Abstract: An alternator includes a stator S, a rotor R and a transistor bridge, which form synchronous rectification. The synchronous rectification is in the form of an over-molded mechatronic housing (2), and the mechatronic housing includes an electronic power substrate (3) and power connection terminals (23), (24). Electronic chips (300A, 300B) are implanted on the electronic power substrate, and at least one of the power connection terminals is connected electrically to the electronic chip by means of at least a first soldered connection wire (300, 301, 302, 30B+, 30B?). According to one embodiment, the electronic power substrate is of the IMS, DBC or PCB type.

Abstract: An electric motor has a stator bushing in which components that generate heat are disposed. A rotor housing that has at least one air conveying element is rotatably connected to the stator bushing. The air conveying element has a top side that is facing the stator bushing and that is at least basically smooth. The air conveying element has an annular disk that is provided with the basically smooth top side. The air conveying element has flow guiding elements that are radially extending ribs provided on the bottom side of the annular disk.

Abstract: An electric machine including a closed chamber with a wall and enclosing a stator, a rotor and a first fluid and a heat exchanging unit stretching from the chamber through the wall to a fluid transporting passage. The heat exchanging unit includes conduits provided in a loop, containing a working fluid and equipped with evaporator channels and condenser channels, first heat transfer elements inside the chamber for transferring heat from the first fluid to the working fluid via the evaporator channels and second heat transfer elements in the passage for transferring heat out of the working fluid via the condenser channels to a second fluid, a first fluid propagating unit inside the chamber forcing the first fluid to circulate and a second fluid propagating unit in the passage forcing the second fluid to flow past the second heat transfer element.

Abstract: There is disclosed a rotary electromotor including a stator, a stator winding on the stator, a stator frame, a rotator, end covers, and a highly heat-conductive member. The stator has a plurality of magnetic poles. The stator frame supports the stator. The rotator is supported by the stator with a gap therefrom such that the rotator is rotatable. The end covers close opposite ends of the stator frame. The highly heat-conductive member is fixed by a resin material in a space defined inside the stator, the stator frame, and the end covers.

Abstract: Embodiments of the invention provide an electric machine module including an electric machine with a stator assembly. The stator assembly includes a plurality of stator laminations coupled together and a plurality of conductors positioned through axial slots of the plurality of stator laminations. The electric machine module also includes a coolant channel at least partially defined within the axial slots and a housing. The housing at least partially circumscribes the electric machine and at least partially defines a machine cavity which is in fluid communication with the coolant channel.