Abstract: A pump case of an electric pump is constructed by coupling a first pressed member formed with a cylindrical part for holding a first rolling ball bearing rotatably supporting a rotary shaft, and a second pressed member formed with a recess for receiving an inner rotor provided at a tip end of the rotary shaft to each other. Because the first pressed member and the second pressed member are formed by deep-drawing work, it is possible to achieve simplification of the structure and reduction of the cost, as compared with the pump case which has been produced from an aluminum die casting or the like, as in the related art.

Abstract: A method of manufacturing a yoke of an electric rotary machine is disclosed. The manufacturing method includes providing a cutout steel plate having one end formed with a plurality of concave portions and the other end formed with a plurality of protrusions, rolling the cutout steel plate into a cylindrical shape until a distal end of each protrusion faces the inlet of each concave portion, inserting the protrusions into the concave portions, respectively, in a circumferential direction, and conducting punch-caulking press on each protrusion at near-wall areas on both sides thereof in close proximity to indents of each concave portion to form localized expanding portions at the near-wall areas on both sides of each protrusion while causing the localized expanding portions to flow axially outward to be fitted into the indents of each concave portion, respectively.

Abstract: To provide an electric compressor in which the occurrence of shrink-fitting failures can be prevented when a stator is shrink-fitted in a motor case.

Abstract: A cooling fan with oil-impregnated bearing includes a bearing seat having a bearing housing; a bearing rightly fitted in the bearing housing with a colloidal material applied between them to maintain dimensional precision of the bearing and the bearing housing; and a fan hub mounted on and around the bearing housing with a rotary shaft extended through the bearing. The bearing housing has a distal end integrally formed into a retaining section to prevent leakage of lubricating oil, and a proximal end having a bottom cap tightly fitted therein with a colloidal material applied between the bearing housing and the bottom cap. The bearing is formed at positions near the retaining section and the bottom cap with an oil receiving space each to minimize loss of lubricating oil. A supporting plate is provided in the bottom cap to support the rotary shaft, allowing the fan hub to rotate stably.

Abstract: The invention relates to an electric motor having a permanent magnetic rotor supported in a rotatable fashion around a central axis, a wound stator with a cylindrical stator winding, claw poles, perpendicular in reference to the disc-shaped stator plates and arranged around the central axis, and a tubular return ring connected to the stator plates free from play. The object of the invention is to provide an electric motor, in which the stator is composed from as few parts as possible, with its assembly being simple, its construction being robust, and being provided with an optimum effectiveness, allowing a great freedom of design and space used and thus an economical structure. This object is attained according to the invention in the disc-shaped stator plates being in one piece with the claw poles and being calked to the return ring with the disc-shaped stator plates.

Abstract: A method and system of cooling an enclosure or motor is disclosed. An exemplary permanent magnet electric motor is formed with an external stator and an internal rotor. The motor controller is in thermal proximity to the motor but is thermally isolated from the motor by an air chamber. In one exemplary embodiment, one or more heat sinks are provided to create efficient heat removal paths. In another exemplary embodiment, one of more heat pipes are located in the system.

Abstract: An engine cooling module includes a shroud structure 12 having a shroud hub 46 constructed and arranged to receive a portion of a motor 16. A DC electric motor 16 has first and second ends and a rotatable shaft 40. The second end of the motor is received by the shroud hub. A fan 70 is provided that has a fan hub 72. The fan is coupled with the shaft for rotation therewith. The shroud hub 46 defines a protective cover covering the second end of the motor, and the fan hub 70 defines a protective cover covering the first end of the motor. Thus, no motor housing is required.

Abstract: The invention relates to an electric motor (10) and to a method for producing said electric motor, especially for adjusting mobile parts in a motor vehicle. Said electric motor comprises a rotor (12), a lower housing part (16) and an upper housing part (18) which can be radially assembled in relation to the rotor (12), and at least two permanent magnets (22) that are coupled to each other by means of a magnetic feedback element (24). Said feedback element comprises a lower feedback sheet (28) and an upper feedback sheet (30), the upper feedback sheet (30) having a stop face (40) that rests on a mating stop face (42) of the lower housing part (16).

Abstract: A shaft cover structure for use in an exciter is provided. The shaft cover structure comprises at least two sections located about a selected portion of a rotatable shaft. The sections are positioned such that adjacent circumferential ends of the at least two sections are spaced apart to define gaps therebetween. A recess extends from each circumferential end such that adjacent recesses define a slot. A spanning member is disposed in each of the slots such that the sections and the spanning members cooperate to form a continuous cover member that surrounds the selected portion of the shaft. A first holding structure secures the continuous member on the selected portion of the shaft.

Abstract: The invention relates to a device for mounting an electric motor (10) in a manner that isolates vibrations, in particular a fan motor, wherein the electric motor (10) features at least one pole housing (12, 14) serving as a magnetic yoke circuit, as well as means (26, 27) for fastening isolating elements (32, 33), in particular elastic isolating elements. In accordance with the invention it is proposed that the means (26, 27) for fastening the isolating elements (32, 33) are embodied to be a single piece with the pole housing (12, 14).

Abstract: An electric actuator, which includes an exposed actuator terminal, for eliminating the need for insert molding and facilitating the manufacturing of a housing while preventing liquid from entering the housing. The actuator includes a motor. The housing is attached to the motor and includes an opening. A control circuit board accommodated in the housing controls the motor. An actuator terminal is arranged on the control circuit board and connected to an external terminal of an external connector through the opening. A terminal support arranged on the control circuit board supports the actuator terminal. A hollow fitting is attached to the terminal support and fitted into the opening so as to extend into the housing. A seal, arranged between the terminal support and the fitting, seals the housing.

Abstract: An energy generating module includes an enclosure, a modular cage, a fuel chamber, and a railcar chassis. The energy generating module is transportable on rails via the railcar chassis. The modular cage comprises a peripheral cage secured to an interior of the enclosure and one or more multi-directional extensions extending from the peripheral cage to support an energy generating device within the enclosure. The multi-directional extensions are movable in multiple directions as the peripheral cage sways during transportation of the energy generating module so as to permit the energy generating device to track its inertial position more closely than the sway of the peripheral cage during transportation of the energy generating module. The fuel chamber is configured to be in fluid communication with the energy generating device.

Abstract: A rotating electric machine which includes: a stator having a stator core fixed inside a bottomed frame and a stator winding wound around the stator core; a bracket fixed to an opening side of the frame; a rotor having a shaft penetrating the bracket and rotatably supported by a bracket side bearing and by a frame side bearing, the rotor being arranged inside the stator core interposing a gap therebetween; a respective phase lead wire electrically connected to the stator winding and led out from the bracket; a rotation sensor that detects a rotational position of the rotor; and a sensor signal wire connected to the rotation sensor and led out from the bracket. A front end portion of the respective phase lead wire is introduced to inside the bracket from outside an opening portion provided at the bracket, thereby electrically connecting to the stator winding.

Abstract: A cooling jacket of an electric motor or generator includes a cylindrical inner sleeve, a cylindrical outer sleeve coaxially surrounding the inner sleeve and forming a circular space between the outer sleeve and the inner sleeve, and a passageway extending within the circular space between the outer sleeve and the inner sleeve. The passageway may be a continuous winding path that may extend axially back and forth along the circumference of said inner sleeve. An embodiment of the present invention provides a cooling jacket that is suitable for, but not limited to, applications in the aircraft and aerospace industries, for example in air-conditioning systems. The cooling jacket as in one embodiment of the present invention may be leak proof and water tight, has a compact design, and may be easily assembled and integrated into an electrically driven machine, such as an electrically driven compressor.

Abstract: An electric motor is described that includes a mid-shield, a chassis, and a motor control unit configured to be mounted to the chassis. The chassis includes a plurality of clinches formed proximate a first end of the chassis and configured to provide axial positioning of the mid-shield with respect to the chassis.

Abstract: There is provided an in-vehicle AC generator having a regulator assembly that is mounted in the bracket of the AC generator. The regulator holding unit provided in the regulator assembly has a containing portion in which at least the whole periphery of an opening is surrounded by a wall member; a circuit unit of the regulator is inserted into the containing portion through the opening; the heat sink for the regulator is held by the containing portion in such a way that the peripheral portion thereof is adhered to the wall member that surrounds the whole periphery of the opening, and closes the opening; and the containing portion is provided with a resin filled in the vicinity of the contained circuit unit.

Abstract: A rotating electric machine whose output characteristics can be easily and freely adjusted and varied even in operation. The rotating electric machine is received in a housing of an electrically driven two-wheeled vehicle. A rotating shaft is connected to a rotor so as to form an axle. A stator is positioned opposite a rotor. A movable member is connected to a rotating member rotated about the rotating shaft by a regulating motor. The movable member is moved in the axial direction of the rotating shaft by the rotation of the rotating member. This movement causes the rotor to be rotatingly moved in the axial direction of the rotating shaft, changing relative position of the rotor and the stator.

Abstract: The invention relates to a DC current machine, in particular a DC current motor for driving a blower of a motor vehicle, with a pole housing forming the stator of the machine, a rotor that is rotatably mounted in two bearing plates, and with a brush support for supplying current to the rotor. According to the invention, a support is integrated into the brush support, with de-tensioning for the electrical connecting cables of the machine, which means that a secure fastening, de-tensioning, and insulation of the connecting cables is achieved without additional components and without additional expense in the assembly of the machine.

Abstract: A stator structure includes a first cover, a stator assembly and a filler. The first cover has an accommodation space for accommodating the stator assembly therein. The filler is applied between the first cover and the stator assembly to surround the stator assembly. A manufacturing method of the stator structure is also disclosed.

Abstract: A generator rotor core (54) carrying superconducting windings (60) and having a shield (426) over the superconducting windings (60) to prevent external magnetic fields from impinging the windings. Axial shield edges (430/434) mate with corresponding features of the rotor core (54) or with structures affixed to or supported by the core (54) to support the shield (426).

Abstract: A motor housing and cooling fin assembly for an electric motor comprises a stator support having a longitudinal base and a series of fin plates protruding radially from the base, the fin plates for directing fluid coolant through the motor, a cylindrical support sleeve comprising a thin wall, the thin wall containing a series of slots for receiving distal ends of the fin plates; and a motor housing having a cylindrical inner wall, the support sleeve positioned between the stator support and the motor housing in an interference fit.

Abstract: According to an aspect of the present invention, there is provided a power tool including: a housing; a fan rotatably supported by the housing so as to generate an air flow; a wall portion supported by the housing; and a heat generation portion supported by the wall portion, wherein the wall portion has an exposing hole to expose a part of the heat generation portion so that the exposed part of the heat generation portion is positioned within the air flow.

Abstract: A drive unit, in particular for adjusting movable parts in a motor vehicle, has a housing including an opening to the surrounding, in which a gas-permeable, liquid-impermeable diaphragm is installed, the housing includes a first housing part with a circumferential collar, and a second housing part which closes off the first housing part, on the second housing part the opening is integrally formed with a circumferential mating surface, which presses the diaphragm against the collar of the first housing part after the housing is closed, and a sealing element located between the diaphragm and the mating surface is integrally non-detachably formed on the first and/or second housing part.

Abstract: A suction ring is fixed to a motor base and is provided with an outer circumferential section having a first outer diameter that is smaller than an inner diameter of a wall section of the motor base. A plurality of protruded sections each have a second outer diameter larger than the inner diameter of the wall section of the motor base and protrudes outward in a radial direction from the outer circumferential section of the suction ring. The plurality of protruded sections of the suction ring are press fitted into a wall section of the motor base and secures the suction ring to the motor base. One surface of the suction ring coincides with a bottom surface of the ring magnet covering a whole range of a projected area of the ring magnet that is projected onto the surface of the suction ring.

Abstract: In a vacuum cleaner blower (1) consisting of an electric drive motor (2) and a support cage (10) for receiving the structural modules of the drive motor such as stator pack (6), rotor (7) and brush holders (8) including carbon brushes (9) as well as an at least single stage blower unit driven by the motor including a deflector (11), impeller (12) and suction hood (4), the deflector being formed as a support cage lid including a bearing seat for the rotor (7) and the support cage (10) being formed for a mounting direction (C) of its structural modules in the axial direction of the blower and for direct contacting and the brush holder (8) of the carbon brushes being provided adjacent to the upper side (B) of the support cage which also faces the deflector (11).

Abstract: The present invention is to provide a water-repellent motor assembly for rotisserie and casing thereof, which comprises an inner shroud, a motor provided in the inner shroud and an outer shroud mounted around the inner shroud. A plurality of parallel bent, elongated projecting plates are projected out of an outer surface of the outer shroud. A plurality of second openings are formed on the outer shroud, correspond to the projecting plate, and are partially concealed by the projecting plates for preventing fluid from entering the outer shroud. The inner shroud comprises one or more recesses on its outer surface. A plurality of raised members are formed on an outer surface of the inner shroud and correspond to the second openings. The raised members are protruded toward the second openings and each of the raised members comprises a first opening formed on its projecting portion.

Abstract: The electric motor has a rotor (1), at least two magnet segments (2, 2?), a magnetic return path ring (3) and a housing (4) consisting of aluminum. The housing (4) has at least one helical projection (4?) on its outer side parallel to the longitudinal axis of the electric motor. An outer cover (5) in the form of a cup is arranged around the housing (4), the at least one helical projection (4?) resting against the inner side of said outer cover, wherein the outer cover (5) in the form of a cup has a coolant inlet (6) and a coolant outlet (7).

Abstract: A method may be used to retroactively install a grounding ring on an electrical motor used with an inverter to reduce the likelihood that shaft currents affect motor bearings. The method includes securing a ring of conductive material to an endplate of an electrical motor at a position that enables a shaft extending through the endplate to pass through the ring, the ring of conductive material includes conductive material that extends from the ring to contact the shaft when the ring is secured to the endplate, and covering the ring of conductive material with a bearing cap that has an opening that enables the shaft to pass through the bearing cap.

Abstract: A sealant containment gasket is provided for use on an electric motor to be used in a moist environment. The inventive gasket includes a first upright wall that covers a power-supply opening in the motor with a wiring passageway and further includes a second upright wall, at least a portion of which is spaced away from the first upright wall. The walls of the gasket cooperate to form a pocket to receive wiring extending through the opening in the motor. The pocket also defines a cavity between the walls with a filling hole disposed along a top margin thereof. Liquid sealant is inserted into the cavity through the filling hole when the motor is disposed right-side-up and on its feet in the assembly position. The liquid sealant is contained within the pocket and forms a barrier around the wiring passageway to prevent moisture from entering the motor.

Abstract: The present invention is used with a stopper mechanism for mechanically stopping the rotation of a motor. A pair of brushes is disposed such that a line which passes through the center of a rotor and connects the centers of the paired brushes is offset by a predetermined angle from a line which connects the centers of paired magnets. A commutator is disposed in such a manner as to be offset from a reference position by the same angle as the predetermined angle by which the paired brushes are offset. The predetermined angle falls within a range between an angle obtained by dividing 70° by the number of pairs of stator poles and an angle obtained by dividing 290° by the number of pairs of stator poles. Specifically, in the case of two stator poles, the predetermined angle falls within a range of 70° to 290° inclusive. In the case of four stator poles, the predetermined angle falls within a range of 35° to 145° inclusive.

Abstract: A motor includes a bracket that defines an exterior of the motor. A PCB is held within the bracket and has a circuit pattern and various elements mounted thereon. A stator is provided on the PCB and a rotor is provided within the stator. A shaft rotates together with the rotor to transmit a rotational force of the rotor. A stopper projects from an inside of the bracket to prevent the rotor from moving along the shaft.

Abstract: A motor may include a bearing made of resin for rotatably supporting one end part of the rotor shaft, and an urging member attached to a bearing holder and abutted with a pressurization face of the bearing to urge the bearing toward a side of the rotor shaft. A molding material injection gate trace (projection) which has been used when the bearing is resin-molded is positioned at a center portion of the pressurization face. The molding material injection gate trace may be positioned in a recessed part which is formed at a roughly center portion of the pressurization face of the bearing. Further, the urging member may include an urging piece which is formed by cutting a center portion of a metal plate in a ring shape and an opening part is formed in the urging piece.

Abstract: A fan housing for an electric machine includes a housing body for accommodation of the electric machine having a mounting flange for securement to a motor-driven element. The housing body defines a longitudinal axis and includes a cross-shaped or star-shaped configuration in vertical relationship to the longitudinal axis. Thus, when the electric machine is inserted in the fan housing, the corners of the mounting flange of the electric machine for attachment to the motor-driven element remain clear for easy access to screw fasteners.

Abstract: A dynamoelectric machine enabling stator winding temperature detecting precision of a temperature measuring means to be improved while also improving assembly of the dynamoelectric machine is provided. The dynamoelectric machine according to the present invention includes: a stator winding disposed in a stator; a temperature sensor for estimating a stator winding temperature of the stator winding; and a thermally-conductive bracket disposed between the stator winding and the temperature sensor. An estimated value of the stator winding temperature is calculated using a sum of a measured temperature measured by the temperature measuring means and a correcting value for correcting the measured temperature.

Abstract: An apparatus for controlling the starting and stopping of an AC induction motor, the apparatus comprises a first and a second magnetic permeable portions having a plurality of legs wherein a magnetic control flux of the second magnetic has an opposite magnetic polarity to the magnetic control flux of the first magnetic permeable portion; anon-spacer separating the first and second magnetic permeable portions to prevent magnetic control flux cancellation between the first and second magnetic permeable portions; a first and second AC power phase windings; and a first and second group of DC excitation control windings.

Abstract: The vehicle-use alternator includes a cooling fan rotating in one with a rotating shaft thereof to generate cooling air diffusing substantially in a radial direction of the rotating shaft, to thereby cool a stator thereof. A housing thereof rotatably supporting the rotating shaft and housing the rotor is provided with a plurality of supporting members circumferentially spaced on a periphery thereof to which the stator is secured, and a plurality of ribs formed on the periphery which are circumferentially arranged between the supporting members so as to form a plurality of cooling air discharge windows circumferentially arranged on the periphery. The ribs are inclined towards a downstream side with respect to a rotational direction of the rotor, and shaped that their inclination angles towards the downstream side between two adjacent ones of the supporting members reduce with increasing distance from a closer one of the two adjacent ones of the supporting members.

Abstract: An impeller includes a top shroud, a bottom shroud, and a plurality of vanes extending from the top shroud to the bottom shroud. The top and bottom shrouds are generally planar, and a lower edge of each vane tapers from an outer edge of the bottom shroud to a transverse tip edge thereof.

Abstract: Certain exemplary embodiments can comprise a system comprising a channel adapted to guide a coolant, the channel bounded at least in part by an inner channel wall defined by a motor housing adapted to substantially surround a stator of an electric motor, the inner channel wall adapted to conduct, to the coolant, heat generated by the stator.

Abstract: A vehicle alternator is disclosed having a stator, a rotor, a frame surrounding the stator and the rotor, a bowl-shaped end cover mounted on the frame and defining an electric component-part compartment, a brush unit held in sliding contact with slip rings of a rotary shaft, and a rectifier unit. The rectifier unit includes a terminal block embedded with A.C. conductive segments for multi-phase windings of a stator coil. The end cover includes a base wall portion and protective partitioned compartments axially protruding from a base wall portion of the end cover toward the frame at circumferentially spaced positions for the multi-phase windings, respectively, for surrounding at least one circumference of a connecting portion between an exposed end portion of each A.C. conductive segment and a diode lead and a connecting portion between the exposed end portion of each A.C. conductive segment and a stator lead.

Abstract: An assembly and method for mounting a stator in an inner stator motor that facilitates insertion and removal of the stator, militates against stator rotation during motor operation and allows the stator to be securely and accurately mounted. The assembly includes a motor housing having a hollow stator post, a stator, and a fastener.

Abstract: An electric motor/generator cooling mechanism is presented. The cooling mechanism includes a hollow cooling jacket having an inner and outer coaxial surface, where the inner surface defines a generally cylindric cavity for receiving a stator in heat transference contact with the inner surface, and the outer surface has a cast spiral groove section with jogged cooling passages. The disclosure includes an outer case having one or more inlet ports, an outlet port, and a vent for purging air, cooling fluid flowingly encased between the cooling jacket and the outer case, flowing through the jogged cooling passages, and a flanged end surface on an end of the outer case for boltingly connecting the cooling jacket to the outer case.

Abstract: An axial fan motor comprising: a fan having a rotating shaft and composed of a hub and a plurality of vanes provided around the hub, the fan rotating to generate an air flow; a stator substrate set comprising a stator core, which drives the fan, an insulator, and a substrate; and a venturi having a sleeve, into an inner peripheral side of which a bearing is inserted to support the rotating shaft and to an outer peripheral side of which the stator core is fixed, the venturi being formed on one side thereof with an air suction opening and on the other side thereof with an air discharge mouth, wherein a space is provided between the stator core and the sleeve.

Abstract: In a fan motor, there are provided protruding portions provided integrally with a base member so as to face a magnet and protrude toward the magnet, and openings facing the magnet, in the base member made of magnetic material. As to the positional relation between the protruding portions and the openings, when the protruding portions are positioned corresponding to centers of the magnetic poles, the openings are positioned corresponding to boundaries between the magnetic poles. As to the positional relation between the protruding portions and the coils, when the protruding portions are positioned corresponding to centers of the magnetic poles, both ends of the coils are positioned corresponding to positions other than the boundaries between the magnetic poles.

Abstract: A brushless AC generator is mounted on a vehicle such as a truck, a farming vehicle or a construction vehicle. The generator is composed of a housing, stator fixedly contained in the housing, a rotor, for supplying a magnetic field to the stator, rotatably supported in the stator, and other associated components including a voltage regulator and a rectifier. The housing is composed of a front housing and a rear housing. An outside fan is connected to a rotor shaft and disposed at a front side. Cooling air is introduced into the generator by the outside fan through windows formed in the rear housing. A fringe surface of the window facing a shoulder portion of the rotor is sloped, so that the cooling air is smoothly introduced along the sloped surface thereby to improve cooling efficiency.

Abstract: The vehicle-use generator driven by a vehicle engine at a rotating shaft thereof includes a rotor rotatably mounted to the rotating shaft, a stator fixedly located radially outward of the rotor, a cooling fan fixed to the rotor to rotate together with the rotating shaft in order to generate cooling air for cooling the stator, and a housing that houses the rotor and the stator and rotatably supports the rotating shaft. The housing is provided with ribs arranged in a circumferential direction of the rotating shaft so as to form cooling air outlet windows. The ribs are inclined with respect to a radial direction of the rotating shaft, and shaped such that widths of the ribs are gradually changed cyclically in the circumferential direction.

Abstract: A motor includes: a motor element with a rotation shaft; a speed reduction element having a rotation speed reduction device for reducing a rotation speed and a gear housing for accommodating the reduction device; and a water proof sheet. The gear housing includes: an accommodation portion having a communication passage and an accommodation concavity; and a cover having a breathing hole. The breathing hole has a cover side opening, which connects to an accommodation side opening of the communication passage. An inside of the motor element is connected to an outside of the gear housing through the breathing hole and the communication passage. The cover seals an opening of the accommodation concavity. The water proof sheet having water proof property and gas permeability is disposed between the accommodation side opening and the cover side opening.

Abstract: A motor cooling device including an impeller 2, supported by a rotary shaft 1a of a motor 1, and a fan cover 4, which encases a front portion and a peripheral portion of the impeller 2 and has an air inlet 5 in a front surface and an air outlet 6 in the rear. A constricting flow space S1 is arranged at an exit side of the impeller 2 and defined by a motor end surface 1b, which includes an entrance in the proximity of a rear surface of a vane 3 of the impeller 2 and a circumferential surface expanding radially and diagonally in the rearward direction, and a space formation member 10, which is formed on an inner surface of the fan cover 4.

Abstract: A ceiling fan motor includes a housing having top and bottom casing parts, a stator disposed in the housing and having a stator axis, and a rotor unit including a mounting seat that has an inner tubular wall surrounding the stator, an outer tubular wall spaced apart from and surrounding the inner tubular wall, and an intermediate web interconnecting the inner and outer tubular walls. The outer tubular wall is connected between the top and bottom casing parts. The rotor unit further includes a rotor supported by the inner tubular wall. The top and bottom casing parts have peripheral ends respectively overlapping top and bottom ends of the outer tubular wall.

Abstract: An electric machine includes a stator, a rotor positioned adjacent the stator and rotatable with respect to the stator, and a housing that at least partially surrounds the stator. An enclosure is coupled to the housing and includes a first compartment and a second compartment. A plurality of fins are positioned within the second compartment and a fan is coupled to the rotor and directs a flow of air through the second compartment.

Abstract: A motor includes a first housing, a second housing, a rotor and a stator. The second housing is assembled with the first housing to form an accommodating space. The second housing has a flange adjacent to the connection between the first and second housings. The rotor has a shaft extended outwardly from the second housing and disposed in the accommodating space. The stator is disposed corresponding to the rotor and in the accommodating space. The flange has at least one protruding portion. When the second housing is assembled with the first housing, the protruding portion presses against the stator and is deformed so that the first and second housings are sealed.