Abstract: A rotary machine includes a rotating shaft, a housing that surrounds a portion of the rotating shaft and has an initial pressure therein and a gas seal that pumps gas out of the housing to reduce pressure in the housing to an operating pressure that is less than the initial pressure.

Abstract: A joint assembly joins first and second components about a common axis. The first component has a first end portion having a radially outwardly facing surface shaped to fit radially inside a second surface of a hollow second end portion of the second component to form an interface between the opposing first and second surfaces. The first and second surfaces have a concavity extending laterally with respect to the axis such that when the first and second surfaces are opposingly arranged the opposing concavities define a cavity at the interface. A retaining member is insertable into the cavity at the interface to prevent axial separation of the first and second components. One of the first and second end portions has a free end protrusion axially spaced from the concavity and the other of the first and second end portions has an axially extending recess arranged to receive the free end.

Abstract: An electric machine has a stator, a rotor, and a slip ring module which is connected to a motor shaft of the electric machine. The slip ring module is equipped with at least one wire guiding channel, through which a respective contact wire is guided in order to electrically connect a rotor winding to a slip ring. A first section of the wire guiding channel runs from the slip ring in the axial direction parallel to the motor shaft. A second section of the wire guiding channel runs adjacently thereto radially outwards. An elastic seal element which surrounds the respective contact wire is arranged in or on the second section in order to seal the wire guiding channel to prevent a lubricant from entering the channel.

Abstract: In a method for connecting a housing cover to a cup-shaped housing structure for an electric machine, and a cup-shaped housing structure produced by means of the method, the cup-shaped housing structure has an opening and has an opening edge surrounding the opening. The housing cover is of cup-shaped form, wherein a collar of uninterrupted encircling form is integrally formed on a cup-shaped structure wall in the region of an opening edge, which collar points radially outward. In a first method step, the housing cover is at least partially inserted into the housing opening such that a channel is formed by mutually opposite regions of the housing cover wall and of the cup-shaped housing structure wall. In a further step, the channel is at least partially or completely filled with a sealing compound, which is in particular of elastic form, or an adhesive.

Abstract: A system, apparatus and method of determining remaining life of a bearing is disclosed. The method includes generating a bearing model of the bearing. The bearing model is based on one of condition data associated with operation of the bearing, historical condition data of the bearing, bearing specification and technical specification of a technical system including the bearing. The method further includes predicting a defect in the bearing based on the bearing model and predicting the remaining life of the bearing based on the predicted defect.

Abstract: A heat sink (30) for cooling an electric machine (10), includes: a first part of the heat sink (32) in the form of a hollow cylinder, wherein an inner lateral surface includes a groove (34) extending helically with respect to a central axis of the hollow cylinder; a second part of the heat sink (36) in the form of a hollow cylinder, which includes a radially internal fin (38); and a third part of the heat sink (40) in the form of a hollow cylinder, which includes a connecting section (52), in order to accommodate an output shaft (12) of the machine in a rotationally fixed manner. The second part of the heat sink is accommodated, at least partially, in the first part of the heat sink, so that a radially external surface of the second part of the heat sink rests against the groove.

Abstract: The invention relates to an electric winding body which has improved performance characteristics as a result of being impregnated with a thermoplastic material filled with phase change material. These performance characteristics relate to improved heat dissipation, vibration damping, fixing of the coils, and improved protection against overheating by utilizing the sensitive and latent heat storage properties when the polymer units transition from the semi-crystalline state into the amorphous state.

Abstract: An electrical submersible pump (ESP) isolates its motor lubricant from pumped product without requiring a bellows, diaphragm, bladder, or external lubricant pressurizing system. A pair of nested isolation chambers below the motor housing are filled with a barrier fluid that is non-reactive, non-miscible, and higher in density than the pumped product and the motor lubricant. As the motor lubricant expands and contracts after pump start-up and shut-down, motor lubricant and barrier fluid are exchanged between the motor housing and the isolation chambers via three interconnections, while pumped product is exchanged with the inner barrier chamber, while being isolated from the motor housing. The interconnections extend between the bottom of the motor housing and the bottom of the outer barrier chamber, between the top of the outer barrier chamber and the bottom of the inner barrier chamber, and between the top of the inner barrier chamber and the pumped product.

Abstract: A rotating electric machine drive unit includes a first rotating electric machine, a second rotating electric machine, a rotating electric machine housing, a power control unit having a first power conversion unit and a second power conversion unit, a first connecting member electrically connecting the first rotating electric machine and the first power conversion unit, and a second connecting member electrically connecting the second rotating electric machine and the second power conversion unit. When viewed from a rotation axis direction of the first rotating electric machine and the second rotating electric machine, the rotating electric machine accommodation portion of the rotating electric machine housing includes a bulging portion bulging outward between the first connecting member and the second connecting member, and the first rotating electric machine is accommodated in the rotating electric machine housing such that a part of the first rotating electric machine is located in the bulging portion.

Abstract: In order to facilitate the assembly of the brush assembly and to improve the productivity, the brush device includes a positive side brush subassembly having a positive side brush for feeding a commutator, a positive side brush holder for holding the positive side brush, and a positive side plate to which the positive side brush holder is attached, and a negative side brush subassembly having a negative side brush for feeding the commutator, a negative side brush holder for holding the negative side brush, and a negative side plate to which the negative side brush holder is attached. The positive side brush subassembly and the negative side brush subassembly are combined with each other.

Abstract: A compact, axially aligned brushless servo motor actuation unit configured to manipulate a choke valve to control the pressure within a borehole during managed pressure drilling. The actuation unit including a brushless servo, a gear reduction assembly and a planetary roller actuator substantially aligned along a longitudinal axis and housed within a tubular housing, the gear reduction assembly defining a hollow core sized to enable a portion of a roller screw of the planetary roller actuator to pass therethrough for the purpose of reducing the overall length of the actuation unit along the longitudinal axis.

Abstract: An electric compressor has a hermetic terminal unit that is electrically connected to a motor side wire and a drive circuit side wire and inserted through a through hole formed through a separation wall separating a motor chamber and an accommodating chamber. The hermetic terminal unit has a first connecting terminal that is electrically connected to the motor side wire and elastically deformable, a second connecting terminal that is electrically connected to the drive circuit side wire and elastically deformable, and a conductive member that is fitted to the first connecting terminal and the second connecting terminal and electrically connects the first connecting terminal and the second connecting terminal. The first connecting terminal is elastically deformed and holds the motor side wire by a restoring force thereof. The second connecting terminal is elastically deformed and holds the drive circuit side wire by a restoring force thereof.

Abstract: For improved water resistance, the stator assembly of a d.c. brushless motor is encapsulated in an overmolding formed from a mixture of a thixotropic, flexible epoxy resin and glass fibers. The overmolding may be applied to the stator assembly by a vacuum pressure impregnation process. The overmolding may also encapsulate a Hall effect circuit board and sensors of the motor.

Abstract: In a jacketed active magnetic bearing for a rotary machine having a rotor in contact with a process gas, there is provided a magnetic bearing comprising a bearing armature of laminated magnetic material secured to said rotor, a bearing stator protected by a first jacket of magnetic anti-corrosion material that co-operates with first housing portions to form a first leaktight housing enclosing the bearing stator, the first jacket being made of a ferritic stainless steel, and the first housing portions having insert parts that are also made of ferritic stainless steel, and that are connected by welds to a housing end-wall portion made of a magnetic anti-corrosion material, the laminated magnetic material forming the bearing armature and the detector armature also being a ferritic stainless steel.

Abstract: Rotor for motor or generator, which rotor (11) includes a rotor ring (12), which rotor includes a yoke formed by yoke segments (13) which by arrangement to the rotor ring (12) forms a complete yoke. The yoke segments (13) are provided with one or more magnet blanks (19), which magnet blanks (19) are formed by one or more permanent magnets (18).

Abstract: An electric motor assembly includes a shield that extends about a sector of the winding head to be disposed axially outboard of the outer axial end of the winding head and radially inboard of the inner diameter portion of the winding head. The shield defines a reservoir in which the sector of the winding head is received. The reservoir is operable to receive the coolant for cooling the winding head. Additionally, the motor assembly includes at least one sealing member that substantially seals at least one of the slots formed in an inner diameter portion of the stator core. The sealing member is operable to contain the coolant within the corresponding longitudinal opening and the reservoir.

Abstract: A motor structure includes a first silicon steel seat, at least one insulation support and a second silicon steel seat. The first silicon steel seat has a receiving space. The insulation support is disposed in the receiving space. The insulating support has a winding section. A first protection wall section and a second protection wall section are respectively formed on two sides of the winding section. The second protection wall section is formed with multiple through holes. Two ends of the second protection wall section are respectively formed with a first channel and a second channel. The second silicon steel seat is assembled and connected with the second protection wall section. The manufacturing cost of the motor structure is lowered and the manufacturing process of the motor structure is simplified.

Abstract: An electronically commutated DC motor for a liquid pump, comprising a pump housing, a suction connection and a pressure connection, a substantially disk-shaped pump rotor mounted rotatably in the pump housing, the rotor comprising an impeller having a plurality of pump vanes and a permanent magnet, a partition separating a pump space from a dry space, wherein the partition is disposed in an axial gap between the pump rotor and a plurality of axially parallel oriented stator poles of the DC motor, which are each provided with an insulating body and a stator winding, the stator poles adjoin a stator yoke, which is connected to a metallic heat-conducting body, and the stator containing the stator poles, the stator windings, the stator yoke and the heat-conducting body is disposed in a motor housing made of plastic material.

Abstract: In a motor driven by a drive circuit such as an inverter, there is a problem that electric current flowing through a bearing causes electric corrosion, which impairs the durability of the bearing. A motor of the invention includes: a stator in which a winding is applied through an insulating part to a stator core formed by laminating a predetermined number of electromagnetic steel plates which have been punched into a predetermined shape; a rotor assembly in which a rotor and bearings and formed by rolling bearings are fitted to a shaft; a printed wiring board which is arranged at an end part of the stator in an axial direction and to which a drive circuit is mounted; a bracket imposed to at least the end part of the stator in the axial direction to which the printed wiring board is arranged; and a conductive sheet provided between the printed wiring board and the bracket.

Abstract: A mechanically commutated electric motor is at least partially arranged in a closure apparatus for a housing. The closure apparatus includes at least a first rod-like throttle coil and a second rod-like throttle coil which are wound in opposite directions with coil wire and which are arranged parallel to one another. The first throttle coil is electrically directly coupled to a first coupling element provided for electrical coupling to the mechanically commutated electric motor, and the second throttle coil is electrically directly coupled to a second coupling element provided for electrical coupling to the mechanically commutated electric motor, such that, when the mechanically commutated electric motor is connected to the coupling elements and the mechanically commutated electric motor is operated, the magnetic fluxes (Phi1, Phi2) in the first throttle coil and second throttle coil at least partially compensate one another.

Abstract: There is provided a spindle motor including: a sleeve rotatably supporting a shaft and having an insertion groove provided in a top surface thereof; and a rotor case mounted on a top end of the shaft and including a protruding wall part inserted into the insertion groove, wherein a lubricant, provided to generate a dynamic pressure when the shaft rotates, forms an interface with air in a clearance formed by the protruding wall part and the insertion groove.

Abstract: A dynamoelectric machine, such as a totally enclosed fan cooled (TEFC) induction motor has a double-wall bearing housing heat shield that envelops and thermally isolates the bearing housing from the rest of the motor housing interior. The shield defines an air channel between the shield outer and inner walls. Optionally the air channel may be constructed to enable circulating air flow through a shield intake in communication with an air flow source, such as air ducted from the TEFC motor axial cooling fan. The air channel also defines an exhaust. Air flow within the air channel transfers heat out of the motor housing, lowering bearing housing operating temperature. Air flow rate may be varied in response to motor operational parameters.

Abstract: A starter motor including a frame having a terminal mounting portion, and a field fixedly mounted relative to the frame. An armature is rotatably supported relative to the field. A conductor having a terminal mounting section is electrically connected to one of the field and the armature. A terminal extends through the terminal section of the conductor and the terminal mounting portion of the frame. The terminal includes a plurality of threads. A conductor mounting element threadably engages with the plurality of threads. The conductor mounting element is configured to form a threaded clamped connection that establishes a solid metal compressive stack up connection between the conductor and the terminal.

Abstract: Disclosed herein is a system including a motor comprising a rotor, a stator and a sealing assembly having at least one joint and a monolithic ceramic separator. Each joint of the sealing assembly is a chemical bond joint, and the monolithic ceramic separator is disposed in a gap between the rotor and the stator of the motor such that the sealing assembly hermetically isolates the rotor and the stator.

Abstract: A motor includes a stator and a rotor disposed in the stator. The stator includes a housing and a plurality of magnets attached to an inner surface of the housing. The rotor includes a shaft, with a rotor core and a commutator. Windings are wound on the rotor core and terminated on the commutator. The rotor core includes a plurality of teeth extending outwardly about which the windings are wound. Radially outer surfaces of the teeth are coated with a Zn-Al film.

Abstract: The present disclosure describes an electric motor that includes a case and a shaft at least partially disposed within the case. A bearing mechanism may also be disposed within the case, and the bearing mechanism may have a first side and a second side opposite the first side. An oil mist inlet may be positioned adjacent to a first side of the bearing mechanism and be in fluid communication with the bearing mechanism. An oil mist outlet may be positioned adjacent to the second side of the bearing mechanism and be in fluid communication with the bearing mechanism.

Abstract: There are provided a sealing resin composition for a hard disk drive (HDD) motor and a HDD motor fabricated by using the same. The sealing resin composition includes: 45 to 65 parts by weight of urethane methacrylate resin; 35 to 50 parts by weight of methacrylate resin; and 2 to 4 parts by weight of acrylic acid. A sealing resin composition having a new composition is used as a sealing material of a FPC adhering part of the HDD motor, whereby a haze phenomenon due to air leak and outgas at the FPC adhering part may be improved and reliability of a HDD motor may be enhanced due to a reduction in generation of the outgas of the adhering part.

Abstract: A power supply cable including high voltage wires and connectors for a traction motor, charger, upper battery pack and lower battery pack. The power supply cable includes a clamshell shield housing that protects the cable as it is routed over a rear seat pedestal. A two-piece grommet is provided to seal between the passenger compartment and the underbody of the vehicle and includes a rigid attachment ring and a seal that seals the passenger compartment from the environment below the vehicle.

Abstract: The invention relates to a windscreen wiper drive arrangement (1) having a drive shaft (4), extending out of a gear mechanism housing (3), for a windscreen wiper, in which the drive shaft (4) is guided axially through a protective sleeve (15) which is sealed with respect to the drive shaft (4) by means of at least one inner sealing element (18) and with respect to a vehicle component (11) by means of at least one outer sealing element. The invention provides for the protective sleeve (15) to be secured to the gear mechanism housing in order to protect said protective sleeve against axial movement in the direction of the vehicle component (11) and/or against rotational movement relative to the gear mechanism housing (3) by frictional engagement and/or by means of at least one separate securing element (25).

Abstract: A brush unit for an electric machine has a simple and low-cost but robust design, and can be assembled at low-cost using simple process steps comprises four ring-shaped board elements are stacked on each other, namely two outer circuit boards, each of which is electrically conductively connected to one or more brushes. Two guide boards made of electrically insulative material disposed therebetween, comprise a shape having protrusions and recesses for forming radial guides for the brushes and receptacles for springs acting on the brushes. The springs are spiral springs wound around a mandrel, the flat ends thereof protruding past the springs being rotationally fixedly guided in a guide groove of each receptacle and able to engage behind a stop. In order to assemble the brush unit, the circuit and guide boards are stacked on each other in the axial direction and riveted, then the brushes are inserted in the guides in the radial direction and the springs are placed in the receptacles.

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: What is claimed is a downhole tool string component comprising a generator. The generator may comprise a toroidal stator comprising an interior channel formed between inward extending stator poles. A coil of wire is disposed within the interior channel, and a plurality of magnets are rotatably disposed proximate each pole. A downhole tool string component comprises a bore to receive a flow of drilling fluid comprising a central passage and at least one peripheral passage. A compliant member is disposed within the bore and forms an internal diameter of the central passage, and at least one opening. The at least one opening comprises an internal area within the compliant member to divert the flow of drilling fluid into the at least one peripheral passage. The compliant member comprises a compliant property allowing the internal area of the at least one opening to change thus changing the amount of diverted drilling fluid.

Abstract: An integrated stator flange assembly is disclosed. In one embodiment, the integrated stator flange assembly may have an outer surface and include: a stator flange; and a flux shield bonded directly to the stator flange, the flux shield forming a portion of the outer surface of the integrated stator flange assembly.

Abstract: A drive device includes a rotating electrical machine; a control device that controls the rotating electrical machine; and a case that accommodates the rotating electrical machine and the control device. The case includes a machine chamber that accommodates the rotating electrical machine, and an electric chamber that accommodates the control device. The machine chamber and the electric chamber are separated from each other by a partition wall, and a connection member that electrically connects the rotating electrical machine and the control device to each other is provided so as to extend through the partition wall in a fluid-tight state. Each of the machine chamber and the electric chamber has an opening on one axial end side of the rotating electrical machine, and a cover that covers the openings in a separated state from each other is mounted to the openings.

Abstract: A shaft support system 7 for an electric motor 1, comprising a rolling bearing 17 provided with an inner race 33 and an outer race 34, at least one angular position sensor 20 for detecting the angular position of the inner race, an encoder 19 mounted on the inner race, a flange 16 for supporting the outer race of the bearing, and a processing module 18 supported by the flange.

Abstract: According to one embodiment, a spindle motor includes: a bearing portion fixed to a base and configured to have a cylindrical outer shape; a stator provided with a core serving as a magnetic pole, and fixed to the base outside the bearing portion; a hub provided with a magnet facing the core, and rotatably supported by the bearing portion; and a shielding structure including: a shielding plate configured to shield airflow between the stator and the hub; a first elastic member configured to attach the shielding plate closely to the bearing portion at a top end of a cylindrical outer shape of the bearing portion; and a second elastic member configured to attach the shielding plate closely to the base at the region spreading outwardly from an outer end of the hub.

Abstract: There are provided a tubular stator core having a plurality of tooth portions which protrude radially inwards and slots which are defined between the respective tooth portions and coils which are disposed on circumferences of the tooth portions. An insulator is attached to the stator core from an axial direction thereof for isolating the coils from the stator core. A radius of curvature of a corner portion of the insulator around which the coil is wound decreases continuously as the tooth portion extends from a root portion to a distal portion thereof.

Abstract: An electric motor has a rotor, a stator encompassing the rotor, at least one bearing bracket, and a rotor cover. The rotor cover has at least one cover cap extending from the bearing bracket to at least the front face of the stator, which faces the bearing bracket. The invention also relates to a rotor cover for an inner rotor motor, having at least one cover cap and cover fins adjoining the cover cap. The cover cap has a tapering portion from the side where the cover fins are mounted. The cover fins have a length corresponding to at least half of the length of the stator of the electric motor.

Abstract: A salient pole machine and method of forming the same comprising a rotating field assembly and at least one inter-pole cap connected to the rotating field assembly and/or at least end coil cap connected to the rotating field assembly. Each inter-pole cap preferably includes a top surface that has a curvature and/or at least one cavity. Each end coil cap may include at least one support. The salient pole machine may also include at least one fan assembly independent of the rotating field assembly. In a preferred embodiment, the salient pole machine includes at least one mounting plate, wherein each fan assembly is mounted on the mounting plate. The inter-pole caps and the end coil caps preferably comprise composites, polymers, alloys, ceramics, or naturally occurring materials.

Abstract: An energy storage system comprises a housing and a flywheel having a drive shaft portion attached to a cylindrical ferromagnetic rotor portion. The drive shaft portion defines a substantially vertical axis about which the rotor portion is mounted for rotation. A magnetic bearing assembly comprised of an annular permanent magnet having no electromagnetic components is mounted on the housing in stationary centered relation about the vertical axis above the rotor portion so as to attract the rotor portion axially upwardly towards a lower face of permanent magnet, thereby supporting a significantly high portion of the weight of the flywheel. At least one low friction mechanical bearing assembly is mounted within the housing about the drive shaft portion to provide radial positioning of the rotor portion and to limit at least upward axial movement of the rotor portion in relation to the lower face.

Abstract: A brushless motor to be used for driving a vane pump, which is employed in a module for inspecting vapor leakage of fuel, is disclosed. The brushless motor includes a mounting plate having a through hole, and an annular space is formed between an inner wall of the through hole and an outer wall of a projection of a motor housing. This annular space allows preventing a welding current from flowing into the projection.

Abstract: A brushless motor includes a substantially flat attachment plate and a circuit board. The attachment plate includes a plurality of motor attachment portions and a base portion arranged to interconnect the motor attachment portions. The circuit board is arranged on an upper surface of the base portion and includes a first area to which electronic parts are attached. The upper surfaces of the motor attachment portions are arranged higher than the upper surface of the base portion. The height of the upper surface of the circuit board in the first area is substantially equal to or greater than the height of the upper surfaces of the motor attachment portions.

Abstract: A shaft seal assembly is disclosed having a stator including a main body and axial and radial projections therefrom. The rotor may be radially extended to encompass the axial and radial projections from said stator. A passageway formed between the radial projection of stator and rotor results in an axial passageway having its opening facing rearwardly from the rotor and away from the source of impinging coolant and/or contaminant. A concentric circumferential receptor groove in the stator facing the housing allows insertion of a conductive insert for transmission of electrostatic charge away from the shaft through the shaft seal assembly to the housing and ground. The receptor groove is opposite the axial passageway and provides for both a substantially lower contaminant environment and improved engagement with the conductive insert.

Abstract: A windshield wiper drive (1) is provided for the output shaft (4) with a protective cap (15) across a longitudinal region. The protective cap (15) is supported between the terminal supports thereof against the drive shaft (4) and the drive housing (2) of the windshield wiper drive (1) in relation to the output shaft (4) via a supporting bearing (20).

Abstract: A cooling module includes a shroud (38) having an integral cover (42). The cover receives a bearing structure (40). A fan (36) is provided for moving air. A rotor and stator assembly (30) has an opened end and includes a stator (29) having permanent magnets. A rotor (31) includes a lamination stack (16), windings (21), a commutator (20); and a shaft (18). The rotor is associated with the stator so as to rotate with respect thereto. One end (34) of the shaft is coupled with the fan and another end (39) of the shaft is received by the bearing structure. A brush and connector unit (52) is associated with the cover of the shroud and includes brushes (58) associated with the commutator, and an electrical connector (62). The cover covers the opened end of the rotor and stator assembly and covers at least a portion of a brush and connector unit.

Abstract: A resolver fixing structure which does not cause distortion at a resolver stator is provided. The resolver fixing structure arranged between coil ends of a stator constituting a rotating electrical machine includes a ring portion as a base member having a hole, and a resolver stator press-fitted into the hole. The resolver stator has an outer circumferential portion provided with a shield member coming into contact with the hole.

Abstract: An inverter-integrated rotating electric machine includes an enclosure in which a vent hole is formed, an AC motor accommodated in the enclosure, the AC motor including a rotor and a fan whose rotation introduces external air into the enclosure from outside through the vent hole, the fan being fixed to the rotor, and an inverter unit accommodated in the enclosure and disposed in the vent hole. The inverter unit includes a power circuit portion and a control circuit portion whose control board is housed in a case which thermally isolates the control board from the power circuit portion. The power circuit portion is located at a position facing the fan and the control circuit portion is located upstream of the power circuit portion with respect to an inflow of the external air. Signal lines from the power circuit portion are connected to signal lines from the control circuit portion through holes formed in the case.

Abstract: Provided is a brushless alternator for preventing water from penetrating further inside through a gap between a distal end portion of a spool and a concave portion of a bracket. According to the brushless alternator of the present invention, a rotor includes: a rotor main body; and a coil body (30) fixed to a rear bracket (21). The coil body (30) includes: a bobbin (32); a field coil (13); a yoke portion (10) of a second magnetic pole, the yoke portion (10) having one lateral surface being in close contact with a lateral surface of the bobbin (32) and another lateral surface being bonded to the rear bracket (21); a spool (31) provided on an inner circumferential surface of the yoke portion (10) and an inner circumferential surface of the bobbin (32); and a rubber bush (101) provided to a projecting portion (312) at a distal end of the spool (31).

Abstract: A brush unit for an electric machine has a simple and low-cost but robust design, and can be assembled at low-cost using simple process steps comprises four ring-shaped board elements are stacked on each other, namely two outer circuit boards, each of which is electrically conductively connected to one or more brushes. Two guide boards made of electrically insulative material disposed therebetween, comprise a shape having protrusions and recesses for forming radial guides for the brushes and receptacles for springs acting on the brushes. The springs are spiral springs wound around a mandrel, the flat ends thereof protruding past the springs being rotationally fixedly guided in a guide groove of each receptacle and able to engage behind a stop. In order to assemble the brush unit, the circuit and guide boards are stacked on each other in the axial direction and riveted, then the brushes are inserted in the guides in the radial direction and the springs are placed in the receptacles.

Abstract: A shield member (90) is arranged on the rotor end face (18a) of an electric rotating machine (10). As the rotational velocity of a rotor (18) increases, the shield member (90) moves outward in the radial direction of a rotating shaft (12) to cover a part of the opening (86) of a slot (82). The shield member (90) controls inflow of lubricant from a portion in the axial-direction of the rotating shaft (12) on the outside of the rotor end face (18a) to the slot (82). Rotational resistance of the rotor (18) caused by stirring of lubricant can be reduced during high velocity rotation of the rotor (18).