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: The present invention relates to a motor rear case, which is mounted on a motor case with a connecting bore. The motor rear case includes a main body and a plurality of protrusions. The main body has an annular plug, on which the protrusions are provided. The annular plug is inserted into the connecting bore and the protrusions make an interference fitness that provides a firm connection between the motor rear cover and the motor case.

Abstract: Provided is a starter that can ensure stable insulation and exhibits excellent leakage resistance. The starter includes: a starting motor realized with a dc motor that has a commutator, positive brushes which are disposed around the commutator to abut on the commutator and connected to an external power supply, negative brushes, which are opposed to the positive brushes, stored in a bracket bearing one end of a rotation shaft; and a starting switch that is mounted on the starting motor and electrically connects or disconnects the external power supply to or from the positive brushes. When an engine is started, the starting motor is driven with the external power supply via the starting switch, and the starting motor is mechanically coupled to the engine. Herein, the starting motor has an insulating member disposed only on the internal surface of the bracket neighboring the positive brushes.

Abstract: A miniature cooling device includes numerous improvements capable of increasing the reliability and useful lifetime of the device, as well as improving electrical power to cooling power conversion efficiency. The improvements include a DC motor shaft design that incorporates a flywheel mass 314 with a solid shaft cross-section 300 for increasing shaft stiffness and magnetic flux density in the DC motor. Additional improvements include a bend resistant flexible vane 1114 in the DC motor to compression piston drive coupler, and a sealed cover set configured to be removable to make a motor repair and then replaced.

Abstract: A rectifier assembly includes first and second housings surrounding a pair of electrical rings. Each of the electrical rings communicates with a pin. Bolts secure a spring to hold diodes against an inner wall of the electrical rings. The first housing includes openings opposed to the bolts to allow access to the bolts for tightening the bolts to hold the spring, and bias the diodes against the inner periphery of the electrical rings. A rotor balance assembly, a generator, and a method of assembling a rectifier assembly are also disclosed and claimed.

Abstract: The invention relates to an electrical motor (10), comprising a shaft (24), a housing (12) with a housing flange (14) and a bearing plate (16) with a bearing plate flange (18), whereby one end of the shaft (24) projects out of the bearing plate (16). The housing flange (14) and the bearing plate flange (18) are connected by means of at least one hollow rivet (20) such that the electrical motor (10) may be mounted by means of a fixing element, in particular, a screw, through the hollow rivet (10) on a connector flange of a gear stage in a working connection with the projecting end of the shaft (24). In one method for connection or said electrical motor (10) to a connector flange, the electrical motor (10) may be mounted by means of a fixing element, through the hollow rivet (10) on a connector flange of a gear stage in a working connection with the projecting end of the shaft (24).

Abstract: An electric compressor includes an electric motor, a compression mechanism driven by the electric motor, and a housing for accommodating the electric motor and the compression mechanism. The housing is formed such that the stator is fitted thereto. The housing has a plurality of thick portions and a plurality of thin portions. The center of the thickness of each thick portion is located outside of the center of the thickness of each thin portion with respect to a radial direction of the housing. As a result, even if the housing is deformed, the fixation of the stator to the housing is reliably maintained. Further, the weight of the electric compressor is reduced.

Abstract: A compressor includes a compression mechanism, a motor coupled to the compression mechanism via a driving shaft, and a casing to accommodate the compression mechanism and the motor. The motor includes a stator, and a rotor disposed inside the stator and coupled to the driving shaft. The stator is spot-joined to the casing via a plurality of stator spot-joined portions at different positions along a circumferential direction about the driving shaft. Preferably, the stator spot-joined portions are disposed at different axial positions. Also, the stator spot-joined portions are preferably disposed at different circumferential positions from positions of compression mechanism-side spot-joined portions. When an accumulator is connected to the casing via a connection pipe, a straight line between any two of the plurality of stator spot-joined portions preferably crosses a vibration direction of a natural vibration mode of the accumulator.

Abstract: An electric motor has an end cap assembly comprising: a base and a cover. The base has a first chamber configured to receive a commutator, a second chamber configured to receive electronic components, and brush boxes having passages configured to receive brushes. The first chamber and the second chamber are respectively formed on opposite sides of the base. The passages of the brush boxes open into the first chamber to allow the brushes to slidably contact a commutator disposed therein. The cover is fixed to the base and covers the second chamber.

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: To protect the bearings, lubricant and seals of a refrigerant compressor, the compressor includes one or more inductors for mitigating a high frequency common mode current that produces a high frequency shaft voltage. Each inductor is a ring of magnetic material encircling three insulated cables that convey three-phase power from an adjustable frequency drive to the compressor's motor. Without the inductors, the high frequency shaft voltage can become damagingly high due to the length of a cast iron housing that can be particularly long if the housing contains both a motor and several centrifugal impellers. The high frequency shaft voltage is just one component of a composite adverse shaft voltage. Another component, known as an operationally induced shaft voltage, can be reduced by a grounding contact, so instead of using just an inductor or just a contact, both can be used to provide a total solution to the problem.

Abstract: The stator of an electric rotating machine includes a stator core constituted of a plurality of split cores joined to one another in a ring, a plurality of phase windings wound around the stator core, and an outer casing to an inner periphery of which an outer periphery of the stator core is fitted with clamping margin therebetween. The outer casing is provided with a brim including at least two brim portions at at least one of axial ends thereof. The brim portions are spaced from each other in a circumferential direction of the outer casing and project in a direction receding from a center axis of the outer casing.

Abstract: The present invention relates to a fan motor is for forced circulation of cool air in the refrigerator and comprises a molding unit, a shaft bearing unit, a rotor and an end cap. The molding unit comprises a stator having a shaft bearing unit mounting hole in the center thereof and core teeth which protrude radially outward so that a coil is wound thereon; and a circuit board having a circuit and a device which are electrically connected to the coil of the stator. The shaft bearing unit is inserted and fixed in the shaft bearing unit mounting hole. The rotor has a magnetic ring formed on the inner surface of a cup-shaped rotor housing, and a rotating shaft is fixed at the bottom center of the rotor housing. The end cap whose edge is connected to a side wall of the molding unit covering the rotor.

Abstract: In a converter motor, the converter unit and the electric motor together form a mechatronic unit. The converter unit is located behind the electric motor and is thermally coupled with the rear bearing shield. The converter unit includes a through hole, through which the rear end of the motor shaft passes. A contactless position detector is located in the region of this through hole.

Abstract: A hiding structure for positioning signal conversion mechanism of a torque motor, which includes a stator having a curvature center line, a rotor coaxially fitted with the stator, a positioning/detecting section disposed on the stator between the stator and the rotor for detecting movements of the motor and outputting corresponding analog signals and a signal conversion section for receiving the analog signals provided by the positioning/detecting section and converting the analog signals into digital signals and outputting the digital signals. The signal conversion section is fixed on an end face of one end of the stator in an insulated state.

Abstract: The present invention provides a linear motor device that can reduce a variation in thrust caused by a variation in attractive force. The linear motor device includes a linear motor 1 and a control section 30 that controls the linear motor 1. The linear motor 1 includes a magnet member 2 composed of permanent magnets having respective N poles and S poles alternately arranged in an axial direction, and a coil member 3 which is located orthogonally to the axial direction with respect to the magnet member 2 and through which the magnet member 2 is movable in the axial direction relative to the coil member 3. The control section 30 controls current conducted through the coil member 3 so that a moving one of the magnet member 2 and the coil member 3 reciprocates within a use range L corresponding to a part of a pitch p between the magnetic poles N and S in the magnet member 2.

Abstract: A generator housing includes a top portion, a plurality of side portions, and a base portion. The top, sides, and base portions are connected to form an enclosure, such that a generator can be housed inside the enclosure. The top and side portions include an air and exhaust flow structure that facilitates cooling of a generator maintained inside the housing, that provides a sound attenuation function, and that releases exhaust created by a generator. At least one of the side portions and the top portion may be opened and closed to provide access inside the housing. The base portion includes a structure that facilitates installation and transport.

Abstract: A linear actuator includes permanent magnet annuli arranged about an armature core for axial movement in a tubular stator upon energization of coils arranged in concentric association with the armature. The stator has portions extending radially inwards of the coils and towards one another beneath each coil, which define a spacing between the coil and the armature. The annuli have a substantially radially magnetized structure and the coils are configured for single phase power input. In one embodiment (FIG. 6), two pairs of spaced annuli are arranged on the core, wherein the axial length of the outermost annuli is half the axial length of the inner annuli.

Abstract: A step-by-step motor able to carry out up-and-down transmission includes a housing, a top rod, a circuit board, a magnet, a coil unit and a cover. The top rod is inserted in an insert hole of the housing, having a wall bored with a cut recess. The circuit board has a position-limiting switch received in an engage groove of the housing and provided with a sidewise rod inserted in the cut recess of the top rod. The magnet is fixed with a connecting member connecting a bearing, and the lower end of the top rod is engaged with the connecting member. The coil unit is fitted around the magnet and positioned in the housing, and the cover is covered on the bottom of the housing. The magnet is driven by the coil unit to rotate and actuate the top rod to move upward or downward steadily.

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: The invention provides for a motor attachment assembly that includes an electric motor having spring clips adapted to securely lock onto the isolation posts of a plastic post vibration isolation system. The motor includes an end cap that has notches which cooperate with locator tabs of the motor housing to lock the cap onto the housing with the spring clips therebetween. Each clip includes an axial slot that is expandable in an open direction to receive an isolation post and biased in the closed direction to retain the isolation post. Each clip also has an inner surface with barbs protruding into the channel to allow insertion of the isolation post into the channel in the direction of the output shaft and to resist movement of the isolation post in a direction opposite to the output shaft. The inner surface has a retention groove to receive plastically deformed portions of the isolation post.

Abstract: A power tool has a motor having a stator made by separately forming pole pieces, return path pieces and field coils. The field coils are placed over necks of the pole path pieces and the return path pieces are affixed to the pole pieces. An armature having an outside diameter of at least 0.625 the outside diameter of the stator is placed in the stator. The field coils may be formed so that they extend beyond pole tips of the pole pieces.

Abstract: An inner rotor type molded motor controlled by pulse width modulation using an inverter circuit includes a pair of electrically conductive brackets attached to a load-side portion and an anti-load-side portion of a motor frame. An electrically conductive tape is attached on the outside of the motor frame to extend between the brackets, thereby short-circuiting the brackets to each other. In this manner, electrical erosion in the molded motor can be prevented.

Abstract: The present invention relates to a fixing structure for printed circuit board (PCB) of micro motor, including a base and a PCB. The base has a shaft tube disposed centrally therein; at least a circuit board fixing pin is protruded beyond the base peripheral to the shaft tube; the PCB has a center hole for the shaft tube to be inserted in, and the diameter of the center hole shall be close to but not less than the outer diameter of the shaft tube; each circuit board fixing pin corresponds to a through hole disposed on the center of the PCB. Sensing plates are prevented from dropping to secure the motor to stably rotate; the circuit board fixing pin, after passing through the through hole, is fixed by an adhesive or a soldering means to make the PCB and the base perfectly fit and free from warp and vibration.

Abstract: The invention is based on an electrical power tool with an electrical machine, having a motor housing that receives the electrical machine and having a rotatable brush plate for reversing a direction of rotation of the electrical machine. The brush plate is covered in its cross section by a pivotable cover.

Abstract: A yoke is produced by rolling up Zn—Al—Mg platinized steel plate of corrosion-resistance treatment where both ends thereof are tightly mated. On the outer peripheral surface of the yoke, plural linear grooves extending in the axis direction of the yoke are formed at a constant interval in the rolling step. Because the steel plate of corrosion-resistance treatment is prepared before initiating the rolling step, it is not necessary to perform coating and electroplating after making a cylindrical shaped yoke, namely, not necessary to perform any coating and electroplating after making the yoke, and the grooves are not filled with reaction products. This increases the radiation capability of the yoke because of increase of the entire surface area of the yoke. The Zn—Al—Mg platinized steel has a silver color and hardly absorbs radiant heat from an engine of a vehicle, and suppresses the increasing of the yoke temperature.

Abstract: The invention provides a press in style motor attachment mount assembly. The assembly includes a motor and a vibration isolator. The motor has an end portion axially remote from the output end and a stop facing the output end. The vibration isolator includes a cup that axially receives the end portion of the motor. The cup includes an end wall, a sidewall, and flexible fingers integrally connected to the sidewall. The flexible fingers have a flexed position in which the tip of the flexible finger is disposed radially outwardly to allow axial assembly of the end portion of the motor into the cup and a locking position where the tip engages the first radial stop to prevent axial detachment of the motor from the cup.

Abstract: A counter-rotating axial-flow fan is provided that is capable of increasing effect of cooling a stator. One or more through-holes 83 penetrating support frame bodies (21, 75) in the axial direction are formed in support frame bodies 21 and 75. One or more vent holes 57a for introducing air, sucked from a suction port 19, into a cup-like member 51 are formed in a bottom wall portion 57 of a cup-like member 51 of a first impeller 9. One or more vent holes 111a for discharging air, introduced into an internal space of a second motor 61, to the outside are formed in a bottom wall portion 111 of a cup-like member 105 of a second impeller 63.

Abstract: A motor includes a stator core that forms a magnetic path and has a plurality of tooth parts along a circumferential direction; a tooth provided in each tooth part to wind a coil there around; and an extension part alternated with the tooth part along a circumferential direction of the stator core, convexly extending to an inner radial direction.

Abstract: The present invention enables firm fixation between a motor casing and a casing lid at low cost through employment of a simple structure without need to use adhesive. A casing lid made of resin is fixedly fitted to an opening portion of a motor casing made of metal. Grooves or depressions are provided at the bottoms of a plurality of fixation portions provided on the casing lid at constant intervals in the circumference direction thereof. Bend portions at the opening portion of the motor casing are caused to bite into the grooves or depressions of the casing lid fitted into the opening portion of the motor casing, whereby the motor casing and the casing lid are fixed together.

Abstract: An airtight-type electric motor capable of reducing vibration is provided. Inside ribs of a pair of end brackets and are respectively fitted into core end portions of a stator core. Outside ribs of the pair of end brackets and are respectively brought into contact against end surfaces of the core end portions of a yoke of the stator core. With this arrangement, the pair of end brackets and are fixed to the stator core, and a housing and the stator core are arranged, without being coupled together.

Abstract: A motor case assembly 20 a permanent magnet D.C. electric motor includes a motor case 24 having a generally cylindrical wall 25, a closed end 21, and an open end 23 opposite the closed end, defining an interior 27. Permanent magnet structure 26 is mounted to the wall 25 in the interior 27. A surface defines at least one hole 22 through the wall 25. The hole 22 is constructed and arranged to be employed in mounting the case 20 to a shroud to obtain a mass balance distribution of a motor shroud assembly.

Abstract: A motor mounting device includes a polymeric motor housing having a cylindrical housing section for receiving motor components including a rotor. The housing section incorporates a detent feature disposed along the interior surface, with the interior surface inclined to gradually converge in a distal direction. The housing further has a distal end section that includes a first bearing seat centered on the housing axis. A rotor retaining member has an annular outer surface terminating at an arcuate peripheral edge, and comprises a second bearing seat. The rotor retaining member is insertable distally into the cylindrical housing section, following insertion of a rotor, to engage the first and second bearing seats respectively with distal and proximal bearings on a rotor shaft, to secure the rotor for rotation relative to the housing. During such insertion, the retaining member outer surface and the interior surface of the cylindrical housing section interact to center the retaining member.

Abstract: In attachment structure for motor assembly, accommodating portion with a bottom is formed in housing such that the motor assembly including commutator motor and brush holder unit is accommodated therein with the brush holder unit facing downward. Receiving portion for positioning the brush holder unit is formed in the accommodating portion. Abutment portion is formed on the brush holder unit for positioning between stator and the brush holder unit. The motor assembly is positioned within the accommodating portion such that the brush holder unit is in contact with the receiving portion and that the stator and the brush holder unit are brought into contact with each other through the abutment portion. Fixing member is inserted from an open side of the housing, brought into contact with the stator, and fixed to the housing, so that the motor assembly is interposed between the fixing member and the receiving portion.

Abstract: A motor stator mounting device includes a plastic motor housing having a cylindrical housing section for receiving the stator. Longitudinal ribs along an inside surface of the housing section are inclined to converge gradually in a distal direction, thus tending to center a stator inserted distally into the housing section. An annular stator retaining member includes a plurality of distally extending centering features. Outside surfaces of the centering features interact with an interior surface of the housing section to center the retaining member as it is inserted distally. Inside surfaces of the centering features interact with a proximal region of a previously inserted stator, such that distal insertion of the retaining member both axially positions and radially centers the stator relative to the cylindrical housing. The retaining member is secured to the housing with a series of sonic welds to positionally fix the stator inside the housing.

Abstract: A turbomachine such as an aircraft turbojet including an electrical generator/starter that can be mounted and dismounted by axial translation in an upstream enclosure of the turbomachine between the low-pressure compressor and the high-pressure compressor, and couple to electrical cables which extend inside the structural arms of the intermediate casing of the turbomachine.

Abstract: A fluid dynamic bearing is configured that a distance L1 from an annular region of a cover member along a direction of an axis of rotation to a first thrust bearing surface of a radial bearing member, and a distance L2 from a stopper surface of a stopper portion to a second thrust bearing surface of a thrust bearing member, satisfy the following relationship: L1<L2, wherein the annular region of the cover member is in contact with the stopper surface of the stopper portion, and the first thrust bearing surface of the radial bearing member is separated from the second thrust bearing surface of the thrust bearing member to form a gap being filled with a lubricant fluid when the radial bearing member is in non-rotating state with respect to a stationary shaft.

Abstract: An electromotor for regulating a drive in a motor vehicle. The electromotor includes an armature spindle mounted in a pole housing that includes a shell. At least on one front side of the shell a bearing cover is coupled thereon to accommodate an armature spindle bearing. The electromotor also includes a radial molding formed on the pole housing that receives a guide track of a gear assembly housing via radial insertion to fasten the electromotor to the gear assembly housing without the use of additional fasteners.

Abstract: A hybrid drive unit includes a main body case having a connection portion connected to an engine, the main body case accommodating therein a rotating electric machine; and an inverter case integrated with the main body case, the inverter case accommodating therein an inverter that controls the rotating electric machine, wherein an inverter breather is disposed in a side wall portion of the inverter case on a side of the connection portion so as to provide communication between an inside and an outside of the inverter case.

Abstract: A BLDC electric motor assembly (24) includes a rotor (42) having a plurality of magnet segments (50) securely retained thereabout by an annular ring (68) which is shrunk in situ in an electromagnetic forming operation. The magnet segments (50) are formed with tongues (62, 64) on their upper and lower ends (56, 58). One tongue (64) seats in a retaining pocket (48) molded on the rotor shaft (40), whereas the other tongue (62) provides a ledge into which the ring (68) seats. After the magnet forming operation, wherein the ring (68) is shrunk, the outer surface of the ring (68) is flush with the outer surfaces (54) of the magnet segments (50).

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 brushless rotary actuator comprises a housing including a motor housing defining a cavity for a motor assembly and a cover defining a cavity for a gear assembly. The motor assembly includes a rotor and a stator with a plurality of bobbins. A clip in the form of a ring plate is seated against the bobbins for retaining the bobbins on the stator. Fingers formed on the ring plate are fitted into respective slots defined by respective bobbin terminals. A circuit board is seated in the housing against an interior shoulder of the motor housing. A plate is seated in the housing against a peripheral rim of the motor housing in a spaced relationship above the circuit board.

Abstract: A first part formed of a first material is positioned to a second part formed of a second material, which is different from the first material in degree of modification due to environmental variation, by contacting surfaces of the first and second parts. At least three projections are formed on the contact surface of the first part along a circle whose center is coincident with a reference point. Grooves are formed on the contact surface of the second part so that the respective projections are fitted therein and that have wall surfaces to which the projections can contact at the inner and outer sides of the projections. The width of the grooves is determined so that the projections contact the inner or outer wall surface of the grooves even when the first and second parts deform in different degrees due to environmental variation.

Abstract: The invention relates to a device (10) for accommodating an electric motor (30), particularly a blower motor for a heating or air-conditioning system, comprising an essentially pot-shaped accommodating housing (12) serving as a motor housing and having an accommodating opening (32) in which the pole casing (46) of an electric motor (30) can be inserted while at least partially projecting inside. The inventive device also comprises a retaining flange (14) mounted on the accommodating housing (12) and serving to fasten the motor housing (12) to a supporting element, and comprises a control and regulating unit (20) mounted on the retaining flange (14) and serving to operate the electric motor (30). The invention provides that the accommodating housing (12) has, in the peripheral direction, at least one flattened area (36,40), which differs from a circular shape while corresponds with at least one flattening (54) of an outer contour of the control and regulating unit (20).

Abstract: An automotive alternator mounted on a vehicle for generating electric power includes front and rear frames, a cylindrical stator and a rotor. The cylindrical stator is contained in the frames, and the rotor is rotatably supported in the cylindrical stator. A rectifier device for rectifying alternating current generated in the stator into direct current is mounted on a rear surface of the rear frame and covered with a rear cover. To sufficiently cool minus rectifier elements positioned at a place not easily cooled only by the outside cooling air introduced into the alternator, a base portion of the minus rectifier element is contacted to the rear frame thereby to establish heat conduction therebetween. A resilient heat-conductive member is disposed between the base plate and the rear frame to absorb any dimensional discrepancies therebetween.

Abstract: An electric motor for actuators in a motor vehicle has an armature shaft, which is supported in a pole housing that includes a jacket and a bearing cover on at least on one end face for accommodating a bearing for the armature shaft, and at least one radial recess is formed in the pole housing, which, once the pole housing has been fully assembled, is suitable for engagement by at least one radial fastening segment of a transmission interface in the pole housing, in order to attach the electric motor to the transmission interface.

Abstract: A cooling module 67 includes a motor assembly 42 having a motor case 24 having at least one open end and including mounting brackets 30 integral therewith. Each bracket has only a bottom portion 32 connected with the motor case. An armature assembly is disposed in the motor case and includes a rotatable shaft 46. A brush card assembly 56 is associated with the armature assembly, and an end cap 60 is disposed over the brush card assembly and partially covers the open end of the motor case and thereby defining a non end cap covered motor portion 63. A fan 64 is coupled to an end of the shaft and has a hub substantially covering one end of the motor assembly. A shroud 74 has a motor cover 76. Fastening structure 78 is associated with the shroud and engaged with the brackets thereby mounting the motor assembly to the shroud, with the motor cover substantially covering the end cap and the non end cap covered motor portion.

Abstract: A motor includes a stator core that forms a magnetic path and has a plurality of tooth parts along a circumferential direction; a tooth provided in each tooth part to wind a coil there around; and an extension part alternated with the tooth part along a circumferential direction of the stator core, convexly extending to an inner radial direction.

Abstract: A case lid assembly is formed by integrally fitting a brush holder formed of resin and a terminal holder formed of resin to opposite sides of a metal plate which supports a bearing. The brush holder supports a pair of brush bases. The terminal holder supports a PTC element and a pair of electrically conductive members. The electrically conductive members have receptacle terminals and brush base connection portions. Tip ends of the brush bases pass through the metal plate, and come into contact with the brush base connection portions of the electrically conductive members to thereby be electrically connected thereto. The PTC element is accommodated within a PTC element insertion portion of the brush holder which extends through the metal plate in a thrust direction.

Abstract: A magnet wheel and a stator winding which are necessary for an excitation device are included in a synchronous machine. Energy is transferred to the magnet wheel through inductivity, preferably, energy to a super-conductive coil, by the excitation device. Protection against the magnetic field produced by the current in the winding head is provided in the form of a specific system which is used to reduce the corruptions of the interfering fields of stator and rotor winding.