Abstract: A plane commutator is comprised of a plurality of commutator segments, a plurality of base plate and a resinous boss member. The commutators are made of sintered carbon compound and disposed to provide a plane commutator surface at an end thereof and a base portion at the other end. Each commutator segment has a projection extending from the base portion. The resinous boss member is disposed in contact with the base portion. Each base plate has an engagement hole, to which one of the projections is fitted, and a terminal portion that extends along an outer periphery of the boss member. A powder-accommodation pocket is formed around a foot of each the projection so that the projection can be shaved by a corner edge of the hole. This ensures good contact of the commutators with the metal base plates and provides a sufficient manufacturing tolerance.

Abstract: A method of manufacturing a commutator includes the steps of punching a commutator forming plate out of a plate member having a plurality of projections formed at predetermined intervals in such a way that the projections extend in parallel to one another, forming the commutator forming plate cylindrical and arranging the projections on an inner surface of the cylindrical commutator forming plate, filling an interior of the cylindrical commutator forming plate with a molten resin, segmenting the cylindrical commutator forming plate at predetermined angular distances after curing of the resin to thereby form commutator pieces, and positioning the plate member in a mold. The step of punching the commutator forming plate is carried out using a first punch having a plurality of recesses corresponding to the projections. Formed at those portions of each recess which correspond to both corner portions of each projection narrow portions that become narrower in a depth direction of that recess.

Abstract: A DC brush motor includes an armature fixed to a shaft for unitary rotation with the shaft. The shaft is rotatably supported with respect to a case by way of a pair of bearings. The armature is made up of a core, a coil winding, and a resin-made supporting member for supporting the core with the core 9 rotating together with the shaft. The supporting member has a concave or recessed portion for receiving a boss of the case. Several commutator segments forming a commutator are arranged along the inner periphery of the recessed portion. A brush is held in a brush holder and is biased outwardly by the biasing force of a coil spring to contact a brush contact portion of the brush.

Abstract: A surface of a commutator 5 is rubbed by a shakedown brush 21 other than ordinary brushes 11 to produce a carbon coat, whereby a shakedown process can be reduced or abolished.

Abstract: The invention concerns a commutator device (1) for electric motor, comprising a housing part (2) and commutator brushes (3) housed in the housing part, each brush comprising a contact surface (8) designed to be pressed in contact against a commutator of the rotor of the electric motor, and a spring part (9) connected to the contact part (7) so as to exert a force on said contact part towards the rotor commutator. The device further comprises a damping element (14) arranged to absorb the vibrations or movements of the contact part of the brushes. The damping element (14) is a thixotropic lubricant.

Abstract: A rotary electric machine includes a stacked brush, where low-resistance and high-resistance brush layers are disposed at the front and rear end sides in the rotational direction of a commutator, respectively. When the insulation gap between the neighboring segments of a commutator is “a” and the width of the high-resistance brush layer is “b”, “a” and “b” are determined to satisfy a<b and b/a<4 to reduce sparks and improve commutation property. In order to reduce spark generation at the brush front end, especially, when the circumferential width of the segment is “c” and the width of the low-resistance brush layer is “d”, “a” to “d” are determined to satisfy b+d>2×a+c, d>b, a<b and d<a+c.

Abstract: A plane commutator includes a plurality of commutator segments made of carbon compound, a resinous boss member having a body portion supporting a base portion of the commutator segments and an outer peripheral portion supporting an outer periphery of the same and a plurality of metal base plates. Each metal base plate has a contact portion in contact with the base portion of the commutator segment, an axial portion extending along a peripheral portion of the boss member and a terminal portion. The axial portion of the metal base plates is disposed on an outer periphery of the plane commutator in parallel with the outer peripheral portions of the boss member to separate the outer peripheral portion from the body portion. The outer peripheral portion moves freely from the body portion as the metal base plates thermally expand.

Abstract: A disc-type commutator is mounted on a rear end surface of an armature of an electrical rotating machine. Plural commutator segments are radially arranged around a rotating shaft, separated from one another by radially extending commutator gaps. A width of the commutator gap is gradually widened along a radial direction of the commutator, so that foreign particles, such as swarfs or brush dusts, entered in the commutator gap are removed by a centrifugal force generated in rotation of the armature. Further, the width of the commutator gap may be gradually widened along its depth direction so that the width becomes wider at its open end that at its closed end.

Abstract: In a hook commutator of the prior art, a soldered connection (15), which connects a carbon segment (13) to a lamination (11) can become detached, since in the hot staking process for securing the winding wire, heat is produced.

Abstract: The invention provides a commutator motor capable of reducing vibration and noise generated in commutator motor and improving durability against breakage of armature. A commutator 3 having a conductive section 32 mounted on a rotary shaft 1 through an insulating section 31 is provided with a vibration-isolating member 33 made of rubber by adhesion or integral formation at the location between the conductive section 32 and the rotary shaft 1, for example, between the insulating section 31 and the rotary shaft 1 or between the conductive section 32 and the insulating section 31. In one aspect of the invention, another vibration-isolating member supports a brush holder 4 for holding a brush 41 coming in contact with the commutator 3.

Abstract: A rotor for a small-sized motor has a plurality of rotor magnetic poles and a commutator on a rotor shaft, and both ends of a wire of each winding of the rotor magnetic poles are tied up with and connected by spot welding to a U-shaped hook-type commutator leg connected to the corresponding commutator piece end of the commutator, respectively. The commutator leg has a copper-based base material, and is composed by attaching a thin layer of a clad material with a melting point lower than that of the above described base material and a high electric resistance thereon at the surface part to be inside when bent to the U-shaped hook type. Thus, in the connection between the commutator leg and the copper wire material of the small-sized motor, the reduction of defectives of breaking of the wire because of heat shock at the time of welding is achieved, and in the meantime, the stabilization of welding is achieved, so that the reliability of the connection can be increased.

Abstract: A method for making a commutator comprising steps of arranging at least one pair of commutator members to be spaced apart from each other, and molding a product by injecting an insulating resin; shaping the product to the product having a real circular sectional cross section; heating the product to a predetermined temperature; cutting protruding resin portions between the commutator members, to the align outer circumference of the commutator body with the outer surfaces of the commutator members. The predetermined temperature is that which rises when the commutator is rotated, and accordingly the predetermined temperature ranges from sixty to eighty degrees Centigrade (60° C.-80° C.). The finished commutator has grooves on the commutator body between the commutator members. The grooves undergo thermal expansion when the commutator is rotated and the temperature rises to a predetermined degree, so that the commutator has a real circular sectional cross section.

Abstract: A sulfidation-resistant current-carrying member, such as a commutator, suitable for a direct-current motor in a fuel pump is provided. The current-carrying member for a direct-current motor in a fuel pump includes a commutator composed of a carbon layer having carbon as a principal component and forming a sliding surface at one end, and a metal carbon layer fixedly bound with the carbon layer at the other end and comprising 55 to 90 wt % of metal having brass as a principal component and a remaining portion having carbon as a principal component. By using brass as a primary metal component in the metal carbon layer, it is possible to achieve a commutator with superior resistance to sulfidation.

Abstract: In a commutator forming plate to be rounded into a cylinder which is to be cut at constant angular intervals to form a plurality of commutator segments after being filled with insulating material, a plurality of lands rising at given intervals on one surface of a plate is provided and a plurality of projecting portions protruding nearly perpendicular to a rising direction of each of the lands are formed simultaneously by forming a plurality of grooves crossing with each other on the respective lands and extending so as to intersect obliquely with respective outer peripheries of the lands.

Abstract: A direct current motor, an apparatus including the direct current motor, and method of assembling the direct current motor with the motor including a stator; a rotor with a rotation shaft and rotor coils, a commutator integrally provided with the stator and connected to the rotor coils, a pair of electrode brushes in sliding contact with the commutator and configured to supply electric power from the commutator to the rotor coils to change a state of a direct current drive voltage to the rotor coils, and at least one rotation detecting brush arranged in a direction along an axis of the rotation shaft and in sliding contact with the commutator at a position different from a contact position of at least one of the pair of electrode brushes such that the rotation detecting brush detects a signal on the commutator indicative of an operation of the direct current motor.

Abstract: A commutator portion or a brush of a motor is formed of electrically conductive resin. When making the commutator portion with electrically conductive resin, a commutator member is molded of non-electrically conductive resin and the commutator members are all integrally formed with the commutator support member. At this time, at least a portion of the outer periphery of the axle is formed simultaneously with an electrically conductive resin layer.

Abstract: An electrical machine, such as an electric motor, dynamo or alternator has a casing with cooling vents enabling cooling fluid to flow into and out of the casing when the rotor of the electrical machine rotates. The rotor may be formed from conductive elements connected together at their outer regions by interconnecting members, which have vanes arranged to direct cooling fluid over the outer regions. Each conductive element is a metal strip with legs bent in opposite directions relative to the plane of the strip. Portions of the windings of the rotor are spaced apart to allow fluid to flow between the windings to enhance the cooling effect. With a current carrying rotor, the magnetic field intensity across the rotor is varied by varying the axial separation of the rotor and the stator.

Abstract: A cylindrical commutator is manufactured as follows. On the internal peripheral surface of a cylinder of base material having a plurality of hooks at one end, cuts are formed in a circumferential direction corresponding to the respective hooks, and projections are formed toward the inside by cutting. The base material is set to a molding die, and the prepared projections are embedded into the mold resin. Slits are processed at equal intervals in a circumferential direction on the external peripheral surface of the mold resin, and the hook and the prepared projection are divided for each segment. The segments are firmly integrated together with the mold resin.

Abstract: A motor device comprises a motor unit and a reduction unit. The motor unit comprises a yoke which is formed in a generally bottomed cylindrical shape, and a rotor having an armature and a rotary shaft. The reduction unit comprises a gear housing accommodating a reduction gear device for producing an output after reducing rotational speed of the rotor and fixed to the opening of the yoke. A commutator and brushes for the motor unit are disposed in the gear housing which is provided outside the opening of the yoke in the axial direction of the rotary shaft. The gear housing has a flange formed in a square shape, and the brushes are arranged along the diagonal lines of the square shape.

Abstract: A commutator having even number (2n) of commutator segments and n segment pairs, each pair consisting of two commutator segments positioned symmetrically with respect to a commutator center, is mounted on a rotor of an electric rotary machine. The commutator segments are electrically insulated from one another, while the commutator segments in each pair are electrically connected to each other. A metallic base plate and a carbon segment plate are molded together with resin, and then the commutator segments are separated into individual segments. Connecting portions for electrically connecting the commutator segments in each pair are formed integrally with the metallic base plate at positions depressed from a surface of the metallic base plate, so that the connecting portions are not cut in the process of separating the segment plate into individual commutator segments.

Abstract: A method is disclosed for manufacturing a commutator adapted to be mounted on a shaft of an electric motor for cooperation with electrical contacts of the motor, wherein a support member is molded from an electrically insulating material, the support member having a major outer surface portion divided into subsections of lesser area by a plurality of rib members extending upwardly from the outer surface portion. A sheet of electrically conductive material with minimum waste, is cut into commutator segments of predetermined shape and dimensions preferably by a stamping process for attachment to the outer surface portions of the subsections. The commutator segments are then adhesively attached to the outer surface portions of the subsections such that the segments form commutator surfaces interrupted by the rib members, with the upper surface of each segment being slightly higher than the upper surface of each of the adjacent rib members.

Abstract: A planar carbon segment commutator comprises a commutator base 10 of insulating material. The base has a rotational axis and front and rear surfaces, extending, at least in part, transversely to the rotational axis. A plurality of apertures 16 extend through the base. The commutator also comprises a plurality of commutator terminals 20 each of which comprises a terminal portion 21 and a contact portion 22. The contact portion 22 of each terminal extends through a respective aperture 16 and is bent to lie against or in close proximity to the front surface of the base 10. The terminal portion of each terminal has two cutting edges for cutting insulation on a connector portion of a winding and a slot which in use straddles and grips the connector portion. The commutator also comprises a plurality of carbon segments 30 formed on the front surface of the base and over the contact portions 22, respectively, of the terminals 20 and a housing (FIG.

Abstract: A vehicle blower motor includes a housing having a first bushing mounted at a first end about a shaft extending through the housing. A one-piece brush card bushing holder is mounted in the second end of the housing and carries a plurality of brushes engagable with a commutator mounted on the shaft. A second bushing is mounted in the brush card holder and disposed in engagement with the shaft. A portion of the brush card holder is formed as an end plate covering the second end of the housing.

Abstract: In one embodiment of the present invention, an electric motor is provided. A component of the electric motor, the commutator assembly, has a commutator and a brush assembly. The brush assembly encloses conductive brushes that are in contact with the commutator. A shaft is rotatably mounted about an axis, and a bearing is disposed around the shaft. The commutator is connected to the shaft, and a first seal surrounds the commutator. The first seal substantially isolates the commutator assembly from the internal ambient atmosphere of the electric motor. Further, a second seal substantially isolates the shaft and the bearing from the commutator and the conductive brushes.

Abstract: A control valve assembly for the rotary or linear actuation of control valves using contactless technology and the use of direct integration of electronic componentry into a lead frame interconnection assembly includes a contactless motor, a control valve in mechanical communication with the contactless motor through a gear system, and a lead frame interconnection assembly having electronic componentry relevant to the contactless motor and the control valve integrally formed therein. The contactless motor includes a commutator magnet disposed on a rotor shaft thereof. The commutator magnet is in magnetic communication with at least two commutator chips integrally formed with the lead frame interconnection assembly. The control valve includes a throttle element disposed in a throttle bore, an output shaft depending from the throttle element, and at least one position sensing magnet disposed on an end of the output shaft distal from the throttle element.

Abstract: A DC commutator motor that is driven by a direct current power source obtained by rectifying an alternating current power source includes a plus-side brush made of material having a high resistivity and a minus-side brush made of material having a low resistivity. A capacitor is inserted in and connected parallel to the direct current power source. The commutator motor makes use of specials tubes having different shapes to avoid an incorrect insertion of one of the specials tubes into the insertion hole designed to receive the other of the specials tubes.

Abstract: In an electric throttle-control apparatus for controlling an open position of a throttle valve 6 connected to reduction gears 47 to reduce rotational speed of the motor 4, by driving a motor 4 which includes a commutator 32 with a plurality of slots 44, and brushes 31 and 31′, the number of the slots in the commutator and the arrangement of brushes on the slots are set such that even and odd number slot states appear alternately in an electrical equivalent-circuit of a wire-connection among slots including the brushes while the motor rotates. Further, if the number of the slots 44 is the odd number 9, 11, or 13, the brushes 31 and 31′ are arranged in a 180° opposed placement, and if the number of the slots 44 is the even number 10 or 12, the brushes 31 and 31′ are arranged in a non-opposed placement shifted from a 180° opposed placement.

Abstract: A dynamo-electric machine includes a commutator secured around a rotatable shaft and a plurality of carbon brushes placed in sliding contact with the commutator. The commutator has a sliding contact surface placed in sliding contact with the carbon brushes. The sliding contact surface of the commutator has a plurality of peaks and valleys that are substantially regularly and alternately arranged in both axial and circumferential directions of the commutator.

Abstract: A motor for an electric power steering assembly includes a yoke, a multipolar magnetic field portion composed of at least four poles secured to the inner wall of the yoke, a shaft disposed within the yoke so as to be able to rotate freely, an armature secured to the shaft having a winding constructed by winding wiring into an even number of slots formed on the outer circumferential surface of a core so as to extend in the axial direction thereof, a commutator comprising a plurality of segments secured to an end portion of the shaft; and a plurality of brushes contacting the surface of the commutator.

Abstract: A motor for an electric power steering assembly includes a yoke, a multi-polar magnetic field portion composed of at least four poles secured to the inner wall of the yoke, a shaft disposed within the yoke so as to be able to rotate freely, an armature secured to the shaft having a winding constructed by winding wiring into an even number of slots formed on the outer circumferential surface of a core so as to extend in the axial direction thereof, a commutator including a plurality of segments secured to an end portion of the shaft; and a plurality of brushes contacting the surface of the commutator.

Abstract: In a rotor having a printed wiring commutator member as a printed wiring board in which a shaft installation hole is installed at the center of a printed wiring board, at least six segment patterns separated by slits are formed around the shaft installation hole, and simultaneously, at least three conductive bodies connect every two other segment patterns, terminal connection patterns are arranged at the outer circumference of the printed wiring board, a printed wiring commutator member is formed, not by through hole plating, as a means for forming the at least three conductive bodies for connecting every two other segment patterns, a plurality of air-core armature coils are installed at the side opposite to the segment patterns, and terminals of the air-core armature coils are connected to the terminal connection patterns through notches arranged at the outer circumference.

Abstract: In a commutator of a rotary electric machine having a plurality of commutator segments and a cylindrical insulation body, each of the commutator segments has a pair of inner claws disposed at axially central portion of an inner surface of the commutator segment respectively extending radially and axially inward and a pair of wedge portions disposed axially outside and a circumferential side of the pair of inner claws.

Abstract: When winding an armature coil, start S of a winding is entwined around a riser R1, the wire is wound via a riser R4 around a salient pole P1 adjacent to the riser R4 and an opposed salient pole P2 to the salient pole P1 in order, and leads from a riser R3 through an opposed riser R6 to an adjacent salient pole P3 and an opposed salient pole P4. Next, the wire is passed to a riser R5 and is wound around an opposed riser R2, an adjacent salient pole P5, and a salient pole P6, then ends with the riser R4. A varistor 18 is inserted and three electrodes 19 are soldered to the corresponding risers R2, R4, and R6.

Abstract: A combination brush retainer/spring assembly for use in a DC motor includes a retaining ring and a conical spring connected together as a single unit. The retaining ring portion is designed to fit in a center hole of a brush holder to retain a plurality of spring-loaded brushes against their spring bias so that an armature shaft and commutator can pass through the center hole without obstruction. When the commutator passes through the center hole, it pushes the retaining ring free, allowing the brushes to spring back toward the center hole to contact the commutator. The spring portion of the assembly has an end that engages with a ball bearing on the armature shaft with enough force to ensure that the armature shaft and ball bearing rotate at the same angular velocity and without slippage.

Abstract: A direct current motor including a rotor having a rotation shaft and rotor coils, a stator configured to apply a magnetic field to the rotor via magnetic poles of the stator opposing magnetic poles of the rotor, an electrical parts mounting base board fixed on the rotation shaft such that the rotation shaft perpendicularly intersects the electrical parts mounting base board, and a commutator having a contact electrode part formed with a plane conductive layer pattern and connected to the rotor coils. The contact electrode part is formed on the electrical parts mounting base board. The direct current motor further includes a pair of electrode brushes in sliding contact with the contact electrode part of the commutator and configured to supply electric power to the rotor coils though the commutator.

Abstract: A motor for an electric power steering assembly comprises a yoke, a multi-polar magnetic field portion composed of at least four poles secured to the inner wall of the yoke, a shaft disposed within the yoke so as to be able to rotate freely, an armature secured to the shaft having a winding constructed by winding wiring into an even number of slots formed on the outer circumferential surface of a core so as to extend in the axial direction thereof, a commutator comprising a plurality of segments secured to an end portion of the shaft; and a plurality of brushes contacting the surface of the commutator.

Abstract: A motor is provided with a riser member having a base portion fixed to the surface of the commutator of a rotor, a first turned-back portion bent so as to hook the winding of the motor, and a second turned-back portion provided on the side opposite to the base portion with respect to the first turned-back portion. Thereby, a ring varistor can be supported by the second turned-back portion, and the mounting of the ring varistor can be effected easily.

Abstract: In a commutator of an armature of an electric motor, a plurality of segments are arranged on the outer peripheral surface of a commutator ring at equal angular intervals. The segments which are in the same phase and oppose with 180° angular interval are connected through a conductive plate. Each conductive plate is spaced apart a predetermined distance from adjacent ones in the axial direction not to short, and molded within the commutator ring. Each of brushes is shaped to have a width which is sufficient to bridge over three segments. Alternatively, the commutator ring may be shaped to have a tapering protrusion part (25c) and the same-phase segments may be directly connected by a shorting wire along the tapering protrusion part.

Abstract: When a commutator is slipped onto a rotor shaft that is provided with viscous epoxy, a bead of epoxy forms on the connecting end face of the commutator core and can hinder the process of winding the rotor. The novel commutator therefore has a receiving bore (25), which begins at the connecting end face (23) of the commutator and extends coaxially to the longitudinal axis (1) as far as a shoulder (26) and is adjoined by a conical bore (29) tapering toward a through bore (24). The bead (22) of epoxy that forms when the commutator is slipped onto the rotor shaft is completely covered by the receiving bore (25). The commutator is especially suitable for rotors of electrical machines.

Abstract: A plane commutator includes a plurality of commutator segments made of carbon compound, a resinous boss member having a body portion supporting a base portion of the commutator segments and an outer peripheral portion supporting an outer periphery of the same and a plurality of metal base plates. Each metal base plate has a contact portion in contact with the base portion of the commutator segment, an axial portion extending along a peripheral portion of the boss member and a terminal portion. The axial portion of the metal base plates is disposed on an outer periphery of the plane commutator in parallel with the outer peripheral portions of the boss member to separate the outer peripheral portion from the body portion. The outer peripheral portion moves freely from the body portion as the metal base plates thermally expand.

Abstract: A rotor for an electric motor includes a commutator and a rotor shaft with a rotor winding that is contained in a rotor body supported on the rotor shaft in a rotationally fixed manner. The commutator has commutator lamellas that are disposed axially next to one another in the circumference direction with an insulation gap and have connection lugs for attachment of connecting wires of the rotor winding. In a region between the commutator and the rotor body, an additional winding is wound around the connecting wires in order to fix or stabilize the connecting wires. The rotor is provided for electric motors used in vehicle construction.

Abstract: A commutator-integrated armature of a rotary electric machine is comprised of a rotary shaft, an armature core composed of a plurality of laminated sheets, an armature coil composed of a plurality of conductor segments. The conductor segments have in-slot portions respectively inserted into a plurality of slots of the armature core and end portions forming a flat commutator. The armature core has an anchoring portion for anchoring a part of each of the in-slot portions to the armature core more strongly than the rest thereof. The surface of the flat commutator is maintained flat even if the conductor segments repeat thermal expansion and contraction.

Abstract: Proposed is a commutation device for a direct-current motor, designed to improve the ripples in the signal course (40, 50) for the commutation current, so as to obtain reliably and error-free speed information with the aid of an electronic circuit. With the commutation device design according to the invention, the longitudinal edges of the collector bars (11, 21, 31) form an angle (&agr;) of more than zero degrees with the front longitudinal edge (18, 28, 38) of the contact face (16, 26, 36). On the one hand, this results in a reduction of the brush noise (airborne sound) and, on the other hand, in a lowering of the noise development (structure-born sound).

Abstract: A commutator comprises a plurality of commutator segments on the outer circumferential surface and is connected at one end to an armature. At the other end, the commutator has an annular noise-preventing electric element, such as varistor, which has a plurality of connecting electrodes, each of which is electrically connected to each of the commutator segments via a short-circuit conductor, thereby avoiding soldering connection.

Abstract: When winding an armature coil start S of a winding is entwined around a riser R1, the wire is wound via a riser R4 around a salient pole P1 adjacent to the riser R4 and an opposed salient pole P2 to the salient pole P1 in order and leads from a riser R3 through an opposed riser R6 to an adjacent salient pole P3 and an opposed salient pole P4. Next, it is passed to a riser R5 and is wound around an opposed riser R2, an adjacent salient pole P5, and a salient pole P6, then ends with the riser R4. A varistor 18 is inserted and three electrodes 19 are soldered to the corresponding risers R2, R4, and R6.

Abstract: A metallic ring 45 molded by punching a copper plate having hooks 43, etc., and a carbon member 46 are brazed to each other by a brazing material having a higher melting point than the temperature for connecting a coil to conductive members 52, that is, a brazing material containing, for example, nickel and chromium. Next, resin is filled up inside the metallic ring 45 and carbon member 46 to form a resin substrate 48. Next, slits 50 are formed at the metallic ring 45 and the carbon member 46 in the radial direction, so that generally fan-shaped segments 51 insulated from each other and conductive members 52 are formed. Next, a coil is connected to hooks 43 of the conductive members 52 by soldering, welding, etc.

Abstract: A power generating electromagnetic motor (2) which comprises a novel pulsed plasma commutator (22) in conjunction with a bipolar magnetic rotor (16) made of high BH.sub.max permanent magnets (14) affixed to a core element (18) disposed coaxially with drive coil (12) with an air gap there between and providing an adjacent receiving coil (10) for discrete, particle and wave recapture as well as by array (80). The commutator (22) propels the drive coil assembly (8) with a series of intermittent pulses as well as producing unique power outputs and discrete particles and waves in the resultant plasma, such as Electrum Validum or EV and furthermore is the unique presence of system negative entropy.

Abstract: In rotors for electric motors, it is usual to fix the commutator on the rotor shaft by means of a press fit. In the process, damage undesirably occurs to the surface of the rotor shaft.

Abstract: Disclosed is a carbon commutator, comprising a plurality of metal segments each having a through-hole, a plurality of carbon segments each having a projecting portion, which contains a metal, being inserted into the through-hole to be deformed so as to join the carbon segment to the metal segment, and a commutator body on which a plurality of the metal/carbon joined segments are arranged fixedly in a manner to form a substantially circular body.

Abstract: A self-excited reluctance motor capable of driving a motor with a commutator and without having to use a commutator logic for power electric circuit. The self-excited reluctance motor includes a stator having a plurality of stator poles respectively wound by wires of different phases; a rotator having a plurality of rotator poles formed on an outer circumference thereof, the rotator rotatably inserted in the stator; and a commutator.