Abstract: A through-bolt for use with an AC generator has a housing including a drive-end portion and a mounting-end portion. A stator is mountable between the drive-end portions. A rotor is mounted for rotation within the housing. One of the end portions includes a plurality of circumferentially spaced ears having first apertures therein and the other end portion includes a corresponding plurality of circumferentially spaced ears having threaded apertures therein. The through-bolt is inserted through one of the first apertures and received in one of the threaded apertures to bolt the housing ends together against the stator. The through-bolt is subject to bending stress since it does not operate on a solid stack up, regardless of alignment. The through-bolt comprises a head portion, an elongated shank portion, and a threaded portion extending from the elongated shank portion.

Abstract: An electric machine is proposed, in particular a generator for a motor vehicle, having an excitation system comprised of a number of electrically excited individual poles in the stator or rotor. The stator (40) or rotor (39) is embodied in the form of electromagnetically excited poles (37, 38) which are oriented axially along the circumference and whose polarity alternates in the circumferential direction, in which permanent magnets (43) are inserted into intermediary spaces (42) between the alternating poles (37, 38) in order to reduce the magnetic leakage flux.

Abstract: A rotor assembly for an electromechanical machine includes iron rotor pole pieces containing a plurality of finger claws each having an exterior face about the circumference of the rotor assembly. Indentations are produced on the surface of each exterior face so as to form a plurality of closed surface areas. The closed surface areas restrict the travel of and confine the eddy currents to small surface areas thereby reducing the efficiency losses due to eddy currents.

Abstract: A brush-less rotary electric machine is comprised of a frame having a first and second walls, a stator core fixed to the frame, an armature coil formed of conductor segments, a stationary yoke, a rotary yoke disposed opposite the stationary yoke, first claw pole members disposed opposite the stator core, second claw pole members disposed opposite the stationary yoke, and a field coil fixed to the stationary yoke. The armature coil has radial air passages formed among connection portions of the conductor segments, and the second claw pole members have a fan-shaped projection portion. When the claw pole members rotate, the projection portion supplies cooling air to the radial air passages to cool the second coil end.

Abstract: A motor-generator is disclosed, in which electromagnet coils are arranged at axially opposite ends of the stator, each to each end, while connections among winding sets are changed in response to the rpm of the rotor. This makes it possible to control the voltage, either at high speed or at low speed, thereby increasing the torque at low speed, or the torque on the rotor shaft at low speed and rendering the voltage stable. A rotor is comprised of a cylindrical magnetic path axially elongating to extent confronting the electromagnet coils, and a permanent-magnet member of more than one permanent-magnet piece extending axially over the magnetic path.

Abstract: A hybrid electrical machine generator having a permanent magnetic rotor field in addition to an electrically excited rotor field is disclosed. The generator rotor (120) has a wound field coil (124) mounted on the rotor shaft (122) between two opposing claw segments (126, 128). One or more permanent magnets (130) maybe provided about the periphery of the first and/or second claw segments.

Abstract: A rotary electric machine for being mounted on an internal combustion engine of a vehicle or the like. The rotary electric machine includes a rotation shaft rotatably supported by a bracket; a rotor fixed to the rotation shaft; a stator which has a stator core disposed opposite to the outer periphery of the rotor and a stator winding mounted onto the stator core, and which is supported by the bracket; and a pulley engaged with an end of the rotation shaft to rotate integrally with the rotation shaft. The pulley and the rotation shaft are mutually engaged to form an engagement portion. The engagement portion includes a regulation means for regulating-sliding movement between the rotation shaft and the pulley in their peripheral direction.

Abstract: An axial length of an iron core of a stator is set larger than an axial length of a cylindrical part on which a field coils are wound. An axial thickness of a yoke part is set larger than a radial thickness of a claw-like magnetic pole part. The cylindrical part is separate from the yoke part and fixed to the yoke part with the cylindrical part in contact with the yoke part. Thus, the contact surface of the cylindrical part and that of the yoke part serve as a thermal resistance, respectively, thereby preventing heat from being transmitted from the yoke part to the cylindrical part.

Abstract: The generator comprises a stator core 4 in which a three-phase stator coil 5 is wound and inserted into slots, a first rotor core 8 and a second rotor core 9 which are provided in the side of an inner diameter of this stator core 4 and rotate with a rotating shaft 7, a field coil 10 for magnetizing these first and second rotor cores 8 and 9 in different magnetic poles, and a plurality of magnetic poles 23 and 24 which are provided so as to extend to an axial direction of the rotating shaft 7 from the first and second rotor cores 8 and 9 and are arranged so as to have engagement alternately through predetermined gaps 25 and 26 between the magnetic poles and are opposite to the surface of the inner diameter of the stator core 4, and it is configured so that these magnetic poles 23 and 24 have a plurality of parts 23a, 24a and 23b, 24b in the axial direction and are stepwise formed and the respective parts are set to different widths in a rotational direction.

Abstract: A vehicular AC generator comprising a pair of cores included in a rotor and supported by a rotating shaft, a plurality of trapezoidal-shaped claws as magnetic poles protruding on the outer periphery edges of the pair of cores, and a pair of fans attached to the front side and the rear side of the cores, at least one of the fans having an outer diameter in the range between 85% and 96% of the outer diameter of each of the cores, each of the claws having a tapered portion for gradually decreasing the outer diameter of a shoulder portion of the claw in the direction toward the end surface of the core so that the outer diameter of at least one of the cores faced to the at least one of the fans becomes substantially the same as the outer diameter of the at least one of the fans, whereby the sound caused by cutting wind by the rotation of the centrifugal fans can be reduced without deteriorating the cooling efficiency of the coil ends of the stator.

Abstract: A vehicular AC generator comprising a pair of cores included in a rotor and supported by a rotating shaft, a plurality of trapezoidal-shaped claws as magnetic poles protruding on the outer periphery edges of the pair of cores, and a pair of fans attached to the front side and the rear side of the cores, at least one of the fans having an outer diameter in the range between 85% and 96% of the outer diameter of each of the cores, each of the claws having a tapered portion for gradually decreasing the outer diameter of a shoulder portion of the claw in the direction toward the end surface of the core so that the outer diameter of at least one of the cores faced to the at least one of the fans becomes substantially the same as the outer diameter of the at least one of the fans, whereby the sound caused by cutting wind by the rotation of the centrifugal fans can be reduced without deteriorating the cooling efficiency of the coil ends of the stator.

Abstract: In an alternating current generator and fans thereof in accordance with the invention, the cooling efficiency of the alternating current is improved by fans fixed to a rotor. When the fans are formed during a press working operation, the blades are formed directly from the fans by cut-raising the fans toward a bracket side to form blades and simultaneously cut-raising protruding potions toward a rotor side to form protrusions. This design allows for both improvement in cooling efficiency of the alternating current generator and ease of manufacture of the fans.

Abstract: A system and method for manufacturing a stator is shown. An automated stator press is used to assemble a stator. The automated stator press includes a support frame, a control system, a sensor, and a hydraulic ram. Stator laminations are stacked onto a mandrel. The mandrel is placed in the support frame. A stator housing is placed over the mandrel. The hydraulic ram compresses the stator laminations in the stator housing. The control system receives compression information from the sensor, and operates the hydraulic ram based on stored process information and information received from the sensor. A stop is inserted in the stator housing to hold the stator laminations in a state of compression after removal of the hydraulic ram.

Abstract: The present invention is a rotor for a vehicle a.c. generator which increases the operational life of the a.c. generator. The rotor, in the present invention for a vehicular a.c. generator includes a bobbin having a rotor coil for generating a magnetic field wound thereon and including fixing portions for supporting lead wires of the rotor coil; a pair of rotor cores for sandwiching the rotor coil and the bobbin therebetween; slip rings having terminals to be connected to the lead wires; grooves formed in the rotor core for housing the lead wires, the lead wires extending between the fixing portions and the terminals; and a rear fan provided so as to cover the grooves. The fixing portion, the terminal and the groove for each of the lead wires are provided so as to be substantially aligned, and the groove has an inward portion near an inner periphery of the rotor formed in a greater width than an outward portion near an outer periphery of the rotor.

Abstract: An automatic wheel-driven generating device mainly includes a base fixedly mounted on a wheel around an axle thereof and provided with a centered hollow column and one or more radially extended hollow pipes for each receiving a light-emitting element therein; a winding reel enclosed between left and right magnetic poles and fixedly mounted on the hollow column; and a magnet holder having a cap screwed into a center thereof and being fixedly mounted on the axle. The magnet holder carries magnets and is associated with the winding reel and the magnetic poles without contact with them. When the wheel rotates, the winding reel and the magnetic poles on the base rotate along with the wheel relative to the magnet holder that is unmovably fixed on the axle, so that an induced current is produced to drive the light-emitting elements to emit light beams.

Abstract: The vehicle alternator comprises a rotor (2) having interleaved polar horns (18), at least one of the horns having, facing towards another one of the horns, a side face (20) formed with a profiled groove (22). The groove has one longitudinal end (30) which is blind in a longitudinal direction of the groove.

Abstract: An alternator includes a rotor including claw-shaped magnetic poles fitted onto a rotating shaft, and a cooling means disposed on an end surface of the claw-shaped magnetic poles, and a stator including a stator core disposed facing the rotor, the stator core having a plurality of slots, and a stator winding installed in the stator core, the stator being cooled by the cooling means, and a bracket for supporting the rotor and the stator, a passage for an air flow generated by the cooling means being disposed inside the bracket, the stator winding including coil ends extending outwards from end surfaces of the stator core, and a shielding material being disposed so as to cover at least an inner circumferential surface of the coil ends.

Abstract: In a rotor for a vehicular alternating current generator, a field coil is wound around an insulating bobbin. A flange of the bobbin is formed with the first, second and third hook portions. A coil winding finishing end is wound around the first hook portion and is opposed to a winding direction of the field coil. The finishing end is then directed in a radially inward direction with the second hook portion, and extended further in the radially inward direction along the axial end surface of the flange. Then, the finishing end is directed in the axial direction with the third hook portion, radially inside of the outer peripheral end of the field coil. The finishing end forms an angle with itself of less than 90 degrees around the first hook portion when being viewed along an axial direction of the first hook portion.

Abstract: A rotor of a vehicle AC generator is comprised of a rotor core and a field coil. The rotor core is comprised of a boss portion and a plurality of claw-pole portions bending to respectively extend in axial directions from outer circumferences of the boss portion to interleave with each other to form a zigzag space between the claw-pole portions. The field coil comprises a main coil portion disposed on the boss portion, a sub-coil portion disposed between the main coil and the claw-pole portions and a flywheel diode connected in parallel with the main coil. When the field current is cut off, current circulating through the main coil is increased because the energy accumulated in the sub-coil is discharged.

Abstract: A chamfered portion 100 on three points, being a point B formed on a peripheral end surface of a root shoulder portion of magnetic pole pieces 8a or 9a and being on a line, from which a taper formed on an outer peripheral surface of the root shoulder portion starts, a point C on a skew slanted portion of the magnetic pole pieces 8a and 9a, and a point A on the peripheral end surface of the magnetic pole pieces 8a or 9a apart from an end surface of a stator core 4 by a distance between L1/4 and 7×L1/8, is formed in the magnetic pole piece of an a.c. generator for vehicle, whereby noises such as wind noise and electromagnetic sound can be reduced, a magnetic circuit of a rotor is improved, the amount of magnetic flux is increased, whereby an output becomes high.

Abstract: The alternator comprises a stator including an iron core having teeth extending radially inwardly and arranged in a circumferential direction and a rotor including two sets of claw-like magnetic poles formed in a circumferential direction and fixedly mounted on a shaft in a state where the two sets of claw-like magnetic poles engage with each other. In each of the claw-like magnetic poles, an inclined surface is formed in each of both circumferential-direction side portions laying on an outer-diameter side of its proximal section. In this construction, when a circumferential-direction central position between the adjacent claw-like magnetic poles is aligned with a circumferential-direction central position of the tip portion of the tooth in the case of being viewed from a radial direction, the tip portion does not overlap with the outermost-diameter surface of each of the adjacent claw-like magnetic poles, but it overlaps with at least a portion of the inclined surface.

Abstract: The invention concerns an electrical machine, in particular an alternator, having a stator situated in a housing and carrying a stator winding, and having a claw-pole rotor system that is supported on a shaft and has two pole rings designed as pole pieces that extend outward to form claws that mesh into each other, and having a field coil enclosed by the claw-pole rotor system, in particular situated on the shaft.

Abstract: An automotive alternator which can realize high output and efficiency, and in which noise may be reduced includes: a polyphase stator winding 16 comprising a number of winding portions in which long wire strands 30 are wound so as to alternately occupy an inner layer and an outer layer in a slot 15a depth direction within the slots 15a at intervals of a predetermined number of slots 15a, the wire strands 30 folding back outside the slots 15a at axial end surfaces of a stator core 15 to form turn portions 30a; the turn portions 30a of the wire strands 30 being roughly the same shape and aligning at roughly the same pitch in a circumferential direction to constitute coil end groups 16a, 16b; the coil end groups 16a, 16b being disposed in a plurality of rows in the radial direction; fans 5 being provided at axial end portions of a rotor 7 roughly facing the coil end groups 16a, 16b and generating cooling air D flowing in a radial direction to ventilate the coil end groups 16a, 16b.

Abstract: A rotor of an AC generator includes a field coil, a pole core having a plurality of claw poles disposed in the circumferential direction to enclose the field coil to provide a plurality of magnetic fields when the field coil is energized and a cylindrical permanent magnet disposed inside the plurality of claw poles to supplement the plurality of magnetic fields. The cylindrical permanent magnet is easy to orient magnetic character so that strong magnetic field can be provided at a low cost.

Abstract: A hybrid electrical machine having a permanent magnetic rotor field in addition to an electrically excited rotor field is disclosed. The generator rotor (220) has two opposing claw segments (226, 228) mounted at opposite ends of a rotor shaft (222). A third, center claw segment (232) is mounted on the rotor shaft between the first and second claw segments. A first wound field coil (224) is mounted on the rotor shaft between the first and third claw segments, and a second wound field coil (234) is mounted between the second and third claw segments. One or more permanent magnets (230, 231) may be provided about the periphery of the first, second, and/or third claw segments.

Abstract: The present invention is to obtain a vehicle alternator capable of effectively reducing an electromagnetic noise. The vehicle alternator includes steel sheet fans mounted to poles by being welding to the end surfaces of the poles on the inner peripheral sides of the fans at a plurality of positions in a peripheral direction and a bobbin around which a coil is wound and which is attached in the poles and further includes elastic matters interposed between the fans and the poles on the outer peripheral side of the welding portions where the fans are welded to the poles.

Abstract: The invention concerns a rotating electric machine which includes a stator equipped with armature coils and a rotor mounted rotating inside the stator. The rotor having a series of magnets with alternating polarities juxtaposed with magnetic parts having magnetic resistance, respectively associated with the magnets. Each assembly of one magnet and one associated magnetic part defining a rotor pole wherein some of the poles have alternately, along a generally tangential direction, a magnet followed by its magnetic part and a magnet preceded by its magnetic part. The invention is applicable to motor vehicle alternators and AC starters.

Abstract: In an automotive alternator having a case in which air intake vents 1a and air discharge vents 1b are disposed, a rotor, which is fastened to a shaft such that claw-shaped magnetic poles intermesh, has as a pair of fans having a plurality of blades and fastened to the axial end surfaces of poles cores, and is rotatably disposed in the case, a stator core to which a plurality of slots are formed and a stator having a stator winding to be accommodated in the slots, the slots are formed in an even number, each of the claw-shaped magnetic poles is formed in an even number, and said blades of the pair of fans are formed in the same odd number, respectively. With this construction, there can be provided a small automotive alternator which has a high output and an excellent cost performance and in which fans generate a low level of noise.

Abstract: A vehicular alternator is provided which can effectively utilize the magnetic flux of a permanent magnet disposed between claw-type magnetic poles and can improve an output of the alternator. The vehicular alternator comprises a rotor and a stator constituted by coiling stator windings over a stator core, the rotor comprising a pair of claw-type magnetic poles arranged in an opposed relation, a permanent magnet disposed between adjacent two of a plurality of claws provided on the pair of claw-type magnetic poles, and field windings coiled radially inward of the plurality of claws. Each of the plurality of claws of the rotor is formed to have a shape coming into contact with the whole of a magnetic pole surface of the permanent magnet.

Abstract: In order to provide a small sized, high speed rotation and high output vehicle use AC generation system, a vehicle use AC generator and a vehicle use AC generator use drive force transmission system which enhances output in a broad range from a low speed to a high speed, in a vehicle use AC generation system including a vehicle use AC generator coupled to a crank pulley shaft of an engine via a pulley, the vehicle use AC generator being provided with a rotor having magnetic poles and a field winding for magnetizing the magnetic poles, a stator which is disposed being spaced apart with a predetermined gap with respect to the rotor and has a stator winding for generating an AC voltage through magnetization of the magnetic poles, a first shaft to which the pulley is provided and a second shaft integral with the rotor, wherein the first shaft is disposed within the side face of the vehicle use AC generator and at a equivalent position with respect to the second shaft when seen from the crank pulley shaft or rathe

Abstract: A hybrid electrical machine having a permanent magnetic rotor field in addition to an electrically excited rotor field is disclosed. The generator rotor (320) has a first claw segment (326) and a second claw segment (328) mounted at opposite ends of a rotor shaft (322). A third, center claw segment (332) is mounted on the rotor shaft, between the first and second claw segments. A wound field coil (324) is mounted on the rotor shaft (322) between the first and third claw segments, and a permanent, axial flux magnet (336) is mounted on the rotor shaft between the second claw segment and the third claw segment. In some embodiments, one or more permanent magnets may be provided about the periphery of the first, second, and/or third claw segments.

Abstract: A brushless AC generator includes a stator having a an armature coil, a rotor, a frame for supporting the stator and the rotor, a pulley driven by a belt, a pulley-side bearing and anti-pulley-side bearing. The rotor is comprised of a magnetic pole core having a plurality of alternately polarized magnetic pole pieces, a rotary yoke integrated with a group of the magnetic pole pieces polarized in one polarity and fixed to the rotary shaft. The stator is comprised of a stationary yoke interposed between the other group of the pole pieces polarized in the other polarity and the rotary yoke and a field coil. The anti-pulley-side bearing has a higher magnetic permeability than the pulley-side bearing. The above feature can reduce magnetic reluctance of the AC generator without lowering the reliability of the AC generator.

Abstract: An automotive alternator reduces invalid magnetic fluxes and uncomfortable noises. In the automotive alternator, the number of slots is one per set of stator coils, per phase, and per pole. The stator coils are disposed such that two sets of three-phase coils have a phase difference from each other, and center-to-center intervals of circumferential gaps of adjoining slot openings are set to be nonuniform. Claw-shaped magnetic poles of the rotor are formed such that at least a narrow tooth of teeth formed between the slots of the opposing stator is positioned to overlap two of the claw-shaped magnetic poles that are adjacent in a direction of rotation of the rotor and have opposite polarities.

Abstract: The vehicle AC generator comprises a stator core 4 having a stator coil 5, a first rotor core 8 and a second rotor core 9 provided on an inner diameter side of the stator core 4 to rotate, a field coil 10 for magnetizing the first rotor core 8 and the second rotor core 9, and a plurality of pole pieces 8a, 9a provided on the first rotor core 8 and the second rotor core 9 to extend in an axis direction of the rotation axis, and arranged to engage alternatively with each other via a predetermined clearance, and provided to oppose to an inner diameter surface of the stator core 4 via a predetermined clearance, wherein the poles pieces 8a, 9a are formed into an almost trapezoidal shape to reduce a width toward its tip portion in a rotation direction, and a skew angle against the axis direction of both side surfaces of the pole pieces in a rotation direction is set small on a root side and also set large on a tip side.

Abstract: A vehicular AC generator comprising a pair of cores included in a rotor and supported by a rotating shaft, a plurality of trapezoidal-shaped claws as magnetic poles protruding on the outer periphery edges of the pair of cores, and a pair of fans attached to the front side and the rear side of the cores, at least one of the fans having an outer diameter in the range between 85% and 96% of the outer diameter of each of the cores, each of the claws having a tapered portion for gradually decreasing the outer diameter of a shoulder portion of the claw in the direction toward the end surface of the core so that the outer diameter of at least one of the cores faced to the at least one of the fans becomes substantially the same as the outer diameter of the at least one of the fans, whereby the sound caused by cutting wind by the rotation of the centrifugal fans can be reduced without deteriorating the cooling efficiency of the coil ends of the stator.

Abstract: A generally annular magnet retainer is provided for use in a rotor of a rotating electrical machine. The retainer includes a generally annular ring that is configured to be assembled between first and second claw poles, and further includes a plurailty of pockets extending therefrom defining a plurality of cavities that are configured to receive a corresponding plurality of magnets therein.

Abstract: The generator comprises a stator core 4 in which a three-phase stator coil 5 is wound and inserted into slots, a first rotor core 8 and a second rotor core 9 which are provided in the side of an inner diameter of this stator core 4 and rotate with a rotating shaft 7, a field coil 10 for magnetizing these first and second rotor cores 8 and 9 in different magnetic poles, and a plurality of magnetic poles 23 and 24 which are provided so as to extend to an axial direction of the rotating shaft 7 from the first and second rotor cores 8 and 9 and are arranged so as to have engagement alternately through predetermined gaps 25 and 26 between the magnetic poles and are opposite to the surface of the inner diameter of the stator core 4, and it is configured so that these magnetic poles 23 and 24 have a plurality of parts 23a 24a and 23b, 24b in the axial direction and are stepwise formed and the respective parts are set to different widths in a rotational direction.

Abstract: A vehicular AC generator comprising a pair of cores included in a rotor and supported by a rotating shaft, a plurality of trapezoidal-shaped claws as magnetic poles protruding on the outer periphery edges of the pair of cores, and a pair of fans attached to the front side and the rear side of the cores, at least one of the fans having an outer diameter in the range between 85% and 96% of the outer diameter of each of the cores, each of the claws having a tapered portion for gradually decreasing the outer diameter of a shoulder portion of the claw in the direction toward the end surface of the core so that the outer diameter of at least one of the cores faced to the at least one of the fans becomes substantially the same as the outer diameter of the at least one of the fans, whereby the sound caused by cutting wind by the rotation of the centrifugal fans can be reduced without deteriorating the cooling efficiency of the coil ends of the stator.

Abstract: The vehicle alternator comprises a rotor having interleaved pole pieces, permanent magnets disposed between the pole pieces, and at least one magnet-support strip which extends over a circumferential outside face of the pole pieces.

Abstract: Front-end and rear-end coil ends constituting front-end and rear-end coil end groups are formed into a connection pattern composed of pairs of root portions extending outwards from pairs of slots 15a three slots apart, pairs of inclined portions bent from each of the pairs of root portions and extending in a circumferential direction, and pairs of joining portions connecting together end portions of the pairs of inclined portions. Inclined portions positioned on an inner circumferential side of the coil ends are inclined forwards relative to a rotational direction of fans.

Abstract: An automotive alternator is capable of reducing electromagnetic noises and wind noises of 12f components, which are extremely unpleasant higher harmonic noises to the ears, thereby permitting uncomfortable noises to be reduced, and also capable of suppressing a drop in output caused by a phase difference. In the alternator, two slots are applied per pole in a phase, spaces between centerlines that extend in a radial direction of openings of adjoining slots are formed to be irregular, and a first three-phase stator winding and a second three-phase stator winding are wound around a stator core with a phase difference of an electrical angle ranging from 31 to 34 degrees.

Abstract: The generator comprises a stator core 4 in which a three-phase stator coil 5 is wound and inserted into slots, a first rotor core 8 and a second rotor core 9 which are provided in the side of an inner diameter of this stator core 4 and rotate with a rotating shaft 7, a field coil 10 for magnetizing these first and second rotor cores 8 and 9 in different magnetic poles, and a plurality of magnetic poles 23 and 24 which are provided so as to extend to an axial direction of the rotating shaft 7 from the first and second rotor cores 8 and 9 and are arranged so as to have engagement alternately through predetermined gaps 25 and 26 between the magnetic poles and are opposite to the surface of the inner diameter of the stator core 4, and it is configured so that these magnetic poles 23 and 24 have a plurality of parts 23a, 24a and 23b, 24b in the axial direction and are stepwise formed and the respective parts are set to different widths in a rotational direction.

Abstract: The alternator for a vehicle includes two magnet wheels (6) comprising poles (10) in the form of interlaced claws and at least one magnet (20) interposed between the poles. Each magnet (20) comprises two parts fixed to one another by a layer (26) of material which is more flexible than the magnet.

Abstract: In an electrical machine, in particular a three-phase generator, with a stator (10) fastened in a housing and with a claw pole rotor system, mounted on a shaft (2), with a first pole ring (4), configured as a magnet wheel half and tapering into claws (41), and a second pole ring (3), mechanically joined to the first pole ring (4) by a nonmagnetic joining means and tapering into claws (31), as a magnet wheel half, the respective tips of the claws (31,41) of the one pole ring (3,4) extending into the interstices between the claws (41,31) of the other pole ring (4,3), and with an exciter winding (25) associated with the pole rings (3,4) on the shaft side, in the interest of a strong, easily accessible welded join between the pole rings (3,4) the nonmagnetic joining means is a nonmagnetic plate (5) which adjoins the surface (42) of the first pole ring (4) facing away from the claws (41) of the first pole ring (4), and is joined to that surface and to the tips of the claws (31) of the second pole ring (3).

Abstract: A rotary electrical machine, comprising a stator (100) having at least one armature winding (140) mounted in slots which define stator poles, and a rotor (200) mounted for rotation inside the stator, the rotor having at its outer periphery magnetic poles comprising, firstly, North-South magnets (210N-210S), and secondly, magnetic reluctance pieces (215-215′), wherein the North-South magnets of two consecutive n, n+1 poles are grouped side by side, and in that the magnetic reluctance pieces of two consecutive n+1, n+2 poles are also side by side.

Abstract: A brushless-type alternator has a rotor, which comprises a pair of pole cores. The pole cores include a plurality of nail parts, respectively. The nail parts are arranged alternately in a rotating direction of the rotor. The nail parts are coupled to-each other with a non-magnetic ring. A permanent magnet is interposed between adjacent two of the nail parts, and fixedly held in position with the non-magnetic ring. The permanent magnets are located radially inside or outside the non-magnetic ring.

Abstract: A bobbin unit for a brushless alternator field coil, which can reduce the diameter of a bobbin, need not wind a tape and can be made easily, has a ring-shaped iron core having a thick wall; a plate having a hole whose inside diameter is as large as that of the iron core and which is composed of a thin wall cylindrical portion having an end which is abutted against and connected by an abutting/connecting operation to an end surface of the iron core with the axial center of the cylindrical portion being in coincidence with that of the iron core, and a flange portion formed at the opposite side of the cylindrical portion and extending outwardly in a radial direction; and a resinous bobbin interposed between the iron core and the plate for insulating and accommodating a field coil.

Abstract: In an automotive alternator including a rotor having first and second claw-shaped magnetic poles fitted onto a rotating shaft, and a stator having a stator core supported between front-end and rear-end brackets, a stator coil which is connected into a three-phase alternating current connection being wound into the stator core, the stator core includes a core main body constructed by laminating a strip-shaped steel plate, the core main body including a base portion and a plurality of tooth portions protruding radially inwards from the base portion defining core main body slots, and an end plate which is thicker than the steel plate being disposed on at least one end surface of the core main body.

Abstract: A vehicular AC generator comprising a pair of cores included in a rotor and supported by a rotating shaft, a plurality of trapezoidal-shaped claws as magnetic poles protruding on the outer periphery edges of the pair of cores, and a pair of fans attached to the front side and the rear side of the cores, at least one of the fans having an outer diameter in the range between 85% and 96% of the outer diameter of each of the cores, each of the claws having a tapered portion for gradually decreasing the outer diameter of a shoulder portion of the claw in the direction toward the end surface of the core so that the outer diameter of at least one of the cores faced to the at least one of the fans becomes substantially the same as the outer diameter of the at least one of the fans, whereby the sound caused by cutting wind by the rotation of the centrifugal fans can be reduced without deteriorating the cooling efficiency of the coil ends of the stator.

Abstract: An axial length of an iron core of a stator is set larger than an axial length of a cylindrical part on which a field coils are wound. An axial thickness of a yoke part is set larger than a radial thickness of a claw-like magnetic pole part. The cylindrical part is separate from the yoke part and fixed to the yoke part with the cylindrical part in contact with the yoke part. Thus, the contact surface of the cylindrical part and that of the yoke part serve as a thermal resistance, respectively, thereby preventing heat from being transmitted from the yoke part to the cylindrical part.