Abstract: A rotor structure for a motor includes a rotor body having two sides, two sun plates each attached to one of the two sides of the rotor body and each having a copper wire wound thereon, and two end caps each secured to a corresponding one of the two sun plates and each enclosing the copper wire therein. Each of the two end caps includes a plurality of plugs each inserted into the respective sun plate for securing the end cap to the respective sun plate.

Abstract: An alternator for vehicle includes a stator and a rotor. The stator is composed of a stator core which is a lamination of steel-sheets and stator winding. The rotor is composed of a pole core, a pair of cooling-fans disposed on opposite axial ends of the pole core and a field coil. The pole core is composed of a cylindrical center core, a pair of disk yokes extending from the center core and claw-pole-pieces extending from the disk yokes to longitudinally cover the field coil. In such a generator, a ratio Y/X of a circumferential distance Y between the adjacent claw-pole-pieces to a circumferential width X of the tooth edges and a ratio r1/R1 of the inside diameter r1 of a cylindrical space where the claw-pole-pieces are disposed to the outside diameter R1 of the same are in specific ranges.

Abstract: A magnet type stepping motor which has (1) a stator with three-phase stator windings, and 6m pieces of stator main pole arranged side by side, where m is an integer and .gtoreq.1, the stator windings of one phase are wound around every two stator main poles among the 6m pieces of the stator main pole, wherein when the stator windings of one phase are excited with a direct current, m pieces of N pole and M pieces of S pole are formed alternately on the 6m pieces of stator main pole, and (2) a rotor of a cylindrical permanent magnet magnetized in the circumferential direction to form Z/2 pieces of N pole and Z/2 pieces of S pole alternately, where Z is the number of rotor poles.

Abstract: A pair of pole cores comprises shoulder portions positioned on both axial ends of the diametrically outermost portions of the claw-shaped magnetic poles formed into beveled or curved outer circumferential surfaces, and diametrically outermost leading-edge face portions positioned on the leading edges in the direction of rotation at both axial ends of the diametrically outermost portions of the claw-shaped magnetic poles each being formed into an outer circumferential surface inclined in a circumferential direction by a surface which passes through a point A where the inner circumferential edge of the diametrically outermost leading-edge face positioned on the leading edge in the direction of rotation of the diametrically outermost portion of each of the claw-shaped magnetic poles intersects a plane which passes through an axial end of the stator core and perpendicularly intersects the axis of the shaft, and a point B located on a ridge line where the diametrically outermost leading-edge face intersects the be

Abstract: A rotor for an automotive alternator comprises a cylindrical bobbin having a cylindrical portion, a pair of first and second annular flange portions projecting perpendicularly from both ends of the cylindrical portion, a recessed groove disposed at an angle to the radial direction in the inner wall of the first flange portion, and an anchor portion disposed on an outer circumferential portion of the first flange portion in close proximity to the outer circumferential end of the recessed groove, the bobbin being fitted over the base portions of the pair of field cores; and a field winding wound a predetermined number of turns into multiple layers on the cylindrical portion of the bobbin, wherein the field winding has a flat shape, the starting end of the field winding being wound around the anchor portion and housed in the recessed groove, then drawn from the inner circumferential end of the recessed groove onto the outer circumferential surface of the cylindrical portion of the bobbin, and additionally taken

Abstract: A rotor 2 comprises of a pair of claw shape magnetic poles 3N and 3S and plural permanent magnets 5. The permanent magnet 5 is arranged between claw portions of the claw shape magnetic poles 3N and 3S. A permanent magnet fly-out prevention member 61 is arranged at an outer periphery of the claw shape magnetic poles 3N and 3S and prevents the fly-out of the permanent magnet 5 when the rotor 2 rotates. A permanent magnet holding member 62 holds the permanent magnet 5 from an inner periphery side. In a construction in which the permanent magnet fly-out prevention member 61 is arranged between the claw portions of the claw shape magnetic poles 3N and 3S, the working operation for arranging the permanent magnet 5 between the claw portions of the claw shape magnetic poles 3N and 3S can be improved, thereby a vehicle use AC generator having an improved electric power generation efficiency can be provided.

Abstract: A synchronous rotary electrical machine. According to the first aspect of the present invention, the electrical phase difference between the stator teeth and the nearest rotor teeth is a stepwise function of azimuthal stator tooth position. In a preferred embodiment of the present invention, the stator teeth grouped into two or more sets, and the machine is multiphase. Each set is associated with an armature winding wound in a plane perpendicular to the rotational axis of the machine. The rotor teeth are spaced at the same pitch as the stator teeth of a single set. When direct electrical current is provided to an excitation winding concentric with the rotational axis, an m-phase alternating EMF is induced in the armature windings. With two tandem groups of such sets of stator teeth, each with its own tooth pitch, alternating EMFs of different frequencies are generated. Two alternating EMFs of different frequencies are heterodyned to provide alternating EMF at the difference frequency.

Abstract: It is an object of this invention to provide a compact high-power alternator for a vehicle which is good in cooling performance, efficiency, and cost without decreasing a coil resistance or using a magnet. The alternator for the vehicle includes a stator and a rotor. The rotor includes a Lundel-type iron core and a field coil provided on the Lundel-type iron core. The Lundel-type iron core has a cylindrical portion (71), a yoke portion (72), and a claw-like magnetic pole portion (73). The field coil is provided on the cylindrical portion (71). The yoke portion (72) extends from the cylindrical portion (71) in a radially outward direction. The claw-like magnetic pole portion (72) is connected to the yoke portion (72), and is formed so as to surround the field coil. The stator includes a multiple-layer iron core (32). A ratio of an axial-direction length L1 of the multiple-layer iron core (32) to an axial-direction length L2 of the cylindrical portion (71) of the Lundel-type iron core is in a range of 1.

Abstract: A rotary electrical machine has at least one stator and a rotor. The stator includes at least one armature winding received in at least one pair of slots. The rotor includes flux switching arrangement, which is adapted for selectively establishing closed magnetic circuits which pass around the turns of the armature winding. The arrangement for switching the flux comprises at least one permanent magnet adapted to establish a magnetic flux which is looped on itself in one circumferential direction of the rotor, together with at least one excitation winding for establishing an adjustable magnetic flux locally in a circumferential direction opposite to the direction of the flux produced by the magnets.

Abstract: It is an object of this invention to provide a compact high-power alternator for a vehicle. An alternator (1) for a vehicle includes a stator (2) and a rotor (3). The stator (2) serves as an armature. The rotor (3) operates to generate magnetic field. A front cooling fan (12) and a rear cooling fan (13) are fixed to two axial-direction ends of the rotor (3) respectively. The outside diameter (R0) of the cooling fans (12, 13) is equal to the outside diameter (R1) of the rotor (3) which is multiplied by a value of 0.90 to 0.96. The stator (2) includes a stator iron core (32), a stator winding, and an insulator (34) for providing insulation between the stator iron core (32) and the stator winding. Coil end groups (31a, 31b) extend from axial-direction end surfaces of the stator iron core (32) respectively. In the coil end groups (31a, 31b), gaps are formed between portions of the stator winding.

Abstract: An alternator for a vehicle includes a field rotor having a pair of pole cores with a plurality of claw poles, a stator disposed around the rotor, and a frame for supporting the rotor and the stator. The frame has a plurality of air intake windows at axial ends thereof and a plurality of air discharge windows at circumferential portions thereof. The rotor has a cooling fan with a plurality of fan blades disposed at one end of the pair of pole cores. The number of the blades is smaller than the number of the claw poles.

Abstract: A flux commutating electrical machine includes a stator and a rotor. The rotor selectively establishes closed magnetic circuits around sections of the armature coils. Excitation permanent magnets establish a magnetic flux closing on itself in a circumferential direction and excitation coils establish a localized variable magnetic flux in an opposite direction to that of the flux produced by the magnets. Each magnet is housed in a first rotor part defining a first pair of rotor poles, and the coils are disposed around a second rotor part ends of which define a second pair of poles. The rotor has between the adjacent first and second rotor parts third rotor parts forming with the first and second parts a circumferential magnetic conduction path.

Abstract: A superconducting rotating machine includes a direct current field excitation source and an alternating current armature winding mounted on a stationary support member, at least one of which includes a superconducting material, a core member formed of a magnetic permeable material and rotatable around the static support member, and a refrigerator unit which cryogenically cools at least one of the field excitation source and the armature winding. The superconducting rotating machine may have a construction for providing polyphase (e.g., three-phase) power.

Abstract: The present invention resides in an improved disc-type brushless alternator which contains an alternator housing, a shaft rotatably attached to the alternator housing, a plurality of rotors and a pulley at one end. The alternator housing is attached to a stator. The rotors and stators have serrated surfaces wherein the serrated surfaces of said rotors and stators face each other and define an axial air gap there between.

Abstract: A claw pole generator has a drive shaft, two pole wheel halves arranged on the drive shaft and each having a disk-shaped plate and claw shaped magnet poles spaced from one another in a peripheral direction and having magnet pole tips, the magnet poles of one pole wheel half being inserted in intermediate spaces of the magnet poles of the other of the pole wheel halves, permanent magnet parts provided for a dissipation flux compensation and arranged in intermediate spaces of the plate, the magnet poles extending in a predetermined direction, and a mounting device connecting the magnet pole tips with a neighboring one of the plates, the magnet poles extending toward an outer edge of a neighboring one of the plates, the mounting device having vanes operating as an ventilation element.

Abstract: An alternator for a vehicle, including a rotating yoke composed of a pair of hook-shaped magnetic poles arranged in facing relation to each other and being concentrically attached to a shaft, a magnetic-field winding for generating a magnetizing force in the hook-shaped magnetic poles, stator magnetic poles arranged in the periphery of the rotating yoke, magnets for decreasing leakage magnetic flux arranged between the hook portions of the hook-shaped magnetic poles, and protection covers arranged in the positions of the outer surface of the magnets fixed to the side surfaces of the hook portions between the hook portions such that the outer surface does not become higher than the outer periphery of the hook portion.

Abstract: A rotor for an automotive alternator comprises a cylindrical bobbin fitted over the base portions of a pair of field cores having a cylindrical portion, a pair of first and second annular flange portions projecting perpendicularly from both ends of the cylindrical portion, a recessed groove disposed at an angle to the radial direction in the inner wall of the first flange portion, and an anchor portion disposed on an outer circumferential portion of the first flange portion in close proximity to the outer circumferential end of the recessed groove; and a field winding having a circular cross-section, the starting portion of which is wound around the anchor portion and housed in the recessed groove, then drawn from the inner circumferential end of the recessed groove onto the outer circumferential surface of the cylindrical portion of the bobbin, and additionally wound a predetermined number of turns into multiple layers on the cylindrical portion of the bobbin, at least one portion of the field winding exclud

Abstract: A vehicle alternator is constructed such that satisfies the relationship0.3.ltoreq.{Br.multidot.(t1+t2).multidot.L}/(W.multidot.t1.multidot.cos.the ta.).ltoreq.2.0where Br represents the residual magnetic flux density of each of the magnets, L represents the length from the short side at the tip to the long side at the base of each of the claw-shaped magnetic poles, W represents the width in the circumferential direction at the base, 2.theta. represents the angle formed by an oblique side which joins one end of the tip to one end of the base and another oblique side which joins the other end of the tip to the other end of the base, t1 represents the thickness of each of the claw-shaped magnetic poles at the base, and t2 represents the thickness of each of the claw-shaped magnetic poles at the tip.

Abstract: A magnet type stepping motor which has (1) a stator with three-phase stator windings, and 6 m pieces of stator main pole arranged side by side, where m is an integer and.gtoreq.1, the stator windings of one phase are wound around every two stator main poles among the 6 m pieces of the stator main pole, wherein when the stator windings of one phase are excited with a direct current, m pieces of N pole and M pieces of S pole are formed alternately on the 6 m pieces of stator main pole, and (2) a rotor of a cylindrical permanent magnet magnetized in the circumferential direction to form Z/2 pieces of N pole and Z/2 pieces of S pole alternately, where Z is the number of rotor poles.

Abstract: A method of manufacturing a claw-type magneto-electric rotor. The claw type rotor comprising magnetic material parts forming the poles of the rotor and amagnetic material parts separating the poles of opposite polarity confined in a hollow cylindrical casing in the shape of a body of revolution, wherein the casing is made from an amagnetic material. The method includes a step of filling the hollow cylinder with the magnetic material parts and amagnetic material parts and a step of isostatic compression of the combination of these parts and the hollow casing cylinder. Each magnetic or amagnetic material part is made from a plurality of nested, independent, matched and coaxial tube elements each having lateral edges, transverse ends and a lateral face having the exterior shape of the corresponding radial thickness of the magnetic or amagnetic material part concerned.

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 portions 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: It is an object of this invention to provide a compact high-power alternator for a vehicle. An alternator for a vehicle includes a stator serving as an armature, and a rotor serving to generate a magnetic field. The rotor includes a pole core having a cylindrical portion, a yoke portion, and a claw-like magnetic pole portion. The stator includes a stator iron core, an armature coil, and an insulator. A ratio L1/L2 of an axial-direction length L1 of the stator iron core to an axial-direction length L2 of the pole core is in a range of 0.7 to 1.0.

Abstract: A synchronous machine, in particular a generator for a motor vehicle, has an excitation system with a plurality of electrically excited individual poles in a rotor, preferably in form of claw poles which are excited by at least one common excitation coil, wherein for compensation of a magnetic stray flux, permanent magnets are inserted in free spaces between the axially oriented claw poles on the pole plates mounted on the axial ends of the rotors, and the permanent magnets are supported by a holder against centrifugal forces, so that the insertion of the permanent magnets is simplified and facilitated by a simple and inexpensive holder which reduces parts and mounting expenses.

Abstract: A synchronous machine, in particular a generator for a vehicle, has an excitation system with a plurality of electrically excited individual poles in a rotor, preferably in form of claw poles excited by at least one common excitation coil, in which for compensation of a magnetic stray flux, in the free spaces between the axially oriented claw poles permanent magnets are inserted at the axial ends of the pole plates of the rotor, so that the permanent magnets are supported by a holder against centrifugal forces and held by it, and therefore an especially simple and inexpensive holder is formed which considerably simplifies and facilitates the insertion of the permanent magnets.

Abstract: In a rotor of a rotary machine having a plurality of claw poles extending in the axial direction of the rotor alternately from opposite ends and a plurality of auxiliary permanent magnets held between adjacent two of said claw poles, each of the claw poles has trapezoidal outer and inner peripheries with the sides thereof forming parallelopiped rectangular spaces between adjacent claw poles. The permanent magnet members are fitted to the spaces so that the side walls of the magnet members extend to the inside of the claw poles to function as an axial flow fan.

Abstract: A stator winding is composed of a first and second of three-phase windings. Each of them has three separate Y-connected or .DELTA.-connected coils which are wound on the teeth of the stator core at a 2 .pi./3 short pitch. The second three-phase winding is shifted from the first winding by .pi./3 radian in the electric angle which is one tooth pitch.

Abstract: An alternator for a vehicle includes a stator having a stator core, a stator winding having a first coil-end group and a second coil-end group on the opposite ends of the stator core The alternator further includes a rectifier disposed near the first coil-end group and an air drive unit for cooling the first and second coil-end groups. Because the first coil-end group has a larger surface to be cooled than the second coil-end group, temperature of both coil end groups is controlled so that they become equal.

Abstract: A vehicle alternator is provided with a metal plate 133a to allow a resin fan 133 to be secured to an end surface of a polar core by welding. The metal plate may comprise an flat annular plate insertion molded into the resin fan, or disks disposed in a circle concentric to the resin fan, which is insertion molded into the resin fan an annular flange portion 343b which clamps the resin fan to the polar core and a cylindrical portion 343a may be provided, or a flange portion 443b and a cylindrical portion 443a may be provided. An annular flange portion 543b which clamps the resin fan to the polar core and a hollow cylindrical portion 543a and a flat annular plate portion 543d which extends radially inwards therefrom may be provided.

Abstract: A rotor of an alternator having a plurality of claw poles, a plurality of auxiliary permanent magnets and a magnet holder for the permanent magnets. The magnet holder is composed of soft resinous holding members, connecting bands and heat-resistant members. Each of the heat resistant members is disposed between the claw poles and holding members to prevent heat transfer from the claw poles to the holding members.

Abstract: A rotor of a rotary electric machine has a pair of pole core members each of which has a core portion and a plurality of claw poles extending axially from outer periphery of the core portion. A plurality of magnet holders with permanent magnets are held therein and a connection member axially fixes the magnet holders to the pole core members. The connection member has a pair of end plates disposed at opposite ends of the rotor and a plurality of connecting rods extending axially to mechanically connect the magnet holders from opposite ends.

Abstract: A "claw pole" or Lundell rotor has permanent magnets included therein, each permanent magnet disposed between an adjacent pair of pole fingers. The permanent magnets each have a magnetization polarity at an angle between radial and tangential with respect to the axis of rotation of the rotor.

Abstract: A brushless synchronous rotary electrical machine comprises stationary stator and "inner" windings. Only the rotor moves. The inner windings are stationary helical windings, concentric with the rotor shaft and attached to the stator armature. Variation in time of the magnetic field associated with the rotor is provided by two magnetically interactive (ferromagnetic or ferrimagnetic) rotor projections that sweep past the sides of the inner windings as the shaft rotates, each projection including a certain number of lobes. The stator includes a magnetically active hub, within which the rotor rotates, from which project magnetically active stator cores. The stator windings are wound helically around the stator cores. Because all windings are stationary, brushes and rings are not needed. With three times as many stator cores as lobes in each projection, the machine functions as a three-phase generator.

Abstract: The present invention prevents the degradation of the power generating efficiency of an alternating current generator by preventing the expansion of an air gap formed between pole cores and a stator core, achieves low-noise operation by preventing generation of high-frequency impact magnetic noise, and makes it possible to relieve strains applied on a magnet holder. The present invention utilizes sixteen magnets, each of which fits between two of sixteen claw-like magnetic poles formed on the outer periphery of Lundell-type pole cores, which rotates integrally with a shaft. The magnets are caught and stopped by a magnet holder which has been formed by interconnecting zig-zagging segments and has elasticity as a whole. Here, the permanent magnets are held by the magnet holder so that the magnet holder does not protrude towards the rotor side from the outer peripheral face of the Lundell-type pole cores and the contacting faces of the magnet holder contact the outer faces of the permanent magnets.

Abstract: A magnet holding member is mounted onto a rotor of an alternator, and holds permanent magnets inserted between the claws of pole cores. The magnet holding member has twelve housing parts each of which has corrugated side surfaces which serve as shock absorbing structures to relieve stress when excessive stress is exerted thereon by the claws of the pole cores. The magnet holding member is manufactured in a state in which the housing parts are arranged in the shape of a belt and are connected with connecting parts. The magnet holding member is bent into an annular shape after the permanent magnets are pressed into the housing parts, and is then mounted onto the rotor. To facilitate ease of manufacture of the magnet holding member, the openings of each housing part face the same direction.

Abstract: A rotor of an alternator which is composed of a Lundell type core has a wire wound spirally around the rotor. The wire binds the claw poles at equal intervals from the tip to the base of each claw pole, thereby restricting the radial expansion of the claw poles due to centrifugal forces. The wire is made of a non-magnetic material, and is received in grooves formed on the outer circumferential surface collectively formed by the claw poles.

Abstract: A rotor for a dynamo-electric machine is capable of reducing the leakage of magnetic flux between triangular magnetic poles, making it possible to protect magnets disposed between the triangular magnetic poles from damage. The rotor is equipped with: a rotor coil through which current flows to generate magnetic flux; a field core which is provided such that it covers the rotor coil and which is composed of a first field core member and a second field core member having a triangular magnetic poles, respectively; a plurality of magnets which are disposed between adjacent triangular magnetic poles and which have been magnetized in a direction so as to reduce the leakage of the magnetic flux between the triangular magnetic poles. Each magnet is constituted by a first magnet section secured by a securing means to the triangular magnetic pole of the first field core member and a second magnet section secured by a securing means to the triangular magnetic pole of the second field core member.

Abstract: An electrical machine, especially a generator for vehicles, having a rotor rotatably supported in a stator housing is proposed, the rotor having an exciter winding (24), disposed in a manner fixed against relative rotation coaxially to a rotor shaft, the winding ends (26, 28) of the exciter winding being extended to wiper rings disposed on the rotor shaft. For the sake of simple centrifugal force-proof fixation of the exciter winding, it is provided that the exciter winding (24) is disposed on a winding carrier (11), which has means (32, 33) for firmly clamping the winding ends (26, 28) (FIG. 2).

Abstract: In one embodiment of the present invention, a rotor for an electrical machine comprises a first pole piece and a second pole piece together defining an axis of rotation of the rotor, each pole piece comprising a generally disc-shaped body having a circumference. Each pole piece further has a plurality of angularly-spaced pole fingers extending axially from the circumference of the body of the pole piece. The rotor additionally includes a plurality of permanent magnets, each permanent magnet affixed to a body of a pole piece between two pole fingers of the pole piece.

Abstract: A method of manufacturing a claw-type magneto-electric rotor. The claw type rotor comprising magnetic material parts forming the poles of the rotor and amagnetic material parts separating the poles of opposite polarity confined in a hollow cylindrical casing in the shape of a body of revolution, wherein the casing is made from an amagnetic material. The method includes a step of filling the hollow cylinder with the magnetic material parts and amagnetic material parts and a step of isostatic compression of the combination of these parts and the hollow casing cylinder. Each magnetic or amagnetic material part is made from a plurality of nested, independent, matched and coaxial tube elements each having lateral edges, transverse ends and a lateral face having the exterior shape of the corresponding radial thickness of the magnetic or amagnetic material part concerned.

Abstract: A rotor for an electrical machine according to one embodiment of the present invention comprises a shaft defining an axis of rotation of the rotor, and first and second pole pieces affixed to the shaft for rotation therewith and together defining an interior cavity. The rotor additionally includes a slip ring affixed to the shaft for rotation therewith. Further, the rotor comprises a field-generating coil disposed within the interior cavity, the coil comprising a plurality of turns of electrical wire, the electrical wire further having a section extending to and electrically coupled to the slip ring. Also, the rotor has a retainer disposed exterior to the cavity and adjacent the first pole piece, the retainer comprising a radially-extending channel containing a portion of the section of electrical wire.

Abstract: In one embodiment of the present invention a rotor for an electrical machine comprises a shaft having a radially-reduced portion, the shaft defining an axis of rotation of the rotor. The rotor additionally includes a pole piece having a bore, the pole piece mounted on the shaft for rotation therewith about the axis. Further, the rotor comprises a member located about the shaft in the radially reduced portion and interference fit within the bore of the pole piece. In a second embodiment of the present invention, an electrical machine comprises a rotor which further comprises a shaft defining an axis of rotation of the rotor, a pole piece affixed to the shaft for rotation therewith and a rotor stop slip fit onto the shaft and bearing against the pole piece. The rotor stop also bears against another component of the electrical machine to define an axial position of the rotor within the electrical machine.

Abstract: A bicycle generator-containing hub having a hub spindle (6), a hub body (2) rotatably mounted on the hub spindle (6), and a generator (10) disposed inside the hub body (2).The generator includes a cylindrical magnet assembly (12) having north poles and south poles arranged alternately along an inner peripheral wall of the hub body (2), and a plurality of generating coil units (11a, 11b, 11c) arranged inside the cylindrical magnet assembly (12) and axially of the hub spindle.Each of the generating coil units includes a first core element (50a, 50b, 50c) and a second core element (60a, 60b, 60c) opposed to each other axially of the hub spindle, and a generating coil (14) disposed between the first and second core elements to be coaxial with the hub spindle. The first core element has magnetic poles (51a, 51b, 51c) arranged at intervals in peripheral positions thereof and extending toward the second core element.

Abstract: An alternating current generator for a vehicle, in which durability is improved, magnetic fluxes are prevented from leaking, and noises are reduced. In the alternating current generator, a ring made of a steel material is disposed so as to abut against field core claws and on the outer peripheral side of a field winding. Resin permanent magnets which are molded onto the ring are disposed between the field core claws so as to abut against the field core claws, respectively.

Abstract: An AC generator has a rotor with permanent magnets disposed between claw poles. The rotor has Lundell-type pole cores having a boss portion where a field coil is wound and claw poles. The permanent magnets are sintered ferrite magnets and disposed between opposite side surfaces of the adjacent claw poles and magnetized to have the same magnetic pole as the claw pole adjacent thereto. A ratio between the cross-sectional area per pole of the magnetic path of the boss portion and peripheral surface area of the claw poles facing the teeth of the stator core is designed to be between 70% to 120%.

Abstract: A brushless synchronous rotary electrical machine comprises stationary stator and "rotor" windings. Only the rotor moves. The rotor winding is a stationary helical winding, concentric with the rotor shaft and attached to the stator armature. Variation in time of the magnetic field associated with the rotor is provided by one or more magnetically interactive (ferromagnetic or ferrimagnetic) projections from the rotor that sweep past the sides of the rotor winding as the shaft rotates. Because all windings are stationary, brushes and rings are not needed. The geometries of the rotor, of the stator windings, and of the magnetically interactive part of the stator armature are arranged so that the entire length of the wire in the windings participates in the generation of AC current (in a generator) or torque (in a motor), and so that loss of power to eddy currents is minimized.

Abstract: In a rotor of an AC generator for a vehicle, a coil bobbin, around which rotor coil is wound, includes a bobbin body having a first through hole at a winding drum portion and is made of hard resin. A first hole member is kept at the first through hole and is made of good thermal conductivity rubber. An outer peripheral layer is formed integrally with the first hole member and is made of good thermal conductivity rubber covering the outer peripheral surface of the winding drum portion. An improved rotor of an AC generator for a vehicle is provided, in which a regular winding property of the rotor coil is improved and at the same time, heat of the rotor coil can be more effectively radiated to the rotor core side so that generator output can be improved.

Abstract: The present invention provides a rotor for an electrical machine. The rotor comprises first and second pole pieces defining an axis of rotation of the rotor. The first pole piece comprises a body and a plurality of pole fingers extending axially from the body of the first pole piece. The second pole piece comprises a body and a plurality of pole fingers extending axially from the body of the second pole piece, the pole fingers of the second pole piece intermeshed with the pole fingers of the first pole piece. The rotor also comprises a fan affixed for rotation with the first pole piece and the second pole piece, the fan having a plurality of pockets, each pocket containing a permanent magnet.

Abstract: The present invention prevents the degradation of the power generating efficiency of an alternating current generator by preventing the expansion of an air gap formed between pole cores and a stator core, achieves low-noise operation by preventing generation of high-frequency impact magnetic noise, and makes it possible to relieve strains applied on a magnet holder. The present invention utilizes sixteen magnets, each of which fits between two of sixteen claw-like magnetic poles formed on the outer periphery of Lundell-type pole cores, which rotates integrally with a shaft. The magnets are caught and stopped by a magnet holder which has been formed by interconnecting zig-zagging segments and has elasticity as a whole. Here, the permanent magnets are held by the magnet holder so that the magnet holder does not protrude towards the rotor side from the outer peripheral face of the Lundell-type pole cores and the contacting faces of the magnet holder contact the outer faces of the permanent magnets.

Abstract: An improved rotor shaft for an alternator reduces the number of corresponding parts thereof. The rotor shaft includes a reinforced insert embedded within a shaft for preventing buckling, the shaft being molded using an engineering plastic; a threaded portion formed at one end of the shaft; a pulley engaging portion formed at the other end of the shaft; a rear bearing engaging portion inwardly formed from the pulley engaging portion; a spline inwardly formed from the rear bearing engaging portion for tightening the rotor; and a small diameter portion outwardly formed from the threaded portion.

Abstract: An improved construction of a .?.Randel.!. .Iadd.Lundell.Iaddend.-type rotor of a vehicle-mounted alternator, capable of reducing the windage noise which is produced as a result of interference between the rotor and the stator of the alternator. The rotor has a pair of pole cores provided with a plurality of mutually meshing claws, and an exciting coil disposed at the inner side of the pole cores. Spacers in the form of an integral ring or discrete wedges are fitted in the spaces between adjacent pole core claws so as to provide a substantially smooth cylindrical outer peripheral surface of the rotor portion facing the radial teeth on the stator.