Abstract: In an alternator, a voltage control device includes a control circuit IC chip, a radiating fin and a case. The radiating fin 253 has a base 256 that is fixed to the IC chip and radiating portions. The radiating portions protrudes from the base 256 and have substantially U-shaped cross sections, so that tubular air passages are formed between the radiating portions and a fixed surface of the IC chip. Each radiating portion has a central trunk and alternating branches, thereby rows of air passages are formed by the central trunk and rows of branches.

Abstract: A rotary electric machine has a stator winding made of a plurality of segments. The segments comprises a plurality of regular segments regularly arranged to provide a part of the stator winding and irregular segments disposed to provide a remaining part of the stator winding. The regular segments are covered with a polyester-imide. The irregular segments are covered with a polyamide-imide that provides a higher insulation performance than the polyester-imide. Therefore, it is possible reduce an amount of the polyamide-imide to ensure an insulation relating to the irregular segments.

Abstract: A rotary electric machine has a stator winding. The stator winding has a plurality of conductors wound one over another. The conductors are wound with left and right ends. Therefore, the stator winding on the stator core has an overlapped joined portion. This arrangement allows a high ratio of the conductors in the slot and is easy to manufacture.

Abstract: A rotary electric machine has a stator winding. The stator winding has a plurality of conductors wound one over another. The conductors are wound with left and right ends. Therefore, the stator winding on the stator core has an overlapped joined portion. This arrangement allows a high ratio of the conductors in the slot and is easy to manufacture.

Abstract: A brushless generator is composed of a front bracket, a rear bracket, a stator, a rotary shaft, a core, poles, a ring, a field core, a field winding bobbin, and a field winding. Air gaps are defined by facing surfaces between the field core and the core, between the poles and the stator, between one side of a pole and the field core, and between the core and another side pole. Magnetic coating made of magnetic particles and a binding material is applied to the surfaces which face the air gaps. A tensile strength of the magnetic coating is set smaller than a bonding strength of the same. Thus, in case that the surfaces to which the magnetic coating is applied is damaged by an external force, the magnetic coating does not peel but rather the breaking of the base material occurs.

Abstract: In an alternator, a voltage control device includes a control circuit IC chip, a radiating fin and a case. The radiating fin 253 has a base 256 that is fixed to the IC chip and radiating portions. The radiating portions protrudes from the base 256 and have substantially U-shaped cross sections, so that tubular air passages are formed between the radiating portions and a fixed surface of the IC chip. Each radiating portion has a central trunk and alternating branches, thereby rows of air passages are formed by the central trunk and rows of branches.

Abstract: A vehicle AC generator includes a stator core, a stator winding and a rectifier unit. The stator winding is comprised of plural phase-windings, plurality of first, second and third connection segments. Each phase-winding is comprised of plural U-shaped conductor segments and a pair of inclined portions. Each pair of the phase-windings that generates AC voltages a 180-degree-electric-angle different from each other is connected by one of the first connection segments to form a series-connected phase-winding. The series-connected phase-windings are connected by the second connection segments to form a multiple-phase stator winding that is connected to the rectifier unit.

Abstract: A vehicle AC generator includes a stator core, a stator winding and a rectifier unit. The stator winding is comprised of plural phase-windings, plurality of first, second and third connection segments. Each phase-winding is comprised of plural U-shaped conductor segments and a pair of inclined portions. Each pair of the phase-windings that generates AC voltages a 180-degree-electric-angle different from each other is connected by one of the first connection segments to form a series-connected phase-winding. The series-connected phase-windings are connected by the second connection segments to form a multiple-phase stator winding that is connected to the rectifier unit.

Abstract: A brushless generator is composed of a front bracket, a rear bracket, a stator, a rotary shaft, a core, poles, a ring, a field core, a field winding bobbin, and a field winding. Air gaps are defined by facing surfaces between the field core and the core, between the poles and the stator, between one side of a pole and the field core, and between the core and another side pole. Magnetic coating made of magnetic particles and a binding material is applied to the surfaces which face the air gaps. A tensile strength of the magnetic coating is set smaller than a bonding strength of the same. Thus, in case that the surfaces to which the magnetic coating is applied is damaged by an external force, the magnetic coating does not peel but rather the breaking of the base material occurs.

Abstract: A rotary electric machine has a stator winding made of a plurality of segments. The segments comprises a plurality of regular segments regularly arranged to provide a part of the stator winding and irregular segments disposed to provide a remaining part of the stator winding. The regular segments are covered with a polyester-imide. The irregular segments are covered with a polyamide-imide that provides a higher insulation performance than the polyester-imide. Therefore, it is possible reduce an amount of the polyamide-imide to ensure an insulation relating to the irregular segments.

Abstract: A rotary electric machine has a stator winding. The stator winding has a plurality of conductors wound one over another. The conductors are wound with left and right ends. Therefore, the stator winding on the stator core has an overlapped joined portion. This arrangement allows a high ratio of the conductors in the slot and is easy to manufacture.

Abstract: A larger-diameter fin is provided adjacent to a frame, while a smaller-diameter fin is provided adjacent to a protecting cover. The larger-diameter fin and the smaller-diameter fin are arranged parallel to each other in an axial direction with an intervening clearance so that their rectifying elements are disposed at opposite directions each other. The larger-diameter fin is offset outward in a radial direction. The smaller-diameter fin is offset inward in the radial direction. The protecting cover has an axial opening which introduces external air directly to the positive rectifying element. Furthermore, a radial ventilation passage is formed between the larger-diameter fin and the frame so as to pass the central position of the negative rectifying element. An opening, introducing external air directly, is formed at a radial-outer end of the radial ventilation passage.

Abstract: A flanged part of an insulating bobbin is formed with a first hook part for directing a lead wire of a field coil in a radially inward direction along an end surface of the flanged part, and a second hook part for directing the radially inwardly directed field coil in an axial direction. The lead wire of the field coil is arranged to extend in the radial direction from a coil-winding part of the field coil through the first hook part, and to extend in the axial direction through the second hook part.

Abstract: A larger-diameter fin is provided adjacent to a frame, while a smaller-diameter fin is provided adjacent to a protecting cover. The larger-diameter fin and the smaller-diameter fin are arranged parallel to each other in an axial direction with an intervening clearance so that their rectifying elements are disposed at opposite directions each other. The larger-diameter fin is offset outward in a radial direction. The smaller-diameter fin is offset inward in the radial direction. The protecting cover has an axial opening which introduces external air directly to the positive rectifying element. Furthermore, a radial ventilation passage is formed between the larger-diameter fin and the frame so as to pass the central position of the negative rectifying element. An opening, introducing external air directly, is formed at a radial-outer end of the radial ventilation passage.

Abstract: A rectifying unit is disposed axially adjacent to a rear cooling fan. The rectifying unit has a plus-pole heat dissipating fin and a minus-pole heat dissipating fin integrally connected by a terminal plate. The plus-pole heat dissipating fin has an elongation extending axially around the rear cooling fan to have direct cooling air from the fan. The minus-pole heat dissipating fin is fixed to the housing directly or via a heat conductive material to be electrically grounded. Slits are formed on the elongations of the plus-pole heat dissipating fin to have discharging cooling air therethrough. Further, elongations are formed on the both dissipating fins at their inner periphery proximate to an intake window of the housing. Thus, cooling capacity of the rectifying unit is enhanced.

Abstract: A rectifying unit for an alternator is composed of AC input terminal and cooling fins connected to output ends (including a neutral point) of a multi-phase stator coil, a negative-poled cooling fin which is grounded and fixed to a rear cover of the alternator, diodes whose anodes are soldered to the AC input fins and whose cathodes are welded to a positive output terminal, and diodes whose anodes are soldered to a negative-poled fin and whose cathodes are welded to the AC input fins.

Abstract: In a rectifying and voltage regulating unit of an AC generator, an AC input terminal, a DC output terminal, and an insulating member holding the respective terminals are commonly used by a rectifier and a voltage regulator so that a terminal block of the rectifier, a terminal block of the voltage regulator and a connector can be simultaneously molded in a single resin mold and no specific fastening member is necessary. The environmental resistibility of electrically connecting sections of the rectifier and the voltage regulator is enhanced by keeping the connecting sections from exposure by means of sealing the AC input terminal and the DC output terminal with the insulating member.