Denso Corporation

Nippondenso Co., Ltd.

Tokai Rubber Industries, Ltd.

Akiya Shichijyo

Shin Kusase

Hiroshi Ishida

Atsushi Umeda

Hiroaki Ishikawa

Shigenobu Nakamura

Takuzou Mukai

Hiroaki Kajiura

Shinichi Matsubara

Kenzo Mitani

Takaaki Kurahashi

Takafumi Tsuge

Kiyoaki Kamitani

Seiichi Tsurumoto

Masaaki Iwata

In a rectifying device of a vehicle ac generator, a positive-side radiating fin and a negative-side radiating fin are arranged to oppose each other in an axial direction and a terminal board is interposed therebetween. One of the fins, which is directly fixed to a frame, is substantially in an arc shape having a circular arc angle of equal to or more than 180 degrees and separated into two partial radiating fins at a substantially middle part in a circumferential direction. Each of the partial radiating fins has two fixing portions near its radially outer end. Screws are inserted into the fixing portions and tightened to threaded holes provided in the frame to fasten the rectifying device to the frame. Instead of separating the fin into the partial radiating fins, a groove is provided on a surface of the fin.

Vehicle ac generator

An ac generator for a vehicle includes a multi-poled rotor, a stator having a multi-phase stator winding which has output lead wires, a full-wave rectifier unit, and a frame having a wall supporting the stator at one side thereof and the rectifier unit at the other side. The output lead wires are grouped to form a plurality of bundles. The wall has lead-wire-holes formed to correspond to the bundles. The rectifier unit has input terminals disposed to correspond to the bundles and respectively connected to the output lead wires.

Lead-wire arrangement of vehicle ac generator

Lead-wire arrangement of vehicle AC generator

An alternator for a vehicle includes a stator, and an armature coil wound on the stator. A rectifier unit includes a terminal base. A connection terminal electrically connected with the armature coil extends into the terminal base. The connection terminal has an L-shaped cross-section. The connection terminal includes an exposed portion projecting from the terminal base. The exposed portion has an end electrically connected with the armature coil.

Vehicle alternator rectifier having L-shaped connection terminals

An AC generator for a vehicle includes a rotor, a stator having a three-phase stator winding, a three-phase full-wave rectifier unit, an insulation cover, and a frame for rotatably supporting the rotor. The rectifier unit includes a cooling fin structure having at least three positive diodes and three negative diodes fixed thereto and a terminal member having a wiring member connecting the positive and negative diodes to form the three-phase full-wave rectifier unit and three first partition members. The wiring member has first connecting portions connected to the positive and negative diodes and second connecting portions connected to three output leads of the stator winding. Each of the first partition members extend toward the insulation cover between one of the first connecting portions and the cooling fin structure.

Rectifier arrangement of vehicle AC generator

A vehicle AC generator includes a rectifier unit having plus cooling fin carrying a plurality of plus diodes, a minus cooling fin carrying a plurality of minus diodes, and a connection member disposed between the plus and minus cooling fins for insulating the two fins and connecting the plus and minus diodes. A plurality of U-shaped terminal members axially extend from the connection member which respectively guide the leads of the armature winding. Each of the terminal members has three longitudinal side walls forming generally rectangular cross-section, one end connected to the rectifier unit, the other end connected to one of the leads, and a heat-block portion having at least two of the side walls.

Terminal arrangement of vehicle AC generator

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.

AC generator for vehicle

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.

Rotary electric machine having lundell type pole core

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.

Rotor of an AC generator for a vehicle

An alternating current generator having a first Y-form three-phase connecting circuit including three first windings connected with each other in a Y-form, a first rectifying circuit for rectifying currents output from output terminals of the three first windings, a second Y-form three-phase connecting circuit including three second windings connected with each other in a Y-form, and a second rectifying circuit for rectifying currents outputted from output terminals of the three second windings. The three first windings are inserted in slots of a stator core so that the three first windings have phase differences of approximately 120 degrees from each other. Each of the three second windings is divided into first and second winding portions which are inserted in separate slots of the stator core, in which the three first windings are inserted so that resultant output vectors of the respective two divided windings have respective phase differences of approximately 30 degrees with respect to output vectors of the respective three first windings. By virtue of the above-mentioned structure, the number of slots in the stator core is reduced, the ripple contained in a resultant output waveform is decreased by adding together output currents of the first and second rectifying circuits, respectively, and heat generation due to a circulating current flowing in the connecting circuits can be prevented by avoiding the use of a delta-form three-phase connecting circuit.

Alternating current generator for vehicles

A stator coil of a rotary electric machine includes a three-phase Y-form connection circuit including first windings Y1, Y2 and Y3, which are connected in Y-form, and a three-phase delta-form connection circuit including second windings .increment.x3, .increment.y3 and .increment.z3 which are connected in delta-form, wherein the second windings .increment.x3, .increment.y3 and .increment.z3 are sequentially inserted in slots of a stator core to have a phase difference of 120.degree. therebetween, and each of the first windings Y1, Y2 and Y3 is divided into two windings, and the divided first windings are separately inserted in the slots, in which the second windings .increment.x3, .increment.y3 and .increment.z3 have been inserted, so that the resultant composite voltage vector of each pair of the divided first windings is shifted by 30.degree. in phase from the voltage vector of one of the second windings .increment.x3, .increment.y3 and .increment.z3. By virtue of the foregoing structure of the rotary electric machinery, the number of slots decreases and an electromagnetic noise is reduced, since a magnetic force due to the air gap magnetomotive force distribution becomes substantially constant independently of a rotational position of a rotor.

Growing community of inventors

Ama-gun, Japan

Akiya Shichijyo