A.C. generator for use in a vehicle

• US 6,407,476 B1
• Filed: 11/14/2000
• Issued: 06/18/2002
• Est. Priority Date: 05/12/2000
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Nishimura, Shinji
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): MOHANDESI, IRAJ A
• Application Number:
  US09/711,093
• Time in Patent Office: 581 Days
• Field of Search: 310/179, 310/180, 310/184, 310/188, 310/189, 310/201, 310/68.D, 322/46, 322/89, 322/90, 322/20
• US Class Current: 310/180
• CPC Class Codes: H02K 19/36 Structural association of synchronous generators with auxiliary electric devices influencing the characteristic of the generator or controlling the generator, e.g. with impedances or switches
• CPC Class Codes: H02K 19/365 with a voltage regulator
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32

Abstract

An a.c. generator for a vehicle includes: a rotor rotatably supported within a case; and a stator having a cylindrical stator core in which a plurality of slots are formed at given intervals circumferentially so as to open toward the inner peripheral side thereof and a stator winding constructed by connecting three single-phase windings wound on the stator core into Y connection, the stator being fitted onto the case so as to surround the rotor, wherein each of the single-phase windings comprises a first winding which is connected into the Y connection and a second winding which is connected in series to the first winding and has a given phase difference in electrical angle with respect to the first winding, and wherein a connecting portion of the first winding and the second winding constituting each of the single-phase windings is connected to a pair of three-phase diode bridges, and an end portion of the second winding constituting each of the single-phase windings is connected to another pair of three-phase diode bridges.

Claims

1. An a.c. generator for a vehicle, comprising:

a rotor rotatably supported within a case; and

a stator comprising a cylindrical stator core in which a plurality of slots are formed at given intervals circumferentially so as to open toward the inner peripheral side thereof and a stator winding constructed by connecting three single-phase windings wound on said stator core into a Y connection, said stator being fitted onto said case so as to surround said rotor,

wherein each of said single-phase windings comprises a first winding which is connected into the Y connection and a second winding which is connected in series to said first winding and has a given phase difference in electrical angle with respect to said first winding, and

wherein a connecting portion of said first winding and said second winding constituting each of said single-phase windings is connected to a pair of three-phase diode bridges, and an end portion of said second winding of each of said single-phase windings is connected to another pair of three-phase diode bridges.

2. The a.c. generator for a vehicle as claimed in claim 1, wherein the neutral point of said first windings connected into the Y connection is connected to a diode bridge.

3. The a.c. generator for a vehicle as claimed in claim 1, wherein in each of said single-phase windings, the number of turns of said second windings are larger than the number of turns of said first windings.

4. The a.c. generator for a vehicle as claimed in claim 1, wherein in each of said single-phase windings, the diameter of a conductor of said second windings is larger than the diameter of a conductor of said first windings.

5. The a.c. generator for a vehicle as claimed in claim 1, wherein in each of said single-phase windings, said first windings are wound on said stator core so that said first windings are located on a deeper side relative to the slot depth direction within said slots, and said second windings are wound on said stator core so that said second windings are located on a shallower side relative to the slot depth direction within said slots.

6. The a.c. generator for a vehicle as claimed in claim 1, wherein said first winding and said second winding constituting each of said single-phase windings are so structured as to have a phase difference of 120°

in electrical angle.

7. The a.c. generator for a vehicle as claimed in claim 6, wherein the neutral point of said first windings connected into the Y connection is connected to a diode bridge.

8. The a.c. generator for a vehicle as claimed in claim 6, wherein in each of said single-phase windings, the number of turns of said second windings are larger than the number of turns of said first windings.

9. The a.c. generator for a vehicle as claimed in claim 6, wherein in each of said single-phase windings, the diameter of a conductor of said second windings is larger than the diameter of a conductor of said first windings.

10. The a.c. generator for a vehicle as claimed in claim 6, wherein in each of said single-phase windings, said first windings are wound on said stator core so that said first windings are located on a deeper side relative to the slot depth direction within said slots, and said second windings are wound on said stator core so that said second windings are located on a shallower side relative to the slot depth direction within said slots.