AC generator for use in a vehicle

• US 6,114,783 A
• Filed: 05/07/1999
• Issued: 09/05/2000
• Est. Priority Date: 11/27/1998
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Asao, Yoshihito
• Primary Examiner(s): LaBalle, Clayton
• Assistant Examiner(s): Nguyen, Tran N
• Application Number:
  US09/306,638
• Time in Patent Office: 487 Days
• Field of Search: 310/52, 310/58, 310/59, 310/60 R, 310/61, 310/62, 310/63, 310/60 A, 310/68 D, 310/68 R, 29/596, 29/597, 29/598
• US Class Current: 310/58
• CPC Class Codes: H02K 11/05 Rectifiers associated with casings, enclosures or brackets
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132
• CPC Class Codes: H02K 9/06 with fans or impellers driven by the machine shaft

Abstract

A rectifier accommodating portion, a condenser accommodating portion, a regulator accommodating portion and a connector accommodating portion are recessed on the inner surface of a rear bracket, and baniers which constitute a cooling air passageway are integrally made to protrude axially from the surface of the inner wall of the rear bracket so as to separate between each accommodating portion. Further, intake openings and a connector receiving hole are provided through the rear bracket so as to communicate the rectifier accommodating portion, the regulator accommodating portion and the connector accommodating portion from the exterior while a plurality of exhaust openings are provided through the outer circumference in the circumferential direction.

Claims

1. An AC generator for use in a vehicle, comprising:

a shaft supported in a case so as to be able to rotate freely;

a rotor disposed in said case and composed of a pair of pole cores each having a plurality of claw portions protruding from the outer circumferential edge portion thereof, said pole cores being fixedly fitted over said shaft in an opposed relation to each other so that said claw portions are able to engage with each other;

a stator disposed within said case so as to be positioned around the periphery of said rotor;

centrifugal fans secured to both axial ends of said rotor;

a rectifier for rectifying an alternating current generated in said stator to a direct current;

a regulator for regulating an output voltage of said stator; and

a connector portion to which an external connector is fitted;

wherein said rectifier, said regulator and said connector portion are arranged circumferentially in a scattered manner on a plane intersecting at a right angle with the axis of the shaft at one end of said shaft so as not to overlap each other in the axial direction,

wherein intake openings are provided at one end surface of said case so as to face said rectifier and said regulator, and

wherein a plurality of exhaust openings arc provided at the outer circumference of said case in the circumferential direction;

said AC generator further comprising a cooling air passageway in which the air streams arc sucked from said intake openings by the action of said centrifugal fans, and subsequently cool said rectifier and said regulator wherein said air streams are blocked from flowing in the circumferential direction by a barrier configuration that separates a rectifier accommodation portion (50a), a condenser accommodation portion (50b), a regulator accommodation portion (50c), and a connector accommodation portion (50d), and are axially separated from each other and flow radially inward.

2. An AC generator for use in a vehicle as set forth in claim 1, wherein said cooling air passageway is defined by said barriers having an axial height and integrally formed with said case.

3. An AC generator for use in a vehicle as set forth in claim 1, wherein said regulator and said connector potion are integrally formed with a mold member, said rectifier is composed of a pair of heat sinks for supporting a plurality of diodes and a circuit board molded with a connection terminal, and said cooling air passageway is constituted by barriers having an axial height and integrally formed with said mold member and said circuit board.

4. An AC generator for use in a vehicle as set forth in claim 1, further comprising barriers having an axial height and disposed at the outer circumference of said connector portion so as to separate said connector portion from the air stream which has cooled said rectifier and said regulator.