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AC generator with annular permanent magnets

  • US 5,132,581 A
  • Filed: 02/22/1991
  • Issued: 07/21/1992
  • Est. Priority Date: 02/26/1990
  • Status: Expired due to Term
First Claim
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1. An AC generator comprising:

  • a rotor having at least a first and second magnetic pole core opposing each other and similar in shape and size, said magnetic pole core having a center hole for piercing by a shaft of said rotor, said first and second magnetic pole cores each including a boss portion of cylindrical form having a given wall thickness surrounding said center hole, a projecting portion extending from said boss portion in a radial direction of said rotor, and a claw-shaped magnetic pole portion extending in an axial direction of said rotor from an end of said projecting portion that extends in said radial direction of said rotor, wherein said claw-shaped magnetic pole portions of said first and second magnetic pole cores extend in opposite axial directions of said rotor and oppose each other in said axial direction;

    a stator disposed around said rotor with a predetermined gap between said stator and said rotor, said stator having a stator winding;

    a field winding wound on interior portions of said boss portions of said first and second magnetic pole cores for supplying magnetic flux to said rotor in a given direction when electric current is applied to said field winding;

    at least a first annular permanent magnetic plate magnetized in a direction of its thickness, and fixed to an exterior side face of a projecting portion of one of said first and second magnetic pole cores for supplying magnetic flux in said given direction; and

    at least a first annular yoke plate, abutting an exterior face of said permanent magnetic plate and attached to a claw-shaped magnetic pole portion of a magnetic pole core to which said permanent magnetic plate is not fixed.

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