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Electric motor

  • US 20050140235A1
  • Filed: 12/03/2004
  • Published: 06/30/2005
  • Est. Priority Date: 12/26/2003
  • Status: Active Grant
First Claim
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1. An electric motor comprising:

  • a stator with a plurality of coils wound around a ring-shaped iron core; and

    a rotor rotatably disposed inside the stator;

    the rotor comprising;

    a rotor shaft;

    a yoke integrally mounted on the rotor shaft;

    a plurality of magnet holes formed at equal pitches near a periphery of the yoke; and

    a plurality of plate-like permanent magnets disposed in the magnet holes, respectively;

    wherein the yoke has a plurality of air holes, provided between the rotor shaft and the permanent magnets, for accelerating heat release of the rotor.

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