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Motor

  • US 20060125334A1
  • Filed: 12/12/2005
  • Published: 06/15/2006
  • Est. Priority Date: 12/13/2004
  • Status: Active Grant
First Claim
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1. An electric motor comprising:

  • a static part includes a stator;

    a field magnet having a cylindrical shape;

    a rotor part having the field magnet for generating a torque around a central axis with respect to the stator;

    a bearing part for supporting the rotor part rotatably with respect to the static portion around the central axis;

    a sensor magnet that is a substantially ring-like rare earth anisotropic magnet and magnetized in multiple poles, the sensor magnet secured on the rotor part and arranged with the field magnet coaxially; and

    a sensor disposed so as to oppose the sensor magnet, for detecting the position of the sensor magnet.

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