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Permanent magnet motor

  • US 20050264122A1
  • Filed: 05/20/2005
  • Published: 12/01/2005
  • Est. Priority Date: 05/26/2004
  • Status: Active Grant
First Claim
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1. A permanent magnet motor consisting of a rotor, which is supported on a rotating shaft and has twelve permanent magnets arranged at fixed intervals in the circumferential direction in the peripheral edge portion thereof, and a stator, which is disposed around the rotor with a gap being provided with respect to the rotor and has nine magnetic poles, each having a coil wound thereon, arranged at fixed intervals in the circumferential direction so as to face towards the outer peripheral surface of the rotor, wherein a value obtained by dividing the radius of the rotor by the radius of curvature of a permanent magnet surface facing towards the stator is set at a value such as to decrease cogging torque.

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