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Electronically commutated motor and method of making same

  • US 4,005,347 A
  • Filed: 06/24/1974
  • Issued: 01/25/1977
  • Est. Priority Date: 06/24/1974
  • Status: Expired due to Term
First Claim
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1. A brushless DC motor having a stationary armature comprising an armature core and a plurality of winding turns disposed on said armature core, a permanent magnet rotor adapted to rotate about a longitudinal axis in response to magnetic fields established by said armature, means for developing position control signals indicative of the rotational position of said rotor and operative for causing commutation of each of the windings at an advancement angle before the rotor rotates to a position such that the center of a magnetic pole thereof of a first polarity is displaced 135 electrical degrees from the center of a magnetic pole of a polarity opposite to said first polarity and established by the winding being commutated.

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