Integral coaxial commutation and rotor magnets and apparatus and method for making same

  • US 4,494,028 A
  • Filed: 09/30/1982
  • Issued: 01/15/1985
  • Est. Priority Date: 09/30/1982
  • Status: Expired due to Term
First Claim
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1. An integral annualr field and commutation magnet for a brushless DC motor formed on a single piece of permanently magnetized material and including a first annular field magnet portion at a first location and a second annular commutation magnet portion at a second location axially displaced from the first location, said field magnet portion having magnetized and unmagnetized sectors, said unmagnetized sectors being substantially unmagnetized portions of the magnetic material of said piece, being adjacent to magnetized sectors of the field magnet portion and integral therewith and having a substantial angular length.

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