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Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion and methods of making same

  • US 7,211,920 B2
  • Filed: 02/18/2005
  • Issued: 05/01/2007
  • Est. Priority Date: 09/05/2003
  • Status: Expired due to Fees
First Claim
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1. An electric motor, comprising:

  • a. a stator having a back iron portion and at least two pole portions on which field coils are disposed, the pole portions having an axial length less than an axial length of back iron portion;

    b. the field coils formed so that ends of the field coils don'"'"'t extend beyond axial ends of the back iron portion; and

    c. an armature disposed in the stator.

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