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Field system of magnet type D.C. motor having magnetic flux reducing pole pieces

  • US 4,464,595 A
  • Filed: 12/20/1982
  • Issued: 08/07/1984
  • Est. Priority Date: 12/22/1981
  • Status: Expired due to Term
First Claim
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1. A field system of a magnet type D.C. motor comprising:

  • a cylindrical yoke,a plurality of pole pieces each of which is made of a permanent magnet member bonded to an inner peripheral surface of said yoke, each pole piece havinga recess formed therein which extends along a central part thereof, anda plurality of pairs of bent portions provided in said yoke each pair of bent portions in correspondence with each of said recess, and which are protruded inwards of said yoke and held in engagement with both side wall surfaces of said recess through an elastic member.

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