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Laminated back iron structrue for increased motor efficiency

  • US 5,757,101 A
  • Filed: 08/08/1996
  • Issued: 05/26/1998
  • Est. Priority Date: 06/06/1995
  • Status: Expired due to Term
First Claim
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1. An electric motor including a stator with a laminated core and commutated windings, a rotor assembly, and bearing means supporting said rotor for rotation relative to said stator comprising:

  • a bobbin forming a pair of said rotor assembly and having a central cylindrical portion comprising an inside and an outside;

    a permanent magnet secured on the inside of said bobbin central cylindrical portion facing the stator; and

    a laminated back iron mounted on the outside of said bobbin central cylindrical portion.

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