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DC motor having improved contact between commutator and armature

  • US 4,933,587 A
  • Filed: 10/11/1988
  • Issued: 06/12/1990
  • Est. Priority Date: 02/12/1987
  • Status: Expired due to Term
First Claim
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1. A d.c. motor for an engine starter comprising:

  • a rotary shaft;

    an aluminum armature coil disposed on said rotary shaft for rotation therewith;

    a commutator disposed on said rotary shaft for rotation therewith and having a plurality of copper commutator segments, each of said commutator segments including a main body portion having a sliding contact surface and a connecting portion having an aluminum connecting surface electrically and mechanically integral with said connecting portion, said connecting portion being provided at a first end of each of said commutator segments;

    said aluminum armature coil being electrically and mechanically connected to said aluminum connecting surface of said connecting portion of each of said commutator segments to form an electrical and mechanical connection therebetween.

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