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Armature having a flat disk type commutator

  • US 5,245,240 A
  • Filed: 07/16/1992
  • Issued: 09/14/1993
  • Est. Priority Date: 07/17/1991
  • Status: Expired due to Term
First Claim
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1. An armature having a flat disk type commutator, comprising:

  • a plurality of segments each of which includes an electrically conductive base metal having an upper and lower substantially flat surface and extending radially from a central axis;

    each of said segments being circumaxially disposed about said central axis and electrically insulated from one another, said electrically conductive base metal being solidly secured to a boss portion, said boss portion being formed from synthetic resin and integrally with each of said base metals, said boss portion further having a circular outer peripheral surface, said base metal further comprising a riser defining a main electrode portion and an auxiliary electrode portion, said main electrode portion and said auxiliary electrode portion being formed integrally on said base metal and each having outwardly facing surfaces, said main and auxiliary electrode portions being disposed side-by-side one another circumferentially and along said circular outer peripheral surface of said boss portion;

    each of said segments further comprising a protective member bonded to the upper substantially flat surface of said base metal by means of an electrically conductive and hot-melt bonding material, said protective member having a shape and size substantially equal to the upper substantially flat surface of said base metal;

    said riser forming a support and guide for welding a wire end of an armature coil thereto during a fusing treatment wherein a main electrode is brought into contact with said main electrode portion of said base metal and an auxiliary electrode is brought into contact with said auxiliary electrode portion of said base metal so that during the fusing treatment electrical current flows through the main electrode to the main electrode portion circumferentially through the base metal through the auxiliary electrode portion to the auxiliary electrode without passing through the bonding material during the fusing treatment.

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