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Electric motor with carbon track commutator

  • US 5,955,812 A
  • Filed: 06/09/1997
  • Issued: 09/21/1999
  • Est. Priority Date: 06/09/1997
  • Status: Expired due to Term
First Claim
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1. An electric motor comprisinga stationary part and a rotating part,said rotating part comprising a shaft having a rotation axis and a commutator subassembly fixed symmetrically about said shaft,said commutator subassembly comprisinga plurality of circumferentially spaced carbon-based material segments surrounding said shaft, each segment having a brush contacting surface,a same plurality of metallic commutators each having a first part secured relative to said shaft,each of said commutators comprising a second part and said second part including a tang member and a wire being electrically and mechanically connected to said tang member,a mounting member made of insulating material for securing said plurality of segments to each other,each of said commutators including a third part that comprises a pawl member formed from and extending from said first part, said pawl member having a free distal end when formed relative to said first part,at least a portion of said pawl member being molded to, and embedded within, and in contact with said one of said segments such that the carbon-based material segment completely surrounds said at least a portion of said pawl member.

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