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Air-core armature

  • US 3,944,857 A
  • Filed: 09/19/1974
  • Issued: 03/16/1976
  • Est. Priority Date: 02/28/1974
  • Status: Expired due to Term
First Claim
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1. An air-core armature for electrodynamic machines, comprising, in combination, an elongated insulating strip rolled up to form a spiral structure composed of a plurality of radially successive layers;

  • and an armature winding comprised of at least one armature coil, said armature coil being comprised of a plurality of electrically interconnected component coils, each of said component coils being formed of electrically interconnected conductor sections printed on both sides of said strip, said component coils being located on different respective ones of said radially successive layers but occupying substantially the same circumferential sector of said spiral structure and accordingly being substantially juxtaposed in direction radially of said spiral structure, wherein each of said component coils has one end and an other end, and is comprised at said other end of a circumferentially extending electrically conductive portion extending in the circumferential direction opposite to the direction from said one end to said other end, said circumferentially extending electrically conductive portions being so disposed as to compensate for the difference in circumferential length of different ones of said radially successive layers.

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