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Method of manufacturing armature coil

  • US 10,644,556 B2
  • Filed: 06/30/2017
  • Issued: 05/05/2020
  • Est. Priority Date: 04/26/2013
  • Status: Active Grant
First Claim
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1. A method of manufacturing an armature coil, comprising:

  • arranging a plurality of coil conductors on a lower metal die having a taper-shaped groove substantially the same as a slot which is wound with the plurality of coil conductors of said armature coil, the tapered-shaped groove is formed in a trapezoidal shape which gets narrower in width toward a radially inner side of the tapered-shaped groove;

    pressing the plurality of coil conductors arranged in the tapered-shaped groove of said lower metal die by an upper metal die having a rod-shaped end portion slightly narrower than the width of the tapered-shaped groove;

    forming the plurality of coil conductors more flattened toward said coil conductor arranged at an end of the tapered-shaped groove by being pressed to a predetermined position by the rod-shaped end portion of said upper metal die, forming the plurality of coil conductors each with an aspect ratio smaller toward said coil conductor near an opening portion at an upper end of the tapered-shaped groove, and forming the plurality of coil conductors such that a surface of one of the coil conductors abutting another one of the coil conductors is formed in a convex shape and a surface of the another one of the coil conductors abutting the one of the coil conductors is formed in a concave shape; and

    removing the plurality of coil conductors formed in the convex shape and the concave shape from said lower metal die.

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