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Bonding and coating methods and apparatus for th coils of dynamo-electric machine parts

  • US 5,470,615 A
  • Filed: 03/11/1994
  • Issued: 11/28/1995
  • Est. Priority Date: 03/11/1994
  • Status: Expired due to Fees
First Claim
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1. The method of coating a coil of wire formed on a ferromagnetic core of a dynamo-electric machine part, said coil being formed on said core so that part of the surface of said coil is exposed and so that part of the surface of said core is also exposed, said method comprising the steps of:

  • exposing said dynamo-electric machine part to electrostatically charged resinous powder particles;

    applying different first and second electrical potentials to said coil and said core, respectively, said first electrical potential being selected relative to the electrostatic charge on said particles so that said particles are electrostatically attracted to and coat said exposed surface of said coil, and said second electrical potential being selected relative to the electrostatic charge on said particles to substantially avoid electrostatic retention of said particles on said exposed surface of said core; and

    treating the particles coating said exposed surface of said coil to cause said particles to fuse into a substantially continuous resinous coating on said exposed surface of said coil.

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