Bonding and coating methods and apparatus for th coils of dynamo-electric machine parts
First Claim
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.
1 Assignment
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Accused Products
Abstract
The coils on dynamo-electric machine parts (such as electric motor armatures or stators) are stabilized and coated by electrostatically coating them with resin powder, and then fusing the powder into a continuous resin coating on the coils. For example, the powder may be fused by heat generated by briefly passing a relatively large electrical current through the coils. If desired, the coils may be formed with wire which has an outer layer of bonding material. Activation of the bonding material, which may occur simultaneously with fusing of the resin powder, bonds adjacent coil wires together.
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Citations
18 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus for 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 apparatus comprising:
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means for exposing said dynamo-electric machine part to electrostatically charged resinous powder particles; means for 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 means for 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification