Method of making electrical coils having improved strength and o

Details Method of making electrical coils having improved strength and o Method of making electrical coils having improved strength and o

1974-11-26

1976-01-27

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

336 60, 336205, 336206, 427 14, 427 21, 427121, 427197, H01F 4106

Patent

active

039343324

ABSTRACT:
A porous, electrical insulating adhesive substrate is made, by uniformly coating a flexible, porous sheet material with adhesive resin particles having an average particle size of between about 37 to 420 microns, the adhesive coating covering from about 5 to 50 percent of the sheet material area in a non-patterned random distribution, and then heating the coated sheet material between about 85.degree. to 250.degree.C, forming a discontinuous 0.25 to 7 mil dry coating of discrete adhesive particles having substantially rounded cross sections bonded to the sheet material, said adhesive coating covering from about 5 to 50 percent of the sheet material area in a non-patterned random distribution; the coated sheet may then be inserted as oil permeable layer insulation between high voltage windings and low voltage windings and between layers of high and low voltage windings in a wound coil assembly, after which the assembly can be heated at a temperature and for a time effective to securely bond the winding layers together, to provide a porous, oil permeable, bonded transformer coil assembly.

REFERENCES:
patent: 3203823 (1965-08-01), Grimes
patent: 3246271 (1966-04-01), Ford

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