Method of making electrical coils for dynamo-electric machines h

Details Method of making electrical coils for dynamo-electric machines h Method of making electrical coils for dynamo-electric machines h

1976-01-13

1977-08-02

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29605, 174120SR, 174121SR, 310208, 310213, H02K 1504, H01F 4112

Patent

active

040387410

ABSTRACT:
A composite tape insulation for use in winding onto electrical conductors to be further processed for installation in an electrical machine comprises an internal insulation structure having a layer of glass cloth or polyester fleece and a layer of fine mica impregnated with a cured synthetic resin such as an epoxide resin, and outer facing layers of a synthetic material such as a polycarbonate resin bonded to opposite sides of the internal insulation structure by the impregnating resin. The composite tape insulation is made by passing the internal layer structure through a bath of the impregnating resin, thereafter applying the outer facing layers, heating the resulting composite structure so as to cure the impregnating resin to an intermediate B state, winding the composite structure onto the bare electrical conductor with an overlap of the order of 50%, cutting the conductor into lengths which are then shaped to the desired configuration, and then final pressing and heating the insulated and shaped conductor lengths to establish a final bond of all components and conversion of the impregnating resin to its C state.

REFERENCES:
patent: 2656290 (1953-10-01), Berberich et al.
patent: 2707204 (1955-04-01), Richardson et al.
patent: 2917570 (1959-12-01), Wolff et al.
patent: 3556925 (1971-01-01), Mertens
patent: 3695984 (1972-10-01), Rogers, Jr.

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