Insulation system for winding of electric rotating machines and

Details Insulation system for winding of electric rotating machines and Insulation system for winding of electric rotating machines and

1979-12-14

1981-12-08

McCamish, Marion

Stock material or miscellaneous articles

Composite

Of epoxy ether

427104, 427116, 427379, 427386, 428377, 428392, 428395, 428396, 428411, 428419, 4284228, 4284231, 4284235, 4284256, 428426, 4284735, 4284744, B05D 512

Patent

active

043048188

ABSTRACT:
An insulation system for winding of electric rotating machines having thermal resistance of class H or more and excellent adhesiveness between a conductor and an insulating layer and resistance to thermal stress can be produced by wrapping a plurality of layers of an insulating tape or sheet having thermal resistance of class H or more around a winding conductor, impregnating the thus treated winding conductor with a solventless varnish consisting essentially of 1 equivalent of an epoxy compound containing at least two vicinal epoxy groups, more than one equivalent of an organic polyisocyanate, and then heating the inpregnated winding conductor at a temperature above 60.degree. C. for a time sufficient to form and cure a resin containing as recurring units at least two isocyanurate rings directly bonded to one another through the residue of the polyisocyanate and two oxazolidone rings directly bonded to each other through the residue of the polyepoxide in the presence of 0.01-10% by weight of a catalyst which forms the isocyanurate rings and oxazolidone rings based on the total amount of the polyepoxide and polyisocyanate.

REFERENCES:
patent: 3793236 (1974-02-01), Ashida

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