Method of curing vacuum pressure impregnated coils
AssigneeGeneral Electric Company
InventorGeza Gruenwald
Life of this patent
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Abstract
After vacuum pressure impregnating an insulated coil with liquid polyester resin the outer surface of the combination is treated to cause a quick low temperature gellation of an outer shell of the resin to thereby encapsulate the remaining liquid portion. A subsequent high temperature cure is imposed for a relatively long period of time to solidify the liquid inner portion and to fully cure the resin throughout the insulation.
Claims8
A method of insulating an electro-magnetic coil comprising the steps of:
- a. applying a permeable electrical insulating material to the coil;
- b. applying a first chemical catalyst throughout said material, said chemical catalyst being reactive with a resin at elevated temperatures but relatively unreactive therewith at room temperatures;
- c. vacuum pressure impregnating said material throughout with a liquid, chemically reactive, cross linkable resin;
- d. thereafter inducing a quick cure to solidify said resin on the surface of said impregnated material, thereby encapsulating the liquid resin which is in the bulk of said material;
- and
- e. subsequently exposing said material to elevated temperatures to cure said liquid resin and thereby form a solid structure throughout said material.
A process for treating the surface of an insulated coil impregnated with a polyester resin to prevent the resin from draining out during a subsequent heating process comprising:
- exposing the surface of the coil to an accelerator agent selected from the group consisting of peroxides and isocyanates.
Dependencies are inferred from the claim text.