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Ceramic electrical insulation for electrical coils, transformers, and magnets

United States Patent

June 18, 2002
View the Complete Patent at the US Patent & Trademark Office
A high temperature electrical insulation is described, which is suitable for electrical windings for any number of applications. The inventive insulation comprises a cured preceramic polymer resin, which is preferably a polysiloxane resin. A method for insulating electrical windings, which are intended for use in high temperature environments, such as superconductors and the like, advantageously comprises the steps of, first, applying a preceramic polymer layer to a conductor core, to function as an insulation layer, and second, curing the preceramic polymer layer. The conductor core preferably comprises a metallic wire, which may be wound into a coil. In the preferred method, the applying step comprises a step of wrapping the conductor core with a sleeve or tape of glass or ceramic fabric which has been impregnated by a preceramic polymer resin. The inventive insulation system allows conducting coils and magnets to be fabricated using existing processing equipment, and maximizes the mechanical and thermal performance at both elevated and cryogenic temperatures. It also permits co-processing of the wire and the insulation to increase production efficiencies and reduce overall costs, while still remarkably enhancing performance.
Rice; John A. (Longmont, CO), Hazelton; Craig S. (Lafayette, CO), Fabian; Paul E. (Broomfield, CO)
Composite Technology Development, Inc. (Lafayette, CO)
09/ 390,379
September 3, 1999
This invention was made with Government support under Grant DE-FG03-96ER82147 awarded by the Department of Energy. The Government has certain rights in this invention