Westinghouse Electric Corporation

Abb Power Td & Company

The United States of America as Represented by the United States

John Sefko

Norman M Pavlik

Richard A Miller

A steel sheet (10) having a stress-relief annealed, structure with a plurality of magnetic domains (12) is made by drilling a plurality of closely spaced, small holes (15) through the entire thickness of the steel sheet, where the drilling is effective to form additional domain walls (17) and subdivide the magnetic domains.

Drilling of steel sheet

A ferromagnetic amorphous metal strip insulated with a coating of glass that is about 0.001 to about 0.02 mils thick.

Insulating ferromagnetic amorphous metal strips

Disclosed is a method of insulating ferromagnetic amorphous metal strip by coating the strip with a composition of about 3 to about 32% of a metal alkoxide having a general formula of M(OR).sub.n, where M is an alkoxide forming metal, R is alkyl, and n is the valence of the M, about 56 to about 96% of a solvent for the metal alkoxide, about 1 to about 12% water, and about 0.001 to about 0.01% of an acid. The coated strip is heated at a temperature above the temperature at which the metal alkoxide hydrolizes and polymerizes and the water and solvent evaporate, and below the temperature at which the amorphous metal crystallizes. Also disclosed is ferromagnetic amorphous metal strip insulated with a coating of glass that is about 0.001 to about 0.02 mils thick.

Method of insulating ferromagnetic amorphous metal continuous strip

A laminated magnetic core characterized by an electromagnetic core having core legs which comprise elongated apertures and edge notches disposed transversely to the longitudinal axis of the legs, such as high reluctance cores with linear magnetization characteristics for high voltage shunt reactors. In one embodiment the apertures include compact bodies of microlaminations for more flexibility and control in adjusting permeability and/or core reluctance.

Laminated grid and web magnetic cores

A magnetically insulated article is described, together with the composition and method of applying the same which is characterized by a curing temperature within the range between about 190.degree. F. and about 350.degree. F.

Low temperature cure interlaminar coating

A magnetically insulated article is described, together with the composition and method of applying the same which is characterized by a curing temperature within the range between about 220.degree. F. and about 350.degree. F.

A method for preparing oxide coated microlaminations characterized by heating microlamination particles at a temperature of about 1375.degree. in an atmosphere having a dew point of 55.degree. to 85.degree. F. and an air-to-natural gas ratio of from about 10.5:1 to about 8:1 for a time sufficient to decarburize the particles to less than 0.005% carbon and to form on the particle surfaces an oxide coating having a thickness of from about 0.01 to about 0.10 mils.

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Monroeville, PA, United States of America

John Sefko