Metal working – Method of mechanical manufacture – Electrical device making
Patent
1995-02-14
1997-06-10
Vo, Peter
Metal working
Method of mechanical manufacture
Electrical device making
295272, 29620, 174119C, 174122C, 310208, 310 45, 427116, H01F 506, H01B 1308, H01B 1316, H01B 302
Patent
active
056364342
ABSTRACT:
A high temperature electrical insulation system is provided by forming a winding in an electrical device from a conductor that is pre-coated with a first layer of at least partially cured inorganic material. A second layer of inorganic material is applied, either during or just prior to forming the winding, over the first layer in order to seal any cracks in the first layer. The resultant electrical insulative coating is cured following the forming process, essentially at room temperature. The insulation system provided is thus totally inorganic, and its manufacture does not require the use of organics, or heating to high temperatures to cure the coating or to cause pyrolysis and/or volatilization of organic elements, as did prior electrical insulation systems. Furthermore, because no organics are utilized in either the manufacture or operation of the insulation system, there is no residual carbon in the resultant coating. The problem of reduced dielectric strength--caused by residual carbon--which plagued some prior attempts to develop polymer based high temperature insulation systems, is thus eliminated. By utilizing only inorganic materials, the insulation system provided is capable of operating satisfactorily for extended periods of time at temperatures in excessof 500.degree. F.
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Hufstedler Glenn
Jones Ted L.
Okey Dave W.
Rhodes Richard
Crowe Lawrence E.
Sundstrand Corporation
Vo Peter
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