US 7,120,993 B2Granted

Method of manufacturing insulated coil

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsShigeyuki Yamamoto, Wataru Bito, Toshio Isooka, Koichi Goshima

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Abstract

On a surface of a glass cloth adhered a mica layer sheet, a mixture of inorganic particles having a thermal conductivity of at least 5 W/mK, a resin, and a solvent is applied to form a layer of the mixture of the inorganic particles, the resin, and the solvent; the layer of the mixture is reduced in thickness using a doctor blade, followed by pressurizing to form a high thermally conducting layer; the mica layer sheet on which the high thermally conducting layer is disposed is cut to obtain a mica insulating tape; and the mica insulation tape is wound around a coil conductor. As a result, an insulated coil that is excellent in the voltage endurance characteristics and has a high thermal conductivity is manufactured.

Claims4

Dependent claims

A method of manufacturing an insulated coil comprising:

stacking a mica layer sheet to which a resin is adhered and glass cloth to which a resin is adhered, followed by pressurizing to obtain the mica layer sheet to which the glass cloth is adhered;
applying a coating, to a surface of the glass cloth adhered to the mica layer sheet, of a mixture of inorganic particles having a thermal conductivity of at least 5 W/mK, a resins, and a solvent to form a layer of the mixture of the inorganic particles, the resin, and the solvent;
reducing thickness of the layer of the mixture with a doctor blade, followed by pressurizing;
volatilizing the solvent in the layer of the mixture to leave a thermally conductive layer containing the inorganic particles on the surface of the glass cloth adhered to the mica layer sheet;
cutting the mica layer sheet to which the thermally conductive layer is attached to obtain a mica insulating tape with the thermally conductive layer on the surface of the glass cloth;
and
winding the mica insulating tape around a coil conductor.

4 more elements

Dependencies are inferred from the claim text.