Electromagnetic equipment
AssigneeKabushiki Kaisha Toshiba
InventorsTetsushi Okamoto, Yoshihiro Ito
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Abstract
An electromagnetic equipment such as dynamoelectric machine includes an electromagnetic coil formed by winding an insulated wire. The insulated wire is made of a bare conductor having, on its surface, two layers of an insulating coating composed of a varnish and a low-resistance conductive coating composed of a heat resisting varnish containing a conductive oxide. A coil formed of the insulated wire is applied to the whole electromagnetic coil or a coil part near a power supply terminal.
Claims10
An electromagnetic equipment comprising an electromagnetic coil formed by winding an insulated wire comprising a bare conductor having two layers of an insulating coating formed by applying a varnish to a surface thereof and baking the varnish and an outer coating formed by applying a coating paint to a surface of the insulating coating and baking the coating paint, the outer coating having a lower resistivity than the insulating coating, the coating paint comprising a mixture of a varnish and an additive containing triiron tetraoxide or talc.
A transformer comprising an electromagnetic coil formed by winding an insulated wire comprising a bare conductor having two layers of an insulating coating formed by applying a varnish to a surface thereof and baking the varnish and an outer coating formed by applying a coating paint to a surface of the insulating coating and baking the coating paint, the outer coating having a lower resistivity than the insulating coating, the coating paint comprising a mixture of a varnish and an additive containing triiron tetraoxide or talc, the electromagnetic coil being enclosed in a resin by casting and including a plurality of block coils located away from each other in the resin and electrically connected in series to each other, wherein the outer coating is formed at least on surfaces of the insulating wires forming the block coils located at respective sides of a beginning and a termination of the coils.
Dependencies are inferred from the claim text.