| 摘要 |
PURPOSE:To prevent the corona shield layer from peeling off by setting the coefficient of thermal expansion of the corona shield layer provided on the surface of the mold layer to nearly the same as that of the mold layer. CONSTITUTION:On the outside circumference of a coil conductor 2, around which an insulating basic material 3 composed of a phased insulated layer 3a and an interlinear insulated layer 3b are wound and and shaped, an epoxy resin mold layer 4a is provided, and on the surface of this mold layer 4a a corona shield layer 5b is provided. By setting the coefficient of thermal expansion of the corona shield layer 5b to nearly the same as that of the mold layer 4a, the corona shield layer 5b becomes hard to be peeled off.
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