| 摘要 |
PURPOSE:To prevent cast resin insulated film from insulation deterioration by a method wherein a conductive ring is provided connecting electrically covering in peripheral direction at an end section of each divided conductive layer for shielding an inner electric field possessed a discontinuity section and electric convergence is alleviated by the conductive ring. CONSTITUTION:An FRP insulated layer 2 is provided to the outside periphery of a loop-state coil conductor 1, and to the outside periphery thereof, a conductive layer 3 for shielding electric field, which possesses one or more discontinuity section (a) in the coil loop direction and also connects electrically with coil conductor 1 or a lead-out-wire thereof, is provided, and to an outside periphery of the conductive layer 3, a cast resin insulated layer 5 is provided, additionally to an outside peripheral surface a conductive ground layer 6 is provided. A conductive ring 7 is provided to each end section 3a, 3b of a divided conductive layer 3A, 3B dealing with each other inserting the discontinuity section (a) of the conductive layer 3 for shielding electric field. Since convergence of electric line of force P to be converged to each end section 3a, 3b is relaxed steeply owing to existance of the ring 7, which wires a circle section conductive wire 7a spirally, thus prevents electric field convergence, insulation deterioration of the resin insulated layer 5 can be prevented effectively. |
