Rotating electric machine

摘要

A stator coil for a electric rotating machine which does not deteriorate impregnation characteristic of an ground wall insulation of stator coil with resin, which maintains a releasing characteristic between the ground wall insulation of stator coil and a slot of stator core, which is able to prevent occurrence of a surface corona and which exhibits excellent characteristics for a log time. The stator coil of the electric rotating machine has a conductor covered with an insulating layer to the ground and a surface-corona preventive layer, the stator coil being accommodated in the slot of stator core and, together with the stator core, impregnated with thermosetting impregnation resin so as to be cured so that the stator coil is integrated with the stator core. The surface-corona preventive layer is formed by winding a semiconductive tape and a composite tape, which has a fluorine unbonding material layer formed on either side of a semiconductive tape and which has a width smaller than the semiconductive tape, such that the slot of stator core and the insulating layer to the ground are made contact with a semiconductive surface of the tape and the unbonding material layer is disposed between the semiconductive tape portions so as to form a gap in a widthwise direction of the unbonding material layer. <IMAGE>