| 摘要 |
PROBLEM TO BE SOLVED: To eliminate defects such as peels and cracks between an insulated coil surface and a stator iron core slot by the action of thermal expansion, electromagnetic vibration or the like, even if a corona preventive layer applied to the surface of the insulated coil and having low resistance undergoes heat deterioration caused by heat generated on a coil conductor while a dynamo-electric machine is running, and have excellent heat resistance and corona resistance. SOLUTION: The insulated coil 2 in which an impregnated mica sheet or a mica tape 5 is wound several times around a strand conductor 1 formed by binding a plurality of strands with insulated covering to form an insulated layer 5 is stored in and is connected to the stator iron core 3, and is immersed in thermosetting resin along with stator iron core 3 for vacuum air-pressed impregnation and heat hardening to from the stator iron core coil of the dynamo-electric machine. A sheet or a tape material, which is conductive and resistant to high heat and consists of inorganic carbon, is wound around the outer periphery of the insulated layer 5 of the insulated coil 2 to form corona protective layers 6, 7.
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