| 摘要 |
PURPOSE:To lower an eddy current loss without changing occupation rate of insulated winding by obtaining a conductor by twisting a plurality of fine rare wire and forming copper oxide film at the surface of each fine rare wire and constituting an insulated winding by twisting a plurality of said conductor covered with insulator. CONSTITUTION:A conductor 13 is formed by concentrically twisting 7 to 61 copper fine rare wires 12 in diameter of 0.2-1mm.phi. This conductor 13 is subjected to the oxidation processing and a film 14 of cupric oxide is formed on the surface of each fine rare wire 12. An insulated film 15 consisting of enamel, plastic and paper, etc. is provided to the external circumference of the conductor 13. About 19 to 91 rare wires 10 thus manufactured and concentrically twisted and these are compressed and shaped to the form having desired section, for example, the square form. The desired insulated winding 11 can be manufactured by providing an insulated layer 16 consisting of enamel, plastic or paper, etc., at the external circumference. |
