| 摘要 |
PURPOSE:To decrease heat loss caused by heat conduction without decrease in allowable continuous current of a conductor by forming an intermediate conducting part with a low heat conductive material, and forming inside and outside conducting parts with a high heat conductive material. CONSTITUTION:An intermediate conducting part 13 facing a heat insulating case 1 is formed with a low heat conductive material such as iron and nickel. An inside conducting part 12 and an outside conducting part 14 are formed with high heat conductive material such as copper and aluminium. Since only the intermediate conducting part 13 is formed with a low heat conductive material, heat in the heat insulating case 1 is difficult to conduct to a conductor 6, and heat loss is decreased. Although electric conductivity is decreased compared with use of single material, allowable continuous current does not decrease. |
