| 摘要 |
PURPOSE:To prevent an eddy current loss due to a leakage flux and to increase the electrical insulation strength when a metallic sheet and an insulating sheet are laminated and wound around an iron core and a cooling duct is arranged among them for cooling the windings by flowing the cooling medium through it by composing a connection screw part of an insulation pipe located between the duct and a cooling medium containing pipe out of an insulator of ceramic inorganic composition. CONSTITUTION:A metallic sheet 2 and an insulating sheet 3 are laminated and wound around an iron core 1 to compose a low-voltage winding 4 and a high- voltage winding 5. At this time, a cooling duct 6 parallel to the iron core 1 is arranged among the respective layers of the windings 4 and 5 so as to flow a cooling medium 15 from a cooling medium tank 14 in it through an insulation pipe 11. The connection screw part of the duct 6 and the pipe is composed as follows. Between a coupler 19 of the cooling duct 6 and the pipe 11, a box nut 16 and a washer 17 both of which are ceramic made of AlN or the like and an O-ring 18 which is not ceramic are interposed thereby connecting the duct 6 and the pipe 11. |
