| 摘要 |
PURPOSE:To keep a sufficient insulation distance by a method wherein two cases with butting surfaces are provided and those butting surfaces do not overlap with each other when one of the cases is reversed against a center line and each receptacle of each case can be inserted into the receptacle of each other by coupling those two cases. CONSTITUTION:Protruded parts 6 for keeping an insulation distance between a winding and a winding re provided to a core case 5 for insulation. The case 5 is formed in such a manner that, when it is reversed against the B-B line, a circular arc 7a and a circular arc 7b do not overlap and a circular arc 8a and a circular arc 8b do not overlap either. The height of a junction part 9 of the circular arcs is not more than half of the depth of the case. When one of such two cases 5 is reversed and the two cases are butted together, they can be coupled. When two cases 5 are coupled, a receptacle 10 and a receptacle 11 can be inserted into the receptacle 11 and the receptacle 10 respectively. The core is housed in a space formed by the receptacle 10 and the receptacle 11. The coil-winding is applied on the case. |
