| 摘要 |
PURPOSE:To extend the area of heat radiation and to obtain a small-sized exciting coil operated with a large current by providing a metallic piece forming a part of the exciting coil or a metallic piece adjacent to the exciting coil. CONSTITUTION:Since an exciting coil projecting part 9 is provided and heat is radiated even from under the exciting coil projecting part 9, the rise of temperature can be reduced. In this case, the electric characteristic is scarcely degraded by this exciting coil projecting part 9 because the inside coil shape is equal to conventional that though the exciting coil shape is larger. The exciting coil projecting part 9 is notched radially to reduce furthermore the degradation in electric characteristic. |
