| 摘要 |
PURPOSE:To improve the thermal and mechanical strength thus to improve the transmission efficiency by forming the barrier wall with cup-shaped enclosed section and two reinforcing sections while forming both reinforcing sections such that the eddy current is suppressed. CONSTITUTION:A cup-shaped barrier wall 6 is formed with a cup-shaped enclosed section 20, first reinforcing section 22 made of metal for improving the axial strengh and second reinforcing section 23 made of metal for improving the radial strength. Both reinforcing sections 22, 23 are formed to suppress eddy current. Consequently, thermal and mechanical strength are improved when compared with such barrier wall as made only of non-metallic material such as resin to reduce eddy current loss considerably when compared with such case as the metallic material is imployed independently or as the reinforcing member for resin resulting in considerable improvement of transmission efficiency. |
