| 摘要 |
PURPOSE:To increase the natural oscillation frequency by a construction wherein a clamping plate has a larger thickness at its part not facing end frames than at its part facing the end frames, and a bottom plate is fixed to the end frame at near its part facing the clamping plate. CONSTITUTION:The upper and lower parts of a laminated core 1 are clamped by end frames 2, 7 through bottom plates 5, 14, respectively, and the central part of the core 1 is clamped and fixed by clamping plates 12 using bolts 10. The clamping plate 12 is so formed that a thickness of its part not facing the end frames 2, 7 is larger that of its part facing them within such a range that the clamping plate can be inserted into between the core 1 and a coil 11. A seating recess 13 with a depth not less than thickness of nuts is formed in the clamping plate 12 at its part where the bolts is clamped. The bottom plates 5, 14 are welded to the end frames 2, 7. By so doing, it becomes possible to increase the natural oscillation frequency of the core part and improve reliability. |
