| 摘要 |
PURPOSE:To improve the fatigue strength of a slot bottom occurred due to a stress concentration by hardening the skin of an electromagnetic steel material of a rotor. CONSTITUTION:A rotor 1 is composed of an electromagnetic steel material, and a rotor slot 2 is formed on the rotor 1. The inner peripheral surfaces of the slot 2 and a CL ring 3 are, for example, salt nitrided. Then, a rotor bar 2 and the ring 3 are cast, and a load side shaft 4 and an opposite load side shaft 5 are shrink-fitted. An automatic tool exchanger is, for example, contained in a space provided in the center of the rotor 1 and the shafts 4, 5. |
