Motor rotor repair

My unit has a TV-5 electric hoist, the motor is T756 type squirrel cage, the power is 7.5KW. When in use, the rotor shaft of the motor is broken at the root of the spline. In order to remove the broken shaft, the shaft is unloaded on the hydraulic machine. Because the shaft and the core are too tightly fitted, the top pad is unreasonable at the same time (Fig. 1), so that the casting is made. The end of the aluminum is crushed and the silicon steel sheet is deformed from the seam. Repair method: (1) Take out the shaft with a large drill bit on the lathe and remove it. (2) Using a stud bolt mandrel and pressing plates at both ends, the silicon steel sheet is pressed tightly so as not to be loose (Fig. 2).

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