It is not possible to directly design the motor as a hollow shaft, because when the motor rotates, the centrifugal force is very large. If the shaft is hollow, it will be easily broken, especially at the coupling position. Broken. I have repaired a 110KW Class 6 motor, and the rotor was suddenly broken at the coupling position. Think about what would happen if it were hollow
There is a motor shaft with a hollow design. , but only a small part of it is a wound rotor motor, also called a slip ring motor. The hollow shaft is used to thread the threads of the rotor, and these motors are all 30KW. Mainly used to drive winches and the like.