Remove brushes and short the ring together with a copper link in case of a slip ring motor (wound rotor).
The cascade speed regulation for AC motor can effectively and economically utilize the slip power of wound rotor asynchronous moter to regulate the speed.
Based on practice, the reasons of large and medium-sized high voltage wound rotor three-phase asynchronous motor rotor failure were expounded, and viable approach was designed.
three phase wound rotor type induction motor