Three-phase asynchronous motor is to change the stator winding wiring mode to change the number of stator poles of the cage motor to achieve the purpose of speed regulation. The characteristics are as follows:

　　1, has a hard mechanical characteristics, excellent stability;

　　2, no slip loss, high power;

　　3. Simple wiring, convenient control and low price;

　　4, stepless speed regulation, the level difference is large, can not get smooth speed regulation;

　　5, can be used in cooperation with the pressure regulation speed regulation, electromagnetic differential clutch, get a higher power smooth speed regulation characteristics.