High performance : The rotor uses rare earth PM material. High magnetic field tensity, big starting torque, small starting current, and wide speed range;
Small size and light weight : Its frame size is one to two frame sizes smaller than that of AC asynchronous motor of same HP;
Simple and reliable control system : It uses open loop control, which reduces the possible area of fault and the cost. The full automatic control system consisting of inverter and computer has better performance than other types of traditional variable speed motor;
High efficient and high power factor, effective in saving energy :it is 5% to 12% more efficient than asynchronous motor of same HP. As the motor does not need the exciting current, the power factor is close to1;
Long durability : As a result of reduced current and less heating of motor;
Compatibility : It has same frame structure with AC asynchronous motor and can be used to substitute AC asynchronous motor;
Wide applicability : It can be used in various tough conditions. It can even be used in the place where running at low speed for a long time or frequent starting is necessary
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