1 to PIM as the core, the whole and high reliability; 2, the high output torque, starting torque, low speed up to 150%; 3, with a variety of control, the control requirements for different occasions, the power range: 0.4 KW --- 2.2KW; 4, the carrier frequency of up to 16K, with the characteristics of a very quiet; 5, with a small volume of \ functional characteristics of strong, built-in PID and simple PLC; 6, adaptive power grid, voltage up and down fluctuations of up to 15%, in particular, to adapt to network countries and regions of poor quality; 7, with good communication interface, easy to form centralized control system; 8, panel potentiometer for easy adjustment frequency;