Asynchronous frequency conversion motor is derived by ordinary induction motor, to adapt to the characteristics of the inverter output power, the motor rotor groove, insulation technology, electromagnetic design check, made a lot of changes, especially the ventilation of the motor cooling, it is in the general case plus an independent forced cooling fan, to adapt the cooling efficiency when the motor is running at low speed and to reduce the motor running at high speed when the wind abrasion. The output of the inverter is generally the output frequency of the power, speed output shows the calculated value of the number of poles of the motor and the power supply output frequency, there is a big difference between the actual speed of the induction motor the general asynchronous variable frequency motor, induction motor turn error rate is decided by the motor manufacturing process, discrete, and load changes directly affect the speed of the motor to precisely control the speed of the motor can only use the optical encoder for closed-loop control, precision speed when the stand-alone control is determined by the number of pulses of the encoder, when the multi-machine control multiple motor speed is not strictly synchronous. This asynchronous motor innate.

    Lined with permanent magnet synchronous frequency conversion motor rotor, motor instantly start after, to the normal operation of the motor, the stator rotating magnetic field driven set with permanent magnet rotor synchronous operation, the motor speed according to the number of poles of the motor a strict correspondence between the speed is independent of the load and other factors influence the frequency of input power and motor. The same synchronization frequency conversion motor attached to a stand-alone forced cooling fan, to adapt to the motor at low speed high

Efficiency heat dissipation and reduce the motor running at high speed wind abrasion. Strict correspondence between the motor speed and power frequency, making the motor speed accuracy depends on the accuracy of the inverter output power frequency, the control system is simple, more than one motor speed control multiple motors on one inverter, does not require expensive optical encoder for closed-loop control.