What are the benefits of using frequency conversion electric machine

Five, frequency conversion motor to CVT is infinitely adjustable-speed from suspension to the fastest speed, or from the fastest to the end, there is no gear, is increasingly fast or slow, the other all dc frequency conversion motor can through the inverter to control motor speed gear can be divided into many gear motor speed and practical requirements, and communication has the motor of the file number at most only 3 wind speed control was unable to complete the effect of frequency conversion.