The working principle of the
frequency converter is to control the main circuit through the control circuit. The rectifier in the main circuit converts the alternating current into direct current, the intermediate circuit of the direct current smoothes and filters the direct current, and the
frequency converter finally converts the direct current into alternating current of the required frequency and voltage. .
The DC voltage rectified by the rectifier includes a pulsating voltage six times the frequency of the power supply, and the pulsating current generated by the frequency converter also fluctuates the DC voltage. Some
frequency converters also add CPU and other components to the circuit to perform necessary torque calculations.
