The working principle of the frequency converter is to control the main circuit through the control circuit. The rectifier in the main circuit converts alternating current into direct current, the DC intermediate circuit smoothes the direct current, and the inverter finally converts the direct current into alternating current of the required frequency and voltage. Some frequency converters also add CPU and other components to the circuit to perform necessary torque calculation.


Frequency converter is an electrical equipment that converts power frequency power supply into AC power supply of any frequency and voltage. The use of frequency converter is mainly to adjust the power of motor and realize variable speed operation of motor. The composition of the frequency converter mainly includes control circuit and main circuit. The main circuit also includes rectifier, inverter and other components. The frequency power supply of the frequency converter is generally 50Hz or 60Hz. Whether in the field of household or production, the frequency and voltage of the frequency power supply are constant. The motor working with power frequency power supply may cause power drop during speed regulation, and through the adjustment of frequency converter, the motor can reduce power loss during speed regulation.