Speaking of the working principle of the frequency converter, it is actually a kind of equipment to control the motor power by changing the frequency of the motor power supply. Its main components include: rectifier, filter, inverter, driving unit, braking unit, microprocessing unit, detection unit and so on. The main function of installing frequency converter is energy saving and speed regulation. To achieve this goal, it is necessary to change the output voltage and output frequency through the IGBT on and off, and provide power for the motor according to the real needs of the motor. In addition, the frequency converter has many protective functions, such as overcurrent, overvoltage, overload protection and so on.