Variable frequency drives are mainly composed of rectification (AC to DC), filtering, inversion (DC to AC), braking units, driving units, detection units, and micro-processing units. They adjust the output power voltage and frequency by switching the internal IGBTs, providing the required power voltage based on the actual motor needs, thereby achieving energy saving and speed control. Additionally, variable frequency drives offer numerous protection functions, such as overcurrent, overvoltage, and overload protection. With the continuous increase in industrial automation, variable frequency drives have found extensive applications.