The inverter is the application of inverter technology and microelectronic technology, by changing the motor means to control the power supply frequency AC motor speed to achieve processing requirements. Inverter is mainly by the rectifier (AC to DC), filter, inverter (DC-AC), braking unit, drive unit, a detection unit micro processing unit and other components. IGBT inside the inverter by breaking to adjust the output voltage and frequency power supply, according to the actual needs of the motor to provide power frequency they need, and thus achieve the purpose of energy, speed, and in addition, there are a lot of drive protection , such as overcurrent, overvoltage, overload and so on. With the continuous improvement of industrial automation, the drive has been very widely used.