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Inverter is a power frequency power supply into any frequency, any voltage AC power supply of an electrical equipment, the use of the inverter is to adjust the motor power to achieve the motor variable speed operation. The composition of the inverter includes the control circuit and the main circuit of two parts, of which the main circuit also includes rectifier and inverter components. The working principle of the inverter is to control the main circuit through the control circuit. The rectifier in the main circuit converts the alternating current into the direct current. The direct current intermediate circuit smoothes the direct current, and the inverter finally converts the direct current into the alternating current with the required frequency and voltage , Some frequency converters will also add CPU and other components in the circuit to carry out the necessary torque calculation. The birth of the inverter from AC motor speed requirements for stepless speed, with the thyristor, electrostatic induction transistor, high voltage insulated gate bipolar thyristor and other components appear, with rapid changes in electrical technology, inverter speed control technology With the development of special pulse-width modulation frequency conversion speed control technology is to allow the inverter boarded a new level. Frequency power inverter power supply is generally 50Hz or 60Hz, whether it is in the field of home or production, power frequency power supply voltage and voltage are constant. The motor working on power frequency power may cause the power to drop when the speed is adjusted. By the adjustment of the frequency converter, the motor can reduce the power loss when adjusting the speed. There are various types of inverters, which can be divided into general inverters, high-performance inverters, high-frequency inverters, single-phase inverters and three-phase inverters etc. according to the different uses of the inverters. According to the working principle of inverters, they can be classified into V / f control inverter, slip frequency control inverter and vector control inverter.