With the rapid development of modern power electronic technology and computer control technology, the technical revolution of electric transmission has been promoted. AC speed control instead of DC speed control, computer numerical control to replace analog control has become a trend. AC motor speed control is today's energy conservation, improve production processes, improve product quality, and improve the operating environment as a major means. Frequency control with its high efficiency, high power factor, and excellent speed and start braking performance and many other advantages and has been recognized as the most promising speed control mode. In recent years, some new devices developed will change this status quo, such as IGBT, IGCT, SGCT and so on. By their high-voltage inverter, high performance, PWM inverter can achieve, or even PWM rectifier. Not only has a small harmonic, the power factor is also greatly improved. Inverter features: ①using multiple PWM control, the output voltage waveform close to the sine wave. ② rectifier circuit multiplexing, pulse number, high power factor, the input harmonic small. ③ modular design, compact structure, easy maintenance, enhanced product interchangeability. ④ direct high-pressure output, no output transformer. ⑤ extremely low dv / dt output, without any form of filter. ⑥ Some use optical fiber communication technology to improve the anti-interference ability and reliability of the product. ⑦ automatic bypass circuit power unit, to achieve failure without stopping function. Double Worktables Fully Automatic Vacuum Forming Machine Double Worktables Fully Automatic Vacuum Forming Machine,Double Worktables Fully Automatic Vacuum Forming Machine Assembly,Double Worktables Fully Automatic Vacuum Forming Machine Electric,Foam Food Container Machine haiyuanmachinery , https://www.lkhyplastic.com