The world's first commercial
frequency converter was born in 1967, which was developed by Finland Vasa Control System Co., LTD., formerly STRONGB of Sweden.Frequency converter integrates high voltage high power transistor technology and electronic control technology, and is widely used. The function of frequency converter is to change the frequency and amplitude of ac motor power supply, so as to change the period of its moving magnetic field, so as to achieve smooth control of motor speed. The appearance of frequency converter simplifies the complex speed control. The combination of frequency converter and AC squirrel cage induction motor replaces most of the work that can only be done by DC motor previously, and reduces the volume and maintenance rate, so that the transmission technology develops to a new stage.
Frequency converter is the application of frequency conversion technology and microelectronics technology. Frequency converter by changing the motor working power frequency mode to control the ac motor power control equipment. Inverter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), brake unit, drive unit, detection unit and micro-processing unit. The inverter adjusts the voltage and frequency of the output power supply by the internal IGBT switching. According to the actual needs of the motor to provide its required power supply voltage, and then achieve the purpose of energy saving, speed regulation. In addition, the frequency converter has many protection functions, such as over current, over voltage, overload protection and so on. With the continuous improvement of industrial automation,
frequency converter has been widely used.
