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Wahhing customized special dry-type transformer, rectifier phase-shifting transformer and reactor for the inverter system, mainly used in the rectifier unit and inverter unit inside the inverter, and the products provided are applied in standard general-purpose inverter, engineering transmission medium voltage inverter and high-voltage inverter.
Variable frequency drive (VFD) is a kind of power control equipment which uses frequency conversion technology and microelectronics technology to control AC motor by changing the frequency of motor working power supply. The frequency converter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), braking unit, driving unit, detection unit micro processing unit, etc. The frequency converter adjusts the voltage and frequency of the output power supply by the internal IGBT disconnection, and provides the power supply voltage required according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation. In addition, the frequency converter has many protection functions, such as overcurrent, overvoltage, overload protection, etc. With the continuous improvement of industrial automation, frequency converter has been widely used.
The inverter is usually divided into four parts: rectifier unit, high capacity capacitor, inverter and controller.
Rectifier unit: convert the alternating current with fixed working frequency into direct current.
High capacity capacitor: store the converted electric energy.
Inverter: electronic switch composed of high-power switching transistor array, converts DC into square wave with different frequency, width and amplitude.
Controller: operate according to the set program, control the amplitude and pulse width of the output square wave, make the superimposition of the sine wave AC, drive the AC motor.