The inverter is a device that converts power frequency power (50Hz or 60Hz) into AC power of various frequencies to realize the variable speed operation of the motor. The control circuit completes the control of the main circuit, and the rectifier circuit converts the alternating current into direct current. The circuit smoothes and filters the output of the rectifier circuit, and the inverter circuit reverses the direct current into alternating current. For inverters such as vector control inverters that require a lot of operations, sometimes a CPU for torque calculation and some corresponding circuits are required. Frequency conversion speed regulation is to achieve the purpose of speed regulation by changing the frequency of the motor stator winding power supply.
The inverter is mainly composed of rectification (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit and micro-processing unit. The inverter adjusts the voltage and frequency of the output power supply by switching on and off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the inverter has many protection functions. , such as overcurrent, overvoltage, overload protection, etc. With the continuous improvement of industrial automation, frequency converters have also been widely used.
The frequency converter is indispensable in our daily life, so what is the function of the frequency converter?
(1) The frequency converter reduces the voltage fluctuation of the power line;
(2) The inverter controls the starting current of the motor;
(3) The power required by the inverter to start is lower;
(4) Controllable acceleration function;
(5) Adjustable running speed;
(6) Adjustable torque limit;
(7) Controlled stopping methods;
(8) Reversible operation control;
(9) Energy saving;
(10) Reduce mechanical transmission parts.
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