Frequency converters are widely used, which are divided into low-voltage frequency converters and medium-high-voltage frequency converters according to voltage levels. The application purposes and requirements of different industries are different:

1, steel: rolling mill, roller table, fan, pump, crane, hot metal tank car, converter tilting, etc.

2. Steel rolling production line: wire drawing machine, winder, blower, pump, hoist, fixed length shearing and automatic feeding.

3. Power: blower, feed pump, centrifugal mixer, conveyor belt, pumping station, flywheel, etc. Used for boiler drum.

4. Petroleum: oil pumps, electric submersible pumps, water injection pumps and pumping units.

5. Paper industry: paper machines, pumps, shredders, fans, mixers, blowers, etc.

The frequency converter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), braking unit, driving unit, detection unit and microprocessor unit. The inverter can adjust the voltage and frequency of the output power supply by switching the internal IGBT, and provide the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation.

In addition, the inverter also has over-current, over-voltage, overload protection and other protection functions. With the continuous improvement of industrial automation, frequency converters have been widely used.

References:

Baidu encyclopedia-frequency converter