Frequency converter is very widely used, according to the voltage level of low-voltage frequency converter and medium and high-voltage frequency converter, the purpose of the application of each industry and the needs of the differences:
1, iron and steel: rolling mills, roller conveyor, blower, pumps, cranes, ladle trucks, converter tilting, etc..
2, rolling steel making line: wire drawing machine, winding machine, blower, pump, crane, fixed length shear, automatic feeding.
3, electric power: boiler drum with a blower, feed pumps, centrifugal mixer, conveyor belts, lifting power station, flywheel, etc..
4, oil: oil transfer pumps, electric submersible pumps, water injection pumps, pumping machines and so on.
5, paper industry: paper machine, pumps, pulverizers, fans, mixers, blowers and so on.
The frequency converter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), braking unit, drive unit, detection unit microprocessor unit and so on. Frequency converter rely on the internal IGBT on and off to adjust the output power supply voltage and frequency, according to the actual needs of the motor to provide the required power supply voltage, and thus achieve the purpose of energy saving, speed regulation.
In addition, the frequency converter has a lot of protection functions, such as over-current, over-voltage, overload protection and so on. With the increasing degree of industrial automation, frequency converter has also been very widely used.
Reference:
Baidu Encyclopedia - Frequency Converter