A frequency converter is a device that uses power electronics technology to change the power supply frequency of an AC motor, thereby realizing motor speed regulation and control. Here are some basics of a frequency converter:
basic structure
Main circuit: includes rectifier, filter and inverter. The rectifier converts AC to DC; the filter is used to smooth DC voltage or current; the inverter converts DC to AC with adjustable frequency and voltage to power the motor.
Control circuit: mainly composed of microprocessor, signal detection circuit, drive circuit, etc. Its function is to control the main circuit, generate a drive signal to control the inverter switching device according to the parameters set by the user and external input signals, and realize the speed regulation of the motor and various protection functions.
Classification
According to the conversion process, it can be divided into AC-DC-AC inverter and AC-AC inverter. AC-DC-AC inverter first rectifies AC into DC, and then inverts it into AC with variable frequency; AC-AC inverter directly converts AC of one frequency into AC of another frequency.
According to the voltage level, it can be divided into low-voltage inverters (generally referred to as rated voltages below 1kV), medium-voltage inverters (rated voltages between 1kV and 35kV), and high-voltage inverters (rated voltages above 35kV).
By use: can be divided into general inverter, high performance special inverter, high frequency inverter, intermediate frequency inverter and so on.
control method
V/F control: that is, voltage-to-frequency ratio control, the motor is controlled by maintaining the proportional relationship between the output voltage and the frequency. It has a simple structure and low cost, and is suitable for occasions where the accuracy of speed regulation is not high.
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