Method for tracing motor rotation speed by frequency transformer and device thereof
A technology of motor speed and frequency conversion device, applied in the direction of AC motor control, electrical components, control systems, etc., can solve the problems of reducing product reliability, reducing system reliability, increasing costs, etc., to improve reliability and avoid system failure points , cost saving effect
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[0057] The present invention utilizes the back electromotive force of the motor to track the speed. The basic idea is that the frequency converter outputs currents with different frequencies but with a fixed amplitude. Therefore, the frequency converter must continuously adjust the output voltage value. , The output voltage of the inverter is consistent with the V / F rated parameters of the motor. According to whether the inverter outputs the correct voltage, it can be judged whether the current output frequency is consistent with the motor speed.
[0058] The present invention gradually increases the output frequency of the frequency converter from 0Hz to the maximum frequency (or gradually decreases from the maximum frequency to 0, or gradually decreases to 0 from the last frequency converter stop frequency), and utilizes a closed-loop controller (such as a PID Regulator) closed-loop control frequency converter output current is the rated current of the motor, and the closed-l...
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