Motor control method and circuit for stable operation of AC motor in full frequency range
A technology for stable operation of AC motors, applied in AC motor control, motor generator control, electronic commutation motor control, etc., can solve problems such as unstable operation, large parameter influence, and slow magnetic field establishment, so as to broaden the stable range, Increase ease of use and good promotion effect
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[0048] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.
[0049] The invention can control the stable operation of the AC motor in the full frequency range, avoids the phenomenon of unstable operation without encoder feedback control, adopts low-frequency current closed-loop control, has strong load capacity, and high-frequency VF control, fully utilizes the advantages of VF control, and realizes two The mode switches smoothly.
[0050] A motor control circuit for stable operation of an AC motor in the full frequency range, such as figure 1 As shown, it includes the first harmonic function generator RFG1, current PID controller, limiter, integrator, Uq generator, park inverse transformation unit, PWM modulator, Park transformation unit, Clarke transformation unit, the second harmonic function generator RFG2 and the generator for calculating the dir...
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