| 摘要 |
PURPOSE: A slip frequency vector control apparatus of an induction motor is provided to compensate the rotor time constant of the induction motor controlled by an inverter of slip frequency vector control method, thereby preventing the degradation of a vector controller due to the variance of the rotor time constant. CONSTITUTION: A speed controller(1) receives a signal which subtracted the speed of an induction motor(8) from an externally transferred speed command value, and outputs a torque current command value. A current transformer(6) transforms the d, q currents(ia,ib) of a stator into rotation coordinates to output stator current(ids,iqs). A current controller(2) receives torque current and magnetic flux current from a vector control inverter(7) to output a magnetic flux voltage command value and a torque voltage command value through a rotation coordinate control circuit. A coordinate converter(4) receives the magnetic flux voltage command value and torque voltage command value and converts the coordinates of the values to output voltage command values(Va,Vb,Vc). The vector control inverter(7) receives the voltage command values(Va,Vb,Vc) to apply voltage to the induction motor(8). A slip operator(3) output slip frequency(Wsl). An integrator(5) integrates stator appliance frequency(We) to output the position of rotor magnetic flux to the coordinate converter(4) and current transformer(6). A time constant estimator(100) estimates the variance of time constant of the vector control inverter(7) to output a rotor time constant compensating signal to the slip operator(3).
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