| 摘要 |
PURPOSE:To enhance the response of a torque control while securing the stability of a current control system. CONSTITUTION:A vector control for an induction motor obtains a torque shaft voltage VQ and an exciting shaft voltage VD by a current control system of a digital calculation from a torque current command IT and an exciting current command IO, PWM-controls it from the voltage, and obtains a primary voltage V1 from the voltages VQ, VD. The control comprises a limiter 11e for correcting a previous value stored in 1/Z with deviations VDerr, VQerr when the voltage V1 exceeds a maximum voltage (control ratio 1) Vmax of the PWM-control, limits the integrated value of an integrating item to the voltages VD, VQ corresponding to the Vmax, and fastens the return of the integrated value when the primary voltage becomes low. |
