MOTOR CONSTANT TUNER AND MOTOR CONTROLLER

PURPOSE:To measure and tune excitation inductance with accuracy without voltage detector by compensating the value of the excitation inductance, using the output of the current control loop, which outputs the compensated value where the deviation is made zero by operating the deviation between a torque current command value and a torque current detection value. CONSTITUTION:The motor driven using a power converter is noload-operated, and using primary resistance gamma1 set in advance for excitation inductance tuning, primary leakage inductance l1+l2' and noload operation command value primary frequency omega1*, a voltage command Vq*, and a detection current value Id and Iq, excitation inductance is operated. And this is equipped with a current control loop IqACR, which outputs such compensated value as to make the deviation zero by operating the deviation between a torque current command value and a torque current detection value, and a compensating means, which compensates the value of the excitation inductance being roughly set using the output of the IqACR. Hereby, the value of the excitation inductance can be calculated with accuracy.