| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent overcompensation of a magnetic flux axis current. <P>SOLUTION: A speed control device for an AC motor includes: a torque axis voltage limiter for limiting a torque axis voltage component outputted from a torque axis current controller for performing proportional integration control of a torque axis current to a predetermined value or less; a first subtractor for calculating a torque axis voltage saturation amount on the basis of the torque axis voltage component outputted from the torque axis current controller and a torque axis voltage command outputted from the torque axis voltage limiter; a correction section for correcting the calculated torque axis voltage saturation amount with a torque axis transient voltage saturation amount estimated by an estimator; a first integrator for holding the corrected torque axis voltage saturation amount; a magnetic flux axis current command corrector for calculating a magnetic flux axis current command correction amount on the basis of the held torque axis voltage saturation amount and a rotation angle speed of orthogonal biaxial coordinates to output the correction amount; and a second subtractor for subtracting the magnetic flux axis current command correction amount from a subtracting magnetic flux axis current command to calculate a magnetic flux axis current command correction command and output the command. <P>COPYRIGHT: (C)2013,JPO&INPIT |
