| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a torque ripple caused by the DC offset of a PWM (pulse width modulation) converting part and to enhance the control accuracy. <P>SOLUTION: This AC motor controller is equipped with a voltage zero limiting means which limits three-phase command voltage to zero, a first DC offset current operation means which corrects a DC offset current contained in the current detection means and computes the first DC offset current, a first DC offset current deviation operation means, a first DC offset voltage operation means, and a first DC offset voltage addition means which calculates adjusted three-phase command voltage by adding the first DC offset voltage to three-phase command voltage. <P>COPYRIGHT: (C)2004,JPO |
