| 摘要 |
<P>PROBLEM TO BE SOLVED: To hold switching suspension phase surely for voltage phase change in phase switching. <P>SOLUTION: The inverter controller 10 providing a switching suspension section in the voltage command of each phase by switching the phase sequentially based on the voltage phase comprises a phase difference detecting section 21 for detecting the voltage phase using a biaxial voltage phase being obtained from a biaxial voltage command and a current phase being taken out from a motor 3, and a two-phase PWM converting section 22 for setting a predetermined offset voltage in the vicinity of the positive side and negative side of the voltage command of each phase by switching the phase sequentially for each predetermined voltage phase of the detected voltage phases, holding the switched voltage phase to the phase being switched if it is within a predetermined hysteresis region when the voltage phase varies at the time of phase switching and returns back to the voltage phase of the switching phase and outputting the predetermined offset voltage to the voltage command of the switched phase thus correcting the voltage command. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
