| 摘要 |
PROBLEM TO BE SOLVED: To prevent on/off of upper and lower arms from being incapable of being restored in the vicinity of 0% or 100% of a PMW command duty ratio in PMW control of an inverter controller.SOLUTION: An inverter controller comprises: an inverter having a pair of switching elements which is for generating AC power supplied to an AC motor having a plurality of phases and corresponds to each phase; current detection means for detecting phase current of each phase of the AC motor; switching control means for controlling on/off of the pair of switching elements on the basis of a result of current comparison between a PWM command signal based on the phase current and a carrier signal having a predetermined period; current zero cross determination means for determining zero cross vicinity of phase current of each phase of the AC motor; and voltage command correction means for making voltage of the PWM command signal be higher or lower than the normal one when a PMW command duty ratio based on the phase current is in the vicinity of 0% or 100% in the zero cross vicinity in PMW control. |
