| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor drive device capable of suppressing generation of a surge voltage even when an applied voltage is varied.SOLUTION: A control device, when a 2-phase modulation method is selected in a step 140 and an input voltage VB is determined to be equal to or more than a predetermined voltage Va in a step 130, a PWM modulation method is switched from the 2-phase modulation method to a 3-phase modulation third harmonic correction method. When a modulation Mod is determined to be equal to or more than a predetermined value Ma in a step 150, a modulation rate is restricted. |
