| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor control device capable of controlling an electric motor with a higher voltage resolution than an actual voltage resolution depending on a PWM frequency.SOLUTION: A PWM controller 46 calculates a target duty ratio on the basis of a voltage command value generated by a dq/UVW conversion part 45. The PWM controller 46 sets a duty ratio smaller than a target duty ratio and suited to an actual voltage resolution as a first duty ratio, and sets a duty ratio larger than the target duty ratio and suited to the actual voltage resolution as a second duty ratio. The PWM controller 46 combines and outputs a first PWM signal having the first duty ratio and a second PWM signal having the second duty ratio so that an average value of duty ratios of a plurality of cycles of the PWM signal consisting of a combination of the first PWM signal and the second PWM signal is equivalent to the target duty ratio.SELECTED DRAWING: Figure 2 |
