| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a motor control device which can make feedback control of a three-phase AC motor so that its current value in each phase becomes the target current value accurately without causing complication of the configuration and increase in the cost. SOLUTION: A target current value in each phase of a three-phase AC motor 12 is calculated according to the amount of change. The current value in each phase of the motor 12 is sensed by a current sensing device 42. When the target current value remains zero continuously for the set time, the cumulated value of the sensed current value is divided by the set time so that the offset value is calculated. The sensed current value is corrected by subtracting the offset value from the sensed current value. On the basis of the deviation of the corrected sensed current value from the target value, a feedback control is conducted so that the current value in each phase becomes the target value.</p> |
