| 摘要 |
PURPOSE:To improve the operating efficiency and to prevent the noise from generating by limiting the deviation between the actual current value and the current command value to the prescribed limit value or lower. CONSTITUTION:A PI controller 10 inputs a current command value i* outputted from a current command value generator 1 and the actual current value (i) supplied from a current detector 8, controls so that the value (i) coincides with the current command value i* in a proportional integration and supplies it as the final current command value i** to the PWM circuit 3. A hysteresis comparator 14 has the upper limit in the prescribed hysteresis width H0 at the up side with the current command value i* as the lower limit, and a hysteresis comparator 15 has the lower limit in the prescribed hysteresis width H0 at the lower side from the upper limit. These outputs A, B, C are supplied to the driver circuit 4 through an AND circuit 16, and an OR circuit 17. |
