| 摘要 |
PURPOSE:To enable steady-state deviation to be set to be zero even if a loop gain in a DC area on a control line is not set to be infinitely great, by arranging a first error detecting means, a second error detecting means, a driving means, a maximum value and minimum value detecting means, a fluctuation width detecting means, an average value detecting means, and a reference value setting means. CONSTITUTION:The input of FG signal to be obtained from an FG 2 to a first speed error detecting means 6 and a second speed error detecting means 7 is provided. By the second speed error detecting means 7, error to the reference frequency of FG signal frequency is detected, and the input of the detected speed error to a motor driving circuit 5 is Provided, and a motor 1 is driveen, with power according to the error between the FG signal, frequency and the reference frequency. In the meantime, by the first speed error detecting means 6, error to the reference frequency of the FG signal frequency is detected, and by a maximum value and minimum value detecting means 8, the maximum value and minimum value of the output of the first speed error detecting means 6 are detected in every specified period. |
