| 摘要 |
PROBLEM TO BE SOLVED: To always suppress slot ripples in a motor with stability regardless of load fluctuation and aging. SOLUTION: A current control circuit 18 is fed as input with detection signals from Hall elements 17a, 17b, and 17c, calculates 6f in every sampling cycle, and outputs the result of the calculation to notch filters 22a, 22b, and 22c. The notch filters 22a, 22b, and 22c pass only the frequency components of 6f of current detection signals inputted from current detectors 16a, 16b, and 16c to PID computing means 23a, 23b, and 23c. The PID computing means 23a, 23b, and 23c perform PID computation on the signals of the frequency components of 6f, and output slot ripple suppression signals to adders 21a, 21b, and 21c. |
