| 摘要 |
PURPOSE:To reduce a rotational speed variation by causing a frequency transfer function from a load torque variation to said rotational speed variation to be zero or to an extremely small value in a particular frequency group and by improving said transfer function also in other frequencies. CONSTITUTION:A compensating means 4 produces a control signal (c) operating according to a detected signal (b) of a speed detector 3 to drive a motor 1 by a power amplifier 8. The compensating means 4 performs actions of a rotational error-computing means and a control signal-producing means prior to those of a stored value-preserving means, immediately after the speed detector 3 has obtained a new detected digital signal. Also, the stored value preserving means is switched so as to practice its action or not to do so according to the results of the judgement of a stable-state judging means. |
