| 摘要 |
PURPOSE:To inhibit a disturbance component by adding the disturbance component contained in an error signal to the error signal, delayed only by the period of the disturbance component. CONSTITUTION:A rotational speed signal is outputted from a rotational speed detector 2, and transmitted over a frequency discriminator 3 and the error signal of voltage corresponding to difference with reference frequency is formed. The error signal is processed by an integrating circuit 4 and an amplifier 5, and transmitted over an adder 7. An output signal (e) from the adder 7 is transmitted over a driver 6. The output signal (e) from the adder 7 is transmitted over a frequency analyzer 8 and a delay circuit 9. The frequency analyzer 8 detects a disturbance component included in the output signal (e) from the adder 7, and the delay circuit 9 delays the output signal (e) from the adder 7 only by the period section of the disturbance component detected, and supply it to the adder 7. |
