| 摘要 |
PURPOSE:To improve the position control accuracy by calculating predictively a position error produced when only the input signal is supplied to a position controller by means of the 1st-3rd differential component signals and adding this position error to the input signal as the error compensation value. CONSTITUTION:Both the signal component and the noise component existing outside the working area of a position controller of an input signal 1 are eliminated through an LPF6. The 1st differential value of the output is detected by the 1st differentiator 7, and the 1st differential compensation value is calculated 8 to compensate a position error 3 produced by the 1st differential value. Then the 2nd and 3rd differential compensation values are calculated in the same way. The 1st-3rd differential compensation values are synthesized 13, and this output compensation value 14 is added 15 with compensation to the input signal. This addition value is sent to a position adder 2 of the position controller. Then a compensation calculation control circuit 17 compares the output of the LPF6 with the output position signal of the position controller. Then the circuits 8, 10 and 12 are controlled by a compensation calculation control signal 18 to obtain the coincidence as high as possible between the compensation value 14 and the position error 3 obtained when the signal 1 is supplied directly to the position controller. |
