Servo system adjusting method and servo control system

A servo control system of an integration-proportional differentiation type compensation system for generating a control input for an object to be controlled by summing an integration of a control error, a controlled amount output from the controlled object and differentiation of the controlled amount, multiplied by coefficients, respectively, wherein a transfer function of the object to be controlled is approximated by a double-integral-type, comprising:

• selecting means for selecting one of a feedback gain coefficient F.sub.1 of differentiation of the controlled amount, a feedback gain coefficient F.sub.2 of the controlled amount and a gain coefficient H of integration of the control error;
• setting means for setting a gain value of the selected feedback gain coefficient;
• determining means for determining values of the remaining feedback gain coefficients based on the set gain value of the selected feedback gain coefficient and the formulas:
• F.sub.2 /F.sub.1 =a*H/F.sub.2
• F.sub.1 =b*(F.sub.2 /F.sub.1)/K
• where
• 2.ltoreq.a.ltoreq.3,
• 1.5.ltoreq.b, and
• K is a gain of the object to be controlled;
• and
• setting means for setting the determined values of the remaining feedback gain coefficients.