QFT robust control of the continuous rotary electro-hydraulic servo motor

In order to improve the low speed tracking performance and high frequency response performance of continuous rotary electro-hydraulic servomotor, this paper analyzed the operating principle of servomotor, and established the mathematical model of electro-hydraulic position servo system with continuous rotary servomotor. Two degree of freedom QFT controller based on quantitative feedback theory of continuous rotary servomotor was designed. Through the experiments, the performance of PID controller and QFT controller based on feed forward and friction disturbance compensation were compared. It is verified that two degree of freedom QFT controller can not only meet the systempsilas requirement with robustness, but also can improve the low speed performance and bandwidth of the system. QFT controller of continuous rotary servomotor is feasible.