Fuzzy Hybrid Control for DC Servomotor

In recent years, fuzzy control has found significant applications in many engineering fields. However, the design method of fuzzy control systems has not been established yet, and it is difficult to realize a precise control because control signals are derived from fuzzy scheme of inferences. On the other hand, it is well known that a conventional PD linear control can offer a precise control.In this paper, a new hybrid control scheme is proposed, which is attempt to combine the advantages of PD control and a fuzzy control. In the points which are close to the reference point, a PD control is mainly used to obtain the precision, and in other points a fuzzy contol is mainly used to improve the transient response and to cope with the nonlinearity of systems. From the experimental results on position control of DC servomotor, it is confirmed that the proposed hybrid controller performes better than either PD or fuzzy control.