Design of Hybrid Fuzzy and Position-Velocity Controller for Precise Positioning of a Servo System

Nowadays, new technologies demand precision servo systems that have the ability to provide high accuracy motion and to reject system disturbances such as load disturbance. In our previous paper (2018), the control performance of a servo system (a cart driven by a DC motor) has been improved through scheduling the parameters of a position-velocity controller according to the concept of a fuzzy logic scheme. However, the targeted performance requirements such as settling time and peak overshoot still a challenging point. In order to provide high positioning accuracy, a hybrid fuzzy and position-velocity controller has been proposed in this study as a robust control scheme against the load disturbance. The effectiveness of the proposed scheme has been investigated using a numerical simulation. The obtained results are discussed and compared with those of our previous study.