A simple hybrid fuzzy PD controller

In many practical applications, the performance of a controlled system highly depends on whether a high quality differential signal can be obtained based on the non-continuous measured position signal only. In this paper, a simple hybrid fuzzy PD (proportional and derivative) controller is developed, by combining two nonlinear tracking differentiators to a conventional fuzzy PD controller. The main improvement of the proposed simple hybrid fuzzy PD controller is that it has high robustness against noise and easy for engineering implementation. Simulation and experimental comparison studies on motion control of a permanent magnet synchronous AC motor validate the effectiveness and efficiency of the proposed controller. (C) 2004 Elsevier Ltd. All rights reserved.