Robust control for LLCC resonant linear piezoelectric ceramic motor drive

This study presents a robust control system for a linear ceramic motor (LCM) that is driven by a high-frequency voltage source inverter using LLCC resonant technique. Since the dynamic characteristics and motor parameters of the LCM are nonlinear and time varying, a robust control system is designed based on the hypothetical dynamic model to achieve high-precision position control. The presentation of robust control for the LCM drive system is divided into three parts, which comprise state feedback controller, feedforward controller and uncertainty controller. The adaptation laws of control gains in the robust control system are derived in the sense of Lyapunov stability theorem such that the stability of the control system can be guaranteed. It not only has the learning ability similar to intelligent control, but also its control framework is more simple than intelligent control. The effectiveness of the proposed robust control system is verified by experimental results in the presence of uncertainties