Abstract
This paper addresses the problems of a composite nonlinear control for the permanent magnet synchronous motors (PMSMs) speed regulation systems, which is primarily constituted by an extended state observer (ESO)-based feedforward compensation and nonlinear proportional feedback (NPF) control law. Firstly, an optimal control synthesis function-based tracking differentiator (TD) is developed to arrange the transition dynamic for the reference speed value, while its high quality differential signal is facilitated. Then, by taking the parametric perturbations and external disturbances into account, a nonlinear extended state observer is designed to estimate the lumped disturbance, such that the system anti-disturbance performance is preserved. Meanwhile, the estimations of system states are also performed. Furthermore, an adaptive proportional control law is proposed, resulting in the eventual composite nonlinear strategy by incorporating the estimate values into the designed NPF controller. Finally, a PMSM servo system is studied to demonstrate the advantages and effectiveness of the proposed approaches.
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