High-performance current control is critical for obtaining smooth output torque in permanent-magnet synchronous motors (PMSMs). To this end, a new proportional-integral (PI) tuning method based on multivariable sliding-mode extremum seeking is proposed in this study and applied for current control of a PMSM. In the proposed method, a sliding-mode extremum seeking optimiser varies the PI gains by minimising a cost function based on the feedback error term. The resulting PI controller can achieve fast and accurate tracking response, high disturbance rejection, and low sensitivity to PMSM parameter variations. The stability of the proposed control strategy is investigated through a Lyapunov analysis and its performance is evaluated through experimental studies. The results indicate that the proposed controller can offer improved performance in terms of accuracy, parametric variations, and load torque disturbances when compared with a conventional PI and a recently proposed PI controller using the gradient-based extremum seeking tuning method. 2 Multivariable sliding-mode PI tuning 2.1 Controller design Consider a general non-linear plant as follows: y = f (u, t) (1)
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.