volume | PIER Journals

Abstract

To effectively suppress parameter perturbations, external disturbances, and ensure the stability of the PMSM system under uncertain conditions, this paper proposes a novel fast integral terminal sliding mode composite controller (NFITSMC) for speed-loop of PMSM based on super-twisting integral terminal sliding mode disturbance observer (STITSMO). Firstly, the mathematical model of the PMSM with parameter perturbations and external disturbances is analyzed. Then, the NFITSMC speed-loop controller is designed, where the NFIT sliding mode surface combines proportional, integral, and nonlinear terms, enabling effective suppression of parameter perturbations and external disturbances to ensure system stability under uncertainties. Meanwhile, the adaptive exponential switching reaching law adjusts the convergence speed according to the distance between the system state and the sliding surface, thereby mitigating system chattering. Next, the STITSMO disturbance observer is designed, in which the IT sliding mode surface is combined with a second-order super-twisting control law, allowing dynamic gain adjustment based on error magnitude to achieve global fast convergence of the adaptive nonlinear system. Finally, simulations and experiments validate that the NFITSMC-STITSMO composite controller demonstrates superior performance in finite-time convergence, robustness, chattering suppression, and disturbance rejection, making it suitable for high-performance and high-order PMSM control systems.

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Professor Junqin Liu

Dr. Tianle Li

Dr. Zhentong Wang

Dr. Lin Liu

Dr. Feng Deng

Dr. Xinchun Jiang

Professor Kaihui Zhao

Dr. Xiangfei Li

Dr. Shiyin Gong