Model-Free Sliding Mode Control Method for PMSM Based on a Second-Order Super-Twisting Observer

doi:10.3969/j.issn.1008-0198.2025.05.008

Abstract

Abstract: Aiming at the problems of slow convergence of speed error and serious vibration in the traditional sliding mode control of interior permanent magnet synchronous motor (IPMSM), a IPMSM control method combining a novel second-order super-twisting observer（NSTO） with a model-free non-singular terminal sliding mode control (MFNTSMC) algorithm is proposed. First, a mathematical model of IPMSM containing unknown parameters and load disturbances is established, and an MFNTSMC algorithm is designed. Then, based on the hyper-local model, a dual closed-loop MFNTSMC structure is developed to achieve global fast convergence of the system state errors. To further improve speed tracking performance, a novel second-order super-twisting sliding mode disturbance observer is designed to observe system disturbances in real time for disturbance compensation. Finally, simulation and experimental results demonstrate that compared with traditional methods, the proposed approach offers significant advantages in suppressing vibration, improving convergence speed and robustness.

Key words: permanent magnet synchronous motor, model-free sliding mode control, second-order super-twisting sliding mode observer, hyper-local model

CLC Number:

TM341

XIAO Qianghui, WEI Ziquan, LI Jianying, ZHANG Wei, ZHONG Dingai, ZHANG Mai, CHENG Zhun. Model-Free Sliding Mode Control Method for PMSM Based on a Second-Order Super-Twisting Observer[J]. Hunan Electric Power, 2025, 45(5): 55-63.

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