Article: A fast and chattering-free robust regulation tactic for permanent magnet synchronous motor drive systems based on a novel sliding mode reaching law Journal: International Journal of Power Electronics (IJPELEC) 2026 Vol.22 No.2 pp.219 - 234 Abstract: This paper proposes a robust speed control strategy for permanent magnet synchronous motor (PMSM) drive systems, addressing common issues in traditional sliding mode control (SMC) such as chattering and slow convergence. A novel sliding mode reaching law (NSMRL) is introduced, based on system state variables and a power-modulated sliding surface term, constrained by the absolute value of the switching function. The proposed law, in two forms, significantly reduces chattering while enhancing convergence speed. To further improve disturbance rejection, an extended state observer (ESO) is employed to estimate external disturbances and provide adaptive feedforward compensation. The stability of the integrated NSMRL-ESO control structure is verified through Lyapunov theory. Experimental results under both steady-state (step input) and transient (ramp input) conditions demonstrate superior performance over conventional SMC in terms of convergence speed, tracking accuracy, current smoothness, and robustness to load variations, making it suitable for high-performance PMSM applications. Inderscience Publishers - linking academia, business and industry through research

Title: A fast and chattering-free robust regulation tactic for permanent magnet synchronous motor drive systems based on a novel sliding mode reaching law

Authors: Zhaiaibai Ma; Ye Wang

Addresses: Mechatronics and Automotive Engineering College, Xuchang Vocational and Technical College, Xinxing E Rd., Weidu District, Xuchang, Henan, 461199, China ' Mechatronics and Automotive Engineering College, Xuchang Vocational and Technical College, Xinxing E Rd., Weidu District, Xuchang, Henan, 461199, China

Abstract: This paper proposes a robust speed control strategy for permanent magnet synchronous motor (PMSM) drive systems, addressing common issues in traditional sliding mode control (SMC) such as chattering and slow convergence. A novel sliding mode reaching law (NSMRL) is introduced, based on system state variables and a power-modulated sliding surface term, constrained by the absolute value of the switching function. The proposed law, in two forms, significantly reduces chattering while enhancing convergence speed. To further improve disturbance rejection, an extended state observer (ESO) is employed to estimate external disturbances and provide adaptive feedforward compensation. The stability of the integrated NSMRL-ESO control structure is verified through Lyapunov theory. Experimental results under both steady-state (step input) and transient (ramp input) conditions demonstrate superior performance over conventional SMC in terms of convergence speed, tracking accuracy, current smoothness, and robustness to load variations, making it suitable for high-performance PMSM applications.

Keywords: permanent magnet synchronous motor; PMSM; speed control; torque estimation; accuracy; sliding mode observers; SMO; sliding mode control; SMC.

DOI: 10.1504/IJPELEC.2026.152432

International Journal of Power Electronics, 2026 Vol.22 No.2, pp.219 - 234

Received: 26 Apr 2025
Accepted: 30 Aug 2025
Published online: 19 Mar 2026 *

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Title: A fast and chattering-free robust regulation tactic for permanent magnet synchronous motor drive systems based on a novel sliding mode reaching law

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