Control strategy of permanent magnet synchronous motor based on enhanced adaptive super-twisting sliding mode observer

• Published in: Dianji yu Kongzhi Xuebao = Electric Machines and Control Vol. 29; no. 6; p. 1
• Main Authors: Song, Yusheng, Zhuo, Senqing, Li, Fashun, Wang, Xuan, Guo, Changxing, Shen, Chuanwen
• Format: Journal Article
• Language: Chinese; English
• Published: Harbin Harbin University of Science and Technology 01.01.2025
• Subjects: Back electromotive force; Boundary layers; Electromotive forces; Linear functions; Low pass filters; Nonlinear control; Parameter robustness; Permanent magnets; Rotor speed; Smoothness; Synchronous motors; Twisting
• ISSN: 1007-449X
• DOI: 10.15938/j.emc.2025.06.001

In response to the chattering issue caused by the discontinuity of the sign function in sliding mode observers（SMO） for permanent magnet synchronous motors（PMSM）, and aiming to reduce the complexity introduced by the low-pass filter（LPF） and phase compensation stages, an enhanced adaptive super-twisting sliding mode observer（E-ASTSMO） was proposed for sensorless control. A second-order non-linear function with continuous smoothness and adjustable boundary layer was employed to replace the switching function in super twisting sliding mode observer（STSMO）, thereby improving the system's continuity, effectively suppressing torque ripple, and reducing inherent sliding mode oscillations. A sliding mode coefficient adaptable to the rotor speed was designed, which enhances both low and high-speed domains for back-electromotive force estimation, enabling precise rotor position estimation across a wider speed range, consequently reducing the speed error and rotor position estimation error. Comparative simulations and experiments between the E-ASTSMO and traditional SMO were conducted. Results demonstrate that the E-ASTSMO exhibits superior dynamic performance, steady-state rotor position estimation, and parameter robustness, effectively enhancing the sensorless control performance of PMSM.