A sliding mode speed and position observer for a surface-mounted PMSM
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Updated: Feb 1, 2026

High-speed Particle Image Velocimetry Near Surfaces
Published on: June 24, 2013
Yong Chen1, Meng Li1, Yu-Wen Gao1
1School of Automation and Engineering and, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China; Institute of Electric Vehicle Driving System and Safety Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China.
Abstract:
To improve the speed and position observation performance of a Surface-Mounted Permanent Magnet Synchronous Motor (SM-PMSM), an improved sliding mode observer (SMO) based on the adaptive synchronization filter (ASF) and quadrature phase-lock loop (QPLL) is proposed. An adaptive synchronous filter based on feedback rotor position estimation from a QPLL is proposed to extract the fundamental signal of the back electromotive force (back-EMF). Then, a QPLL is linked to calculate the rotor position and speed according to the fundamental signal of the back-EMF, in order to effectively suppress the estimated harmonics and chattering and improve the observation accuracy of speed and position. Finally, the effectiveness and feasibility of the proposed observer approach are verified by simulation and dSPACE.
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