volume | PIER Journals

Abstract

To filter out the high harmonic content of the back electromotive force (EMF) in the conventional sliding mode observer (SMO), a novel flux SMO (FSMO) is designed in this paper. The feedback matrix is designed to replace the external filter or other modules, and its higher-order feedback characteristics further enhance the convergence of the FSMO. The Lyapunov function is used to assess the stability of the FSMO. Importantly, a compensated phase-locked loop (CPLL) with an angular compensation strategy is used to extract both position and speed information, resulting in less speed fluctuation and lower position estimation error. Furthermore, the simulation model and experimental platform are developed to evaluate the reliability of the proposed method. Both simulated and experimental results confirm that the proposed hybrid control algorithm performs well in both steady state and dynamic one, high or low speed of the system, with suppressed harmonics of 50.1% and 7.3%, respectively, and an improved response time of 54.1%, providing a concrete program for sensorless control of permanent magnet synchronous motors (PMSMs).

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Professor Han Lin

Ms. Shanshan Wang

Professor Zhonggen Wang

Dr. Xiaobing Zhu

Professor Wenyan Nie