Research on sensorless control of HSPMSM based on a discrete full-order sliding mode observer

To address the inaccuracy of the observed rotor position caused by the large estimated back-electromotive force harmonics of the high-speed permanent magnet synchronous motor (HSPMSM) under the conventional sliding mode observer, this paper presents an adaptive full-order sliding mode observer for back-electromotive force (EMF) based on the accurate mathematical model of the HSPMSM in the discrete-time domain. The accuracy of the sliding mode observer is improved under high-speed operating conditions by using the proposed method. To further reduce the harmonic component of the observed back EMF, a synchronous fundamental frequency extraction filter (SFEF) is used to obtain the back EMF, and then, the extracted observed EMF is fed in;to the normalized phase-locked loop to obtain the rotor position. The simulation results in Matlab are presented to demonstrate the feasibility and effectiveness of the proposed method. (c) 2023 Published by Elsevier Ltd. This is an open access article under the CCBY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).