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Electrical Engineering

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24-06-2023 | Original Paper

Sensorless control of PMSM based on third harmonic back EMF and SOGI-FLL

Authors: Zhuang-Zhuang Xin, Jia-Jun Wang, Hai-Guang Sun, Tao Lin, Dong-Liang Liu

Published in: Electrical Engineering | Issue 6/2023

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Abstract

The sensorless control of permanent magnet synchronous motors (PMSMs) based on the model is usually affected by changes in motor parameters. For this reason, this paper proposes a novel method based on the neutral point third harmonic back electromotive force (EMF) and a second-order generalized integrator-based frequency-locked loop (SOGI-FLL). This method is not related to any motor parameters and only requires a neutral wire. Firstly, the relationship between neutral point voltage and third harmonic back EMF is analyzed, and a new low-cost third harmonic back EMF detection circuit and sampling method is presented. A cascaded structure consisting of a limiting filter and a sliding window median filter is designed to filter out switching spike pulses and sampling noise. Then, SOGI-FLL technology is applied to extract and track the rotor position and filter out non-third harmonic signals caused by the asymmetry of the three-phase back EMFs. Finally, simulation and experimental results demonstrate that the proposed method has high static and dynamic position estimation accuracy.

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Title: Sensorless control of PMSM based on third harmonic back EMF and SOGI-FLL
Authors: Zhuang-Zhuang Xin
Jia-Jun Wang
Hai-Guang Sun
Tao Lin
Dong-Liang Liu
Publication date: 24-06-2023
Publisher: Springer Berlin Heidelberg
Published in: Electrical Engineering / Issue 6/2023
Print ISSN: 0948-7921
Electronic ISSN: 1432-0487
DOI: https://doi.org/10.1007/s00202-023-01894-4

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