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Electrical, Control and Communication Engineering

The Journal of Riga Technical University

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2255-9159
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Sliding-Mode Observer for Speed and Position Sensorless Control of Linear-PMSM

Saeed Masoumi Kazraji / Ramin Bavili Soflayi / Professor, Mohammad Bagher Bannae Sharifian
Published Online: 2014-05-17 | DOI: https://doi.org/10.2478/ecce-2014-0003

Abstract

The paper presents a sliding-mode observer that utilizes sigmoid function for speed and position sensorless control of permanent-magnet linear synchronous motor (PMLSM). In conventional sliding mode observer method there are the chattering phenomenon and the phase lag. Thus, in order to avoid the usage of the low pass filter and the phase compensator based on back EMF, in this paper a sliding mode observer with sigmoid function for detecting the back EMF in a PMLSM is designed to estimate the speed and the position of the rotor. Most of conventional sliding mode observers use sign or saturation functions which need low pass filter in order to detect back electromotive force (back EMF). In this paper a sigmoid function is used instead of discontinuous sign function to decrease undesirable chattering phenomenon. By reducing the chattering, detecting of the back EMF can be made directly from switching signal without any low pass filter. Thus the delay time in the proposed observer is eliminated because of the low pass filter. Furthermore, there is no need to compensate phase fault in position and speed estimating of linear-PMSM. Advantages of the proposed observer have been shown by simulation with MATLAB software.

Keywords: Permanent magnet motors; Motor drives; Observers; Sliding mode control; Sensorless control

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About the article

Published Online: 2014-05-17

Published in Print: 2014-05-01


Citation Information: Electrical, Control and Communication Engineering, ISSN (Online) 2255-9159, DOI: https://doi.org/10.2478/ecce-2014-0003.

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© Riga Technical University. This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. BY-NC-ND 3.0

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