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International Journal of Sensors, Wireless Communications and Control

Author(s): Oussama Saadaoui*, Amor Khlaief, Moez Abassi and Abdelkader Chaari

DOI: 10.2174/2210327913666230214101119

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Estimation of Rotor Velocity and Stator Resistance for PMSM Drive using Back-EMF SMO

Page: [9 - 17] Pages: 9

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Abstract

Background: Sensorless control of permanent magnet synchronous motor (PMSM) at low speed remains a challenging task.

Introduction: In this paper, a sensorless vector control of PMSM using a new structure of a back EMF sliding mode observer (SMO) is proposed.

Methods: To remove the mechanical sensors, a back EMF-SMO is built to estimate the rotor position and speed of PMSM drives. The SMO, which replaces a sign function with a sigmoid function, can reduce the chattering phenomenon. This sensorless speed control shows great sensitivity to stator resistance and system noise.

Results & Discussion: To improve the robustness of sensorless vector control, the back EMFSMO technique has been used for stator resistance estimation. A novel stator resistance estimator is incorporated into the sensorless drive to compensate for the effects of stator resistance variation.

Conclusion: The validity of the proposed SMO with a 1.1 kw low-speed PMSM sensorless vector control has been demonstrated by real experiments.

Keywords: Back-EMF Sliding Mode Observer (SMO), Permanent Magnet Synchronous Motor (PMSM) drive, sigmoid function, stator resistance estimation, MRAS, sensorless vector control.

Graphical Abstract

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