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Effect of 3D Unidirectional and Hybrid SAGE on Electromagnetic Torque Fluctuation Characteristics in Synchronous Generator

He, Yu-Ling; Xu, Ming-Xing; Xiong, Jing; Sun, Yue-Xin; Wang, Xiao-Long; Gerada, David; Vakil, Gaurang

Effect of 3D Unidirectional and Hybrid SAGE on Electromagnetic Torque Fluctuation Characteristics in Synchronous Generator Thumbnail


Authors

Yu-Ling He

Ming-Xing Xu

Jing Xiong

Yue-Xin Sun

Xiao-Long Wang

DAVID GERADA D.Gerada@nottingham.ac.uk
Professor of Electrical Engineering



Abstract

This paper presents a comprehensive study on the variation laws of electromagnetic torque (EMT) under static air-gap eccentricity (SAGE) conditions in synchronous generators. Different from other studies, this paper focuses on not only the impact of radial SAGE, but also the effect of axial and hybrid SAGE, on the EMT fluctuation characteristics, i.e., we actually study the 3D static rotor eccentricity. The theoretical analysis model is first set up to study the influence of SAGE on the magnetomotive force (MFD) and EMT. Then, the finite element calculation and the experimental study on the CS-5 prototype generator which is of two poles and 3000 rpm are carried out to validate the theoretical analysis. It is shown that the radial SAGE will increase the dc component of MFD and shift the whole MFD curve and the phase current upwardly, while the axial SAGE will reduce the dc component as well as the amplitudes of both the MFD and the phase current like a compressing operation. In general, no matter in unidirectional or hybrid SAGE cases, the radial SAGE will intensify the EMT ripple and increase each harmonic of EMT, while axial SAGE will play the opposite role. The research conclusion obtained in this paper is potential to be applied as a supplement criterion for the condition monitoring and control of the eccentricity faults.

Citation

He, Y., Xu, M., Xiong, J., Sun, Y., Wang, X., Gerada, D., & Vakil, G. (2019). Effect of 3D Unidirectional and Hybrid SAGE on Electromagnetic Torque Fluctuation Characteristics in Synchronous Generator. IEEE Access, 7, 100813-100823. https://doi.org/10.1109/access.2019.2929868

Journal Article Type Article
Acceptance Date Jul 18, 2019
Online Publication Date Jul 18, 2019
Publication Date 2019
Deposit Date Aug 14, 2019
Publicly Available Date Mar 28, 2024
Journal IEEE Access
Electronic ISSN 2169-3536
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 7
Pages 100813-100823
DOI https://doi.org/10.1109/access.2019.2929868
Keywords Synchronous generator, 3D rotor eccentricity, Electromagnetic torque
Public URL https://nottingham-repository.worktribe.com/output/2427586
Publisher URL https://ieeexplore.ieee.org/document/8766107

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