Impact of Radial Air-Gap Eccentricity on Stator End Winding Vibration Characteristics in DFIG

Xu, Ming-Xing; He, Yu-Ling; Zhang, Wen; Dai, De-Rui; Liu, Xiang-Ao; Zheng, Wen-Jie; Wan, Shu-Ting; Gerada, David; Shi, Shan-Zhe

Abstract

In this paper, qualitative theoretical derivations, finite element analysis (FEA) and experiments are used to investigate the electromagnetic force (EF) and vibration characteristics of end windings. In contrast to previous studies, this study focuses not only on end winding EF/vibration under normal and radial static air gap eccentricity (RSAGE) conditions, but also for the cases of radial dynamic air gap eccentricity (RDAGE) and radial dynamic static hybrid air gap eccentricity (RHAGE). Firstly, the magnetic flux density (MFD) is derived for normal and radial air gap eccentricity (RAGE) faults, and detailed EF expressions are obtained before and after the RAGE fault. The finite element analysis (FEA) and experimental studies were performed on a four-pole DFIG at a speed of 1500 rpm to verify the proposed theoretical analysis. It is shown that RSAGE only enlarges the EF/end winding vibration and does not introduce new frequency components. RDAGE not only increases EF/end winding vibration but also introduces new frequency components. RHAGE can be seen as a superimposed effect of RSAGE and RDAGE.

Citation

Xu, M., He, Y., Zhang, W., Dai, D., Liu, X., Zheng, W., …Shi, S. (2022). Impact of Radial Air-Gap Eccentricity on Stator End Winding Vibration Characteristics in DFIG. Energies, 15(17), Article 6426. https://doi.org/10.3390/en15176426

• Journal Article Type: Article
• Acceptance Date: Aug 31, 2022
• Online Publication Date: Sep 2, 2022
• Publication Date: Sep 1, 2022
• Deposit Date: Feb 11, 2023
• Publicly Available Date: Feb 13, 2023
• Journal: Energies
• Electronic ISSN: 1996-1073
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 15
• Issue: 17
• Article Number: 6426
• DOI: https://doi.org/10.3390/en15176426
• Keywords: doubly fed induction generator (DFIG), radial air gap eccentricity (RAGE), electromagnetic force (EF), end winding vibration
• Public URL: https://nottingham-repository.worktribe.com/output/12317900
• Publisher URL: https://www.mdpi.com/1996-1073/15/17/6426