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

Ming-Xing Xu, Yu-Ling He, Wen Zhang, Dai De-Rui, Xiang-Ao Liu, Wen-Jie Zheng, Shu-Ting Wan, David Gerada and Shan-Zhe Shi
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Ming-Xing Xu: Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention, North China Electric Power University, Baoding 071003, China
Yu-Ling He: Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention, North China Electric Power University, Baoding 071003, China
Wen Zhang: Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention, North China Electric Power University, Baoding 071003, China
Dai De-Rui: Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention, North China Electric Power University, Baoding 071003, China
Xiang-Ao Liu: Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention, North China Electric Power University, Baoding 071003, China
Wen-Jie Zheng: Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention, North China Electric Power University, Baoding 071003, China
Shu-Ting Wan: Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention, North China Electric Power University, Baoding 071003, China
David Gerada: Power Electronics, Machines and Control Group, University of Nottingham, Nottingham NG7 2RD, UK
Shan-Zhe Shi: State Grid Hebei Electric Power Company, Shijiazhuang 050022, China

Energies, 2022, vol. 15, issue 17, 1-12

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.

Keywords: doubly fed induction generator (DFIG); radial air gap eccentricity (RAGE); electromagnetic force (EF); end winding vibration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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