Skip to main content

Research Repository

Advanced Search

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


Ming-Xing Xu

Yu-Ling He

Wen Zhang

De-Rui Dai

Xiang-Ao Liu

Wen-Jie Zheng

Shu-Ting Wan

Principal Research Fellow in Electrical Machines

Shan-Zhe Shi


Federico Barrero


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.


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.

Journal Article Type Article
Acceptance Date Aug 31, 2022
Online Publication Date Sep 2, 2022
Publication Date Sep 2, 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
Keywords doubly fed induction generator (DFIG), radial air gap eccentricity (RAGE), electromagnetic force (EF), end winding vibration
Public URL
Publisher URL


You might also like

Downloadable Citations