Analysis of Stator Vibration Characteristics in Synchronous Generators Considering Inclined Static Air Gap Eccentricity

This paper mainly focuses on the impact of inclined static air gap eccentricity (ISAGE) on the electromagnetic characteristics and mechanical performances (vibration, deformation, strain and stress). Considering different ISAGE fault types in the theoretical and finite element analysis (FEA) model o...

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Bibliographic Details
Published in:IEEE access 2023, Vol.11, p.7794-7807
Main Authors: He, Yu-Ling, Li, Yong, Zhang, Wen, Xu, Ming-Xing, Bai, Yi-Fan, Wang, Xiao-Long, Shi, Shan-Zhe, Gerada, David
Format: Article
Language:English
Subjects:
Air gaps
Circuit faults
Eccentricity
Electromagnetic fields
Electromagnetic properties
Finite element method
Generators
Harmonic response
inclined static air gap eccentricity
Magnetic pull
magnetic pulling force per unit area
Mechanical analysis
Phase current
Rotors
stator vibration
Stator windings
Stators
Strain
Synchronous generator
Synchronous machines
Vibration analysis
Vibration measurement
Vibrations
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Summary:This paper mainly focuses on the impact of inclined static air gap eccentricity (ISAGE) on the electromagnetic characteristics and mechanical performances (vibration, deformation, strain and stress). Considering different ISAGE fault types in the theoretical and finite element analysis (FEA) model of synchronous generators, the effects of intersection position of the rotor center axis and stator center axis, rotor inclined angle, and the combination of the previous two fault types on MFD, phase current and radial magnetic pulling per unit area (MPPUA) are analyzed and compared. Then, based on the stator model used uniformly in three physical fields, the harmonic response and mechanical response are investigated with loads imported by the electromagnetic field. Finally, the stator radial vibration measurement experiments are carried out to verify the results obtained by theoretical analysis and FEA. It is shown that ISAGE will considerably enlarge the fluctuation of MPPUA and intensify the radial vibration of the stator, especially at the 2nd harmonic. The probability of failure at tooth tip and inner slot wall of the stator will increase.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2022.3230907