Journal
IEEE ACCESS
Volume 11, Issue -, Pages 7794-7807Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2022.3230907
Keywords
Stators; Rotors; Air gaps; Generators; Stator windings; Vibrations; Circuit faults; Synchronous generator; inclined static air gap eccentricity; magnetic pulling force per unit area; stator vibration
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This paper investigates the impact of inclined static air gap eccentricity (ISAGE) on the electromagnetic characteristics and mechanical performances. Different ISAGE fault types are considered in the theoretical analysis and finite element analysis (FEA) model of synchronous generators. The study analyzes and compares the effects of intersection position, rotor inclined angle, and the combination of fault types on various parameters. Experimental measurements are also conducted to verify the theoretical and FEA results.
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.
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