Electromagnetic Vibration Simulation of a 250-MW Large Hydropower Generator with Rotor Eccentricity and Rotor Deformation

Ruhai Li, Chaoshun Li, Xuanlin Peng and Wei Wei
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Ruhai Li: School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Chaoshun Li: School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Xuanlin Peng: School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Wei Wei: School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2017, vol. 10, issue 12, 1-19

Abstract: The electromagnetic vibration caused by electromagnetic force on the stator has threatened large hydro generators operating safely and stably. At the Zhexi hydropower station, the hydro generator was beset by electromagnetic vibration for a long time. Therefore, the paper provided a new method to help to find the vibration source and detect the hydro generator fault, through the combination of simulation and experiments. In this paper, the 3D stator pack structure model and the 2D hydro generator electromagnetic models under rotor eccentricity and rotor ellipse deformation conditions were built. Then, electromagnetism simulations were conducted to study the characteristics of the electromagnetic flux and electromagnetic force under different conditions by using the finite element method (FEM). Lastly, the vibration testing experiments and harmonic response simulations of stator frame were performed to present the characteristics of vibration distribution in frequency conditions. The simulation results were compared with the generator measured data to try to find out the main vibration source and guide the overhaul.

Keywords: rotor eccentricity; maxwell stress tensor (MST); variable load; coupled analysis; electromagnetic 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: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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