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Energies 2017, 10(12), 2155; https://doi.org/10.3390/en10122155

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

1,2,* , 1,2,* , 1,2
and
1,2
1
School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2
Hubei Key Laboratory of Digital Valley Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
*
Authors to whom correspondence should be addressed.
Received: 29 October 2017 / Revised: 9 December 2017 / Accepted: 12 December 2017 / Published: 17 December 2017

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. View Full-Text
Keywords: rotor eccentricity; maxwell stress tensor (MST); variable load; coupled analysis; electromagnetic vibration rotor eccentricity; maxwell stress tensor (MST); variable load; coupled analysis; electromagnetic vibration
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Li, R.; Li, C.; Peng, X.; Wei, W. Electromagnetic Vibration Simulation of a 250-MW Large Hydropower Generator with Rotor Eccentricity and Rotor Deformation. Energies 2017, 10, 2155.

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