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.
Highlights
The capacity of installed large hydropower generators has been increased in recent years to replace fossil fuel power because of their inestimable advantage for environmental protection and the ability for quick regulation
Large hydropower generators mostly work in a strong electromagnetic field compared with normal hydropower generators
Rotor eccentricity exerts a large influence on the distribution of the electromagnetic field and affects the electromagnetic vibration of the stator in the hydropower generator
Summary
The capacity of installed large hydropower generators has been increased in recent years to replace fossil fuel power because of their inestimable advantage for environmental protection and the ability for quick regulation. Rotor eccentricity exerts a large influence on the distribution of the electromagnetic field and affects the electromagnetic vibration of the stator in the hydropower generator. Until recently, researchers have focused on large hydropower generators with low length-diameter aspect ratios. Rotor eccentricity is one of generators, especially large hydropower generators with low length-diameter aspect ratios. Wangthe calculated the UMP across the large hydropower generator running under the static eccentricity by condition a FEM. UMP but ignored the electromagnetic force produced on the stator, which has a significant impact above investigated UMP but ignored the electromagnetic force produced on the stator, which hason a electromagnetic vibration, and few of vibration, these authors theauthors difference in the the electromagnetic significant impact on electromagnetic and discussed few of these discussed difference in field distribution between static eccentricity and dynamic eccentricity.
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