| In the running process of hydraulic generator vibration very Serious will lead to the generator increasing wear or tear, reducing the generator safety production life or the rotor rotating eccentric affect the efficiency of power generation. Even in sometime tremendous property damage or personal injury will be caused by failure of power generation, such as in 2009 Russia saryon Hydropower Station accident. So it is significant to study the vibration of the hydro generator for disaster reduction. In recent years, with the large scale of the hydro generator, the electromagnetic vibration caused by the large current strong magnetic field is becoming more and more important for the large scale of the turbine.So hydro generator in operation process of electromagnetic properties and vibration characteristics gradually become research hotspot. Hydro generator electromagnetic vibration is mainly by electromagnetic force wave generator stator in changes in electromagnetic fields excited by. The hydro generator stator electromagnetic force and the intrinsic mode is the key of electromagnetic vibration. In addition, the stator temperature of turbine generator will affect the magnetic density distribution and the influence of electromagnetic vibration. This paper in hydrogenerator electromagnetic vibration of the finite element analysis method, separately carried on the analysis of electromagnetic force and structural harmonic response analysis and temperature, electromagnetic, structure of multi physics field coupling analysis.(1) According to the structural parameters of the hydro generator, the three-dimensional model of the stator of the generator is drawn by UG software, and the model is simplified and transformed to suit the finite element analysis.. The model is loaded into the workbench mode analysis module, and the first 12 modal natural frequencies and mode shapes of the stator system of the hydro generator are simulated..(2) In Maxwell established Hydrogenerator finite element two-dimensional model and the external circuit, after loading model incentive and restraint of electromagnetic finite element simulation, solving the hydro generator output line current, line voltage and the comparative literature to determine the electromagnetic model of turbine generator of effectiveness. The distribution of electromagnetic field and electromagnetic force density between the stator and rotor air gap is calculated..(3) Will hydro generator electromagnetic analysis and harmonic response analysis of coupled, the electromagnetic force of the end of stator tooth loading 3D model simulation analysis under different frequency electromagnetic force harmonic excitation stator surface vibration frequency distribution and vibration peak of hydrogenerator stator system distortion.(4) Through the electromagnetic force density affect the temperature calculated by solving the electromagnetic field in the stator windings produce copper loss and temperature field two-way coupled water wheel generator, and then the electromagnetic analysis and harmonic response analysis of coupling, qualitative analysis the impact of the temperature water turbine electromagnetic vibration characteristics change.The Maxwell stress tensor method of hydro generator electromagnetic force are studied. At the same time, the multi field coupling and two-way coupling method is used to study the vibration of hydrogenerator stator frame. Proposed a complete set of simulation analysis method, which laid the foundation for the further research of hydraulic generator vibration, have certain reference value for engineering applications. |
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