大型水轮发电机转子动偏心电磁振动仿真

In this paper, a simulation study is made on the electromagnetic vibration of a large hydro generator under different excitation current. The electromagnetic model is modeled by Rmxprt ANSYS . Calculation of electromagnetic field distribution and phase voltage phase current under rated load condition and comparison with measured values .Then the electromagnetic force wave is excited under 25%,50%,75% and 100% four kinds excitation current by the Maxwell dimension tensor method. At last, the vibration frequency and vibration characteristics of the stator support of the rotor eccentric state are obtained by using the harmonic response analysis. It is found that the electromagnetic force wave is mainly concentrated in the eccentric condition of the rotor of the turbine generator. The electromagnetic force is mainly concentrated in the one and two times of rotating frequency, while the electromagnetic vibration is the main one. With the decrease of the excitation current, the electromagnetic force density and electromagnetic vibration decrease gradually and so on.