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针对转子动偏心状态下某大型水轮发电机在不同励磁电流工况下的电磁振动问题,采用ANSYSRmxprt组件建立2D瞬态电磁仿真模型,通过麦克斯韦应力张量法分别求出水轮发电机定子铁芯齿端在25%、50%、75%、100%四种不同励磁电流激励下所受的电磁力密度频域分布;最后将电磁力密度各阶谐波加载到3D定子系统齿端,通过2D电磁与3D结构谐响应耦合分析获得转子动偏心状态下水轮发电机定子支座在空载变励磁工况下的振动频域分布。研究发现,水轮发电机转子偏心工况下电磁力波主要集中在一倍转频上,而电磁振动以一倍转频为主,同时随着励磁电流减少,电磁力密度和电磁振动逐渐降低。
Aiming at the electromagnetic vibration problem of a large hydroelectric generator under different exciting current conditions under the condition of rotor eccentricity, a 2D transient electromagnetic simulation model was established by using ANSYSRmxprt component. The stator iron core teeth of the hydrogenerator were obtained by Maxwell stress tensor method respectively. Frequency distribution of the electromagnetic force under the excitation of 25%, 50%, 75% and 100% excitation currents. Finally, the various orders of the electromagnetic force density are loaded to the tooth ends of the 3D stator system, and the 2D electromagnetic And 3D structure harmonic response-coupled analysis to obtain the vibration frequency domain distribution of the hydrogenerator stator support under no-load and variable excitation conditions under rotor eccentricity. It is found that the electromagnetic force waves are mainly concentrated on the frequency of one revolution while the eccentricity of the hydrogenerator rotor is eccentric, while the frequency of electromagnetic vibration is dominated by one frequency. At the same time, as the excitation current decreases, the electromagnetic force density and electromagnetic vibration gradually decrease .