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改善空载电压波形是发电机优化设计、保证电能质量的重要问题。采用极靴偏心与阻尼条偏心等不对称磁极结构设计方案,对一台45MW的大型水轮发电机空载电压波形进行优化设计,并利用二维运动电磁场场路耦合时步有限元模型,进行分析与计算。结果表明,合理偏移极靴和阻尼条位置,可以明显削弱齿谐波,改善气隙磁场分布和空载电压波形。计算结果与实测数据相吻合。研究成果已在3个电站的大型水轮发电机上得到工程实际应用。
Improving the no-load voltage waveform is an important issue to optimize the generator design and ensure the power quality. The design of no-load voltage waveform of a 45 MW large hydroelectric generator is optimized by asymmetrical pole structure design such as eccentricity of eccentric pole and eccentricity of damping bar. The two-dimensional moving electromagnetic field is used to couple time-step finite element model Analysis and calculation. The results show that the proper offset of the pole shoes and damping bar can obviously weaken the tooth harmonics and improve the air gap magnetic field distribution and the no-load voltage waveform. The calculated results are consistent with the measured data. The research results have been applied to the engineering of large hydrogenerators in three power plants.