摘要
针对目前的端部场计算模型一般不包括定子铁心，故在定子铁心边段附近关键区域内的磁密计算值与实测值有较大的误差，不能满足工程要求的问题，首次将水轮发电机端部磁场的求解区域扩展到定子铁心中，建立了将端部与定子铁心边段有效部分结合起来总体考虑的新模型，模型中考虑了定子铁心的各向异性及非线性。导出与模型相应的三维各向异性涡流场边值问题及与之等价的条件变分问题。采用有限元法对ＴＳＳ８５４／９０－４０型水轮发电机的端部磁场进行了实例计算，结果表明：新模型能使端部磁场的计算精度大大提高。另外，对影响水轮发电机端部磁场的某些因素进行了分析，为大型水轮发电机端部结构的改进提供了理论依据。
The end packets of stator core are not included in the existing models for analyzing the electromagnetic field in the end zone of hydraulic generators, so they are difficult to exactly determine the electromagnetic field near the end packets of stator core. Be aimed at this, a new model is presented in which end zone and end packets of stator core are all included together, and the anisotropism as well as nonlinearity of the stator core are considered. The boundary value problem and the equivalent variation problem corresponding to the new model are derived. The field in the end region of TSS854/90 40 hydraulic generator is calculated by the finite element method (FEM). The calculated results are identical to the measured results. Some factors which affect the field are analyzed. This provides the basis to improve the end structure design of large hydraulic generators.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1998年第3期20-23,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金
关键词
水轮发电机
端部磁场
定子铁心
有限元法
hydraulic generators
end zone field
stator core
variation
finite element method(FEM)
