摘要
端部结构参数对大型汽轮发电机的漏磁和涡流损耗有较大影响。以1 550 MW半速核能发电机为研究对象,采用三维时步有限元法,综合考虑材料非线性、转子旋转以及发电机端部实际三维结构等因素,对发电机端部漏磁及端部构件上的涡流损耗进行计算研究。分别改变屏蔽层厚度、定转子端部铁心相对长度、定子端部绕组直线段长度以及端部铁心阶梯高等结构参数,计算相应的端部漏磁和涡流损耗,通过对计算结果的分析,得出不同结构参数对端部漏磁和涡流损耗大小及分布的影响规律。所得结论为减小发电机端部漏磁及涡流损耗,优化端部漏磁及涡流损耗分布提供依据。
End structure have great influence on the leakage magnetic field and eddy current loss in large turbo generators. Taking a 1 550 MW half-speed nuclear generator for object, adopting time-step three-dimension finite-element method, taking material nonlinearity, rotor rotation, and the actual three-dimensional structure of the end region, leakage magnetic field in end region and eddy current loss on end components were calculated and studied. Copper shield thickness, relative length of stator core and rotor core, length of end stator winding linear part and height of ladder part were changed respectively, corresponding leakage magnetic field and eddy current loss were calculated. Through the analysis of the calculation results, the influence of different structural parameters on leakage magnetic field and eddy current loss in the end region is obtained. The conclusions can be references for reducing the leakage magnetic field and eddy current loss and optimizing the magnetic leakage and eddy current loss in the end region. © 2016 Chin. Soc. for Elec. Eng.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2016年第S1期200-205,共6页
Proceedings of the CSEE
基金
国家自然科学基金项目(51477015)
重庆市科技攻关计划项目(cstc2012gg-yyjs B90005)
Project Supported by National Natural Science Foundation of China(51477015)
The Key Technologies Research and Development Program of Chongqing(cstc2012gg-yyjs B90005)
关键词
核能发电机
端部结构参数
漏磁场
涡流损耗
Electric generators
Finite element method
Magnetic fields
Magnetic leakage
Magnetism
Stators
Turbogenerators
