汽轮发电机转子铁心表面电磁力分布的实例研究  

A CASE STUDY OF ELECTROMAGNETIC FORCE DISTRIBUTION ON ROTOR CORE SURFACE OF TURBOGENERATOR

作　　者：蒙亮[1] 罗应立[1] 刘晓芳[1] 杨金福[1] 池永斌 

机构地区：[1]华北电力大学,北京市昌平区102206 [2]黑龙江省电力科学研究院,黑龙江省哈尔滨市150030

出　　处：《中国电机工程学报》2005年第1期81-86,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50277011)。~~

摘　　要：该文为配合某大型汽轮发电机转子裂纹原因分析,对其额定运行工况时电磁力在转子铁心表面的分布状况进行了全面研究。首先通过有限元计算得到转子横截面上磁场的精确分布,进而基于麦克斯韦应力方法,采用考虑饱和等多种因素影响的一个新的公式,获得了空气/铁心界面上的磁应力分布。该文揭示了磁场力在转子截面上严重的非均匀分布状况,指出大齿后侧第一、二齿是磁场力高度集中的部位其齿侧面所受磁应力达到平均值的 2.5 倍。该文的研究结果有助于更全面地分析转子体裂纹故障的产生原因,并可能为进一步改进转子体的结构提供参考。The electromagnetic force distribution on the rotor core surface of a turbo-generator under rated operating condition is studied in this paper, in order to find the cause of cracks on the rotor body. Firstly, an accurate distribution of the magnetic field on rotor cross section is obtained by mean of FEM. Secondly, magnetic stress distribution on air/core interfaces is obtained via a new formula considering the saturation effect, based on Maxwell Stress Method. The paper discovers a phenomenon of highly uneven distribution of magnetic stress on the rotor core cross section. It shows that the force highly concentrates on the first two teeth next to the big tooth, with a tooth-side stress 2.5 times of the average. The results help to analyze more thoroughly the formation of cracks on rotor body and to provide possible improvements of the rotor structures.

关 键 词：转子铁心 大型汽轮发电机 电磁力 饱和 磁场力 平均值 运行工况 表面 横截面 麦克斯韦 

分 类 号：TM311[电气工程—电机] TM32