汽轮发电机定子绕组端部电磁力特性分析.pdf

第39卷第6期
华北电力大学学报
Vol 39
2012年11月
Journal of North China Electric Power University
2012
汽轮发电机定子绕组端部电磁力特性分析
万书亭,姚肖方,朱建斌
(1.华北电力大学能源动力与机械工程学院,河北保定071003;
2.中核集团海南核电有限公司,海南海口570100
摘要:以国产600MW大型汽轮发电机端部结构为分析对象,对定子绕组端部的受力特性进行了理论研究。
首先对端部结构迸行简化,建立了定子绕组端部的数学模型,并利用镜像法和比奥一萨格尔定律计算得到了
端部电磁力密度,给出了单根缄棒上电磁力表达式的通式。然后分别比较了相差一个极距的同层线棒、同
定子槽中的上下层线棒、相差一个节距且鼻端相连的两根线棒等不同线棒之间以及线棒不同段之间的径向、
切向、轴向电磁力密度。最后分析了同一相带内的同层线棒在同一时刻的电磁力密度变化趋势,并总结了其
现极值点的位置规律,所得分析结果对线棒的绑扎固定有一定的理论指导意义。
关词:汽轮发电机;定子绕组端部;电磁力;绑扎
中图分类号:TM311文献标识码:A文章编号:1007-2691(2012)06-0007-06
Analysis on electromagnetic force characteristic of
stator end windings in turbo-generator
WAN Shu-ting YAO Xiao-fang, ZHU Jian-bin
(1. School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, Chin
2. CNNC Hainan Nuclear Power Co. Ltd. Hainan 570100, China)
Abstract: Theoretical research on the force on end windings are conducted for the end structure of a 600MW home-
made turbo-generator. After the simplification on the end structure, the stator end windings'mathematical model was es-
tablished, and the electromagnetic forces density of the end windings were computed by image method and the Biol-sa
vart Law method, and the electromagnetic forces expression of a single bar were obtained. Then the radical, peripheral
and axial electromagnetic forces density in different bars among same layer, bars between a pole pitch, adverse layer
bars in the same stator slot, two bars linked by the end between a pitch, and different segments of a bar were compared
respectively. Finally the electromagnetic forces' change trends of the bars in the same layer and same phase belt were
analyzed, and the laws of the extreme value location were gotten, which can provide theoretical advising for the bind-
ing of the end winding bars
Key words: turbo-generator; stator end winding; electromagnetic forces; binding
此大型发电机的安全运行对整个电网的安全、稳
0引
定至关重要。汽轮发电机定子绕组端部因其固定
比较薄弱成为关乎发电机安全稳定运行的重要环
随着科技的进步,以及制造和电网稳定运行节,随着发电机单机容量的増大,作用在定子绕
水平的不断提高,发电机单机容量不断增加,因组端部的电磁力也随之増加1-2,由此引发的振
动问题也日益受到重视。因此,为了准确掌握汽
轮发电机端部的振动情况,研究发电机端部绕组
收稿日期:2012-05-15.
电磁力有很大的意义。
甚金项目:国家自然科学基金资助项目(51177046);河北省自
然科学基金资助项目(E2011502024)
端部绕组不仅承受着自身在漏磁场中的电磁