汽轮发电机气隙偏心故障下的定子受力分析
Turbo-Generator Stator Force Analysis under Air-Gap Eccentricity Fault
何玉灵 1张伯麟 1仲昊 1万书亭 1唐贵基1
作者信息
- 1. 华北电力大学机械工程系,河北保定071003
- 折叠
摘要
本文对汽轮发电机气隙偏心故障前后的定子受力进行了理论分析、有限元仿真计算和力学响应验证.首先对气隙偏心故障前后的定子单位面积磁拉力进行了理论分析,得到了磁拉力的主要频率成分和激励特性;然后在电机有限元软件Ansoft中建立了正常及气隙偏心故障的汽轮发电机求解模型,计算得到了正常及故障下定子单位面积磁拉力的时域波形及频谱图;最后,将实验室SDF-9型故障模拟发电机上测取的气隙偏心故障下定子振动响应与磁拉力理论解析公式、有限元仿真数据进行了对比,结果基本一致.分析表明:正常情况及气隙偏心故障下发电机定子主要承受直流力和二倍频磁拉力,气隙偏心故障将使定子直流力与二倍频磁拉力均增大,偏心程度越大,幅值增长越明显,对应地,定子二倍频振动越剧烈.
Abstract
In this thesis,theoretical analysis,finite element (FE) simulation,and mechanics response verification are carried out to study the magnetic pull on stator under air-gap eccentricity fault.Firstly,the frequency components and exciting characteristics of the magnetic pull on the stator is obtained by means of qualitative analysis of the force formula.Then,the FE models respectively for normal condition and air-gap eccentricity fault are established in common FE software Ansoft to simulate time-domain waves and spectra of the magnetic pull per unit area (MPPUA) acting on the stator.Finally,experimental stator vibration is employed to make a comparison with the theoretical formulas and the simulated magnetic pull data,gaining a basically consistent result.It is shown that,the stator primarily endures a DC force and a 2nd harmonic magnetic pull both in normal condition and the air-gap eccentrieity case.However,the occurrence of the air-gap eccentricity will increase both DC force and 2rid harmonic force,as well as 2rid vibration amplitude.
关键词
汽轮发电机/气隙偏心/单位面积磁拉力/定子振动/Ansoft/有限元分析Key words
turbo-generator/air-gap eccentricity/magnetic pull per unit area(MPPUA)/stator vibration/Ansoft/finite element analysis引用本文复制引用
基金项目
国家自然科学基金(51307058)
河北省自然科学基金(E2015502013)
中央高校科研业务费专项基金重点项目(2015ZD27)
出版年
2017
NETL
NSTL
维普
万方数据