不同种类气隙偏心故障对汽轮发电机转子不平衡磁拉力的影响

发布时间：2018-01-20 05:16

本文关键词： 汽轮发电机气隙偏心不平衡磁拉力振动特性　出处：《振动与冲击》2017年15期 　论文类型：期刊论文

【摘要】：结合理论推导和数值仿真计算分析了径向气隙偏心对汽轮发电机转子径向不平衡磁拉力及其振动特性的影响。首先通过分析气隙静偏心、气隙动偏心以及气隙动静混合偏心情况下气隙磁场的变化,分别推导得到不同气隙偏心所引起的转子径向不平衡磁拉力表达式,并分析了转子的振动特征,然后利用电机有限元软件Ansoft Maxwell建立了实验室SDF-9型隐极故障模拟发电机的二维模型,计算得到了转子水平及竖直方向的径向不平衡磁拉力变化情况,并与理论分析和部分实验振动响应进行了对比,结果基本吻合。结果表明,气隙静偏心将产生二倍频不平衡磁拉力作用于转子上;气隙动偏心根据转子表面凹凸数量分为合外力为零及合外力不为零两种情况,当合外力不为零时,将产生一倍频不平衡磁拉力作用于转子;气隙动静混合偏心将同时产生一倍频和二倍频不平衡磁拉力作用于转子上(考虑动偏心时合外力不为零的情况)。同时随着偏心程度的增大,不平衡磁拉力也随之增大。
[Abstract]:The influence of radial air gap eccentricity on the radial unbalance magnetic pull force and its vibration characteristics of turbogenerator rotor is analyzed by theoretical derivation and numerical simulation. Firstly, the static eccentricity of air gap is analyzed. Under the condition of dynamic eccentricity of air gap and mixed eccentricity of air gap, the expressions of radial unbalance magnetic pull force caused by different eccentricity of air gap are derived, and the vibration characteristics of rotor are analyzed. Then, the two-dimensional model of SDF-9 generator is established by using the finite element software Ansoft Maxwell. The radial unbalanced magnetic tension in horizontal and vertical direction of the rotor is calculated and compared with the theoretical analysis and some experimental vibration responses. The results are in good agreement with each other. The static eccentricity of air gap will produce the double frequency unbalanced magnetic pull force acting on the rotor. The eccentricity of air gap is divided into two situations according to the number of concave and convex on the surface of rotor: the external force is zero and the external force is not zero. When the external force is less than 00:00, the double frequency unbalanced magnetic pull force will be produced on the rotor. The mixed eccentricity of air gap and static and static will produce both double frequency and double frequency unbalanced magnetic pull force on the rotor (considering the case that the external force is not zero when the dynamic eccentricity is considered). At the same time, with the increase of eccentricity degree. The unbalanced magnetic pull also increases.
【作者单位】：华北电力大学机械工程系;
【基金】：国家自然科学基金(51307058) 河北省自然科学基金(E2014502052;E2015502013) 中央高校基本科研业务费专项基金重点项目(2015ZD27)
【分类号】：TM311
【正文快照】： 由于制造、装配和运行等多种原因,电机定转子间的气隙经常会存在一定程度的不均匀,造成气隙在一侧多,而在另一侧少的情况,此种现象称之为气隙偏心,例如导轴承偏移、定子铁芯变形等都会导致气隙偏心故障的产生。目前通常所说的气隙偏心大多是指径向偏心[1-6]。气隙偏心根据偏心

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