发电机气隙静态偏心对电磁转矩的影响
发布时间：2019-04-27 14:08
【摘要】：针对发电机气隙静态偏心前后的电磁转矩特征进行了理论分析、仿真计算和动模实验验证。首先,对发电机气隙静态偏心前后的电磁转矩进行了理论推导,得到了两种运行状态下电磁转矩的具体表达式;然后,分别应用Matlab和有限元软件Ansoft针对实验室MJF-30-6型动模机组的具体参数进行了数值计算和建模仿真,并将所得结果与实验数据进行了对比,三者基本吻合。分析表明:气隙静偏心将引发电磁转矩产生二倍频波动,同时将使电磁转矩的平均值有所增大,但鉴于气隙偏心的数值较小,其增幅很小;随着静偏心程度的加剧,电磁转矩的二倍频波动程度将加剧,同时平均值增幅将扩大。本成果可在现有基础上丰富气隙静偏心故障的诊断判据,为该故障的监测与控制提供方便。
[Abstract]:The characteristics of electromagnetic torque before and after static eccentricity of generator air gap are theoretically analyzed, simulated and verified by dynamic model experiments. Firstly, the electromagnetic torque before and after static eccentricity of generator air gap is deduced theoretically, and the specific expressions of electromagnetic torque under two operating states are obtained. Then, the numerical calculation, modeling and simulation of the specific parameters of the laboratory MJF-30- 6 dynamic model unit are carried out by using Matlab and finite element software Ansoft, respectively. The results are compared with the experimental data, and the results are basically in agreement with the experimental data. The analysis shows that static eccentricity of air gap will cause double frequency fluctuation of electromagnetic torque and increase the average value of electromagnetic torque, but the increase of air gap eccentricity is very small because of the smaller value of air gap eccentricity. With the aggravation of static eccentricity, the fluctuation degree of the second harmonic frequency of electromagnetic torque will be intensified, and the increase of average value will be enlarged. The results can enrich the diagnosis criterion of air gap static eccentricity fault and provide convenience for monitoring and control of the fault.
【作者单位】： 华北电力大学机械工程系;华北电力大学电力工程系;
【基金】：国家自然科学基金资助项目(51307058) 河北省自然科学基金资助项目(E2014502052,E2015502013) 中央高校科研业务费专项基金资助项目(2015ZD27)
【分类号】：TM31
本文编号：2467041
[Abstract]:The characteristics of electromagnetic torque before and after static eccentricity of generator air gap are theoretically analyzed, simulated and verified by dynamic model experiments. Firstly, the electromagnetic torque before and after static eccentricity of generator air gap is deduced theoretically, and the specific expressions of electromagnetic torque under two operating states are obtained. Then, the numerical calculation, modeling and simulation of the specific parameters of the laboratory MJF-30- 6 dynamic model unit are carried out by using Matlab and finite element software Ansoft, respectively. The results are compared with the experimental data, and the results are basically in agreement with the experimental data. The analysis shows that static eccentricity of air gap will cause double frequency fluctuation of electromagnetic torque and increase the average value of electromagnetic torque, but the increase of air gap eccentricity is very small because of the smaller value of air gap eccentricity. With the aggravation of static eccentricity, the fluctuation degree of the second harmonic frequency of electromagnetic torque will be intensified, and the increase of average value will be enlarged. The results can enrich the diagnosis criterion of air gap static eccentricity fault and provide convenience for monitoring and control of the fault.
【作者单位】： 华北电力大学机械工程系;华北电力大学电力工程系;
【基金】：国家自然科学基金资助项目(51307058) 河北省自然科学基金资助项目(E2014502052,E2015502013) 中央高校科研业务费专项基金资助项目(2015ZD27)
【分类号】：TM31
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