发电机在不同气隙偏心故障下的转子多向受力分析

发布时间：2018-06-24 01:55

  本文选题：发电机 + 气隙偏心　； 参考：《华北电力大学》2017年硕士论文

【摘要】：本文以SDF-9型故障模拟发电机为研究对象,对发电机正常运行、气隙径向静偏心故障、气隙轴向静偏心故障、气隙径向动偏心故障,以及气隙径向复合偏心故障下转子在不同方向上的磁拉力特性进行了分析。论文所做的主要工作和取得的成果如下:(1)理论推导得到了发电机转子在正常运行及气隙径向静偏心、动偏心、动静复合偏心故障下的转子径向不平衡磁拉力通用解析表达式,气隙轴向静偏心故障下的转子轴向不平衡磁拉力及切向电磁转矩的通用解析表达式,并分析得到了转子不平衡磁拉力的特征频率成分及幅值与不同类型、不同程度气隙偏心故障的对应关系;(2)在通用电机有限元计算软件Ansoft平台上建立了SDF-9型故障模拟发电机正常运行和四种不同类型气隙偏心故障所对应的物理求解模型和耦合电路模型,计算得到了不同运行状态下转子各向磁拉力的时域波形及其频谱;(3)在实验室SDF-9型7.5k W故障模拟发电机上完成了正常运行及气隙径向静偏心故障下转子不平衡磁拉力激励导致的径向振动响应特性验证,同时结合韩国汉阳大学五对极1600k W实验机组气隙轴向静偏心下的轴向磁拉力数据和韩国蔚山大学1.5k W无刷直流电机气隙径向动偏心故障下的定子电流频谱数据,与理论分析和有限元数值计算结果进行了对比,结果一致;(4)提出关键特征频率成分进行比对的方法来分别区分各类静偏心故障和动偏心故障,并归纳出不同气隙偏心故障类别对不平衡磁拉力影响的敏感程度。论文成果对于在现有基础上提高发电机在气隙静偏心、气隙动偏心以及气隙复合偏心故障下的诊断精度提供了理论参考和应用基础。
[Abstract]:In this paper, the SDF-9 fault simulation generator is taken as the research object. For the normal operation of the generator, the air gap radial static eccentricity fault, the air gap axial static eccentricity fault, the air gap radial dynamic eccentricity fault. The magnetic pull characteristics of the rotor in different directions under the radial composite eccentric fault of the air gap are analyzed. The main work and achievements are as follows: (1) the general analytical expressions of rotor radial unbalance magnetic pull force under normal operation, radial eccentricity of air gap and composite eccentricity are derived theoretically. The general analytical expressions of rotor axial unbalanced magnetic pull force and tangential electromagnetic torque under axial eccentricity fault of air gap are obtained. The characteristic frequency components and amplitude of rotor unbalanced magnetic pull force and different types of rotor unbalance magnetic pull force are obtained. (2) the physical solution model of SDF-9 fault simulation generator in normal operation and four different types of air gap eccentric fault is established on the platform of general motor finite element calculation software Ansoft. And coupled circuit models, The time-domain waveform and its frequency spectrum of rotor magnetic pull forces in different operating conditions are obtained. (3) the rotor unbalanced magnetic pull is completed on the laboratory SDF-9 7.5kW fault simulation generator under the condition of normal operation and static eccentricity fault of air gap radial direction. Verification of radial vibration response caused by force excitation, At the same time, the data of axial magnetic pull force under axial eccentricity of air gap and stator current spectrum data of 1.5kW brushless DC motor under radial eccentricity fault of air gap are combined with 1600kW experimental set of five pairs of poles in Hanyang University, Korea. The results are consistent with the theoretical analysis and finite element numerical results. (4) A method of comparing the key characteristic frequency components is proposed to distinguish the static eccentricity faults from the dynamic eccentricity faults respectively. The sensitivity of different air gap eccentricity fault types to unbalanced magnetic pull force is concluded. The results of this paper provide a theoretical reference and application basis for improving the diagnostic accuracy of generator under the condition of static eccentricity of air gap, dynamic eccentricity of air gap and composite eccentricity of air gap.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM31

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