Effect of laminated core on rotor mode shape of large high speed induction motor
Effect of laminated core on rotor mode shape of large high speed induction motor
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DOI：
10.1109/iemdc.2011.5994842
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
S. Singhal;K. V. Singh;A. Hyder
中科院分区：
文献类型：
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作者：
S. Singhal;K. V. Singh;A. Hyder
电动机是许多工业过程的支柱，但它消耗了很大一部分能源。不断增加的能源成本促使人们转向更高效率的系统。大型高速异步电动机运行在具有柔性转子动力学设计的变频驱动器上，通常需要对其模态特性（固有频率、振型）和临界转速进行准确预测。大型感应电动机的转子结构是由铁磁钢制成的叠片铁芯组成，这改变了转子系统的整体刚度，从而影响其模态特性。本文的目的是研究叠片铁芯对转子模态振型的影响。为此，对轴和安装在轴上的转子铁芯进行了实验模态分析。对提取的模态进行了研究，并进行了相应的有限元模态分析。结果表明，轴的模态特性是显着不同的转子芯，因为它会导致系统的刚化，也影响节点的位置。提出了从振型特征识别堆芯刚度的初步分析。根据辨识出的参数进行转子动力学分析，计算临界转速。核心刚度在临界转速沿着从现场测试的观察结果的影响是突出的，并计划为今后的研究源于这项工作进行了总结。
Electric motors is the backbone of many industrial process, however it consumes of large portion of energy. Increasing energy costs create incentives for movement toward higher efficiency systems. Large high speed induction motors which are operating on variable frequency drives with flexible rotor dynamic designs are often required to have an accurate prediction of its modal characteristics (natural frequencies, mode shapes) and its critical speed. The construction of rotors for large induction motors consists of laminated core made of Ferro-magnetic steel, which alters the overall rotor system stiffness and hence influences its modal characteristics. The aim of this paper is to investigate the effects of laminated core on the rotor mode shapes. To this end, experimental modal analysis was carried out for shaft and for rotor core mounted on shaft. The extracted modes were studied and the associated Finite Element modal analysis was carried out. It is shown that the modal characteristics of the shaft are significantly different from the rotor core as it leads to stiffening of the system and also influences the location of nodes. Preliminary analysis for identifying the core stiffness from its modal characteristics is presented. Based upon the identified parameters rotor-dynamic analysis is performed for critical speed calculation. The effect of core stiffness in critical speeds along with the observations from field testing is highlighted and the plans for future research originating from this work are summarized.