单边磁拉力对大型感应电机转子临界转速的影响分析  被引量:2

Analysis of Effect of Unbalanced Magnetic Pull on Rotor Critical Speed of Large Asynchronous Motor

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作  者:孟大伟[1] 施道龙 于喜伟[1] 刘慧敏[1] 

机构地区:[1]哈尔滨理工大学电气与电子工程学院,哈尔滨150080

出  处:《大电机技术》2015年第6期15-19,共5页Large Electric Machine and Hydraulic Turbine

摘  要:以11k V、20极6500k W大型三相感应电机为例,研究单边磁拉力对大容量低速电机转子振动的影响。采用有限元法计算出转子的单边磁拉力;运用软件ARMD(Advanced Rotating Machinery Dynamics)建立了该大型三相感应电机转子动力学模型;以对模型是否填加单边磁拉力作为边界条件,分别计算得出转子前三阶固有频率。通过对比分析数值计算结果可知,单边磁拉力的存在会使转子固有频率降低,而增大轴承支承刚度有利于消除这一影响。由此为大型感应电机转轴机械设计进而提高其运行性能及可靠性,提供了理论依据。Taking the 11 k V-20p-6500 k W large-scale three-phase asynchronous motor as an example, the influence of unbalanced magnetic pull on the vibration of rotor is analyzed. The method FEM is used to calculate the unbalanced magnetic pull of rotor. The dynamic model of rotor in this large-scale three-phase asynchronous motor is established using the software of ARMD. The first three orders of nature frequency of rotor are obtained with the boundary condition of whether the unbalanced magnetic pull is applied in model or not. Through the compare and analysis of the calculation results, the unbalanced magnetic pull is proved to reduce natural frequency of rotor, and the increase of stiffness of bearing support is beneficial to eliminate this impact. The results of this paper provide the theoretical foundation for the mechanical design of shaft of the large-scale three-phase asynchronous motor, and then improve the working performance.

关 键 词:有限元法 单边磁拉力 ARMD 转子动力学 固有频率 

分 类 号:TM346[电气工程—电机]

 

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