【作者】 韩伟；

【导师】 贾启芬；

【作者基本信息】 天津大学 ， 一般力学与力学基础， 2012， 硕士

【摘要】 随着异步电机在国民经济发展过程中的广泛应用,异步电机系统的结构越来越复杂。异步电机的广泛应用使得电机的振动与噪声问题更加突出和重要。本文利用有限元商业软件ANSYS对异步电机进行了振动模态分析,详细研究了定子、转子和定转子耦合系统的振动特性,计算结果与实验结果进行了对比验证。本文的研究内容和成果主要有以下几个方面。(1)简述了电动机的发展历史和基本知识,以及应用过程中存在的主要问题,最后介绍了关于异步电机振动特性的研究现状和存在的主要问题。(2)利用有限元方法求解了自由和约束两种边界条件下定子的固有频率和振型,详细探讨了不同有限元建模方法对定子固有频率的影响。研究表明在建立定子的有限元模型时应该全面考虑底脚、散热筋和加强筋、铁芯的离散特性、端盖约束对固有频率的影响。同时,对样机定子的结构设计提出了改进措施。(3)利用有限元方法求解了自由和约束边界条件下转子系统的固有频率和振型,研究了轴承刚度和转子铁芯弹性模量取值对转子固有频率的影响,研究表明轴承刚度和转子铁芯弹性模量对转子的固有频率影响较大。同时,对样机转子的结构设计提出了改进措施。(4)利用有限元方法求解了约束边界条件下定转子耦合系统的固有频率和振型,研究了轴承刚度和定转子耦合方式对系统固有频率的影响,研究表明轴承刚度和定转子耦合方式对系统的固有频率影响较大。同时,对异步电机样机的设计提出了改进措施。更多还原

【Abstract】 With the induction motor being widely used in the development of national economy, structure of induction motor system is more and more complex . Vibration and noise problems becomes more prominent and important with the induction motor being widely used. Modal analysis on motor have been done by FEM business software. vibration behavior of stator、rotor and stator - rotor coupled system have been detailed studied. Comparison of calculation results and experimental results are verified. Major work and results obtained are as follows.(1) Basic knowledge and the history of the motor is brief described, main problems existing in the application process is also brief described. Present situation and major problem of study on vibration characteristics of induction motor is also described.(2) Natural frequency and vibration mode of free and constraint stator are computed by FEM. The effect of different finite element modeling methods on natural frequency is studied. Studies show that the effect of radiating ribs and enhanced ribs and feet on mode shapes and the influence of laminated on natural frequency should be investigated systematically when we construct finite element model of motor. The improvement measures on the design of the stator is posed.(3) Natural frequency and vibration mode of free and constraint rotor are computed by FEM. The effect of bearing stiffness and rigidity of the rotor core on natural frequency is studied. Studies show that bearing stiffness and rigidity of the rotor core have a great effect on natural frequency. The improvement measures on the design of the rotor is posed.(4) Natural frequency and vibration mode of free and constraint stator - rotor coupled system are computed by FEM. The effect of bearing stiffness and stator - rotor coupling methods on natural frequency is studied. Studies show that bearing stiffness and stator - rotor coupling methods have a great effect on natural frequency. The improvement measures on the design of the motor is posed.更多还原