偏心电主轴动力学分析

为了揭示偏心状态下高速电主轴的动力学行为,从高速电主轴的结构特征出发,应用有限元法对其进行动力学分析,建立了高速电主轴动力学分析模型;基于电磁学和机械系统动力学基本理论,建立了各种偏心状态下高速电主轴的广义不平衡力表达式,根据所建动力学模型可以获得高速电主轴在不同预加载荷、轴承配置下的固有频率和不平衡响应等动态特性。将120MD60Y6型电主轴的机电结构参数代入模型,并利用Matlab/Simulink软件进行仿真分析,计算所得的数据与实验所测数据相符,从而证明所建模型是正确的。

Dynamic analysis of high speed motorized spindles with eccentrics

In order to study dynamic behaviors of high speed motorized spindles under different eccentric conditions,the dynamics of high speed motorized spindles is analyzed by using finite element method on the basis of its structure,and an analytical dynamic model of high speed motorized spindles is established. Based on electromagnetism and mechanical system dynamics,expressions of general unbalanced force of high speed motorized spindles are established. Thus,dynamic characteristics of spindles,such as natural frequencies and unbalance response,can be obtained from the proposed model while spindles have different preloads and bearing configurations. The parameters of a 120MD60Y6 motorized spindle are substituted into the model and a simulation is carried out by Matlab/Simulink. The result shows good agreement with the data obtained from experimental modal analysis,which proves that the proposed model is correct.