基于ANSYS Workbench的磨削用电主轴转子动力学特性研究

Research on Dynamic Characteristics of Grinding Electric Spindle Rotor Based on ANSYS Workbench

电主轴是将电机与主轴融为一体的新技术,相比传统主轴它具有更高的精度、转速与功率。为了开发性能更加优良的电主轴,在设计环节需要通过转子动力学方法验算出极限转速,从而提高其寿命和加工性能。目前行业上广泛采用的是刚性梁假设的转子动力学方程组,来求解轴系的动态特性,该方法未能充分考虑到模型的所有自由度导致不能充分测算出主轴的性能。针对于此,本文提出了一种采用仿真软件结合轴承理论的方法,在ANSYS Workbench软件中搭建主轴的网格模型,分析了主轴的刚度、极限转速与模态频率,并与试验结果进行验证。结果表明,仿真结果误差较小,该方法具有有效性与实用性。

Motorized spindle is a new technology that integrates motor and spindle,which has higher accuracy,speed,and power than traditional spindles.In order to develop a new spindle with higher-performance,it is necessary to use rotor dynamics methods to calculate the limiting speed of spindle during the design phase,which will improve its life and performance.At present,technicians widely use rotor dynamics equations based on rigid beam assumption to solve the dynamic characteristics of spindle.This method is unable to fully consider all the degrees of freedom of the model,resulting in insufficient estimating of the spindle performance.In response to this,this paper proposes a method that combines simulation software with bearing theory to build a grid model of the spindle in ANSYS Workbench software.The stiffness,limiting speed,and modal frequency of the spindle are analyzed,and compared with experimental results.The results indicate that the error between simulation results and experiment results is small,which has demonstrated the effectiveness and practicality of this method.