关键词: 并联机床, 刚度变化率, 静刚度, 电动/发电机, 混合动力汽车, 开关磁通电机, 有限元分析

Abstract: The stiffness of a 4-DOF hybrid machine tools is analyzed and evaluated based on the stiffness analysis of column and leg substructures. The results show that the bearing stiffness is the weakest factor and the stiffness in x direction changes rapidly which goes against steady machining precision. The concept of stiffness variety is given and the analysis of factors of stiffness variety in x direction is presented. And the optimization designs are accomplished aimed at stiffness variety, it provides theoretical reliance for optimization and design of stiffness of machine tools.

Key words: Parallel machine tools, Stiffness, Stiffness variety, FEA, Flux Switching Machine, Motor/Generator, Hybrid electric vehicle