强离心场下旋转型行波超声电机定子动力学分析与试验

Dynamic analysis and experiment study on the stator of a travelling wave type rotary ultrasonic motor in centrifugal field

研究了强离心场下旋转型行波超声电机定子的动力学特性,分析了离心刚化效应对定子的影响。通过计算离心力做的功(或称为离心势能)推导出因离心刚化效应引起的附加刚度矩阵,进而得到强离心场下定子的特性矩阵(包括质量矩阵和刚度矩阵),求解得到定子的模态参数;并根据压电陶瓷的孤极区反馈的电压信号,确定了高旋环境下定子的固有频率;总结了强离心场下超声电机定子动力学特性变化规律,给出了高旋环境下超声电机的驱动控制应对策略,为高旋环境下超声电机的应用奠定基础。

The dynamic analysis on the stator of a travelling wave type rotary ultrasonic motor in centrifugal field was carried out,and the effect of centrifugal stiffening on the stator was analyzed.The additional stiffness matrix caused by the effect of centrifugal stiffening was deduced by calculating the work done by the centrifugal force(or called centrifugal potential energy),and the characteristic matrices(including mass matrix and stiffness matrix)of the stator in centrifugal field as well as the modal parameters of the stator were obtained.Based on the voltage signal fed back from the soliton region of piezoelectric ceramics,the natural frequency of the stator in high rotation environment was determined.Finally,the dynamic characteristics of the stator in centrifugal field were summarized,and the driving strategy of the ultrasonic motor in the high rotation environment was proposed,which lays the foundation for the application of the ultrasonic motor in high rotation environment.