超声波电机定子质点幅频特性研究

摘要

The ultrasonic motor stator for engineering application is the object of study in this paper. The effect of the vibration characteristic on the rotor rotation of the ultrasonic motor stator is studied,the stator e-lectromechanical coupling model is established, using the finite element method the electromechanical cou-pling model is solved, model shape and corresponding frequencies of the stator are obtained, working fre-quency select B09modal frequency. The inverse piezoelectric effect of piezoelectric creamic is studied, the stator elastomer modal response under electrical excitation is obtained,and the stator modal experiment is de-signed,conclusion compared with the results of simulation experimental find:The practical work of the stator frequency is large than theoretical work frequency around 230Hz,the error of about 0.7%,the experimental results verify the correctness of the simulation results. actual working frequency corresponding to the vibration amplitude is smaller than theoretical work frequency corresponding to the vibration amplitude of 0.03 μm,the error of about 21%,the results of the experiment are different from the simulation results. The results of the experiment and the simulation results are great significance to the design of ultrasonic motor.%以工程应用的超声波电机定子为研究对象,研究了定子表面质点反压电陶瓷作用下起振特性对转子转动的影响,建立了定子机电耦合模型,采用有限元法对机电耦合模型进行求解,得到定子各阶模态频率及对应的振型.选取B09模态频率为工作频率,对压电陶瓷逆压电效应进行研究,得到电信号激励下定子弹性体的响应振型以及幅频特性;并设计定子模态实验,实验结论与仿真结果对比发现:定子实际工作频率比理论工作频率大230 Hz左右,误差约为0.7%,实验结论验证了仿真结果的正确性,实际工作频率对应的振动幅值比理论工作频率对应的的振动幅值小0.03 μm,误差约为21%,有一定差距,实验结论与仿真结果对比分析对超声波电机定子设计具有重要的指导意义.