“工字形”直线超声电机的结构设计与模态分析

Structural Design and Modal Analysis of Gong-shaped Linear Ultrasonic Motor

为了提高直线超声电机的输出性能,研制了纵弯复合模态“工字形”直线超声电机,对“工字形”弹性体的几种复合振动模态及其驱动方案进行了分析,确定了振子的工作模态。完成了“工字形”振子的结构设计,利用Ansys软件对“工字形”压电振子进行了优化设计,确定了定子各结构参数。纵向伸缩振动模态固有频率和弯曲振动模态固有频率分别为33.07kHz和33.08kHz,频率差8Hz。根据优化设计结果,试制了原理样机。对样机的输出性能进行了实验研究。实验结果表明:当驱动频率为31.10 kHz,激励电压峰峰值为250V时,电机动子Vmax为240mm/s;驱动力Fmax为0.5N。

In order to improve the output performance of linear ultrasonic motor,a longitudinal-bending composite mode“gong-shaped”linear ultrasonic motor was developed.Several complex vibration modes of“gong-shaped”elastomer and their driving schemes were analyzed,and the working modes of the oscillator were determined.The structural design of the“gong-shaped”piezoelectric oscillator was completed.The optimum design of the“gong-shaped”piezoelectric oscillator was carried out by using Ansys software,and the structural parameters of the stator were determined.The natural frequencies of longitudinal and flexural modes are 33.07 kHz and 33.08 kHz,respectively,with a frequency difference of 8 Hz.According to the results of optimization design,a prototype of the principle was trial-produced.The output performance of the prototype was experimentally studied.The experimental results show that when the driving frequency is 31.10 kHz,the peak value of excitation voltage is 250V,the Vmax of the motor is 240mm/s and the driving force Fmax is 0.5N.