摘要
为了提高贴片式旋转-直线超声电机压电片的利用效率,简化电机使用过程中的安装与固定,提出了一种新颖的贴片式旋转-直线超声电机。样机主要利用自由约束柱状定子空间上相互正交的二阶弯曲振动模态耦合,在定子自由端的内表面合成一个驱动行波,通过螺纹传动实现输出轴的旋转-直线运动输出。基于有限元法对定子的振动模态以及压电片的激振模式进行了仿真分析,研制出一台定子采用中空方柱型结构的原型样机。搭建了一套基于虚拟仪器技术的超声电机测试系统,完成了样机基本输出特性的测试。测试结果表明样机工作频率为38.90 kHz,驱动电压峰峰值20 V时即可实现样机的有效驱动。
To improve the utilizing efficiency of PZT plates and simplify the fixing in the application of ultrasonic motor,a novel plate-attached rotary-linear ultrasonic motor was proposed.For the prototype,the second bending vibration modes of a hollow cylindrical stator were excited orthogonally both in time and space.And a traveling wave was synthesized in the free end of stator.The output shaft was driven by the traveling wave to move in a rotary-linear motion through the screw thread.The bending vibration mode of stator and excitation mode of PZT plates were simulated by finite element method.And then a prototype was developed,whose stator adopts a hollow square column structure.A testing system based on virtual instrument was established and the basic output characteristics of prototype were tested.Testing results indicate that the resonant frequency of the prototype is 38.90 kHz,and can be driven availably under a peak-peak value of 20 V.
出处
《电机与控制学报》
EI
CSCD
北大核心
2013年第3期8-12,共5页
Electric Machines and Control
基金
国家自然科学基金(51075080)
关键词
超声电机
旋转-直线运动
弯曲振动
行波
虚拟仪器
ultrasonic motors
rotary-linear motion
bending vibration
traveling wave
virtual instrument
