用于机床进给系统的双向驻波直线超声电机

近年来超声电机在机床进给系统中的应用越来越广泛，针对于传统贴片式驻波型超声电机效率低，功率小，不利于在进给系统中应用的现状，文章提出一种利用夹心式弯振换能器的激励弯曲驻波的驻波直线超声电机。运用振动理论分析了电机的致动原理：通过激励两种不同谐振频率的弯曲驻波，并结合驱动齿的合理分布，可实现双向运动。采用有限元法确定其具体结构尺寸，并验证了各驱动齿端部振动轨迹为倾向一致的斜线。制作了样机并测定了其机械输出特性，达到如下指标：最大推力14N，最高速度180mm／s。

A Bidirectional Standing Wave Ultrasonic Linear Motor for Feeding System of Machine Tools

Ultrasonic motors have been applied in feeding system of machine tools more and more widely in recent years.!However,traditional bond type standing wave type ultrasonic motors have low efficiency and power,so they are hard to be used in feeding systems.This paper proposed a bidirectional standing wave ultrasonic motor by using Langevin type bending transducer to excite bending wave.The vibration theory was used to analyze the operating principle:the bidirectional motion could be realized by exciting two different resonant bending wave if positioning the driving teeth at appropriate location.The finite element method was adopted to determine the structure dimensions and to verify that teeth tips trajectory were diagonal lines with same tilt angle.A prototype was fabricated and its mechanical output was measured,and the following performances were achieved: maximum thrust force 14N,maximum speed 180mm/s.