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中文摘要：
设计了一种利用变截面杆纵振模态工作的直线超声电机，该超声电机的特点是有两个变截面杆状并由一半圆环连接。位于圆环中间驱动足顶部质点以椭圆轨迹运动，当驱动足以一定预压力接触动子时，动子将输出直线运动。通过建立定子的有限元模型并对其进行谐响应分析验证了原理的可行性。提出了电机结构设计的要求，并通过有限元方法进行了结构参数灵敏度分析，为该类电机结构的设计提供了高效的方法。样机试验表明，该电机在100mm／s的运行速度下可以推动10N的负载。
英文摘要：
A linear ultrasonic motor using longitudinal vibration of bar with varying section is proposed. The lin- ear ultrasonic motor has two varying section bars connected by semi-circumferential structure. Elliptical trajecto- ries of particles are formed on top of the semi-circumferential structure outer surface where a driving foot is locat- ed. And a mover is pushed to move linearly when the driving foot is pressed onto it. Finite element model of sta- tor is built and results of harmonic analysis verify its principle. Moreover, design requirements of the motor are analyzed through finite element analysis and the results of sensitive analysis provide an efficient way to design the type of linear ultrasonic motor. Prototype test shows that the motor can afford load of 10 N at the speed of 100 mm/s.
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