旋转型行波超声电机

旋转型行波超声电机(中文3500字,英文2000字)
帕萨迪纳，CA91109，加利福尼亚理工学院喷气推进实验室；
科斯塔梅萨，CA92627，材料质量检测中心，威廉梅兰迪亚。

摘要：旋转型超声波电机逐渐发展为太空飞船的微型驱动器及其子系统。此技术应用于有着严格要求的商业产品中，为了更加有效地设计此类电机而采用分析工具。分析模型用于检测在旋转超声电机中激励产生的弯曲行波。这个有限元分析模型为环形，被用于预测环形定子的振动频率和模态响应。此模型给设计高效率的超声波电机提供依据，定子的设计包括齿槽、压电体、定子的几何外形等方面，定子是由他们有机地组合而成。理论计算值与实验结果的比较表明这将是一个值得世人所关注的课题。与此同时，超声波电机还被用于机械臂，他们是否能够在火星的环境下正常运行的研究还在进行中。

关键词：驱动器，弹性体，压电电机，超声波电机，定子与转子，模态分析。

Rotary Ultrasonic Motors Actuated By Traveling Flexural Waves
Shyh-Shiuh Lih, Yoseph Bar-Cohen,Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109yosi@jpl.nasa.gov  and Willem Grandia, Quality Material Inspection (QMI), Costa Mesa, CA 92627
1.ABSTRACT
  Ultrasonic rotary motors are being developed as actuators for miniature spacecraft instruments and subsystems. The technology that has emerged in commercial products requires rigorous analytical tools for effective design of such motors. An analytical model was developed to examine the excitation of flexural plate wave traveling in a rotary piezoelectrically actuated motor. The model uses annular finite elements that are applied to predict the excitation frequency and modal response of the annular stator. This model allows to design efficient ultrasonic motors (USMs) and it incorporates the details of the stator which include the teeth, piezoelectric crystals, stator geometry, etc. The theoretical predictions and the experimental corroboration showed a remarkable agreement. Parallel to this effort, USMs are made and incorporated into a robotic arm and their capability to operate at the environment of Mars is being studied.