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Proceedings Paper

Rotary ultrasonic motors actuated by traveling flexural waves
Author(s): Yoseph Bar-Cohen; Xiaoqi Bao; Willem Grandia
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Paper Abstract

Efficient miniature actuators that are compact and consume low power are needed to drive telerobotic devices and space mechanisms in future NASA missions. Ultrasonic rotary motors have the potential to meet this NASA need and they are developed as actuators for miniature telerobotic applications. The technology that has emerged in commercial products requires rigorous analytical tools for effective design of such motors. A finite element 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 an annular stator. This model is being developed to enable the design of efficient ultrasonic motors (USMs) and it incorporates the details of the stator which include the teeth, piezoelectric crystals, stator geometry, etc. The theoretical predictions were corroborated experimentally for the stator. Parallel to this effect, USMs are made and incorporated into a robotic arm and their capability to operate at the environment of Mars is being studied. Motors with two different actuators layout were tested at cryovac conditions and were shown to operate down to -150 degree(s)C and 16-mTorr when the activation starts at ambient conditions.

Paper Details

Date Published: 27 July 1998
PDF: 7 pages
Proc. SPIE 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems, (27 July 1998); doi: 10.1117/12.316950
Show Author Affiliations
Yoseph Bar-Cohen, Jet Propulsion Lab. (United States)
Xiaoqi Bao, Jet Propulsion Lab. (United States)
Willem Grandia, Quality Material Inspection (United States)

Published in SPIE Proceedings Vol. 3329:
Smart Structures and Materials 1998: Smart Structures and Integrated Systems
Mark E. Regelbrugge, Editor(s)

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