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Proceedings Paper

Miniaturization of planar horn motors
Author(s): Stewart Sherrit; Patrick N. Ostlund; Zensheu Chang; Xiaoqi Bao; Yoseph Bar-Cohen; Scott E. Widholm; Mircea Badescu
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Paper Abstract

There is a great need for compact, efficient motors for driving various mechanisms including robots or mobility platforms. A study is currently underway to develop a new type of piezoelectric actuators with significantly more strength, low mass, small footprint, and efficiency. The actuators/motors utilize piezoelectric actuated horns which have a very high power density and high electromechanical conversion efficiency. The horns are fabricated using our recently developed novel pre-stress flexures that make them thermally stable and increases their coupling efficiency. The monolithic design and integrated flexures that pre-stresses the piezoelectric stack eliminates the use of a stress bolt. This design allows embedding solid-state motors and actuators in any structure so that the only macroscopically moving parts are the rotor or the linear translator. The developed actuator uses a stack/horn actuation and has a Barth motor configuration, which potentially generates very large torque and speeds that do not require gearing. Finite element modeling and design tools were investigated to determine the requirements and operation parameters and the results were used to design and fabricate a motor. This new design offers a highly promising actuation mechanism that can potentially be miniaturized and integrated into systems and structures. It can be configured in many shapes to operate as multi-degrees of freedom and multi-dimensional motors/actuators including unidirectional, bidirectional, 2D and 3D. In this manuscript, we are reporting the experimental measurements from a bench top design and the results from the efforts to miniaturize the design using 2×2×2 mm piezoelectric stacks integrated into thin plates that are of the order of 3 × 3 × 0.2 cm.

Paper Details

Date Published: 3 April 2012
PDF: 9 pages
Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 83452C (3 April 2012); doi: 10.1117/12.915387
Show Author Affiliations
Stewart Sherrit, Jet Propulsion Lab. (United States)
Patrick N. Ostlund, Jet Propulsion Lab. (United States)
Zensheu Chang, Jet Propulsion Lab. (United States)
Xiaoqi Bao, Jet Propulsion Lab. (United States)
Yoseph Bar-Cohen, Jet Propulsion Lab. (United States)
Scott E. Widholm, Jet Propulsion Lab. (United States)
Mircea Badescu, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 8345:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
Masayoshi Tomizuka; Chung-Bang Yun; Jerome P. Lynch, Editor(s)

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