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Proceedings Paper

A comparative study of ultrasonic micro-motors based on single crystal PMN-PT and polycrystalline PZT ceramics
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Paper Abstract

A comparative study has been made to explore the potential benefits of newly available single-crystal ferroelectric materials when used in a practical device, in this case an ultrasonic micro-motor. This type of micro-motor exhibits exceptional power-to-weight characteristics, which could be exploited beneficially, for example, in unmanned air-vehicle (UAV) systems. The operating principles of a range of commercial and experimental motor designs were evaluated objectively in order to identify areas of performance that can potentially be enhanced using PMN-PT single-crystal piezoelectric ceramics. Based on this analysis a practical motor design was selected for construction and experimentation. Detailed numerical analysis indicated that a motor constructed from single crystal PMN-PT could be expected to provide an improvement in motor stall-torque by up to a factor of 2.8 and a no-load speed improvement by a factor of 1.5 when compared with motors based on standard polycrystalline lead-zirconate-titanate (PZT) ceramics. In practice single-crystal versions of the motor were found to produce double the power output of their polycrystalline counterparts. Overall efficiency was found to be improved two-fold. There were significant discrepancies between the numerical predictions for the single-crystal devices and their measured performance, whereas the polycrystalline devices were found to perform closely in line with predictions.

Paper Details

Date Published: 19 March 2008
PDF: 6 pages
Proc. SPIE 6930, Industrial and Commercial Applications of Smart Structures Technologies 2008, 693013 (19 March 2008); doi: 10.1117/12.776321
Show Author Affiliations
Stephen A. Wilson, Cranfield Univ. (United Kingdom)
Philip J. Rayner, Cranfield Univ. (United Kingdom)
Jonathan Gore, QinetiQ Ltd. (United Kingdom)
Adrian R. Bowles, QinetiQ Ltd. (United Kingdom)
Richard C. McBride, QinetiQ Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 6930:
Industrial and Commercial Applications of Smart Structures Technologies 2008
L. Porter Davis; Benjamin Kyle Henderson; M. Brett McMickell, Editor(s)

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