Minimising heat dissipation in ultrasonic piezomotors by working in a resonant mode

Heat dissipation in ultrasonic motors should be limited, especially in precision applications since it causes thermal deformations. Therefore, an easy-to-understand mechanical model was developed to simulate heat dissipation in an ultrasonic motor. This model involves the dielectric, piezoelectric a...

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Bibliographic Details
Published in:Precision engineering 2008-04, Vol.32 (2), p.114-125
Main Authors: Devos, Steven, Reynaerts, Dominiek, Van Brussel, Hendrik
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Mechanical engineering. Machine design
Piezoelectric elements
Precision engineering, watch making
Precision positioning
Ultrasonic motors
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Description
Summary:Heat dissipation in ultrasonic motors should be limited, especially in precision applications since it causes thermal deformations. Therefore, an easy-to-understand mechanical model was developed to simulate heat dissipation in an ultrasonic motor. This model involves the dielectric, piezoelectric and mechanical hysteretic losses of the piezoelectric material. Both the model and the experiments lead to the same recommendations to minimise the heat dissipation for ultrasonic motors. Large piezoactuators, exciting passive structures at high resonance frequencies result in a minimum heat dissipation. Furthermore, it was shown that the optimal frequency regarding minimal heat dissipation lies between the resonance and the antiresonance frequency of the system, close to the resonance frequency.
ISSN:0141-6359
1873-2372
DOI:10.1016/j.precisioneng.2007.06.003