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The design and characterization of a novel piezoelectric transducer-based linear motor

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8 Author(s)
Palmer, J.A. ; North Carolina State Univ., Raleigh, NC, USA ; Dessent, B. ; Mulling, J.F. ; Usher, Tim
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Before microminiature robots can be realized, new direct drive micromotor systems must be developed. In this research, a linear motor system for a miniature jumping robot was desired. However, current systems must display better force/torque characteristics than is currently available. This paper deals with the design, construction, and testing, of a macro-scale, unidirectional, direct drive linear piezomotor that operates like an inchworm. It uses a parallel arrangement of unimorph piezoelectric transducers, in conjunction with passive mechanical latches, to perform work on a coil spring. Experimental results showed that the linear piezomotor achieved a maximum no-load velocity of 161 mm/s, and a blocked force of 14 N, at a drive signal frequency of 100 Hz. Thereafter, back slip in the latch assembly restricted the forward motion. Based on the results obtained with the macro-level linear piezomotor, it is concluded that smaller direct drive piezomotor designs based on unimorph piezoelectric transducers are achievable. System scalability will be addressed in a future publication.

Published in:

Mechatronics, IEEE/ASME Transactions on  (Volume:9 ,  Issue: 2 )

Date of Publication:

June 2004

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