Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23652
Title: A Piezoelectric-Metal-Cavity (PMC) actuator
Authors: Lam, KH
Sun, CL
Chan, HLW 
Zhao, XZ
Choy, CL 
Keywords: Actuator
Piezoelectric
Unimorph
Issue Date: 2007
Publisher: Springer
Source: Journal of electroceramics, 2007, v. 18, no. 3-4, p. 251-253 How to cite?
Journal: Journal of electroceramics 
Abstract: A novel piezoelectric-metal-cavity (PMC) actuator has been designed to exhibit a large flexural displacement. This PMC actuator consists of a metal ring sandwiched between two identical piezoelectric unimorphs. The radial contraction of the piezoelectric ceramic is converted into flextensional motion of the unimorph, causing a large flexural displacement in the centre part of the actuator. The metal cavity acts a function of circumferential coupling of the piezoelectric unimorphs. It was found that the effective piezoelectric charge coefficient of the PMC actuator can approach 40,000 pC/N. With its high piezoelectric and electromechanical coupling coefficients, the PMC actuator gives a static displacement 16 μm can be produced under a d.c. driving voltage of ±77 V.
URI: http://hdl.handle.net/10397/23652
ISSN: 1385-3449
EISSN: 1573-8663
DOI: 10.1007/s10832-007-9067-9
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