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A Piezoelectric-Metal-Cavity (PMC) actuator

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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.

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Acknowledgements

This work was supported by the Centre for Smart Materials of the Hong Kong Polytechnic University.

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Authors and Affiliations

  1. Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China

    K. H. Lam, C. L. Sun, H. L. W. Chan & C. L. Choy

  2. Department of Physics, Wuhan University, Wuhan, 430072, China

    C. L. Sun & X. Z. Zhao

Authors
  1. K. H. Lam
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  2. C. L. Sun
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  3. H. L. W. Chan
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  4. X. Z. Zhao
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  5. C. L. Choy
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Correspondence to K. H. Lam.

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Lam, K.H., Sun, C.L., Chan, H.L.W. et al. A Piezoelectric-Metal-Cavity (PMC) actuator. J Electroceram 18, 251–253 (2007). https://doi.org/10.1007/s10832-007-9067-9

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  • DOI: https://doi.org/10.1007/s10832-007-9067-9

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