A Piezoelectric-Metal-Cavity (PMC) actuator

Kwok Ho Lam, C. L. Sun, H. L W Chan, X. Z. Zhao, C. L. Choy

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)251-253
Number of pages3
JournalJournal of Electroceramics
Issue number3-4
Publication statusPublished - 1 Aug 2007


  • Actuator
  • Piezoelectric
  • Unimorph

ASJC Scopus subject areas

  • Ceramics and Composites

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