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Actuators 2017, 6(2), 19; doi:10.3390/act6020019

Design and Characterization of In-Plane Piezoelectric Microactuators

1
Microsystems, Actuators and Sensors Group, Universidad de Castilla-La Mancha, 13071, Ciudad Real, Spain
2
Departamento de Matemáticas, ETSII, Universidad de Castilla-La Mancha, 13071, Ciudad Real, Spain
3
Institute of Sensor and Actuator Systems, Vienna University of Technology, 1040, Vienna, Austria
*
Author to whom correspondence should be addressed.
Academic Editor: Delbert Tesar
Received: 28 February 2017 / Revised: 30 May 2017 / Accepted: 1 June 2017 / Published: 3 June 2017
(This article belongs to the Special Issue MEMS-based Actuators)
View Full-Text   |   Download PDF [3767 KB, uploaded 6 June 2017]   |  

Abstract

In this paper, two different piezoelectric microactuator designs are studied. The corresponding devices were designed for optimal in-plane displacements and different high flexibilities, proven by electrical and optical characterization. Both actuators presented two dominant vibrational modes in the frequency range below 1 MHz: an out-of-plane bending and an in-plane extensional mode. Nevertheless, the latter mode is the only one that allows the use of the device as a modal in-plane actuator. Finite Element Method (FEM) simulations confirmed that the displacement per applied voltage was superior for the low-stiffness actuator, which was also verified through optical measurements in a quasi-static analysis, obtaining a displacement per volt of 0.22 and 0.13 nm/V for the low-stiffness and high-stiffness actuator, respectively. In addition, electrical measurements were performed using an impedance analyzer which, in combination with the optical characterization in resonance, allowed the determination of the electromechanical and stiffness coefficients. The low-stiffness actuator exhibited a stiffness coefficient of 5 × 104 N/m, thus being more suitable as a modal actuator than the high-stiffness actuator with a stiffness of 2.5 × 105 N/m. View Full-Text
Keywords: piezoelectric; AlN; microactuators; in-plane; electromechanical coefficient; stiffness coefficient piezoelectric; AlN; microactuators; in-plane; electromechanical coefficient; stiffness coefficient
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Toledo, J.; Ruiz-Díez, V.; Diaz-Molina, A.; Ruiz, D.; Donoso, A.; Bellido, J.C.; Wistrela, E.; Kucera, M.; Schmid, U.; Hernando-García, J.; Sánchez-Rojas, J.L. Design and Characterization of In-Plane Piezoelectric Microactuators. Actuators 2017, 6, 19.

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