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Actuators 2018, 7(3), 61; https://doi.org/10.3390/act7030061

High-Bending-Stiffness Connector (HBSC) and High-Authority Piezoelectric Actuator (HAPA) Made of Such

1
Department of Mechanical Engineering, National University of Singapore, 21 Lower Kent Ridge Road, Singapore 119077, Singapore
2
Microfine Materials Technologies Pte Ltd., 10 Bukit Batok Crescent, The Spire #06-02, Singapore 658079, Singapore
3
Beijing Crystal Valley Technology Co., Ltd., Room B101, Zhongguancum Dongsheng Technology Park, No. 66, Xixiaokou Road, Haidian District, Beijing 100192, China
*
Authors to whom correspondence should be addressed.
Received: 30 July 2018 / Revised: 10 September 2018 / Accepted: 10 September 2018 / Published: 12 September 2018
(This article belongs to the Special Issue Piezoelectric Actuators 2018)
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Abstract

High-authority piezoelectric actuator (HAPA) is a term used to describe high-performance piezoelectric actuators of relatively large displacement (≥50 μm) and high blocking force (≥100 N), but compact in size. One such piezoelectric actuator is described in this paper, which is made possible by means of high-bending-stiffness connector (HBSC) that connects multiple commercial piezoceramic stacks into a stable 2- (or multi-) level actuation configuration. Key design requirements for the HBSC are described. Computer simulation results and experimental verification are presented. A HAPA-(2 + 2) actuator was fabricated from such a HBSC, in which there are two commercial PZT stacks projecting upwards in the upper level and two projecting downwards in the lower lever, all of 5 × 5 mm2 in cross-section and 40 mm in length. The HAPA-(2 + 2) actuator prototype displays about twice the overall stroke and blocking force of individual stacks, being about 90 μm and >1600 N, respectively. This compares favorably with lever-arm, flextensional, and telescopic actuators, of which the blocking force is adversely affected. Using a similar concept, HBSCs and HAPAs of other designs are presented. In addition to being stand-alone actuators, the HAPAs can be used as the active material to drive existing displacement amplification schemes to produce piezoelectric actuators of exceptional performance characteristics. View Full-Text
Keywords: high-bending-stiffness connector (HBSC); high-authority piezoelectric actuator (HAPA); 2-level actuation; large stroke; high blocking force high-bending-stiffness connector (HBSC); high-authority piezoelectric actuator (HAPA); 2-level actuation; large stroke; high blocking force
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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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Huang, Y.; Xia, Y.X.; Lin, D.H.; Lim, L.-C. High-Bending-Stiffness Connector (HBSC) and High-Authority Piezoelectric Actuator (HAPA) Made of Such. Actuators 2018, 7, 61.

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