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

by Yu Huang 1,2,*, Yue Xue Xia 2, Dian Hua Lin 2 and Leong-Chew Lim 2,3,*
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.
Actuators 2018, 7(3), 61; https://doi.org/10.3390/act7030061
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)
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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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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