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Open AccessArticle

Hi-Fi Stake Piezo Single Crystal Actuator

Department of Mechanical Engineering, National University of Singapore, 21 Lower Kent Ridge Road, Singapore 119077, Singapore
Microfine Materials Technologies Pte Ltd., 10 Bukit Batok Crescent, The Spire #06-02, Singapore 658079, Singapore
Beijing Crystal Valley Technology Co Ltd., Room B101, Zhongguancum Dongsheng Technology Park, No. 66, Xixiaokou Road, Haidian District, Beijing 100192, China
Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), #08-03, 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore
Authors to whom correspondence should be addressed.
Actuators 2018, 7(3), 60;
Received: 30 July 2018 / Revised: 23 August 2018 / Accepted: 27 August 2018 / Published: 12 September 2018
(This article belongs to the Special Issue Piezoelectric Actuators 2018)
High fidelity (Hi-Fi) piezoelectric single crystal stake actuators are presented in this work. They are made of multiple rectangular d32 mode lead-based relaxor ferroelectric (notably Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZN-PT) and Pb(In0.5Nb0.5)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT)) single crystals bonded along their long edges with the aid of compliant polymeric edge guides into a square or polygonal pipe-like construction. Due to the highly stable engineered domain structure and high piezoelectricity of single crystal active materials, the actuators exhibit large linear displacement responses with negligible (<1%) hysteresis. Prototypes of square-pipe stake actuators were first fabricated and their phase transformation curves under different applied voltages, axial compressive loads and temperatures were established. Based on the information obtained, a range of Hi-Fi stake actuators with external square cross-sections of 5 × 5 mm2, 7.5 × 7.5 mm2 and 10 × 10 mm2, each of 4 different overall lengths of 15, 28, 41 and 54 mm, were further designed and fabricated using either PZN-PT or PIN-PMN-PT single crystals (both with TRO ≈ 110–125 °C) of 0.4 mm in crystal thickness. The stroke for the longest stake actuator fabricated (L = 54 mm) reaches −58 µm at 240 V. The working conditions, over which these Hi-Fi stake actuators remain linear with negligible hysteresis, were established for a total load of up to 10 kg and use temperature of up to 40 °C. View Full-Text
Keywords: piezoelectric single crystal; piezoelectric actuator; low hysteresis; phase transformation piezoelectric single crystal; piezoelectric actuator; low hysteresis; phase transformation
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MDPI and ACS Style

Huang, Y.; Zhang, S.; Wang, P.; Xia, Y.X.; Lin, D.H.; Yao, K.; Lim, L.-C. Hi-Fi Stake Piezo Single Crystal Actuator. Actuators 2018, 7, 60.

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