A linear actuator with an SMA clamping mechanism for dual-slider positioning
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TECHNICAL PAPER
A linear actuator with an SMA clamping mechanism for dual-slider positioning Jianxiang Wang1 • Yuxi Chen2 • Yuxin Peng1,3 Xiaoqing Tian6
•
Yangkun Zhang4 • Mingming Zhang5
•
Received: 19 April 2020 / Accepted: 8 May 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this paper, a linear actuator with a shape memory alloy (SMA) clamping mechanism for dual-slider positioning is proposed by using a single piezoelectric element (PZT). The linear actuator consists of an SMA clamping mechanism, a PZT, a permanent magnet, a steel plate, and a base with a guide way. The SMA clamping mechanism and the steel plate serve as a slider 1 and a slider 2, respectively. When the SMA clamping mechanism releases from the guide way, the slider 1 can be driven as an impact drive mechanism. On the other hand, when the SMA clamping mechanism clamps on the guide way, the slider 2 can be driven as a smooth impact drive mechanism. In the resting state, the SMA clamping mechanism clamps on the guide way to ensure the stability of the whole system. To investigate the performance of the SMA clamping mechanism and the linear actuator, a prototype was constructed with a compact size of 40 mm (L) 9 15 mm (W) 9 12 mm (H). Experimental results confirmed that the dual slides could be driven independently by clamping and releasing the SMA clamping mechanism. It was verified that both the sliders can achieve long motion ranges of several millimeters and high resolution of tens of nanometers.
1 Introduction Microelectronic instruments are widely applied for high precision operations, such as positioning, calibration, and manipulation. These instruments usually consist of two or more objects, which should be positioned independently. A typical application is a miniature zoom lens system with two lenses for zooming and focusing, respectively. Besides, it is also required that the lenses should be & Yuxin Peng [email protected] 1
Department of Sports Science, Zhejiang University, Hangzhou 310058, China
2
College of Literature and Journalism, Hunan University of Technology, Zhuzhou 412000, China
3
NUS Suzhou Research Institute (NUSRI), Suzhou, Industrial Park, Suzhou 215123, China
4
Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518000, China
5
Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen 518055, China
6
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
positioned with long motion ranges and high positioning resolution. A piezoelectric element (PZT) is a type of actuator which is widely used for miniaturization. Despite of small size, fast response, and high resolution of the PZT (Higuchi et al. 1990; Irie et al. 2009; Okamoto and Yoshida 1998; Peng et al. 2015b; Shimizu et al. 2013; Yoshida et al. 2002; Zhang et al. 2019a, b), long motion range positioning is limited by its small stroke. To enlarge the limited stroke of the PZT, one effective way i
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