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Phase resistance with displacement feedback control for thick SMA Actuators

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Abstract

The purpose of this study is to design and control a thick shape memory alloy (SMA) actuator to achieve rapid position control with two connected SMA wires. In the past, research has focused on position and force control of thin SMA wires, because they cool rapidly in air and as it is easy to get rapid response for SMA actuators in this manner. However, the cooling time is longer with thick SMA wires, making it difficult to obtain rapid position responses with traditional displacement feedback control methods. Phase resistance and displacement feedback control (PRDFC), combing phase resistance and displacement as feedback, minimizes cooling time by shortening the latency duration of thick SMA wires, and experimental results here show that more rapid responses are achieved using the method proposed here than when only displacement is used as feedback.

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Authors and Affiliations

  1. School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, Hubei, 430076, China

    Junfeng Li

  2. Division of Human Mechanical Systems and Design, Graduate School of Engineering, Hokkaido University, North8, West 5, Sapporo, Japan, 060-0808

    Hiroyuki Harada

Authors
  1. Junfeng Li
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  2. Hiroyuki Harada
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Correspondence to Junfeng Li.

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Li, J., Harada, H. Phase resistance with displacement feedback control for thick SMA Actuators. Int. J. Precis. Eng. Manuf. 16, 81–90 (2015). https://doi.org/10.1007/s12541-015-0010-8

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  • DOI: https://doi.org/10.1007/s12541-015-0010-8

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