Design of an impact drive actuator using a shape memory alloy wire

作者：Hattori Shinya; Hara Masayuki^*; Nabae Hiroyuki; Hwang Donghyun; Higuchi Toshiro

来源：Sensors and Actuators A: Physical , 2014, 219: 47-57.

DOI：10.1016/j.sna.2014.08.013

• Shape memory alloy
• Impact drive mechanism
• Linear actuator

This paper introduces an impact drive mechanism (IDM) that utilizes the rapid contraction property of shape memory alloy (SMA) wire. In this study, possible structures for an SMA-wire-based IDM actuator are investigated, and a prototype actuator comprising a main body, an inertia body, an SMA wire, and a bias spring is developed. To verify the applicability of the prototype actuator as a positioning device, driving experiments were conducted under various conditions. The experimental results demonstrated that the prototype actuator enables bidirectional step-like movement with several step sizes by changing the profile of applied voltage, such as amplitude, duty cycle, and frequency. In addition, we developed PI-controller-based position control systems by using these three parameters as control input; the control characteristics and potential applications of each method were discussed. These results implied that the SMA-wire-based IDM actuator has the potential to be used as a new linear actuator in sub-millimeter order driving.

• 出版日期2014-11-1