Design of an Impact Drive Actuator Using a Shape Memory Alloy Wire
- Design of an Impact Drive Actuator Using a Shape Memory Alloy Wire
- Hattori, Shinya; Hara, Masayuki; Nabae, Hiroyuki; 황동현; Higuchi, Toshiro
- Shape memory alloy; Impact drive mechanism; Linear actuator
- Issue Date
- Sensors and actuators. A, Physical
- VOL 219, 47-57
- 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.
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