A torsional artificial muscle from twisted nitinol microwire
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Nitinol microwires of 25 μm in diameter can have tensile actuation of up to 4.5% in less than 100 ms. A work density of up to 480 MPa can be achieved from these microwires. In the present work, we are showing that by twisting the microwires in form of closed-loop two-ply yarn we can create a torsional actuator. We achieved a revisable torsional stroke of 46°/mm with peak rotational speed of up to 10,000 rpm. We measured a gravimetric torque of up to 28.5 N•m/kg which is higher than the 3-6 N•m/kg for direct-drive commercial electric motors. These remarkable performance results are comparable to those of guest-infiltrated carbon nanotube twisted yarns.
Date issued
2017-04Department
Massachusetts Institute of Technology. Department of Biological Engineering; Massachusetts Institute of Technology. Department of Mechanical Engineering; Koch Institute for Integrative Cancer Research at MITJournal
Proceedings of SPIE--the Society of Photo-Optical Instrumentation Engineers
Publisher
SPIE-Intl Soc Optical Eng
Citation
Mirvakili, Seyed M., and Ian W. Hunter. “A Torsional Artificial Muscle from Twisted Nitinol Microwire.” Edited by Yoseph Bar-Cohen. Electroactive Polymer Actuators and Devices (EAPAD) 2017 (April 17, 2017).
Version: Original manuscript
ISSN
0277-786X