17 April 2017 A torsional artificial muscle from twisted nitinol microwire
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Abstract
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.
Conference Presentation
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Seyed M. Mirvakili, Ian W. Hunter, "A torsional artificial muscle from twisted nitinol microwire", Proc. SPIE 10163, Electroactive Polymer Actuators and Devices (EAPAD) 2017, 101630S (17 April 2017); doi: 10.1117/12.2261712; https://doi.org/10.1117/12.2261712
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