A torsional artificial muscle from twisted nitinol microwire

Seyed M. Mirvakili; Ian W. Hunter

doi:10.1117/12.2261712

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

Citation Download Citation

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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