Dr. Estibalitz Asua Profile

Dr. Estibalitz Asua

at Univ del País Vasco

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Proceedings Article | 3 April 2012 Paper

Design of a new FSMA-based actuator for nanopositioning applications

E. Asua, A. Sadeghzadeh, J. Feuchtwanger, A. García-Arribas, V. Etxebarria

Proceedings Volume 8409, 84090G (2012) https://doi.org/10.1117/12.923218

KEYWORDS: Magnetism, Actuators, Crystals, Capacitors, Shape memory alloys, Smart materials, Position sensors, Relays, Calibration, Ferromagnetics

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Ferromagnetic shape memory alloys (FSMAs) are a special type of smart materials which can commonly display strains of about 6 % by applying an external magnetic field. The large magnetic induced strain and the possibility of non-contact actuation make those materials promising active elements for actuators. The effectiveness of those materials as active elements was experimentally proved in previous works, and it was demonstrated that despite the non-linear and hysteretic response of FSMA materials, they can be successfully controlled, achieving positioning accuracies of the order of a nanometer. In this work, a new actuator based on FSMA is proposed. Two orthogonal applied magnetic fields allow to simultaneously control both the contraction and the expansion of the material. As considerably high magnetic fields are necessary to operate the material, in order to reduce the actuator size, a pulse operation mode is used, which involves higher currents (up to 250 A) during a short time (4-12 ms). A specific high power electronic module is designed for this purpose and magnetic fields up to 0.4 Tesla are achieved. Preliminary positioning experiments are shown.

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