Abstract
In this paper, a new bulk magnetostrictive bending actuator is presented using a permendur rod. By applying an axial magnetic field in a thin layer of the magnetostrictive rod, the tensile deformation of the layer would cause bending of the actuator. The generation of the magnetic field in the layer is carried out by coils and a comb-shaped magnetic core. The Comsol software is used to calculate the magnetic field. Following the fabrication of the actuator, deflection values are measured at different currents and compared with results of the simulation. The actuator has been tested with constant and alternating magnetic fields. The actuator is excited with an alternating magnetic field at the resonance frequency of the actuator to increase bending deflections. Based on the experimental results, the maximum displacement of the actuator is 1.6 µm under the DC excitation with a 3.8 A current and is 120 µm under the AC excitation at the frequency of 130 Hz and the RMS current of 3.8 A.
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