Abstract
A comparative study on the effect of magnetic shape memory alloy (MSMA) under electromagnet and biased field has been carried out numerically and experimentally. The influencing parameters, magneto-strain, power efficiency and time response have been considered. The intensity and uniformity of the magnetic field are predicted numerically incorporated in the experimentation. The pre-stressed specimen is subjected to electromagnet field and bias field actuations. The measured data demonstrate an improvement in the performance of initial magneto-strain with an average difference of 75% and 27.2% reduction in time response of the MSMA actuator at lower input power.
Highlights
Active materials with large strain and high actuating frequencies are of wide interest in modern micro-actuator and micro-sensor dominated automation (Kensuke et al, 2013)
It was observed that the density of magnetic field has been increased by a magnitude of 110kA/m for biased magnet
It was observed that a sudden jump in displacement after 2A current, which corresponds to de-pinning effect
Summary
Active materials with large strain and high actuating frequencies are of wide interest in modern micro-actuator and micro-sensor dominated automation (Kensuke et al, 2013). Among many MSMAs, e.g., FePd, NiMnAl, NiMnSn, NiMnIn, Fe3Pt, CoNiAl, CoNiGa [1, 12], NiMnGa alloys are widely used in sensors and actuators due to large magneto-strain [8]. They have a moderate density (2 to 3MPa) with high magnetic anisotropy energy[2] and require large fields ranging from 0.8 to 1T, for its full-scale magneto-strain [5, 9, 13, 7]. Up to 6% magnetic field induced strain and 1kHz of frequency are achieved in five layers modulated, single crystal tetragonal NiMnGa alloy [1, 6]
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