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Author: search.filters.author.Joshi, R.Subject: search.filters.subject.Magnetostrictive actuator

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    Design and study of magnetization characteristics of a magnetostrictive (Tb0.3Dy0.7Fe1.95) actuator under zero pre-stress conditions for direct current input
    (2013) Joshi, R.; Kadoli, R.
    This paper presents the design of actuator using magnetostrictive material under zero prestress conditions for direct current input, which is being developed to move friction pads of a disc brake for braking action. Comparison of analytical, experiment and Maxwell simulation of coils in free air is being carried out to predict the magnetic field generated by them and magneto motive force reaching the measuring end of magnetostrictive material. Experiments are being conducted to verify the performance of magnetostrictive actuator for dc input under zero-preload conditions. A set of magnetization curves are being predicted using Jiles-Atherton model in the context of control applications that require an accurate characterization of the relation between input applied magnetic field and strain output by the actuator. Further the validation of Jiles-Atherton model results is being done with the results obtained from experiments. © (2013) Trans Tech Publications, Switzerland.
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    Finite element magnetostatic analysis of magnetostrictive (Tb 0.3Dy0.7Fe1.95) actuator with different housing materials
    (Defense Scientific Information and Documentation Centre, 2013) Joshi, R.; Subba Rao, M.; Kadoli, R.
    Permeability of a housing material is one of the significant factors affecting the performance of Tb0.3Dy0.7Fe1.95 based magnetostrictive actuator. According to Lenz's law the rate of flux transfer depends on permeability of housing material surrounding the terfenol-D. In this paper the co-axial coils in a free air are analysed under direct current excitation and the results are found to agree well with both analytical and Maxwell simulation. Also, the comparison of flux density distribution in co-axial coils placed inside different housing materials of magnetostrictive actuator is found by solving magnetostatic equations using Ansoft Maxwell 2D solver. The axial distribution of magnetic flux density, radial distribution of magnetic flux density and flux distribution in the actuator assembly with different housing materials namely mild steel, cast iron and aluminium with and without Terfenol-D are discussed. © 2013, DESIDOC.