Magneto-mechanical Coupled Magnetostriction Model for Terfenol-D Actuator under Step Input

This paper discusses the design and magnetic circuit optimization of a Terfenol-D actuator. Optimization of the coaxial coils is being carried out for axial magnetic field based on shape factor. Experimental set up for measuring magnetic flux density and displacement of a Terfenol-D actuator are outlined. Numerical magnetic flux density of coaxial coils in free air are analyzed using Maxwell 2D solver. Experiments are conducted on a Terfenol-D actuator to measure the output displacement for different preloads under step input conditions. Magnetic field strength considering inductance of driving coils, magnetization using Jiles-Atherton model and magnetostriction using magneto-mechanical coupled magnetostriction model are evaluated to study the response characteristics of a Terfenol-D actuator. The results obtained from magneto-mechanical coupled magnetostriction model are verified with the experimental data.