Abstract
Power losses in a magnetostrictive actuator have been studied. The system consists of a cylindrical rod of Terfenol-D, a surrounding magnetic circuit to get a homogeneous flux, a mechanical load applied to the rod ends, and an electric coil. We consider transient operating conditions with time-varying driving voltage. Nonlinearity and hysteresis are handled by using a magnetomechanical hysteresis model as the constitutive law. Eddy currents and field constriction are taken into account by a finite difference representation of the diffusion equation for the active rod. Coil losses are trivially found through Ohm’s law. The influence of laminations in the magnetostrictive rod on the eddy current loss is examined using finite element methods.
Published Version
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