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A simple dynamic model for eddy currents in a magnetic actuator

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1 Author(s)
Feeley, Joseph J ; Dept. of Electr. Eng., Idaho Univ., Moscow, ID, USA

This paper presents a simple dynamic model of eddy currents in a magnetic actuator. The model is based on the application of Maxwell's equations to a homogeneous ferromagnetic conductive material. The resulting diffusion equation is solved in two dimensions for a cross-sectional cut through a rectangular bar; boundary conditions are imposed by a sinusoidally varying actuator coil current. The utility of the new modeling approach is illustrated by predicting the dynamic performance of a magnetic bearing actuator. The predictions are found to be in good agreement with measured values. The model provides a new and convenient method of modeling the relationships among voltage, current, force, and flux in magnetic circuits containing eddy currents

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Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 2 )