A Distributed Current Source Model for Analyzing Motion-Induced Eddy-Current in a Conductor With Arbitrary Movements

Abstract

This article presents a distributed current source (DCS) model for predicting the eddy current (EC) induced in a conductor in a magnetic field due to mechanical motion and the EC-generated magnetic flux density (MFD) for measurements. Formulated in state-space and iteratively solved in time domain, the general motion-induced EC model accounts for the effects of the weak magnetization of the material, the Lorentz force per unit charge, and the relative location between the conductor and external source that generates the magnetic field, and that between the EC field and MFD sensor. Verified numerically by comparing the predicted motion-induced EC with that of a finite element method, parametric effects on motion-induced EC are analyzed. Experiments were conducted on a commercial CNC lathe simulating three practical applications. In all cases the relative differences between the predicted and measured MFD are in the range from 5 to 15%, validating the accuracy of the DCS modeled solutions