3-DIMENSIONAL FLOW OF EDDY CURRENTS IN FLUX CONCENTRATION APPARATUS

This paper deals with three dimensional analysis of the eddy current distribution in a cylinder-type flux concentration apparatus by using a four component finite element calculation method. In order to solve z-ward component of eddy currents in a new model with multi-rims, boundary conditions of four components are discussed. We have already examined and analyzed several types of flux concentration apparatus, which utilize the flux concentration effect of eddy currents [1][2][3][4]. However, in these models treated in the references shown above, we do not have to consider the current component perpendicular to the excitation current. In order to obtain three dimensional flow of eddy currents, boundary conditions for four variables should-be selected carefully. Boundary conditions especially for z-ward vector potential and the scalar potential are discussed. © 1990, IEEE. All rights reserved.