3-D finite element analysis of flux reflection and flux concentration effects of eddy currents

This paper deals with the flux reflection effect and the flux concentration effect of eddy currents induced in a pair of conductors with small slit between them under an a.c.-excited coil. To perform this analysis an iterative method of FEM calculation using four components is applied to the 3-D model. By this method, the computer memory for the main system matrix can be reduced to one sixteenth, compared with the 3-D methods conventionally used. The model analyzed is a flux concentration apparatus for producing a state of high flux density through utilization of eddy currents.