3-D distribution of flux density and an inference about scalar potential in a flux concentration model

This paper deals with the three dimensional analysis of a flux concentration model with two conducting plates placed in parallel between a pair of a.c.-excited coils. We have already presented an analysis for the model with a coarse mesh and volumeless plane coils, as well as newly developed iterative 3-D calculation method. [1] The model analyzed this time has total nodes and elements of about twice as those of the model previously calculated. The flux density distribution is compared with experimental data. Distributions of eddy currents and scalar potentials are also solved. Flux concentration effect in the air-slit and flux reflection effect over a conducting plate are seen more clearly. An inference about the role of scalar potential is obtained from our calculation results.