Four components three dimensional FEM analysis of flux concentration apparatus with four plate

This paper deals with the four component three dimensional FEM analysis of a flux concentration model with four thick conducting plates placed between a pair of a.c.-excited coils. We have already analyzed a flux concentration apparatus with two conducting plates by using a newly developed iterative 3-D calculation method.[1] [2] An improved formulation is also treated in this paper. This calculation method is applied to the present four-plate type model, to prove its adaptability and to search for more efficient design of such apparatus. Distributions of flux densities, eddy currents and scalar potentials are calculated and discussed. The role of the scalar potential for the 3-D eddy current diffusion problems is also interpreted, based on our calculation results

Three 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

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

Three dimensional analysis of a cylinder-type flux concentration apparatus

This paper deals with three dimensional A-¢ analysis of a newly developed cylinder-type flux concentration apparatus. We have already examined and analyzed several types of such apparatus, which utilize the flux concentration effect of eddy currents. [1][2][3] The new model treated here, attains compactness in size and high efficiency in flux concentration by assembling a conducting plate just inside one or several excitation windings. A new four-component direct finite element calculation method is applied to the present analysis, and three dimensional distributions of the flux density; the eddy current and the scalar potential are obtained successfully. The divided direct calculation method is discussed in comparison with our former iterative method