The ISP technique 3D electromagnetic and eddy current computations in general media

A novel technique for 3-D eddy current computations is presented. It is based on an iterative scalar potential (ISP) method in general media. The resulting equations are solved using finite elements based on a Galerkin procedure. The partial differential equations governing the eddy current problem are solved in a related integral form utilizing Green´s theorem. A major advantage of the method is that the numerical problem is solved in terms of electromagnetic field variables which have a physical meaning. Another major advantage is that there is one degree of freedom per node, which results in a sizable saving in CPU time. Numerical results utilizing this technique were obtained in less than 1/2 of the CPU time consumed utilizing the A-Φ method for the same 3-D grid size