Hybrid FEM/MOM formulation for eddy current problems with moving conductors

In this paper a hybrid formulation for the analysis of electromagnetic fields distribution in systems with conductors in motion is presented. Conductive bodies in relative motion are enclosed in a fictitious surface attached to the conductors. The equivalence theorem is applied to these surfaces and the continuity of tangential components of electric and magnetic fields, taking into account the motional effects, is imposed using the Method Of Moments (M.O.M.). The distribution of electromagnetic fields inside each surface is obtained by means of a Finite Elements Method (F.E.M.) analysis. No re-meshing is required inside and the motional effects are taken into account by means of the boundary conditions. A relevant characteristic of the proposed method is that only a part of the matrices, (namely those involved in the application of MOM), have to be recalculated at each step. The proposed formulation has been tested by comparison with other numerical results.