Computation of 2D and 3D Eddy Currents of Eddy Current Retarders

This paper deals with the A-Φ-A formulation applied to problems where motion is the source of eddy currents. The Lorenz gauge is used to ensure uniqueness of the solution and leads to a two-step computation procedure: A is computed first followed by Φ on moving regions only. Furthermore, a stable and accurate solution of A is obtained through implementation of a Petrov-Galerkin method. Numerical results of 2D and 3D problems are given by using finite element methods. Flux lines of 2D model and vector flux density of 3D model are given. The resulting braking torques are compared to measurements in 2D model, the results are satisfactory.