Metodi numerici per lo studio dei campi magnetici transitori nelle macchine elettriche

The transient current following the application of a constant emf to a bar within a slot is obtained by resorting to an approach through the magnetic potential. The finite element method (FEM) is examined in both its variational and nodal formulations. It is shown that both formulations lead to the same resolving equations through an appropriate choice of the integration outline in application of the circulation theorem. Solutions of other authors, with reference to transient conditions, are developed in a unified manner. A simplified FEM nodal formulation is proposed. Its validity is proved by comparison with previous formulations