MODELLING OF EDDY CURRENT LOSSES BASED ON THE DEVELOPMENT OF MAGNETIC VECTOR POTENTIAL FORMULATIONS

Abstract

Eddy currents always appear in any conduction regions of all types electrical devices, such as electrical apparatus, the cores of transformers, rotating electrical machines, which are subjected to a time-varying magnetic field variation. This leads to an increase of losses and a descrease of efficiency for electrical devices. However, in other fields, it has the effect of detecting break-downs, such as cracks occuring in metal pipes under the seabed or through mountains, or magnetic inductions,  or induction furnaces.  In the recent years, many papers have been  devoted to the finite element method for solving this problem related to eddy currents in conducting regions. In this litterature, a new finite element method  is presented  with the development of magnetic vector potential formulations to compute and simulate local fields, such as the magnetic field, magnetic flux density and eddy current losses of magnetodynamic problems. The developed method is validated via a practical problem.