Analytical modeling of eddy current losses in Axial Flux PMSM using resistance network

This paper presents an analytical modeling of eddy current losses of an Axial Flux Permanent Magnet Synchronous Machine (AFPMSM) using coupled solution of Maxwell´s equations and resistance network. The idea is based on calculating the flux density in an accurate way in the air gap area and on the magnet surface taking into account the effect of armature field and slotting effect. The resistance network for the magnet is then reconstructed by dividing it into a number of nodes and branches. The sources in the resistance network are based on the time derivative of the flux density on the permanent magnet (PM) surface. The field solution is analyzed in the frequency domain and the magnetic resistance network is solved for each frequency. Compared to the Finite Element Method (FEM), the analytical model has the advantage of flexibility in geometrical machine parameters, less CPU time, and accurate results.