A Practical Implementation for Field-Based Computation of Core Loss in Permanent Magnet Synchronous Machines

A practical methodology is presented for computing core loss in permanent magnet synchronous machines (PMSMs) using magnetic field data from finite element analysis (FEA). By exploiting geometric symmetry and field periodicity, the number of required FEA simulations is reduced, enabling reconstruction of the flux-density field for a complete electrical cycle from limited data. The Fourier analysis and the spectral derivative of the field then provide a systematic evaluation of eddy current loss and excess loss. Hysteresis loss is calculated using the wipe-out rule to identify major and minor loops, whose areas are then approximated by those of equivalent elliptical loops. Numerical results are presented for core loss computations in a PMSM.