Hybrid FE-Analytical Procedure for Fast Flux Map Computation of Permanent Magnets Assisted Synchronous Reluctance Machines

This paper proposes an accurate hybrid FE-analytical model for synchronous reluctance machines with and without permanent magnets capable of taking into account all the machine non-linearities. The hybrid approach consists in solving the d- and q-axis magnetic equivalent circuits in a non linear fashion so to consider the saturation effects. The cross-coupling effects are taken into account by adjusting the analytical flux maps with the results obtained FE-simulating few operating points in the full d-q current plane. The proposed approach allows to obtain an excellent estimation of the direct and quadrature axis fluxes for a wide range of operating conditions including the overload ones with a negligible computational effort when compared to a full finite element approach.