On mesh sensitive calculations in 3D finite element modeling of electric machines

Abstract

The study has been carried on for mesh sensitivity in 3D finite element (FEM) calculation of magnetic losses in laminations of an electric machine. Looking for stabilization of results with growing refinement of meshing, we analyse the sensitivity-free ranges of mesh density for several uncorrelated pattern sets of the machine under study. The mesh sensitivity is lesser for lower frequency. Together with algorithmical limitation of the FEM calculation of magnetic losses, actually leading only to classical losses, the mesh sensitivity contests this calculation method even at high frequency. As for the FEM field density calculation, it can be locally relevant provided that a time and power consuming research determines the sensitivity-free mesh density.