Multi-slice FE modeling of electrical machines with skewed slots-the skew discretization error

The simulation of rotating electrical machines with skewed slots by means of a multi-slice FE model is studied. Particular attention is devoted to the ensuing skew discretization error. As an alternative to the commonly adopted uniform distribution of the cross-sections along the shaft, a Gauss distribution is proposed. The application to a squirrel-cage induction motor under various working conditions shows that the latter distribution produces a considerably smaller discretization error. The calculation results are also compared to experimental data.