Comparison of two Anisotropic Layer models applied to induction motors

A general description of the Anisotropic Layer Theory, derived in the polar coordinate system, and applied to the analysis of squirrel-cage induction motors (IMs), is presented. The theory considers non-conductive layers, layer with predefined current density and layers with induced current density. The electromagnetic field equations are solved by means of Fourier analysis. Further, we propose two different magnetic models for IMs, namely the Direct Rotor Current (DRC) model and the Indirect Rotor Current (IRC) model. The magnetic models are coupled to the single phase equivalent circuit by means of an iterative algorithm, which also accounts for saturation of the main flux path. Finally, motor parameters are given for a benchmark motor and the DRC model and IRC model are validated against Finite Element Analysis predictions. Comparison of the validation results shows that the IRC model is the most promising one.