PM Eddy Current Loss Calculation Based on Magductance for FSPM Machine

This paper proposes a novel model for calculating eddy current losses (ECL) in permanent magnets (PMs) using the principle of magductance. The focus is on integrating magductance elements into the 2D electromagnetic field finite element method (FEM) analysis, thereby enabling simultaneous consideration of eddy current reactions, iron nonlinearity and saturation effects. The proposed method is based on the 2D distribution of eddy currents within the PMs, accounting for both axial and radial segmentations. Firstly, the analytical expression for the magductance corresponding to the PM eddy current reaction in a flux switched permanent magnet (FSPM) motor is derived based on the magductance principle. Secondly, the magductance is integrated into the 2D electromagnetic field FEM model with equivalent windings corresponding to the magductance added to the model. According to the magductance principle, the Joule losses of the magductance windings can be regarded as the PM ECL. Finally, the accuracy of the proposed method is validated through 3D electromagnetic field FEM analysis and experimental results.