Open-Circuit Magnetic Field Analysis of Axial Flux Permanent Magnet Machine using 3D Analytical Approach

In this study, we investigated an analytical approach for performing the electromagnetic field analysis of an axial flux permanent magnet machine (AFPM). Due to the mechanical specificity of AFPMs, three-dimensional (3D) analysis is essential, so we proposed an analytical method to consider the effect of leakage and fringing in the r-direction. Initially, we defined the simplified model and the analysis regions for considering the slotting effect of stator structure, which is an analytical method in the (i, z) plane. Using a similar approach, a simplified model and analysis domains were defined on the (r, z) plane. Additionally, results for a 3D analytical approach were derived based on these findings. Finally, the analytical results of flux density were compared with the 3D finite element analysis results, and the validity was verified.