Improving Quasi-3D Model for Axial Flux PM Motor by Considering Radial Flux Leakage Path

Abstract

Axial flux permanent magnet motors (AFPM) are increasingly favored for their high torque density and compact structure. However, their complex topology necessitates computationally expensive three-dimensional finite element analysis (3D FEA) for accurate design. While quasi-3D modeling offers a faster alternative by representing the motor in radially sliced two-dimensional (2D) segments, conventional methods often neglect critical phenomena like radial flux leakage, leading to significant inaccuracies in performance predictions. This study introduces an improved quasi-3D model that rectifies this issue by calculating and integrating the permeance of the radial flux leakage path into the analysis. Consequently, the proposed model demonstrates an improved correlation with 3D FEA results. It provides a substantial reduction in computational overhead with a negligible compromise in precision, thereby enabling a more rapid and reliable design optimization process for AFPM motors.