Electromagnetic Analysis of YASA Axial Flux Motor Using Harmonic Modeling Considering Non-Linear Core Permeability

Abstract

This study presents a 2-D harmonic modeling (HM) approach for analyzing the non-linear permeability of the core in a yokeless and segmented armature (YASA) axial flux motor. The proposed method formulates Maxwell’s equations in cylindrical coordinates using complex Fourier series and the Cauchy product, effectively addressing local saturation effects. To validate the model, a 3-D finite element method (FEM) analysis was conducted, demonstrating good agreement with the proposed approach. In particular, the HM approach reduces computational time by up to 30 times compared to conventional FEM simulations, making it a promising tool for motor pre-design and optimization in high-value applications that require 3-D analysis.