Computation of the No-Load Magnetic Flux Density in an Axial Flux Permanent-Magnet Machine Using Semi-3D Analytical Method

This paper presents a semi-3D analytical method for calculation of the no-load magnetic flux density in an axial flux permanent-magnet machine. This method is based on a 2-D analytical solution of magnetic field and using modulation function for considering machine’s radial effect on magnetic field distribution. Modulation function is obtained analytical and by use of airgap and leakage permeances. This analytical method takes much less computational time than 3-D finite element method (FEM) does, and is, thus, useful for designing and optimization purposes. Finally, the accuracy of the presented analytical model is validated by comparing its results to corresponding finite-element analysis.