Analytical Modeling of Angular Misalignment for Axial Flux PM Machines: Effects on Cogging Torque

In this paper, an improved semi-analytical model is proposed to investigate the cogging torque of axial flux permanent magnet (AFPM) machine under angular misalignment. First, the axial and circumferential flux density in the airgap under healthy condition is developed by Maxwell's equations and Schwarz-Christoffel (SC) mapping. Second, the SC mapping in MATLAB toolbox is modified to consider the angular misalignment which could improve the accuracy. The results show that the analytical predictions agree well with the finite element (FE) results, also, the model is verified via the performance of experimental results. The main contribution of this paper is that the approach developed in this paper is more accuracy for angular misalignment, especially for the flux densities in the airgap.