Axial Flux Permanent Magnet FSCW Machine Decoupling Unbalance Magnetic Force

In this study, we investigated spatial distribution of the unbalance magnetic force (UMF) in the air gap and how this force decouples on a rotor according to different types of the axial flux permanent magnet machines. The general expression of UMF uses the Maxwell stress tensor (MST) to show asymmetric force distribution. We also compared four topologies of UMF using Virtual work methods. Our results show that the double stator type can robustly decouple UMF.