Analysis of Multi-phase and Multi-layer Factional-Slot Concen-trated- Winding on PM Eddy Current Loss Considering Axial Segmen-tation and Load Operation

The PMs eddy-current loss of the 12-slot 10-pole machine with multiphase and multilayer windings are mainly investigated using the 3-D finite element analysis (FEA) in this paper. PMs eddy-current losses considering axial segmentation of PM is also analyzed. It is demonstrated that dual-three-phase four-layer (DTP-FL) winding layout has minimum value of the PM eddy current loss with segmentation number N=4. DTP-FL winding layout has smaller magnitude of high-order MMF harmonics. PMs eddy-current paths are divided into smaller loops, which increase the effective resistance. Finally, the average torque and torque ripple changing with multiphase, multilayer and axial segmentation are obtained.