Torque Performance Comparison Between Slotted and Non-Slotted Axial Flux PCB Winding Machine

The aim of this study is to compare the slotted and non-slotted axial flux permanent magnet machines (AFPM) when the printed circuit board (PCB) winding is applied to stator. The machines are designed with different turn numbers because of slot type. It was found that the torque density is higher in the slotted AFPM, also in the slotted machine, higher number of PCB layer can be used to increase torque density because of constant magnetic flux density distribution. On the other hand, torque ripple is reduced when non-slotted machine is used. For small scale applications with high torque density requirements, it is better to use slotted PCB winding machines.