Analytical Design of a High Torque Density In-Wheel YASA AFPM Motor

The following paper presents an analytical design approach of a Yokeless and Segmented Armature Axial Flux Permanent Magnet (YASA AFPM) in-wheel motor for automotive applications. Making use of the sizing equations, some key design parameters are linked to the heat transfer thermal circuit equations. The procedure allows to retrieve the design quantities which satisfy both the thermal and electromagnetic constraints. Finally, an approach to obtain the winding data and a brief analysis of the overload thermal condition are presented.