Torque production capabilities of electrical machines with planar windings

This paper describes the torque production capabilities of electrical machines with planar windings and presents an automated procedure for coils conductors´ arrangement. The procedure has been applied on an ironless axial flux slotless permanent magnet machines having stator windings realized using printed circuit board (PCB) coils. An optimization algorithm has been implemented to find a proper arrangement of PCB traces in order to find the best compromise between the maximization of average torque and the minimization of torque ripple. A time-efficient numerical model has been developed to reduce computational load and thus make the optimization based design feasible.