Torque ripple reduction of outer rotor synchronous reluctance machine with concentrated winding

This paper presents the design step of an outer rotor synchronous reluctance machine with concentrated winding. The beginning of the study sets the geometrical and electrical constrains. The first step of design is to determinate the optimum topology with reduced number of pole pair for a higher value of fundamental winding factor. Second step of the study is to identify how different types of rotor pole influence the performance of the electrical machine. The third step is focused to modify geometry of stator tooth's, especially the stator tooth length in order to establish how this parameter influences the electromagnetic torque and torque ripple. Fourth step of analysis has been dedicated to evaluating the performances of the machine: inductance on d and q axis and saliency ratio.