Novel rotor design optimization of synchronous reluctance machine for high torque density

This paper presents a novel method for the torque capability maximization of the synchronous reluctance machine. The macroscopic parameters d- and q-axis insulation ratios, k_wq and k_wd, respectively, are introduced. They describe fully the geometry characteristic of the p-pole pair, two barrier rotor. The presented combined analytical-FEM approach gives the optimal distribution of air and iron for the maximum torque. Saturation effects and other two dimensional nonlinearities are included by a limited number of FEM simulations to determine the best k_wq and k_wd. The method is shown to obtain the maximum torque accurately and fast for a specific stator without directly dealing with the rotor geometry dimensions.