Comparative Study of Stator Partitioned Doubly Salient Permanent Magnet Machines Having Different Numbers of Permanent Magnets and Rotor Iron Pieces

One contrastive research on two stator partitioned doubly salient permanent magnet (PS-DSPM) machines is performed in this essay. The machines have disparate numbers of permanent magnets (PMs) and rotor iron pieces. The conventional numbers of PMs and rotor iron pieces are 4 and 8 while the newly proposed numbers of PMs and rotor iron pieces are 6 and 7. As for an objective contrast, both PSDSPM machines investigated here are optimized for the purpose of attaining a larger average torque based on single-variable optimizing approach under the fixed envelope size and copper loss. Furthermore, several main electromagnetic characteristics of two PS-DSPM machines are contrasted, such as no-load flux linkage, back-electromotive force (back-EMF), torque capability, alongside cogging torque. The comparison consequences illustrate that compared to the PS-DSPM machine with conventional 4 PMs and 8 rotor iron blocks, the PS-DSPM machine with proposed 6 PMs and 7 rotor iron blocks increases average torque by 5.4% and the torque ripple drops dramatically by 149.47%.