Analysis of Split-Tooth Stator-Slot Permanent-Magnet Machines With Different PM Arrangements

In this article, the split-tooth stator-slot permanent-magnet (ST-SSPM) machines with different permanent magnet (PM) arrangements are comprehensively analyzed. Four types of ST-SSPM machines are first introduced and classified by the positions and polarities of PMs. Then, the operation principles are elaborated and the slot–pole combinations are derived from the view of the field modulation theory. Besides, four types of ST-SSPM machines with different slots and rotor poles are globally optimized to achieve maximum torque and minimum torque ripple. Furthermore, the electromagnetic performances of the optimal designs are thoroughly analyzed by using the finite-element analysis (FEA), including the cogging torque, back electromotive force (EMF), steady torque, PM utilization ratio, loss, efficiency, and PM demagnetization. Finally, some conclusions are drawn based on the optimal designs and analyzed results.