Comparative Analysis of Dual-Stator Permanent Magnet Machines With Squirrel Stator Teeth Designed in Hypotenuse

The new dual-stator permanent magnet machines with squirrel stator teeth designed in hypotenuse (SSTH-DSPMM) are designed and analyzed, which are suitable for the demand of high torque quality in electric vehicle application. The hypotenuse in SST is designed for regulating the harmonic distribution and suppressing harmonic distortion of airgap flux density to achieve the merits of low cogging torque and low torque ripple. The designed SST can be considered as combinations of rectangle and triangle, which form trapezoid- and parallelogram-shaped stator teeth. The paper forces on the comparative analysis of three representative SSTH-DSPMM and the conventional DSPMM with rectangle squirrel stator teeth using finite element analysis (FEA). For a fair comparison, the investigated four machines are designed with identical key parameters. The FEA-analyzed results of cogging torque, steady torque at rated state and torque ripple can verify the superiority of the designed SSTH-DSPMMs.