Analysis on the influence of winding topology with different phase angle on electromagnetic performance of dual three-phase PMSMs
Due to that dual three-phase permanent magnet synchronous machine(DT-PMSM)can adopt differ-ent phase-shift angle(PH-Angle)between the two sets of three-phase windings,taking a 24-slot 22-pole DT-PMSM as an example,the effect of PH-Angle on the performance of the motor is analyzed.First,based on the phase relationship between the magnetomotive force(MMF)of each slot winding group,the feasible spa-tial PH-Angles between the two sets of three-phase windings,namely 0°,15° and 30°,are derived when sin-gle layer(SL)and double layer(DL)windings are used,and the armature MMF spectrums generated by dif-ferent spatial PH-Angle windings are compared and analyzed.Then,based on the relationship between the ar-mature MMF harmonics and the electromagnetic properties of the motor,the effects of 0°,15° and 30° PH-Angle winding topology on the electromagnetic properties such as the unbalanced magnetic force(UMF),back electromotive force(EMF),average torque,and torque ripple of DT-PMSMs are verified by finite element analysis(FEA).Finally,two prototypes of SL and DL spatial PH-Angle 30° winding are built and tested to validate the effectiveness of the analyses.The results indicate that the 0° PH-Angle winding has the most sig-nificant UMF.The 30° PH-Angle winding has the maximum average torque and minimum torque ripple.
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