Torque ripple reduction in double-layer 18/16 TC-PMSMs by adjusting teeth widths to minimize local saturation

Ponomarev, Pavel; Petrov, Ilya; Pyrhönen, Juha

doi:10.1109/icelmach.2014.6960374

Cited by 7 publications

(1 citation statement)

References 27 publications

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“…Therefore, both the average torque and torque ripple need to be investigated together. According to the analysis in [14]- [15], the reason for higher torque ripple in electrical machines with alternate teeth wound windings was the higher saturation caused by subharmonic. The torque separation with the help of frozen permeability (FP) method was shown in [16]- [17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Stator Topologies on Average Torque and Torque Ripple of Fractional-Slot SPM Machines With Fully Closed Slots

2018

IEEE Trans. on Ind. Applicat.

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Abstract-This paper investigates the influence of concentrated winding configurations and stator core structures on torque performance of fractional-slot surface-mounted PM (SPM) machines. From analyzing the separated torque components of prototype SPM machines with 12-slots/10-poles (12S/10P) combination by frozen permeability (FP) method, it can be found that the torque ripple is closely related with local saturation in fully closed slot (FCS) machines. Besides, the heavier local saturation will also jeopardize the merit of using alternate teeth wound windings, such as obtaining higher average torque than electrical machines with all teeth wound windings. The further analysis of stator tooth relative permeability variation over one electrical period demonstrates that the major reason for torque ripple difference among these electrical machines with different stator topologies is the asymmetric saturation between the adjacent teeth. Both the subharmonic due to armature reaction (determined by winding connection and current value) and the asymmetry of stator core structure contribute to such asymmetric saturation. In order to more clearly verify this, the complementary slot/pole number combination (12S/14P) is also analyzed. The conclusion is effective for electrical machines with other slot/pole number combinations as well. Experiments have been carried out to validate the predictions.

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