Reduction of Cogging Torque in Interior-Magnet Brushless Machines

Z. Q. Zhu, S. Ruangsinchaiwanich, N. Schofield, D. Howe

    Research output: Contribution to journalArticlepeer-review


    The cogging torque in a four-pole interior-magnet brushless machines was described. It was shown that, by appropriately defining the pole-arc to pole-pitch ratio, the optimal pole-arc to pole-pitch ratio for minimum cogging toque is equally applicable to interior-magnet machines. The results showed that the cogging torque in machines with nonoverlapping windings is approximately half of that in similar machines having overlapping windings.
    Original languageEnglish
    Pages (from-to)3238-3240
    Number of pages2
    JournalIeee Transactions on Magnetics
    Issue number5
    Publication statusPublished - Sept 2003


    • Brushless machines
    • Cogging torque
    • Permanent magnets
    • Permanent-magnet machines


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