Reduction of Cogging Torque in Interior-Magnet Brushless Machines

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

Research output: Contribution to journalConference articlepeer-review

106 Citations (Scopus)


An investigation into the cogging torque in a four-pole interior-magnet brushless machines having either a six-slot stator and a short-pitched nonoverlapping winding or a 12-slot stator and a full-pitched overlapping winding is described. It is shown by finite-element analyses and measurements that, by appropriately defining the pole-arc to pole-pitch ratio, the optimal pole-arc to pole-pitch ratio for minimum cogging torque, which has been derived for surface-mounted magnet machines, is equally applicable to interior-magnet machines.
Original languageEnglish
Article number1233357
Pages (from-to)3238-3240
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 II
Publication statusPublished - 23 Sep 2003
Externally publishedYes
EventInternational Magnetics Conference - Boston Marriott Copley Place, Boston, United States
Duration: 30 Mar 20033 Apr 2003


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