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Investigation of Permanent Magnet Brushless Machines Having Unequal-Magnet Height Pole

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2 Author(s)
Yang Shen ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK ; Zhu, Z.Q.

Since the torque ripple reduction by adopting magnet-shaping methods is often associated with a negative impact on electromagnetic torque as well as increased cost, this paper proposes magnet poles having unequal magnet height, i.e., the Hat- and T-type magnets, together with optimized Halbach magnetization. An analytical model based on subdomain technique is employed for investigation, while its validity is examined by finite-element analysis. It shows that comparing to conventional three-segment Halbach array, Hat-type magnet pole and traditional magnet shapings, T-type magnet pole exhibits significant potential to achieve low torque ripple, high electromagnetic torque, and low magnet usage simultaneously.

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Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 12 )