Analytical magnetic field analysis of Halhach magnetized permanent-magnet machines \ud

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Xia, Z.P. ; Zhu, Z.Q. ; Howe, D. (2004)

We develop analytical models for predicting the magnetic field distribution in Halbach magnetized machines. They are formulated in polar coordinates and account for the relative recoil permeability of the magnets. They are applicable to both internal and external rotor permanent-magnet machines with either an iron-cored or air-cored stator and/or rotor. We compare predicted results with those obtained by finite-element analyses and measurements. We show that the air-gap flux density varies significantly with the pole number and that an optimal combination of the magnet thickness and the pole number exists for maximum air-gap flux density, while the back iron can enhance the air-gap field and electromagnetic torque when the radial thickness of the magnet is small.
  • References (9)

    [1] Z. Q. Zhu and D. Howe, “Halbach permanent magnet machines and applications-a review,” Proc. Inst. Elect. Eng.-Electric Power Applications, vol. 148, no. 4, pp. 299-308, 2001.

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    Z.P. Xia received the B.Eng. and M.Sc. degrees from Zhejiang University, Hangzhou, China, in 1982 and 1985, respectively, and the Ph.D. degree from the University of Sheffield, Sheffield, U.K., in 2002, all in electrical and electronic engineering. Since graduation, she has worked at Zhejiang University, China Institute of Metrology, The University of Sheffield, IMRA Europe S.A.S.-U.K. Research Center. Currently, she is a Research Associate at the University of Sheffield, working on the design and analysis of permanent-magnet brushless machines. Z. Q. Zhu (M'90-SM'00) received the B.Eng. and M.Sc. degrees from Zhejiang University, Hangzhou, China, in 1981 and 1984, respectively, and the Ph.D. degree from the University of Sheffield, Sheffield, U.K., in 1991, all in electrical and electronic engineering. From 1984 to 1988, he lectured in the Department of Electrical Engineering at Zhejiang University. Since 1988, he has been with the University of Sheffield, where he is currently Professor of Electrical Engineering. His current major research interests include applications, control, and design of permanent-magnet machines and drives.

    David Howe received the B.Tech and M.Sc. degrees from the University of Bradford, Bradford, U.K., in 1966 and 1967, respectively, and the Ph.D. degree from the University of Southampton, Southampton, U.K., in 1974, all in electrical power engineering. He has held academic posts at Brunel and Southampton universities, and spent a period in industry with NEI Parsons Ltd. working on electromagnetic problems related to turbo-generators. He is currently Professor of Electrical Engineering, Head of the Electrical Machines and Drives Research Group, and Director of the Rolls-Royce University Technology Centre in Advanced Electrical Machines and Drives at the University of Sheffield. His research activities span all facets of controlled electrical drive systems, with particular emphasis on permanentmagnet excited machines. Prof. Howe is a Chartered Engineer, a Fellow of the Royal Academy of Engineering, and a Fellow of the IEE.

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