CJEE

Chinese Journal of Electrical Engineering ›› 2017, Vol. 3 ›› Issue (2): 102-113.

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Magnetomotive Force Harmonic Reduction Techniques for Fractional-Slot Non-Overlapping Winding Configurations in Permanent-Magnet Synchronous Machines

Xiao Chen*, Jiabin Wang   

  1. Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, S3 7HQ, UK
  • Online:2017-09-25 Published:2019-10-31
  • Contact: E-mail: x.chen.1988@ieee.org.
  • About author:Xiao Chen received B.Eng. degree in electrical engineering from Harbin Institute of Technology at Weihai, Weihai, China, in 2009, M.Eng. degree in electrical engineering from Harbin Institute of Technology, Harbin, China, in 2011, and Ph.D degree from University of Sheffield, Sheffield, UK in 2015 respectively. He is currently a research associate in Dept. of Electronic and Electrical Engineering, University of Sheffield, UK. His current research interests include the modeling, design and analysis of permanent-magnet synchronous machines for traction applications. Jiabin Wang received the B.Eng. and M.Eng. degrees from Jiangsu University of Science and Technology, Zhenjiang, China, in 1982 and 1986, respectively, and the Ph.D. degree from the University of East London, London, U.K., in 1996, all in electrical and electronic engineering. Currently, he is a Professor in Electrical Engineering at the University of Sheffield, Sheffield, U.K. From 1986 to 1991, he was with the Department of Electrical Engineering at Jiangsu University of Science and Technology, where he was appointed a Lecturer in 1987 and an Associated Professor in 1990. He was a Postdoctoral Research Associate at the University of Sheffield, Sheffield, U.K., from 1996 to 1997, and a Senior Lecturer at the University of East London from 1998 to 2001. His research interests range from motion control and electromechanical energy conversion to electric drives for applications in automotive, renewable energy, household appliances and aerospace sectors. He is a fellow of the IET and a senior member of IEEE.

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Abstract: Compared to conventional distributed winding configurations, the fractional-slot non-overlapping (concentrated) windings exhibit advantages such as short end-winding length, high copper packing factor (particularly with segmented stator structure), low cogging torque, good field weakening capability owing to relatively large d-axis inductance, and better fault tolerant capability due to low mutual inductance. However, one of the key problems of employing concentrated windings in Permanent-magnet Synchronous Machines(PMSMs) is the high eddy-current losses in rotor magnets and/or rotor iron due to the presence of a large number of lower and higher order space harmonics in the stator Magneto-Motive Force(MMF). These MMF harmonics also result in other undesirable effects, such as acoustic noise and vibrations, and localized core saturation which tend to reduce reluctance torque. This paper reviews the current state-of-the-art of the MMF harmonic reduction techniques for concentrated winding configurations in PMSMs, including winding split and shift, delta-star connected windings, multiple 3-phase windings, multilayer windings, uneven turn numbers, and stator flux barriers. Their concepts, advantages and disadvantages are presented and assessed.

Key words: Magnetomotive force(MMF), fractional-slot windings, concentrated windings, permanent-magnet machines.