NDLI: Optimal Split Ratio in Fractional-Slot Interior Permanent-Magnet Machines With Non-Overlapping Windings

Content Provider	IEEE Xplore Digital Library
Author	Wu, L.J. Zhu, Z.Q. Chen, J.T. Xia, Z.P. Jewell, G.W.
Copyright Year	1965
Abstract	The split ratio has been optimized for the maximum torque density when the air-gap flux density is fixed in existing papers. However, the air-gap flux density can vary with the split ratio significantly in interior permanent-magnet (IPM) machines due to flux focusing. Therefore, an optimal air-gap flux density may exist, together with the optimal split ratio, for the maximum torque in IPM machines. This paper analytically optimizes the air-gap flux density and split ratio individually, as well as the global optimum in terms of the torque density in the fractional-slot IPM machines with non-overlapping windings. In addition, the influence of pole-slot combination and tooth-tips on the optimal split ratio and air-gap flux density is discussed. The analytical result is verified by the finite element analysis. It shows that the optimal split ratio reduces with the increase of the air-gap flux density, and the preferred air-gap flux density is around 0.5-0.7 times of maximum flux density in the stator teeth when the rare earth permanent magnets are employed.
Sponsorship	IEEE Magnetics Society
Starting Page	1235
Ending Page	1242
Page Count	8
File Size	1665086
File Format	PDF
ISSN	00189464
Volume Number	46
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Machine windings Air gaps Torque Electromagnetic analysis Magnetic analysis Iron Performance analysis Finite element methods Stators Reluctance motors permanent-magnet motors Permanent-magnet machines
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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