NDLI: New interior PM rotor design with high flux-weakening capability

Content Provider	IEEE Xplore Digital Library
Author	Pouramin, A. Madani, S.M.
Copyright Year	2009
Description	Author affiliation: Isfahan University of Technology, Faculty of Electrical and Computer Engineering, 84156-8311, Iran (Pouramin, A.; Madani, S.M.)
Abstract	Interior permanent magnet (IPM) synchronous machines attract attentions, due to their excellent torque/power density and high efficiency. Comparing to surface PM (IPM) machines, interior PM machines has higher flux weakening capability at high speed, which is suitable for vehicles. It is of interest to keep Constant Power Speed Range (CPSR) condition in wide speed range. Magnet segmentation proposed by several authors to increase IPM flux weakening capability. The basic idea is to provide proper paths for the stator d-axis flux (Ld*Id) (or increasing d-axis inductance Ld) by thin iron-bridge between magnet segmentations. This paper proposes a new IPM rotor design which improves flux weakening while keeping rated torque at low speed. First, the sensitivity of negative d-axis current id in decreasing air-gap flux is evaluated by FEA. Then optimum positioning and sizes of new magnet-segmentations, air-bridges and iron-bridges are presented. The optimization result in removing the iron-bridge at the outer rotor circumference and adding equivalent iron-bridge width in between magnet segmentations. This has same mechanical rotor integrity strength while providing flux weakening without decreasing rated torque. Finally, the torque-speed characteristic is obtained and compared with similar method.
Starting Page	958
Ending Page	963
File Size	690786
Page Count	6
File Format	PDF
ISBN	9781424442515
DOI	10.1109/IEMDC.2009.5075320
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-05-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic flux Torque Saturation magnetization Stators Air gaps Bridges Reluctance motors Permeability Magnetic flux density Power engineering computing
Content Type	Text
Resource Type	Article

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