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Analysis of magnetic gearing effect in partitioned stator switched flux PM machines
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Wu, Zhongze and Zhu, Z. Q. (2016) Analysis of magnetic gearing effect in partitioned stator switched flux PM machines. IEEE Transactions on Energy Conversion, 31 (4). pp. 1239-1249. doi:10.1109/TEC.2016.2590988 ISSN 0885-8969.
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Official URL: http://dx.doi.org/10.1109/TEC.2016.2590988
Abstract
The partitioned stator switched-flux permanent magnet (PM) (SFPM) (PS-SFPM) machine is a novel stator-PM machine in which PMs and armature windings are separately placed in two different stators. Compared with the conventional SFPM machine with a single stator in which both PMs and armature windings are located, the PS-SFPM machine can generate higher torque density due to the utilization of the machine's inner space. In this paper, the magnetic gearing effect in the PS-SFPM machine is investigated in terms of air-gap field harmonics based on a simple magnetomotive force (MMF)-permeance model. It is found that the PS-SFPM machine is one type of magnetically-geared machine, in which the modulations of rotor iron pieces to the open-circuit PM and armature reaction fields are similar to those found in the magnetic gear and the conventional magnetically geared machine. The pole-pair numbers and rotating speeds of the air-gap field harmonics obtained by the MMF-permeance model are verified by finite element (FE) analysis. More than 93% of the average electromagnetic torque is contributed by the main air-gap field harmonics having pole-pair numbers (2i - 1)pPM and |Nr ± (2i-1)pPM| (i = 1,2,3) in a PS-SFPM machine with pPM-pole-pair PMs and Nr-rotor-pole. A prototype machine is fabricated and tested to verify the FE analysis.
Item Type: | Journal Article | ||||||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Journal or Publication Title: | IEEE Transactions on Energy Conversion | ||||||||
Publisher: | IEEE | ||||||||
ISSN: | 0885-8969 | ||||||||
Official Date: | December 2016 | ||||||||
Dates: |
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Volume: | 31 | ||||||||
Number: | 4 | ||||||||
Page Range: | pp. 1239-1249 | ||||||||
DOI: | 10.1109/TEC.2016.2590988 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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