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Analysis of air-gap field modulation and magnetic gearing effects in switched flux permanent magnet machines
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Wu, Zhongze and Zhu, Z. Q. (2015) Analysis of air-gap field modulation and magnetic gearing effects in switched flux permanent magnet machines. IEEE Transactions on Magnetics, 51 (5). pp. 1-12. 8105012. doi:10.1109/TMAG.2015.2402201 ISSN 0018-9464.
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Official URL: http://dx.doi.org/10.1109/TMAG.2015.2402201
Abstract
In this paper, switched flux permanent magnet (SFPM) machines are analyzed from the perspective of the air-gap field harmonics. It is found that the modulation of the salient rotor to PM and armature reaction fields in SFPM machines is similar to that of the iron pieces to those fields in the magnetic gear and magnetically geared machine. The magnetic gearing effect is analyzed in SFPM machines with different stator/rotor pole combinations, winding configurations, and stator lamination segment types by a simple magnetomotive force-permeance model, and validated by finite-element (FE) analysis. Different from fractional-slot surface-mounted PM machines in which the working air-gap field harmonic generates 95% of the average electromagnetic torque, 95% of the average electromagnetic torque in SFPM machines having ps stator pole pairs and nr rotor poles are contributed by several dominating field harmonics, i.e., rotating ones with |knr ± (2i - 1)ps| pole pair (k = 1, i = 1, 2, 3) and static ones with (2i - 1)ps pole pair (i = 1, 2, 3). The FE predicted average static torques in SFPM machines are validated by measurements on prototype machines.
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 Magnetics | ||||||||
Publisher: | IEEE | ||||||||
ISSN: | 0018-9464 | ||||||||
Official Date: | May 2015 | ||||||||
Dates: |
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Volume: | 51 | ||||||||
Number: | 5 | ||||||||
Page Range: | pp. 1-12 | ||||||||
Article Number: | 8105012 | ||||||||
DOI: | 10.1109/TMAG.2015.2402201 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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