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Browse Journals & Magazines > Industry Applications, IEEE T ...> Volume:41 Issue:3 Help

Optimal flux weakening in surface PM machines using fractional-slot concentrated windings

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2 Author(s)
EL-Refaie, A.M. ; Dept. of Electr. & Comput. Eng., Univ. of Wisconsin, Madison, WI, USA ; Jahns, T.M.

A design approach is presented for achieving optimal flux-weakening operation in surface permanent-magnet (SPM) synchronous machines by properly designing the machine's stator windings using concentrated, fractional-slot stator windings. This technique makes it possible to significantly increase the machine inductance in order to achieve the critical condition for providing wide speed ranges of constant-power operation. The conditions for optimal flux weakening can be achieved while simultaneously delivering sinusoidal line-to-line back-electromotive-force waveforms and low cogging torque. A closed-form analytical model is described that can be used to design SPM machines to achieve optimal flux-weakening conditions. This technique is applied to design a 6-kW SPM machine that achieves constant-power operation over a wide speed range. Performance characteristics of this machine are compared using both closed-form and finite-element analysis.

Published in:
Industry Applications, IEEE Transactions on  (Volume:41 ,  Issue: 3 )

Date of Publication: May-June 2005

Page(s):
790 - 800
ISSN :
0093-9994
INSPEC Accession Number:
8628194
Digital Object Identifier :
10.1109/TIA.2005.847312
Product Type:
Journals & Magazines
Date of Current Version :
23 May 2005
Issue Date :
May-June 2005
Sponsored by :
IEEE Industry Applications Society

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