Comparison of synchronous PM machine types for wide constantpower speed range operation

Purpose The purpose of this paper is to provide a comparison of synchronous permanent magnet machine types for wide constant power speed range operation. Designmethodologyapproach A combination of analytical models and finite element analysis is used to conduct this study. Findings The paper has pre...

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Veröffentlicht in:Compel 2008-09, Vol.27 (5), p.967-984
Hauptverfasser: ELRefaie, Ayman M., Jahns, Thomas M.
Format: Artikel
Sprache:eng
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Zusammenfassung:Purpose The purpose of this paper is to provide a comparison of synchronous permanent magnet machine types for wide constant power speed range operation. Designmethodologyapproach A combination of analytical models and finite element analysis is used to conduct this study. Findings The paper has presented a detailed comparison between various types of synchronous PM machines for applications requiring a wide speed range of constantpower operation. Key observations include surface permanent magnet SPM and interior permanent magnet IPM machines can both be designed to achieve wide speed ranges of constantpower operation. SPM machines with fractionalslot concentrated windings offer opportunities to minimize machine volume and mass because of their short winding end turns and techniques for achieving highslot fill factors via stator pole segmentation. High backemf voltage at elevated speeds is a particular issue for SPM machines, but also poses problems for IPM machine designs when tight maximum limits are applied. Magnet eddycurrent losses pose a bigger design issue for SPM machines, but design techniques can be applied to significantly reduce the magnitude of these losses. Additional calculations not included here suggest that the performance characteristics of the inverters accompanying each of the four PM machines are quite similar, despite the differences in machine pole number and electrical frequency. Research limitationsimplications The paper is targeting traction applications where a very wide speed range of constantpower operation is required. Practical implications Results presented are intended to provide useful guidelines for engineers faced with choosing the most appropriate PM machine for highconstant power speed ratio applications. As in most realworld drive design exercises, the choice of PM machine type involves several tradeoffs that must be carefully evaluated for each specific application. Originalityvalue The paper provides a comprehensive comparison between different types of synchronous PM machines, which is very useful in determining the most suitable type for various applications.
ISSN:0332-1649
DOI:10.1108/03321640810890717