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Incorporating lamination processing and component manufacturing in electrical machine design tools
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0002-8990-3745
2007 (English)In: Conference Record: IAS Annual Meeting, 2007, 94-102 p.Conference paper (Refereed)
Abstract [en]

Measures to improve the modeling of steel-sheet laminations in electrical machine design tools are studied. Only the magnetic properties, namely, the permeability (BH curves) and the iron losses are addressed. The sensitivity of these properties upon dimensional, directional (anisotropy) and excitation variations, as well as upon the electrical machines manufacturing steps is evaluated. The studied electrical machines manufacturing step are: guillotine, laser-cutting, welding, pressing and punching. The properties of the delivered lamination coils and the various associated loss figures are also statistically benchmarked. The focus is on finding guidelines for incorporation of these sensitivities in design tools when needed. For this purpose, 5 Hz to 10 kHz tests are conducted on Epstein strips, on L-shaped segments and on standard stator laminations. Two different steel grades are studied. It is shown that the lateral dimension, anisotropy and welding influences are much more pronounced then those for punching, pressing and laser cutting and hence, need to be addressed in design tools. It is found that the commonly used Epstein test results of the coils are slightly inferior to the mean loss value of the online-testing (losses that are measured at every 1 m of the entire coil length). It is also noted that, the delivered laminations are almost always better than those ordered and the losses for each individual lamination coil are nearly constant.

Place, publisher, year, edition, pages
2007. 94-102 p.
Keyword [en]
Electrical steel, Hysteresis curves, Iron losses, Laser-cutting, Manufacturing, Punching, Relative permeability, Welding
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-61385ISI: 000260446900016ScopusID: 2-s2.0-48949100289ISBN: 978-142440364-6ISBN: 1424403642OAI: diva2:479046
42nd Annual Meeting of the IEEE-Industry-Applications-Society, New Orleans, LA, SEP 23-27, 2007
QC 20120124Available from: 2012-01-17 Created: 2012-01-17 Last updated: 2012-01-24Bibliographically approved

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Soulard, Juliette
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