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World Electric Vehicle Journal is published by MDPI from Volume 9 issue 1 (2018). Articles in this Issue were published by The World Electric Vehicle Association (WEVA) and its member the European Association for e-Mobility (AVERE), the Electric Drive Transportation Association (EDTA), and the Electric Vehicle Association of Asia Pacific (EVAAP). They are hosted by MDPI on mdpi.com as a courtesy and upon agreement with AVERE.
Open AccessArticle

Impact of cut edges on magnetization curves and iron losses in e-machines for automotive traction

1
ArcelorMittal Global R&D Gent, J.F. Kennedylaan 3, BE-9060 Zelzate, Belgium
2
ArcelorMittal Global R&D, J.F. Kennedylaan 51, BE-9042 Gent, Belgium
3
IEM RWTH-Aachen University, Schinkelstrasse 4, DE-52056 Aachen, Germany
*
Author to whom correspondence should be addressed.
World Electr. Veh. J. 2010, 4(3), 587-596; https://doi.org/10.3390/wevj4030587
Published: 24 September 2010
PDF [1713 KB, uploaded 18 May 2018]

Abstract

At last year's edition of EVS, we presented an improved model for iron losses prediction in Permanent Magnet Synchronous Machines (PMSM) [1]. The benefit of this model holds in that it fits more closely the real material behavior than the standard Steinmetz or Bertotti approaches [2], by including 1) magnetic material characteristics measured at high frequency and 2) an improved representation of iron losses at the approach to saturation (by introducing a higher order term in J). We are taking this model a step further by considering now another phenomenon impacting iron losses in electrical machines: the decrease of magnetic permeability and the increase of local hysteresis loss at the vicinity of lamination edges due to the cutting process. This paper presents a quantitative analysis of the impact of lamination processing (cutting, punching, etc) for high quality low loss electrical steels used in automotive traction applications. It is important to perform the analysis over a wide frequency range, because of the large speed range of PMSM drives in automotive applications and the presence of higher harmonics (PWM supply). Our approach consists in measuring the material characteristics for sample sets with different ratios of degraded vs. non degraded material and at various frequencies. Starting from that experimental data we propose a method to determine the local magnetization curves, as function of distance from the cut edge. These local material characteristics can then be implemented in a FE model so that the effect of punching on the machine performance can be determined quantitatively: (1) the cutting impact on magnetization modification allows more precise field calculations; (2) a proposition is made on the implementation of the cutting impact on the loss calculations in post processing via an enhanced version of the loss model developed in [1].
Keywords: Material models for finite element computation; iron losses; magnetization curve; low loss fully processed electrical steels; machine design optimization Material models for finite element computation; iron losses; magnetization curve; low loss fully processed electrical steels; machine design optimization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Vandenbossche, L.; Jacobs, S.; Henrotte, F.; Hameyer, K. Impact of cut edges on magnetization curves and iron losses in e-machines for automotive traction. World Electr. Veh. J. 2010, 4, 587-596.

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World Electr. Veh. J. EISSN 2032-6653 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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