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High Frequency Characterization of Losses in FullyAssembled Stators of Slotless PM Motors
KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems. KTH.ORCID iD: 0000-0001-7677-0683
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-6283-7661
2018 (English)In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367Article in journal (Refereed) Accepted
Abstract [en]

Abstract—The recent emerge of wide band-gap (WBG) powertransistors enables higher switching frequencies in electricalmotor drives. Their full utilization from a system point ofview requires quantification of the corresponding time-harmonicmotor losses. As an initial step, this paper presents a uniquestudy of stator losses for three different commercially availablenon-oriented silicon-iron (SiFe) steel grades (with laminationthicknesses 0.1, 0.2 and 0.3 mm). The investigations cover awide frequency range (10-100 kHz) at different levels of DC-bias(up to 1.6 T). Iron losses are identified from measurements onfully assembled stators, deploying a novel technique. By utilizingfully assembled stators, no additional samples are required.Manufacturing influence is inherently incorporated. Results showthat measured iron losses are twice as high at 10 kHz comparedto Epstein test results, which emphasizes the need to incorporatemanufacturing influence on iron losses at high frequencies. Thelevel of DC-bias is also observed to have a significant impacton iron losses (up to 30 %). Even though thinner laminationsare known for reducing iron losses, the reduction is much lowerthan anticipated in the studied frequency range due to skin effect.Using 0.1 mm lamination gauge instead of 0.3 mm reduces lossesby 50 % at 10 kHz, while the same substitution at 100 kHz onlyreduces losses by 30 %. Future work includes loss separation incomplete converter-fed machines.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2018.
Keywords [en]
Permanent magnet machines, magnetic losses, harmonic analysis, wide band gap semiconductors.
National Category
Energy Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-221831DOI: 10.1109/TIA.2018.2806883ISI: 000433089200032Scopus ID: 2-s2.0-85042198389OAI: oai:DiVA.org:kth-221831DiVA, id: diva2:1177847
Note

QC 20180201

Available from: 2018-01-26 Created: 2018-01-26 Last updated: 2018-06-18Bibliographically approved

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