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Investigation of Harmonic Losses in a 2-PoleSlotless Permanent-Magnet Motor due to WideBand-Gap Inverter Supply
KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.ORCID iD: 0000-0001-7677-0683
KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-6283-7661
Warwick University.ORCID iD: 0000-0002-8990-3745
2019 (English)In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948Article in journal (Refereed) Accepted
Abstract [en]

The recent emerge of wide band-gap powerdevices enables higher switching frequencies in electric motor drives. The subsequent possibility for higher efficiencyand smaller size requires accurate prediction of harmonic losses in motors. Therefore this paper presents an original analysis of harmonic losses arising in inverter-fed 2-pole slotless permanent-magnet machines with axially segmented ring magnets. The developed three-dimensional time-efficient numerical model is successfully validated under high-speed no-load operation using a silicon-carbide based three-phase inverter and rotors carrying a broad range of magnet segment thicknesses (3–12.6 mm). The model enables harmonic loss prediction capability (including loss separation) with an accuracy of 15 % over a wide frequency range (8–120 kHz), which is a unique contribution. The sensitivity analysis primarily emphasizes the importance of taking into account the axial segmentation, and secondarily the rotor-shaft magneto-elasticity effects for accurate modeling of harmonic losses. The conducted case-study demonstrates that wide band-gap transistors effectively can contribute to eliminating the need for inductive filters in motor drives.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Time-harmonic losses, permanent-magnet machines, wide band-gap semiconductors
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-259945DOI: 10.1109/TIE.2019.2939985OAI: oai:DiVA.org:kth-259945DiVA, id: diva2:1353821
Note

QC 20190925

Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2019-10-09Bibliographically approved

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