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Filter Influence on Rotor Losses in Coreless Axial Flux Permanent Magnet Machines
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2013 (English)In: Advances in Electrical and Computer Engineering, ISSN 1582-7445, E-ISSN 1844-7600, Vol. 13, no 1, 81-86 p.Article in journal (Refereed) Published
Abstract [en]

This paper investigates the eddy current losses induced in the rotor of coreless Axial-Flux machines. The calculation of eddy currents in the magnets requires the simulation of the inverter and the filter to obtain the harmonic content of the stator currents and FEM analysis of the magnets in the rotor. Due to the low inductance in coreless machines, the induced eddy current losses in the rotor remain lower than in traditional slotted machines. If only machine losses are considered, filters in DC/AC converters are not required in machines with wide airgaps as time harmonic losses in the rotor are very low. The harmonic content both from simulations and experimental results of a DC/AC converter are used to calculate the eddy currents in the rotor magnets. The properties of coreless machine topologies are investigated and some simplifications are proposed for time efficient 3D-FEM analysis. The time varying magnetic field can be considered constant over the magnets when the pole is divided in several magnets. The simplified FEM method to calculate eddy current losses is applicable to coreless machines with poles split into several magnets, although the conclusions are applicable to all coreless and slotless motors and generators.

Place, publisher, year, edition, pages
2013. Vol. 13, no 1, 81-86 p.
Keyword [en]
Eddy currents, harmonic filters, permanent magnet machines, power filters, permanent magnets synchronous machine (PMSM), slotless machines
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
URN: urn:nbn:se:uu:diva-198062DOI: 10.4316/AECE.2013.01014ISI: 000315768300014OAI: oai:DiVA.org:uu-198062DiVA: diva2:615333
Available from: 2013-04-09 Created: 2013-04-08 Last updated: 2017-12-06Bibliographically approved

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de Santiago, JuanGoncalves de Oliveira, JanainaBernhoff, Hans

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