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Filter Influence on Rotor Losses in Coreless Axial Flux Permanent Magnet MachinesSANTIAGO, J. , OLIVEIRA, J. G. , BERNHOFF, H.
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Eddy currents, harmonic filters, permanent magnet machines, power filters, permanent magnets synchronous machine, slotless machines
permanent(9), motor(8), magnet(8), machines(6), synchronous(4), rotor(4), inverter(4), high(4), energy(4)
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About this article
Date of Publication: 2013-02-28
Volume 13, Issue 1, Year 2013, On page(s): 81 - 86
ISSN: 1582-7445, e-ISSN: 1844-7600
Digital Object Identifier: 10.4316/AECE.2013.01014
Web of Science Accession Number: 000315768300014
SCOPUS ID: 84875314441
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.
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