Rotor Losses Measurements in an Axial Flux Permanent Magnet Machine

MMF space harmonics and slot openings produce considerable rotor losses in permanent magnet (PM) machines, especially if fractional-slot windings are adopted. This paper aims to measure the rotor losses of a 12-slot 10-pole axial flux phase modulation machine. Both MMF space harmonics and slot openi...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2011-06, Vol.26 (2), p.639-645
Main Authors: Alberti, L, Fornasiero, E, Bianchi, N, Bolognani, S
Format: Article
Language:English
Subjects:
Activation
Analytical models
Coils (windings)
Disks
Experimental tests
Flux
fractional-slot windings
Harmonic analysis
Harmonics
Iron
Loss measurement
Mathematical analysis
permanent magnet (PM) machines
Permanent magnets
rotor losses
Rotors
Stator windings
variable speed drives
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Summary:MMF space harmonics and slot openings produce considerable rotor losses in permanent magnet (PM) machines, especially if fractional-slot windings are adopted. This paper aims to measure the rotor losses of a 12-slot 10-pole axial flux phase modulation machine. Both MMF space harmonics and slot openings are considered. The prototype is an axial flux machine with open slots, equipped with three different rotor disks: a disk without PMs, a disk with energized PMs, and a disk with de-energized PMs. A three-layer analytical model is used to interpret the experimental results, e.g., to split the losses in the different parts of the rotor.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2010.2096818