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Energies 2016, 9(12), 1009; doi:10.3390/en9121009

Development of Correlations for Windage Power Losses Modeling in an Axial Flux Permanent Magnet Synchronous Machine with Geometrical Features of the Magnets

1
Department of Flow, Heat and Combustion Mechanics, Faculty of Engineering and Architecture, Ghent University, B-9000 Ghent, Belgium
2
Department of Electrical Energy, Systems and Automation, Faculty of Engineering and Architecture, Ghent University, B-9000 Ghent, Belgium
3
Flanders Make, the Strategic Research Centre for the Manufacturing Industry, B-8500 Kortrijk, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: David Wood
Received: 13 October 2016 / Revised: 10 November 2016 / Accepted: 25 November 2016 / Published: 30 November 2016
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Abstract

In this paper, a set of correlations for the windage power losses in a 4 kW axial flux permanent magnet synchronous machine (AFPMSM) is presented. In order to have an efficient machine, it is necessary to optimize the total electromagnetic and mechanical losses. Therefore, fast equations are needed to estimate the windage power losses of the machine. The geometry consists of an open rotor–stator with sixteen magnets at the periphery of the rotor with an annular opening in the entire disk. Air can flow in a channel being formed between the magnets and in a small gap region between the magnets and the stator surface. To construct the correlations, computational fluid dynamics (CFD) simulations through the frozen rotor (FR) method are performed at the practical ranges of the geometrical parameters, namely the gap size distance, the rotational speed of the rotor, the magnet thickness and the magnet angle. Thereafter, two categories of formulations are defined to make the windage losses dimensionless based on whether the losses are mainly due to the viscous forces or the pressure forces. At the end, the correlations can be achieved via curve fittings from the numerical data. The results reveal that the pressure forces are responsible for the windage losses for the side surfaces in the air-channel, whereas for the surfaces facing the stator surface in the gap, the viscous forces mainly contribute to the windage losses. Additionally, the results of the parametric study demonstrate that the overall windage losses in the machine escalate with an increase in either the rotational Reynolds number or the magnet thickness ratio. By contrast, the windage losses decrease once the magnet angle ratio enlarges. Moreover, it can be concluded that the proposed correlations are very useful tools in the design and optimizations of this type of electrical machine. View Full-Text
Keywords: AFPMSM; CFD; magnet parameters; windage losses AFPMSM; CFD; magnet parameters; windage losses
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Rasekh, A.; Sergeant, P.; Vierendeels, J. Development of Correlations for Windage Power Losses Modeling in an Axial Flux Permanent Magnet Synchronous Machine with Geometrical Features of the Magnets. Energies 2016, 9, 1009.

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