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Energies 2017, 10(3), 379; doi:10.3390/en10030379

Limitations and Constraints of Eddy-Current Loss Models for Interior Permanent-Magnet Motors with Fractional-Slot Concentrated Windings

Department of Electric Power and Energy Systems, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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Received: 2 January 2017 / Revised: 26 February 2017 / Accepted: 11 March 2017 / Published: 16 March 2017
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Abstract

This paper analyzes and compares models for predicting average magnet losses in interior permanent-magnet motors with fractional-slot concentrated windings due to harmonics in the armature reaction (assuming sinusoidal phase currents). Particularly, loss models adopting different formulations and solutions to the Helmholtz equation to solve for the eddy currents are compared to a simpler model relying on an assumed eddy-current distribution. Boundaries in terms of magnet dimensions and angular frequency are identified (numerically and using an identified approximate analytical expression) to aid the machine designer whether the more simple loss model is applicable or not. The assumption of a uniform flux-density variation (used in the loss models) is also investigated for the case of V-shaped and straight interior permanent magnets. Finally, predicted volumetric loss densities are exemplified for combinations of slot and pole numbers common in automotive applications. View Full-Text
Keywords: automotive applications; concentrated windings; eddy current losses; fractional-slot windings; interior permanent-magnet motors automotive applications; concentrated windings; eddy current losses; fractional-slot windings; interior permanent-magnet motors
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MDPI and ACS Style

Zhang, H.; Wallmark, O. Limitations and Constraints of Eddy-Current Loss Models for Interior Permanent-Magnet Motors with Fractional-Slot Concentrated Windings. Energies 2017, 10, 379.

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