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Open AccessArticle

A General Investigation on the Differential Leakage Factor for Symmetrical and Asymmetrical Multiphase Winding Design

1
Department of Engineering, University of Palermo, Viale delle Scienze, Building nr. 9, 90128 Palermo, Italy
2
Department of Electrical and Information Engineering, University of Cassino and South Lazio, via G. Di Biasio 43, 03043 Cassino, Italy
*
Author to whom correspondence should be addressed.
Energies 2020, 13(20), 5414; https://doi.org/10.3390/en13205414
Received: 3 September 2020 / Revised: 7 October 2020 / Accepted: 10 October 2020 / Published: 16 October 2020
(This article belongs to the Special Issue Fail-Safe Electric Drives and Safety-Related Issues)
This work provides an investigation based on a fast estimation of the degree of unbalance (D.U.%) and the differential leakage factor (σ0) of multiphase electrical machine windings. This analysis is carried out by exploring almost 5000 combinations in terms of number of slots, pole pairs, phases and layers. The variability of the leakage factor is examined for each condition, defining an optimal region for its minimization. As a result, an extended mapping is carried out for both the degree of unbalance and the leakage factor, providing a useful tool during the early design stage of winding configurations for multiphase electric machines, even with slight asymmetries. The results obtained from this investigation are validated through finite element analysis and demonstrate that the differential leakage factor can be significantly reduced by adopting winding configurations with slight asymmetries, which also represent a valuable alternative in the electrical machine design. View Full-Text
Keywords: electrical machines; differential leakage factor; symmetrical windings; asymmetrical windings; unbalance degree; winding design electrical machines; differential leakage factor; symmetrical windings; asymmetrical windings; unbalance degree; winding design
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MDPI and ACS Style

Caruso, M.; Di Tommaso, A.O.; Marignetti, F.; Miceli, R. A General Investigation on the Differential Leakage Factor for Symmetrical and Asymmetrical Multiphase Winding Design. Energies 2020, 13, 5414.

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