Compared to traditional windings, hairpin windings feature higher fill factors and increased robustness to mechanical stresses. However, due to the high cross-sectional area of the rectangular conductors, the current density is not uniform when the motor operates at high speeds. To mitigate the skin effect, parallel paths are often required. In this context, an appropriate design analysis and the formulation of suitable connection rules are mandatory. In this paper, the main design issues and the resulting construction aspects of hairpin windings are analyzed. By modeling Joule losses in the hairpin windings as function of the frequency and highlighting the main differences with traditional windings, a set of rules is presented to obtain a correct configuration. Both symmetric and asymmetric bar layouts are considered to point out the optimal configurations that mitigate the skin-effect-driven increase of current density and expose balanced impedances to the parallel paths of phase currents.

Hairpin Winding Technology for Electric Traction Motors: Design, Prototyping, and Connection Rules / Dannier, A.; Di Bruno, F.; Fiume, F.; Fedele, E.; Brando, G.. - (2022), pp. 1170-1175. (Intervento presentato al convegno 2022 International Conference on Electrical Machines, ICEM 2022 tenutosi a esp nel 2022) [10.1109/ICEM51905.2022.9910851].

Hairpin Winding Technology for Electric Traction Motors: Design, Prototyping, and Connection Rules

Dannier A.
Primo
Methodology
;
Fedele E.
Penultimo
Membro del Collaboration Group
;
Brando G.
Secondo
Supervision
2022

Abstract

Compared to traditional windings, hairpin windings feature higher fill factors and increased robustness to mechanical stresses. However, due to the high cross-sectional area of the rectangular conductors, the current density is not uniform when the motor operates at high speeds. To mitigate the skin effect, parallel paths are often required. In this context, an appropriate design analysis and the formulation of suitable connection rules are mandatory. In this paper, the main design issues and the resulting construction aspects of hairpin windings are analyzed. By modeling Joule losses in the hairpin windings as function of the frequency and highlighting the main differences with traditional windings, a set of rules is presented to obtain a correct configuration. Both symmetric and asymmetric bar layouts are considered to point out the optimal configurations that mitigate the skin-effect-driven increase of current density and expose balanced impedances to the parallel paths of phase currents.
2022
978-1-6654-1432-6
Hairpin Winding Technology for Electric Traction Motors: Design, Prototyping, and Connection Rules / Dannier, A.; Di Bruno, F.; Fiume, F.; Fedele, E.; Brando, G.. - (2022), pp. 1170-1175. (Intervento presentato al convegno 2022 International Conference on Electrical Machines, ICEM 2022 tenutosi a esp nel 2022) [10.1109/ICEM51905.2022.9910851].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/901875
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