Details
| Original language | English |
|---|---|
| Title of host publication | 2021 IEEE International Electric Machines and Drives Conference (IEMDC 2021) |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| ISBN (electronic) | 9781665405102 |
| ISBN (print) | 978-1-6654-4628-0 |
| Publication status | Published - 2021 |
| Event | 2021 IEEE International Electric Machines and Drives Conference, IEMDC 2021 - Hartford, United States Duration: 17 May 2021 → 20 May 2021 |
Abstract
Hairpin windings are widely used in automotive traction motors due to their high slot fill factor and their highly automated manufacturing process. The hairpins are arranged in layers in the stator slots, which offer additional degrees of freedom compared to conventional stranded wire windings in the design process. However, a circulating current within the parallel branches can occur, if the electromagnetic force or the effective branch resistance of each parallel branch differs. Consequently, several design rules have been formulated in the past. In this research, designs of short-pitched and full-pitched hairpin windings are presented and their excitation of circulating currents is evaluated. Time-transient finite element analyses of the current displacement effects in hairpin conductors in a single slot and in an exemplary machine are performed. It is shown that commonly applied design guidelines are not sufficient to fully prevent circulating currents. As a consequence, the definitions of weak and strong symmetry are suggested, the latter of which ensuring that circulating currents are not excited.
Keywords
- circulating currents, Current displacement, electric vehicle, hairpin windings, winding design
ASJC Scopus subject areas
- Energy(all)
- Energy Engineering and Power Technology
- Engineering(all)
- Electrical and Electronic Engineering
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Safety, Risk, Reliability and Quality
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2021 IEEE International Electric Machines and Drives Conference (IEMDC 2021). Institute of Electrical and Electronics Engineers Inc., 2021. 9449604.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Evaluation of Winding Symmetry and Circulating Currents of Hairpin Windings
AU - England, Marc
AU - Dotz, Boris
AU - Ponick, Bernd
PY - 2021
Y1 - 2021
N2 - Hairpin windings are widely used in automotive traction motors due to their high slot fill factor and their highly automated manufacturing process. The hairpins are arranged in layers in the stator slots, which offer additional degrees of freedom compared to conventional stranded wire windings in the design process. However, a circulating current within the parallel branches can occur, if the electromagnetic force or the effective branch resistance of each parallel branch differs. Consequently, several design rules have been formulated in the past. In this research, designs of short-pitched and full-pitched hairpin windings are presented and their excitation of circulating currents is evaluated. Time-transient finite element analyses of the current displacement effects in hairpin conductors in a single slot and in an exemplary machine are performed. It is shown that commonly applied design guidelines are not sufficient to fully prevent circulating currents. As a consequence, the definitions of weak and strong symmetry are suggested, the latter of which ensuring that circulating currents are not excited.
AB - Hairpin windings are widely used in automotive traction motors due to their high slot fill factor and their highly automated manufacturing process. The hairpins are arranged in layers in the stator slots, which offer additional degrees of freedom compared to conventional stranded wire windings in the design process. However, a circulating current within the parallel branches can occur, if the electromagnetic force or the effective branch resistance of each parallel branch differs. Consequently, several design rules have been formulated in the past. In this research, designs of short-pitched and full-pitched hairpin windings are presented and their excitation of circulating currents is evaluated. Time-transient finite element analyses of the current displacement effects in hairpin conductors in a single slot and in an exemplary machine are performed. It is shown that commonly applied design guidelines are not sufficient to fully prevent circulating currents. As a consequence, the definitions of weak and strong symmetry are suggested, the latter of which ensuring that circulating currents are not excited.
KW - circulating currents
KW - Current displacement
KW - electric vehicle
KW - hairpin windings
KW - winding design
UR - http://www.scopus.com/inward/record.url?scp=85112851187&partnerID=8YFLogxK
U2 - 10.1109/IEMDC47953.2021.9449604
DO - 10.1109/IEMDC47953.2021.9449604
M3 - Conference contribution
AN - SCOPUS:85112851187
SN - 978-1-6654-4628-0
BT - 2021 IEEE International Electric Machines and Drives Conference (IEMDC 2021)
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2021 IEEE International Electric Machines and Drives Conference, IEMDC 2021
Y2 - 17 May 2021 through 20 May 2021
ER -