TY - GEN
T1 - Comparative Study on Stranded and Hairpin Windings for 350kW EV Traction Motor
AU - Jiang, Jianan
AU - Zou, Tianjie
AU - Rocca, Salvatore La
AU - Gerada, David
AU - Gerada, Chris
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - Hairpin winding is a key technology for traction motors to meet the step-change requirements on power density and efficiency in electrical vehicle (EV) industry. This winding solution features inherently high slot fill factor and improved heat dissipation capability when compared to traditional stranded windings. In this paper, a comparative study on randomly stranded and hairpin windings for 350kW heavy duty traction motor solution is presented, with design parameters such as slot-pole combinations and conductor sizes highlighted. Twelve design cases, down selected from multi-physics domain optimization tool, are compared in detail to quantitatively highlight the advantage of the hairpin winding solutions in terms of power density, power losses, and temperature distribution. For hairpin windings, the options of adopting different conductor sizes and parallelly connected conductors in one slot are also investigated, respectively. The comparison results show that the variable conductor size options can reduce the winding AC losses significantly in spite of increased manufacturing cost. It is also revealed that hairpin winding solutions with higher number of slot per pole per phase are more advantageous due to more balanced power loss distributions. Finally, the 72-slot, 8-pole and 96-slot, 8-pole winding solutions are prototyped and will be used for experimental validation.
AB - Hairpin winding is a key technology for traction motors to meet the step-change requirements on power density and efficiency in electrical vehicle (EV) industry. This winding solution features inherently high slot fill factor and improved heat dissipation capability when compared to traditional stranded windings. In this paper, a comparative study on randomly stranded and hairpin windings for 350kW heavy duty traction motor solution is presented, with design parameters such as slot-pole combinations and conductor sizes highlighted. Twelve design cases, down selected from multi-physics domain optimization tool, are compared in detail to quantitatively highlight the advantage of the hairpin winding solutions in terms of power density, power losses, and temperature distribution. For hairpin windings, the options of adopting different conductor sizes and parallelly connected conductors in one slot are also investigated, respectively. The comparison results show that the variable conductor size options can reduce the winding AC losses significantly in spite of increased manufacturing cost. It is also revealed that hairpin winding solutions with higher number of slot per pole per phase are more advantageous due to more balanced power loss distributions. Finally, the 72-slot, 8-pole and 96-slot, 8-pole winding solutions are prototyped and will be used for experimental validation.
KW - AC losses
KW - hairpin winding
KW - iron loss
KW - random winding
KW - thermal performance
UR - http://www.scopus.com/inward/record.url?scp=85182336346&partnerID=8YFLogxK
U2 - 10.1109/ICEMS59686.2023.10345248
DO - 10.1109/ICEMS59686.2023.10345248
M3 - Conference contribution
AN - SCOPUS:85182336346
T3 - 2023 26th International Conference on Electrical Machines and Systems, ICEMS 2023
SP - 4987
EP - 4992
BT - 2023 26th International Conference on Electrical Machines and Systems, ICEMS 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 26th International Conference on Electrical Machines and Systems, ICEMS 2023
Y2 - 5 November 2023 through 8 November 2023
ER -