ScholarWorks@경상국립대학교

초록

This paper proposes a hybrid-material hairpin winding structure for high-speed traction motors to reduce AC copper losses. Aluminum conductors are placed near the slot opening, where AC losses are concentrated, and copper conductors are positioned near the back yoke. To further reduce AC losses, an asymmetric bar design is applied to the aluminum conductors, varying their cross-sectional areas while keeping the total area constant. The proposed concept is introduced through slot-level loss analysis and applied to the motor model. Optimization is performed to minimize copper losses at two operating points: base speed (4500 rpm) and high speed (18000 rpm). Finite element simulation results show that the optimized winding configuration achieves a 0.11% efficiency improvement at high speed, with only a minimal efficiency reduction of 0.02% at base speed, confirming the effectiveness of the proposed design.

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