Investigation of UCG and Three-Phase SC Fault Response of Three Motor Drive Configurations for EV Applications

초록

This paper investigates the fault responses of three EV traction drive topologies, half-bridge Y-connection (HBY), open-end winding (OEW) and series-end winding (SEW), under two critical fault scenarios: uncontrolled-generator (UCG) mode and symmetrical three-phase short-circuit (3-ph SC) conditions. A 48-slot, 8-pole interior permanent magnet (IPM) traction motor serves as the basis for the analysis. In both UCG and 3-ph SC faults, the OEW and SEW topologies exhibit zerosequence current loops, which amplify transient current ripple and elevate negative d-axis current peak compared to the HBY configuration. Simulation results showed that OEW and SEW had 8.1% and 9.7% higher d-axis current peaks, respectively, compared to the values observed in HBY. These results highlight the importance of zero-sequence current loops in accurately predicting fault-induced current behavior, especially for topologies that inherently allow for them. © 2025 Korean Institute of Electrical Engineers Electrical Machinery and Energy Conversion Systems Society.

키워드