Robust OEWIM Drive for Optimized EV Powertrain Performance with DTC and ZSV Mitigation

Electric vehicle (EV) powertrain optimization demands long-range capabilities and superior efficiency from low-voltage motors. Open-end winding induction motors (OEWIMs) driven by dual inverters traditionally address this need, but at the cost of higher component count, inverter losses, and state-of-charge (SOC) balancing challenges. To mitigate these issues, we propose a novel 4-half-bridge (4-HB) inverter fed OEWIM configuration used for EV applications. The proposed topology significantly reduces switching devices, improving the loss, highly efficient operation. Furthermore, an enhanced Direct Torque Control (DTC) strategy is proposed, incorporating a comprehensive analysis of Common Mode Voltage (CMV) reduction and Zero Sequence Voltage (ZSV) mitigation. This optimized DTC ensures peak torque performance across various speed ranges. Our approach tackles both SOC balancing difficulties and inverter loss minimization in OEWIM-based EVs, ultimately facilitating an extended driving range. Comprehensive HIL results verify the effectiveness of the proposed 4-HB inverter and the enhanced DTC technique.