Variable-Winding-Based Highly Integrated Electric-Drive-Reconstructed System for SRM-Based EVs

This article presents a highly integrated electric-drive-reconstructed system for electric vehicles based on a variable winding structure-based switched reluctance motor (SRM). In motor driving mode, the implementation of bipolar current excitation and regenerative braking offers significant advantages in terms of balanced switching loss and heat dissipation. The series-connected and the series and parallel-connected winding structures are adopted for enhanced torque and extended speed requirements, respectively. In single-phase charging mode, a front-stage bridgeless interleaved totem-pole power factor corrector and a back-stage Buck–Boost converter are, respectively, obtained by multiplexing and reconstructing SRM windings and converter devices to reduce the ripple of input ac current. In three-phase charging mode, a front-stage three-phase four-bridge converter and a back-stage Buck converter are reconstructed to solve the issue of grid-side filter inductance imbalance. The unit power factor is achieved. The zero-torque charging is achieved without extra clamping devices under the adopted positioning strategy in both single-phase and three-phase charging. A proof-of-concept prototype platform is built based on a 1 kW three-phase 12/8 SRM to validate the effectiveness and feasibility of the proposed scheme.