Switched Reluctance Motor Drivetrain With Fully Integrated Battery Charger and Instantaneous Zero Charging Torque for Electric Transportation

Abstract

The article proposes an integrated converter (IC) with driving and battery charging features for electric vehicles (EVs) drive-train employing a 4-phase switched reluctance motor (SRM). The proposed IC allows flexible control over the DC link during drive mode, i.e., for motoring, it can boost the battery voltage, and during regenerative braking, it can maintain the battery charging profile. When the EV is standstill/idle, the proposed IC is reconfigured as an integrated single-phase battery charger incorporating two stages. The two-stage battery charger is comprehended by reconstructing the IC proposed into a bridgeless boost power factor correction (BB-PFC) circuit cascaded by a buck DC converter. The active inductors for the BB-PFC circuit are realized via the windings of the employed SRM. Moreover, charging operation is performed at appropriate rotor positions, which results in a net-zero charging torque (ZCT) from the phases reconfigured as inductors. The proposed reconfiguration of inductors allows eight novel rotor positions for charging within an electrical cycle to achieve ZCT with a maximum displacement of 3.75° mechanical for rotor in case any deviation from the charging rotor position. The efficacy of the proposed IC is shown by simulation and experimental verification.