The Currents Coordinative Control Strategy for Integrated Motor-Drive and Battery-Charging System Based on the Split-Field-Winding DSEM in Driving Mode

This article proposes a currents coordinative control strategy for the integrated motor-drive and battery-charging system based on the split-field-winding doubly salient electromagnetic machine (DSEM) in driving mode, where the field windings are reused as the filter inductance of the front-end dc–dc converter. The combined strategy of maximum field current and the minimum copper loss control methods with respect to the error between the reference and feedback speed of DSEM is given. Compared to the traditional constant field control of DSEM, the copper loss in steady-state operation could be reduced significantly for higher efficiency, especially in light load conditions, and the maximum output power could also be obtained to improve the dynamic performance of the proposed system. The effectiveness and reliability of the proposed control strategy are verified by simulation and experiment results.