In this paper, an integrated motor-drive and battery-charging(IMB) system for doubly salient electro-magnet machine(DSEM) is proposed to be implemented onboard for electric vehicles(EV). The field windings distribution of a 12/10 DSEM is arranged for the constant self-inductance, and adopted as the inductance of the front-end DC/DC converter to eliminate the traditional filter inductance and excitation loss of the machine in the driving mode. The armature windings could be exploited as the filter inductances in the charging mode. The simulations and experiments are accomplished to verify the feasibility of the independent field current control method for the proposed system.
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