The Doubly Salient Electromagnetic Motor (DSEM) has a promising application prospect in fields such as new energy vehicles. However, the field windings of DSEM brings high copper loss, and traditional converter topologies and control methods limit the improvement of motor efficiency. In this paper, to improve the efficiency of a four-phase 8/6 pole DSEM, a current coordinated control strategy based on five-leg converter is proposed. This strategy achieves coordinated control of the DSEM positive and negative phase currents and field current by controlling the five-leg switches. Based on the working principles of the converter, the relationship between phase current, field current, and average electromagnetic torque is established through magnetic co-energy. The minimum copper loss current combination is obtained using the Lagrange multiplier method, and a speed closed-loop control is established. Simulation results show that compared with the conventional symmetrical current control, the motor efficiency increases 2.8%, and the system efficiency increases to 80.3%. The proposed control strategy reduces copper loss, and improves motor efficiency and system efficiency without using more power switches.