Traction torque control for HEV applications driven by an IPMSM using pre-set optimized flux linkage tables

Series hybrid electric vehicles (HEVs) have a power-train structure in which the engine, battery, generator, and traction motor are connected in series. As a result, the operational performance of HEVs depends on the performance of the traction machine. This paper proposes a traction torque control method for a series HEV application driven by an interior permanent-magnet synchronous machine (IPMSM). To this end, the method to preset the optimized flux linkage table was applied on the basis of the machine design data for torque control. The proposed method was verified by a test using a 120kW IPMSM.