Improving the energy consumption rate of electric vehicles is a critical challenge for extending driving range and enhancing battery performance. In this study, an interior permanent magnet synchronous motor was designed, and efficiency maps were derived for four motor models with variations in permanent magnet, conductor, and core materials. By applying the US06, HWFET, FTP-75, and WLTC driving cycles to an EV system model, battery ECR was compared, revealing that the motor with modified permanent magnet material generally exhibited lower energy consumption and superior efficiency. This research clarifies that EV energy consumption characteristics are determined by the interaction between the efficiency map's shape and the distribution of operating points in actual driving cycles, rather than by the maximum efficiency at a single operating point. Consequently, this study suggests the necessity of a system-level motor design strategy that accounts for real-world driving conditions.
Kim et al. (Thu,) studied this question.