Permanent magnet synchronous motors used in electric vehicles are needed to consider not only the performance under rated operating conditions, but also the overall efficiency across the entire road spectrum. Based on this, an optimal design method for asymmetric V-shaped interior permanent magnet synchronous motor based on new European driving cycle (NEDC) driving cycle is introduced. The geometric parameters of the upper and lower parts of the permanent magnet in the above asymmetric motor are parametrically modeled as independent parameters. Taking the NEDC efficiency and torque-cost ratio as the optimization objectives, the genetic algorithm is used to optimize the symmetric and asymmetric V-shaped permanent magnet synchronous motors, respectively. Finally, the optimal design point on the Pareto front is selected for comparison of electromagnetic performance. The simulation results show that compared with the symmetrical structure, the asymmetrical rotor structure exhibits stronger torque performance due to the magnetic field offset effect. Therefore, the asymmetric V-shaped permanent magnet synchronous motor exhibits better electromagnetic performance and lower manufacturing cost, and has a broad application prospect in the field of electric vehicles.