Analytical Method-Based Optimization Design of Wide High-Efficiency Area about Automotive Permanent Magnet Hub Motor

In order to obtain a permanent magnet hub motor for vehicles with wide high-efficiency area, the dimensional equations of the direct design for the outer rotor hub motor considering the influence of non-ideal waveforms are derived in this paper. Based on the distribution of the working point of the load map, the weight coefficient is introduced, and the idea of "equivalent efficiency" is adopted to rapidly evaluate the high-efficiency index of the motor working area. Taking an outer rotor hub motor running under NEDC for example, the analytical method is used to optimize the size of the prototype and analyze the influence of multi-parameters on the high-efficiency area of the motor. Finally, a 36-slot 48-pole outer rotor hub motor was optimized. The experimental results of the prototype were in great agreement with the finite element simulation data which verified the feasibility of the method.