基于NEDC路谱的对称与非对称型永磁同步电机优化设计

Optimization Design of Symmetrical and Asymmetric Permanent Magnet Synchronous Motor Based on NEDC Driving Cycle

用于电动汽车的永磁同步电机不仅需要考虑额定工况的性能,还需要考虑整个路谱下的综合效率。基于此,介绍了一种基于新标欧洲循环测试(NEDC)路谱的非对称V型内嵌式永磁同步电机优化设计方法。将上述非对称电机中永磁体上下两部分的几何参数分别作为独立参数进行参数化建模,然后以NEDC效率和转矩成本比为优化目标,采用遗传算法分别对对称和非对称V型永磁同步电机进行多目标优化。最后,选取帕累托前沿上的最佳设计点进行电磁性能仿真比较。仿真结果表明,与对称结构相比,非对称转子结构由于磁场偏移效应而表现出更强的转矩性能。因此,非对称V型永磁同步电机具有更加优异的电磁性能和更低的制造成本,在电动汽车领域具有广阔的应用前景。

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.