转子结构参数对离散Halbach阵列磁场分布的影响

Influence of Rotor Structure Parameters on Magnetic Field Distribution of Segmented Halbach Array

利用离散Halbach阵列磁场分布特点,合理选择电机转子结构参数对于发挥永磁体潜力、提高电机系统的整体性能至关重要。文中建立了离散Halbach阵列有限元分析模型,并以一台原理样机的空载电势为依据,验证了模型的正确性。基于该模型的计算结果,着重分析研究了每极磁体数、极对数和磁体厚度对转子轭部磁通、气隙磁密谐波和基波的影响,比较了每极磁体数m≥2与m=1(径向结构)磁性能的差异,并给出了每极磁体数、极对数和磁体厚度的合理取值范围,为设计离散Halbach永磁电机依据。

Magnetic field distribution of segmented Halbach array is influenced by the magnet number per pole. A finite element analysis model based on segmented Halbach array is proposed and then verified by a prototype motor. The rotor yoke flux and air-gap flux density is varied with the magnet number per pole, the pole number and the thickness of the magnet are analyzed, and the differences between the magnet number per pole m≥2 and m= 1 （surface-mounted structure） are illustrated. In addition, the best range of the magnet number per pole, the thickness of magnet and the pole number is provided. The conclusions provide a reference for the design segmented Halbach array.