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稀土钻永磁体具有非常高的内禀矫顽力,稀土永磁组件一经磁化,就很难退磁。所以,它们是制造直流力矩电动机最合适的永磁材料。然而,为了充分利用昂贵的稀土永磁体,在直流力矩电动机的传统磁结构中,直接用稀土永磁体取代铝镍钴磁钢是不适宜的。为了得到合理的气隙磁通分布,本文提出一种优化直流力矩电动机的稀土永磁结构的机辅设计方法。在机辅设计时,用有限元法来预测磁场图形。最后,磁场计算结果与电动机的试验数据作了比较。
Rare earth permanent magnet drilling has a very high intrinsic coercivity, rare earth permanent magnet components after magnetization, it is difficult to demagnetization. Therefore, they are the most suitable permanent magnet materials for making DC torque motors. However, in order to make full use of expensive rare earth permanent magnets, it is not suitable to replace the AlNiCo magnets with rare earth permanent magnets directly in the conventional magnetic structure of a DC torque motor. In order to obtain a reasonable air gap flux distribution, this paper presents a machine auxiliary design method to optimize the rare earth permanent magnet structure of DC torque motor. In machine design, the finite element method is used to predict the magnetic field pattern. Finally, the magnetic field calculation results are compared with the experimental data of the motor.