弓形磁极永磁电机谐波削极技术的优化研究

Research on the Optimization of Harmonic Pole Shaping Technologies for Arcuate Pole Permanent Magnet Motors

为实现电机高功率密度和低转矩脉动的双重设计目标,该文在考虑永磁体相对磁导率、定子开槽、极间漏磁、磁极边缘效应以及磁路饱和对气隙磁密的影响基础上,建立平行充磁弓形磁极三次谐波削极修正解析模型。然后通过有限元,对比不同磁极电机的电磁性能。结果显示,修正谐波削极电机的平均转矩较简化正弦削极、修正正弦削极电机和简化谐波削极电机均有一定程度的提高,同时转矩脉动低于简化正弦削极和简化三次谐波削极电机,证明修正模型的优越性。最后通过实验验证修正模型的准确性。

In order to achieve the dual design goals of high power density and low torque ripple, this paper took the influence of the relative permeability of the permanent magnet, stator slotting, pole to pole leakage, pole edge effect and magnetic circuit saturation on the air-gap flux density into consideration. The analytical model of third harmonic pole clipping correction under the condition of parallel magnetization was established, then the finite-element model was established, and the electromagnetic properties of different poles were compared. The results showed that the average torque of the modified third harmonic motor was improved partly compared with that of the simplified sine pole motor, the modified sine pole motor and the simplified third harmonic motor respectively. At the same time, the torque ripple was lower than the simplified sine pole motor and the simplified third harmonic motor, which proved the superiority of the modified model. Finally, the accuracy of the modified model was verified by experiments.