Analytical Prediction of Torque Ripple in Surface-Mounted Permanent Magnet Motors Due to Manufacturing Variations
Analytical Prediction of Torque Ripple in Surface-Mounted Permanent Magnet Motors Due to Manufacturing Variations
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DOI：
10.1109/tec.2016.2598649
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发表时间：
2016-08
影响因子：
4.9
通讯作者：
Alejandro J. Piña Ortega;Longya Xu
中科院分区：
文献类型：
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作者：
Alejandro J. Piña Ortega;Longya Xu
在表面贴装永磁电机的生产中，制造公差也会影响转矩脉动。在扭矩谱中产生了低电阶的附加谐波。轻微的制造变化在转子以及定子中发展不对称条件。有限元模型可以用来分析由于这些不对称而产生的脉动力矩的大小。然而，由于其随机性，缺乏周期性和对称性，对于不允许简化几何模型的非均匀几何，用数值方法研究问题是费时的。此外，所有可能的变化的实验验证将是非常具有挑战性的，因为它需要零件尺寸和零件分类，大量的电机构建，并最终测试所有样品。因此，本文提出了一种分析模型来研究这种不平衡对转矩脉动的影响。该模型在预测不对称引起的转矩谐波时，与有限元模型和实验结果一致。
In the production of surface-mounted permanent magnet machines, manufacturing tolerances also contribute to torque ripple. Additional harmonics of low electrical orders are created in the torque spectrum. Slight manufacturing variations develop asymmetry conditions in the rotor as well as in the stator. Finite element models can be used to analyze the magnitude of pulsating torque generated due to these asymmetries. However, due to its random nature, lack of periodicity, and symmetry, it is time consuming to study the problem with numerical methods for its uneven geometry that does not allow reduced geometrical models. Moreover, the experimental verification of all possible variations would be very challenging as it would require part dimensioning and part sorting a large quantity of motor builds and finally testing of all samples. Therefore, in this paper an analytical model is presented to study the effect of such imbalance on the torque ripple. The model shows an agreement against finite element models and also with experimental results when predicting torque harmonics that come from asymmetries.