Permanent magnet machine adopting Halbach array has more sinusoidal air-gap flux density distribution and higher air-gap flux density magnitude. Compared with the equal segmented Halbach array, the fundamental magnitude of air gap flux density can be higher and distortion rate can be lower by reasonably designing each segment width in unequal segmented Halbach array. Thus, in this paper, the permanent magnet machine adopting unequal segmented Halbach array is researched. Firstly, an analytical model is established for PM machine adopting Halbach array to improve the calculation efficiency. This analytical model can be applied to the Halbach array having arbitrary pole pair number, arbitrary number of segments per pole, arbitrary segment width and arbitrary gap width between segments. Further, the calculation results for air gap flux density between analytical model and finite element method are compared to verify the analytical model. In addition, the method to determine each segment width in the unequal segmented Halbach array is proposed firstly in this paper. On this basis, effects of the gap width between segments and each segment width under one pole on air gap flux density are researched. The research conclusions will provide guidance for the design and fabrication of unequal segmented Halbach array.

中文翻译：

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不等分段Halbach阵列永磁电机的磁场建模与分析

采用Halbach阵列的永磁电机具有更多的正弦气隙磁通密度分布和更高的气隙磁通密度大小。与均等分割的Halbach阵列相比，通过合理设计不等均分割的Halbach阵列中的每个片段宽度，气隙通量密度的基本幅度可以更高，畸变率可以更低。因此，本文研究了采用不等分段Halbach阵列的永磁电机。首先，建立了采用哈尔巴赫阵列的永磁电机分析模型，以提高计算效率。该分析模型可以应用于具有任意极对数，每极任意段数，任意段宽度以及段之间的任意间隙宽度的Halbach阵列。进一步，比较了解析模型与有限元方法对气隙通量密度的计算结果，验证了解析模型的正确性。另外，本文首先提出了确定不等分分段Halbach阵列中每个分段宽度的方法。在此基础上，研究了节段之间的间隙宽度和一个极点下每个节段的宽度对气隙通量密度的影响。研究结论将为不均等分段的Halbach阵列的设计和制造提供指导。研究了节段之间的间隙宽度和一个极点下每个节段宽度对气隙通量密度的影响。研究结论将为不均等分段的Halbach阵列的设计和制造提供指导。研究了节段之间的间隙宽度和一个极点下每个节段宽度对气隙通量密度的影响。研究结论将为不均等分段的Halbach阵列的设计和制造提供指导。