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Leakage Flux Adjustment and Flux Field Optimization for Coreless Axial Flux Permanent Magnet Synchronous Machine Based on U-shaped Iron

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Abstract

The rotor leakage flux will cause a lot of eddy current losses in the windings of coreless axial flux permanent magnet synchronous machine (CAFPMSM). This article presents a rotor leakage flux adjustment method for the CAFPMSM based on U-shaped iron, which can also achieve the optimization of the rotor flux field. The U-shaped iron can reduce the leakage flux crosses the winding and improve the spatial harmonic distribution of the air gap field at the same time. Firstly, the basic topology and its operating principle are investigated by using an equivalent magnetic circuit model. And then, the characteristics of the flux field distribution in the winding area are analyzed, and the parameters of the U-shaped iron on the leakage flux path regulation are elaborated and optimized by the three-dimensional finite-element method (3D FEM) analysis. Finally, the comprehensive experimental results show that the leakage flux path of the rotor passes through the U-shaped magnetically conductive block rather than through the windings, the total harmonic distortion (THD) of the air gap flux density waveform can be significantly decreased, and the THD of the back EMF and the eddy current losses are lower than before.

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Acknowledgements

This work was supported in part by the Excellent Youth Fund of Shandong Natural Science Foundation under Grant ZR2020YQ40, in part by the National Natural Science Foundation of China under Grant 51877093, in part by the National Key Research and Development Program of China under Grant 2018YFE0100200, and in part by the Key Technical Innovation Program of Hubei Province under Grant 2019AAA026, and in part by the Key project of Scientific Research Plan of Hubei Education Department under Grant D20201407, and in part by the Xiangyang Industrial Institute of Hubei University of Technology.

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Authors and Affiliations

  1. Department of Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment, Hubei University of Technology, Wuhan, China

    Xiaoguang Wang, Hao Yin, Cheng Liu, Xiaofeng Li & Guoguang Zhang

  2. School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, China

    Yi Liu & Wei Xu

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  1. Xiaoguang Wang
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  2. Hao Yin
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  3. Cheng Liu
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  4. Xiaofeng Li
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  5. Guoguang Zhang
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  6. Yi Liu
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  7. Wei Xu
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Correspondence to Yi Liu.

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Wang, X., Yin, H., Liu, C. et al. Leakage Flux Adjustment and Flux Field Optimization for Coreless Axial Flux Permanent Magnet Synchronous Machine Based on U-shaped Iron. J. Electr. Eng. Technol. 18, 3581–3592 (2023). https://doi.org/10.1007/s42835-023-01480-5

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  • DOI: https://doi.org/10.1007/s42835-023-01480-5

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