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无线充电系统耦合器自感与互感的非线性研究
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Study on Nonlinearity of Self-inductance and Mutual Inductance for Couplers of Wireless Charging Systems
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    当前在电动汽车无线充电系统的耦合器中,铁氧体板被广泛使用. 本文借助数值计算方法深入研究带有铁氧体板的耦合器的自感与互感的非线性,并考虑铁氧体板的厚度、线圈与铁氧体板的间距、铁氧体板的尺寸以及传输距离等4个关键参数对非线性的影响. 研究发现:自感与互感的非线性受铁氧体板厚度的影响最大,受线圈与铁氧体板的间距以及铁氧体板的尺寸的影响较小,而受传输距离的影响很小. 此外,自感与互感非线性对应的饱和电流与铁氧体板的厚度和线圈与铁氧体板的间距正相关,与铁氧体板的尺寸成负相关,而互感的饱和电流随传输距离的增大而小幅增大. 继而给出了对应最小饱和电流的4种参数组合,并得到了最小饱和电流为160 A,即当线圈电流小于160 A时,耦合器的自感与互感为线性,耦合器可看作线性设备. 最后,利用实验验证了仿真结果的正确性,并利用耦合器在电流不大时的线性特性对耦合器周围的磁场进行了分析.

    Abstract:

    Currently, the ferrite plates are widely utilized in couplers of wireless power transfer systems in electric vehicles. In this paper, the nonlinearity of the self-inductance and mutual inductance for the couplers with ferrite plates is intensively studied by numerical calculation method,and four key parameters including the thickness of the ferrite plates,the spacing between the coils and the ferrite plates, the size of ferrite plates and transfer distance are considered. It is found that the nonlinearity of self-inductance and mutual inductance is greatly affected by the thickness of the ferrite plates,followed by the spacing between the coils and the ferrite plates and the size of the ferrite plates,and little affected by the transfer distance. In addition, the saturation current corresponding to the nonlinearity of the self-inductance and mutual inductance is positively correlated with the thickness of the ferrite plates and the spacing between the coils and the ferrite plates,and negatively correlated with the size of the ferrite plates. The saturation current corresponding to the nonlinearity of the mutual inductance increases slightly with the increase of transfer distance. Then, the combination of the four parameters corresponding to the minimum saturation current is provided, and the minimum saturation current is 160 A. That is, when the coil current is less than 160 A,the self- inductance and mutual inductance of the coupler are linear, and the coupler can be treated as a linear device. Finally,the correctness of the simulation is verified by experiment. The linear characteristics of the coupler are used to analyze the magnetic field around the coupler when the current is not large.

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李万路?覮,汪泉弟,李景红,王赢聪.无线充电系统耦合器自感与互感的非线性研究[J].湖南大学学报:自然科学版,2020,47(10):76~85

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  • 在线发布日期: 2020-10-26
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