Coil Positioning for Wireless Power Transfer System of Automatic Guided Vehicle Based on Magnetic Sensing.
Coil Positioning for Wireless Power Transfer System of Automatic Guided Vehicle Based on Magnetic Sensing.
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DOI：
10.3390/s20185304
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发表时间：
2020-09-16
期刊：
影响因子：
--
通讯作者：
Song K
中科院分区：
文献类型：
--
作者：
Liang C;Zhang Y;Li Z;Yuan F;Yang G;Song K
作为无线电能传输(WPT)系统的辅助功能，线圈定位可以解决由于磁力耦合器不对准而导致的电能传输过程中功率和效率的下降。本文采用霍尔传感器阵列来测量磁通密度的变化。通过将多传感器数据融合结果与线圈对准得到的预设数据进行比较，可以实现接收线圈的实时准确定位。首先，建立了接收线圈的定位模型，分析了磁感应强度随线圈偏心的变化规律。其次，提出了平面八向对称传感器阵列的布置和基于磁通密度变化数据融合的定位算法。为了避免自动导引车(AGV)对准过程中磁场分布不稳定而引起的线圈位置不对中，实际受到互感变化的影响，提出了一次侧和二次侧恒流控制策略。最后搭建了线圈定位实验平台。实验结果表明，本文提出的线圈定位方法具有较高的精度，定位误差在4 cm以内。
As an auxiliary function of the wireless power transfer (WPT) system, coil positioning can solve the power and efficiency degradation during power transmission caused by misalignment of the magnetic coupler. In this paper, a Hall sensor array is used to measure the change of magnetic flux density. By comparing the multisensor data fusion results with the preset data obtained from the coil alignment, the real-time accurate positioning of the receiving coil can be realized. Firstly, the positioning model of the receiving coil is built and the variation of magnetic flux density with the coil misalignment is analyzed. Secondly, the arrangement of the Planar 8-direction symmetric sensor array and the positioning algorithm based on data fusion of magnetic flux density variations are proposed. In order to avoid coil positioning misalignment caused by the unstable magnetic field distribution which is actually affected by the change of mutual inductance during automatic guided vehicle (AGV) alignment, the constant current strategy of primary and secondary sides is proposed. Finally, the coil positioning experimental platform is built. The experimental results show that the coil positioning method proposed in this paper has high accuracy, and the positioning error is within 4 cm.
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