The low coupling coefficient between the transmitter and receiver is the major constraint of a wireless power transfer (WPT) system. Although some approaches, such as increasing the quality factor and achieving precise impedance matching, can reduce the adverse impacts of the low coupling coefficient and improve the system performance, high leakage magnetic flux between the transmitter and receiver remains a problem. With the increase in transfer distance and the misalignment between the transmitter and receiver, the increasing leakage magnetic flux of nondirectional fields degrades the WPT system performance. This paper proposes an active field orientation method to shape the magnetic flux so as to minimize the leakage flux. The amplitude and phase angle of the magnetizing current are controlled, and a coil structure for minimizing the coupling among the transmitters and generating a three-dimensional magnetic field is proposed. This method realizes three-dimension full-range field orientation with adjustable magnitude and direction of B-field at an arbitrary point, and as a result the B-field is concentrated with reduced leakage magnetic flux. The proposed field orientation shaping technique is verified by theoretical analysis, simulation, and experimental results.

中文翻译：

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基于电流幅度和相位角控制的无线电力传输场定向


发射器和接收器之间的低耦合系数是无线功率传输（WPT）系统的主要限制。尽管一些方法，例如提高品质因数和实现精确的阻抗匹配，可以减少低耦合系数的不利影响并提高系统性能，但发射器和接收器之间的高漏磁通量仍然是一个问题。随着传输距离的增加以及发射器和接收器之间的未对准，非方向性场的漏磁通量的增加会降低WPT系统的性能。本文提出了一种主动磁场定向方法来塑造磁通量，从而最大限度地减少漏磁通。控制磁化电流的幅度和相位角，并提出一种用于最小化发射器之间的耦合并产生三维磁场的线圈结构。该方法实现了三维全范围场定向，任意点B场大小和方向可调，B场集中，漏磁通减少。所提出的场定向整形技术通过理论分析、仿真和实验结果得到验证。