Experimentally validated model and power optimization of a magnetoelectric wireless power transfer system in free-free configuration
Experimentally validated model and power optimization of a magnetoelectric wireless power transfer system in free-free configuration
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DOI：
10.1088/1361-665x/ab90a2
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发表时间：
2020-07
影响因子：
4.1
通讯作者：
B. Truong;S. Roundy
中科院分区：
文献类型：
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作者：
B. Truong;S. Roundy
本文提出了一种利用磁电效应的无线电能传输系统的深入分析和等效电路模型。基于双端口理论，导出了ME系数αME（由产生的电场对外加磁场的导数定义）和传递给负载电阻的功率的显式解析解，并通过实验进行了严格验证。给出了最优负载及其相应的最大输出功率的紧凑的封闭形式。在我们的特定实验系统中，使用由两个Galfenol和一个PZT层制成的层压复合材料，在318.9 µT的外加磁通密度下获得了10mW的功率。虽然αME在文献中广泛用作评估ME传感器性能的标准标准，但我们发现，较大的αME并不总是确保向负载输送更高的最佳功率。相反，我们量化每个磁致伸缩和压电相位的最大可获得的功率的本质影响。我们发现，磁和机械域之间的转换因子往往是更关键的功率优化比机电转换因子，因为它确定和限制可用于传输到电阻负载的最大功率。
This article presents a thorough analysis and an equivalent circuit model of a wireless power transfer system utilizing magnetoelectric (ME) effects. Based on two-port theory, explicit analytical solutions of, (i) the ME coefficient αME (defined by the derivative of the generated electric field with respect to the applied magnetic field), and (ii) the power transferred to a load resistance, are derived and rigorously validated by experiments. The compact closed-forms of the optimal load and its corresponding maximum output power are developed. In our particular experimental system, a power of ∼10 mW is attained at an applied magnetic flux density of 318.9 µT with a laminated composite made by two Galfenol and one PZT layers. While αME is widely used in the literature as a standard criterion to evaluate the performance of a ME transducer, we reveal that larger αME does not always ensure higher optimum power delivered to the load. Instead, we quantify the essential influences of each magnetostrictive and piezoelectric phases on the maximum obtainable power. We show that the transduction factor between the magnetic and mechanical domains is often more critical for power optimization than the mechanical-electrical transduction factor as it determines and limits the maximum power available for transfer to a resistive load.