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.

中文翻译：

---

自由配置下磁电无线电力传输系统的实验验证模型和功率优化

本文介绍了利用磁电 (ME) 效应的无线电力传输系统的全面分析和等效电路模型。基于双端口理论，(i) ME 系数 αME（由产生的电场相对于施加的磁场的导数定义）和 (ii) 传输到负载电阻的功率的显式解析解，由实验推导出并严格验证。开发了最佳负载及其相应最大输出功率的紧凑闭合形式。在我们特定的实验系统中，使用由两层 Galfenol 和一层 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约 10 mW 的功率。虽然 αME 在文献中被广泛用作评估 ME 换能器性能的标准标准，我们发现较大的 αME 并不总能确保提供给负载的最佳功率更高。相反，我们量化了每个磁致伸缩和压电相位对最大可获得功率的基本影响。我们表明，磁域和机械域之间的转换因子对于功率优化通常比机械-电气转换因子更重要，因为它决定并限制了可用于传输到电阻负载的最大功率。