Li Wenwei, Jiang Pingping, Wang Zhiwu, Yan Guozheng
School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Micromachines (Basel). 2024 Dec 19;15(12):1510. doi: 10.3390/mi15121510.
The rapid development of wireless power transfer (WPT) technology has provided new avenues for supplying continuous and stable power to capsule robots. In this article, we propose a two-dimensional omnidirectional wireless power transfer (OWPT) system, which enables power to be transmitted effectively in multiple spatial directions. This system features a three-dimensional transmitting structure with a Helmholtz coil and saddle coil pairs, combined with a one-dimensional receiving structure. This design provides sufficient internal space, accommodating patients of various body types. Based on the magnetic field calculation and finite element analysis, the saddle coil structure is optimized to enhance magnetic field uniformity; to achieve a two-dimensional rotating magnetic field, a phase difference control method for the excitation signal is developed through the analysis of circuit topology and quantitative synthesis of non-equivalent magnetic field vectors. Finally, an experimental prototype is built, and the experimental results show that the one-dimensional transmitting coil achieves a minimum received voltage stability of 94.5% across different positions. When the three-dimensional transmitting coils operate together, a two-dimensional rotating magnetic field in the plane is achieved at the origin, providing a minimum received power of 550 mW with a voltage fluctuation rate of 7.68%.
无线电力传输（WPT）技术的快速发展为向胶囊机器人提供持续稳定的电力供应开辟了新途径。在本文中，我们提出了一种二维全向无线电力传输（OWPT）系统，该系统能够在多个空间方向上有效地传输电力。该系统具有由亥姆霍兹线圈和鞍形线圈对组成的三维发射结构，并结合一维接收结构。这种设计提供了足够的内部空间，可容纳各种体型的患者。基于磁场计算和有限元分析，对鞍形线圈结构进行了优化以提高磁场均匀性；为实现二维旋转磁场，通过分析电路拓扑结构并对非等效磁场矢量进行定量合成，开发了一种激励信号的相位差控制方法。最后，构建了一个实验原型，实验结果表明，一维发射线圈在不同位置实现了最低94.5%的接收电压稳定性。当三维发射线圈一起工作时，在原点处实现了平面内的二维旋转磁场，提供了最低550 mW的接收功率，电压波动率为7.68%。
