金属环境对谐振式无线电能传输系统的影响分析

Effect Analysis of Metal Environment on Magnetic Resonant Wireless Power Transmission System

根据磁搞合谐振式无线电能传输原理,建立两线圈的磁耦合谐振式电路模型,通过金属材料相对磁导率的引入,分析了不同金属环境对无线电能传输系统的自感、互感、传输效率的影响。采用Maxwell磁场计算软件计算无金属环境及不同金属环境下收发线圈参数,再利用Maxwell和Simplorer联合仿真分析电磁屏蔽效果;利用联合仿真探究了金属环境对系统传输特性的扰动并实验验证。铁磁性屏蔽板铁、镍的存在有效约束了空间磁场分布,具有很好的电磁屏蔽作用,减少电磁干扰;同时使得无线电能传输系统的收发线圈电感增大,而金属铜、铝环境中对无线电能传输系统几乎无影响,与无金属环境结果相同。最后通过实验验证实验结果与理论分析的一致性。

According to the principle of magnetic coupling resonance wireless power transmission, a magnetic coupling resonance circuit model of two coils is established. The influence of different metal environments on the self-inductance, mutual inductance and transmission efficiency of the wireless power transmission system is analyzed by introducing the relative permeability of the metal materials. Maxwell magnetic field calculation software is used to calculate the parameters of the transceiver coies in the metal-free environment and different metal environments, and then Maxwell and Simplorer co-simulation is used to analyze electromagnetic shielding effect. The interference of the metal environment on the transmission characteristics of the system is explored by co-simulation. The presence of iron and nickel in the ferromagnetic shield effectively restrains the distribution of the magnetic field, which has a good electromagnetic shielding effect and can reduce the electromagnetic interference. At the same time, the inductance of the transmitting and receiving coils of the wireless power transmission system is increased, while copper and aluminum have little effect on the wireless power transmission system, and the result is the same as that of the metal-free environment. Finally, the experimental results verify the consistency of the theoretical analysis.