一种可产生均匀磁场的并联发射线圈结构

Parallel Transmitting Coil Structure Capable of Producing Uniform Magnetic Field

提出了一种新型发射线圈设计方案。发射线圈以中心点为基准均匀排布,内部所有单圈线圈并联,在线圈中加入特定比例的电容,使得每圈上流过的电流成一定比例,最终使得这些电流产生的叠加磁场的法向分量分布均匀。该设计方案可产生均匀磁场,使接收线圈在磁场分布区域内有较高的自由度,同时能稳定接收端的接收功率和效率。实验中,通过比较接收线圈在发射线圈正上方5mm垂直高度处的感应峰峰值波动性来评价磁场均匀性,结果发现,新型方案测试数据的标准差为9.76,传统方案测试数据的标准差为43.31。仿真结果与实验结果吻合,均表明,相比于传统发射线圈,新型发射线圈有效改善了磁场的均匀性。

A new type of transmitting coil is proposed,in which the turns of the coil are connected in parallel,and the current of each turn is determined by the added capacitance connected with each turn in series.The transmitting coil provides an uniform magnetic field.The receiving coil has a wider region where the receiving coil has the stable received power and efficiency.In the experiments,the uniformity of the magnetic field is evaluated by comparing the peak value of induced voltage of the receiving coil which is located at 5 mm height above the transmitting coil.The experimental results show that the standard deviation of the new design is 9.76,and the standard deviation of the traditional one is 43.31.The simulation results are in good agreement with the experimental results.It is shown that the new transmitting coil design can improve the uniformity of the magnetic field which is better than the traditional transmitting coil design.