截顶型线圈无线电能传输系统优化研究

Research on optimization of truncated coil wireless power transfer system

在无线电能传输系统中,互感作为评估收发线圈间耦合程度的指标,其大小直接影响到系统的传输功率。通过探究系统中互感、接收线圈内径和传输距离的关系,提出了截顶型螺旋线圈的优化结构,用于改善系统的传输性能。首先通过对基于LCC补偿方式的电路建模分析,证明了互感对系统输出功率的影响;其次推导了两线圈间的互感表达式;再次探究了互感与系统各参数之间的关系,完成了对截顶型接收线圈的优化设计;最后经过有限元仿真验证,截顶型线圈系统具有更高的互感,较柱形线圈系统提高了10.74%,较圆形线圈系统提高了31.77%,且对于小幅度的轴向偏移,截顶型线圈系统表现出更优的抗偏移能力。

In the wireless power transfer system, mutual inductance is used as an index to evaluate the degree of coupling between the transmitter and receiver coils, and its magnitude directly affects the transmission power of the system. By exploring the relationship between the mutual inductance, inner diameter of the receiver coil and transmission distance in the system, an optimized structure of the truncated spiral coil is proposed to improve the transmission performance of the system. First, through the circuit modeling analysis based on the LCC compensation method, the influence of mutual inductance on the output power of the system is proved. Secondly,the expression of mutual inductance between the two coils is derived. The relationship between the mutual inductance and the parameters of the system is explored, and the optimized design of the truncated receiver coil is completed. Finally, the finite element simulation shows that the truncated coil system has a higher mutual inductance, which is 10.74% higher than the cylindrical coil system, and 31.77% higher than the circular coil system. For small axial deviations, the truncated coil system shows better anti-offset ability.