Wang Zhongxian, Liu Yiping, Wei Yonggeng, Song Yilin
School of Mechanical & Electrical Engineering, Heilongjiang University, Harbin, P.R. China.
J Appl Biomater Funct Mater. 2018 Jan;16(1_suppl):140-149. doi: 10.1177/2280800018757335.
The resonant coil design is taken as the core technology in the magnetic coupling resonant wireless power transmission system, which achieves energy transmission by the coupling of the resonant coil. This paper studies the effect of the resonant coil on energy transmission and the efficiency of the system. Combining a two-coil with a three-coil system, the optimum design method for the resonant coil is given to propose a novel coil structure.
First, the co-simulation methods of Pspice and Maxwell are used. When the coupling coefficient of the resonant coil is different, the relationship between system transmission efficiency, output power, and frequency is analyzed. When the self-inductance of the resonant coil is different, the relationship between the performance and frequency of the system transmission is analyzed. Then, two-coil and three-coil structure models are built, and the parameters of the magnetic field of the coils are calculated and analyzed using the finite element method. In the end, a dual E-type simulation circuit model is used to optimize the design of the novel resonance coil.
The co-simulation results show that the coupling coefficients of the two-coil, three-coil, and novel coil systems are 0.017, 0.17 and 0.0126, respectively. The power loss of the novel coil is 16.4 mW.
There is an obvious improvement in the three-coil system, which shows that the magnetic leakage of the field and the energy coupling are relatively small. The new structure coil has better performance, and the load loss is lower; it can improve the system output power and transmission efficiency.
谐振线圈设计是磁耦合谐振无线电能传输系统的核心技术，通过谐振线圈的耦合实现能量传输。本文研究了谐振线圈对能量传输及系统效率的影响。结合双线圈和三线圈系统，给出了谐振线圈的优化设计方法，提出了一种新型线圈结构。
首先，采用Pspice和Maxwell联合仿真方法。当谐振线圈的耦合系数不同时，分析系统传输效率、输出功率与频率之间的关系。当谐振线圈的自感不同时，分析系统传输性能与频率之间的关系。然后，建立双线圈和三线圈结构模型，利用有限元法计算并分析线圈磁场参数。最后，采用双E型仿真电路模型对新型谐振线圈进行优化设计。
联合仿真结果表明，双线圈、三线圈和新型线圈系统的耦合系数分别为0.017、0.17和0.0126。新型线圈的功率损耗为16.4 mW。
三线圈系统有明显改进，表明磁场漏磁和能量耦合相对较小。新型结构线圈性能更好，负载损耗更低；可提高系统输出功率和传输效率。
