中文摘要：

为提高煤矿井下无线电能传输系统的传输功率和效率，并降低各回路电容电压，改进了井下无线电能传输系统线圈的结构，提出了适合井下无线电能传输的传输系统。根据电路互感耦合理论，推导出无线电能传输系统的传输功率和效率的数学理论表达式，分别阐述了耦合系数和负载大小对传输功率与传输效率的影响。应用OrCAD与Matlab软件对传输系统各种影响因素进行仿真分析，在此基础上设计并制作了实验平台。实验得出此系统存在最佳效率传输距离，总体实验结果与理论仿真结果一致，最后通过与典型三线圈磁耦合谐振无线电能传输系统做对比实验分析，得出在井下相同传输距离时，改进三线圈磁耦合谐振无线电能传输系统在提高传输效率的同时也提高了传输功率，可为实际井下无线电能传输系统提供理论参考。

英文摘要：

In order to enhance coal mine transmission power and transmission efficiency of the wireless power transmission system and reduce the voltage of loop capacitor, the coil structure of the wireless power transmis- sion system is improved and the transmission system for the wireless power transmission system is proposed. According to the theory of mutual inductance coupling circuit, the mathematical expressions of wireless power transmission system transmission power and transmission efficiency is deduced. The impacts of coefficient of coupling and load on the transmission power and transmission efficiency are elaborated separately. In the design process,the OrCAD and MATLAB are used to simulate and analyze the various influential factors of the trans- mission system. Based on the above, an experimental platform is designed and fabricated. The optimum efficien- cy transmission distance of the wireless power transmission system are existed by the result of experimental a-nalysis. The experimental results are consistent with the simulation results totally. Compared those experiments with magnetically coupled resonant wireless power transmission system with typical three coils, the transmission efficiency and transmission power of the improved wireless power transmission system are increased which can provide theoretical reference for the field practice of the wireless power transmission system in the coal mine.