Computation of the Mutual Inductance between Air-Cored Coils of Wireless Power Transformer

[摘要] Wireless power transfer system is a modern technology which allows the transfer of electric power between the air-cored coils of its transformer via high frequency magnetic fields. However, due to its coil separation distance and misalignment, maximum power transfer is not guaranteed. Based on a more efficient and general model available in the literature, rederived mathematical models for evaluating the mutual inductance between circular coils with and without lateral and angular misalignment are presented. Rather than presenting results numerically, the computed results are graphically implemented using MATLAB codes. The results are compared with the published ones and clarification regarding the errors made are presented. In conclusion, this study shows that power transfer efficiency of the system can be improved if a higher frequency alternating current is supplied to the primary coil, the reactive parts of the coils are compensated with capacitors and ferrite cores are added to the coils.

[发布机构] Dept. of Electrical Engineering, Tshwane University of Technology, Pretoria, South Africa^1;LISV Laboratory, Université de Versailles Saint-Quentin-en-Yvelines, Versailles, France^2;GEMaC Laboratory, Université de Versailles Saint-Quentin-en-Yvelines, Versailles, France^3

[效力级别] 数学

[关键词] Alternating current;Angular misalignment;High-frequency magnetic field;Maximum power transfer;Modern technologies;Power transfer efficiency;Separation distances;Wireless power transfer