无线电能传输平板型磁耦合机构电感解析建模方法

Analytical Modeling Method for Inductance of Planar Magnetic Coupler in Wireless Power Transfer

在无线电能传输系统中,磁耦合机构的设计优化对整个系统的性能至关重要。当前这一过程优化往往依赖于有限元仿真和经验优化,其仿真计算速度较慢,严重限制了优化效率。而现有的电感解析计算公式无法求解含有限大磁体的磁耦合机构电感。针对工程中大量采用的含有磁芯的磁耦合机构电感难以快速计算的问题,该文提出一种典型平板式磁耦合机构电感解析建模方法。该方法基于磁路分析、磁阻建模、参数定标与修正等,实现了磁耦合机构由几何参数到电感参数的快速映射。与有限元仿真相比,提出的解析模型提升了求解磁耦合机构电感的计算速度及磁耦合机构的优化效率。通过有限元仿真及实验,验证了该解析建模方法的精度和速度。

The design optimization of the magnetic coupler is critical to the performance of the wireless power transfer systems. At present, this process optimization often relies on finite element simulation and empirical optimization, and its simulation calculation speed is slow, which seriously limits the optimization efficiency. However, the existing inductance analytical calculation formula cannot solve the inductance of the magnetic coupler with finite magnets. Aiming at the difficulty in calculating the inductance of magnetic coupler with ferrite cores widely used in engineering, this paper proposes an analytical modeling method for the inductance of the typical flat-plate magnetic coupler. The method is based on magnetic circuit analysis, magnetoresistance modeling,parameter calibration and correction, etc., and it realizes the rapid mapping of magnetic coupler from geometric parameters to inductance parameters. Compared with the finite element simulation, the analytical model proposed in this paper greatly improves the calculation speed of solving the magnetic coupler inductance, and significantly improves the optimization efficiency of the magnetic coupler. The accuracy and speed of the analytical modeling method are verified by finite element simulation and experiments.