锥形线圈无线电能传输特性优化

Optimization of wireless power transfer characteristics of conical coil

锥形线圈具有平面螺旋线圈与柱形螺旋线圈的综合特性,可用于无线电能传输系统中的磁耦合机构。本文首先基于电路理论建立模型,推导出磁耦合机构参数与系统输出参数的关系;然后利用Maxwell软件,从磁感应强度与互感的角度分析与比较传统平面螺旋线圈与圆柱螺旋线圈,提出匝间距不同的两种锥形线圈,两种线圈分别使用铁氧体板及铁氧体条;最后搭建无线电能传输系统实验样机。实验与仿真结果表明,与柱形螺旋线圈相比,锥形线圈结构作为发射线圈时,接收线圈在偏移距离为0~75 mm内可获得最高达85.5%的电能传输效率,最高提升4.9%;偏移距离为0~50 mm内输出功率也较高,最高达264 W,提升15.3%。

Conical coil has the comprehensive characteristics of planar spiral coil and cylindrical spiral coil and can be used in magnetic coupling mechanism of wireless power transmission system. In this paper, a model is established based on circuit theory, and the relationship between the magnetic coupling mechanism parameters and system output parameters is deduced. Then, Maxwell software was used to analyze and compare the traditional planar spiral coil and cylindrical spiral coil from the perspective of magnetic induction intensity and mutual inductance, and two kinds of conical coils with different turns spacing were proposed. Ferrite plate and ferrite strip were used for the two kinds of coils respectively. Finally, an experimental prototype of the wireless power transmission system is built. Experimental and simulation results show that compared with the cylindrical spiral coil, when the conical coil is used as the transmitting coil, the power transmission efficiency of the receiving coil is up to 85.5% when the offset distance is 0~75 mm, and the power transmission efficiency is up to 4.9%. When the offset distance is 0~50 mm, the output power is also high, up to 264 W, which increases by 15.3%.