变电站巡检机器人无线充电系统耦合机构优化分析

Optimization Analysis of Coupling Mechanism in Wireless Charging System for Substation Inspection Robot

针对变电站巡检机器人无线充电系统实际需求,提出了多中继无线电能传输方案。基于其耦合机构优化问题,建立系统模型,推导系统效率表达式;结合平面螺旋线圈的内阻与互感公式,得到多中继WPT系统效率关于线圈匝数、线圈半径、线圈位置的关系。同时选取双中继WPT系统为例,分析系统效率关于耦合机构的变化规律,并在变负载条件下得到了一般耦合机构优化方法。最后,搭建实验平台,验证了所提优化方法的正确性和有效性。

Aiming at the actual needs of the wireless charging system for the substation inspection robot,a multi-relay wireless power transfer scheme is proposed.Based on the optimization probelem of its coupling mechanism,the system model is established and the system efficiency expression is derived.Combining with the internal resistance and mutual inductance formula of the planar spiral coil,the efficiency of the multi-relay WPT system is obtained with respect to number of coil turns,coil radius and coil position.At the same time,taking the dual-relay WPT system as an example,the variation law of the system efficiency with respect to the coupling mechanism is analyzed,and the general coupling mechanism optimization method is obtained under the condition of variable load.Finally,an experimental platform is built to verify the correctness and effectiveness of the proposed optimization method.