面向微型机器人的无线供电系统变空间尺度问题综述

Review on Variable Spatial Scales Issues of Wireless Power Transfer System for Micro-robots

超磁致执行器(GMA)具有结构简单、位移大以及输出力强、机械强度高等优点,可作为微型机器人的动力装置,其核心元件超磁致伸缩材料可通过电磁场驱动,从而实现微型机器人远程无线供电。在实际应用中,随着微型机器人运动轨迹的变化,GMA与供电系统发射线圈的空间位置关系即空间尺度也实时变化,进而影响无线供电系统的传输特性,包括传输功率和传输效率。基于此,重点论述了无线供电系统在变空间尺度情况下的工作机理及现有问题的解决方案,为实现微型机器人高效稳定供电提供参考和借鉴。

Giant magnetostrictive actuator （GMA） has the advantages of simple structure, large displacement, high output torque and mechanical strength, etc.,which can be used as the power device for mirco-robots.As the key component of GMA,the giant magnetostrictive material can be driven by the electromagnetic field,thus the long-distance wire-less power for micro-robots can be realized.In practical applications, the spatial position of GMA and sending coil of wireless power transfer（WPT） system, i.e., the spatial scales varies with the movement variation of micro-robots, which has a vital influence on the transfer characteristics of WPT system,including the transfer power and transfer effficiency.The operation principle of WPT system under various spatial scales is analyzed, focusing on the mutual inductance between sending coil and receiving coil, along with the present solutions to tackle the variable spatial scales issues, which will provide an important reference to realize the high efficiency and stability power supply for micro-robots.