基于电磁原理的人体运动能量收集器设计

Design of Human Motion Energy Harvester Based on Electromagnetic Principle

本文聚焦于人体运动所蕴藏的丰富机械能,设计基于电磁感应原理的能量收集器,通过收集人体运动的机械能实现对可穿戴设备的供电。首先分析了人体四个关键位置的运动加速度数据,明确了激励的低频特征及最优化激励方案。针对以上特点,建立能量收集器结构动力学模型并开展参数设计,搭建了两种不同中心磁铁支撑方式的样机。通过单轴振动激励及穿戴运动激励等多种方式验证了能量收集器效果,单轴振动激励下最优输出功率不低于1.92 mW,在脚腕最优化激励条件下可获得3.5 V的有效输出。

The rich mechanical energy contained in human movement is focused on.an energy harvester based on electromagnetic induc-tion principle is designed.and power supply for wearable devices is realized by harvesting the mechanical energy of human movement.Firstly.the motion acceleration data of four key positions of human body are analyzed.and the low-frequency characteristics of excitation and the optimal excitation scheme are defined.In view of the above characteristics.the structural dynamics model of the energy harvester is established and the parameters are designed.and two prototypes with different center magnet support modes are built.The effect of energy harvester is verified by uniaxial vibration excitation and wearable motion excitation.The optimal output power under uniaxial vi-bration excitation is no less than 1.92 mW.and the effective output of 3.5 V can be obtained under optimal ankle excitation.