Human kinetic energy harvesting technology based on magnetic levitation structure

doi:10.3785/j.issn.1008-973X.2019.11.020

Journal of ZheJiang University (Engineering Science)

2019, Vol. 53

Issue (11): 2215-2222 DOI: 10.3785/j.issn.1008-973X.2019.11.020

Energy Engineering

Human kinetic energy harvesting technology based on magnetic levitation structure

Fei FEI1(

),Shen-yu LIU1,Chang-cheng WU1,De-hua YANG1,Sheng-li ZHOU2

1. Institute of Automation, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
2. School of Astronautics, Northwestern Polytechnical University, Xi’an 710072, China

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Abstract

An electromagnetic energy harvesting device based on magnetic levitation structure was designed, and the harvesting device can be installed on wrist, elbow and ankle to harvest human kinetic energy generated during human motions. Several kinds of energy harvesting technologies for vibration energy were summarized. The acceleration and the angular velocity of human joints in motion were measured with inertial sensors. The work principle of nonlinear energy harvesting of magnetic levitation structure was analyzed theoretically. The distribution of magnetic field and the variation of magnetic line of force around the structure during vibration were simulated with finite element tools. The resonant frequencies and the range of output voltage were verified by vibration test platform. When the user wears the device for testing, the output voltage and the power increase with the speed of movement. At the speed of 8 km/h, the maximum instantaneous power values captured by wrist, elbow and ankle were 0.60 mW, 0.30 mW and 0.58 mW, respectively. Experimental results show that the electromagnetic energy harvesting device based on magnetic levitation structure can effectively scavenge human kinetic energy and provide electric power for low power consumption devices such as wearable sensors.

Key words： magnetic levitation human kinetic energy energy harvesting finite element simulation wearable device

Received: 08 September 2018 Published: 21 November 2019

CLC:

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	Fei FEI
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Cite this article:

Fei FEI,Shen-yu LIU,Chang-cheng WU,De-hua YANG,Sheng-li ZHOU. Human kinetic energy harvesting technology based on magnetic levitation structure. Journal of ZheJiang University (Engineering Science), 2019, 53(11): 2215-2222.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.11.020 OR http://www.zjujournals.com/eng/Y2019/V53/I11/2215

基于磁悬浮结构的人体动能采集技术

设计基于磁悬浮结构的电磁能量采集装置，该装置可佩戴于使用者的腕部、肘部和脚踝处，收集人体运动过程中产生的动能. 概述现有的可用于振动能量采集的多种能量采集技术，利用惯性传感器对实验者运动时的关节加速度及角速度进行测量，对磁悬浮结构的非线性能量采集工作原理进行理论分析. 运用有限元工具对振动时结构周边的磁场分布和磁力线变化进行仿真研究，并通过振动实验平台验证装置的共振频率和电压输出范围. 当使用者佩戴该装置进行测试时，装置输出的电压及功率随运动速度的增加而增加，在8 km/h的运动条件下，腕部、肘部和踝部所能俘获的最大瞬时功率分别为0.60、0.30、0.58 mW. 实验结果表明，基于磁悬浮互斥结构的电磁能量采集装置能有效采集人体动能，并为可穿戴传感器等低功耗设备供能.

关键词： 磁悬浮, 人体动能, 能量采集, 有限元仿真, 可穿戴设备

Tab.1 Advantages and disadvantages of three kinds of vibration energy harvesting technologies

Tab.2 Generated and recycled energy of human daily activities

Fig.1 Installation diagram of inertial motion sensors

Fig.2 Acceleration and angular velocity of human body parts with different motion speeds

Fig.3 Swing frequency with different motion speeds

Fig.4 Structure diagram of electromagnetic energy harvester

Tab.3 Parameters of electromagnetic energy harvester

Fig.5 Equivalent model diagram of magnetic levitation structure

Fig.6 Half cross section view of simulation model

Fig.7 Half cross section view of magnetic flux density/magnetic induction line with excitation frequency of 6 Hz

Fig.8 Three-dimensional diagram of magnetic field distribution in initial position

Fig.9 Electromagnetic energy harvester and excitation platform

Tab.4 System parameters of electromagnetic energy harvester

Fig.10 Variation curves of open-circuit peak to peak voltage and acceleration of excitation platform with different frequencies

Fig.11 Variation curves of output power with different load resistance values

Fig.12 Comparison of theoretical, simulation and experimental results of open-circuit voltage with excitation frequency of 6 Hz

Fig.13 Installation of energy harvester

Fig.14 Variation curves of open-circuit peak to peak voltage with different movement speeds

Fig.15 Output voltage waveforms of wrist, elbow and ankle at speed of 8 km/h


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