Hip-mounted electromagnetic generator to harvest energy from human motion

doi:10.1007/s11708-014-0301-2

Front. Energy

2014, Vol. 8

Issue (2) : 173-181 https://doi.org/10.1007/s11708-014-0301-2

RESEARCH ARTICLE

Hip-mounted electromagnetic generator to harvest energy from human motion

Dan DAI¹,Jing LIU^1,^2,^*(

)

1. Key Lab of Cryogenics and Beijing Key Laboratory of CryoBiomedical Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2. Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China

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Abstract

A type of electromagnetic hip-mounted generator (EHG) is proposed to harvest energy from human hip motion to generate electricity. Based on the law of electromagnetic induction, the EHG generator can convert the kinetic power of the thigh swing into electrical energy during walking or running. To demonstrate the feasibility of the present method, a prototype of the EHG has been designed and fabricated. A theoretical analysis has been conducted to interpret the working behavior of this prototype. In addition, the performance of the system has been experimentally tested through a rotary motor and human body motion. When driven by the rotary motor at a rotation speed of 100 r/min, the open-circuit voltage of this prototype is 2.5 V. Further, a maximum open-circuit voltage of approximately 1 V and a maximum output power of 284 μW could be produced respectively when walking with an EHG at a speed of 1.47 m/s. This handy renewable energy technology is promising as a pervasive electricity generation system for a group of wearable or implanted sensors, actuators and mobile electronics.

Keywords human power harvesting pervasive energy electricity generation wearable energy renewable and sustainable energy mobile electronics

Corresponding Author(s): Jing LIU

Issue Date: 19 May 2014

Cite this article:

Dan DAI,Jing LIU. Hip-mounted electromagnetic generator to harvest energy from human motion[J]. Front. Energy, 2014, 8(2): 173-181.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-014-0301-2
https://academic.hep.com.cn/fie/EN/Y2014/V8/I2/173

Fig.1 Installation location and structure of EHG prototype

(a) Installation location of EHG; (b) structure of the generator; (c) detailed structure of the generator

Fig.2 Cross-sectional view of generator prototype

(a) Movement between rotor and stator; (b) installation relationship between rotor and stator

Fig.3 Relationship between rotation frequency of generator and walking frequency

Fig.4 Operating principle of EHG prototype

(a) Swing link at the start; (b) a quarter of a cycle; (c) half of a cycle; (d) at the end

Fig.5 Experimental setup

(a) Mounting of EHG; (b) structure of generator

Fig.6 Circuit diagram of rectifier doubler

Fig.7 Output voltage of EHG when driven by rotary motor at a rotation speed of 20 r/min, 26 r/min, and 33 r/min respectively

Fig.8 Output power of rectifier doubler of EHG when driven by rotary motor at a rotation speed of 20 r/min, 26 r/min, and 33 r/min respectively

Fig.9 Output voltage of EHG prototype at a walking speed of 0.98 m/s, 1.18 m/s, and 1.47 m/s respectively

Tab.1 Maximum output voltage, power and efficiency of generator change with rotation speed of rotary motor

Tab.2 Maximum output voltage, power and efficiency of generator change with walking speed respectively

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