NDLI: Electromagnetic human motion generator with magnetic spring and ferrofluid

Content Provider	IET Digital Library
Author	Wang, Siqi Li, Decai
Abstract	An inertial electromagnetic generator realised with magnetic spring and ferrofluid to scavenge energy from low-frequency human motion is presented. The magnetic spring is formed by magnetic attraction force between the fixed and the moving permanent magnet (PM). The kerosene-based ferrofluid is used on the moving PM and suspends the moving PM due to the fluid-magnetic pressure to reduce the mechanical friction as a fluid lubricant. The resonance frequency of the generator 3.5 Hz is experimentally validated with the sinusoidal excitation. The generator can generate an open-circuit voltage of ∼10 V and 0.26 mW average power at a load resistance of 465 Ω on resonance condition with the acceleration of 0.55778 m/s2, and the corresponding power density of the generator is 40.35 μW/cm2. The generator can be fastened to the belt on the backside of waist to harvest human vibration for walking and low running, and the power lever of the generator can reach 1.4–3.4 mW, which is a considerable power for low-power electronic devices.
Starting Page	1693
Ending Page	1695
Page Count	3
ISSN	00135194
Volume Number	51
e-ISSN	1350911X
Issue Number	Issue 21, Oct (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/51/21
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2015.2696
Journal	Electronics Letters
Publisher Date	2015-10-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Electromagnetic Human Motion Generator Energy Harvesting Ferrofluid Fluid Lubricant Fluid-magnetic Pressure Inertial Electromagnetic Generator Kerosene-based Ferrofluid Low-frequency Human Motion Lubricants Magnetic Attraction Force Magnetic Device Magnetic Fluid Magnetic Liquids Magnetic Material Magnetic Material Application And Device Magnetic Spring Mechanical Friction Reduction Moving Permanent Magnet Open Circuit Voltage Resonance Condition Resonance Frequency
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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