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Low-frequency vibration energy harvester using a spherical permanent magnet with controlled mass distribution

Title
Low-frequency vibration energy harvester using a spherical permanent magnet with controlled mass distribution
Authors
Choi, YunheeJu, SunaChae, Song HeeJun, SangbeomJi, Chang-Hyeon
Ewha Authors
전상범지창현
SCOPUS Author ID
전상범scopus; 지창현scopus
Issue Date
2015
Journal Title
SMART MATERIALS AND STRUCTURES
ISSN
0964-1726JCR Link1361-665XJCR Link
Citation
vol. 24, no. 6
Keywords
vibration energy harvesterroly-polyelectromagnetic power generation
Publisher
IOP PUBLISHING LTD
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
This paper presents a vibration energy harvester using a springless spherical permanent magnet with a non-uniform mass distribution as a proof mass. The magnet has been designed to have the center of mass below the geometrical center, which generates a roly-poly-like motion in response to external vibrations and maintains the upright position. Utilizing this roly-poly-like magnet, proof-of-concept electromagnetic energy harvesters have been fabricated, tested and analyzed. An analytical model which explains the motion of the magnet assembly and resulting output voltage has been developed by finite element analysis of the magnetic field distribution and motion analysis of the magnet assembly. With the fabricated device, a maximum open-circuit voltage of 48.85 mV(rms) and an output power of 9.03 mu W have been obtained in response to a 20 Hz sinusoidal vibration at 3 g acceleration.
DOI
10.1088/0964-1726/24/6/065029
Appears in Collections:
엘텍공과대학 > 전자공학과 > Journal papers
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