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

Yunhee Choi, Suna Ju, Song Hee Chae, Sangbeom Jun, Chang Hyeon Ji

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

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 mVrms and an output power of 9.03 μW have been obtained in response to a 20 Hz sinusoidal vibration at 3 g acceleration.

Original languageEnglish
Article number065029
JournalSmart Materials and Structures
Volume24
Issue number6
DOIs
StatePublished - 1 Jun 2015

Keywords

  • electromagnetic power generation
  • roly-poly
  • vibration energy harvester

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