Electromagnetic vibration energy harvester using springless proof mass and ferrofluid as a lubricant

S. H. Chae, S. Ju, Y. Choi, S. Jun, S. M. Park, S. Lee, H. W. Lee, C. H. Ji

Research output: Contribution to journalConference articlepeer-review

15 Scopus citations


This paper presents an electromagnetic energy harvester using an array of rectangular permanent magnets as springless proof mass and ferrofluid as a lubricating material. Lateral motion of the multi-pole magnet array generates voltage across an array of copper windings formed under the aluminum channel in response to low frequency external vibrations such as human-body-induced motion. A proof-of-concept device has been fabricated and output voltage has been measured at various input frequencies and accelerations provided by a vibration exciter. Device with ferrofluid lubrication generated maximum open-circuit voltage of 0.47V at 3g vibration at 12Hz, which is 8% higher than that of the device without lubricant. Maximum output power of 71.26μW has been obtained at 40.8Ω with the device with ferrofluid lubrication.

Original languageEnglish
Article number012013
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - 2013
Event13th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2013 - London, United Kingdom
Duration: 3 Dec 20136 Dec 2013


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