Efficient energy harvesting from irregular mechanical vibrations by active motion control

Hiroshi Okamoto, Teppei Onuki, Sumito Nagasawa, Hiroki Kuwano

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


A vibration-driven micropower generator with a high-Q mechanical resonator efficiently works under single-frequency vibration. However, the associated narrow operation frequency bandwidth tightly limits the power output under commonly observed wideband ambient vibrations. In this paper, we present a power-generation scheme in which the motion of an internal mass element is actively controlled. The control is such that the vibrating environment is forced to do the maximum possible work to the power generator. Electret-based energy conversion was analyzed as a means to realize the scheme, drawing on evidence from an experiment. We further analyzed the active control in general terms to reveal potential performance that is substantially above the conventional designs.

Original languageEnglish
Article number5282595
Pages (from-to)1420-1431
Number of pages12
JournalJournal of Microelectromechanical Systems
Issue number6
Publication statusPublished - 2009 Dec
Externally publishedYes


  • Electrets
  • Energy conversion
  • Micoelectromechanical devices
  • Vibrations

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering


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