Multimodal energy harvesting system: Piezoelectric and electromagnetic

Yonas Tadesse, Shujun Zhang, Shashank Priya

Research output: Contribution to journalArticlepeer-review

212 Scopus citations


In this study, we report a multimodal energy harvesting device that combines electromagnetic and piezoelectric energy harvesting mechanism. The device consists of piezoelectric crystals bonded to a cantilever beam. The tip of the cantilever beam has an attached permanent magnet which, oscillates within a stationary coil fixed to the top of the package. The permanent magnet serves two purpose (i) acts as a tip mass for the cantilever beam and lowers the resonance frequency, and (ii) acts as a core which oscillates between the inductive coils resulting in electric current generation through Faraday's effect. Thus, this design combines the energy harvesting from two different mechanisms, piezoelectric and electromagnetic, on the same platform. The prototype system was optimized using the finite element software, ANSYS, to find the resonance frequency and stress distribution. The power generated from the fabricated prototype was found to be 0.25 W using the electromagnetic mechanism and 0.25 mW using the piezoelectric mechanism at 35 g acceleration and 20 Hz frequency.

Original languageEnglish (US)
Pages (from-to)625-632
Number of pages8
JournalJournal of Intelligent Material Systems and Structures
Issue number5
StatePublished - Mar 2009

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanical Engineering


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