An E-shape broadband piezoelectric energy harvester induced by magnets

Qingqing Lu, Fabrizio Scarpa, Liwu Liu, Jinsong Leng, Yanju Liu*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)
436 Downloads (Pure)


We describe in this work a broadband magnetic E-shape Piezoelectric Energy
Harvester (PEH) with wide frequency bandwidth. We develop first a nonlinear
electromechanical model of the harvester based on the Hamilton variation principle that simulates the effect of the nonlinear magnetic restoring force at different spacing distances. The model is used to identify the distances existing between two different magnets that enable the system to perform with a specific nonlinearity. The performance of the E-shape PEH is also investigated thorough experiments, with E-shape energy harvesters at different spacing distances tested under several base accelerations excitations. We observe that the frequency domain output voltage of the system shows a general excellent controllable performance, with a widening of the frequency bandwidth. The half-power bandwidth of the linear energy harvester for a distance of 25mm is 0.8Hz only, which can be expanded to 2.67 Hz for the larger distance of 11mm between magnets. The energy harvester presented in this work shows promising performances for broad spectrum vibration excitations compared to conventional cantilever PEH systems with tip mass.
Original languageEnglish
Pages (from-to)2477-2491
JournalJournal of Intelligent Material Systems and Structures
Issue number11
Early online date3 May 2018
Publication statusE-pub ahead of print - 3 May 2018


  • actuator
  • Energy harvesting
  • piezoelectric


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