Conference Proceeding

A vibration energy harvester using magnetostrictive/piezoelectric composite transducer

Key Lab. for Optoelectron. Technol. & Syst., Minist. of Educ. of China, Chongqing Univ., Chongqing, China
11/2009; DOI:10.1109/ICSENS.2009.5398445 pp.1447 - 1450 In proceeding of: Sensors, 2009 IEEE
Source: IEEE Xplore

ABSTRACT An energy harvester is presented to convert ambient mechanical vibration into electrical energy. The harvester consists of a cantilever beam, a magnetic circuit and a magnetostrictive/piezoelectric laminate magnetoelectric (ME) transducer. The magnetic circuit is arranged on the free end of the beam and produces a concentrated flux gradient. When the harvester is excited, the magnetic circuit moves relative to the ME transducer. The ME transducer undergoes magnetic field variations and produces a power output. The nonlinear vibration performances of the harvester are studied using the Lindstedt-Poincare method, and the electrical-output performances of the harvester at resonance are analyzed. A prototype has been fabricated and tested. The experimental results are in agreement with the analytical results. The prototype produces a power of 2.11 mW for an acceleration of 1 g at frequency of 51 Hz.

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Keywords

acceleration
 
ambient mechanical vibration
 
cantilever beam
 
concentrated flux gradient
 
electrical-output performances
 
energy harvester
 
free end
 
harvester
 
Lindstedt-Poincare method
 
magnetic circuit
 
magnetic circuit moves
 
magnetostrictive/piezoelectric laminate magnetoelectric
 
power output
 

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