Open AccessVibration energy harvester based on magnetoelectric transducer
Author(s) -
Xianzhi Dai,
Wen Yao,
Ping Li,
Jianxiao Yang,
Jiang Xiao-Fang
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.2137
Subject(s) - vibration , acoustics , transducer , magnetostriction , cantilever , magnetic field , materials science , magnetic circuit , magnet , piezoelectricity , air gap (plumbing) , beam (structure) , physics , optics , composite material , quantum mechanics
An energy harvester is presented to scavenge energy from ambient vibrations using magnetostrictive/piezoelectric laminated magnetoelectric ME transducer. A cantilever beam is employed as the vibration sensitive element of the harvesterand a magnetic circuit made up of four NdFeB magnets is placed on the free end of the beam. Since the magnetic circuit produces a concentrated flux gradient in the air gapthe ME transducer can induce large magnetic field variations in the low level vibrationthus high output power can be obtained. Based on the equivalent magnetic charge theorythe magnetic field distribution of the air gap and the magnetic force of the magnetic circuit are analyzedand the nonlinear vibration performance of the harvester is studied using the Lindstedt-Poincaré method. The mechano-magneto-electric performance of the harvester at resonance is analyzed by combining the vibration equation of the harvester with the magnetoelectric characteristics of the ME transducer. The experimental results verified the analytical resultsand a prototype produces a power of 1124 μW for an acceleration of 05g at its resonant frequency of 33 Hz.