Design and performance test of a high volumetric Figure of Merit&nbsp; electromagnetic vibration energy harvester

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (10) : 102-109.

Design and performance test of a high volumetric Figure of Merit electromagnetic vibration energy harvester

REN Long1，CHEN Renwen1，Stephen Burrow2，XIA Huakang1，ZHANG Xiaoxiao1

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Abstract

Smallscale vibration energy harvesters that can work at low frequencies efficiently are challenging to realize. To increase their energy harvesting efficiency, a type of high volumetric Figure of Merit magnetoelectric vibration energy harvester was proposed. To increase the magnetic linkage gradient of its coil in moving direction and in its motion region, a lumped parameters equivalent magnetic circuit model was adopted in its magnetic structural parameters optimization. A finite element analysis was then used to verify the analytical model and theoretical results. Finally, 3 prototypes with different parametric combinations were manufactured and fabricated for experiments. The experimental results indicate that the average output power over its matched load resistance can reach 0.748 mW under the excitation of 22.5 Hz and 100 mg. The corresponding volumetric Figure of Merit can reach 1.11%, which is higher than those of the other two prototypes (volumetric Figure of Merit of 0.31% and 0.77% in their own resonances). The research shows that, by the rational optimization of its magnetic circuit of the magnetoelectric transducer, the energy harvester can increase its volumetric Figure of Merit efficiently. It can be a realizing miniaturization method for low frequency vibration energy harvesters.

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vibration energy harvester / magnetoelectric / volumetric Figure of Merit / equivalent magnetic circuit model / finite element analysis

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REN Long1，CHEN Renwen1，Stephen Burrow2，XIA Huakang1，ZHANG Xiaoxiao1. Design and performance test of a high volumetric Figure of Merit electromagnetic vibration energy harvester[J]. Journal of Vibration and Shock, 2018, 37(10): 102-109

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