Nonlinear restoring force of spring with stopper for ferroelectric dipole electret-based electrostatic vibration energy harvesters | Zendy

Haruhiko ASANUMA | Zendy; Motoaki Hara | Zendy; Hiroyuki Oguchi | Zendy; Hiroki Kuwano | Zendy

Open Access

Nonlinear restoring force of spring with stopper for ferroelectric dipole electret-based electrostatic vibration energy harvesters

Author(s) -

Haruhiko ASANUMA,

Motoaki Hara,

Hiroyuki Oguchi,

Hiroki Kuwano

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4958884

Subject(s) - electret , restoring force , spring (device) , energy harvesting , vibration , ferroelectricity , ferroelectric polymers , materials science , figure of merit , electric field , dipole , nonlinear system , electric potential energy , finite element method , acoustics , piezoelectricity , energy (signal processing) , engineering , physics , structural engineering , optoelectronics , composite material , dielectric , quantum mechanics

Previously, we succeeded in developing a new electret [termed a ferroelectric dipole electret (FDE)] having an extremely high electric field using a polarized ferroelectric material. However, the pull-in, in which an oscillator sticks to the FDE under its strong electrostatic force, poses a problem for practical vibration energy harvesters. In this study, we propose use of nonlinear restoring force of a spring with a stopper in order to prevent pull-in for FDE-based vibration energy harvesters. The spring with a stopper was designed using a finite element method (FEM) analysis such that the restoring force of the spring will exceed the electrostatic force of the FDE. The proposed harvester combines the FDE and the spring successfully, and generated electricity without the pull-in. It also showed the highest figure of merit of output power and wide frequency band when compared with other available electret-based vibration energy harvesters. © 2016 Author(s)

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