Abstract
The purpose of the presented work is to introduce the novel design of electrostatic energy harvester using bistable mechanism with compensational springs in gravity field capable of providing the output of several μW under the excitation of extremely small amplitude (up to 0.2g) and low frequency (10-100Hz). Presented energy harvester uses the bistable hysteresis modification to achieve low-frequency low-amplitude sensibility. It was demonstrated with finite element modelling (FEM) that hysteresis width produced by bistability is changing with a constant linear coefficient as a function of a compensational spring stiffness and thus a device sensitivity could be adjusted to the minimum point for the amplitude of external excitation. Further, highly non-linear bistable double curved beam mechanism assures the high sensitivity in frequencial domain due to the non-defined bandwidth. The equivalent circuit technique is used for simulating the device performance.
Highlights
Today energy harvesting aims towards offering the solutions for supplying the variety of standalone devices with the electricity
The inertial force is acting upon the seismic mass, which leads to the switching between stable positions of bistable mechanism
It happens due to bistable hysteresis modification with linear spring
Summary
Today energy harvesting aims towards offering the solutions for supplying the variety of standalone devices with the electricity. It is explained by the fact that the switching between stable positions depends only on the value of the force applied, and frequency dependence is significantly suppressed due to the presence of strong non-linearity. Another innovation of the offered mechanism is the use of a gravitational effect. In MEMS domain gravitational offset is either neglected due to the low masses involved [1], either is meant to be perpendicular to the operational plane of the device [2] In this case, when the device is aligned with gravitational force it is not expected to be functional.
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