Multi-directional electromagnetic vibration energy harvester using circular Halbach array

Jing Qiu,Qijie Chang,Jing Wen,Wei Hu,Zhenwen Hu,Jin Yang,Xin Liu,Yuan Gao,Xiaosheng Tang

doi:10.1063/1.4978403

Jing Qiu, Qijie Chang + Show 7 more

Open Access

https://doi.org/10.1063/1.4978403

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Journal: AIP Advances	Publication Date: Mar 8, 2017
Citations: 15	License type: CC BY 4.0

Affiliation: Chongqing University, Northeastern University

Abstract

In this paper, a multi-directional electromagnetic vibration energy harvester (EVEH) using the circular Halbach array (HA) is presented based on the Faraday’s law of electromagnetic induction. The circular HA is a specific arrangement of permanent magnets which could concentrate the magnetic field inside the circular array by a certain rule, while reduce the magnetic field outside the circular array to almost zero at the same time. The HA could break through the limitation of the related published vibration energy harvesters that could work in only one single direction. Thus, it could optimize the collecting efficiency. The experimental results show that the presented harvester could generate considerable electric output power in all vibrating directions. An optimal output power is 9.32 mW at a resonant frequency of 15.40 Hz with an acceleration of 0.5 g (with g=9.8 m/s2) across a 700-turn coil in the vibrating direction of 90°, which is 1.53 times than the minimum optimal one in the direction of 45°. The EVEH using the circular HA could work in all directions and generate considerable electric output power, which validates the feasibility of the EVEH that works in all directions and is beneficial for improving the practical application.

Highlights

The circular HA is a specific arrangement of permanent magnets which could concentrate the magnetic field inside the array while reduce the magnetic field outside the circular array to almost zero at the same time.[15]
In the all vibrating directions inside the circular HA, the proposed EVEH could generate considerable electric energy, which break through the limitation in some EVEHs that could work in only one direction and optimizes the collecting efficiency significantly
This paper presents a multi-directional EVEH to scavenge mechanical vibration energy existing in the ambient environment

Summary

PRINCIPLE HEADING

With a huge amount of applications of the wireless sensor network (WSN) in industry, the conventional battery with limited-life and high-cost has restricted the development in some degree.[1,2,3,4,5] scavenging the mechanical vibration energy that has high power density and widespread existence from ambient environment provides an efficient and potential solution.[6,7,8] In most of the related published papers, the vibration energy harvesters (VEH) work in a single direction.[9,10,11] the vibrating direction in reality always varies with time in the actual environment, which leads that the energy in other directions will be wasted for nothing.[12,13,14] The circular HA is a specific arrangement of permanent magnets which could concentrate the magnetic field inside the array while reduce the magnetic field outside the circular array to almost zero at the same time.[15]. An EVEH with a circular HA is presented. As the circular HA could generate a toroidal magnetic field inside the array, when compared to the EVEH that could work only in one single direction, the proposed EVEH in this paper could generate considerable electric energy in all vibrating directions and reduce the electromagnetic interference on the electronic components around the EVEH significantly

HARVESTER DESIGN AND ANALYSIS MODEL

EXPERIMENT RESULTS AND DISCUSSION

CONCLUSION