A novel miniature thermomagnetic energy harvester

Chin Chung Chen, Tien-Kan Chung, Chi Cheng Cheng, Chia Yuan Tseng

研究成果: Conference contribution

5 引文 斯高帕斯(Scopus)

摘要

Nowadays, thermal-energy-harvesting is an important research topic for powering wireless sensors. Among numerous thermal-energy-harvesting approaches, some researchers demonstrated novel thermomagnetic-energy harvesters to convert a thermal-energy from an ambient temperature-difference to an electrical-output to power the sensors. However, the harvesters are too bulky to be integrated with the sensors embedded in tiny mechanical-structures for some structuralhealth- monitoring applications. Therefore, miniaturized harvesters are needed. Hence, we demonstrate a miniature thermomagnetic-energy harvester. The harvester consists of CuBe-beams, PZT-piezoelectric-sheet, Gd-soft-magnet, NdFeB-hard-magnet, and mechanical-frame. The piezoelectric-sheet and soft-magnet is bounded at fixed-end and freeend of the beams, respectively. The mechanical-frame assembles the beams and hard-magnet. The length× width×thickness of the harvester is 2.5cm×1.7cm×1.5cm. According to this, our harvester is 20-times smaller than the other harvesters. In the initial-state of the energy-harvesting, the beams' free-end is near the cold-side. Thus, the soft-magnet is cooled lower than its curie temperature (Tc) and consequently changed from paramagnetic to ferromagnetic. Therefore, a magnetic-attractive force is produced between the soft-magnet and hard-magnet. Consequently, the beams/soft-magnet are down-pulled toward the hard-magnet fixed on the hot-side. The soft-magnet closing to the hot-side is heated higher than its Tc and subsequently changed to paramagnetic. Consequently, the magnetic-force is eliminated thus the beams are rebounded to the initial-state. Hence, when the harvester is under a temperature-difference, the beams' pulling-down/back process is cyclic. Due to the piezoelectric effect, the piezoelectric-sheet fixed on the beams continuously produces voltage-response. Under the temperature-difference of 29°C, the voltage-response of the harvester is 30.4 mV with an oscillating-frequency of 0.098 Hz.

原文English
主出版物標題Active and Passive Smart Structures and Integrated Systems 2014
發行者SPIE
ISBN(列印)9780819499837
DOIs
出版狀態Published - 1 一月 2014
事件Active and Passive Smart Structures and Integrated Systems 2014 - San Diego, CA, United States
持續時間: 10 三月 201413 三月 2014

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
9057
ISSN(列印)0277-786X
ISSN(電子)1996-756X

Conference

ConferenceActive and Passive Smart Structures and Integrated Systems 2014
國家United States
城市San Diego, CA
期間10/03/1413/03/14

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