雙穩(wěn)態(tài)磁致伸縮能量采集器的動態(tài)特性
付美真，曹淑瑛，瞿林飛，鄭加駒，王博文
（河北工業(yè)大學(xué) 電磁場與電器可靠性省部共建重點實驗室，天津 300130）
摘 要：介紹了利用非線性來提高磁致伸縮能量采集系統(tǒng)效率的原理，建立了雙穩(wěn)態(tài)磁致伸縮能量采集器的集中參數(shù)模型，給出了兩磁體之間的磁力數(shù)學(xué)表達(dá)式并驗證了其正確性。分析了磁體之間的距離對系統(tǒng)特性的影響，結(jié)果表明：在外部非線性磁力的作用以及合適的磁體間距下，磁致伸縮懸臂梁會構(gòu)成一個雙穩(wěn)態(tài)系統(tǒng)；相同激勵幅值下，通過改變激勵頻率和磁體間距形成雙穩(wěn)態(tài)特性，可提高能量的采集效率。
關(guān)鍵詞：Galfenol 懸臂梁；振動能量采集；磁力；磁機(jī)電耦合
中圖分類號：TM153；TM619 文獻(xiàn)標(biāo)識碼：A 文章編號：1007-3175(2017)02-0013-05
Dynamic Characteristics of Bistable Magnetostrictive Energy Harvester
FU Mei-zhen, CAO Shu-ying, QU Lin-fei, ZHENG Jia-ju,WANG Bo-wen
（Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability,
Hebei University of Technology, Tianjin 300130, China）
Abstract: Introduction was made to the principle using the nonlinear to improve the efficiency of the magnetostrictive energy harvesting system. This paper established a lumped parameter model of bi-stable magnetostrictive energy harvester, gave the magnetic force mathematical expressions between two magnetic bodies and verified their correctness. This paper analyzed the impacts of the distance between the magnets on the system characteristics. The results show that in the nonlinear effect of external magnetic and suitable magnet spacing, the magnetostrictive cantilever would constitute a bi-stable system, and under the same excitation amplitude, the excitation frequency and magnet spacing were changed to form bi-stable state characteristic, which could improve the efficiency of energy harvesting.
Key words: Galfenol cantilever; vibration energy harvesting; magnetic force; magnetic electromechanical coupling
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