An electromagnetic vibration energy harvester with compact flexure guide for low frequency applications

Lujie Wang (Corresponding / Lead Author), Tinghao Liu, Guangbo Hao, Chitta Saha, Lei Liu, TinCong Ye, Zhengmin Zhang, Ningning Wang

    Research output: Contribution to journalArticlepeer-review


    This paper presents the design, modeling, fabrication, and characterization of a novel electromagnetic vibration energy harvester (EVEH) using a compact flexure guide structure and opposing permanent magnets. The flexure guide is a unique cylindrical structure, and can transfer force and motion by the deformation of elastic beams. It allows the single-degree-of-freedom motion characteristic, and eliminates the friction between the permanent magnets and the housing structure, which exists in mostly reported magnet-spring based vibration energy harvesters. The structure also greatly reduces the spacing between the coil and the permanent magnets, which considerably increases the magnetic flux linkage through the coil. Experimental results show that the EVEH prototype can generate an output voltage of 6.08 V and output power of 4.02 mW from 0.1 g acceleration at resonant(19.5 Hz), achieving a normalized power density of 3.28 mW/cm3g2. In addition, the flexure guide can be directly fabricated by 3D printing, which greatly simplifies the harvester assembly compared to other electromagnetic vibration energy harvesters reported. In terms of the proposed EVEH, a self-powered sensor network is implemented to transfer the GPS data to some appointed terminals.
    Original languageEnglish
    JournalSmart Materials and Structures
    Issue number1
    Publication statusPublished (VoR) - 19 Dec 2023


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