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Open AccessArticle

Design and Analysis of a Magnetically Coupled Multi-Frequency Hybrid Energy Harvester

School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
School of Medicine, Zhejiang University, Hangzhou 310058, China
Dalian Huarui Heavy Industry Group Co., Ltd., Dalian 116031, China
CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130062, China
Author to whom correspondence should be addressed.
Sensors 2019, 19(14), 3203;
Received: 10 June 2019 / Revised: 11 July 2019 / Accepted: 18 July 2019 / Published: 20 July 2019
(This article belongs to the Special Issue Piezoelectric Transducers)
PDF [4904 KB, uploaded 20 July 2019]


The approach to improve the output power of piezoelectric energy harvester is one of the current research hotspots. In the case where some sources have two or more discrete vibration frequencies, this paper proposed three types of magnetically coupled multi-frequency hybrid energy harvesters (MHEHs) to capture vibration energy composed of two discrete frequencies. Electromechanical coupling models were established to analyze the magnetic forces, and to evaluate the power generation characteristics, which were verified by the experimental test. The optimal structure was selected through the comparison. With 2 m/s2 excitation acceleration, the optimal peak output power was 2.96 mW at 23.6 Hz and 4.76 mW at 32.8 Hz, respectively. The superiority of hybrid energy harvesting mechanism was demonstrated. The influences of initial center-to-center distances between two magnets and length of cantilever beam on output power were also studied. At last, the frequency sweep test was conducted. Both theoretical and experimental analyses indicated that the proposed MHEH produced more electric power over a larger operating bandwidth. View Full-Text
Keywords: hybrid energy harvester; magnetically coupled; multi-frequency; electromechanical; broadband hybrid energy harvester; magnetically coupled; multi-frequency; electromechanical; broadband

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Xu, Z.; Yang, H.; Zhang, H.; Ci, H.; Zhou, M.; Wang, W.; Meng, A. Design and Analysis of a Magnetically Coupled Multi-Frequency Hybrid Energy Harvester. Sensors 2019, 19, 3203.

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