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Boosting the energy harvesting performance of cantilever structured magneto-mechano-electric generator by controlling magnetic flux intensity on magnet proof mass

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Journal of Materiomics 2023年第4期9卷 735-744页

作者： Deepak R.Patil Seungah Lee Atul Thakre Ajeet Kumar Hyunseok Song Dae-Yong Jeong Jungho Ryu School of Materials Science and Engineering Yeungnam UniversityGyeongsan38541South Korea Centre for Functional Materials Vellore Institute of TechnologyVellore632014TamilnaduIndia Department of Materials Science&Engineering Inha UniversityIncheon22212South Korea Institute of Materials Technology Yeungnam UniversityDaehak-roGyeongsan38541South Korea

A cantilever-structured magneto-mechano-electric(MME)generator comprising a magnetoelectric composite with a magnet proof mass is a potential candidate for powering autonomous wireless sensor networks.Recently,the concept of a magnetic flux concentrator(MFC)to enhance the output performance of the MME generator by focusing the ultralow-intensity magnetic field into the MME generator was introduced.However,the MFC-concentrated magnetic flux mostly focused on the end tip of the MME cantilever rather than at the magnet proof mass located on the cantilever beam.Considering that the torque generated by the magnet proof mass contributes more than half of the output power of an MME generator,optimizing the volume and position of the proof-mass with MFC is crucial for better performance.Furthermore,a smaller proof-mass is desirable for the long-term reliability of cantilevertype harvesters.Hence,we investigated the effect of the position and weight(volume)of the magnet proof mass with respect to the MFC on the output performance of the MME generator through finite element analysis and experiments.The MME generator with the lighter magnet proof mass at the optimized position generated a maximum power of 5.35 mW under a 10 Oe magnetic field,which was 210%of that of the MME configuration used in our previous study.Furthermore,the MME generator showed broadband characteristics around the practical frequency of 60 Hz,which could provide more freedom to design the harvester with high performance.

关键词： magneto-mechano-electric magnetic flux concentrator magnet proof mass Broadband IoT sensor

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