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A passive current sensor employing self-biased magnetoelectric transducer and high-permeability nanocrystalline flux concentrator

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Rare Metals 2022年第7期41卷 2343-2348页

作者： Ji-Tao Zhang Yu-Mei Wen Ping Li Research Center of Sensors and Instruments College of Optoelectronic EngineeringChongqing UniversityChongqing 400044China Department of Smart Grids and Information Engineering College of Electric and Information EngineeringZhengzhou University of Light IndustryZhengzhou 450002China

A passive current sensor,consisting of SmFe_(2)/PZT/SmFe_(2)self-biased magnetoelectric(ME)composite and Fe_(73.5)Cu_(1)Nb_(3)Si_(13.5)B_(9)nanocrystalline flux concentrator for weak current detection at power-line frequency,was fabricated and characterized.Giant magnetostrictive material of SmFe_(2)plate with large anisotropic constant provides a huge internal anisotropic field to bias the ME transducer in closed magnetic loop.Consequently,the additional magnetomotive force induced by the internal field and the corresponding increased effective permeabil-ity contribute to the improvement of the sensitivity.Experimental results demonstrate that the presented sensor has a higher sensitivity of 152 mV·A^(-1)at 50 Hz with a slight nonlinearity of~0.01%full scale(FS)and matches well with the predicted value.This presented current-sensing device exhibits approximately 2.3 times higher sensitivity than that of conventional ME composite with[Pb(Zr_(0.48),Ti_(0.52)O_(3)](PZT)and Terfenol-D plates serving as a key sensitive component.In addition,time stabilities of the presented sensor were evaluated for a long period of 72 h and analyzed through mathematical statistics method,and favorable stabilities with an uncertainty of 0.5μV are obtained in continuous 1 h testing.These results provide a significant advancement toward promising application of the tri-layer self-biased ME laminate for power-line elec-tric cords monitoring.

关键词： Magnetoelectric effects Current sensor magnetic flux concentrator Magnetostrictive rare earth iron alloys

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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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