Abstract
Harvesting vibration energy to power wearable devices has become a hot research topic, while the output power and conversion efficiency of a vibration energy harvester with a single electromechanical conversion mechanism is low and the working frequency band and load range are narrow. In this paper, a new structure of piezoelectric electromagnetic coupling up-conversion multi-directional vibration energy harvester is proposed. Four piezoelectric electromagnetic coupling cantilever beams are installed on the axis of the base along the circumferential direction. Piezoelectric plates are set on the surface of each cantilever beam to harvest energy. The permanent magnet on the beam is placed on the free end of the cantilever beam as a mass block. Four coils for collecting energy are arranged on the base under the permanent magnets on the cantilever beams. A bearing is installed on the central shaft of the base and a rotating mass block is arranged on the outer ring of the bearing. Four permanent magnets are arranged on the rotating mass block and their positions correspond to the permanent magnets on the cantilever beams. The piezoelectric cantilever is induced to vibrate at its natural frequency by the interaction between the magnet on cantilever and the magnets on the rotating mass block. It can collect the nonlinear impact vibration energy of low-frequency motion to meet the energy harvesting of human motion.
Highlights
Intelligent wearable devices have become a new application hotspot with the rapid development of electronic technology [1]
Each time the magnet of the rotating mass block and the magnet on the cantilever beam pass by, the cantilever will be excited to its maximum amplitude uM position and the cantilever will attenuate the vibration with its own natural frequency
Four piezoelectric electromagnetic coupling piezoelectric cantilever beams are installed on the axis of base along the circumferential direction
Summary
Intelligent wearable devices have become a new application hotspot with the rapid development of electronic technology [1]. The magnetic springs are made up of two button PMs adhered, respectively, to the end cap at each end of the carbon fiber tube to provide varying repulsive forces to the PM stack, resulting in enhanced resonance frequency band and higher efficiency in energy harvesting. This kind of energy harvester can only collect vibration energy in a certain direction [15,22], which has no obvious advantage for human motion or swing. IInn tthhiiss ppaappeerr,, aa nneeww eenneerrggyy hhaarrvveesstteerr tthhaatt ccoommbbiinneess ppiieezzooeelleeccttrriicc eelleeccttrroommaaggnneettiicc ccoouupplliinngg rreessoonnaannccee aannddupu-pco-cnovnevresirosniotnecthencohlnooglyogisyprisopporsoepdo. sBeydc.oBmypocsoimngpaosminugltiafiemldunltoi nfilienledarncoonulpinlienagr scyosutpemlinogfsfyosrtceem-eloecf tfroicrcitey--emleacgtrniceittiysm-m, aaghnigethisemr w, aorhkiignhgefrrweqoureknincyg bfraenqduecanncybebaonbdtacinaendb. eThobetained. uTph-ecuonpv-ceornsivoenrsteiocnhnteoclohgnyoliosguyseisdutosehdartovehsatrlvoewstfrloeqwufernecqyuvenibcryatvioibnraetnieorngeynaenrdgyroatnadtinrogtmatainsgs bmloacsks ibsloucskedis tuoseddrivtoe dprieivzeoepleiecztroiecleccatnritcilecvaenrtibleevaemr btoeaombttaoinobmtauilnti-mdiurletci-tdioinreacltieonnearlgeynheargrvyehstairnvge.sTtihnigs. pTahpiserpampaeirnmlyadinislycudsissecsutshseesptiheezopeileezcotreilcecetlreicctreolemctargonmetaigcnceotuicpclionugpmlinogdeml,oadneall,yazneaslythzeesfathcteofrasctthoarst athffaetcatfftheectptohwe perowofetrhoefstyhsetesmystaenmd atensdtsteitsstsenitesregnyecroglyleccotilolencteioffnecetffoenctthoen ethxpeeerxipmeernimtaelndteavl idceev. ice
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