Recently,different nonlinear energy harvesters were designed to harvest energy from various rotational motions,which aim to provide power to self-powered wireless sensors.In this paper,a quad-stable piezoelectric energy harvester,comprising of a piezoelectric beam and magnets,is designed to enhance energy harvesting efficiency in rotational motion.In addition,a theoretical model is derived to describe the dynamic performance and the output voltage of the harvester.Furthermore,experimental results demonstrate that the presented harvester in rotational motion exhibits a wider working frequency range compared with that of the bi-stable one.Most importantly,for the rotational speed range of 60-420 rpm(1-7 HZ),the inter-well oscillation for the harvester can be achieved and corresponding peak voltage is higher than 10 V,which can be used to power wireless sensors.Overall,the quad-stable piezoelectric energy harvester is experimentally verified to be suitable for the low-frequency rotational environment.
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