Abstract
Recently, research on energy harvesting system with piezoelectric ceramics has been conducted. To compensate for the problem of low generating power compared to other energy harvesters, many researchers have studied piezoelectric harvesters in order to obtain high output. In this paper, four kinds of unimorph based piezoelectric harvesters are proposed, and their generating characteristics are studied. The piezoelectric harvesters have three, four, six, and eight unimorph arms, respectively, and the arms are symmetrically arranged from one central point. The centrosymmetric structure of the harvesters guarantees more stable and multiplied generation compared to a cantilever-type harvester because the arms of the former harvester resonate at the same frequency. The resonance frequency, the output voltage, the displacement, and the stress characteristics of the generator were analyzed by using a finite element method (FEM) program. Harvesters were fabricated on the basis of the analysis results. Experimental results were compared with simulated results. Also, the efficiency of each model was verified.
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