Electromagnetic energy harvesting from ambient vibration using permanent magnet linear oscillator

In recent years, with the advancement of IoT technology, energy harvesting from vibration has attracted attention as one of the methods to supply operating power to sensors. This is because vibrational energy exists universally in nature and has high versatility. The purpose of our study is to obtain design guidelines for energy harvesters with high energy conversion efficiency through vibration testing and analytical modeling. In this study, we propose an energy harvester that generates power by the principle of electromagnetic induction caused by vibrating two permanent magnets that are linearly placed along a cylindrical housing. The prototype of the harvester has been designed and fabricated. In this report, we present the results of the vibration tests of the prototype of the harvester. The experiment was performed by mounting the harvester on an electrodynamic shaker and applying base excitation to the harvester. Parametric studies have been conducted by changing the conditions such as the polarity of the magnets, the displacement amplitude and the frequency of the input base displacement. Based on the analysis results, it is shown that it increases the amount of generated power when the magnets are installed with opposite polarity with each other.