Self-biased Dual-phase Energy Harvesting System
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Self-biased Dual-phase Energy Harvesting System Yuan Zhou1,*, Amar Bhalla2 and Shashank Priya1,* 1
Bio-inspired Materials and Devices Laboratory (BMDL) Center for Energy Harvesting Materials and Systems (CEHMS) Virginia Tech, Blacksburg, VA 24061, USA 2 Department of Electrical Engineering, University of Texas at San Antonio, TX. *
Corresponding Author: Yuan Zhou, [email protected]
ABSTRACT In this study, we report the design and fabrication of a dual-phase energy harvester which can synchronously harvest both mechanical and magnetic energy in the absence of DC magnetic field. The harvester consists of a magnetostrictive cantilever beam and a magnetostrictive/ piezoelectric (M/P) self-biased laminate composite structure. This structure allows us to utilize piezoelectric and self-biased magnetoelectric effect simultaneously. By combining these mechanisms together, a sum effect for harvesting both magnetic and vibration energy was realized under DC magnetic field free condition. The bilayer structure provides a simplified geometry that can be easily incorporated into MEMS devices. We demonstrate a hybrid synthesis method for fabrication of complex three-dimensional thin films using a cost-effective and maskless aerosol jet deposition process. The combination of the hybrid aerosol jet process with dual phase harvester design provides the opportunity to fabricate small scale power sources required for structural health monitoring applications. INTRODUCTION There is an increasing demand for incorporation of battery recharging systems for structural health monitoring sensor networks [1]. To support this demand, unused power can be tapped from freely available sources such as industrial machines, transportation vehicles, human activity, buildings, sunlight, and wind [2,3]. Among these sources, large induction motors commonly used in industrial manufacturing plants are promising source for recovering energy due to the simultaneous presence of periodic vibrations generated by the rotor and stray magnetic field from the windings. In order to harvest both the mechanical and magnetic energy, a mechanism is required that can respond to both the inputs. In this study, we demonstrate a magnetoelectric energy harvester that can synchronously harvest both mechanical and magnetic energies, termed as a dual-phase energy harvester. Recently, much attention has been paid towards magnetoelectric (ME) composites that utilize product property of materials [4-7]. In this case, the elastic coupling occurring at the interface of piezoelectric and magnetostrictive phase allows conversion of magnetic field into electric field or vice-versa [4,6]. Accordingly, ME composites possesses great potential for capturing and delivering both mechanical and magnetic energy as a dual-phase energy harvester. In direct ME effect, the measured coupling coefficient is the ratio between the applied AC magnetic field (Hac) and the induced AC electric field (Eac), ME=dEac/dHac, which is directly related to the effectiveness of elastic coupling between two phases
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