Magnetostrictive materials can play an important role in the realization of energy harvesters, a topic of growing scientific and industrial interest, because of their high-specific energy. Important applications are reported in the literature regarding Fe–Ga and rare-earth based harvester cores, but these materials are not suitable for exploiting low-energy vibrations. In this paper, we discuss the properties and behavior of a harvester based on a magnetostrictive amorphous core. It is made of a bundle of suitably strained (preloaded) Fe-based amorphous strips directly subjected to axial vibration. Using five 20 μm thick strips of width 10 mm and length 60 mm, the harvester can generate 18 μW under a vibration-generated sinusoidal stress of 2.3 MPa at 300 Hz. Such a power is equivalent to a ∼3 μW/cm3 power density. We discuss the role of the physical and geometrical parameters on the performance of the harvester and provide a modeling approach successfully validating the device performance
A study on energy harvesting by amorphous strips / Zucca, Mauro; Bottauscio, Oriano; Beatrice, Cinzia; Hadadian, A; Fiorillo, F; Martino, L.. - In: IEEE TRANSACTIONS ON MAGNETICS. - ISSN 0018-9464. - 50:11(2014), pp. 8002104.8002104-8002104.8002104-4. [10.1109/TMAG.2014.2327169]
A study on energy harvesting by amorphous strips
ZUCCA, MAURO;BOTTAUSCIO, ORIANO;BEATRICE, CINZIA;
2014
Abstract
Magnetostrictive materials can play an important role in the realization of energy harvesters, a topic of growing scientific and industrial interest, because of their high-specific energy. Important applications are reported in the literature regarding Fe–Ga and rare-earth based harvester cores, but these materials are not suitable for exploiting low-energy vibrations. In this paper, we discuss the properties and behavior of a harvester based on a magnetostrictive amorphous core. It is made of a bundle of suitably strained (preloaded) Fe-based amorphous strips directly subjected to axial vibration. Using five 20 μm thick strips of width 10 mm and length 60 mm, the harvester can generate 18 μW under a vibration-generated sinusoidal stress of 2.3 MPa at 300 Hz. Such a power is equivalent to a ∼3 μW/cm3 power density. We discuss the role of the physical and geometrical parameters on the performance of the harvester and provide a modeling approach successfully validating the device performanceI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
