2013
DOI: 10.1088/0964-1726/22/5/055005
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Multi-physics model of a thermo-magnetic energy harvester

Abstract: Harvesting small thermal gradients effectively to generate electricity still remains a challenge. Ujihara et al (2007 Appl. Phys. Lett. 91 093508) have recently proposed a thermo-magnetic energy harvester that incorporates a combination of hard and soft magnets on a vibrating beam structure and two opposing heat transfer surfaces. This design has many advantages and could present an optimum solution to harvest energy in low temperature gradient conditions. In this paper, we describe a multi-physics numerical m… Show more

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Cited by 30 publications
(21 citation statements)
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“…The magnetic induction B in the ferromagnetic material is related to magnetization and applied magnetic field as [142,144]:B(H,T)=μ0[H+M(H,T)] where μ0 is permeability of free space, H is applied magnetic field, and M is magnetization, which is function of applied field and its temperature. For a thermomagnetic process, the power P and energy E supplied by voltage source to the unit volume of ferromagnetic material can be calculated as [142,143,145]:P=viAL=HdBdt E=Pdt=H dB=μ0H dH+μ0H dM…”
Section: Thermomagnetic Energy Harvestingmentioning
confidence: 99%
“…The magnetic induction B in the ferromagnetic material is related to magnetization and applied magnetic field as [142,144]:B(H,T)=μ0[H+M(H,T)] where μ0 is permeability of free space, H is applied magnetic field, and M is magnetization, which is function of applied field and its temperature. For a thermomagnetic process, the power P and energy E supplied by voltage source to the unit volume of ferromagnetic material can be calculated as [142,143,145]:P=viAL=HdBdt E=Pdt=H dB=μ0H dH+μ0H dM…”
Section: Thermomagnetic Energy Harvestingmentioning
confidence: 99%
“…TMEG operation was characterized under ambient condition similar to that for the UAVs at altitudes of ~60,000 ft where the outside temperature decreases up to ~−80 °C 29 . Figure 2a shows output voltage of the fabricated TMEG with unimorph PVDF cantilever at a thermal gradient of 80 °C.…”
Section: Resultsmentioning
confidence: 99%
“…Recently, carbon nanotube thermal interface has been employed for increasing the heat transfer from soft ferromagnetic material 28 . Theoretical approach towards optimizing the interactions between magnets and magnitude of device-relevant parameters that influence the dynamic behavior of the overall system has been reported 29 . Here, we demonstrate feasible and practical TMEG arrays, composed of flexible and lightweight piezoelectric polyvinylidene difluoride (PVDF) bimorph cantilevers.…”
mentioning
confidence: 99%
“…This situation exists despite pioneering advances made over the last fifty years on developing energy harvesters based on thermoelectrics, 1 pyroelectrics, 2,3 ferroelectrics, 4 ferromagnets, [5][6][7] and shape memory metals. 8,9 We here harvest thermal energy as electrical energy by using the newly discovered thermally powered torsional and tensile actuation of artificial muscles made from inexpensive, highly-twisted fishing line or sewing thread.…”
Section: Introductionmentioning
confidence: 99%