Demonstration of Principle of Low-temperature Thermal Power Generation Using Combination of Magnetic Phase Transformation Alloy and Magnetostrictive Vibrational Power Generator

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  • 磁気相変態合金と磁歪振動発電を合わせた低温熱発電の原理実証

Abstract

<p>Ni-Co-Mn-Sn metamagnetic shape memory alloys are known to show drastic change of magnetization upon martensitic transformation. For a selected composition, a steep magnetization change occurs slightly above room temperature. In this paper, we propose a structure which generates change of magnetic force by temperature difference between the room temperature and heat source using the alloy and two permanent magnets. By combining the structure and a magnetostrictive vibrational power generator consisting of Fe-Ga alloy plate, U-shaped frame, coil, and magnet, electrical energy can be taken out from a heat source of about 50°C. As this principle demonstration, the prototype using plate of Ni-Mn-Co-Sn alloy of 10×10×1.5 mm was confirmed that adsorption (heating of the alloy) and desorption (cooling) were repeated in about 200 seconds, and power generation by free vibration was carried out every time. It will be possible to extract energy necessary for radio communication from a low temperature heat source.</p>

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