Publisher DOI: 10.1038/s41560-018-0306-x
Title: Energy harvesting near room temperature using a thermomagnetic generator with a pretzel-like magnetic flux topology
Language: English
Authors: Waske, Anja 
Dzekan, Daniel 
Sellschopp, Kai  
Berger, Dietmar 
Stork, Alexander 
Nielsch, Kornelius 
Fähler, Sebastian 
Issue Date: 1-Jan-2019
Source: Nature Energy 1 (4): 68-74 (2019-01-01)
Journal or Series Name: Nature energy 
Abstract (english): © 2018, The Author(s), under exclusive licence to Springer Nature Limited. To date, there are very few technologies available for the conversion of low-temperature waste heat into electricity. Thermomagnetic generators are one approach proposed more than a century ago. Such devices are based on a cyclic change of magnetization with temperature. This switches a magnetic flux and, according to Faraday’s law, induces a voltage. Here we demonstrate that guiding the magnetic flux with an appropriate topology of the magnetic circuit improves the performance of thermomagnetic generators by orders of magnitude. Through a combination of experiments and simulations, we show that a pretzel-like topology results in a sign reversal of the magnetic flux. This avoids the drawbacks of previous designs, namely, magnetic stray fields, hysteresis and complex geometries of the thermomagnetic material. Our demonstrator, which is based on magnetocaloric plates, illustrates that this solid-state energy conversion technology presents a key step towards becoming competitive with thermoelectrics for energy harvesting near room temperature.
ISSN: 2058-7546
Institute: Keramische Hochleistungswerkstoffe M-9 
Type: (wissenschaftlicher) Artikel
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