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Passive force balancing of an active magnetic regenerative liquefier

TitlePassive force balancing of an active magnetic regenerative liquefier
Publication TypeJournal Article
Year of Publication2018
AuthorsTeyber, R, Meinhardt, K, Thomsen, E, Polikarpov, E, Cui, J, Rowe, A, Holladay, J, Barclay, J
JournalJournal of Magnetism and Magnetic Materials
Date Published04
Type of ArticleArticle
ISBN Number0304-8853
Accession NumberWOS:000428259800014
Keywordsactive magnetic regenerator, amr, cost, design, gadolinium, Genetic algorithm, hydrogen liquefaction, Liquefaction, Materials Science, performance, physics, refrigerator, superconducting, temperature, Thermodynamics

Active magnetic regenerators (AMR) have the potential for high efficiency cryogen liquefaction. One active magnetic regenerative liquefier (AMRL) configuration consists of dual magnetocaloric regenerators that reciprocate in a persistent-mode superconducting solenoid. Issues with this configuration are the spatial and temporal magnetization gradients that induce large magnetic forces and winding currents. To solve the coupled problem, we present a force minimization approach using passive magnetic material to balance a dual-regenerator AMR. A magnetostatic model is developed and simulated force waveforms are compared with experimental measurements. A genetic algorithm identifies force-minimizing passive structures with virtually ideal balancing characteristics. Implementation details are investigated which affirm the potential of the proposed methodology. Published by Elsevier B.V.

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