Passive force balancing of an active magnetic regenerative liquefier

•A passive force balancing structure is proposed for a dual-regenerator AMR.•A magnetostatic model is developed and validated with force measurements.•A genetic algorithm identifies a passive structure with near-ideal balancing. Active magnetic regenerators (AMR) have the potential for high efficien...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2018-04, Vol.451 (C), p.79-86
Main Authors: Teyber, R., Meinhardt, K., Thomsen, E., Polikarpov, E., Cui, J., Rowe, A., Holladay, J., Barclay, J.
Format: Article
Language:English
Subjects:
Active magnetic regenerator
Chemical compounds
Computer simulation
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Configurations
Gadolinium
Genetic algorithm
Genetic algorithms
Liquefaction
Magnetic materials
Magnetism
Regenerators
Superconducting
Superconductivity
Waveforms
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Description
Summary:•A passive force balancing structure is proposed for a dual-regenerator AMR.•A magnetostatic model is developed and validated with force measurements.•A genetic algorithm identifies a passive structure with near-ideal balancing. 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.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2017.11.002