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- Rodriguez, Elkin, et al.
(författare)
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Designing, simulations and experiments of a passive permanent magnet bearing
- 2016
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Ingår i: International journal of applied electromagnetics and mechanics. - 1383-5416 .- 1875-8800. ; 51:2, s. 131-149
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents simulations and experimental results for two types of Passive Permanent Magnet Bearings. The bearing system under investigation consists of two permanent magnet rings opposing to each other in two different configurations. The influence of parameters, such as thickness and radius of permanent magnets, in the force is presented through FEM calculations. Two setups of passive magnetic bearings have been built. Static measurements of radial and axial forces are reported and results compared with simulations. Also, dynamic tests show the behavior of the bearing and the magnitudes of force in the foothold. The results are presented to show trends in the parameters, so the conclusions are applicable for other sizes and applications. As an example, the application as a top bearing for a 12 kW vertical axis wind turbine is considered.
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- Sotelo, G.G., et al.
(författare)
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Tests with a hybrid bearing for a flywheel energy storage system
- 2016
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Ingår i: Superconductors Science and Technology. - : IOP Publishing. - 0953-2048 .- 1361-6668. ; 29:9
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes the design and experimental test of a passive magnetic bearing system composed by a superconductor magnetic bearing (SMB) and a permanent magnet bearing (PMB). This bearing setup is part of a flywheel energy storage system. The advantage of using a passive bearing system is that it offers low friction without the need of a magnetic bearing controller, increasing the reliability and decreasing the energy consumption. The first set of tests were quasi-static radial and axial force measurements of the PMB operating alone and together with the SMB. As the PMB is intrinsically unstable in one degree of freedom, the operation of the SMB together with the PMB is necessary to stabilize the system. After that, dynamic measurements were made for the SMB operating alone and together with the PMB. The resonant speeds were identified and the bearing radial and axial forces were also measured for the SMB and SMB + PMB operation. These results indicate that the studied bearing set is technologically feasible to be used in flywheel energy storage systems.
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- Andersen A.C., Sotelo J.A., Pustovit V.N., Niklasson G.A.
(författare)
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Interstellar extinction by fractal polycrystalline graphite clusters?
- 2002
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Ingår i: Electromagnetic and Light Scattering by Non-spherical Particles. - : Army Research Laboratory. ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- Certain dust particles in space are expected to appear as clusters of individual grains. The morphology of these clusters could be fractal or compact. To determine how these structural features would affect the interpretation of the observed interstellar
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