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Publikováno v:
Published in Journal of Magnetism and Magnetic Materials, Vol. 437, 78-85, 2017
Topology optimization of permanent magnet systems consisting of permanent magnets, high permeability iron and air is presented. An implementation of topology optimization for magnetostatics is discussed and three examples are considered. First, the H
Externí odkaz:
http://arxiv.org/abs/1609.08113
Publikováno v:
Published in International Journal of Refrigeration, Vol. 63 , 48-62, 2016
The total cost of a 25 W average load magnetic refrigerator using commercial grade Gd is calculated using a numerical model. The price of magnetocaloric material, magnet material and cost of operation are considered, and all influence the total cost.
Externí odkaz:
http://arxiv.org/abs/1605.02524
Publikováno v:
Journal of Magnetism and Magnetic Materials, Vol. 384, 128-132, 2015
The maximum magnetic efficiency of a general multipole Halbach cylinder of order $p$ is found as function of $p$. The efficiency is shown to decrease for increasing absolute value of $p$. The optimal ratio between the inner and outer radius, i.e. the
Externí odkaz:
http://arxiv.org/abs/1502.06700
Autor:
Lefmann, K., Jacobsen, H., Garde, J., Hedegard, P., Wischnewski, A., Ancona, S. N., Jacobsen, H. S., Bahl, C. R. H., Kuhn, L. Theil
We present experimental, numerical, and theoretical evidence for a new mode of antiferromagnetic dynamics in nanoparticles. Elastic neutron scattering experiments on 8 nm particles of hematite display a loss of diffraction intensity with temperature,
Externí odkaz:
http://arxiv.org/abs/1501.00313
Publikováno v:
International Journal of Refrigeration, Vol. 34 (8), 1805-1816, 2011
An expression is determined for the mass of the magnet and magnetocaloric material needed for a magnetic refrigerator and these are determined using numerical modeling for both parallel plate and packed sphere bed regenerators as function of temperat
Externí odkaz:
http://arxiv.org/abs/1410.6248
Publikováno v:
Journal of Applied Physics, Vol. 114 (5), 053912, 2013
A metamaterial magnetic flux concentrator is investigated in detail in combination with a Halbach cylinder of infinite length. A general analytical solution to the field is determined and the magnetic figure of merit is determined for a Halbach cylin
Externí odkaz:
http://arxiv.org/abs/1410.6249
Publikováno v:
IEEE Transactions on Magnetics, Vol. 47 (6), 1687-1692, 2011
A general scheme for increasing the difference in magnetic flux density between a high and a low magnetic field region by removing unnecessary magnet material is presented. This is important in, e.g., magnetic refrigeration where magnet arrays has to
Externí odkaz:
http://arxiv.org/abs/1410.2679
Publikováno v:
Journal of Magnetism and Magnetic Materials, Vol. 322 (22), 3664-3671, 2010
A permanent magnet assembly in which the flux density can be altered by a mechanical operation is often significantly smaller than comparable electromagnets and also requires no electrical power to operate. In this paper five permanent magnet designs
Externí odkaz:
http://arxiv.org/abs/1410.2681
Publikováno v:
Journal of Magnetism and Magnetic Materials, Vol. 322 (21), 3324-3328, 2010
A magnet designed for use in a magnetic refrigeration device is presented. The magnet is designed by applying two general schemes for improving a magnet design to a concentric Halbach cylinder magnet design and dimensioning and segmenting this design
Externí odkaz:
http://arxiv.org/abs/1410.1987