Giamag Technologies As

Arne Skjeltorp

Geir Helgesen

The magnetic bearings make use of magnet assemblies with a high magnetic field gradient. The magnet assemblies use two permanent magnets with opposite polarization in a Kittel open domain structure. The basic factor of magnetic separation is the magnetic force, which acts on a particle of the substance and which is proportional to the magnetic susceptibility of the substance, the value of the magnetic induction B and the value of the gradient &#x2207;B of the applied magnetic field. Therefore, increasing the sensitivity and selectivity of magnetic separation will require use of the highest possible values of magnetic induction B and magnetic field gradient &#x2207;B, or their united factor&#x2014;the product B&#x2207;B. The magnetic assembly have repulsive magnetic systems each having two juxtaposed permanent magnetswith opposite magnetization in the form of a Kittel open domain structure. In such an system, near the edges of the faces of the joining magnets, a strong magnetic stray field appears and the value of the product B&#x2207;B reaches 10mT/m. To concentrate the magnetic stray field shieldsare provided on top of the two magnetswith a gapbetween the shields at the joint of the two magnetsforming zones of high magnetic field gradientwith increased magnitude for the product B&#x2207;B.

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Ski, Norway

Arne Skjeltorp