Magnetic bearing device

Details Magnetic bearing device Magnetic bearing device

F - Mech Eng,Light,Heat,Weapons

16

C

F16C 32/04 (2006.01)

Patent

CA 2672846

A magnetic bearing device has a rotating shaft (3) and a bearing structure (5) for supporting the rotating shaft (3) by magnetic force. The bearing structure (5) has magnetic pole parts (7) opposed to the outer peripheral surface of the rotating shaft (3) and surrounding the rotating shaft (3), and supports without contact the rotating shaft (3) by magnetic force generated between the magnetic pole parts (7) and the rotating shaft (3). Depressions (9) are formed in the surface of the rotating shaft. At least one of the factors of the shape, the positions, and the quantity of the depressions is set so that an eddy current generated on the surface of the rotating shaft is suppressed by rotation of the rotating shaft (3) and by a magnetic field caused by the magnetic pole parts (7).

L'invention crée un dispositif formant palier magnétique qui comporte un arbre tournant (3) et une structure de palier (5) destinée à supporter l'arbre tournant (3) par une force magnétique. La structure de palier (5) comporte des parties formant pôle magnétique (7) opposées à la surface périphérique externe de l'arbre tournant (3) et entourant l'arbre tournant (3), et supporte sans contact l'arbre tournant (3) par la force magnétique produite entre les parties formant pôle magnétique (7) et l'arbre tournant (3). Des cavités (9) sont formées sur la surface de l'arbre tournant. Au moins l'un des facteurs parmi la forme, les positions, et la quantité de cavités est ajusté de telle sorte qu'un courant de Foucault produit sur la surface de l'arbre tournant soit supprimé par la rotation de l'arbre tournant (3) et par un champ magnétique provoqué par les parties formant pôle magnétique (7).

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