Electrodynamic magnetic bearing

F - Mech Eng,Light,Heat,Weapons – 16 – C

Patent

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Details

F16C 32/04 (2006.01) F16C 39/06 (2006.01)

Patent

CA 2278510

Device for magnetic suspension of a rotor (10, 20, 30) in relative rotational movement along a predetermined rotation symmetric path with respect to a stator (14, 24, 26, 34, 36). Rotor (10, 20, 30) comprises a rotational body (11, 21, 31) which essentially consists of an electrically conductive unmagnetic material. Fitted at the stator (14, 24, 26, 34, 36) is at least one magnetic means (12, 22, 25, 32, 35), which comprises at least one rotation symmetric magnet (12, 22, 25, 32, 35) concentric with the rotational axis. The magnetic means is disposed to give rise to a rotation symmetric magnetic field concentric with the rotational axis. When and only when the rotational body (11, 21, 31) tends to leave the predetermined path and rotate eccentric, the magnetic field generates induced eddy currents in the rotational body (11, 21, 31), said eddy currents give rise to restoring stabilising forces.

L'invention concerne un dispositif permettant la suspension magnétique d'un rotor (10, 20, 30) dans un mouvement de rotation par rapport à un stator (14, 24, 26, 34, 36) le long d'une trajectoire à symétrie de rotation déterminée. Le rotor (10, 20, 30) comprend un corps rotatif (11, 21, 31) constitué essentiellement d'un matériau non magnétique et électriquement conducteur. Le stator (14, 24, 26, 34, 36) est équipé d'au moins un moyen magnétique (12, 22, 25, 32, 35) comprenant au moins un aimant à symétrie de rotation (12, 22, 25, 32, 35) et concentrique avec l'axe de rotation. Ce moyen magnétique est placé de façon à produire un champ magnétique à symétrie de rotation et concentrique avec l'axe de rotation. Si et seulement si le corps rotatif (11, 21, 31) a tendance à quitter la trajectoire déterminée et pivote de façon excentrique, le champ magnétique génère des courants de Foucault induits dans le corps rotatif (11, 21, 31), ces courants de Foucault donnant naissance à des forces stabilisatrices de rappel.

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