Active magnetic bearing with automatic detection of the...

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

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F16C 39/06 (2006.01)

Patent

CA 2560620

An active magnetic bearing (100) with automatic detection of the position thereof, comprising antagonistic first and second electromagnets (120, 130) forming stators disposed on both sides of a ferromagnetic body (110) forming a rotor maintained in a contact-free manner between said electromagnets. The electromagnets (120, 130) each comprise a magnetic circuit (121; 131), essentially consisting of a first ferromagnetic material and defining a gap with the ferromagnetic body, in addition to an exciting field (122; 132) which is fed by a power amplifier whose input current is controlled according to the position of the ferromagnetic body in relation to the magnetic circuits of the electromagnets. The position of the ferromagnetic body (110) is measured from the inductance detected between the two electromagnets (120, 130) reacting to the simultaneous injection into the two antagonistic electromagnets of a sinusoidal current having a frequency which is higher than the bandwidth in a closed loop of the system. The magnetic circuit (121; 131) of each electro- magnet also comprises a portion (124; 134) in the vicinity of the exciting field coil (122; 132) using a second ferromagnetic material whose magnetic permeability is lower than that of the first material and whose electric resistivity is greater than that of the first material in order to promote the passing of high frequency magnetic fields generated in the bearing.

Palier magnétique actif (100) à auto-détection de position comprenant des premier et second électro-aimants antagonistes (120, 130) formant stators disposés de part et d'autre d'un corps ferromagnétique (110) formant rotor maintenu sans contact entre ces électro-aimants. Les électro-aimants (120, 130) comprennent chacun un circuit magnétique (121; 131), comprenant essentiellement un premier matériau ferromagnétique et définissant avec le corps ferromagnétique un entrefer, et une bobine d'excitation (122; 132) alimentée à partir d'un amplificateur de puissance dont le courant d'entrée est asservi en fonction de la position du corps ferromagnétique par rapport aux circuits magnétiques des électroaimants. La position du corps ferromagnétique (110) est mesurée à partir de l'inductance détectée entre les deux électro­aimants (120, 130) en réponse à l'injection simultanément dans les deux électro-aimants antagonistes d'un courant sinusoïdal ayant une fréquence supérieure à la bande passante en boucle fermée du système. Le circuit magnétique (121 ; 131) de chaque électro-aimant comprend en outre une portion (124 ; 134) au voisinage de la bobine d'excitation (122; 132) utilisant un second matériau ferromagnétique ayant une perméabilité magnétique inférieure à celle du premier matériau et une résistivité électrique supérieure à celle du premier matériau de manière à favoriser le passage des champs magnétiques hautes fréquences générés dans le palier.

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