Societe De Mecanique Magnetique

Skf Magnetic Mechatronics

Armand Lapierre

Luc Baudelocque

Maurice L Brunet

Michel Lacour

The device for magnetically suspending a rotor relative to a structure comprises at least one axial active magnetic bearing with a main electromagnet coil disposed in a stator and having load-bearing surfaces placed facing an armature extending essentially perpendicularly to the axis of the rotor. A device for detecting the axial position of the rotor is associated with circuits for servo-controlling the current carried by the main electromagnet coil. A compensation coil is disposed close to the main electromagnet coil, but in a position that is situated away from the load-bearing surfaces of the stator that co-operate with the rotor armature. The compensation coil is connected in series with the main electromagnet coil, but carries current in the opposite direction to that carried by said main electromagnet coil. The device constitutes an axial abutment of optimized capacity without magnetic leakage.

Device for magnetically suspending a rotor

The jacketed active magnetic bearing is applied to a rotary machine having a rotor in contact with a process gas and placed in a leaktight enclosure. The magnetic stator is protected by a first jacket of magnetic anti-corrosion material that constitutes a portion of the leaktight enclosure and that is secured to the bearing stator, and the detector stator is protected by a second jacket of non-magnetic anti-corrosion material that constitutes a portion of the leaktight enclosure and that is secured to the detector stator. The bearing armature and the detector armature can be made of a laminated magnetic identical to that of the first jacket.

Jacketed active magnetic bearing

The emergency bearing for a rotary machine having magnetic bearings comprises an emergency landing device including an intermediate element () having a large contact area with a stator element (), the intermediate element () being interposed between a bearing member () and the stator element () fixed to the stator () with radial clearance () relative to said stator element (). A damper element () acting in the radial direction is interposed between the intermediate element () and the stator element (), and a contact element () having very low friction is implemented between the intermediate element () and the stator element () to reduce friction during rotary movements between these two elements.

Growing community of inventors

Fontaine sous Jouy, France

Armand Lapierre