Abstract: The system for stabilizing a support comprises a working rotor mounted on the support by frictionless bearings and fixed to a working member for which at least one parameter associated with the rotation of the working rotor is variable as a function of time. A nested reaction rotor is mounted concentrically relative to the working rotor by frictionless bearings such as magnetic bearings or gas bearings and it supports a reaction inertia member. A single servo-controlled electric motor is interposed between the working rotor and the reaction rotor in order to drive the working rotor and the reaction rotor in opposite directions in such a manner that the torque disturbances generated on the support by the motion of the working rotor are cancelled by the simultaneous reaction motion of the reaction rotor, with the ratio of the speeds of the working rotor and the reaction rotor being such that the total angular momentum of the working rotor and of the reaction rotor is kept equal to zero.

Abstract: The system for stabilizing a support to be stabilized comprises a working rotor mounted on the support via bearings and fixed to a working member having at least one parameter associated with the rotation of the working rotor and which is variable as a function of time. A servo-controlled first electric motor is interposed between the support and the working rotor and serves to rotate the working rotor in a first direction. A reaction rotor is mounted on the support by means of bearings and independently from the working rotor, while being coaxial therewith.

Abstract: The mechanical stabilization system for a support comprises a working rotor mounted on the support by means of bearings and fixed to a working member having at least one parameter associated with the rotation of the working member and which is variable as a function of time. A reaction rotor is concentric with the working rotor and is mounted on the working rotor by means of bearings and is fixed to a reaction inertia member. A first servo-controlled electric motor is interposed between the working rotor and the reaction rotor and serves to drive the working rotor and the reaction rotor in opposite directions of rotation. A low power second electric motor is interposed between the working rotor and the support and is servo-controlled in such a manner as to reposition the reaction rotor and correct for drift in the correcting motion of the reaction rotor, due in particular to friction in the bearings.