Abstract
The rotor of a magnetically levitated shaft is not perfect. The axis of inertia and the geometrical axis are not identical. When this rotor turns with a velocity ø, the radial acceleration which perturbs the movement of the rotor is proportional to the square of ø. In order to reduce the power level which is necessary to maintain the rotor in a levitated position, it becomes interesting to rotate the rotor around the axis of intertia; but the position of this axis is unknown. In order to control the Active Magnetic Bearings (AMB) of the shaft, a method to compute an image of this disturbance is proposed. The obtained non linear control law allows to turn around the geometrical axis just as well the axis of inertia. Simulations and experiments illustrate the efficiency of this control law.
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