Patent ID: 6927550

Claim:
A compensation device for closed loop compensation of a synchronous disturbance in a rotating machine comprising a rotor magnetically suspended by at least one radial magnetic bearing comprising electromagnets driven by amplifiers, a radial detector device for sensing the axial position of the rotor, and a closed loop servocontrol circuit connected to said detector device and to said electromagnets and comprising a control circuit for controlling the energization of the electromagnets that supplies a control signal (u) to said amplifiers in response to signals supplied by the detector device to maintain the rotor in a predetermined axial position, which compensation device is characterized in that it comprises means for generating a signal for compensating the synchronous disturbance, said means being inserted into the servocontrol circuit ahead of the energization control circuit to minimize variation of the control signal in relation to the disturbance, and in that said compensation signal generator means comprise application means for applying at least one correction angle (θ) to ensure the stability of the closed loop, said at least one correction angle being determined as a function of the phase variation of the disturbance observed over a particular range of rotation speeds.