System for controlling at least one active magnetic bearing equipping a rotating machine comprising a rotor and a stator, and corresponding method

A control system for controlling an active magnetic bearing equipping a rotating machine comprising a rotor and a stator,

• the control system being provided with at least one means for measuring radial positions of the rotor with respect to the stator as a function of a signal from at least two position sensors, and at least two control loops of the active magnetic bearing as a function of the radial positions of the rotor, each of the at least two control loops of the active magnetic bearing being provided with at least one synchronous filter that is a function of a rotation speed of the rotor with respect to the stator, the control system further comprising:
• a means for determining the rotation speed of the rotor with respect to the stator, receiving as input measurements of radial position of the rotor from a measurement means, and as a function of the measurements of radial position of the rotor performed over a predetermined time while the rotation speed of the rotor is zero, the means for determining the rotation speed comprising an extended Kalman filter, wherein the extended Kalman filter is initialized by a state vector that is a function of the mean deviation of the radial position of the rotor at zero rotation speed and by a covariance matrix that is a function of the standard deviations of the radial positions of the rotor at zero rotation speed over the predetermined measurement time.

A control system for controlling a first active magnetic bearing equipping a rotating machine comprising a rotor and a stator,

• the control system being provided with at least one means for measuring radial positions of the rotor with respect to the stator as a function of a signal from at least two position sensors, and at least two control loops of the active magnetic bearing as a function of the radial positions of the rotor, each of the at least two control loops of the active magnetic bearing being provided with at least one synchronous filter that is a function of a rotation speed of the rotor with respect to the stator, the control system further comprising:
• a means for determining the rotation speed of the rotor with respect to the stator, the stator receiving as input measurements of radial position of the rotor from a measurement means, and as a function of measurements of radial position of the rotor performed over a predetermined time while the rotation speed of the rotor is zero, wherein, the rotating machine being provided with a second active magnetic bearing, the means for determining the rotation speed of the rotor receives as input, from a measurement means of the second active magnetic bearing, measurements of radial position of the rotor and measurements of radial position of the rotor performed over a predetermined time while the rotation speed of the rotor is zero, and wherein the means for determining the rotation speed of the rotor is configured to determine the rotation speed of the rotor as a function of the measurements received from the measurement means of the first active magnetic bearing and the second active magnetic bearing.

A method for controlling a first active magnetic bearing equipping a rotating machine comprising a rotor and a stator,

• the control method comprising at least one step of:
• measuring the radial position of the rotor with respect to the stator as a function of a signal from at least two position sensors,
• controlling the active magnetic bearing as a function of the radial position of the rotor, the step of controlling the magnetic bearing comprising at least one step of:
• synchronous filtering as a function of the rotation speed of the rotor,
• performing a measurement step determining the rotation speed of the rotor with respect to the stator as a function of the measurements, of radial position of the rotor and of radial angular position of the rotor performed over a predetermined time while the rotation speed of the rotor is zero,
• providing a second active magnetic bearing, the means for determining the rotation speed of the rotor receives as an input, from a measurement means of the second active magnetic bearing, measurements of radial position of the rotor and measurements of radial position of the rotor performed over a predetermined time while the rotation speed of the rotor is zero, and wherein the means for determining the rotation speed of the rotor is configured to determine the rotation speed of the rotor as a function of the measurements received from the measurement means of the first active magnetic bearing and the second active magnetic bearing.