Decoupled control of an active magnetic bearing system for a high gyroscopic rotor

Hutterer, Markus; Hofer, Matthias; Schrödl, Manfred

doi:10.1109/icmech.2015.7083976

Cited by 17 publications

(12 citation statements)

References 4 publications

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“…However, this high bandwidth will lead to very high gains and will affect the bending and blade resonance frequencies. To solve this problem, a speed-variant compensation can be developed according to [6,7]. Using the control law:…”

Section: Decoupling Using An Inverse Dynamic Approachmentioning

confidence: 99%

“…Another simplification for minimizing the controller effort is that only the stationary solution of the Riccati equation is used, which can be calculated offline. The Kalman filter can be split up in an observer for the tilting movement and an observer for the translation movement according to [6,7]. The estimated states are calculated as follows:…”

Section: Decoupling Using An Inverse Dynamic Approachmentioning

confidence: 99%

“…As a consequence, the tilting and translation modes cannot be treated independently from each other, and the gyroscopic effect couples the motions of the tilting movements. In [6][7][8], decoupling approaches are used based on the inverse dynamics to decouple the system and compensate the impact of the gyroscopic effect on the rigid body movement. In [9][10][11][12][13][14], modern control approaches, such as H∞ and µ-synthesis control theory, were used.…”

Section: Introductionmentioning

confidence: 99%

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Control of Active Magnetic Bearings in Turbomolecular Pumps for Rotors with Low Resonance Frequencies of the Blade Wheel

Hutterer

Schrödl

2017

Lubricants

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Rotors with high gyroscopic effects and low resonance frequencies caused by the blade wheel (blade frequencies) can lead to stabilization problems in the application field of turbomolecular pumps. If such a rotor is stabilized by active magnetic bearings, the control structure could be destabilized by the splitting up of the rigid body eigen-frequencies caused by the gyroscopic effect. The control structure of the magnetic bearings can also destabilize the eigen-modes caused by the blade wheel, if the gain of the control structure is too high in the range of the eigen-frequencies of the blade wheel. To deal with the problem of the gyroscopic effect, a decoupling and compensation method was developed based on the inverse dynamics of the rigid body rotor. The gain of the control structure in the range of the blade frequencies is decreased using a Kalman filter. To increase the damping of the system, the predicted states of the linear magnetic bearing model using a Kalman filter are applied instead of the sampled values of the sensors directly. For the decoupled structure, PID controllers are used for stabilization. The functionality of the control structure is verified by a measurement of the current and position signal using the Kalman states and the sensor values. The robustness and performance in the frequency range are verified using the sensitivity and compliance function.

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Section: Decoupling Using An Inverse Dynamic Approachmentioning

confidence: 99%

Section: Decoupling Using An Inverse Dynamic Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Control of Active Magnetic Bearings in Turbomolecular Pumps for Rotors with Low Resonance Frequencies of the Blade Wheel

Hutterer

Schrödl

2017

Lubricants

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“…The initial guess of the Kalman observer is chosen to be zero. How such a Kalman observer can be developed is shown in [6].…”

Section: Reduction Of the Gyroscopic Effectmentioning

confidence: 99%

“…Also the gyroscopic effect is able to be reduced significantly with this selfsensing unbalance method. In [3], [5] and [6] the gyroscopic effect is reduced by using a special parameter variant structure.…”

Section: Introductionmentioning

confidence: 99%

Selfsensing unbalance rejection and reduction of the gyroscopic effect for an active magnetic bearing system

Hutterer

Hofer

Schrödl

2015

2015 10th Asian Control Conference (ASCC)

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The unbalance of a magnetically levitated rotor causes synchronous oscillations in the current and position signals. This oscillations can lead to saturation of the magnetic actuator. To deal with that problem a selfsensing unbalance controller is developed to reduce the unbalance oscillations in the current signals. The selfsensing unbalance controller consists of two parts. The first part is the unbalance observer which has the task to detect the angular velocity and the angle of the synchronous unbalance information. The second part is the unbalance controller which uses the information of the unbalance observer to reject the unbalance oscillations in the current signal. For the unbalance controller a two modulation step Notch filter is used. The unbalance controller is not the only device which needs the angular velocity. With the angular velocity information also a parameter variant control path can be developed which has the task to reduce the gyroscopic effect. The last part of this paper deals with experimental results of the proposed control system which is implemented on an industrial magnetic bearing system.

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Pseudo-magnetic centre identification of an active magnetic bearing for sensorless drive control start-up

2017

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Decoupled control of an active magnetic bearing system for a high gyroscopic rotor

Cited by 17 publications

References 4 publications

Control of Active Magnetic Bearings in Turbomolecular Pumps for Rotors with Low Resonance Frequencies of the Blade Wheel

Control of Active Magnetic Bearings in Turbomolecular Pumps for Rotors with Low Resonance Frequencies of the Blade Wheel

Selfsensing unbalance rejection and reduction of the gyroscopic effect for an active magnetic bearing system

Pseudo-magnetic centre identification of an active magnetic bearing for sensorless drive control start-up

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