Control of active magnetic bearing systems with input delay for applications in remotely controlled turbomachinery

Anantachaisilp, Parinya; Di, Long; Yoon, Se Young; Lin, Zongli

doi:10.1109/cdc.2014.7039544

Cited by 3 publications

(4 citation statements)

References 16 publications

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“…A stabilizing truncated predictor feedback (TPF) control law for linear systems with input delay was derived in [30] to maximize the tolerable delay bound. In particular, this control law was experimentally validated on a test rig that was built to closely represent AMB systems in industrial machines.…”

Section: Output Regulation By State Feedbackmentioning

confidence: 99%

“…The proof of Lemma 2 and a numerical method for solving the nonlinear matrix inequality conditions (9) can be found in [11] and [30]. Finally, the combined results of Lemmas 1 and 2 provide us with a solution to the state feedback output regulation problem.…”

Section: Output Regulation By State Feedbackmentioning

confidence: 99%

“…Observer) levitation controller satisfying the stability conditions in Lemma 2 was previously studied in [30], and experiments demonstrated that the control law can stabilize the undisturbed AMB system for delays up to ten times the sampling time of the digital controller (0.83 ms). The maximum and minimum singular values of the resulting output feedback control law is shown in Fig.…”

Section: Augmented)mentioning

confidence: 99%

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Unbalance compensation for AMB systems with input delay: An output regulation approach

Yoon

Lin

2016

Control Engineering Practice

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Unbalance compensation is an important technique for reducing rotor vibration in high speed rotating machines caused by residual rotor unbalance. As rotating machines in remote applications aim for higher speeds to gain efficiency and to reduce footprint, there is a need to extend the unbalance compensation techniques to active magnetic bearing (AMB) systems with delays in the control loop. This paper investigates the unbalance compensation problem for AMB systems with input delays. An unbalance compensation method is developed based on a solution to the output regulator problem for systems with input delay. The proposed unbalance compensation method is verified through simulation, and experimentally validated on an AMB test rig.

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Section: Output Regulation By State Feedbackmentioning

confidence: 99%

Section: Output Regulation By State Feedbackmentioning

confidence: 99%

Section: Augmented)mentioning

confidence: 99%

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Unbalance compensation for AMB systems with input delay: An output regulation approach

Yoon

Lin

2016

Control Engineering Practice

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“…A linear matrix inequality (LMI) method is used to derive the TPF control law that satisfies the stability conditions (4.9) for the maximum delay boundD [59]. Given that the conditions …”

Section: Maximization Of the Delay Boundmentioning

confidence: 99%

Unbalance Compensation of AMB Systems with Input Delay: A Truncated Predictor Feedback Based Output Regulation Approach

Long

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Active magnetic bearings (AMBs) adopt electromagnetic forces to support the rotating shaft and do not have physical contact with the rotary structure. Compared to conventional mechanical bearings, AMBs do not require lubrication; the non-contact working environment improves the e ciency and reduces maintenance cost caused by mechanical wear; the dynamic forces also help the machinery to achieve higher rotational speeds. These appealing features of AMBs have gradually expanded their application in di↵erent industries, especially those involving high speed rotating machineries, such as compressors, where e ciency and reliability are highly desired.Emerging applications in o↵shore drilling for oil and gas production require compressors to operate in a remote and harsh environment for long periods of time. By adopting AMB technologies, these remotely operated applications have become technically and economically more feasible. Motivated by the challenges in those applications, this dissertation first addresses controlling high speed compressors supported by AMBs in o↵shore oil and gas development, where the control and sensor measurement signals are transmitted through long cables between the control unit on the shore and the compressor on the seabed. These cables, which may extend for several kilometers, introduce significant time delays to the system and the delays can degrade the system performance and even cause instability. Therefore, control methods that e↵ectively contain the delay e↵ect become indispensable. In this dissertation, the truncated predictor feedback (TPF) control law is applied to handle the time delay. The TPF control method utilizes the prediction of future states in the control signal calculation ii iii to eliminate the delay e↵ect. The controller corresponding to the maximized input delay that the closed-loop system can tolerate is obtained iteratively from the solution of a linear matrix inequality (LMI) problem. It is demonstrated in the dissertation that the TPF controller can tolerate a significant amount of input delay for AMB system levitation and outperforms a properly designed µ-synthesis robust controller.The second topic of this dissertation is unbalance compensation of AMB systems at both constant and time-varying rotational speeds. Any rotating machines are subject to disturbance forces caused by residual unbalance and the disturbance force is synchronous to the rotational speed. Therefore, unbalance compensation is crucial for reducing rotor vibration and preserving the system stability in high speed rotating machines. A properly controlled compressor supported by AMBs needs to confine the vibration to a small level to satisfy industrial standards. To mitigate the adverse e↵ects of unbalance forces, this dissertation proposes a novel unbalance compensation technique based on the output regulation mechanism.The problem of output regulation is to design a controller for disturbance rejection and/or reference tracking, while the disturbance or reference signal is generated ...

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An output regulation approach to rotor autobalancing in active magnetic bearing systems with input delay

Yoon

Lin

2016

2016 IEEE International Conference on Advanced Intelligent Mechatronics (AIM)

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Control of active magnetic bearing systems with input delay for applications in remotely controlled turbomachinery

Cited by 3 publications

References 16 publications

Unbalance compensation for AMB systems with input delay: An output regulation approach

Unbalance compensation for AMB systems with input delay: An output regulation approach

Unbalance Compensation of AMB Systems with Input Delay: A Truncated Predictor Feedback Based Output Regulation Approach

An output regulation approach to rotor autobalancing in active magnetic bearing systems with input delay

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