A Second-Order Dual Mode Repetitive Control for Magnetically Suspended Rotor

Cui, Peiling; Zhang, Guoxi; Liu, Zhiyuan; Han, Bangcheng; Wang, Qirui

doi:10.1109/tie.2019.2927184

Cited by 16 publications

(5 citation statements)

References 27 publications

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“…As for the flat rotor with severe gyroscopic effect, the utilization of a PID controller in combination with a cross-feedback notch filter [29] or the state feedback combined with a disturbance observer [30] can be adopted to achieve unbalance vibration suppression in the full speed range with the consideration of coupling. Additionally, research studies have also been conducted on algorithms such as robust control [31], unbalance identification [32], and second-order repetitive control [33]. However, most of these approaches suffer from poor practicality and are challenging to implement in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Stability Assessment of the High-Speed Flywheel with AMBs on a Rotating Platform

Zhao,

Liu,

et al. 2024

Energies

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With the continuous improvement of the performance and capabilities of spacecrafts, the application of active magnetic bearings (AMBs) has become a major focus in current research. The AMBs-flywheel system is not only responsible for attitude control but also provides the required energy during shadow periods. In magnetically suspended single gimbal control moment gyroscope (SGCMG), self-excited vibration caused by high-speed rotor rotation significantly affects the stability of the AMB system. The research focus lies in magnetically supporting the flywheel at high speeds with low power consumption to explore gyroscopic mechanics at ultra-high speeds and assess the corresponding stability. This study presents an assessment of the stability performance of a high-speed flywheel equipped on a single gimbal with an angular momentum of 75 Nm. To achieve ultra-high-speed operation under low driving power, a high-precise dynamic balance was performed followed by a novel unbalance control strategy of a radial and axial automatic balancing algorithm to suppress effectively synchronous vibrations due to nutation and precession. Corresponding experiments including static stable suspension experiments as well as low-speed, high-speed, and series-based stability assessments were conducted. Stable suspension at any speed ranging from 0 to 30,000 r/min was successfully implemented. The stability performance of the high-speed flywheel on a rotating platform at different gimbal speeds was verified, with a maximum speed reaching 31,200 r/min. The entire output torque process within the range of 30,000 r/min was revealed.

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Section: Introductionmentioning

confidence: 99%

Stability Assessment of the High-Speed Flywheel with AMBs on a Rotating Platform

Zhao,

Liu,

et al. 2024

Energies

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“…However, these methods have a complicated structure and involve a lot of calculations, thus there are still some challenges in applying them to practical engineering. Cui et al [18] proposed a second-order dual-mode repetitive controller to address the drawbacks of the comparatively poor robustness and slow transient response of traditional repetitive controllers. This approach can effectively suppress the harmonic current vibrations of the AMB system.…”

Section: Introductionmentioning

confidence: 99%

Synchronous disturbance suppression of active magnetic bearing rotor systems using variable period adaptive control algorithm

Bian,

Shi,

Sun

et al. 2023

Meas. Sci. Technol.

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This paper aims to investigate the issue of suppressing synchronous vibration in active magnetic bearing (AMB) systems. The rotor mass imbalance is a challenging problem for the AMB system, which will cause synchronous vibration and severely aﬀect the system stability and safety. However, existing algorithms based on the iterative feed-forward control strategy ﬁnd it diﬃcult to simultaneously ensure system’s stability and competent convergence performance. They struggle to maintain tolerable robustness within the system operating bandwidth. This paper proposes a variable period adaptive control algorithm to address these challenges. The overall control scheme can achieve current and displacement elimination separately by switching control structures and is applicable to variable speed conditions. This algorithm can adaptively adjust the iteration period based on rotational speed to ensure both splendid convergence performance and system dynamic performance. Furthermore, this work employs the Lyapunov method to analyze the algorithm’s asymptotic stability and provides a lookup table for algorithm parameters. This could signiﬁcantly enhance the robustness and stability of the algorithm within the system operating bandwidth. Finally, this methodology has proven to be eﬀective and superior in simulations and experiments.

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“…However, the lubricating oil in the TMP can reduce the degree of vacuuming due to evaporation or leakage. Compared with traditional mechanical bearings, magnetic bearings have several significant advantages, such as no contact, no wear, no oil, higher rotational speed, and the controllability of bearing dynamics [4][5][6][7][8]. Therefore, active magnetic bearings (AMBs) are the best choice for ultra-high vacuum TMPs.…”

Section: Introductionmentioning

confidence: 99%

Field Dynamic Balancing for Magnetically Suspended Turbomolecular Pump

Chen

Li²

2023

Sensors

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A field dynamic balancer is crucial to the applications of magnetically suspended turbomolecular pumps. Therefore, this paper presents a novel field dynamic balancing method based on autocentering control mode without any additional instrumentation. Firstly, the dynamics of the active magnetic bearing rotor system with unbalance are modeled. Through model analysis, it was found that making the rotor rotate around the geometric axis can improve the accuracy of dynamic balancing. Secondly, the relationship between the correcting masses and the synchronous currents based on the influence coefficient method is established. Then, an autocentering controller is designed to make the rotor rotate around the geometric axis. The synchronous currents can be detected and extracted by the current transducers to calculate the unbalance correction mass. Finally, the experimental results show that this novel field dynamic balancing method can effectively eliminate the majority of rotor unbalance. Compared with the original unbalance of a rotor, the synchronous current in the A-end has been reduced by 71.4% and the synchronous current in the B-end, by 90.8% with the proposed method.

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A Second-Order Dual Mode Repetitive Control for Magnetically Suspended Rotor

Cited by 16 publications

References 27 publications

Stability Assessment of the High-Speed Flywheel with AMBs on a Rotating Platform

Stability Assessment of the High-Speed Flywheel with AMBs on a Rotating Platform

Synchronous disturbance suppression of active magnetic bearing rotor systems using variable period adaptive control algorithm

Field Dynamic Balancing for Magnetically Suspended Turbomolecular Pump

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