Unbalance Compensation by Recursive Seeking Unbalance Mass Position in Active Magnetic Bearing-Rotor System

Kejian, Jiang; Zhu, Changsheng; Chen, Liangliang

doi:10.1109/tie.2015.2405893

Cited by 87 publications

(40 citation statements)

References 13 publications

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“…According to (12), (13), (19) and (20), the maximum force will be generated when the displacement in the radial and axial directions is zero, that is the rotor is at the equilibrium position. The coefficient β can be obtained as setting β ≈ 0.96 because of the leakage flux of the PM ring in the air gap and through the FEA.…”

Section: Magnetic Flux Density In the Air Gapmentioning

confidence: 99%

“…The wind turbines supported by magnetic bearings have many advantages, which include the following: (a) the utilization rate of wind energy will be improved and the threshold wind speed will be reduced because no contact and friction between the stator and the rotor will occur; (b) the costs, environmental pollution and loss will be reduced because no lubrication is present in the magnetic bearings; and (c) magnetic bearings have high adaptability to extreme climate conditions [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines

Zhang

Sun

et al. 2016

Energies

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This paper proposes a five-degree-of-freedom (5-DOF) hybrid magnetic bearing (HMB) for direct-drive wind turbines, which can realize suspension in the 4-DOF radial and 1-DOF axial directions. Only two sets of radial control windings are employed in the proposed HMB because only one set of radial control windings can achieve the 2-DOF suspension in the radial direction. Unlike the traditional active thrust magnetic bearings, this paper uses a cylindrical rotor core without a large thrust disc in the novel HMB. The numbers of the controller, power amplifier and system volume can be reduced in the magnetic suspension system. This paper also presents the structure and basic characteristics of the proposed magnetic bearing. A precision equivalent magnetic circuit analysis of the permanent magnet ring and control magnetic field is conducted in this study, in consideration of the non-uniform distribution of magnetic density. Accordingly, the mathematical models, including the suspension force expression, are derived based on the accurate equivalent magnetic circuit. The basic principle of the structure parameter design is presented, based on the given key parameters. The accuracy of the analytical method is further validated by 3D finite element analysis.

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Section: Magnetic Flux Density In the Air Gapmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines

Zhang

Sun

et al. 2016

Energies

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“…Until now, there are lots of research results on the AMB rotor unbalance control. From the literature research works, [8][9][10][11][12][13][14] AMB rotor unbalance control methods were divided into unbalance compensation and automatic balance. The unbalance compensation is a method that can control the rotor spins around its geometric axis via compensating periodic signal, and the automatic balance is a method that can control the rotor spins around its inertia axis via ignoring periodic signal.…”

Section: Introductionmentioning

confidence: 99%

“…The unbalance compensation is a method that can control the rotor spins around its geometric axis via compensating periodic signal, and the automatic balance is a method that can control the rotor spins around its inertia axis via ignoring periodic signal. The former is suitable for high-precision applications 8,11 and the latter is suitable for high-speed applications. 12,14 However, RPV is not only caused by the problems stated above, but also a large number of non-periodic disturbances existing in the operational process of AMB system.…”

Section: Introductionmentioning

confidence: 99%

A novel iterative learning control method and control system design for active magnetic bearing rotor imbalance of primary helium circulator in high-temperature gas-cooled reactor

Zheng

Liu

Zhao

et al. 2020

Measurement and Control

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As one of the key technologies of high-temperature gas-cooled reactor, primary helium circulator–equipped active magnetic bearing provides driving force for primary helium cooling system. However, repetitive periodic vibration produced by rotor imbalance may introduce risks to primary helium circulator (even for high-temperature gas-cooled reactors). First, this article analyzes a periodic component extraction algorithm which is widely used in active magnetic bearing rotor unbalance control methods and points out the problem that the periodic component extraction algorithm occupies numerous computing resources which cannot satisfy the real-time request of active magnetic bearing control system. Then, a novel iterative learning control algorithm based on the iteration before last iteration of system information (iterative learning control-2) and a plug-in parallel control mechanism based on the existing control system are put forward, meanwhile, an integrated independent distributed active magnetic bearing control system is designed to solve the problem. Finally, both the simulation and experiment are carried out, respectively. The corresponding results show that the control method and control system proposed in this article have significant suppression effect on the repetitive periodic vibration of the active magnetic bearing system without degrading the real-time requirement and can provide important technical support for the safe and stable operation of the primary helium circulator in high-temperature gas-cooled reactor.

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“…is method was effective regardless of the loop frequency response. An LMS adaptive filter [18] was proposed to achieve imbalance compensation in a hard-disk system. Compared to the notch filter method, LMS adaptive filter offered the advantage of tuning parameters directly.…”

Section: Introductionmentioning

confidence: 99%

Vibration Torque Suppression for Magnetically Suspended Flywheel Using Improved Synchronous Rotating Frame Transformation

Peng

Cai

Deng

et al. 2019

Shock and Vibration

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Synchronous vibration, a common issue in active magnetic bearing (AMB) system, is mainly caused by mass imbalance of the rotor. It comes with high-power consumption and serious impact on the housing base, dramatically degrading the performance of AMB. Magnetically suspended flywheel (MSFW), which owns a flat rotor and consequently shows strong gyroscopic effects even at low operating speed, requires additional attention not only for suppressing the synchronous vibration but also for maintaining the overall stability faced with the coupled dynamics. In this work, in order to suppress the vibration torques in MSFW with significant gyroscopic effects, an improved synchronous rotating frame- (SRF-) based control method is proposed. The proposed method introduces the compensation phase for stability adjustment and aims at simultaneously suppressing the synchronous components in the coupled axes. Firstly, the vibration torque model of MSFW is established, and the baseline control strategy for suspension and gyroscopic effects restrain is derived. Then, the principle and implementation of the improved SRF-based vibration torque method are analyzed, which aims at suppressing the synchronous vibration torques through attenuating synchronous components in coil currents. Moreover, the stability of the overall closed-loop system is analyzed. Finally, the effectiveness of the proposed method is verified through simulation and experimental results.

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Unbalance Compensation by Recursive Seeking Unbalance Mass Position in Active Magnetic Bearing-Rotor System

Cited by 87 publications

References 13 publications

Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines

Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines

A novel iterative learning control method and control system design for active magnetic bearing rotor imbalance of primary helium circulator in high-temperature gas-cooled reactor

Vibration Torque Suppression for Magnetically Suspended Flywheel Using Improved Synchronous Rotating Frame Transformation

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