Active vibration control of rotor imbalance in active magnetic bearing systems

Fang, Jiancheng; Xu, Xiangbo; Xie, Jinjin

doi:10.1177/1077546313488792

Cited by 50 publications

(23 citation statements)

References 27 publications

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“…The MSFW with Vernier-gimballing ability is named as Vernier-gimballing MSFW, and the tested maximum torque introduced in this paper is up to 4.36Nm (Tang et al, 2017). As an actuator for the satellite attitude control in 3-DOFs, the principle of Vernier-gimballing MSFW to output torques is the same as that of the double flywheel or double gimbal variable speed control moment gyroscope (Fang et al, 2015; Peng et al, 2015), but the bandwidth of the Vernier-gimballing control of flywheel is 7.7Hz and is bigger than that of control moment gyroscope, which is generally 5Hz (Xu et al, 2015), so the Vernier-gimballing MSFW can respond to the command rapidly. Different from the control moment gyroscope, which needs gimbal driven by the motor to support high-speed rotor, the rotor in Vernier-gimballing MSFW controlled by MB can be tilted around each axis in the radial plane without any additional mechanical accessories, so the Vernier-gimballing MSFW has higher precision, less volume, less weight and less power consumption (Fang et al, 2010), and it is possible to decrease the number of the needed flywheels to control the attitude of spacecraft accordingly (Tang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Suppression of high-frequency disturbance to satellite by Vernier-gimballing magnetically suspended flywheel

Tang

Wang

Liu³

et al. 2018

Transactions of the Institute of Measurement and Control

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The high-frequency disturbance acting on a satellite decreases the satellite’s stability and pointing precision. The common flywheel is generally used to suppress it, but the number of the required flywheels is usually five or more and that will make the satellite overweight. The magnetically suspended flywheel (MSFW) with Vernier-gimballing capability (Vernier-gimballing MSFW) is proposed in this paper to suppress the high-frequency disturbance. In addition, a comparative simulation research has been done for a satellite controlled by Vernier-gimballing MSFW or reaction FW. It is worth noting that the Vernier-gimbaling MSFW can not only make the actual angle of the satellite track its reference angle better, but also make the accumulative errors of outer and inner virtual gimbal angle be very small, then the satellite’s stability and pointing precision will be improved accordingly. The Vernier-gimballing MSFW is verified to be able to suppress the high-frequency disturbance effectively when their frequencies are within the frequency bandwidth of MSFW.

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Section: Introductionmentioning

confidence: 99%

Suppression of high-frequency disturbance to satellite by Vernier-gimballing magnetically suspended flywheel

Tang

Wang

Liu³

et al. 2018

Transactions of the Institute of Measurement and Control

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“…In a maglev flywheel system, an unbalanced interference signal synchronous with the flywheel frequency would be produced because the flywheel rotor is uneven, which will give rise to unbalanced vibration response and affect the stored energy of the flywheel battery and restrict its application in electric vehicles and other areas . So, the signal should be filtered out to reduce the effects on the control system.…”

Section: Introductionmentioning

confidence: 99%

Research on switch compensation control for maglev flywheel battery

Gao

Cao

2018

IEEJ Transactions Elec Engng

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In a maglev flywheel system, an unbalanced interference signal synchronous with the flywheel frequency will be produced because the flywheel rotor is uneven. This signal can reduce system control precision and stability, and make the system produce unbalance force vibration. Therefore, the signal should be filtered to reduce the effects on the control system. A vibration switching compensation control strategy is proposed based on the standard least mean squares (LMS) algorithm and one proportional–integral–derivative (PID) controller. The flywheel's rotational frequency is measured in real time as the switching reference, and different LMS algorithm step sizes and different PID controller parameters are adopted in different rotational frequencies. Simulation and experimental results verify the feasibility and effectiveness of the switch compensation strategy, which can reduce the control current amplitude and make the flywheel rotate around the inertial principal axis as much as possible. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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“…In fact, precise control current should be generated to compensate the vibration caused by the displacement stiffness [ 20 ]. However, the precision of this approach mainly depends on the parameter accuracy of the controlled object [ 21 ], especially the voltage-source power amplifiers, whose performances vary greatly with many parameters, such as temperature and the inductance of the AMB coil [ 22 ]. The precision of rotation around the inertial axis will inevitably decrease due to the inaccurate control current caused by the errors and variations of the power amplifiers [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Field Balancing and Harmonic Vibration Suppression in Rigid AMB-Rotor Systems with Rotor Imbalances and Sensor Runout

2015

Sensors

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Harmonic vibrations of high-speed rotors in momentum exchange devices are primary disturbances for attitude control of spacecraft. Active magnetic bearings (AMBs), offering the ability to control the AMB-rotor dynamic behaviors, are preferred in high-precision and micro-vibration applications, such as high-solution Earth observation satellites. However, undesirable harmonic displacements, currents, and vibrations also occur in the AMB-rotor system owing to the mixed rotor imbalances and sensor runout. To compensate the rotor imbalances and to suppress the harmonic vibrations, two control methods are presented. Firstly, a four degrees-of-freedom AMB-rotor model with the static imbalance, dynamic imbalance, and the sensor runout are described. Next, a synchronous current reduction approach with a variable-phase notch feedback is proposed, so that the rotor imbalances can be identified on-line through the analysis of the synchronous displacement relationships of the geometric, inertial, and rotational axes of the rotor. Then, the identified rotor imbalances, which can be represented at two prescribed balancing planes of the rotor, are compensated by discrete add-on weights whose masses are calculated in the vector form. Finally, a repetitive control algorithm is utilized to suppress the residual harmonic vibrations. The proposed field balancing and harmonic vibration suppression strategies are verified by simulations and experiments performed on a control moment gyro test rig with a rigid AMB-rotor system. Compared with existing methods, the proposed strategies do not require trial weights or an accurate model of the AMB-rotor system. Moreover, the harmonic displacements, currents, and vibrations can be well-attenuated simultaneously.

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Active vibration control of rotor imbalance in active magnetic bearing systems

Cited by 50 publications

References 27 publications

Suppression of high-frequency disturbance to satellite by Vernier-gimballing magnetically suspended flywheel

Suppression of high-frequency disturbance to satellite by Vernier-gimballing magnetically suspended flywheel

Research on switch compensation control for maglev flywheel battery

Field Balancing and Harmonic Vibration Suppression in Rigid AMB-Rotor Systems with Rotor Imbalances and Sensor Runout

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