Nonlinear Control Approach of an Electromagnetic Bearing System

Liu, Si Jia; Yang, Fan; Di, Jun; Liu, Ya Jing; Qin, Wei; Li, Shuo

doi:10.4028/www.scientific.net/amm.538.387

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…However, as to flexible rotors, given the uncertainty of parameters, the PID control capacity to resist significant unknown disturbances weakens [8]. Therefore, the improved PID controllers, such as H∞ controllers [9], µ controllers [10], sliding mode controllers [11], fuzzy control algorithms [12], genetic algorithms [13], neural network controllers [14], LQG controllers [15,16], etc., have gained widespread attentions.…”

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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“…The most common control system used to control the AMB system in rigid rotors is PID control (Proportional-Integral-Derivative control) [17,18,19]. Muminović et al, for flexible rotors, propose PI-D control.…”

Section: Introductionmentioning

confidence: 99%

The annulling of the sudden appearance of an unbalance in rotary machines by using active magnetic bearings

Tomović,

Damjanović,

Tomović

et al. 2023

Eng. rev. (Online)

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The application of magnetic bearings has become more frequent during the last 20 years and represents a significant aspect of improvements in the construction of machines with rotary motion. With the advancement of technology, the number of applications in which magnetic bearings have found their application is increasing. In this paper, it is shown how the effect of magnetic forces can annul the negative influence of unbalance, which suddenly appeared in a rotor supported in active magnetic bearings. Such cases may occur in operation due to breakage and rotor parts falling off (e.g., fan blades), which will lead to a sudden change in the mass balance of the rotor system and dislocation of the centre of mass in relation to the geometric centre of the rotor. In the paper, a mathematical model of the dynamic behaviour of a rigid rotor in active magnetic bearings was developed. The model is nonlinear and has five degrees of freedom and can only be solved numerically. The Newmark beta method and the Newton-Raphson method were used to solve the system of nonlinear differential equations. The results of the simulation showed the advantages of using active magnetic bearings for annulling sudden occurrences of unbalance in rotary machines.

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“…respectively, Z2pi and Z2pj are peak values of regions chosen on the radiation concave surface in the axial direction and circumferential direction, respectively, and m and n are numbers of wave peaks in the axial direction and circumferential direction, respectively. Based on the above analysis, the radical levitation force of the ultrasonic bearing excited by each transducer can be calculated by Equation (8) which is as follows:…”

Section: Modeling Of Radical Radiation Forcementioning

confidence: 99%

“…With regard to electromagnetic-suspension bearings, demagnetization and magnetic leakage will affect their performance. Besides, a complicated control system is needed to guarantee their high precision and stability [8]. Hence, improvement of existing bearing technology and development of novel bearing concepts are of great significance.…”

Section: Introductionmentioning

confidence: 99%

A Novel Noncontact Ultrasonic Levitating Bearing Excited by Piezoelectric Ceramics

Quan

Deng

et al. 2016

Applied Sciences

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A novel ultrasonic levitating bearing excited by three piezoelectric transducers is presented in this work. The transducers are circumferentially equispaced in a housing, with their center lines going through the rotation center of a spindle. This noncontact bearing has the ability to self-align and carry radical and axial loads simultaneously. A finite element model of the bearing is built in ANSYS, and modal analysis and harmonious response analysis are conducted to investigate its characteristics and driving parameters. Based on nonlinear acoustic theory and a thermodynamic theory of ideal gas, the radical and lateral load-carrying models are built to predict the bearing's carrying capacity. In order to validate the bearing's levitation force, a test system is established and levitating experiments are conducted. The experimental data match well with the theoretical results. The experiments reveal that the maximum radical and axial levitating loads of the proposed bearing are about 15 N and 6 N, respectively, when the piezoelectric transducers operate at a working frequency of 16.11 kHz and a voltage of 150 V p-p .

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Nonlinear Control Approach of an Electromagnetic Bearing System

Cited by 4 publications

References 7 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

The annulling of the sudden appearance of an unbalance in rotary machines by using active magnetic bearings

A Novel Noncontact Ultrasonic Levitating Bearing Excited by Piezoelectric Ceramics

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