Journal articles: 'Active magnetic bearing system'

1

Owusu-Ansah, Prince, Yefa Hu, and Rhoda Afriyie Mensah. "Active Magnetic Bearing as a Force Measurement System." International Journal of Materials, Mechanics and Manufacturing 5, no. 3 (August 2017): 209–12. http://dx.doi.org/10.18178/ijmmm.2017.5.3.320.

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Ma, Zhihao, Gai Liu, Yichen Liu, Zhaocheng Yang, and Huangqiu Zhu. "Research of a Six-Pole Active Magnetic Bearing System Based on a Fuzzy Active Controller." Electronics 11, no. 11 (May 29, 2022): 1723. http://dx.doi.org/10.3390/electronics11111723.

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Magnetic bearings have a series of excellent qualities, such as no friction and abrasions, high speed, high accuracy, and so on, which have fundamentally innovated traditional forms of support. In order to solve the problems of the large volume, low power density and high coupling coefficient of three-pole magnetic bearings, a six-pole AC active magnetic bearing is designed. Firstly, the basic structure and working principle of a two-degree-of-freedom (2-DOF) six-pole active magnetic bearing is introduced. Secondly, a suspension force modeling method of a 2-DOF AC active magnetic bearing based on the Maxwell tensor method is proposed, and the mathematical model of active magnetic bearing is established. Considering the fact that AC active magnetic bearing is essentially a nonlinear system, a fuzzy active disturbance rejection control (ADRC) method is designed based on fuzzy control and ADRC theory. Its control algorithm and control block diagram are given, and the fuzzy ADRC method is simulated and verified. Finally, the control block diagram of an experimental system based on the 2-DOF six-pole active magnetic bearing is given, and the experimental platform is constructed. The experimental results show that the mechanical and magnetic circuit structure of the 2-DOF six-pole active magnetic bearing is reasonable, and the fuzzy controllers can realize the stable suspension of the rotor.

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Kertész, Milan, Radko Kozakovič, Luboš Magdolen, and Michal Masaryk. "Active Displacement Control of Active Magnetic Bearing System." Scientific Proceedings Faculty of Mechanical Engineering 22, no. 1 (December 1, 2014): 32–37. http://dx.doi.org/10.2478/stu-2014-0006.

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AbstractThe worldwide energy production nowadays is over 3400 GW while storage systems have a capacity of only 90 GW [1]. There is a good solution for additional storage capacity in flywheel energy storage systems (FES). The main advantage of FES is its relatively high efficiency especially with using the active magnetic bearing system. Therefore there exist good reasons for appropriate simulations and for creating a suitable magneto-structural control system. The magnetic bearing, including actuation, is simulated in the ANSYS parametric design language (APDL). APDL is used to create the loops of transient simulations where boundary conditions (BC) are updated based upon a “gap sensor” which controls the nodal position values of the centroid of the shaft and the current density inputs onto the copper windings.

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Zong, Ming, Xiao Kang Wang, and Yang Cao. "Permanent Magnet Biased Bearing of Suspension System." Advanced Materials Research 383-390 (November 2011): 5529–35. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5529.

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PM (Permanent Magnet) biased magnetic bearing with PM to replace the magnetic field produced by electromagnet an Active Magnetic Bearing generated static bias magnetic field, it can reduce the power consumption of power amplifier to reduce the number of turns of magnet safety, reduce the volume of magnetic bearings, reducing electromagnetic coil operating current, thereby reducing the power amplifier power control system and heat sink size, magnetic bearings significantly reduce power loss, and fundamentally reduce the cost of bearing. In this paper, a kind of PM biased magnetic bearings, describes its structure and working principle, derived a mathematical model of magnetic bearing and magnetic circuit of PM biased magnetic bearings are calculated, given the specific PM biased magnetic bearing size and accordingly calculate the parameters of magnetic bearings. A magnetic model constructed using Simulink simulation method, and constructed using this method, magnetic bearing specific mathematical model simulation results show that the rotor position in the balance, X and Y decoupling between the control winding, while the deviation from equilibrium position time, X and Y control coupling between the windings, the simulation results and the calculation results.

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5

Cheng, Baixin, Xin Cheng, Shao Song, Huachun Wu, Yefa Hu, Rougang Zhou, and Shuai Deng. "Active Disturbance Rejection Control in Magnetic Bearing Rotor Systems with Redundant Structures." Sensors 22, no. 8 (April 14, 2022): 3012. http://dx.doi.org/10.3390/s22083012.

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At present, magnetic bearings are a better energy-saving choice than mechanical bearings in industrial applications. However, there are strongly coupled characteristics in magnetic bearing–rotor systems with redundant structures, and uncertain disturbances in the electrical system as well as external disturbances, and these unfavorable factors degrade the performance of the system. To improve the anti-interference performance of magnetic bearing systems, this paper proposes the inverse of the current distribution matrix W−1 meaning that the active disturbance rejection control simulation model can be carried out without neglecting the current of each coil. Firstly, based on the working mechanism of magnetic bearings with redundant structures and the nonlinear electromagnetic force model, the current and displacement stiffness models of magnetic bearings are established, and a dynamic model of the rotor is constructed. Then, according to the dynamic model of the rotor and the mapping relationship between the current of each coil and the electromagnetic force of the magnetic bearing, we established the equivalent control loop of the magnetic bearing–rotor system with redundant structures. Finally, on the basis of the active disturbance rejection control (ADRC) strategy, we designed a linear active disturbance rejection controller (LADRC) for magnetic bearings with redundant structures under the condition of no coil failure, and a corresponding simulation was carried out. The results demonstrate that compared to PID+current distribution control strategy, the LADRC+current distribution control strategy proposed in this paper is able to effectively improve the anti-interference performance of the rotors supported by magnetic bearings with redundant structures.

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Xie, Zhen Yu, Hong Kai Zhou, and Xiao Wang. "Effects of the Magnetic Damper Locations on Dynamic Characteristics of the Active Magnetic Bearing System in Manufacturing Engineering." Applied Mechanics and Materials 252 (December 2012): 51–55. http://dx.doi.org/10.4028/www.scientific.net/amm.252.51.

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The magnetic damper was introduced into the high speed rotating machinery to restrain the vibration of the rotor supported by active magnetic bearings. The experimental setup, which was made up of one rotor, two radial active magnetic bearings, one axial active magnetic bearing, one magnetic damper and control system, was built to investigate the effects of the magnetic damper locations on dynamic characteristics of the system by theoretical analysis, experimental modal analysis and actual operation of the system. The results show that the vibration of the active magnetic bearing system operating at the modal frequency can be reduced more effectively if the magnetic damper is located far from the nodes of the corresponding mode shape.

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7

Cho, Young Man, Sriram Srinavasan, Jae-Hyuk Oh, and Hwa Soo Kim. "Modelling and system identification of active magnetic bearing systems." Mathematical and Computer Modelling of Dynamical Systems 13, no. 2 (April 2007): 125–42. http://dx.doi.org/10.1080/13873950600605250.

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8

Kurnyta-Mazurek, Paulina, Artur Kurnyta, and Maciej Henzel. "Measurement System of a Magnetic Suspension System for a Jet Engine Rotor." Sensors 20, no. 3 (February 6, 2020): 862. http://dx.doi.org/10.3390/s20030862.

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This paper presents laboratory results on the measurement system of a magnetic suspension bearing system for a jet engine rotor of an unmanned aerial vehicle (UAV). Magnetic suspension technology enables continuous diagnostics of a rotary machine and eliminates of the negative properties of classical bearings. This rotor-bearing system consists of two radial magnetic bearings and one axial (thrust) magnetic bearing. The concept of the bearing system with a magnetically suspended rotor for UAV is presented in this paper. Rotor geometric and inertial characteristics were assumed according to the parameters of a TS-21 jet engine. Preliminary studies of the measurement system of rotor engines were made on a laboratory stand with homopolar active magnetic bearings. The measurement system consisted of strain gauges, accelerometers, and contactless proximity sensors. During the research, strains were registered with the use of a wireless data acquisition (DAQ) system. Measurements were performed for different operational parameters of rotational rotor speed, control system parameters, and with the presence of disturbance signals from the control system. In this paper, obtained operational characteristics are presented and discussed.

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9

Lee, Chong-Won, Young-Ho Ha, Chee-Young Joh, and Cheol-Soon Kim. "In-Situ Identification of Active Magnetic Bearing System Using Directional Frequency Response Functions." Journal of Dynamic Systems, Measurement, and Control 118, no. 3 (September 1, 1996): 586–92. http://dx.doi.org/10.1115/1.2801184.

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Complex modal testing is employed to obtain the directional frequency responses of a four-axis active magnetic bearing system. In the test, magnetic bearings are used as exciters while the system is in operation. The directional frequency response estimates are then used to effectively identify the parameters of the active magnetic bearing system. Experimental results show that the directional frequency response function, which is properly defined in the complex domain, is a powerful tool for identification of bearing as well as modal parameters of the system.

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10

GAHLER, Conrad, Manuel MOHLER, and Raoul HERZOG. "Magnetic Bearing. Multivariable Identification of Active Magnetic Bearing Systems." JSME International Journal Series C 40, no. 4 (1997): 584–92. http://dx.doi.org/10.1299/jsmec.40.584.

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11

Wang, Dongxiong, Nianxian Wang, and Kuisheng Chen. "Unbalance response of a magnetic suspended dual-rotor system." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 15 (June 24, 2019): 5758–72. http://dx.doi.org/10.1177/0954410019858011.

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The magnetic suspended dual-rotor system applied in more electric aero-engine can eliminate the wear and lubrication system of mechanical bearings and solve the vibration control issue of system effectively, which provides the possibility to improve the performance of aero-engine significantly. This research focuses on the unbalance response of the magnetic suspended dual-rotor system. First, a structure of dual-rotor system supported by two active magnetic bearings and two permanent magnetic bearings is presented. With proportional derivative (PD) control adopted, the bearing characteristics of active magnetic bearings are modeled as the equivalent stiffness and equivalent damping, and the permanent magnetic bearings are modeled as elastic support. Then, the Riccati transfer matrix method with good numerical stability is used to establish the model of the magnetic suspended dual-rotor system unbalance response. Subsequently, the validity of the present formulation has been tested against some known results available in literature and the simulation results obtained by finite element method (FEM). Finally, the dynamic characteristics of the unbalance response are investigated. The results reveal that the influence of the inner rotor imbalance excitation on the magnetic suspended dual-rotor system unbalance response is much larger than that of the outer rotor imbalance excitation. In addition, the critical speeds increase with the proportional coefficient, and the derivative coefficient can affect the amplitudes of the unbalance response, but not critical speeds. From the perspectives of the maximum bearing capacity and maximum displacement of active magnetic bearing-rotor system, the possibility of the magnetic suspended dual-rotor system safely crossing the critical speeds of the first three orders is investigated.

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12

Nguyen, Danh Huy, The Tai Ta, Le Minh Vu, Van Trong Dang, Danh Giang Nguyen, Duc Thinh Le, Duy Dinh Nguyen, and Tung Lam Nguyen. "Fractional Order Active Disturbance Rejection Control for Canned Motor Conical Active Magnetic Bearing-Supported Pumps." Inventions 8, no. 1 (January 9, 2023): 15. http://dx.doi.org/10.3390/inventions8010015.

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Active magnetic bearings (AMBs) are electromagnetic mechanism systems in which non-contact bearings support a rotating shaft using attractive forces generated by electromagnets through closed-loop control. For complete support of a five degree of freedom (DOF) rotor system, most AMB structures include two radial actuators and one for the axial direction. Conical active magnetic bearings (CAMBs) is one of the development directions of conventional magnetic bearings in which the requirement of the axial bearing can be eliminated. In this paper, we propose a structure with a CAMB integrated into a canned motor pump to eliminate the need for mechanical bearings and shaft seals. However, this system necessitates a more complicated control strategy due to a significant coupling effect between rotor motion and hydrodynamic disturbances. This paper presents a fractional order active disturbance rejection control (FOADRC) including a fractional order extend state observer (FOESO) and a proportional derivative controller (PD) to track and reject lumped disturbances actively. The proposed controller achieves better performance than the integer-type ADRC and traditional PID controller. The control performance of the proposed FOADRC is illustrated in terms of very good disturbance rejection capability that is demonstrated through MATLAB/Simulink simulation results.

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13

Ho, Y. S., H. Liu, and L. Yu. "Effect of Thrust Magnetic Bearing on Stability and Bifurcation of a Flexible Rotor Active Magnetic Bearing System." Journal of Vibration and Acoustics 125, no. 3 (June 18, 2003): 307–16. http://dx.doi.org/10.1115/1.1570448.

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This paper is concerned with the effect of a thrust active magnetic bearing (TAMB) on the stability and bifurcation of an active magnetic bearing rotor system (AMBRS). The shaft is flexible and modeled by using the finite element method that can take the effects of inertia and shear into consideration. The model is reduced by a component mode synthesis method, which can conveniently account for nonlinear magnetic forces and moments of the bearing. Then the system equations are obtained by combining the equations of the reduced mechanical system and the equations of the decentralized PID controllers. This study focuses on the influence of nonlinearities on the stability and bifurcation of T periodic motion of the AMBRS subjected to the influences of both journal and thrust active magnetic bearings and mass eccentricity simultaneously. In the stability analysis, only periodic motion is investigated. The periodic motions and their stability margins are obtained by using shooting method and path-following technique. The local stability and bifurcation behaviors of periodic motions are obtained by using Floquet theory. The results indicate that the TAMB and mass eccentricity have great influence on nonlinear stability and bifurcation of the T periodic motion of system, cause the spillover of system nonlinear dynamics and degradation of stability and bifurcation of T periodic motion. Therefore, sufficient attention should be paid to these factors in the analysis and design of a flexible rotor system equipped with both journal and thrust magnetic bearings in order to ensure system reliability.

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14

Kim, Cheol-Soon, and Chong-Won Lee. "Isotropic Optimal Control of Active Magnetic Bearing System." Journal of Dynamic Systems, Measurement, and Control 118, no. 4 (December 1, 1996): 721–26. http://dx.doi.org/10.1115/1.2802348.

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As a new rotor control scheme, isotropic control of weakly anisotropic rotor bearing system in complex state space is proposed, which utilizes the concepts on the eigenstructure of the isotropic rotor system. Advantages of the scheme are that the controlled system always retains isotropic eigenstructure, leading to circular whirling due to unbalance and that it is efficient for control of unbalance response. And the system analysis and controller design becomes simple and yet comprehensive since the order of the matrices treated in the complex domain approach is half of that in the real approach. The control scheme is applied to a rigid rotor-active magnetic bearing system which is digitally controlled and the control performance is investigated experimentally in relation to unbalance response and control energy. It is found that the isotropic optimal control method, which essentially eliminates the backward unbalance response component, is more efficient than the conventional optimal control in that it gives smaller major whirl radius and yet it often requires less control effort.

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15

Abele, Eberhard, Andreas Schiffler, and Stefan Rothenbücher. "System identification during milling via active magnetic bearing." Production Engineering 1, no. 3 (June 12, 2007): 309–14. http://dx.doi.org/10.1007/s11740-007-0022-z.

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16

Zhang, Yanhong. "Active magnetic bearing system based on sliding mode control." Modern Physics Letters B 31, no. 19-21 (July 27, 2017): 1740013. http://dx.doi.org/10.1142/s0217984917400139.

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A new sliding mode variable structure control algorithm suitable for active magnetic bearing is proposed, which is widely used for nonlinear control system. The model and controller is designed, simulation and experimental parts are also made, according to the switching function and the sliding mode control law. The current of electromagnet is adjusted to realize stable levitation of the rotor. The experimental result shows that the sliding mode variable structure controller is an effective way for magnetic bearing control, and the active magnetic bearing system is a highly nonlinear and advanced control method that can reduce the setting time and the cost.

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17

Fu, Hong Ya, Ping Fan Liu, Qing Chun Zhang, and Y. T. Wang. "Vibration Modal Analysis of the Active Magnetic Bearing System." Key Engineering Materials 458 (December 2010): 137–42. http://dx.doi.org/10.4028/www.scientific.net/kem.458.137.

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Based on the principle of axial active magnetic bearing rotor-system with single degree of freedom, magnetic rotor-system vibration mode was described. A 3D finite element model of active magnetic bearing rotor-system was established by ANSYS11. Initial six order natural frequencies and vibration mode were calculated by the module of modal analysis of ANSYS11, and compared with the results of system identification. Analysis shows that there was a certain difference between the results, but the difference was small. The analysis result indicates that it is an effective method to apply FEA in the design of the active magnetic bearing. It provided the foundation for structure optimal design of the system and theoretical basis for flexible system design.

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Ivannikov, Yuri, Aleksandr Goriachkin, and Dmitry Bragin. "Cooling of an Active Magnetic Bearing." Известия высших учебных заведений. Электромеханика 64, no. 2 (2021): 22–31. http://dx.doi.org/10.17213/0136-3360-2021-2-22-31.

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In this paper temperature field of the magnetic bearing of a gas compressor unit was considered. A two dimension mathematical model was prepared. Model parameters were calculated with using of analytical techniques and laws of similarity. In result of numerical simulation temperature distribution of the magnetic bearing was made specific. Possibility of using of heat pipes for a magnetic bearing cooling improve was consid-ered. In result of this research temperature distribution of the magnetic bearing was identified. The particular characteristic of this a magnetic bearing design is significant influence of more hot rotor on coil thermal condition. Improve of rotor cooling based on using of heat pipes can decrease maximum temperature of rotor and coil stator. Found results can be using for development of cooling system of an active magnetic bearing.

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Peel, D. J., C. M. Bingham, Y. Wu, and D. Howe. "Simplified characteristics of active magnetic bearings." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 216, no. 5 (May 1, 2002): 623–28. http://dx.doi.org/10.1243/0954406021525296.

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Traditionally, active magnetic bearing (AMB) systems are designed as an integral component of machines having generally complex dynamic characteristics. An AMB supported rotor has been tested over a speed range that included system natural vibration frequencies. A linear stiffness and viscous damping AMB characteristic with constant coefficients was identified which was independent of the overall system characteristics and which can thus provide simple and transferable data for a machine designer.

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20

Ishii, T., and R. Gordon Kirk. "Transient Response Technique Applied to Active Magnetic Bearing Machinery During Rotor Drop." Journal of Vibration and Acoustics 118, no. 2 (April 1, 1996): 154–63. http://dx.doi.org/10.1115/1.2889643.

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The active magnetic bearing (AMB) is a relatively new technology which has many advantages compared with conventional bearing design. In an AMB system, the rolling-element back-up bearings are indispensable to protect the magnetic bearing rotor and stator, and other stationary seals along the rotor shaft. In this paper, a theoretical formulation is proposed and solved numerically to examine the transient response of the flexible rotor, from the time just previous to when the AMB shuts down and including the rotor drop onto the back-up bearing. The backward whirl of the rotor, which may lead to the destructive damage of the machinery, has been analytically predicted at very light support damping and very high support damping. Also, the vibration due to the nonlinearity of the contact point geometry has been included in the analysis. The influence of the support damping on the displacement of the disk and also the contact force between the journal and the inner-race of the back-up bearing have been computed for various rotor system parameters. By comparing these results with the optimum support damping for the simple flexible rotor model, it is shown that this support damping optimization can be applicable for specifying the required optimum range of support damping for the back-up bearings of AMB systems.

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21

Zhu, Huang Qiu, Jia Ju Chen, and Xiao Dong Sun. "Active disturbances rejection decoupling control for active magnetic bearing multivariable system." International Journal of Modelling, Identification and Control 7, no. 1 (2009): 119. http://dx.doi.org/10.1504/ijmic.2009.027033.

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22

Spychała, Jarosław, Mariusz Żokowski, and Paweł Majewski. "Vibration Reduction System Using Magnetic Suspension Technology." Journal of KONBiN 27, no. 1 (January 29, 2015): 31–42. http://dx.doi.org/10.2478/jok-2013-0103.

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Abstract The article presents considerations concerning the construction of vibration reduction system using magnetic suspension technology. Presents the results of simulation, numerical and experimental the bearingless electric motor, for which successfully used this type of solution. Positive results of research and testing have become the basis for the development of the concept of building this type of active vibration reduction system , at the same time acting as a support for a technical object, which is a jet engine. Bearing failures are manifested by loss or distortion of their mass, which leads to a total destruction of the roller bearing, and thus reflected in the security. The article presents the concept of building active magnetic suspension to eliminate the bearing system of classical rolling bearing and replace it with magnetic bearing.

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23

Guan, Xudong, Jin Zhou, Chaowu Jin, and Yuanping Xu. "Disturbance suppression in active magnetic bearings with adaptive control and extended state observer." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 234, no. 2 (May 30, 2019): 272–84. http://dx.doi.org/10.1177/0959651819849774.

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Some sources of disturbance inevitably exist in magnetic bearings systems in the process of operation. This article proposes a disturbance suppression scheme for active magnetic bearings systems using an improved characteristic model-based all-coefficient adaptive control algorithm. First, the mathematical model of the magnetic bearing system is established. Then, by introducing the extended state observer into the adaptive control, the adaptive control method is improved. And the simulation of the combined control of the adaptive control and extended state observer is carried out based on mathematical model of controlled object. Simulation results demonstrate that this control method can not only adjust the control parameters online, but also estimate and compensate the disturbance in real time, which improves the control performance of the controller. Finally, the feasibility of adaptive control method with extended state observer is verified by experiments. When the sinusoidal disturbance signal is introduced at the 9000 r/min, the vibration displacement of the magnetic bearing system with the improved adaptive controller is reduced around 43%, which is in accordance with the theoretical results.

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Xiao, Y., K. Y. Zhu, C. Zhang, K. J. Tseng, and K. V. Ling. "Stabilizing Synchronization Control of Rotor-Magnetic Bearing Systems." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 219, no. 7 (November 1, 2005): 499–510. http://dx.doi.org/10.1243/095965105x33572.

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Active magnetic bearings, which provide non-contact suspension for high-speed rotors, have received increasing attention in recent years. Although the contactless nature of magnetic bearings brings up many advantages over conventional bearings, one of the challenging problems is to stabilize the rotor of the magnetic bearing systems that is very sensitive to outside disturbances and plant uncertainties. In this paper, a stabilizing synchronization design of rotor-magnetic bearing systems is proposed by incorporating cross-coupling technology into the optimal control architecture, which can be decomposed into two problems: a robust optimal control problem to improve the synchronization performance of the rotor in the radial directions and a stability problem. The control scheme is based on minimization of a new quadratic performance index in which the synchronization errors are embedded. Stability of the control scheme is also investigated through the linear quadratic Gaussian (LQG) optimal control technique. Simulations on a compact and efficient flywheel energy storage system with integrated magnetic bearings demonstrate that the proposed approach is very effective to recover the unstable system when the outside disturbances are present.

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Jung, Hoon Hyung, Seung Hee Kang, Bang Hyun Cho, and Chae Sil Kim. "A Design Technique for a Magnetic Bearing-Rotor in a Turbo Blower Considering Critical Speeds." Advanced Materials Research 569 (September 2012): 564–67. http://dx.doi.org/10.4028/www.scientific.net/amr.569.564.

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This paper introduces a rotor design technique for a turbo blower supported by magnetic bearings that considers the critical speeds of the rotor. An important factor for rotor critical speeds is the stiffness of its bearings. The magnetic bearing acts as a negative spring, called the position stiffness prior to operation, and rotor systems are initially unstable until the stiffness (current stiffness) and damping in the active control rotating system are determined using closed loop control forces. This paper describes a finite element model for the rotor, derives the stiffness equations for the magnetic bearing, and defines the total magnetic bearing stiffness including the position stiffness and current stiffness. Finally, the magnetic bearing stiffness that avoids the rotor critical speeds is chosen.

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Yu, Wen Tao, Hong Wei Li, Shu Qin Liu, and Yun Peng Zhang. "The Application Design of Inductance Sensor in Active Magnetic Bearing." Applied Mechanics and Materials 364 (August 2013): 257–61. http://dx.doi.org/10.4028/www.scientific.net/amm.364.257.

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The sensor is an important part of the active magnetic bearing system, which directly affects the performance of the entire system. Compared with the eddy current sensor, inductive sensor has the advantages of low cost, high sensitivity, and is not sensitive to the electromagnetic environment; Influenced by the ambient temperature is small. In this paper, design research from two aspects of the sensor structure and circuit, and the sensor was tested and successfully used in maglev blower. This sensor design method can also be applied on other active magnetic bearings, such as magnetic levitation heart pumps, etc.

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Yu, Wen Tao, Hong Wei Li, and Shu Qin Liu. "Development of Magnetic Bearing Monitoring System." Applied Mechanics and Materials 602-605 (August 2014): 2436–39. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.2436.

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The monitoring system of AMB (Active Magnetic Bearing) can display rotor displacement signals and real-time current signal of electromagnetic coils, monitoring the rotor running status of AMB. This article describes the monitoring system that is based on the AMB original hardware circuit and details of its hardware components and software modules function. Experiments show that: the function of each part of the electromagnetic bearing monitoring system uptime, and has good expansion; this system has been successfully applied in second flexible critical speed rotor magnetic bearing system.

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GAO, Hui. "Analysis of Beat Vibration for Active Magnetic Bearing System." Journal of Mechanical Engineering 47, no. 13 (2011): 104. http://dx.doi.org/10.3901/jme.2011.13.104.

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Hutterer, Markus, Gerald Kalteis, and Manfred Schrödl. "Redundant unbalance compensation of an active magnetic bearing system." Mechanical Systems and Signal Processing 94 (September 2017): 267–78. http://dx.doi.org/10.1016/j.ymssp.2017.02.040.

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Thomas, C. A., and K. P. Reimer. "Vibrations of turbo-molecular vacuum pumps with high stable magnetic bearings operating within electronic microscope systems." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 368–69. http://dx.doi.org/10.1017/s0424820100086143.

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In order to operate Electronic Microscopes vibration free, it is necessary to assemble the apparatus on a vibration free isolated desk. Similarly, strict requirements, regarding vibrations, are demanded from the attached vacuum pump which provides vacuum for the system. The rotor and rotating shaft of Turbo Molecular Pumps with mechanical bearings are connected to the pump housing by means of ball bearings. The inertia and vibration component resulting from the ball bearing dynamic effects produce the vibration results as indicated in Fig. 1.In order to design a Turbo Molecular Pump with minimum vibration effects it was necessary to provide the pump with a magnetic bearing system containing 4 passive and 1 active controlled axis. This magnetic bearing system is less sensitive to vibration and simpler in assembly than other existing more complicated 5-axis active controlled versions. However it is more complication than the mechanical bearing type. The magnet bearing is provided with a touch-down bearing. Larger pump movements due to high or low frequency stimulation recieved via the microscope desk could result in forcing the shaft out of its magnet-bearing-centre position, the touch-down bearing now re-centres the shaft allowing immediate magnetic bearing centre recovery.

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Zhang, Wei Wei. "Coupled Dynamic Analysis of Magnetic Bearing-Rotor System under the Influences of Base Motion." Applied Mechanics and Materials 109 (October 2011): 199–203. http://dx.doi.org/10.4028/www.scientific.net/amm.109.199.

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To investigate the active magnetic bearing-rotor system which is influenced by the base motion, coupled dynamic model is developed in this paper. The effects of base motion, electrical differential equations of control system and the mounting of sensors at different positions on the dynamic characteristics of the magnetic bearing-rotor system were discussed. The feasibility of the dynamic model is illustrated. This dynamic model can be used for the coupled electromechanical dynamics analysis of rotor system equipped with magnetic bearings.

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Li, Hong Wei, Wen Tao Yu, You Peng Fan, and Shu Qin Liu. "Influence of Retainer Bearing Misalignment on the Performance of Active Magnetic Bearing." Advanced Materials Research 588-589 (November 2012): 141–46. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.141.

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The retainer bearing will be misaligned for mechanical errors, which leads to the uneven air gap of AMB and affects the performance of AMB. To study this problem, the electric-magnetic force model was built first with the misalignment of retainer bearing. With this model, the influences of the misalignment on the system stiffness, damping and damping ratio of AMB were studied through theory analysis and simulation based on the PID controller with low-pass filters. The study indicates that the system stiffness and damping ratio of AMB employing PID controller will increase with the increase of retainer bearing misalignment. The results provide certain references for the system structure optimum design, system debugging and fault diagnosis and performance improvement of AMB-rotor system.

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33

Wang, Xiaoyuan, Yaopeng Zhang, and Peng Gao. "Design and Analysis of Second-Order Sliding Mode Controller for Active Magnetic Bearing." Energies 13, no. 22 (November 16, 2020): 5965. http://dx.doi.org/10.3390/en13225965.

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An active magnetic bearing (AMB) is a kind of high-performance bearing that uses controllable electromagnetic force to levitate the rotor. Its control performance directly affects the operation characteristics of high-speed motors and other electromechanical products. The magnetic bearing control model is nonlinear and difficult to control. Sliding mode control algorithm can be used in the magnetic bearing control system, but the traditional sliding mode control has the problem of high-frequency chattering, which affects the operation stability of magnetic bearings. Based on the second-order sliding mode control algorithm, a new second-order sliding mode controller for active magnetic bearing control was designed, and the stability of the designed sliding mode control law was proven by Lyapunov criterion. On the basis of the established active magnetic bearing control model, the numerical analysis of the designed controller was carried out, and the control effect was compared with that obtained by the exponential reaching law for the sliding mode control algorithm. The experimental results show that the designed sliding mode controller has better dynamic performance and stability than the exponential reaching law for the sliding mode controller.

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Nguyen, Danh Huy, Minh Le Vu, Hieu Do Trong, Danh Giang Nguyen, and Tung Lam Nguyen. "Active disturbance rejection control-based anti-coupling method for conical magnetic bearings." Acta Polytechnica 62, no. 4 (August 31, 2022): 479–87. http://dx.doi.org/10.14311/ap.2022.62.0479.

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Conical-shape magnetic bearings are currently a potential candidate for various magnetic force-supported applications due to their unique geometric nature reducing the number of required active magnets. However, the bearing structure places control-engineering related problems in view of underactuated and coupling phenomena. The paper proposes an Adaptive Disturbance Rejection Control (ADRC) for solving the above-mentioned problem in the conical magnetic bearing. At first, virtual current controls are identified to decouple the electrical sub-system, then the active disturbance rejection control is employed to eliminate coupling effects owing to rotational motions. Comprehensive simulations are provided to illustrate the control ability.

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Nicolsky, R., A. S. Pereira, R. de Andrade, D. F. B. David, J. A. Santisteban, R. M. Stephan, A. Ripper, W. Gawalek, T. Habisreuther, and T. Strasser. "Development of hybrid bearing system with thrust superconducting magnetic bearing and radial active electromagnetic bearing." Physica C: Superconductivity 341-348 (November 2000): 2509–12. http://dx.doi.org/10.1016/s0921-4534(00)01298-3.

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Loginov, Sergei, Dmitriy Fedorov, Igor Savrayev, Igor Plokhov, Andrey Hitrov, and Alexander Hitrov. "INDUCTIVE LINEAR DISPLACEMENT SENSOR IN ACTIVE MAGNETIC BEARING." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 20, 2019): 151. http://dx.doi.org/10.17770/etr2019vol3.4070.

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Active magnetic bearings are increasingly used in various fields of industry. The absence of mechanical contact makes it possible to use them in ultra-high-speed electric drives. The main trend of active magnetic bearings development is the improvement of the control system. The main problem of the control system is the displacement sensor (most of them has low accuracy and large interference). The sensor must have the following properties: simple in realization, high linearity of the characteristic, high sensitivity and noise immunity, high reliability. At the present time there is no sensor that satisfies all these conditions. Most manufacturers use various kinds of filters to get an accurate position signal. This increases the response time of the control system. Thus, problem of designing and modeling the position sensor, considered in the article is topical.

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Huynh, Van Van, and Minh Hoang Quang Tran. "Integral Sliding Mode Control Approach for 3-Pole Active Magnetic Bearing System." Applied Mechanics and Materials 829 (March 2016): 128–32. http://dx.doi.org/10.4028/www.scientific.net/amm.829.128.

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In this paper, a new integral sliding mode control scheme is designed for the 3-pole active magnetic bearing system. First, a new integral sliding surface is designed such that the 3-pole active magnetic bearing system in the sliding mode is asymptotically stable under certain conditions. Then, an adaptive controller is designed to solve the unknown upper bound of matched uncertainty and guarantee the reachability of the integral sliding surface. Finally, the performance of the proposed integral sliding mode controller is applied to 3-pole active magnetic bearing system to demonstrate the efficacy of the proposed method.

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ISHIDA, Yukio, Tsuyoshi INOUE, and Masaki KAKITANI. "Vibration Analysis of an Active Magnetic Bearing-Backup Bearing-Rotor System (Vibration Characteristics for the Various Fault Patterns of an Active Magnetic Bearing)." Transactions of the Japan Society of Mechanical Engineers Series C 69, no. 683 (2003): 1741–48. http://dx.doi.org/10.1299/kikaic.69.1741.

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Chuan, MAO, and ZHU Changsheng. "Active Control of Bearing Force Transmissibility for Active Magnetic Bearings-rigid Rotor Systems." Journal of Mechanical Engineering 55, no. 19 (2019): 35. http://dx.doi.org/10.3901/jme.2019.19.035.

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JANG, MING-JYI, and CHA'O-KUANG CHEN. "BIFURCATION ANALYSIS IN FLEXIBLE ROTOR SUPPORTED BY ACTIVE MAGNETIC BEARING." International Journal of Bifurcation and Chaos 11, no. 08 (August 2001): 2163–78. http://dx.doi.org/10.1142/s0218127401003437.

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In this paper, bifurcation analysis of the dynamic response of active magnetic bearing (AMB) with flexible rotor is presented, which includes the coupling effect between X-Y directions caused by rotational motion. The AMB systems include many nonlinear factors, such as mass imbalance, mass ratio with disk and journal, material property of shaft, and magnetic forces, etc., and its dynamic behavior are inherently nonlinear. Bifurcation diagrams of shaft journal's center, trajectories, power spectra, and Poincaré maps are used to analyze the dynamic behavior of the AMB system under different operational conditions. The key factors affecting the dynamic characteristics of the AMB system are identified. It will be beneficial to the design of AMB system.

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Dagnaes-Hansen, Nikolaj A., and Ilmar F. Santos. "Permanent magnet thrust bearings for flywheel energy storage systems: Analytical, numerical, and experimental comparisons." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 15 (April 23, 2019): 5280–93. http://dx.doi.org/10.1177/0954406219843952.

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A new type of flywheel energy storage system uses a magnetic suspension where the axial load is provided solely by permanent magnets, whereas active magnetic bearings are only used for radial stabilization. This means that the permanent magnet bearing must provide all the axial damping. Furthermore, it must have as low a negative radial stiffness as possible to reduce the workload on the radial active magnetic bearings. Many different mathematical models for determining force, stiffness, and damping of permanent magnet bearings are available in the literature. This work will further develop the most applicable analytical and numerical methods in order to make them directly implementable for designing permanent magnet thrust bearings for flywheel energy storage systems. The outcome is a fast and efficient method for determining force, stiffness, and damping when the bearing setup contains magnetic materials with relative permeability higher than one as well as when it does not. The developed method is validated against numerical and experimental results with good agreement.

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Du, Xiao Qiang, Yong Duan Song, Lei Wang, Yan Hui Wang, and Bao Liang Zan. "Advanced Adaptive Vibration Controller for Active Magnetic Bearing with Application to Energy Storage Flywheel." Advanced Materials Research 805-806 (September 2013): 530–36. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.530.

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This work introduced a kind of advanced adaptive control approach applied in Active magnetic bearing (AMB) to suppress the rotors vibrations in Flywheel Energy Storage System (FESS). The bearings system was built as a five degree-of-freedom (DOF) system and the four radial DOF among these were adopted AMB. Based on the Lyapunov theory, the proposed adaptive control law was designed to compensate various disturbance factors by controlling the AMBs. Finally, the simulation result illustrates that the proposed adaptive control law is effective to reduce the rotors vibration and improve the systems stability.

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Benšic, Tin, Marinko Barukcic, Željko Hederic, Venco Corluka, Nebojsa Bozidar Raicevic, and Ilona Iatcheva. "Position estimation of active magnetic bearing shaft using auxiliary coils." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 4 (July 2, 2018): 1328–41. http://dx.doi.org/10.1108/compel-08-2017-0366.

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Purpose The purpose of this paper is to develop a system for estimating the position of the active magnetic bearing (AMB) shaft. A new approach using the static and dynamic inductances and complex analytic signal to simplify the estimation procedure. Finite element (FE) simulations are introduced as a part of the system synthesis. Design/methodology/approach The paper presents an AMB displacement estimation system. The system is created with three inductive sensors. The position is computed from reﬁned static and dynamic inductance obtained from complex analytic signals of flux and current. FE simulation is used to relate reﬁned inductances to the displacement and to verify the model. Findings This paper shows the applicability of complex analytic signal transformation on estimation systems. The use of new refined inductance is presented in contrast to the classical approach of static and dynamic inductances. The paper shows that classical approach of static and dynamic inductance is not usable for the presented estimation system. Practical implications For the practical implementation of the presented system, it is necessary to know the exact dimensions of the AMB stator and the voltage and frequency used to supply the inductance estimation system. Originality/value The paper presents a system for estimating the displacement of AMB. The paper introduces the application of complex analytic signal to the estimation of AMB displacement. The mentioned signal is used to compute the new refined inductances. The comparison to the classical approach of static and dynamic inductances is given in this paper. The paper introduces FE simulations to the estimation system synthesis.

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Youcef-Toumi, K., and S. Reddy. "Dynamic Analysis and Control of High Speed and High Precision Active Magnetic Bearings." Journal of Dynamic Systems, Measurement, and Control 114, no. 4 (December 1, 1992): 623–33. http://dx.doi.org/10.1115/1.2897734.

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The successful operation of actively controlled magnetic bearings depends greatly on the electromechanical design and control system design. The function of the controller is to maintain bearing performance in the face of system dynamic variations and unpredictable disturbances. The plant considered here is the rotor and magnetic bearing assembly of a test apparatus. The plant dynamics consisting of actuator dynamics, rigid rotor dynamics and flexibility effects are described. Various components of the system are identified and their corresponding linearized theoretical models are validated experimentally. Tests are also run to identify the coupling effects and flexibility modes. The highly nonlinear behavior of the magnetic bearings in addition to the inherent instability of such a system makes the controller design complex. A digital Time Delay Controller is designed and its effectiveness evaluated using several simulations based on linear and nonlinear models for the bearing including bending mode effects. This controller is implemented as an alternative to an existing linear analog compensator. Several experiments are conducted with each controller for spinning and nonspinning conditions. These include time responses, closed loop frequency responses and disturbance rejection responses. The experimental results and comparisons between those of a digital Time Delay Controller and an analog compensator indicate that the Time Delay Controller has impressive static and dynamic stiffness characteristics for the prototype considered. The Time Delay Controller also maintains almost the same dynamic behavior over a significantly wide range of rotor speeds.

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Kjølhede, Klaus, and Ilmar F. Santos. "Experimental Contribution to High-Precision Characterization of Magnetic Forces in Active Magnetic Bearings." Journal of Engineering for Gas Turbines and Power 129, no. 2 (August 1, 2006): 503–10. http://dx.doi.org/10.1115/1.2434345.

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Parameter identification procedures and model validation are major steps toward intelligent machines supported by active magnetic bearings (AMB). The ability of measuring the electromagnetic bearing forces, or deriving them from measuring the magnetic flux, strongly contributes to the model validation and leads to novel approaches in identifying crucial rotor parameters. This is the main focus of this paper, where an intelligent AMB is being developed with the aim of aiding the accurate identification of damping and stiffness coefficients of active lubricated journal bearings. The main contribution of the work is the characterization of magnetic forces by using two different experimental approaches. Such approaches are investigated and described in detail. A special test rig is designed where the four pole AMB is able to generate forces up to 1900N. The high-precision characterization of the magnetic forces is conducted using different experimental tests: (i) by using hall sensors mounted directly on the poles (precise measurements of the magnetic flux) and by an auxiliary system, composed of strain gages and flexible beams attached to the rotor, (ii) by measuring the input current and bearing gap variations, monitoring the bearing input signals. Advantages and drawbacks of the different methodologies are critically discussed. The linearity ranges are experimentally determined and the characterization of magnetic forces with a high accuracy of <1% is achieved (percent error is normalized with respect to the instantaneous measured force obtained from the strain gauges signals).

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Ranft, E. O., G. van Schoor, and J. G. Roberts. "The development of a flexible rotor active magnetic bearing system." SAIEE Africa Research Journal 98, no. 1 (March 2007): 8–12. http://dx.doi.org/10.23919/saiee.2007.9487923.

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Wang, Xiping. "INVESTIGATION ON DYNAMIC PERFORMANCE OF ACTIVE MAGNETIC BEARING ROTOR SYSTEM." Chinese Journal of Mechanical Engineering 37, no. 11 (2001): 7. http://dx.doi.org/10.3901/jme.2001.11.007.

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Vuojolainen, Jouni, Niko Nevaranta, Rafal Jastrzebski, and Olli PyrhÃ¶nen. "Comparison of Excitation Signals in Active Magnetic Bearing System Identification." Modeling, Identification and Control: A Norwegian Research Bulletin 38, no. 3 (2017): 123–33. http://dx.doi.org/10.4173/mic.2017.3.2.

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Agarwal, Praveen Kumar, and Satish Chand. "Fuzzy logic control of three-pole active magnetic bearing system." International Journal of Modelling, Identification and Control 12, no. 4 (2011): 395. http://dx.doi.org/10.1504/ijmic.2011.040083.

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ITO, Makoto, Hiroyuki FUJIWARA, Naohiko TAKAHASHI, and Osami MATSUSHITA. "Evaluation of Stability Margin of Active Magnetic Bearing Control System." Transactions of the Japan Society of Mechanical Engineers Series C 71, no. 708 (2005): 2501–8. http://dx.doi.org/10.1299/kikaic.71.2501.

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Journal articles on the topic 'Active magnetic bearing system'

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