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Design Method for the magnetic bearing Control System with Fuzzy-PID Approach

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Journal of Beijing Institute of Technology 2008年第3期17卷 270-273页

作者：徐春广吕冬明郝娟 School of Mechanical and Vehicular Engineering Beijing Institute of Technology

The five degree freedom magnetic bearing is researched and its structure and working principles are introduced also. Based on the fuzzy control technology, combining fuzzy algorithm and PID control method, identifying the transition process mode of the online system to get the PID parameters＇ self-adjusting, the magnetic beating system＇s Fuzzy-PID nonlinear controller is designed by analyzing the system control demands. The Fuzzy-PID nonlinear controller can deal with the magnetic bearing system＇ s open loop instability and strong nonlinearity, and the approach could improve the system＇s rapidity, adaptability, stability and dynamic characteristics. Comparative analysis and experiments are conducted between linear PID and nonlinear fuzzy- PID control methods, the results show that the fuzzy-PID controller is better, and the five-freedom magnetic bearing＇ s rotary precision experiments are conducted by the fuzzy-PID controller, it satisfies the control rotary precision demands and realizes the hearing＇s steady floating and rotating.

关键词： magnetic bearing fuzzy design fuzzy-PID control performance experiments

Research on the Architecture of the CAD System of a magnetic bearing Based on Pattern-oriented

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Journal of Donghua University(English Edition) 2006年第2期23卷 39-43页

作者：陈瑞卿孙岩桦陈建斌虞烈 Institute of Mechatronics and Information Systems Xi'an Jiaotong University College of Science Xi'an Polytechnic University

The architecture of the CAD system of a magnetic bearing is established by using pattern-oriented software architecture. Based on the pipe-filter pattern, all the present resources come from different developing environments, aiding the design of a magnetic bearing system, can be integrated into the system. Replacing the original pipes with database, the concurrent design can be realized in the design process, which changes the serial mode of traditional manufacture. The distributed and heterogeneous design resources can be integrated into the system and shared by importing the broker pattern. Combining pipe-filter pattern with broker pattern, the system is opening and easy to maintain and extend.

关键词： magnetic bearing system structure pipe-filter pattern broker pattern.

A novel permanent magnetic bearing and its anti-wear effect in impeller total artificial heart

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Progress in Natural Science:Materials International 2003年第4期 66-68页

作者： QIAN Kunxi, RU Weimin, ZENG Pei and YUAN Haiyu(Institute of Biomedical Engineering, University of Jiangsu, Zhenjiang 212013, China) Institute of Biomedical Engineering University of Jiangsu Zhenjiang 212013 China

A novel permanent magnetic bearing has been developed, which consists of two magnetic rings with differenl dimensions in the same direction of axial magnetization, located concentrically. Because of the effect of magnetic field, the magnetic rings keep a distance axially from each other. If the distance between the two rings changes, a rehabilitalion force is produced to return to the original po-sition. When this distance decreases, a repeiling force will be generated; its component in axial direction can be used as a magnetic spring and its radial component can function as a bearing. With this novel permanent magnetic bearing, an impeller totai artificial beart (TAH) is designed, manufactured and tested. The rotation is driven radially. On the left and right sides of the rotor magnets, two small magnetic rings are fixed onto the rotor, coupling with two big magnetic rings on both sides of the motor coil, to form the magnetic bearings. Hereby the bearings are used for wear reduction rather than rotor l

关键词： permanent maglev magnetic bearing impeller blood pump f riction-reduction.

Dynamic Analysis of Flywheel Cells with magnetic bearing Systems

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Dynamic Analysis of Flywheel Cells with Magnetic Bearing Sys...

THE EDDY LOSSES OF A magnetic THRUST bearing

第十一届IFTOMM世界大会

作者： Han Zhao Zhiyi Yang Yong Wang Jie Tian School of Mechanical and Automotive Engineering Hefei University of Technology Hefei 230009 China

＜正＞A new hybrid magnetic bearing system is designed here especially for flywheel cells, which is made up of two radial permanent magnet bearings and an axial magnetic bearing, and a novel structure of the flywheel cell is proposed, which is easier to be produced. Meanwhile, a dynamic model of the new flywheel cell is established, and its dynamic analysis equations are derived.

关键词： Flywheel cell magnetic bearing Dynamic analysis

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Journal of Pharmaceutical Analysis 2004年第1期16卷 11-14页

作者：徐华王艳 School of Mechanical Eng.

Accurate calculations of losses associated with the operation of magnetic bearings are particularly important for high speed applications where the rotor losses are expected to be large and for some particular applications where even low power losses will be critical. Power losses in the magnetic thrust bearing is often neglected, but if there is misaligned in the rotor and bearing, the magnetic field in the thrust bearing is no longer axisymmetric one, or the dynamic control current in the winding is time dependent one, eddy currents are caused to flow inside the conducting material, then the power losses are very important for magnetic bearing design. This paper presents an analytical model of a thrust magnetic bearing, and the magnetic fields, forces and losses of thrust magnetic bearing are calculated. In the calculations the frequency of dynamic control current is up to 1 000 Hz, rotating speed is from 60 rpm to 1 200 rpm, and the non-linearity of material is also taken into consideration. The results shows that if the magnetic field is not saturation, the eddy losses is proportional to dynamic control current frequency and a square function of dynamic control current, and also 5/2 power function of shaft's speed.

关键词： magnetic bearing eddy losses non-linearity magnetic field

Improved One-Cycle Control Algorithm in Five-Phase Six-Leg Switching Power Amplifiers for magnetic Suspension bearing

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第5期37卷 796-803页

作者： LIU Chengzi YAN Ting YANG Yan LIU Zeyuan College of Automation&College of Artificial Intelligence Nanjing University of Posts and TelecommunicationsNanjing 210023P.R.China

For the advantages of easy realization and rapidly intelligent response,the one-cycle control was applied in five-phase six-leg switching power amplifier for magnetic *** paper improves the one-cycle control considering resistance voltage drop and derives its mathematical *** improved algorithm is compared with the former *** simulation and experimental results show that the improved algorithm can effectively reduce the output current ripple,achieve good tracking of the given current,improve the control accuracy,and verify the effectiveness and superiority of the method.

关键词： one-cycle control magnetic bearing switching power amplifier voltage drop

Nonlinear vibration analysis of a rotor supported by magnetic bearings using homotopy perturbation method

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Propulsion and Power Research 2017年第3期6卷 223-232页

作者： Aboozar Heydari Mina Mirparizi Farshad Shakeriaski Farhad Sheykh Samani Mohamadreza Keshavarzi National Iranian Oil Company Iran Shahid Bahonar University of Kerman KermanIran University of Yazd YazdIran University of Sistan and Baluchestan ZahedanIran

In this paper,the effects of nonlinear forces due to the electromagnetic field of bearing and the unbalancing force on nonlinear vibration behavior of a rotor is *** rotor is modeled as a rigid body that is supported by two magnetic bearings with eightpolar *** governing dynamics equations of the system that are coupled nonlinear second order ordinary differential equations(ODEs)are derived,and for solving these equations,the homotopy perturbation method(HPM)is *** applying HPM,the possibility of presenting a harmonic semi-analytical solution,is *** fact,with equality the coefficient of auxiliary parameter(p),the system of coupled nonlinear second order and non-homogenous differential equations are obtained so that consists of unbalancing *** considering some initial condition for displacement and velocity in the horizontal and vertical directions,free vibration analysis is done and next,the forced vibration analysis under the effect of harmonic forces also is ***,various parameters on the vibration behavior of rotor are *** in amplitude and response phase per excitation frequency are *** show that by increasing excitation frequency,the motion amplitude is also increases and by passing the critical speed,it *** it shows that the magnetic bearing system performance is in stable maintenance of *** parameters affecting on vibration behavior,has been studied and by comparison the results with the other references,which have a good precision up to 2nd order of embedding parameter,it implies the accuracy of this method in current research.

关键词： Nonlinear vibration behavior Rotor magnetic bearing Unbalancing force Coupled nonlinear second order equations homotopy perturbation

Research of Controller for Active magnetic bearings System

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Research of Controller for Active Magnetic Bearings System

应用于中压电机的正余弦绕组主动磁轴承的研发

第二届亚洲机械电子学学术会议

作者： Chunguang Xu Hui Huang Dongming Lv Juan Hao Yi Ding Dongming Lv School of Vehicle and Mechanical Engineering,Beijing Institute of Technology,Beijing,China,100081

In this paper the research is about models and controllers for active magnetic bearing(AMB) *** paper designs distributed controllers, performing the rotating accuracy experiments in the AMB ***,the problem was analyzed that the controlling effect is not good for higher speed rotors,and new solving method was provided based on the decoupling control *** simulation conclusion proves that the decoupling method made the better dynamic and static characteristics.

关键词： magnetic bearing distributed controller decoupling algorithm integrated control method

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风机技术 2020年第5期62卷 68-76页

作者： Larry Hawkins Alexei Filatov Rasish Khatri Venky Krishnan Calnetix Technologies

Calnetix has recently completed the design and development of the next generation medium voltage,megawatt high speed motor drive system using 10 kVSilicon Carbide power devices.A1.6MWmedium voltage motor supported by active magnetic bearings has been designed as a test platform for the *** heteropolar radial magnetic bearings feature a winding topology with separate bias,cos(x-control)and sin(y-control)coils on each *** approach is shown to produce a more uniform load capacity versus angle than the conventional bi-quadrant winding *** paper describes the design and motivation for the machine with primary emphasis on the magnetic bearing *** bench test results of the actuator are described and compared to *** applications for this type machine in wastewater recovery,exhaust gas remediation,and natural gas compression are discussed.

关键词： magnetic bearing High Speed Motor