Log in

Relevant bibliographies by topics / Magnetic bearing

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Magnetic bearing'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Magnetic bearing.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Magnetic bearing"

1

OKADA, Yohji, Hidetoshi MIYAZAWA, Ryou KONDO, and Masato ENOKIZONO. "2A21 Flux Concentrated Hybrid Magnetic Bearing." Proceedings of the Symposium on the Motion and Vibration Control 2010 (2010): _2A21–1_—_2A21–12_. http://dx.doi.org/10.1299/jsmemovic.2010._2a21-1_.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Hirani, H., and P. Samanta. "Hybrid (hydrodynamic + permanent magnetic) journal bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 221, no. 8 (August 1, 2007): 881–91. http://dx.doi.org/10.1243/13506501jet282.

Full text

Abstract:

Survey of patents on bearings indicates the maturity of hydrodynamic and rapid development of magnetic bearings. Active magnetic bearings are costlier compared with permanent magnetic bearings. To understand the performance characteristics of permanent magnetic bearings, an experimental setup has been developed. Experimental studies on radial permanent magnetic bearings demonstrated the drawbacks, such as high axial thrust and low load capacity. This has led the authors to hybridize the permanent magnet with hydrodynamic technology and to explore the possibility of achieving the low starting torque of a permanent magnetic bearing and the medium to high load carrying capacity of a hydrodynamic bearing in a single bearing arrangement. Simulation is carried out in order to reduce axial force-effect and enhance the radial force supported by the permanent magnetic bearing. Results of simulation on permanent magnetic bearing have been compared with that of published research papers. Finally an algorithm has been developed to investigate the coupling of forces generated by permanent magnets and hydrodynamic actions. Results of load sharing have been reported. The experimentally measured displacements of the shaft running at 500, 2000, and 3000 r/min have been plotted. The effect of hydrodynamics on shaft orbit has been illustrated.

APA, Harvard, Vancouver, ISO, and other styles

3

Kurita, Nobuyuki, Keisuke Ohshio, and Takeo Ishikawa. "4A12 Design of permanent magnet hybrid magnetic bearing with minimum salient poles." Proceedings of the Symposium on the Motion and Vibration Control 2010 (2010): _4A12–1_—_4A12–10_. http://dx.doi.org/10.1299/jsmemovic.2010._4a12-1_.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

5

Li, Dongjie, Gang Zhang, Zhuoyuan Li, and Jinhua Sun. "Research on Heat Dissipation Scheme of Active Magnetic Bearing Based on ANSYS." Journal of Physics: Conference Series 2383, no. 1 (December 1, 2022): 012114. http://dx.doi.org/10.1088/1742-6596/2383/1/012114.

Full text

Abstract:

Compared to mechanical bearings, active magnetic bearings eliminate mechanical friction, resulting in lower energy losses. However, due to the magnetization characteristics and high-frequency working characteristics of the core material of the active magnetic bearing, there will be high wind friction loss, eddy current loss, hysteresis loss and copper loss in the active magnetic bearing. These losses will generate heat and increase the internal temperature of the bearing, which will not only affect the control accuracy of the active magnetic bearing and the stability of the rotor suspension, but may also cause irreversible damage to the components inside the active magnetic bearing. In this paper, different heat dissipation schemes are established to discuss the influence of the active magnetic suspension bearing on the loss and heat generation of the active magnetic bearing.

APA, Harvard, Vancouver, ISO, and other styles

6

Wang, Li Jun, Xiao Kang Yan, Fei Hu Li, and Zi Xin Dong. "Numerical Simulation of Magnetic Fluid Lubrication." Advanced Materials Research 154-155 (October 2010): 1498–501. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.1498.

Full text

Abstract:

This paper was concerned with theoretical analysis and the static characteristics of the journal bearing lubricated with magnetic fluid. A general Reynolds equation based on magnetic fluid model is obtained, which can be easily extended to other non-Newtonian fluids and this equation can provide theoretical basis for hydrodynamic analysis of magnetic fluid journal bearings. For the case of static loaded magnetic journal bearings, the influence of magnetic fluid effects on the lubrication performance is studied under various eccentricity ratios, magnetic intensity and concentration. The numerical results show that: with the increasing of concentration, the bearing capacity is obviously increased; the increase magnitude is larger when the eccentricity ratio is large. Under the effect of magnetic field, the bearing capacity increasing with the increasing of magnetic field intensity. When the eccentricity is small, the side leakage is highly decreased. It can be completely eliminate by appropriately designing the bearing geometry and the magnetic field which can’t be existed in normal journal bearings.

APA, Harvard, Vancouver, ISO, and other styles

7

Maslen, E. H., P. E. Allaire, M. D. Noh, and C. K. Sortore. "Magnetic Bearing Design for Reduced Power Consumption." Journal of Tribology 118, no. 4 (October 1, 1996): 839–46. http://dx.doi.org/10.1115/1.2831617.

Full text

Abstract:

Magnetic bearings have relatively low power consumption compared to fluid film and rolling element bearings. They are now candidates for supporting gas turbines and aeropropulsion engines. This paper describes the design and construction of permanent magnet biased, actively controlled magnetic bearings for a flexible rotor. The rotor was originally supported in fluid film bearings consuming as much as 3000 watts of power. For the magnetic bearing, both permanent magnets and electromagnets are used in a configuration which effectively provides the necessary fluxes in the appropriate air gaps to support the rotor. The theoretical development related to the bearing design is presented along with some experimental performance results. The results include measurements of power consumption, load capacity, bearing linearized coefficients, and the dynamic response of the rotor. The measured total power consumption, excluding shaft losses, was 210 watts in the permanent magnet biased bearing.

APA, Harvard, Vancouver, ISO, and other styles

8

Ling, Xiao, He Xiwu, and Cheng Wenjie. "Analysis of eddy current field for new type of thrust bearings based on single-objective genetic algorithm." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (December 10, 2020): 263–70. http://dx.doi.org/10.3233/jae-209330.

Full text

Abstract:

Based on the working condition of the magnetic thrust bearing (MTB), the single-objective optimization model (SOOM) is built. The optimum design of structure parameters for two types of magnetic bearings including traditional carbon bearing and soft magnetic composite (SMCs) bearing has been carried out using genetic algorithm. The analysis of eddy current field for two types of bearings are obtained by FEM. It is found that the maximum eddy current field of SMCs bearing is less than that of carbon steel one, and the air gap magnetic density is larger than that of carbon steel bearing at the same frequency. SMCs obtained by the compression of insulated soft magnetic powders have low eddy current. Thus, under the same magnetic force conditions, the input current of SMCs bearings is lower than that of carbon steel ones. The analysis shows that SMCs can replace carbon steel and has superiority in bearing application.

APA, Harvard, Vancouver, ISO, and other styles

9

Allaire, P. E., E. H. Maslen, D. W. Lewis, and R. D. Flack. "Magnetic Thrust Bearing Operation and Industrial Pump Application." Journal of Engineering for Gas Turbines and Power 119, no. 1 (January 1, 1997): 168–73. http://dx.doi.org/10.1115/1.2815543.

Full text

Abstract:

Magnetic bearings represent a new bearing technology, which has some advantages over conventional fluid film and wiling element bearings for some applications. The paper describes the basic concepts of magnetic thrust bearing operation involving the magnetic actuator, electronic controls, power amplifier, and sensor. The magnetic actuator is a magnetic circuit, which generates attractive forces. These support the rotating shaft. While it is often thought that magnetic bearings are highly nonlinear devices, this paper demonstrates that they are linear in both the perturbation flux and current when used in a double acting configuration. Electronic feedback controls are used to stabilize the bearing. Example design parameters are presented for an application to an industrial canned motor pump.

APA, Harvard, Vancouver, ISO, and other styles

10

Bassani, R., and S. Villani. "Passive magnetic bearings: The conic-shaped bearing." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 213, no. 2 (February 1999): 151–61. http://dx.doi.org/10.1243/1350650991542901.

Full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Magnetic bearing"

1

Li, Peichao. "Active touchdown bearing control in magnetic bearing systems." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678846.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Šindelář, Petr. "Návrh hybridního magnetického ložiska." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-443089.

Full text

Abstract:

The thesis deals with the design of a hybrid magnetic bearing. This is an extension of the issue of common bearings in high-speed motors. The work is divided into three parts. A general theory of magnetic bearings is described in the first part. The second part deals with the mathematical description of the bearing. A proposal of specific hybrid magnetic bearing is described in the third part. The bearing for the motor was already designed. It is a 45000rpm motor with a power output of 12 kW. This thesis aims to create a design of hybrid magnetic bearing with magnets to create a permanent magnetic field and coils to regulate forces to stabilize the rotor and limit vibrations. The practical design includes mathematical calculation in Matlab and computer simulation based on the finite element method in ANSYS Maxwell.

APA, Harvard, Vancouver, ISO, and other styles

3

Soukup, Vladimir. "Analysis and design of a magnetic bearing." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28519.

Full text

Abstract:

Magnetic bearings have recently begun to be employed in rotating machinery for vibration reduction, elimination of oil lubrication problems and prevention of failures. This thesis presents an analysis and design of an experimental model of a magnetic suspension system. The magnetic bearing, its control circuit and the supported object are modeled. Formulas are developed for the position and current stiffness of the bearing and the analogy with a mechanical system is shown. The transfer function is obtained for the control and experimental results are presented for the double pole one axis magnetic support system.
Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate

APA, Harvard, Vancouver, ISO, and other styles

4

Huang, Yang, and S3110949@student rmit edu au. "Model Predictive Control of Magnetic Bearing System." RMIT University. Electrical and Computer Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080430.152045.

Full text

Abstract:

Magnetic Bearing Systems have been receiving a great deal of research attention for the past decades. Its inherent nonlinearity and open-loop instability are challenges for controller design. This thesis investigates and designs model predictive control strategy for an experimental Active Magnetic Bearing (AMB) laboratory system. A host-target development environment of real-time control system with hardware in the loop (HIL) is implemented. In this thesis, both continuous and discrete time model predictive controllers are studied. In the first stage, local MPC controllers are applied to control the AMB system; and in the second stage, concept of supervisory controller design is then investigated and implemented. Contributions of the thesis can be summarized as follows; 1. A Discrete time Model Predictive Controller has been developed and applied to the active magnetic bearing system. 2. A Continuous time Model Predictive Controller has been developed and applied to the active magnetic bearing system. 3. A frequency domain identification method using FSF has been applied to pursue model identification with respect to local MPC and magnetic bearing system. 4. A supervisory control strategy has been applied to pursue a two stages model predictive control of active magnetic bearing system.

APA, Harvard, Vancouver, ISO, and other styles

5

Konkola, Paul Thomas 1973. "Magnetic bearing stages for electron beam lithography." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9315.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Khader, Shahbaz Abdul. "System Identification of Active Magnetic Bearing for Commissioning." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243630.

Full text

Abstract:

Active magnetic bearing (AMB) is an ideal bearing solution for high performance and energy efficient applications. Proper operation of AMB can be achieved only with advanced feedback control techniques. An identified system model is required for synthesizing high performance model based controllers. System identification is the preferred method for obtaining an accurate model. Therefore, it becomes a prerequisite for the commissioning of AMB. System identification for commissioning poses some challenges and special requirements. In this thesis, system identification of AMB is approached within the context of commissioning. A procedure for identification is developed and applied to experimental data from a prototype AMB system. The identification procedure is based on the so called prediction error method, and it has been performed in the frequency domain. A linear state-space model, along with the required parameters, is successfully identified.

APA, Harvard, Vancouver, ISO, and other styles

7

Nohavec, Donald R. (Donald Richard). "Magnetic bearing design for interferometric mirror-scanning mechanisms." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10487.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Cole, Matthew Owen Thomas. "Fault tolerant control of rotor/magnetic bearing systems." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285292.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Patel, Anup. "Pulsed field magnetization of composite superconducting bulks for magnetic bearing applications." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/256579.

Full text

Abstract:

Permanent magnets are essential components for many devices such as motors, which currently account for 45 % of global electricity consumption, generators and also superconducting magnetic bearings used for applications such as flywheel energy storage. But even the most powerful rare-earth magnets are limited to a remanent field of 1.4 T, whereas superconducting materials such as YBCO in their bulk form have the extraordinary ability to trap magnetic fields an order of magnitude higher, whilst being very compact. This gives them the potential to increase efficiency and allow significant volume and weight reductions for rotating machines despite the need for cooling. A new design of superconducting magnetic bearing has been developed which uses magnetized bulks as the field source, eliminating permanent magnets. Finite element modelling shows that the bulk – bulk design can achieve much higher force densities than existing permanent magnet – bulk designs, giving it potential to be used as a compact magnetic bearing. A system was created to magnetize bulks using a pulsed magnetic field down to 10 K and then measure levitation force. In proving the concept of the proposed design, the highest levitation forces ever reported between two superconducting bulks were measured, including a levitation force of 500 N between a 1.7 T magnetized YBCO bulk and a coaxial $MgB_{2}$ bulk tube. The biggest factor limiting the use of magnetized bulks in applications is magnetizing them in the first place. Using a pulsed magnetic field is most practical but generates excessive heat dissipation leading to a loss of flux in conventional bulk superconductors, which are 100% superconductor. Although multi-pulse techniques help maximise the trapped field, the poor thermal properties of bulk (RE)BCO are a limiting factor. New composite superconducting structures are reported which can overcome these problems by using high thermal conductivity materials, the motivation for which came from finite element modelling of the critical state coupled with heat transfer. In particular, composite structures created by cutting and stacking 12 mm wide (RE)BCO superconducting tape are shown experimentally to have exceptional field trapping ability due to superior thermal and mechanical properties compared to existing bulks. Up to 2 T was trapped in a stack of commercially available tape produced by SuperPower Inc. in the first reported pulsed magnetization of such a stack. Over 7 T was trapped between two stacks using field cooling at 4.2 K, the highest field yet trapped in such a sample.

APA, Harvard, Vancouver, ISO, and other styles

10

Hossain, Mohammad Ahsan. "High temperature, permanent magnet biased, homopolar magnetic bearing actuator." Thesis, Texas A&M University, 2006. http://hdl.handle.net/1969.1/4174.

Full text

Abstract:

The EEC (Electron Energy Corporation) in conjunction with the National Aeronautics and Space Administration is researching the magnetic bearings for an alternative to conventional journal or ball bearings. The purpose of this research was to design and develop a high-temperature (1000ÃÂºF) hybrid Magnetic Bearing using High Temperature Permanent Magnets (HTPM), developed by the EEC for high performance jet engines at high speeds that supply loads of 500 lbf. Another objective is to design and build a test rig fixture to measure the load capacity of the designed bearing. The permanent magnet bias of the Homopolar radial magnetic bearing reduces the amount of current required for magnetic bearing operation. This reduces the power loss due to the coil current resistance and improves the system efficiency because the magnetic field of the HTPM can suspend the major portion of the static load on bearing. A high temperature radial magnetic bearing was designed via an iterative search employing 3D finite element based electromagnetic field simulations. The bearing was designed to produce 500 lbf of force at 1000ÃÂºF and the design weight is 48 lbs. The bias flux of the Homopolar radial bearing is produced by EEC HTPM to reduce the related ohmic losses of an electromagnetic circuit significantly. An experimental procedure was developed to measure actual load capacity of the designed bearing at the test rig. All the results obtained from the experiment were compiled and analyzed to determine the relation between bearing force, applied current and temperature.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Books on the topic "Magnetic bearing"

1

Morales, Wilfredo. Permanent magnetic bearing for spacecraft applications. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2003.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

V, Brown Gerald, Inman D. J, and Lewis Research Center, eds. Adaptive variable bias magnetic bearing control. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

United States. National Aeronautics and Space Administration., ed. Cryogenic Magnetic Bearing Test Facility (CMBTF). [Washington, DC]: National Aeronautics and Space Administration, 1992.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

4

W, Curwen Peter, and United States. National Aeronautics and Space Administration., eds. Magnetic bearing for free-piston Stirling engines. [Washington, DC]: National Aeronautics and Space Administration, 1992.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

5

L, Poole William, and Langley Research Center, eds. Description of a magnetic bearing test fixture. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1987.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

6

Eliseo, DiRusso, Provenza A. J, and United States. National Aeronautics and Space Administration., eds. An active homopolar magnetic bearing with high temperature superconductor coils and ferromagnetic cores. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

7

Eliseo, DiRusso, Provenza A. J, and United States. National Aeronautics and Space Administration., eds. An active homopolar magnetic bearing with high temperature superconductor coils and ferromagnetic cores. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

8

Center, Langley Research, ed. A magnetic bearing control approach using flux feedback. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1989.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

9

Flowers, G. T. Dynamic behavior of a magnetic bearing supported jet engine rotor with auxiliary bearings. Albuquerque, N.M: TSI Press, 1994.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

10

Eliseo, DiRusso, Provenza A. J, and United States. National Aeronautics and Space Administration., eds. An active magnetic bearing with high T[subscript c] superconducting coils and ferromagnetic cores. [Washington, DC]: National Aeronautics and Space Administration, 1995.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Book chapters on the topic "Magnetic bearing"

1

Uriarte, Luis. "Magnetic Bearing." In CIRP Encyclopedia of Production Engineering, 1–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-642-35950-7_6534-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Uriarte, Luis. "Magnetic Bearing." In CIRP Encyclopedia of Production Engineering, 1117–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53120-4_6534.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Uriarte, Luis. "Magnetic Bearing." In CIRP Encyclopedia of Production Engineering, 815–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-20617-7_6534.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Fridman, Leonid, Alexander Poznyak, and Francisco Javier Bejarano. "Magnetic Bearing." In Robust Output LQ Optimal Control via Integral Sliding Modes, 115–21. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-0-8176-4962-3_10.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Okada, Yohji. "Self–Bearing Motors." In Magnetic Bearings, 461–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00497-1_16.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Moses, H. J., F. D. Pinckney, and D. A. Weise. "Magnetic Bearing Turbomachinery Operating Experience." In Magnetic Bearings, 245–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_23.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Nikolajsen, Jorgen L. "Experimental Investigation of an Eddy-Current Bearing." In Magnetic Bearings, 111–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_11.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Maslen, E. H., P. E. Allaire, M. A. Scott, and P. Hermann. "Magnetic Bearing Design for a High Speed Rotor." In Magnetic Bearings, 137–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_14.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Hongbin, Zhao, and Zhang Zuming. "Analysis on the Operating Stability of a Magnetic Bearing." In Magnetic Bearings, 121–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_12.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Okada, Yohji, Bunshu Nagai, and Takeshi Shimane. "Digital Control of Magnetic Bearing with Rotationally Synchronized Interruption." In Magnetic Bearings, 357–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Magnetic bearing"

1

Overstreet, Ross W., George T. Flowers, and Gyorgy Szasz. "Design and Testing of a Permanent Magnet Biased Active Magnetic Bearing." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8282.

Full text

Abstract:

Abstract Magnetic bearings provide rotor support without direct contact. There is a great deal of current interest in using magnetic bearings for active vibration control. Conventional designs use electrical current to provide the bias flux, which is an integral feature of most magnetic bearing control strategies. Permanent magnet biased systems are a relatively recent innovation in the field of magnetic bearings. The bias flux is supplied by permanent magnets (rather than electrically) allowing for significant decreases in resistance related energy losses. The use of permanent magnet biasing in homopolar designs results in a complex flux flow path, unlike conventional radial designs which are much simpler in this regard. In the current work, a design is developed for a homopolar permanent magnet biased magnetic bearing system. Specific features of the design and results from experimental testing are presented and discussed. Of particular interest is the issue of reduction of flux leakage and more efficient use of the permanent magnets.

APA, Harvard, Vancouver, ISO, and other styles

2

Enemark, Søren, and Ilmar F. Santos. "Dynamic Interaction Between Rotor and Axially-Magnetized Passive Magnetic Bearing Considering Magnetic Eccentricity." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38032.

Full text

Abstract:

Passive magnetic bearings are known due to the excellent characteristics in terms of friction and no requirement of additional energy sources to work. However, passive magnetic bearings do not provide damping, are not stable and, depending on their design, may also introduce magnetic eccentricity. Such magnetic eccentricities are generated by discrepancies in magnet fabrication. In this framework the main focus of the work is the theoretical as well as experimental investigation of the non-linear dynamics of a rotor-bearing system with strong emphasis on the magnetic eccentricities and non-linear stiffness. In this investigation passive magnetic bearings using axially-aligned neodymium cylinder magnets are investigated. The cylinder magnets are axially magnetised for rotor as well as bearings. Compared to bearings with radial magnetisation, the magnetic stiffness of axially-aligned bearings is considerably lower, nevertheless they allow for asymmetric stiffness mounting, and it could be beneficial for rotor stabilization. A theoretical model is proposed to describe the non-linear rotor-bearing dynamics. It takes into account non-linear behaviour of the magnetic forces and their interaction with a multi-body system composed of rigid rotor and flexible foundation. The magnetic eccentricities of the shaft magnets are modelled using the distances (amplitudes) and directions (phase angles) between the shaft axis and the centre of the magnetic fields generated. A perturbation method, i.e. harmonic balancing, is used in order to evaluate the frequency response of the non-linear system. The experimental validation of the model is carried out using a dedicated rotor-bearing system set-up. The test set-up consists of a vertical rigid shaft and disc supported by two passive magnetic bearings using axially-aligned neodymium cylinder magnets. The magnetic bearing housings are flexibly supported, allowing horizontal motions. The housings are connected to each other by means of elastic beams. The shaft is free in one end and coupled to a DC motor on the other by means of a flexible coupling. On the free end a disc is attached where imbalances and gyroscopic effect can be generated. Comparison between theory and experiment shows high level of resemblance, which validates the theoretical model and the explanations for the quasi-static and dynamic responses. The magnetic eccentricities and mass imbalance effects are clearly detected and distinguished.

APA, Harvard, Vancouver, ISO, and other styles

3

De Choudhury, Pranabesh. "Rotor Bearing System Design on Magnetic Bearings." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0506.

Full text

Abstract:

Abstract The rotordynamic analysis of a high speed multistage centrifugal compressor supported on radial magnetic bearings, which has been running successfully in the field for 9000 hours to date, is presented. Iterations required to achieve an acceptable rotor configuration using magnetic bearings are discussed. The results of the rotor-bearing system on standard fluid film five shoe tilting pad journal bearings are compared to the dynamics of the rotor on magnetic bearings. Correlation of the observed peak responses with those predicted on magnetic bearings is presented. The actual orbit plots and frequency plots during the coastdown of the rotor-bearing system on auxiliary ball bearings are discussed.

APA, Harvard, Vancouver, ISO, and other styles

4

Meeks, Crawford, and Victor Spencer. "Development of a Compact, Light Weight Magnetic Bearing." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-240.

Full text

Abstract:

A novel magnetic bearing design was created that uses permanent magnets to generate the primary magnetic field and attraction electromagnets for stabilization and control. This approach uses a geometrically efficient arrangement with a combination of axially flowing permanent magnet field and a circumferentially flowing electromagnetic field. This design was compared analytically with other types of magnetic bearing designs. The design comparison showed the new design to be 50% lighter weight and 50% lower in power consumption than all electromagnetic designs of equivalent performance. A demonstration model of this new approach was built and tested for performance at low shaft speeds. This test model successfully demonstrated the feasibility of this new approach.

APA, Harvard, Vancouver, ISO, and other styles

5

Saket, Fawaz Y., M. Necip Sahinkaya, and Patrick S. Keogh. "Touchdown Bearing Contact Forces in Magnetic Bearing Systems." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95510.

Full text

Abstract:

Under contact-free levitation, rotors supported by active magnetic bearings have many advantages such as allowing near frictionless rotation and high rotational speeds. They also provide the designer the capability to achieve increased machine power density. However, magnetic bearings possess limited load capacity and operate under active control. Under certain operational conditions, the load capacity may be exceeded or a transient fault may occur. The rotor may then make contact with touchdown bearings and the ensuing rotor dynamics may result in transient or sustained contact dynamics. The magnetic bearings may have the capability to restore contact-free levitation, though this will require appropriate control strategies to be devised. An understanding of the contact dynamics is required, together with the relationship between these and applied magnetic bearing control forces. This paper describes the use of a contact force measurement system to establish the force relationship. The contact force components measured by the system are calibrated against forces applied by an active magnetic bearing. The data generated can be used to validate non-linear dynamic system models and aid the design of control action to minimize or eliminate contact forces.

APA, Harvard, Vancouver, ISO, and other styles

6

Chen, H. Ming, James Walton, and Hooshang Heshmat. "Zero Clearance Auxiliary Bearings for Magnetic Bearing Systems." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-112.

Full text

Abstract:

Active magnetic bearings (AMBs) while offering many unique design and operational opportunities for advanced rotor systems, require some form of backup or auxiliary bearing in the event of a component failure or the onset of high transient loads. A zero clearance auxiliary bearing (ZCAB) has recently been conceived and a prototype system tested. The ZCAB presented in this paper uses a series of interconnected rollers to surround a shaft. In the open position, a clearance exists between the ZCAB rollers and the shaft. When the shaft drops on the ZCAB due to either an AMB failure or transient shock, the rollers move circumferentially and radially inward to eliminate the clearance and re-center the shaft. Besides centering the shaft, the law shaft-to-ZCAB traction coefficient and composite support dynamic characteristics eliminate the possibility of backward whirl. This paper presents the design methodology used, results of an analytical design study, including time transient analysis, as well as preliminary feasibility prototype testing under simulated AMB failure and transient shock conditions. The test rotor was supported by a rolling element bearing at one end and an integrated magnetic bearing/ZCAB support system at the other end. Both rotor drop and shock tests were performed with this configuration. Experimental results under simulated AMB failure and transient shock conditions demonstrated successful operation of the ZCAB.

APA, Harvard, Vancouver, ISO, and other styles

7

El-Shafei, A., and A. S. Dimitri. "Controlling Journal Bearing Instability Using Active Magnetic Bearings." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-28059.

Full text

Abstract:

Journal Bearings are excellent bearings due to their large load carrying capacity and favorable damping characteristics. However, Journal bearings are known to be prone to instabilities. The oil whirl and oil whip instabilities limit the rotor maximum rotating speed. In this paper, a novel approach is used to control the Journal bearing (JB) instability. An Active Magnetic Bearing (AMB) is used to overcome the JB instability and to increase its range of operation. The concept is quite simple: rather than using the AMB as a load carrying element, the AMB is used as a controller only, resulting in a much smaller and more efficient AMB. The load carrying is done by the Journal bearings, exploiting their excellent load carrying capabilities, and the JB instability is overcome with the AMB. This results in a combined AMB/JB that exploits the advantages of each device, and eliminates the deficiencies of each bearing. Different controllers for the AMB to control the JB instability are examined and compared theoretically and numerically. The possibility of collocating the JB and the AMB is also examined. The results illustrate the effectiveness of the concept.

APA, Harvard, Vancouver, ISO, and other styles

8

Allaire, P. E., E. H. Maslen, D. W. Lewis, and R. D. Flack. "Magnetic Thrust Bearing Operation and Industrial Pump Application." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-038.

Full text

Abstract:

Magnetic bearings represent a new bearing technology which has some advantages over conventional fluid film and rolling element bearings for some applications. The paper describes the basic concepts of magnetic thrust bearing operation involving the magnetic actuator, electronic controls, power amplifier, and sensor. The magnetic actuator is a magnetic circuit which generates attractive forces. These support the rotating shaft While it is often thought that magnetic bearings are highly nonlinear devices, this paper demonstrates that they are linear in both the perturbation flux and current when used in a double acting configuration. Electronic feedback controls are used to stabilize the bearing. Example design parameters are presented for an application to an industrial canned motor pump.

APA, Harvard, Vancouver, ISO, and other styles

9

Alves, Paul S., and Barry M. Alavi. "Magnetic Bearing Improvement Program at NOVA." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-323.

Full text

Abstract:

Nova Gas Transmission Ltd., located in Alberta, Canada, has lead the way in the application of dry gas seals and magnetic bearings to centrifugal compressors in gas pipeline service. The introduction of magnetic bearings in the NGTL system started in 1986 and to date some 34 units were installed. There are presently 31 units running with magnetic bearings due to some units being retired. It was part of NGTL vision to pursue the application of technologies holding promise of increased efficiencies for the pipeline. The installation of units with magnetic bearings had coincided with a period of rapid expansion of the pipeline in which there were limited resources and time available to assess equipment performance. Well into the magnetic bearing program, challenges associated with the magnetic bearing systems started to accumulate to a point where a serious study was warranted. These were in essence, the incidence of unit shutdowns, failure of components, and ultimately some instances of internal rubs of the rotating elements of the compressors. A complete technical audit of the magnetic bearing installed base at NGTL was conducted to evaluate potential improvements to the system, improve the knowledge of NGTL personnel in the relevant technical aspects, and set the foundation for on-going management of the technology. This audit effort pointed out several areas for improvement and a number of remedies were selected for implementation; mostly changes in the control system design, auxiliary bearing layout, and quality control of the installation. The changes proposed have been implemented in 18 units during 1995, with some other 6 planned for 1996. The results were excellent with the reliability of the upgraded units reaching virtually 100%. It should be pointed out that these 18 units have now accumulated 22,000 hours in service throughout the year. The most important part of this program is however, the Quality Control of the installations. We can say most of our problems in the past could certainly be attributed to poor quality control and should not be seen as an indictment of the magnetic bearings. There is optimism about the magnetic bearing performance and the long term benefits of using this technology.

APA, Harvard, Vancouver, ISO, and other styles

10

Hawkins, Lawrence A. "Shock Analysis for a Homopolar, Permanent Magnet Bias Magnetic Bearing System." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-230.

Full text

Abstract:

A transient, nonlinear analysis was developed and used to study the effect of shock machine testing on a gas turbine simulator supported by homopolar, permanent magnet bias magnetic bearings. The magnetic bearing nonlinearities modeled included saturation effects, clearance effects, and integrator and current limits. Free vertical travel of the shock machine anvil table supporting the simulator was also modeled. The magnetic bearing model was coupled to characteristic matrix based models of the rotor and support system and integrated to produce a time simulation of system performance. The results indicate saturation of the magnetic bearing for brief periods following impacts significant enough to exceed design load capacity, followed by recovery to stable operation in less than a second. The analysis was used to evaluate sizing for the magnetic bearing and backup bearing systems and to evaluate the control system strategy.

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Magnetic bearing"

1

Fowler, T. K. Magnetic bearing update. Office of Scientific and Technical Information (OSTI), May 1995. http://dx.doi.org/10.2172/135052.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Hagler, L. A HYBRID PASSIVE/ACTIVE MAGNETIC BEARING SYSTEM. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/15014167.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Post, R. F. Stability Issues in Ambient-Temperature Passive Magnetic Bearing Systems. Office of Scientific and Technical Information (OSTI), February 2000. http://dx.doi.org/10.2172/792426.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Durling, Mike. Direct Model Reference Adaptive Control for a Magnetic Bearing. Office of Scientific and Technical Information (OSTI), November 1999. http://dx.doi.org/10.2172/767405.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Popov, Emilian. Computing of Fluidic Forces in Rotating Cylinders with Application to Active Magnetic Bearing Control. Office of Scientific and Technical Information (OSTI), February 2022. http://dx.doi.org/10.2172/1846523.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Choi, Heeju, and Alan Palazzolo. Ultra High-Temperature Magnetic Bearing System for s-CO<sub>2</sub> Turbines/Expanders. Office of Scientific and Technical Information (OSTI), June 2022. http://dx.doi.org/10.2172/1873658.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Post, R. F. Passive magnetic bearings for vehicular electromechanical batteries. Office of Scientific and Technical Information (OSTI), March 1996. http://dx.doi.org/10.2172/10139868.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Post, R. Passive magnetic bearings for vehicular electromechanical batteries. Office of Scientific and Technical Information (OSTI), March 1996. http://dx.doi.org/10.2172/15007279.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Nelson, Jonathan P. Active Control of Fan Noise in Ducts Using Magnetic Bearings. Fort Belvoir, VA: Defense Technical Information Center, May 2002. http://dx.doi.org/10.21236/ada403756.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Wiggins, John S. Active Control of Rotating Machinery Noise Through Use of Magnetic Bearings. Fort Belvoir, VA: Defense Technical Information Center, January 1998. http://dx.doi.org/10.21236/ada359086.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!