Academic literature on the topic 'Hybrid magnetic bearing'
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Journal articles on the topic "Hybrid magnetic bearing"
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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_.
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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_.
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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.
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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.
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Heshmat, H., H. Ming Chen, and J. F. Walton,. "On the Performance of Hybrid Foil-Magnetic Bearings." Journal of Engineering for Gas Turbines and Power 122, no. 1 (October 20, 1999): 73–81. http://dx.doi.org/10.1115/1.483178.
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Recent technological advancements make hybridization of the magnetic and foil bearings both possible and extremely attractive. Operation of the foil/magnetic bearing takes advantage of the strengths of each individual bearing while minimizing each other’s weaknesses. In this paper one possible hybrid foil and magnetic bearing arrangement is investigated and sample design and operating parameters are presented. One of the weaknesses of the foil bearings, like any hydrodynamic bearing, is that contact between the foil bearing and the shaft occurs at rest or at very low speeds and it has low load carrying capacity at low speeds. For high speed applications, AMBs are, however, vulnerable to rotor-bending or structural resonances that can easily saturate power amplifiers and make the control system unstable. Since the foil bearing is advantageous for high speed operation with a higher load carrying capacity, and the magnetic bearing is so in low speed range, it is a natural evolution to combine them into a hybrid bearing system thus utilizing the advantages of both. To take full advantage of the foil and magnetic elements comprising a hybrid bearing, it is imperative that the static and dynamic characteristics of each bearing be understood. This paper describes the development of a new analysis technique that was used to evaluate the performance of a class of gas-lubricated journal bearings. Unlike conventional approaches, the solution of the governing hydrodynamic equations dealing with compressible fluid is coupled with the structural resiliency of the bearing surfaces. The distribution of the fluid film thickness and pressures, as well as the shear stresses in a finite-width journal bearing, are computed. Using the Finite Element (FE) method, the membrane effect of an elastic top foil was evaluated and included in the overall analytical procedure. Influence coefficients were generated to address the elasticity effects of combined top foil and elastic foundation on the hydrodynamics of journal bearings, and were used to expedite the numerical solution. The overall program logic proved to be an efficient technique to deal with the complex structural compliance of various foil bearings. Parametric analysis was conducted to establish tabulated data for use in a hybrid foil/magnetic bearing design analysis. A load sharing control algorithm between the foil and magnetic elements is also discussed. [S0742-4795(00)01201-1]
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Liu, Qing, Shiping Zhang, Yuanyuan Li, Gang Lei, and Li Wang. "Hybrid gas-magnetic bearings: An overview." International Journal of Applied Electromagnetics and Mechanics 66, no. 2 (June 11, 2021): 313–38. http://dx.doi.org/10.3233/jae-201579.
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This paper presents a state-of-the-art survey on the development of the hybrid gas-magnetic bearing (HGMB) technology. HGMBs are proposed to complement the advantages of gas bearings and magnetic bearings for enhanced bearing performance. Nevertheless, there are a number of inherent challenges in their designs, analyses, and performance characteristics that must be taken into account for proper functionality and reliable operation. For this purpose, substantial results in theory, numerical simulations, and experiments concerning rotor dynamics, mechanical structures, control systems, and operation modes are discussed to help further investigation and implementation of HGMBs. In addition, future developments of HGMBs in industries and remaining challenges are discussed.
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Chen, Jun Hui, Feng Yu Yang, Chao Rui Nie, Jun Yang, and Peng Yan Wan. "Magnetic Force Characteristics and Structure of a Novel Radial Hybrid Magnetic Bearing." Applied Mechanics and Materials 150 (January 2012): 69–74. http://dx.doi.org/10.4028/www.scientific.net/amm.150.69.
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There are some problems in the permanent magnetic circuit of the current permanent magnet biased magnetic bearings, such as small magnetic force, low magnetic flux density and lack of self-stabilization. To solve this problem, a new hybrid radial magnetic bearing structure has been proposed. The nonlinear model and linearization equation of the new hybrid radial magnetic bearing capacity has been established by current molecular method and virtual displacement theorem. It is found that the permanent magnetic bearing can achieve self-stabilization in the radial degrees of freedom and can reduce the total displacement of negative stiffness. The results show that the air gap flux density is greatly improved by the new hybrid magnetic bearing with Halbach array structure. Current stiffness and displacement rigidity is closely related to initial current and initial gap of the equilibrium position. Near the equilibrium position, current stiffness and displacement rigidity are linear relationship. With the increase of air gap, it remains a good linearity. While with the decrease of air gap, it presents nonlinear characteristics..
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Cao, Yang, Ming Zong, and Jing Zhang. "Electromagnetic Force Modelling for Hybrid Magnetic Bearing." Advanced Materials Research 383-390 (November 2011): 7428–32. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.7428.
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In this paper, a novel structure of hybrid magnetic bearing with PM bias and inductance displacement sensor is proposed. The operating principle of the hybrid magnetic bearing with PM bias is introduced. The Electromagnetic Force Model is built in the paper, which is useful for the hybrid magnetic bearing control. An example is given. The analysis of finite element method shows that the structure of the hybrid magnetic bearing with PM bias proposed in the paper is feasible and the calculation method for hybrid magnetic circuit is correct.
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Park, Jung-Ho, Hu-Seung Lee, Young-Bog Ham, and So-Nam Yun. "A Study on Semi-Active Magnetic Bearing Position-Controlled by Piezoelectric Actuators." International Journal of Automation Technology 5, no. 4 (July 5, 2011): 594–600. http://dx.doi.org/10.20965/ijat.2011.p0594.
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This paper investigates non-contact hybrid bearings that use permanent magnets for repulsive force and piezoelectric actuators for position-control. A structurally-improved hybrid bearing is presented. First, the concept of the hybrid bearing is briefly introduced along with previous test results. Then, the newly devised bearing with a decreased gap between rotor and stator is designed and analyzed with FEM to optimize the magnetic forces. Finally, a prototype bearing using the proposed mechanism is fabricated and a control method is discussed.
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Xiao, Lin Jing, and Hong Chang Ding. "Study on Stiffness and Damping Characteristic of Hybrid Magnetic Bearing for High-Speed Electrical Machine." Advanced Materials Research 338 (September 2011): 534–38. http://dx.doi.org/10.4028/www.scientific.net/amr.338.534.
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This paper focuses on the stiffness and damping characteristic of hybrid magnetic bearing for high-speed electrical machine. Firstly, it analyzes the structure and working principle of hybrid magnetic bearing, according to the bearing’s magnetic circuit properties, it deduces the equation of the bearing’s magnetic force with displacement and current. Then, combining with the controller parameters it deduces the stiffness and damping equation of magnetic bearing. At last it simulates the stiffness and damping characteristic curve, and the obtained simulation results can give theoretical support for rotor dynamic analysis and modal analysis.
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Swanson, E. E., H. Heshmat, and J. Walton ,. "Performance of a Foil-Magnetic Hybrid Bearing." Journal of Engineering for Gas Turbines and Power 124, no. 2 (March 26, 2002): 375–82. http://dx.doi.org/10.1115/1.1417485.
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To meet the advanced bearing needs of modern turbomachinery, a hybrid foil-magnetic hybrid bearing system was designed, fabricated, and tested in a test rig designed to simulate the rotor dynamics of a small gas turbine engine (31 kN to 53 kN thrust class). This oil-free bearing system combines the excellent low and zero-speed capabilities of the magnetic bearing with the high-load capacity and high-speed performance of the compliant foil bearing. An experimental program is described which documents the capabilities of the bearing system for sharing load during operation at up to 30,000 rpm and the foil bearing component’s ability to function as a backup in case of magnetic bearing failure. At an operating speed of 22,000 rpm, loads exceeding 5300 N were carried by the system. This load sharing could be manipulated by an especially designed electronic control algorithm. In all tests, rotor excursions were small and stable. During deliberately staged magnetic bearing malfunctions, the foil bearing proved capable of supporting the rotor during continued operation at full load and speed, as well as allowing a safe rotor coastdown. The hybrid system tripled the load capacity of the magnetic bearing alone and can offer a significant reduction in total bearing weight compared to a comparable magnetic bearing.
Dissertations / Theses on the topic "Hybrid magnetic bearing"
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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.
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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.
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Lozano, Jauregui John Hugo. "Control for an active magnetic bearing machine with two hybrid electromagnet actuators." Master's thesis, Pontificia Universidad Católica del Perú, 2021. http://hdl.handle.net/20.500.12404/19548.
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This thesis work begins with the revision of state of the art about active magnetic bearings
(AMB), the mathematical methods used to obtain geometric and physical parameters that
will influence in the mechanical, electrical design and control system proposed by this
prototype.
The control system will activate the magnetic bearing to center its shaft, for which it is joined
a variable load in order to study the best control performance under different load over the
rotor proposed by requirements. When the rotor is not controlled in its own axis even though
variable load, a position error will occur that will be corrected by the program of a control
system that will center the shaft (rotor).
For this design was evaluated generalized AMB models [2], [3], [4] to validate the best
identification for this design, furthermore as a consequence to get the best performance for
the control system as it was achieved by generalized models and it was evaluated the
advantage of this AMB machine through “Two hybrid electromagnet actuators” and variable
load fixed to its shaft. For this reason, it was necessary to test a simple AMB with only one
electromagnet actuator [4], due to compare enhancement of hybrid characteristics for the
electromagnet actuators, for which, also it was evaluated how many actuators could be
necessary to join to an AMB system with the target to get the control. It means, in this work
there are comparisons between a simple AMB, generalized AMB models and this design,
owing to show the achievements of this design.
In order to show experimental results in state of the art, it is known that Siemens presented
Simotics Active Magnetic Bearings technology for wear free operation in large – machine
applications, regulated magnetic fields hold the rotor in suspension precisely without oil or
contact, to make this task, sensors capture the position of the shaft 16000 times per second
and a regulator adjusts the magnetic field to keep the rotor hovering precisely in the bearing
center [1].
By other side the author [4] describes the experimental results in which is proposed that at
low speed the bearing parameters are mainly determined by the controller characteristics.
While at high speed, the bearing parameters are not only related to the control rule but also
related to the speed. This may be due to the influence of eddying effect. [4]
Furthermore, by author [3], the algorithm to get fast responses in front of disturbances, the
disadvantages of these algorithms are given by not enough memory space to execute them,
due to computing time is short compared with rotor displacement response time, and it is
defined that it could be possible to execute the control algorithm through a real-time
operating system to obtain the desired response [3].
Finally, in reference [6] it is described about filtering every noise as additive white
Gaussian noise, by a predictive filter, which is obtained by analyzing Least Mean Square
(LMS) and feedback/feedforward algorithm.
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Hilton, Andrew. "Proposal for a cost-effective centrifugal rotary blood pump : design of a hybrid magnetic/hydrodynamic bearing." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/13919/.
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The growing worldwide prevalence of cardiovascular diseases (CVD) such as chronic heart failure (CHF) highlights the need for an effective treatment method. Annually, there are an estimated 17.5 million deaths caused by cardiovascular diseases worldwide, representing 30% of all global deaths; of these deaths approximately 50% are due to CHF [1] and about 80% occur in low- and middle-income countries [2]. If current trends are allowed to continue, by 2015 an estimated 20 million people annually will die from CVD [3]. Each year, only about 3,000 people receive a heart transplant as the only current definitive long-term treatment for end-stage CHF. To compound the severity of the situation, organ donations are decreasing (4). Implantable blood pumps offer an effective treatment to CHF, either as a bridge to transplantation / recovery, or as destination therapy i.e. use of long term mechanical circulatory support in patients with end-stage heart failure without the intention of eventual heart transplantation. With the number of sufferers of CHF rising in both the developed and developing world it becomes pertinent to design a cost effective device. It is the objective of this work to investigate the proposal of a new cost-effective Centrifugal Rotary Blood Pump (CRBP), which employs previously unutilized design methodology. Through the replacement of those complex, custom components seen within existing CRBPs with standard off-the-shelf components, and the implementation of high-throughput manufacturing processes, such as injection moulding, a reduction in component parts allows for a reduced profit margin and hence a reduced total cost of device. It is proposed by the author that the current production cost of LVAD devices may be reduced by up to 95%. The work presented in this thesis identifies the principal difference between current pump designs; this is their bearing system. It is proposed here to form a new classification of bearing type that combines a passive magnetic bearing and a hydrodynamic bearing such that the relative potential merits of both systems may be exploited. Through the amalgamation of established design techniques with other more modern design practices a rigorous, adaptive design tool has been produced that CRBP designers may use to quickly obtain full impeller and volute geometry from few input parameters. The geometry output provides a platform from which a new conceptual Left Ventricular Assist Device (LVAD) has been envisaged. Through experimental and computational analysis of the magnetic coupling, this investigation has shown that it is possible to integrate the magnetic bearing and the drive system into one component of design; it is possible to design a magnetic coupling that not only acts as the drive system for a CRBP, but as a bearing system that offers both axial and radial bearing forces. A spiral groove bearing (5GB) has been implemented as the hydrodynamic bearing as part of the hybrid system. Experimental investigation has shown the spiral groove bearing to be anti traumatic, which may be attributed to the short residence time of blood in the bearing. However, a reduction in the anticipated load capacity shows that the bearings are operating on a reduced viscosity; this is an indication of cell exclusion within the 5GB. Comparisons to aqueous glycerol tests of known viscosities have shown that the blood bearing is operating on a viscosity close to that of plasma. It is suggested that a "shear front differential" is the mechanism behind cell exclusion, in which RBCs migrate away from areas of high shear stress into areas of relatively low shear stress. This investigation has demonstrated the suitability of the hybrid magnetic / hydrodynamic bearing for use in a new CRBP. It has been shown that the electromagnetic drive system intended for implementation in to this CRBP can be used as an effective passive magnetic bearing. It is intended that the axial and radial bearing forces produced by the drive system are balanced by a conical spiral groove thrust bearing. The incorporation of the hydrodynamic bearing into the magnetic bearing transforms the previously unstable passive magnetic bearing to a stable hybrid bearing. The stability of the system has been predicted through numerical analysis of the stiffness matrix and through satisfaction of the stability criteria. The natural frequencies of the system have been calculated; these are shown to be sufficiently different from any excitation frequencies identified that may cause the system to behave in an unstable fashion at the operational speed of the pump. The main point to be realized from the analysis of the hybrid bearing system, however, is that the proposed set-up of the hybrid bearing is not feasible due to the effect of cell exclusion, which causes the SGB to operate on a reduced viscosity. The reduction in viscosity reduces the load capacity of the SGB; the magnetic preload on the impeller cannot be balanced by the chosen SGB geometry. Recommendations have been made as to the design parameters that may be altered such that the design intent of the proposed system may be realised. Future work must concentrate on the realization of that design intent through the manufacture of a prototype, which can provide a proof-of-concept for the proposed system. The work presented here provides a feasibility study for the novel hybrid bearing / drive system and provides sound foundation upon which a prototype may be based.
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Ambrogi, Robert R. (Robert Raymond). "Testing and analysis of hybrid magnetic bearings." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14815.
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Lee, Ying-Tsun, and 李應村. "Control Design on the Hybrid Magnetic-Aerostatic Thrust Bearing." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/34842575103772203552.
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碩士中原大學
機械工程研究所
96
Recently, the demand of the precision device is reaching the sub-micrometer level, the requirement for the bearing is not only needs larger load capacity but also needs higher stiffness coefficient. The aim of the research is to design and develop an aerostatic-magnetic hybrid bearing system. The system mainly utilizes the advantages of the two kinds of non-contact bearings. The aerostatic bearing provides the main function to supply supporting force to the rotating shaft, and the active magnetic bearings with the controller are applied to stabilize the operational condition, using electromagnetic force to suspend gravity and isolate vibration force from the system. The axial force is derived and modified to analyze the influences of the design and operational parameters of the aerostatic-magnetic hybrid bearing on the load capacity and the stiffness. Then the dynamic model of the overall system is established and analyzed. Next, a sliding mode controller which system would not be affected completely by parameter uncertainties and external disturbances is designed to regulate the attitude in this system. So this research chooses sliding mode controller and compares with the traditional PD controller in order to choose the more applicable controller. Simulation of this research is divided into two parts of steady state and joining the external force interfering with stability. From the simulation result can demonstrate that joining a magnetism system with sliding mode controller can make system have better damping coefficient and larger load capacity, and improve the stability of the system effectively.
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Wu, Hsien-Da, and 吳賢達. "Improvement of Rotor Axial Position Sensing in a Hybrid Magnetic Bearing." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/44037256764798567030.
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碩士淡江大學
機械與機電工程學系碩士班
96
This paper presented a prototype axial blood pump with a single-axis controlled magnetic bearing. The magnetic suspension system is realized by using passive magnetic bearings for radial direction balancing, and an electromagnetic actuator to stabilize the axial direction actively. Four methods for measuring axial position of the rotor are presented. Their measurement errors are analyzed with finite element analysis and verified experimentally. The rotor has an inner impeller structure to accommodate fluid flow, and it is driven by a brushless DC motor. A prototype pump was built and tested both in air and in water. The experimental results demonstrated successful pump operations. The rotor can be stably levitated in the air gap.
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Chen, Yi-Ta, and 陳奕達. "Design and Development of Hybrid Magnetic-Aerostatic Bearing and Performance Investigation." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/94691652049825971330.
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碩士國立臺灣大學
機械工程學研究所
94
The aim of the thesis is to design and develop a micro aerostatic-magnetic hybrid bearing. The aerostatic bearing provides the main function to supply supporting force to the rotating shaft, and the magnetic levitation principle is applied to stabilize the operational condition of aerostatic bearing. For achieving high load capacity and stability, the sleeve type shaft is developed for the aerostatic bearing; the two NdFeB magnets are used in the magnetic device to produce the axial pre-load on the aerostatic bearing for realizing a stable and optimal air gap. Besides the combination of the aerostatic and the magnetic principles, a short-shaft bearing and a long-shaft bearing are designed and developed to study the influences of the geometric sizes and the structural arrangement on the performance. For generating high speed spindle’s rotation, an air turbine driven by the high pressured air jet is developed and integrated with the hybrid bearing. The Reynold’s equation is derived and modified to analyze the influences of the design and operational parameters of the aerostatic bearing on the load capacity and the stiffness. Furthermore, the 3-D finite element software FLUENT is utilized to investigate the detailed influential effects of the design parameters. For developing and optimizing the magnetic device, the magnetic-circuit method and the Maxwell electromagnetic simulation software are used to analyze the influences of the arrangement and the geometric dimensions of the magnets on the magnetic pre-load. The main testing items for the hybrid bearing are load capacity, stiffness, vibration and rotating speed, which are measured to verify the effects of the influential parameters.
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Φαρμακόπουλος, Μιχαήλ. "Σχεδιασμός υβριδικού εδράνου ολίσθησης (υδροδυναμικού - ηλεκτρομαγνητικού)." Thesis, 2015. http://hdl.handle.net/10889/8525.
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Η παρούσα διδακτορική διατριβή αναφέρεται σε έδρανα ολίσθησης. Συγκεκριμένα, αναφέρεται στο σχεδιασμό και την κατασκευή ενός νέου, πρωτότυπου υβριδικού εδράνου ολίσθησης, το οποίο έχει τη δυνατότητα να λειτουργεί είτε ως υδροδυναμικό, είτε ως ενεργό ηλεκτρομαγνητικό, είτε ως υβριδικό, δηλαδή υδροδυναμικό και ενεργό ηλεκτρομαγνητικό ταυτόχρονα.
Προκειμένου να πραγματοποιηθεί ο σχεδιασμός και η κατασκευή του συγκεκριμένου υβριδικού εδράνου ολίσθησης, έγιναν υπολογισμοί και προσομοίωση του υδροδυναμικού πεδίου για τα υδροδυναμικά έδρανα ολίσθησης και του ηλεκτρομαγνητικού πεδίου για τα ηλεκτρομαγνητικά έδρανα στο πρόγραμμα ANSYS. Η προσομοίωση των υβριδικών εδράνων ολίσθησης έγινε με επαναληπτική διαδικασία μεταξύ του υδροδυναμικού και του ηλεκτρομαγνητικού πεδίου προκειμένου να υπολογίζεται το κάθε επιθυμητό μέγεθος.
Για το σχεδιασμό του υβριδικού εδράνου ολίσθησης χρησιμοποιήθηκε το σχεδιαστικό πρόγραμμα CATIA.
Για την προσομοίωση του ελέγχου του υβριδικού εδράνου ολίσθησης, χρησιμοποιήθηκε το πρόγραμμα Matlab, το οποίο ενεργοποιεί το πρόγραμμα Ansys για τον υπολογισμό των χαρακτηριστικών του υδροδυναμικού και του ηλεκτρομαγνητικού πεδίου του εδράνου και το Simulink module του Matlab για τον υπολογισμό των χαρακτηριστικών του ελέγχου, ώστε να γίνονται όλοι οι απαραίτητοι υπολογισμοί αυτοματοποιημένα.
Τέλος, έγιναν υπολογισμοί και προσομοίωση δυναμικής περιστρεφόμενων αξόνων, με στήριξη του ρότορα σε δύο έδρανα και δίσκο προσαρμοσμένο στον ρότορα, στο πρόγραμμα Matlab, με σύνδεση με το Ansys για τον υπολογισμό των συντελεστών ελαστικότητας και απόσβεσης και το Simulink module του Matlab για τον υπολογισμό των χαρακτηριστικών του ελέγχου, με σκοπό την ολοκληρωμένη ανάλυση του συστήματος.
Συμπερασματικά, μέσω της συγκεκριμένης διδακτορικής διατριβής αποδεικνύεται πως ο σχεδιασμός, η λειτουργία και η κατασκευή του συγκεκριμένου πρωτότυπου υβριδικού εδράνου ολίσθησης είναι εφικτά, και από τα αποτελέσματα προκύπτει πως η λειτουργία ενός τέτοιου υβριδικού εδράνου ολίσθησης, έχει πολλά πλεονεκτήματα σε σχέση με άλλα έδρανα στήριξης περιστρεφόμενων αξόνων, είτε αυτά είναι απλά είτε υβριδικά και μπορεί να εφαρμοστεί είτε σε εργαστηριακό επίπεδο είτε σε βιομηχανικές εφαρμογές.The present doctoral thesis refers to hydrodynamic journal bearings. Specifically, it refers to the design and construction of a new, innovative hybrid journal bearing, which has the ability to function either as hydrodynamic or active magnetic or hybrid, i.e. both hydrodynamic and active magnetic, at the same time. In order to be performed the design and construction of the specific hybrid journal bearing, calculations and simulation of the hydrodynamic field for the hydrodynamic journal bearings in the program ANSYS, have been made. The simulation of the hybrid journal bearings has been made with iterative process, between the hydrodynamic and active magnetic field, so that every desired magnitude can be calculated. For the design of the hybrid journal bearing, the designing program CATIA has been used. For the simulation of the control of the hybrid journal bearing, the program Maltab has been used, which activates the program Ansys, for the calculation of the features of the hydrodynamic and active magnetic field of the bearing and the Simulink module of Maltab, for the calculation of the features of control, so that all necessary calculations can be made automated. Finally, calculations and simulation of rotor dynamics, with support of the rotor in two bearings and disc adjusted to the rotor, in Maltab, in connection to Ansys, for the calculation of the elastic and damping coefficients and the Simulink module of Maltab, for the calculation of the features of control, have been made, having as a purpose the complete analysis of the system. In conclusion, through the specific doctoral thesis, it is proved that the design, function and construction of the specific, new hybrid journal bearing, can be achieved and the results show that the function of such a hybrid journal bearing, has many advantages compared to other bearings of support of rotors, either they are simple or hybrid and it can be applied either to laboratory level or industrial applications.
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Chang, Chia-Lun, and 張家綸. "The Characteristics Study of Bilateral Oil Magnetic Hybrid Hydrodynamic Bearings Rotor System in Low Speed." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/bx78pc.
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碩士中原大學
機械工程研究所
102
The spindles need to use the bearings to suspense the rotor in the rotating machines. In these bearing systems, the fluid hydrodynamic bearings with low noise, high precision, low vibration, long lifetime, and suitable running in the long time operation are more commonly be used in the heavy load system or the long time operation systems.The load capacity of the fluid hydrodynamic bearings as starting or operating at low speed are very small. The phenomenon of dry rub in the bearing and journal will occur and would damage the rotor system. Therefore, in this study, we wish to propose a passive magnetic bearing to combine with the fluid hydrodynamic bearings to improve the drawback to make the magnet-fluid hybrid hydrodynamic bearings could maintain better characteristics as the rotor system is starting or operating at low speed. In this study, the goal is to improve the load capacity of the fluid hydrodynamic bearings by an auxiliary magnetic force from the permanent magnets to promote the lifetime of bearings. Several combination types of the permanent magnets were proposed. By simulation analysis of the magnetic field, the relationship of magnetic forces and positions of magnets can be calculated. Then we can design a suitable passive magnetic bearing on hydrodynamic bearing to be a hybrid bearing to support the rotor. The hybrid bearing can provide magnetic forces to support the spindle suspending in the hydrodynamic bearing with a little gapes. It will make the rotor and the stator would not contact as they are not running or at a low running speed. Thus there have no dry friction in the bearing and the lifetime of the bearing will be promoted. Keywords: Fluid Hydrodynamic Bearings, Passive Magnetic Bearing, Magnet-Fluid Hybrid Hydrodynamic Bearings.
Books on the topic "Hybrid magnetic bearing"
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V, Brown Gerald, and United States. National Aeronautics and Space Administration., eds. Performance tests of a cryogenic hybrid magnetic bearing for turbopumps. Washington, DC: National Aeronautics and Space Administration, 1992.
Find full textBook chapters on the topic "Hybrid magnetic bearing"
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Jeong, Sena, Bok Seong Choe, and Yong Bok Lee. "Rotordynamic Behavior and Performance of Controllable Hybrid Foil-Magnetic Bearing." In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 1465–76. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_120.
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Xia, Zule, Ki Ma, Quark Chen, Rodger Cooley, Paul Fowler, and Wei-Kan Chu. "Hybrid Superconducting Magnetic Bearing for Kinetic Energy Storage Applications and its Frictional Energy Loss." In A Cryogenic Engineering Conference Publication, 983–90. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0373-2_126.
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Komori, Mochimitsu, and Shinya Matsuoka. "Bias-current’s effect on Hybrid superconducting Magnetic Bearings." In Advances in Superconductivity XI, 1345–48. Tokyo: Springer Japan, 1999. http://dx.doi.org/10.1007/978-4-431-66874-9_315.
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Meng, Lim Tau, and Cheng Shanbao. "Development of Hybrid Magnetic Bearings System for Axial-Flow Blood Pump." In Lecture Notes in Electrical Engineering, 391–400. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-74905-1_28.
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Bekinal, Siddappa Iranna, Tumkur Ramakrishna rao Anil, Sadanand Subhas Kulkarni, and Soumendu Jana. "Hybrid Permanent Magnet and Foil Bearing System for Complete Passive Levitation of Rotor." In Mechanisms and Machine Science, 939–49. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09918-7_83.
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Ohashi, Shunsuke, Takuya Ito, and Yoshihisa Hirane. "The Basic Characteristics of the Pinning Force and Flux Density Distribution of the HTSC-Permanent Magnet Hybrid Bearing." In Advances in Superconductivity XII, 794–96. Tokyo: Springer Japan, 2000. http://dx.doi.org/10.1007/978-4-431-66877-0_234.
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Fang, J., L. Lin, and L. Yan. "Study on a Hybrid Superconducting Magnetic Bearing System." In Proceedings of the Twentieth International Cryogenic Engineering Conference (ICEC20), 657–60. Elsevier, 2005. http://dx.doi.org/10.1016/b978-008044559-5/50156-3.
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Ichikawa, Osamu. "Homopolar, hybrid and consequent-pole bearingless motors." In Magnetic Bearings and Bearingless Drives, 274–86. Elsevier, 2005. http://dx.doi.org/10.1016/b978-075065727-3/50017-1.
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Fan, Yi-Hua, Liao-Yong Lou, and Hsiang-Jung Chang. "Study on the characteristics of oil-magnet hybrid hydrodynamic bearing at low speed." In Applied System Innovation, 451–55. CRC Press, 2016. http://dx.doi.org/10.1201/b21811-94.
Full textConference papers on the topic "Hybrid magnetic bearing"
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Kupka, Tomas, and Jiri Pavelka. "Realization of hybrid magnetic bearing." In 2012 EPE-ECCE Europe Congress. IEEE, 2012. http://dx.doi.org/10.1109/epepemc.2012.6397224.
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Tian, Ye, Yanhua Sun, and Lie Yu. "Steady-State Control of Hybrid Foil-Magnetic Bearings." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68394.
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A hybrid foil-magnetic bearing is combination of a foil bearing and a magnetic bearing, which takes advantages of both bearings while compensating each other the weaknesses. It is a solution of friction and wear of foil bearings at low speeds and limited load capacity of magnetic bearings. Furthermore, load sharing and control of dynamics can be achieved in a hybrid foil-magnetic bearing. However, in the hybrid foil-magnetic bearing, the journal should run at certain eccentricity and attitude angle in order to take part of the loads, but the magnetic bearing would attempt to force the journal to the reference position at all times while using a conventional PID controller. Therefore, it is necessary to design a new control algorithm to overcome the contradictions. In this paper, the steady-state characteristics of a hybrid foil-magnetic bearing were analyzed. Then a searching algorithm was presented and a steady-state controller was designed to determine the steady-state working position of the hybrid foil-magnetic bearings. Finally, simulations were done to verify performances of the searching algorithm and designed steady-state controller, and the results show its validity.
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Heshmat, Hooshang, H. Ming Chen, and James F. Walton. "On the Performance of Hybrid Foil-Magnetic Bearings." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-376.
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Recent technological advancements make hybridization of the magnetic and foil bearings both possible and extremely attractive. Operation of the foil/magnetic bearing takes advantage of the strengths of each individual bearing while minimizing each others weaknesses. In this paper one possible hybrid foil and magnetic bearing arrangement is investigated and sample design and operating parameters are presented. One of the weaknesses of the foil bearings, like any hydrodynamic bearing, is that contact between the foil bearing and the shaft occurs at rest or at very low speeds and it has low load carrying capacity at low speeds. For high speed applications, AMBs are, however, vulnerable to rotor-bending or structural resonances that can easily saturate power amplifiers and make the control system unstable. Since the foil bearing is advantageous for high speed operation with a higher load carrying capacity, and the magnetic bearing is so in low speed range, it is a natural evolution to combine them into a hybrid bearing system thus utilizing the advantages of both. To take full advantage of the foil and magnetic elements comprising a hybrid bearing, it is imperative that the static and dynamic characteristics of each bearing be understood. This paper describes the development of a new analysis technique that was used to evaluate the performance of a class of gas-lubricated journal bearings. Unlike conventional approaches, the solution of the governing hydrodynamic equations dealing with compressible fluid is coupled with the structural resiliency of the bearing surfaces. The distribution of the fluid film thickness and pressures, as well as the shear stresses in a finite-width journal bearing, are computed. Using the Finite Element (FE) method, the membrane effect of an elastic top foil was evaluated and included in the overall analytical procedure. Influence coefficients were generated to address the elasticity effects of combined top foil and elastic foundation on the hydrodynamics of journal bearings, and were used to expedite the numerical solution. The overall program logic proved to be an efficient technique to deal with the complex structural compliance of various foil bearings. Parametric analysis was conducted to establish tabulated data for use in a hybrid foil/magnetic bearing design analysis. A load sharing control algorithm between the foil and magnetic elements is also discussed.
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Swanson, Erik E., Hooshang Heshmat, and James Walton. "Performance of a Foil-Magnetic Hybrid Bearing." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0411.
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To meet the advanced bearing needs of modern turbomachinery, a hybrid foil-magnetic hybrid bearing system was designed, fabricated and tested in a test rig designed to simulate the rotor dynamics of a small gas turbine engine (31 kN to 53 kN thrust class). This oil-free bearing system combines the excellent low and zero-speed capabilities of the magnetic bearing with the high load capacity and high speed performance of the compliant foil bearing. An experimental program is described which documents the capabilities of the bearing system for sharing load during operation at up to 30,000 RPM and the foil bearing component’s ability to function as a back-up in case of magnetic bearing failure. At an operating speed of 22,000 RPM, loads exceeding 5300 N were carried by the system. This load sharing could be manipulated by an especially designed electronic control algorithm. In all tests, rotor excursions were small and stable. During deliberately staged magnetic bearing malfunctions, the foil bearing proved capable of supporting the rotor during continued operation at full load and speed, as well as allowing a safe rotor coast-down. The hybrid system tripled the load capacity of the magnetic bearing alone and can offer a significant reduction in total bearing weight compared to a comparable magnetic bearing.
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Russell, Thomas E., Crystal Heshmat, and Dennis Locke. "Hybrid Magnetic/Foil Bearing System for an Oil-Free Thrust Bearing Test Rig." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0025.
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A novel, high-speed, high temperature, oil-free, foil thrust bearing test rig has been developed with a critical element being a double-acting, active magnetic thrust bearing. The magnetic thrust bearing is used to react against loads applied to the foil thrust bearing under test. The magnetic bearing has the capability of reacting against thrust loads of up to 2224 N (500 pounds) at speeds to 80,000 rpm, while the rotor is supported by foil journal bearings. Two issues that are especially challenging for this test rig are magnetic material selection and the electronic control system. The magnetic material selection is critical due to the high centrifugal stresses that occur at 80,000 rpm. The electronic control system must handle the non-linear variation in stiffness and damping that is seen by the magnetic thrust bearing as the foil thrust bearing is loaded, as well as maintain rotor system stability as the foil bearing is purposefully overloaded to the point of failure to discover maximum load and performance capabilities. This paper describes the design of the active magnetic thrust bearing, the material selection process, and the development of a digital signal processor based control system. Typical experimental data obtained during operation of the test rig will also be presented.
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Wang, Shih-Chun, and Kuang-Yuh Huang. "Magnetic-Aerostatic Hybrid Bearing for Mini-Type High-Speed Air Turbine Cartridge." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46513.
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Under the development trend of high speed and high efficiency, mini-type air turbines have been widely applied to high-speed dental handpieces for decades. Bearing is the key component deciding efficiency of mini-type air turbine. Friction, collision and wear are the main causes to let the traditional ball and roller bearing not be able to reach higher efficiency. Although aerostatic bearing can realize very small sliding friction, but its weak bearing characteristic limits its application. In our research, we combined a magnetic levitation bearing with an aerostatic bearing to create a novel magnetic-aerostatic hybrid bearing, which can significantly promote the mini-type air turbine in a dental handpiece to achieve a better high-speed performance. The aerostatic bearing undertakes the function of radial bearing, and the magnetic levitation is responsible for the thrust bearing. The aerostatic bearing utilizes a composite orifice form with a large depth to width aspect ratio that can be realized by simple machining process. Its radial arranged orifices provide the spindle a sufficient and uniform radial support with high pressured air film. In consideration of operational safety and size constraint of the dental handpiece, the passive magnetic levitation method with repulsive NdFeB magnet rings is adopted for the thrust bearing. For comprehending their characteristics of the aerostatic and the magnetic levitation bearings, the finite element analytical method is employed to investigate the relationship between system parameters and performance and also to deduce the optimal construction for the prototype development. Our developed magnetic-aerostatic hybrid bearing is also experimentally approved to be able to provide stable and sustainable bearing capacity under low air pressure condition.
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Wajnert, Dawid, and Bronislaw Tomczuk. "Thermal analysis of a hybrid magnetic bearing." In 2017 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (ISEF). IEEE, 2017. http://dx.doi.org/10.1109/isef.2017.8090742.
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Park, Cheol Hoon, Jun Young Park, and Eui Soo Yoon. "Design and Evaluation of Hybrid Magnetic Bearings for Turbo Compressors." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75273.
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Recently, high capacity and high efficiency turbo machines such as turbo blowers and turbo compressors have been being developed. To keep up with this trend, magnetic bearings are increasingly being applied to turbo machines instead of air foil bearings. In this study, a hybrid magnetic bearing composed of a permanent magnet and an electromagnet was applied to 300-HP (horsepower) turbo compressors with rated speeds of 50,000 rpm. The length of the shaft should be reduced as short as possible so that the compressor rotor can rotate stably while maintaining a small vibration at a rotation speed of 50,000 rpm. In this study, the additional shaft length for the axial gap sensor is eliminated by applying a new layout in which the axial gap sensor is placed on the inner surface of the thrust magnetic bearing. No-load tests and full-load tests in the manufactured turbo compressors were performed to evaluate the performance of the designed magnetic bearings. The biggest obstacle to this development is the heat problems caused by compressor impellers and high-speed motors. Thanks to the cooling system using water and air, the problem of thermal expansion of the rotor in the axial direction can be avoided. Thrust forces were estimated using the control current for thrust magnetic bearings. The experiment is also performed to evaluate the vibration of each turbo compressor and the results are presented. Based on the evaluated vibration, it has been confirmed that the hybrid magnetic bearings and the new axial gap sensor layout can support the turbo compressors stably.
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Hirani, H., and P. Samanta. "Performance Evaluation of Magnetohydrodynamic Bearing." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63608.
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The present paper introduces a concept of hydrodynamic-permanent-magnetic hybrid bearing. The hybrid bearing uses repulsive force between permanent magnets and fluid force developed due to relative speed in a single assembly arrangement. Repulsive type passive magnetic levitation has advantage of minimum starting torque. Hydrodynamic lubrication mechanism has advantage of low friction at medium and high speed. This hybridization will be an attractive choice in commercial applications for its low cost, structural-simplicity and no metal-to-metal contact. An experimental setup is designed and developed to investigate the performance characteristics of proposed concept of hybrid bearing. Minimum film thickness, oil flow rate, and temperature rise are recorded at various speed- and load- conditions. Results are plotted to demonstrate the behavior of hybrid bearing arrangement.
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Shupei Li, Liwei Song, Jingyu Wang, Size Li, and Xiaofei Lei. "Decoupling active and passive hybrid radial magnetic bearing." In 2015 International Conference on Control, Automation and Information Sciences (ICCAIS). IEEE, 2015. http://dx.doi.org/10.1109/iccais.2015.7338640.
Full textReports on the topic "Hybrid magnetic bearing"
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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.
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