Thematische Bibliographien / Magnetická levitace

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Auswahl der wissenschaftlichen Literatur zum Thema „Magnetická levitace“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Magnetická levitace"

Saroja, Gancang. „Magnetic Levitation for Diamagnetic Material Density Measurement: Theoretical Studies“. Natural-B 3, Nr. 3 (01.04.2014): 277–80. http://dx.doi.org/10.21776/ub.natural-b.2014.002.03.12.

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Dijkstra, Camelia E., Oliver J. Larkin, Paul Anthony, Michael R. Davey, Laurence Eaves, Catherine E. D. Rees und Richard J. A. Hill. „Diamagnetic levitation enhances growth of liquid bacterial cultures by increasing oxygen availability“. Journal of The Royal Society Interface 8, Nr. 56 (29.07.2010): 334–44. http://dx.doi.org/10.1098/rsif.2010.0294.

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Diamagnetic levitation is a technique that uses a strong, spatially varying magnetic field to reproduce aspects of weightlessness, on the Earth. We used a superconducting magnet to levitate growing bacterial cultures for up to 18 h, to determine the effect of diamagnetic levitation on all phases of the bacterial growth cycle. We find that diamagnetic levitation increases the rate of population growth in a liquid culture and reduces the sedimentation rate of the cells. Further experiments and microarray gene analysis show that the increase in growth rate is owing to enhanced oxygen availability. We also demonstrate that the magnetic field that levitates the cells also induces convective stirring in the liquid. We present a simple theoretical model, showing how the paramagnetic force on dissolved oxygen can cause convection during the aerobic phases of bacterial growth. We propose that this convection enhances oxygen availability by transporting oxygen around the liquid culture. Since this process results from the strong magnetic field, it is not present in other weightless environments, e.g. in Earth orbit. Hence, these results are of significance and timely to researchers considering the use of diamagnetic levitation to explore effects of weightlessness on living organisms and on physical phenomena.

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Mishra, Rajat, Himashu Sharma und Harshit Mishra. „High-speed vacuum air vehicle“. Transportation Systems and Technology 4, Nr. 3 suppl. 1 (19.11.2018): 328–39. http://dx.doi.org/10.17816/transsyst201843s1328-339.

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Background: There are a number of problems in the prior art, those are topics of research inputs likes ranges of the drag force generated by the vehicle, lift force at high vehicle motion velocities for compensation of the vehicle weight, Aerodynamic aspects of operation of the vehicle, Aim: Stream wise stability of vehicle motion and levitation and breaking of the vehicles and supersonic speed is not achieved in any mode of transportation. But this present invention related to high speed magnetic levitating transportation. More particularly, present invention is related to high speed magnetic levitating transportation using compressed air chamber in the transportation vehicle. Methods: The present invention is more particularly related to high speed vehicle levitated on a vacuum tunnel by using electromagnetic levitation. As this vehicle will move from one place to another in a vacuum environment and this vehicle will levitate above track with the help of electromagnets. Results: The important thing is its motion, which is possible due to reaction force of high pressure air, coming out from compressed air chamber present in vehicle. Conclusion: It can give us the acceleration as per load requirement and it can achieve supersonic speed in few seconds.

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Saroja, Gancang, Suyatman Suyatman und Nugraha Nugraha. „Magnetic Levitation for Separation of Plastic Polyethylene Terephthalate (PET) and Polyvinyl Chloride (PVC)“. Natural B 1, Nr. 4 (01.10.2012): 337–42. http://dx.doi.org/10.21776/ub.natural-b.2012.001.04.6.

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Sutoko, Sutoko. „SISTEM KENDALI LEVITASI MAGNETIK REPULSIF MENGGUNAKAN METODE PROPORTIONAL-INTEGRAL-DERIVATIVE (PID)“. Jurnal Teknologi Terapan: G-Tech 4, Nr. 2 (30.04.2021): 334–39. http://dx.doi.org/10.33379/gtech.v4i2.634.

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Sifat dasar kemagnetan membuat teknik levitasi menjadi dimungkinkan, namun terdapat perbedaan mendasar jika dibandingkan dengan sifat kelistrikan. Pada interaksi antar muatan listrik, diketahui bahwa muatan yang sama akan saling menolak, sementara muatan yang berlawanan akan saling menarik. Karena adanya muatan listrik bersih, maka levitasi elektris bisa dimungkinkan. Pada interaksi magnetis dimungkinkan melakukan levitasi dengan lebih mudah melalui modifikasi medan magnet. Modifikasi ini bisa dilakukan melalui sistem kendali dan perangkat elektromagnet, seperti induktor. Tanpa sistem kendali, levitasi magnetis hanya bisa dilakukan menggunakan bahan diamagnetis. Saat ini bahan diamagnetis yang memiliki efek paling besar adalah superkonduktor. Selain mahal, temperatur superkonduktor harus dibuat sangat rendah sehingga tidak praktis dipakai dalam teknik levitasi. Pada penelitian ini akan dikembangkan sebuah teknik levitasi magnetis yang bersifat repulsif menggunakan sistem kendali proportional-integral-derivative (PID). Sistem yang dikendalikan berupa kekuatan efektif elektromagnet dalam menstabilkan objek yang ditolak oleh kutub magnet permanen sehingga tetap berada pada posisi dan orientasi yang sama. Hasil yang telah didapatkan adalah proses levitasi magnetik repulsif berhasil secara optimum mempertahankan objek magnet neodimium dengan ketinggian 4 mm selama 5 detik menggunakan nilai Kp sebesar 1 dan nilai Kd sebesar 1,5.

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Miyatake, Yoshihito, Mochimitsu Komori, Ken-ichi Asami und Nobuo Sakai. „Trial Application of Pulse-Field Magnetization to Magnetically Levitated Conveyor System“. Advances in Condensed Matter Physics 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/561657.

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Magnetically levitated conveyor system using superconductors is discussed. The system is composed of a levitated conveyor, magnetic rails, a linear induction motor, and some power supplies. In the paper, pulse-field magnetization is applied to the system. Then, the levitation height and the dynamics of the conveyor are controlled. The static and dynamic characteristics of the levitated conveyor are discussed.

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Nakashima, Hidetaka, Tatsuya Nakasaki, Tatsuhiro Tanaka, Yushi Kinoshita, Yuki Tanaka, Panart Khajornrungruang, Edmund Soji Otabe und Keisuke Suzuki. „Study on Polishing Method Using Magnetic Levitation Tool in Superconductive-Assisted Machining“. International Journal of Automation Technology 15, Nr. 2 (05.03.2021): 234–42. http://dx.doi.org/10.20965/ijat.2021.p0234.

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Superconductive-assisted machining (SUAM) is a polishing method that employs a magnetic levitation tool, which is based on a superconductive phenomenon called the pinning effect. Since the tool magnetically levitates, the issue of tool interference is eliminated. In this study, in order to set up the polishing conditions of the magnetic levitation tool, we evaluated the relation between the flux density distribution relative to the tool position and the holding force acting on the magnetic levitation tool to maintain its initial position, set by field cooling by the superconducting bulk. For the holding force, we measured the attractive, repulsive, restoring, and driving forces. We found that the greater the holding force, the smaller the initial distance between the superconducting bulk and the magnetic levitation tool. The attractive force was found to peak when the levitated tool was displaced 6 mm from an initial position of 9 mm from the bulk, and it became only the self-weight of the magnetic levitation tool at displacements of 30 mm and above, where the pinning effect broke down. We then evaluated the polishing characteristics for SUS304 and A1100P at a tool displacement that results in the maximum attractive force. In the polishing experiment, we employed a water-based diamond slurry because the temperature of the workpiece was close to room temperature. We found that it was possible to polish SUS304 and A1100P while avoiding the effects of magnetization due to the polishing pressure or induced currents that accompany the rotation of the metal plate. The arithmetic average roughness, Ra, of A1100P was relatively high due to the effect of scratches, while that of SUS304 improved from 92 nm before polishing to 55 nm after polishing when polished with grains with a diameter of 1 μm.

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Osa, Masahiro, Toru Masuzawa, Ryoga Orihara und Eisuke Tatsumi. „Performance Enhancement of a Magnetic System in a Ultra Compact 5-DOF-Controlled Self-Bearing Motor for a Rotary Pediatric Ventricular-Assist Device to Diminish Energy Input“. Actuators 8, Nr. 2 (15.04.2019): 31. http://dx.doi.org/10.3390/act8020031.

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Research interests of compact magnetically levitated motors have been strongly increased in development of durable and biocompatible mechanical circulatory support (MCS) devices for pediatric heart disease patients. In this study, an ultra-compact axial gap type self-bearing motor with 5-degrees of freedom (DOF) active control for use in pediatric MCS devices has been developed. The motor consists of two identical motor stators and a centrifugal levitated rotor. This paper investigated a design improvement of the magnetic circuit for the self-bearing motor undergoing development in order to diminish energy input by enhancing magnetic suspension and rotation performances. Geometries of the motor were refined based on numerical calculation and three-dimensional (3D) magnetic field analysis. The modified motor can achieve higher suspension force and torque characteristics than that of a previously developed prototype motor. Oscillation of the levitated rotor was significantly suppressed by 5-DOF control over rotating speeds up to 7000 rpm with lower energy input, indicating efficacy of the design refinement of the motor.

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Kecik, Krzysztof, und Andrzej Mitura. „Theoretical and Experimental Investigations of a Pseudo-Magnetic Levitation System for Energy Harvesting“. Sensors 20, Nr. 6 (14.03.2020): 1623. http://dx.doi.org/10.3390/s20061623.

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The paper presents an analytical, numerical and experimental analysis of the special designed system for energy harvesting. The harvester system consists of two identical magnets rigidly mounted to the tube’s end. Between them, a third magnet is free to magnetically levitate (pseudo-levitate) due to the proper magnet polarity. The behaviour of the harvester is significantly complicated by a electromechanical coupling. It causes resonance curves to have a distorted shape and a new solution from which the recovered energy is higher is observed. The Harmonic Balance Method (HBM) is used to approximately describe the response and stability of the mechanical and electrical systems. The analytical results are verified by a numerical path following (continuation) method and experiment test with use of a shaker. The influence of harvester parameters on the system response and energy recovery near a main resonance is studied in detail.

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Etxaniz, Iñigo, Alberto Izpizua, Manex San Martin und Joseba Arana. „Magnetic Levitated 2D Fast Drive“. IEEJ Transactions on Industry Applications 126, Nr. 12 (2006): 1678–81. http://dx.doi.org/10.1541/ieejias.126.1678.

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Dissertationen zum Thema "Magnetická levitace"

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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Jančuš, Rastislav. „Magneticky levitující vozítko“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220903.

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Diploma thesis is summarizing common theoretical knowledge about permanent magnets and electromagnetism. Represent DC electromagnet as basic part for levitated high-speed train. Work is analyzing basics under cart and principles used for magnetic levitation in high-speed transportation. Second practice part including projecting construction levitated cart and analyzing acquired mathematical model of electromagnet. Work is analyzing process for projecting control for side electromagnets and realization real model, including tuning computer communication with states of sensors and comparison real model with model simulated in program Simulink.

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Coppock, Joyce Elizabeth. „Optical and Magnetic Measurements of a Levitated, Gyroscopically Stabilized Graphene Nanoplatelet“. Thesis, University of Maryland, College Park, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10641221.

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I discuss the design and operation of a system for levitating a charged, μm-scale, multilayer graphene nanoplatelet in a quadrupole electric field trap in high vacuum. Levitation decouples the platelet from its environment and enables sensitive mechanical and magnetic measurements.

First, I describe a method of generating and trapping the nanoplatelets. The platelets are generated via liquid exfoliation of graphite pellets and charged via electrospray ionization. Individual platelets are trapped at a pressure of several hundred mTorr and transferred to a trap in a second chamber, which is pumped to UHV pressures for further study. All measurements of the trapped platelet's motion are performed via optical scattering.

Second, I present a method of gyroscopically stabilizing the levitated platelet. The rotation frequency of the platelet is locked to an applied radio frequency (rf) electric field E_rf. Over time, frequency-locking stabilizes the platelet so that its axis of rotation is normal to the platelet and perpendicular to E_rf.

Finally, I present optical data on the interaction of a multilayer graphene platelet with an applied magnetic field. The stabilized nanoplatelet is extremely sensitive to external torques, and its low-frequency dynamics are determined by an applied magnetic field. Two mechanisms of interaction are observed: a diamagnetic polarizability and a magnetic moment proportional to the frequency of rotation. A model is constructed to describe this data, and experimental values are compared to theory.

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Craig, David. „Modeling and Control of a Magnetically Levitated Microrobotic System“. Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2844.

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Magnetically levitated microrobotic systems have shown a great deal of promise for micromanipulation tasks. A new large-gap magnetic suspension system has recently been developed at the University of Waterloo in order to develop microrobotic systems for various applications. In order to achieve motion with the system, a model is needed in order to facilitate the design of various aspects of the system, such as the microrobot and the controller. In order to derive equations of motion for the system attempts were made to characterize the force produced by the magnetic drive unit in terms of a simple analytical equation. The force produced by the magnetic drive unit was estimated with the aid of a finite element model. The derived equations were able to predict the general trend of the force curves, and with sufficient parameter tweaking the error between the force estimated by the finite element model and the force estimated by the analytical equation could be minimized. System models describing the motion of the system in the horizontal and vertical directions are identified and compared to the actual system response. The vertical position response is identified through a least squares parameter estimate of the closed loop response combined with a partial reconstruction of the root locus diagram, with the model structure based on the known dynamics of a simplified form of magnetic levitation. This model was able to provide a reasonable prediction of the system response for a variety of PID controllers under a variety of input conditions. The horizontal models are identified using a least-squares parameter estimate of the open loop characteristics of the system. The horizontal models are able to provide a reasonable prediction of the system response under PD and PID control. Full spatial motion of a microrobot prototype is demonstrated over a working range of 20x22x30 mm³, with PID controller parameters and reference trajectories adjusted to minimize disturbances. The RMS error at steady state is on the order of 0. 020 mm for vertical positioning and 0. 008 mm for horizontal positioning. A linear quadratic regulator implemented for vertical position control was able to reduce the vertical position RMS error to 0. 014 mm.

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Pavluš, Ondřej. „Návrh elektrodynamického magnetického ložiska“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442790.

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High speed applications demands with a need for lower energy consumption lead to designing new types of bearings. In the last decades magnetic bearing, which would be able to obtain passive stable levitation using regular materials at room temperature, has been searched. This has lead to development of electrodynamic bearing based on eddy currents principle. Currently the electrodynamic bearings are still not fully explored and further research is needed. The aim of the work is to describe the theory about modern magnetic bearing, analysis and design of electrodynamic bearing according to given parameters. The finite element method is used for further analysis and evaluate behaviour of its properties.

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Verma, Shobhit. „Development of novel high-performance six-axis magnetically levitated instruments for nanoscale applications“. Diss., Texas A&M University, 2005. http://hdl.handle.net/1969.1/2602.

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This dissertation presents two novel 6-axis magnetic-levitation (maglev) stages that are capable of nanoscale positioning. These stages have very simple and compact structure that is advantageous to meet requirements in the next-generation nanomanufacturing. The 6-axis motion generation is accomplished by the minimum number of actuators and sensors. The first-generation maglev stage is capable of generating translation of 300 ??m in x, y and z, and rotation of 3 mrad about the three orthogonal axes. The stage demonstrates position resolution better than 5 nm rms and position noise less than 2 nm rms. It has a light moving-part mass of 0.2126 kg. The total power consumption by all the actuators is only around a watt. Experimental results show that the stage can carry, orient, and precisely position an additional payload as heavy as 0.3 kg. The second-generation maglev stage is capable of positioning at the resolution of a few nanometers over a planar travel range of several millimeters. A novel actuation scheme was developed for the compact design of this stage that enables 6-axis force generation with just 3permanent-magnet pieces. Electromagnetic forces were calculated and experimentally verified. The complete design and construction of the second-generation maglev stage was performed. All the mechanical part and assembly fixtures were designed and fabricated at the mechanical engineering machine shop. The single moving part is modeled as a pure mass due to the negligible effect of the magnetic spring and damping. Classical as well as advanced controllers were designed and implemented for closed-loop feedback control. A nonlinear model of the force was developed and applied to cancel the nonlinearity of the actuators over the large travel range. Various experiments were conducted to test positioning, loading, and vibration-isolation capabilities. This maglev stage has a moving-part mass of 0.267 kg. Its position resolution is 4 nm over a travel range of 5 ?? 5 mm in the x-y plane. Its actuators are designed to carry and precisely position an additional payload of 2 kg. Its potential applications include semiconductor manufacturing, micro-fabrication and assembly, nanoscale profiling, and nano-indentation.

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Blumber, Eric Joseph. „Testing of a Magnetically Levitated Rocket Thrust Measurement System Demonstrator for NASA“. Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/33753.

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Existing thrust measurement systems (TMSs) at NASA Stennis Space Center use strain gauges and flux plates to measure forces produced by a test article. Alignment and calibration can take two weeks or more every time a piece of hardware or test article is changed. Cross axis loading is also problematic because it is impossible to perfectly align the flex plates and strain gauges in the thrust direction. In response to these problems, a magnetically levitated thrust measurement system has been proposed and a 300lb capacity demonstrator has been designed and built. In this design, the magnetic bearings work concurrently as support bearings and force measurement devices. The demonstrator consists of a floating frame that is completely levitated within a fixed frame by four support bearings carrying loads in the x- and y-direction and seven thrust bearings carrying loads in the z- or thrust direction. Joe Imlach of Imlach Consulting Engineering designed the demonstrator and magnetic bearing components, while Virginia Tech's role has been the application of the multipoint calibration technique including code development, the implementation of a 128-channel data acquisition system, and the overall test verification of the TMS demonstrator.A turnbuckle assembly and magnetostrictive actuator are used in series with a conventional load cell for static and dynamic testing, respectively. Both current based and flux based force equations were used to measure the reaction forces at the bearings. The static results using the current based equations including the current based fringing equations resulted in accuracies of 93% of full load, while the static results using the flux based equations including the flux based fringing equations resulted in accuracies of 99.5% of full load. These accuracies can be compared to accuracies of 83-90% seen in previous work using magnetic bearings to measure forces by monitoring currents and to accuracies of about 99% in previous work using magnetic bearings to measure forces by monitoring fluxes. All of the improved accuracies were made possible through the implementation of a calibration technique known as the multipoint method and the implementation of a gap dependent fringing correction factor developed by Joe Imlach. The demonstrator was not outfitted with accelerometers so the inertia of the floating frame could not be accounted for, limiting the scope of dynamic testing. However, the tests confirmed the ability of the demonstrator to measure dynamic loads in general.
Master of Science

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Huo, Yunlong. „Finite element modeling of internal flow and stability of droplets levitated in electric and magnetic fields“. Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Summer2005/y%5Fhuo%5F083005.pdf.

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Kascak, Peter Eugene. „Fully Levitated Rotor Magnetically Suspended by Two Pole-Pair Separated Conical Motors“. Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1278530250.

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Bergmann, Ryan M. „Characterization of low-frequency electric potential oscillations near the edge of a plasma confined by a levitated magnetic dipole“. Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53240.

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Thesis (S.M. and S.B.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2009.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 95-96).
A vertically adjustable electrostatic probe array was made to observe the previously seen low-frequency angular oscillations in LDX and identify if they are related to computationally expected convective cells. The array rests one meter from the centerline and measures edge fluctuations at field lines near the separatrix. It spans ninety degrees and has 24 probes mounted on it for total probe tip separation of 6.8cm. Bispectral analysis of the fluctuations show that that an inverse cascade of energy is present at times in LDX. The cascade transfers energy from small spatial scale structures to large scale structures. The wavenumber spectrum is xc k-1.4 to cx k-25 at high wavenumbers, which encompasses the inverse energy cascade regime of c k-5/3. The plasma also has a linear dispersion relation which gives a phase velocity of 2-16 k. This phase velocity is inversely correlated with neutral gas pressure in the vessel. The velocity also has a local maximum at 5 pTorr which is the pressure that produces maximum plasma density. The radial E x B drift velocities are observed to have a mean near zero, which indicates a closed structure like a convective cell. The instantaneous radial drift velocities are on the order of the ion sound speed, which is 35 km/s.
by Ryan M. Bergmann.
S.M.and S.B.

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Bücher zum Thema "Magnetická levitace"

International, Conference on Magnetically Levitated Systems (Maglev) (10th 1988 Hamburg Germany). Tenth International Conference on Magnetically Levitated Systems (Maglev), June 9-10, 1988, Congress Centrum Hamburg, Federal Republic of Germany. Berlin: VDE-Verlag, 1988.

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International, Conference on Magnetically Levitated Systems (Maglev) (14th 1995 Bremen Germany). MAGLEV '95: 14th International Conference on Magnetically Levitated Systems : November 26-29, 1995, Hotel Maritim Bremen, Germany. Berlin: VDE-Verlag, 1995.

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United States. Congress. Office of Technology Assessment., Hrsg. New ways: Tiltrotor aircraft and magnetically levitated vehicles. Washington, DC: Congress of the U.S., Office of Technology Assessment, 1991.

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Ramchandran, Ashok. A method for controlling and stabilizing the pitch-axis dynamics of a magnetically levitated train. 1990.

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United States. Maglev Technology Advisory Committee. und United States. Congress. Senate. Committee on Environment and Public Works., Hrsg. Benefits of magnetically levitated high-speed transportation for the United States: Report. Washington: U.S. G.P.O., 1989.

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MAGLEV '95: 14th International Conference on Magnetically Levitated Systems : November 26-29, 1995, Hotel Maritim Bremen, Germany. VDE-Verlag, 1995.

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Buchteile zum Thema "Magnetická levitace"

Murai, Yukio, Katsuhide Watanabe und Youichi Kanemitsu. „Seismic Test on Turbo-Molecular Pumps Levitated by Active Magnetic Bearing“. In Magnetic Bearings, 303–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_28.

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Suzuki, T., H. Suzuki, M. Endo, Y. Yasaka, H. Morimoto, H. Takaichi und M. Murakami. „Fundamental Characteristics of Prototype Ring-Shaped Flywheel Generator with Superconducting Levitated Magnetic Bearing“. In Advances in Superconductivity VI, 1237–42. Tokyo: Springer Japan, 1994. http://dx.doi.org/10.1007/978-4-431-68266-0_280.

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Satow, T., M. Tanaka und T. Ogama. „AC Losses in Multifilamentary Superconducting Composites for Levitated Trains Under AC and DC Magnetic Fields“. In Advances in Cryogenic Engineering, 154–61. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4613-9847-9_17.

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Shimohata, Kenji, Toshie Takeuchi, Shoichi Yokoyama, Hideto Yoshimura, Shirou Nakamura, Tadatoshi Yamada und Shin Utsunomiya. „A Conceptual Design of a Superconducting Magnet for a Magnetic Levitated Train Using a High Tc Oxide Superconducting Wire“. In Advances in Superconductivity IV, 1081–84. Tokyo: Springer Japan, 1992. http://dx.doi.org/10.1007/978-4-431-68195-3_236.

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Okutani, Takeshi, Tsuyoshi Hamada, Yuko Inatomi und Hideaki Nagai. „Properties of p-Si-Ge Thermoelectrical Material Solidified from Undercooled Melt Levitated by Simultaneous Imposition of Static and Alternating Magnetic Fields“. In Solidification of Containerless Undercooled Melts, 425–49. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527647903.ch20.

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Chong, Shin-Horng, Roong-Soon Allan Chan und Norhaslinda Hasim. „Enhanced Nonlinear PID Controller for Positioning Control of Maglev System“. In Control Based on PID Framework - The Mutual Promotion of Control and Identification for Complex Systems. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96769.

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Magnetic levitation (maglev) is a way of using electromagnetic fields to levitate objects without any noise or the need for petrol or air. Due to its highly nonlinear and unstable behavior, numerous control solutions have been proposed to overcome it. However, most of them still acquire precise dynamic model parameters, or deep understanding of control theory. To account the complexity in the design procedure, a practical controller consists of classical and modern control approaches are proposed. This chapter presents a practical controller for high positioning performance of a magnetic levitation system. Three strategies of the proposed controller where the PI-PD controller is to enhance transient response, the model-based feedforward control (FF) is incorporated with the PI-PD controller to enhance the overshoot reduction characteristic in attaining a better transient response, and lastly the disturbance compensator (Kz) is integrated as an additional feedback element to reduce the sensitivity function magnitude for robustness enhancement. The proposed controller - FF PI-PD + Kz has a simple and straightforward design procedure. The usefulness of the proposed controller is evaluated experimentally.

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Tiwari, R., F. Dohnal und R. Markert. „An extended field balancing procedure for flexible rotors fully levitated by active magnetic bearings“. In 10th International Conference on Vibrations in Rotating Machinery, 335–45. Elsevier, 2012. http://dx.doi.org/10.1533/9780857094537.5.335.

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Konferenzberichte zum Thema "Magnetická levitace"

Yu, Ho, und Won-Jong Kim. „Controller Design and Implementation for a 6-DOF Magnetically Levitated Positioner With High-Precision“. In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82556.

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This paper presents the controller design and implementation of a high-precision 6-degree-of-freedom (6-DOF) magnetically levitated (maglev) positioner. This high-precision positioning system consists of a novel concentrated-field magnet matrix and a triangular single-moving part that carries three 3-phase permanent-magnet linear-levitation-motor armatures. Since only a single levitated moving part, namely the platen, generates all required fine and coarse motions, this positioning system is reliable and low-cost. Three planar levitation motors based on the Lorentz-force law not only generate the vertical force to levitate the triangular platen but control the platen’s position and orientation in the horizontal plane. All 6-DOF motions are controlled by magnetic forces only. The platen is regarded a pure mass system, and the spring and damping coefficients are neglected except for the vertical directions. Single-input single-output (SISO) digital lead-lag controllers are designed and implemented on a digital signal processor (DSP). This 6-DOF fully magnetically levitated positioner has a total mass of 5.91 kg and currently exhibits a 120 mm × 120 mm travel range. This positioner is highly suitable for semiconductor-manufacturing applications such as wafer steppers. Several experimental motion profiles are presented to demonstrate the maglev stage’s capability of accurately tracking any planar and 3-D paths.

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Xu, Zhixiang, Zhengjin Feng, Kunisato Seto und Hideyuki Tamura. „Nonlinear Vibration Properties of a Current-Controlled Attractive Type Maglev System“. In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41879.

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Because maglev system has very complicated dynamic properties due to nonlinearity of the magnetic force, it is a very interesting study subject for dynamics researchers. We, in this paper, focused our study interest on a current-controlled attractive type maglev system, and analyzed its nonlinear vibration properties by numerical simulation method. The current-controlled attractive type maglev system is a feedback system based on a PD-controller that adjusts the current of the electromagnet to stably levitate a body with constant gap. The ranges of the system’s feedback gains with which the system will be stable are determined by nonlinear system dynamics analysis. From the numerical simulation results, we found out that when the system is excited by a harmonic motion, the levitated body of the system shows many kinds of vibration phenomena with the variation of the system’s feedback gains in their available ranges. Especially, chaotic vibrations can also occur in this maglev system for some suitable system’s feedback gains.

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Nojoumian, M. A., M. Khodabakhsh und G. R. Vossoughi. „Modeling and Position Control of a Magnetic Levitation System Calculating Eddy Current Based Damping Force“. In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39840.

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In this paper a magnetic levitation system is modeled and an eddy current based damping force is identified and used for position control of the levitated object in the system. In the magnetic levitation technology, contactless manipulation of a levitated object is done by use of magnetic fields. Also, the eddy-current based force is used to damp the motion of the levitated object. Eddy-current is generated in a plate which is placed underneath the levitated object due to the change of current in an electromagnet and the motion of the levitated object. First, using finite element method (FEM), the magnetic levitation system is modeled and the eddy-current based force acting on the levitated object is obtained. The thickness of the plate and the magnetic dipole moment of the levitated object are optimized so that the maximum value of the eddy current based force is gained. The effect of the eddy-current based force on the 2-D motion of the levitated object is studied. Also a controller using the damping effect of the eddy force is designed to control the position of the levitated object in one particular dimension. Results show that the controller can effectively regulate the position of the levitated object.

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Sinha, R., und M. L. Nagurka. „Analog and LabView-Based Control of a Maglev System With NI-ELVIS“. In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81600.

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This paper investigates the control of a low cost vertical-axis maglev system for mechatronics and controls education. The tabletop maglev system consists of an electromagnetic coil that levitates a ferrous object using an infrared sensor to determine the object’s position. Based on the sensor output, the controller adjusts the coil current, thus changing the magnetic field controlling the levitated object’s position. A second electromagnetic coil is used to provide known disturbances. The paper develops the underlying theory for magnetic levitation and presents the results of experiments with classical controllers implemented both as analog circuits and in software-based virtual instruments. Analog controllers, such as PID-type controllers, were implemented as simple circuits on National Instruments’ Educational Laboratory Virtual Instrumentation Suite (NI-ELVIS) prototyping board. NI-ELVIS offers a LabVIEW-based prototyping environment for readily experimenting with different controller circuits. It consists of a multi-function data acquisition device and a custom-designed bench-top workstation with a prototyping board. In addition to analog control circuits, a suite of LabVIEW-based controllers were developed which offer in software a rapid way to change control strategies and gains and explore the effect on the physical system.

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Tachino, K., K. Amei, T. Maeda und M. Sakui. „Characteristics of two-phase levitated linear induction motor“. In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837488.

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Khodabakhsh, Mohammad, Mehran Ebrahimian und Bogdan Epureanu. „Modeling Eddy-Current Damping Force in Magnetic Levitation Systems With Conductors“. In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5164.

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An analytical method is used to develop a model to calculate steady-state eddy-current damping effects in two configurations of magnetic levitation (maglev) systems. The eddy-current based force (eddy-current force) is used for high precision positioning of a levitated permanent magnet in maglev systems. In these systems, the motion of the levitated permanent magnet and changes of the coil’s currents, generate eddy current in the conductors. The proposed analytical model is used to calculate both effects. A conductive cylindrical shell around the levitated object is implemented as a new technique to generate eddy currents in maglev systems. The model is also employed to obtain eddy-current damping effects in a system with a conductive plate beneath the levitated object. The analytical models match results from high fidelity finite element analysis (FEA) with acceptable accuracy in a wide range of operations. Advantages of the two configurations are discussed.

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Hawkins, Larry, Alexei Filatov, Rasish Khatri, Chris DellaCorte und S. Adam Howard. „Design of a Compact Magnetically Levitated Blower for Space Applications“. In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15090.

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Abstract NASA is leading the design and development of a next-generation CO2 removal system, the Four Bed Carbon Dioxide Scrubber (4BCO2), and intends to use the International Space Station (ISS) as its testbed. A key component of the system is the blower that provides the airflow through the CO2 sorbent beds. To improve performance and reliability, magnetic levitation (magnetic bearings) will be used in lieu of more conventional bearings (e.g. ball bearings or air bearings) to improve resistance to contaminants and enable extensibility with regards to blower speed, pressure rise and mass flow rate. The blower will pull air from the ISS through an adsorbing desiccant bed and push it through a CO2 sorbent bed and desorbing desiccant bed. The 4BCO2 blower features an overhung permanent magnet motor, a centrally located five-axis, active magnetic bearing system, backup bearings, and an overhung centrifugal impeller in a very compact package. Magnetic bearings are a natural choice for this application due to low power consumption, low transmitted vibration and oil free operation. This paper describes the design considerations and design selections for the blower system with a focus on the magnetic bearings. Magnetic FEA of the actuator/sensor system, rotordynamics/controls analysis, and backup bearing drop simulations are discussed in detail. It is expected that the successful implementation of magnetic bearings for this space application will encourage the more widespread adoption in other space applications (e.g., fluid pumps, reaction wheels) that challenge conventional bearing technologies.

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Okada, Yohji, Shigenobu Miyamoto, Satoshi Ueno, Tetsuo Ohishi und C. C. Tan. „Levitation and Torque Control of PM Synchronous and Induction Type Bearingless Motor“. In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4032.

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Abstract General solution of levitation control applicable to PM synchronous and induction type rotating motor is presented. It is intended for a single rotor to have both functions of magnetic bearing and rotating motor. The rotational control is achieved with the traditional P pole magnetic flux, while the radial force is controlled with either P+2 or P−2 pole magnetic flux in the stator. In the previous work, the proposed general theory of levitated motor is successfully confirmed with no load experiments. In this paper, the load capability of the levitated motor is tested using a horizontal type experimental setup. The stator has 8 concentrated wound electromagnets, each of which is controlled individually by a DSP and power amplifier. The radial load is the gravity of the rotor, while the produced rotating torque is measured with a noncontact variable torque load system. The results obtained are discussed in detail.

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Ohashi, S., H. Ohsaki und E. Masada. „Effect of the active damper coil system on the lateral displacement of the magnetically levitated bogie“. In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837479.

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Rogers, John, und Robert Rabb. „Control Theory in Practice: Magnetic Levitation“. In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24827.

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A device that levitates a steel ball beneath an electromagnet is used for educational purposes at the United States Military Academy, West Point, New York. Students in the course “Mechatronics” engage in a set of laboratory exercises with the device to reinforce classroom learning. Mechatronics is a senior-level course that introduces the interdisciplinary design of smart systems. Students in the electrical engineering and mechanical engineering programs take the course together, and the material is taught by a team of instructors from both academic departments. The Magnetic Levitation experiments are the primary means of teaching the classical analog control portion of the course. Other aspects of the course involve interfacing microcontrollers with sensors and actuators, and digital control. The magnetic levitation device fits easily on a two-person workbench and requires a power supply and oscilloscope. An infra-red emitter / detector pair is used to sense ball position for a feedback compensator. Students first learn classical control theory in a co-requisite course, “Dynamic Modeling and Control.” Modeling principles are introduced in the context of the magnetic levitation system as an unstable plant to be controlled. The system can be simulated by models ranging from simply linear to more complex to teach the trade-off between model fidelity and model development effort. The students derive the nonlinear governing equations and then linearize the equations and develop the transfer function of the plant. Students design a compensator and simulate the resulting stabilized system with Matlab and Simulink software. Students build their compensator on a solderless project board to levitate the steel ball. A proven lead-type compensator using two resistors and a capacitor is readily provided to students that struggle with their own compensator design so that all teams may enjoy the fruit of a successful experiment. As a laboratory aid, the magnetic levitation system allows for basic and advanced approaches to both theoretical study and practical investigation of a nonlinear, unstable system control. The comparison of measured results to predicted behavior leads to insight about how the physical system is modeled by mathematics. Students write a case study describing the system in detail including characterization of the sensors and actuators. Instructors report that the hands-on nature motivates students to excel. Surveyed students cite the hands-on activities as relevant applications that help develop deeper understanding and greater appreciation for the concepts learned in the classroom. The students are motivated to learn by the fascination of defying gravity.

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