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Journal articles on the topic 'Magnetická levitace'

Author: Grafiati

Published: 28 June 2021

Last updated: 1 February 2022

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1

Saroja, Gancang. "Magnetic Levitation for Diamagnetic Material Density Measurement: Theoretical Studies." Natural-B 3, no. 3 (April 1, 2014): 277–80. http://dx.doi.org/10.21776/ub.natural-b.2014.002.03.12.

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2

Dijkstra, Camelia E., Oliver J. Larkin, Paul Anthony, Michael R. Davey, Laurence Eaves, Catherine E. D. Rees, and Richard J. A. Hill. "Diamagnetic levitation enhances growth of liquid bacterial cultures by increasing oxygen availability." Journal of The Royal Society Interface 8, no. 56 (July 29, 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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3

Mishra, Rajat, Himashu Sharma, and Harshit Mishra. "High-speed vacuum air vehicle." Transportation Systems and Technology 4, no. 3 suppl. 1 (November 19, 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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4

Saroja, Gancang, Suyatman Suyatman, and Nugraha Nugraha. "Magnetic Levitation for Separation of Plastic Polyethylene Terephthalate (PET) and Polyvinyl Chloride (PVC)." Natural B 1, no. 4 (October 1, 2012): 337–42. http://dx.doi.org/10.21776/ub.natural-b.2012.001.04.6.

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5

Sutoko, Sutoko. "SISTEM KENDALI LEVITASI MAGNETIK REPULSIF MENGGUNAKAN METODE PROPORTIONAL-INTEGRAL-DERIVATIVE (PID)." Jurnal Teknologi Terapan: G-Tech 4, no. 2 (April 30, 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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6

Miyatake, Yoshihito, Mochimitsu Komori, Ken-ichi Asami, and 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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7

Nakashima, Hidetaka, Tatsuya Nakasaki, Tatsuhiro Tanaka, Yushi Kinoshita, Yuki Tanaka, Panart Khajornrungruang, Edmund Soji Otabe, and Keisuke Suzuki. "Study on Polishing Method Using Magnetic Levitation Tool in Superconductive-Assisted Machining." International Journal of Automation Technology 15, no. 2 (March 5, 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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8

Osa, Masahiro, Toru Masuzawa, Ryoga Orihara, and 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, no. 2 (April 15, 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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9

Kecik, Krzysztof, and Andrzej Mitura. "Theoretical and Experimental Investigations of a Pseudo-Magnetic Levitation System for Energy Harvesting." Sensors 20, no. 6 (March 14, 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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10

Etxaniz, Iñigo, Alberto Izpizua, Manex San Martin, and Joseba Arana. "Magnetic Levitated 2D Fast Drive." IEEJ Transactions on Industry Applications 126, no. 12 (2006): 1678–81. http://dx.doi.org/10.1541/ieejias.126.1678.

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11

Wang, Qun, Wei Ping Zhang, Wen Yuan Chen, Feng Cui, Shi Peng Li, Wu Liu, and Xiao Sheng Wu. "A Micro Diamagnetic Actuator for Micro Beads Levitation and Manipulation." Advanced Materials Research 143-144 (October 2010): 990–95. http://dx.doi.org/10.4028/www.scientific.net/amr.143-144.990.

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An efficient and convenient way to levitate and manipulate micro beads is reported, in which coils and soft magnetic materials are used to generate a magnetic field. The levitation is based on diamagnetic buoyancy, and the main structure of this device is made into spiral switch arrays so as to simplify the interconnection and magnetic field control. The design, modeling and fabrication of the device for manipulation of diamagnetic beads is given in detail. Theoretic analysis and experimental results of fabrication indicate the advantages and feasibility of the proposal illustrated here.

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12

Wolek, Arthur Lester. "Maglev freight - one possible path forward in the U.S.A." Transportation Systems and Technology 4, no. 3 (November 2, 2018): 117–33. http://dx.doi.org/10.17816/transsyst201843117-133.

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Background: As high-speed rail and other transportation technologies are moving forward and gaining funding in the United States, the push for MagLev is not receiving the necessary support that would make it a viable alternative in the near future. Major changes in the approach to implementing MagLev could make a better case for it, specifically for carrying freight. One alternative that has been considered in the past is the modification of existing freight railways to support MagLev. For this to be economically feasible and practical, such a solution has to be able to support both conventional freight trains and MagLev freight. Aim: The successful application of Partially Magnetically-Levitated Freight (PMLF) technology achieved by integrating superconducting MagLev technology with current railroad design and operations. Methods: A MagLev freight system that is envisioned to use existing rail routes must be designed to be compatible with the existing railway infrastructure. To accomplish this, every component utilized by the railroads must be examined in detail to determine if and how it could be affected by the proposed PMLF. In addition, components that will need to be modified for PMLF operation must undergo a retrofit design and testing process. The design scope must also include an examination of all existing tasks and activities that are being performed by the railroads such as track maintenance and repair. Any procedures that affect or are affected by the addition of PMLF will need to be modified. Finally, superconducting MagLev technology must be optimized and advanced for application to PMLF. Opinions and Discussions: The dual use of railway lines has substantial cost advantages when compared to building new dedicated MagLev freight corridors. In fact it could make the entire proposition very appealing if proven to be technically feasible. However, there are certain limitations and concerns that would cause policy makers to reject such a proposal unless such obstacles can be shown to be temporary and non-critical. Essential rail installations such as switches are presently difficult to modify in a way that would ensure reliable functionality for both MagLev and conventional freight trains, and grade crossings pose safety risks. It is difficult to envision the tremendous leap forward of merging MagLev with existing freight rail lines when much more basic technologies such as positive train control are not even fully implemented. Consequently, it is a challenge to advance MagLev in the United States where new dedicated freight corridors are considered to be cost-prohibitive and dual use railway lines pose uncertainties that railroad companies simply do not want to solve. However, there is one more solution has not been considered that would allow a MagLev freight train to navigate on existing railway infrastructure without disrupting traditional rail utilization. This solution is a partially magnetically-levitated freight train. Results: After reviewing the fundamental components, systems and operations of the railways in the United States, it will be feasible and practical to introduce magnetic levitation technology to assist in moving freight on existing rail routes. PMLF trains will be able to take advantage of magnetic levitation on sections where the track has been upgraded to allow its use and much higher speed while still being able to travel on unmodified sections with the same speed as traditional trains. Conclusion: Modifying existing freight rail with magnetic “quasi-lift” technology is a much lower cost alternative to building an entirely new MagLev infrastructure. This alternative will provide very important benefits including enhancing safety in the rail industry. In its first phase of implementation, the proposed PMLF system will levitate a significant portion of the weight of the train but still utilize the existing steel rails for traction and guidance. The most evident advantages of this approach include reduced wear on rail and other supporting elements, and a significant reduction in friction and energy use. Locomotives, freight cars and all other components could be made lighter and travel speeds will increase dramatically due to less impact and other effects. Later phases of implementation will focus on magnetic traction and guidance. The acceptance and success of this partially levitated system will eventually lead to fully levitated freight transport technology. Sometimes it is necessary to take smaller steps to achieve the desired future.

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13

Ahmed, Mohammed, Ejike Chibuzor Anene, Borskghinchin Daniel Halilu, and Hassan Buhari Mamman. "Steel Ball System Control Using T-S Type Fuzzy Logic." Applied Mechanics and Materials 773-774 (July 2015): 85–89. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.85.

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In this paper the Takagi-Sugeno type fuzzy logic was utilized for the purpose of control of electromagnetically levitated steel ball system. The system is the basis for important systems such as, the modern train which floats along the rails, aerospace shuttles, magnetic bearings and high precision systems. Such systems apart from being nonlinear they are also not stable. Results were obtained using the SIMULINK/MATLAB software and the control system developed for the electromagnetically levitated steel ball system was able to stabilize it with good response.

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14

Okada, Yohji. "Magnetic Bearings and Levitated Rotating Motor." Journal of the Society of Mechanical Engineers 96, no. 899 (1993): 880–83. http://dx.doi.org/10.1299/jsmemag.96.899_880.

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15

Smolyak, B. M., G. N. Perelshtein, and G. V. Ermakov. "Retarded magnetic relaxation in levitated superconductors." Technical Physics Letters 32, no. 2 (February 2006): 98–100. http://dx.doi.org/10.1134/s1063785006020027.

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16

MURAKAMI, Shin, and Takashi IKEDA. "Stabilization of a Magnetic Levitated Top." Proceedings of Conference of Chugoku-Shikoku Branch 2004.42 (2004): 195–96. http://dx.doi.org/10.1299/jsmecs.2004.42.195.

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17

Sun, Feng, Jun Jie Jin, and Koichi Oka. "Characteristics Analysis of Noncontact Spinning Mechanism with Numerical Simulation." Advanced Materials Research 308-310 (August 2011): 2146–51. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2146.

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This paper analyzes the spinning characteristics of a noncontact spinning mechanism with numerical simulation. In this mechanism, when the suspended object is stably levitated in the vertical direction by a magnetic suspension system, the disk magnets spin the suspended object in the horizontal direction by means of the remanent magnetization on the surface of the suspended object. The disk magnets are arranged around the levitated object, and the magnetic poles are arranged in a parallel configuration. In this paper, the mechanism is introduced, and the remanent magnetization on the surface of the suspended object is examined using a gauss meter. A numerical model is set up, and the spinning characteristics are analyzed with a step input and its velocity in steady states conditions using different numbers of magnets.

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18

Barry, N., and J. Hudgins. "Levitation of an Aluminium Disc in a Magnetic Flux Well." International Journal of Electrical Engineering & Education 44, no. 3 (July 2007): 280–88. http://dx.doi.org/10.7227/ijeee.44.3.7.

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An aluminium disc is levitated above a two-coil arrangement in a magnetic flux well, in a low voltage and wattage implementation. A coupled circuit analysis of the system allows an estimate of the lifting force.

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19

Zhu, S., Y. Cai, D. M. Rote, and S. S. Chen. "Magnetic Damping For Maglev." Shock and Vibration 5, no. 2 (1998): 119–28. http://dx.doi.org/10.1155/1998/480273.

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Magnetic damping is one of the important parameters that control the response and stability of maglev systems. An experimental study to measure magnetic damping directly is presented. A plate attached to a permanent magnet levitated on a rotating drum was tested to investigate the effect of various parameters, such as conductivity, gap, excitation frequency, and oscillation amplitude, on magnetic damping. The experimental technique is capable of measuring all of the magnetic damping coefficients, some of which cannot be measured indirectly.

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20

Ahmed, Raheel, Yu Li Jun, Muhammad Fawad Azhar, and Naveed Ur Rehman Junejo. "Comprehensive Study and Review on Maglev Train System." Applied Mechanics and Materials 615 (August 2014): 347–51. http://dx.doi.org/10.4028/www.scientific.net/amm.615.347.

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Electromagnetic levitated systems commonly used in the field of people transportation, tool machines frictionless bearings and conveyor systems. In the case of high speed people transport vehicles, the electromagnetic levitation offers the advantage of a very silent motion and of a reduced maintenance of the rail. Magnetic levitated trains requires the guidance force needed to keep the vehicles on the track is obtained with the levitation electromagnets, Particular shapes of the rails and to a clever placement of the electromagnets with respect to the rails helpful and effective to achieve the goal. This article gives the basic idea of the electromagnets trains and its control system mechanism

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21

WU, Huachun. "Thermal Characteristics of Magnetic Levitated Grinding Spindle." Journal of Mechanical Engineering 46, no. 20 (2010): 29. http://dx.doi.org/10.3901/jme.2010.20.029.

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22

SUZUKI, Masahiro, Kei ARIYOSHI, Yoichi KANEMITSU, Shinya KIJIMOTO, and Koichi MATSUDA. "807 Controller Design of Magnetic Levitated Isolator." Proceedings of Conference of Kyushu Branch 2001.54 (2001): 233–34. http://dx.doi.org/10.1299/jsmekyushu.2001.54.233.

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23

Kawaguchi, Toshiro, and Atsushi Yoshimura. "An ionization chamber with magnetic levitated electrodes." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 430, no. 2-3 (July 1999): 373–76. http://dx.doi.org/10.1016/s0168-9002(99)00231-4.

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24

Vijayakumar, K., D. Bubesh Kumar, and N. Shivakumar. "Analysis of Magnetic Levitated Savonius Wind Turbine." IOP Conference Series: Materials Science and Engineering 993 (December 31, 2020): 012039. http://dx.doi.org/10.1088/1757-899x/993/1/012039.

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25

Jiang, Wen, Yi Xin Su, and Dan Hong Zhang. "Research on Inverse Control of Active Magnetic Bearing Based on Fuzzy Inverse Model." Applied Mechanics and Materials 575 (June 2014): 744–48. http://dx.doi.org/10.4028/www.scientific.net/amm.575.744.

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For magnetic bearing system with characteristics of zero damping, negative stiffness and nonlinearity, this paper put forward a method of inverse control based on the fuzzy inverse model. The fuzzy system with fuzzifier and defuzzifier was used as an interpolator to approximate the inverse model of magnetic bearing. Then we connected the fuzzy inverse model in series with the magnetic bearing system to form a generalized pseudo linear plant, and selected a PID controller to control the pseudo linear plant. The fuzzy inverse model and the PID controller together formed an inverse controller to implement the closed-loop inverse control of the system. The simulation results demonstrate that the inverse control can reduce the overshoot, shorten the settling time, and make the rotor levitate in a larger range.

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26

SHENG, Z. Z., Y. H. LIU, X. FEI, L. SHENG, C. DONG, W. G. HARTER, A. M. HERMANN, D. C. VIER, S. SCHULTZ, and S. B. OSEROFF. "PREPARATION AND CHARACTERIZATION OF UNUSUAL LEVITATION Tl-Ba-Ca-Cu-O SAMPLES." Modern Physics Letters B 03, no. 03 (March 10, 1989): 249–55. http://dx.doi.org/10.1142/s0217984989000418.

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A preparation procedure for the Tl-Ba-Ca-Cu-O superconducting samples which can be levitated above or beneath a magnet is described. X-ray powder diffraction data for these samples are presented and discussed. Their electronic and magnetic properties are presented. The explanation for the unusual levitation is briefly discussed.

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27

Peng, Ruotong, Tong Zheng, Xing Lu, Xianze Xu, and Fengqiu Xu. "Simulation of a Synchronous Planar Magnetically Levitated Motion System Based on a Real-Time Analytical Force Model." Energies 13, no. 23 (December 2, 2020): 6367. http://dx.doi.org/10.3390/en13236367.

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The existing simulation method for the control of linear or planar magnetically levitated actuators always ignores the characteristics of the real physical object, which deteriorates the accuracy of the simulation. In this work, the proposed emulator for the magnetically levitated actuator is developed to consider both the force characteristics and the control algorithm. To model the real controlled object, the mathematical model for 1D (one-dimensional) and 2D (two-dimensional) magnetic arrays is derived where the yaw angle is taken into consideration using the coordinate transformation. The solution of the mathematical model is compared with the commercial BEM (boundary element method) software and the measurements from a force and torque testing setup to highlight the accuracy of the proposed mathematical model. Compared with the traditional simulation method of the motion control systems founded on the simplified system transfer function, the proposed simulation method has higher consistency and is closer to reality. The accuracy and efficiency of the proposed magnetic force model are further verified by the emulator based on the numerical force model and the testing data of the real setup.

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INOUE, Tsuyoshi, Yusuke INOUE, Fumihiko KOUSAKA, and Yukio ISHIDA. "144 Dynamic Analysis of Magnetic Levitated Conveyance System Considering the Electoro-magnetics field and Motion Coupling." Proceedings of the Dynamics & Design Conference 2003 (2003): _144–1_—_144–6_. http://dx.doi.org/10.1299/jsmedmc.2003._144-1_.

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29

Detoni, JG. "Progress on electrodynamic passive magnetic bearings for rotor levitation." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 10 (November 17, 2013): 1829–44. http://dx.doi.org/10.1177/0954406213511798.

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Electrodynamic suspension exploits repulsive forces due to eddy currents to produce positive stiffness by passive means, without violating the Earnshaw stability criterion. Systems employing this principle to levitate a rotor radial and/or axial degrees of freedom are called electrodynamic bearings (EDBs). Since the eddy currents can be induced either by using alternating current supplied electromagnets or by the relative motion between a conductor and a constant magnetic field, the research on EDBs has developed many different configurations. The present paper reviews the literature on electrodynamic passive magnetic bearings to analyze the evolution of this technology toward completely passive, stable, rotor levitation, and to compare the EDBs performance with other common magnetic bearing technologies. Radial and axial EDB technologies are reviewed attempting to create an organized connection between the works and to discuss some critical issues that still preclude the use of EDBs in industrial applications.

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30

MURAKAMI, Shin, Takashi IKEDA, and Masaya UETANI. "1205 Stability Analysis of a Magnetic Levitated Top : Discussion on Enlargement of Levitated Magnet Size." Proceedings of Conference of Chugoku-Shikoku Branch 2009.47 (2009): 389–90. http://dx.doi.org/10.1299/jsmecs.2009.47.389.

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31

Liu, Shou Fa, Zhang Jie Shi, and Chun Feng Li. "Design of Magnetic Levitated Thrust Bearing Experiment Table." Advanced Materials Research 199-200 (February 2011): 597–602. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.597.

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In this paper, the overall design of magnetic levitated thrust bearing experiment table was completed, of which the main experimental parameters those are electromagnetic parameters and structural dimensions were determined, in addition, the joint debugging and deformation measurement are performed. Analysis results showed that theoretical value, ANSYS simulation results and experimental results were similar, which said that it is feasible to perform stiffness check of the thrust collar on the experiment table.

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32

Wakui, Hajime. "Guideway Structures for Superconductive Magnetic Levitated Railway System." Concrete Journal 28, no. 12 (1990): 4–13. http://dx.doi.org/10.3151/coj1975.28.12_4.

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33

Yamachi, N., T. Nishikawa, M. Tomita, K. Sawa, and M. Murakami. "Measurements of magnetic fields of levitated bulk superconductors." Physica C: Superconductivity 378-381 (October 2002): 877–82. http://dx.doi.org/10.1016/s0921-4534(02)01818-x.

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34

Raab, Markus. "Magnetically Levitated Linear Drive with Repulsive Magnetic Guidance." International Journal of Mechanical Engineering and Applications 7, no. 1 (2019): 17. http://dx.doi.org/10.11648/j.ijmea.20190701.13.

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35

Wardhani, Rika Novita. "Program Aplikasi Kontrol Dan Pemodelan Matematika Levitasi Magnetik." MULTINETICS 1, no. 2 (May 6, 2015): 43. http://dx.doi.org/10.32722/multinetics.vol1.no.2.2015.pp.43-49.

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Wardhani, Rika Novita. "Program Aplikasi Kontrol Dan Pemodelan Matematika Levitasi Magnetik." MULTINETICS 1, no. 2 (May 6, 2015): 43. http://dx.doi.org/10.32722/vol1.no2.2015.pp43-49.

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37

Wardhani, Rika Novita. "Program Aplikasi Kontrol Dan Pemodelan Matematika Levitasi Magnetik." MULTINETICS 1, no. 2 (May 6, 2015): 43–49. http://dx.doi.org/10.32722/multinetics.v1i2.1181.

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Bratz, A., and I. Egry. "Surface oscillations of electromagnetically levitated viscous metal droplets." Journal of Fluid Mechanics 298 (September 10, 1995): 341–59. http://dx.doi.org/10.1017/s002211209500334x.

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We investigate the oscillation spectrum of electromagnetically levitated metal droplets. In the case of electromagnetic levitation, gravity is compensated by a Lorentz force, which is generated by an external current. The oscillation spectrum contains information about the thermophysical properties of the liquid metal, namely surface tension and viscosity. For a correct interpretation of these spectra the influence of the external forces on the frequencies and the damping of the surface waves must be well understood. The external forces deform the droplet, so that the static equilibrium shape is aspherical. For a perfect conductor the effect of the Lorentz force and gravity on the oscillation spectrum is calculated for an arbitrary magnetic field and arbitrary values of the viscosity. The high Reynolds number limit is evaluated. Explicit results are obtained for a linear magnetic field, which describes the experimental situation well.

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Domracheva, Yulia, and Sergey Loginov. "Simulation Technique of Synchronous Reluctance Bearingless Machine." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 2 (August 8, 2015): 101. http://dx.doi.org/10.17770/etr2013vol2.845.

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Magnetically levitated rotor electric machines can be used under such conditions wherein application of conventional bearings is impossible because of presence of lubrication. Active magnetic bearings application requires rotor length increase and stalling speed is decreased. Bearingless electric machines are the next step up of the magnetically levitated rotor machines. A bearingless electric machine module generates electromagnetic torque and radial forces. This feature makes possible to decrease the rotor length on retention of capacity of torque and forces. It is necessary to verify a control system operation algorithm via simulation model owing to complexity of machine electromagnetic interaction. It is practical to use a variable attribute set model for this purpose. The following article considers one of these models for researching the system via MATLAB Simulink. Basic relations for programmatic model creation are presented. Comparative assessment of various machine model types is made.

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Грачев, А. И. "Магнитный аналог вращения Квинке." Письма в журнал технической физики 47, no. 13 (2021): 21. http://dx.doi.org/10.21883/pjtf.2021.13.51116.18557.

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Opportunity to observe magnetic analog of the Quincke rotation effect, namely, spontaneous rotation of a spherical particle in homogeneous DC magnetic field (B), is analyzed. Two experimental versions: nonmagnetic particle suspensioned in ferromagnetic liquid and, second, - diamagnetic sphere levitated in vacuum, are considered. In the first case spontaneous rotation is possible in the fields B < 0.1 T for relaxation times of the particle magnetization ~ 10-3 s. Indispensible condition of accelerated spinning of the diamagnetic sphere is confinement of its rotation degree of freedom by only one rotation axis orthogonal to the vector B.

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Piłat, Adam. "Design and Analysis of Elliptic Rotor Suspended in Active Magnetic Bearing." Solid State Phenomena 147-149 (January 2009): 410–15. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.410.

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With this paper the suspension of an elliptic rotor is considered. The operating area, electromagnetic forces and the rotor shape are analyzed along with the static and dynamic properties of the levitated rotor to obtain the required performance. The linear and non-linear stabilizing controllers are suggested to obtain stable levitation. An interdisciplinary approach for modelling and simulation tasks is proposed.

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Cai, Y., and S. S. Chen. "Dynamic Characteristics of Magnetically-Levitated Vehicle Systems." Applied Mechanics Reviews 50, no. 11 (November 1, 1997): 647–70. http://dx.doi.org/10.1115/1.3101676.

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The dynamic response of magnetically-levitated (maglev) ground transportation systems has important consequences for safety and ride quality, guideway design, and system costs. This article, which reviews various aspects of the dynamic characteristics, experiments and analysis, and design guidelines for maglev systems, discusses electrodynamic system (EDS) maglev vehicle stability, motion-dependent magnetic force components, guideway characteristics, vehicle/guideway interaction, ride quality, suspension control laws, aerodynamic loads and other excitations, and research needs. This review article includes 157 references.

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

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

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Андреев, Е. Н., Д. Н. Арсланова, Е. В. Ахметзянова, А. М. Базаров, В. Н. Васильев, О. С. Васильева, М. С. Верхотуров, et al. "Комбинированные электромагнитные подвесы с пониженным энергопотреблением для левитационного транспорта." Журнал технической физики 89, no. 7 (2019): 1123. http://dx.doi.org/10.21883/jtf.2019.07.47811.419-18.

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The magnetic levitation technology is principally categorized as electromagnetic suspension and electrodynamic suspension, both now practically implemented in maglev trains in China, Korea, Japan and other countries. The magnetic field to levitate a vehicle can be provided by either normal conducting electromagnets, or superconducting magnets, or high-coercivity permanent magnets. With the technology advancing in superconductors and magnetic materials, hybrid configurations that employ different types of magnets become promising for commercial application. Magnets synergy results in better performance and lower energy consumption as justified by virtual prototyping and measurements on sub-scale models. Stable levitation of a loaded platform has been demonstrated on a test bench. A series of parametric simulations (performed with the use of software developed in RF) and magnetic measurements enabled validation of computational and physical models of all magnets and adjustment of numerical procedures for scaling parameters with respect to the practical load capacity and other operational characteristics. The established approach will be used for full-scale modelling of realistic maglev vehicles, particularly, a 50-ton flat freight car.

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Zhang, Chi, and Guang Zhou Zhao. "Design and FEM Analysis of a High Efficiency Axial-Flux Brushless DC Motor for Flywheel System." Key Engineering Materials 480-481 (June 2011): 1099–104. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.1099.

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A high efficiency axial-flux brushless DC motor assisted by self axial magnetic bearing and used in flywheel energy storage system is proposed in this paper. In this design, the rotor with composite rim acts as the flywheel of the system and is sandwiched between two disk type stators which are made of amorphous metal to reduce iron losses. The dual-stator machine combines the functions of axial flux brushless DC motor and axial magnetic bearing to rotate the flywheel-rotor and levitate it in vertical orientation. The other four degrees of freedom in radial directions are constrained by ceramic ball bearings for simple operation, high efficiency and long life span. Optimized design approaches are employed to achieve low losses, and high power density. Three-dimensional FEM analyses are implemented, and the analysis results support the feasibility of the proposed motor.

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Xu, Xianze, Chenglin Zheng, and Fengqiu Xu. "A Real-Time Numerical Decoupling Method for Multi-DoF Magnetic Levitation Rotary Table." Applied Sciences 9, no. 16 (August 9, 2019): 3263. http://dx.doi.org/10.3390/app9163263.

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Magnetic levitation technology shows promise for realizing multiple degrees of free precision motion for modern manufacturing, as the bearing and guiding parts are not used. However, motion decoupling in a magnetically levitated (maglev) system is difficult because it is hard to derive accurate magnetic force and a torque model considering the translation and rotation in all axes. In this work, a magnetic levitation rotary table that has the potential to realize unlimited rotation around the vertical axis and a relatively long stroke in the horizontal plane is proposed and analyzed, and the corresponding real-time numerical decoupling method is presented. The numerical magnetic force and torque model solves the current to magnetic force and torque transformation matrix, and the matrix is used to allocate the exact current in each coil phase to produce the required motion in the magnetically levitated (maglev) system. Next, utilizing a high-level synthesis tool and hardware description language, the proposed motion-decoupling module is implemented on a field programmable gate array (FPGA). To realize real-time computation, a pipelined program architecture and finite-state machine with a strict timing sequence are employed for maximum data throughput. In the last decoupling module of the maglev system, the delay for each sampling point is less than 200 μ s. To illustrate and evaluate real-time solutions, they are presented via the DAC adapter on the oscilloscope and stored in the SD card. The error ratios of the force and torque results solved by the numerical wrench model were less than 5 % and 10 % using the solutions from the boundary element method (BEM) program package RadiaTM as a benchmark.

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Kurita, Nobuyuki, Takeo Ishikawa, and Genri Suzuki. "Development of the Two Pole Type Shaded Pole Self-Bearing Motor." Materials Science Forum 856 (May 2016): 196–201. http://dx.doi.org/10.4028/www.scientific.net/msf.856.196.

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In order to reduce the size and complexity of the driving circuit of the self-bearing motor, this paper proposes a magnetically levitated shaded pole induction motor. The rotor is still supported by magnetic force, but the motor has a very simple structure because magnetic levitation and rotation can be achieved with only one amplifier. The suspension force and rotational torque have been analyzed by FEM magnetic field analysis. A simple experimental setup using the rotor of a commercial shaded pole induction motor was designed and fabricated. Although it did not succeed in levitation control, the rotation control was successful in the situation where perpendicular and horizontal movement of the rotor were restricted.

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Zhang, Xinhua, Qing Zhu, Yukun Sun, Zebin Yang, and Xiaodong Sun. "Three-degree-of-freedom positioning control of magnetically levitated permanent magnet planar motor using active disturbance rejection control scheme." Advances in Mechanical Engineering 9, no. 7 (July 2017): 168781401770008. http://dx.doi.org/10.1177/1687814017700088.

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Magnetically levitated permanent magnet planar motor is a new-generation motion device in modern precision industry, and the design of advanced motion controller has always been a main concern in the research and development of magnetically levitated permanent magnet planar motor. Due to the decrease in electromagnetic force caused by the deflection of the mover or the sharp decrease in magnetic flux density with height, it is very difficult to realize accurate positioning control of 3 degrees of freedom. In this article, an active disturbance rejection control scheme is adopted. The extended state observer is used to estimate the comprehensive disturbance and motion state in real time. Then, according to the value estimated by the extended state observer, the active disturbance rejection control motion controller can compensate the electromagnetic force in time to achieve good anti-jamming performance. Simulation and experimental results demonstrate that the adopted active disturbance rejection control scheme has good dynamic performance and uncertain disturbance robustness.

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CANSIZ, AHMET, and UGUR CEM HASAR. "ANALYTICAL AND NUMERICAL ANALYSIS OF FORCE AND STIFFNESS IN A DIAMAGNETIC BEARING." Modern Physics Letters B 23, no. 23 (September 10, 2009): 2763–70. http://dx.doi.org/10.1142/s0217984909020850.

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In this letter, a bearing consisting of a disk-shaped NdFeB permanent magnet levitated by a ferrite magnet with a diamagnetic stabilizer made of two bismuth blocks has been statically analyzed. The analysis, including levitation force and stiffness characteristics of this diamagnetic bearing, has been incorporated with the diamagnetic mirror image method based on the finite element and dipole approximation methods. Force equations of the levitated magnet are derived from the potential of the system in terms of magnetic, diamagnetic and gravitational interactions. The dipole approximation and finite element method were compared with each other. It is observed that while the dipole approximation (an analytical method) is successful in predicting the force and stiffness of the bearing, the finite element method, on the other hand, only estimates the levitation force. It is shown that the dipole approach has advantages over the finite element method for various perspectives such as calculation time and precision.

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Ismael, Omar Y., Mohammed Qasim, and Mohanad N. Noaman. "Equilibrium Optimizer-Based Robust Sliding Mode Control of Magnetic Levitation System." Journal Européen des Systèmes Automatisés 54, no. 1 (February 28, 2021): 131–38. http://dx.doi.org/10.18280/jesa.540115.

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Magnetic Levitation System (MLS) objective is to levitate objects to the desired height without any contact. MLS is highly nonlinear and inherently unstable. Such a system imposes a challenge when designing robust and high-performance controllers. This paper presents the design of a Sliding Mode (SM) controller with an Integral term called SM-I controller to achieve the desired levitation against nonlinearities and uncertainties of the system. The controller parameters are tuned using the Equilibrium Optimizer (EO) algorithm. The Effectiveness of the proposed controller is validated by simulation results. Simulations are performed for servo tracking with and without perturbations in the MLS parameters. The proposed controller is compared with the conventional SM, LQR, and PID controllers to show its superiority. The results prove that the SM-I is more efficient than the other controllers.

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