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IEEE Transactions on Magnetics

Issue 3 • September 1974

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Displaying Results 1 - 25 of 156
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • 1974 INTERMAG Conference committees

    Publication Year: 1974, Page(s):394 - 395
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    Freely Available from IEEE
  • Highlights of the 1974 INTERMAG

    Publication Year: 1974, Page(s): 396
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  • Electromagnetic flight

    Publication Year: 1974, Page(s): 397
    Cited by:  Papers (14)
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  • The Wolfson Maglev project

    Publication Year: 1974, Page(s):398 - 401
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The philosophy behind the Wolfson Maglev Project at Warwick University is stated, and details of major elements of hardware are given. Levitation and propulsion techniques, cryostat and chassis designs that will be incorporated in the final passenger carrying vehicles are discussed. View full abstract»

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  • Design of a full-scale magneplane vehicle

    Publication Year: 1974, Page(s):402 - 405
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The design of a full-scale 140-passenger Magneplane vehicle is described, emphasizing its cryogenic aspects. The vehicle has an overall length of 50m and maximum width of 3.8m. Its gross weight is just under 45,000 kg. The cross-sectional profile and structure of the fuselage are modeled after modern commercial Jet aircraft such as the Boeing 707. Sixteen elliptic superconducting pancake coils are... View full abstract»

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  • Magneplane power supply costs

    Publication Year: 1974, Page(s):406 - 409
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Means are studied to bring propulsion power from commercial utility lines and distribute it and control it to the LSM propulsion winding in the guideway. Switched sections of propulsion winding from 0.25 km to 2.5 km long are considered and cost variations explored. Magneplane guideway for this study propagates a fixed frequency travelling magnetic wave on which vehicles with superconducting magne... View full abstract»

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  • Limitations of levitation by iron-cored electromagnets

    Publication Year: 1974, Page(s):410 - 412
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    We present simple "best-case" calculations of power/lift and lift/weight ratios for iron-cored electromagnetic levitation systems using either the attraction between controlled electromagnets and ferromagnetic guideway members or the repulsion between a.c. electromagnets and guideway conductors. Although power/lift ratios are low, the practical engineering restrictions of conductor current density... View full abstract»

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  • Guidance of a high speed vehicle with electrodynamic suspension

    Publication Year: 1974, Page(s):413 - 416
    Cited by:  Papers (8)
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    Guidance requirements for a high speed Maglev vehicle with electrodynamic suspension and linear synchronous motor propulsion are discussed. The effects of cornering, cross-winds and lateral destabilizing forces on the suspension are shown to lead to a guidance stiffness requirement of 104N/cm for small lateral displacements. This guidance force can be produced with a flat elevated guide... View full abstract»

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  • The German magnetic transportation program

    Publication Year: 1974, Page(s):417 - 420
    Cited by:  Papers (4)
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    The development of the German magnetic-transportation program is reviewed. First the chronological process of the program is outlined. Next follow descriptions of system and component developments. Finally several experimental facilities are described. View full abstract»

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  • Survey of basic magnetic levitation research in Erlangen

    Publication Year: 1974, Page(s):421 - 424
    Cited by:  Papers (3)
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    A short survey of the basic research - theoretical and experimental - that is being done at the Research Laboratories of Siemens AG in Erlangen on various basic and hybrid levitation systems is given. Along with the digest of the so far published work, some new results on difference flux system, hybrid normal-null flux system with a T-shaped track and a simple hybrid ferromagnetic null flux system... View full abstract»

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  • Lift and drag forces for the attractive electromagnetic suspension systems

    Publication Year: 1974, Page(s):425 - 428
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Experiments on small-scale magnets have been performed to determine the effects of track eddy currents on the behavior of the attractive electromagnetic suspension system. Measurements of the velocity dependence of the current and the drag force for fixed lift force have been made for velocities up to 100 m/s. A model of the magnet based upon the magnetization of the poles has been developed. Four... View full abstract»

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  • Edge effects in induction problems

    Publication Year: 1974, Page(s):429 - 430
    Cited by:  Papers (6)
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    The conditions under which unbounded fields can exist at the edges of a ponderable body are examined. Following Meixner's approach, it is shown that for a nonpermeable finite-conductivity body, such singularities do not exist. View full abstract»

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  • LSM control of Maglev vehicle ride quality

    Publication Year: 1974, Page(s):431 - 434
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The ride quality of a high speed repulsion type magnetically levitated vehicle using linear synchronous motor (LSM) propulsion has been studied. Vehicle motion is dependent upon the active LSM forces, the passive magnetic lift and drag forces, the aerodynamic drag force, and the technique employed for control. Derivations of the passive lift and drag forces and of the active heave and propulsion c... View full abstract»

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  • A linear synchronous motor for high-speed ground transport

    Publication Year: 1974, Page(s):435 - 438
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    This paper describes a linear synchronous motor which has been designed to propel a 500 km/hr electrodynamically-levitated vehicle. Superconducting magnets on the vehicle interact with an aluminum-cable winding built into the guideway. Following a description of the motor, a coupled-circuit model is derived and used to optimize the winding Configuration and to predict the performance of the motor.... View full abstract»

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  • Laboratory studies of magnetic levitation in the thin track limit

    Publication Year: 1974, Page(s):439 - 442
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Thermographic techniques and rotating wheel experiments are used to examine magnetic forces and dynamics of levitated models. Induced track current and magnetic pressure distributions for moving superconducting levitation coils are infered from laboratory tests on coils with sinusoidal currents. Magnetic search coils and liquid crystal and infrared thermography are used to determine current patter... View full abstract»

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  • Force calculations for hybrid (ferro-nullflux) low-drag systems

    Publication Year: 1974, Page(s):443 - 446
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    A strong lift large clearance suspension can be produced using the attraction between superconducting train magnets and iron track sheets. A null flux arrangement of track loops interacting with the same train magnets will yield magnetic lift/drag ratios of several hundred, and can be designed to give whatever degree of inherent stability is desired. As an example, lift forces of two tons per foot... View full abstract»

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  • Analysis of forces in rectangular-pole geometries using numerical integration techniques

    Publication Year: 1974, Page(s):447 - 450
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The force and stiffness characteristics for rectangular-pole geometries are derived as a function of the parameters gap width, pole width and pole displacement. The Schwarz-Christoffel transformation technique is employed, with the simpler cases giving directly integrable solutions, or solutions in terms of elliptic integrals. For the most general case, numerical integration is used to determine t... View full abstract»

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  • Dynamic performance of the SRI Maglev vehicle

    Publication Year: 1974, Page(s):451 - 457
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    The stability and ride quality of a small scale MAGLEV test vehicle were determined by measuring its motions in five degrees of freedom during levitated flight. Various offsets were introduced into the guideway to stimulate strongly different modes of oscillation and to search for instabilities. These offsets, that were up to 25% of the equilibrium suspension height, induced motions that were anal... View full abstract»

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  • Magnetic damping force in electrodynamically suspended trains

    Publication Year: 1974, Page(s):458 - 461
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    A magnetic levitation system utilizing superconducting magnets is now being developed for a high speed ground vehicle. From a view point of ride quality, a damping force for the mechanical oscillation of a levitated vehicle is one of the most important problems in this levitation system. This paper presents the analysis of the magnetic damping force in a loop track magnetic levitaion system; the m... View full abstract»

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  • The calculation of eddy losses in guideway conductors and structural members of high-speed vehicles

    Publication Year: 1974, Page(s):462 - 465
    Cited by:  Papers (7)
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    Magnetic fields produced by superconducting magnets on high speed guided vehicles may produce intolerably large eddy losses in armature and stabilization windings as well as in structural Steel components unless proper precautions are taken. This paper describes an approximate method of calculating the eddy losses and illustrates the method by calculating the losses for a proposed linear synchrono... View full abstract»

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  • Observations on permanent magnets related to damping effects in levitation devices

    Publication Year: 1974, Page(s):466 - 469
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    Microscopic observations applying high, variable magnetic fields on surfaces of high-coercivity magnets reveal hysteretic magnetization changes by domain wall movements. Lines, formerly believed to be grain boundaries, are moving with changing magnetic fields during the magnetization reversal. Domain wall motions are shown on single micrographs which were selected from sequences of micrographs dep... View full abstract»

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  • Experiments on the lateral stabilisation and levitation of linear induction motors

    Publication Year: 1974, Page(s):470 - 473
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Conventional linear motors always have a component of force which acts at right-angles to the normal (levitation) and longitudinal (traction) forces, and which attempts to expel the secondary side-ways from under the primary. This paper describes some different types of machine in which these lateral forces always act inwards, i.e. attempt to align the primary with the secondary. The first machine... View full abstract»

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  • Magnetic bubble garnet films from BaO-BaF2-B2O3solvent

    Publication Year: 1974, Page(s):477 - 479
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (225 KB)

    The ternary solvent system, BaO-BaF2- B2O3has been examined to produce several magnetic bubble garnet films by liquid phase epitaxy. Contrary to the conventional PbO-B2O3solvents, the BaO-BaF2-B2O3Solvents are characterized by negligible volatility and slight toxicity. High quality bubble films of gallium- or a... View full abstract»

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  • The preparation of large area films for bubble domain devices

    Publication Year: 1974, Page(s):474 - 476
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The growth of LPE films 3.8 cm in diameter has been achieved under conditions which lead to a high yield of defect free material suitable for bubble domain circuits. Temperature control to ±0.1°C, larger melt volumes, more precise timing of runs and an increase in saturation temperature of the melt to 970°C all contribute to the improved quality. The change to 970°C also sharpl... View full abstract»

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Aims & Scope

IEEE Transactions on Magnetics publishes research in science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage.

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Meet Our Editors

Editor-in-Chief
Pavel Kabos
National Institute of Standards and Technology