By Topic

IEEE Translation Journal on Magnetics in Japan

Issue 6 • Date June 1987

Filter Results

Displaying Results 1 - 25 of 35
  • [Front cover]

    Publication Year: 1987, Page(s): c1
    Request permission for commercial reuse | PDF file iconPDF (1320 KB)
    Freely Available from IEEE
  • List of contributors

    Publication Year: 1987, Page(s): nil1
    Request permission for commercial reuse | PDF file iconPDF (210 KB)
    Freely Available from IEEE
  • [Breaker page]

    Publication Year: 1987, Page(s): nil1
    Request permission for commercial reuse | PDF file iconPDF (209 KB)
    Freely Available from IEEE
  • Table of contents

    Publication Year: 1987, Page(s):481 - 482
    Request permission for commercial reuse | PDF file iconPDF (202 KB)
    Freely Available from IEEE
  • Theoretical Analysis of Magnetic Recording Media Noise

    Publication Year: 1987, Page(s):483 - 489
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (853 KB)

    The noise properties of magnetic recording media partly depend on the type of medium, i.e., whether the medium is of the magnetic thin film type or the particulate type. In magnetic thin film media, such as Co-Ni-P plated disks, the lowest noise level is that of dc-erased noise, and when signals are recorded after dc-erasure the level of the modulation noise increases gradually as the recording wa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Simulation of Spacing between Magnetic Head and Medium of Video Floppy

    Publication Year: 1987, Page(s):490 - 496
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1248 KB)

    A simulation of the spacing between a magnetic head and medium has been performed to investigate the spacing characteristics of head shapes used with video floppy disks. In this simulation, the finite element method was used to solve Reynold's equation and the equation of motion for the transformation of the medium. Both equations were discretized simultaneously. The analysis yielded the following... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Charged Wall Behavior Observed by Bubble Run-Out Method

    Publication Year: 1987, Page(s):497 - 504
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2683 KB)

    A new potential well measurement method, utilizing bubble run-out phenomena, is discussed, with emphasis on its application in observing charged wall behavior, as well as in measuring the potential well depth itself. The method is applied to bubbles in ion implanted propagation patterns on 1 ¿m bubble garnet films with different magnetostriction constants. Bubble run-out directions are found to b... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dynamics of Stripe Domain Walls in Bubble Films

    Publication Year: 1987, Page(s):505 - 511
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    Computer simulations of the dynamic behavior of domain walls in bubble films, for use in the development of the different functions of Bloch line memories, are commonly based on the domain wall model developed by Slonczewski. To investigate the degree of reliability of this wall model, we compared numerical results of the dynamics of an infinitely long, straight stripe domain with stripe translati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Operation of High-Frequency Half-Wave Rectifier Circuit Which Contains Saturable Core

    Publication Year: 1987, Page(s):512 - 513
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (203 KB)

    Design and operation of an amorphous spike-reduction saturable core used in a half wave rectifier circuit was studied in the high-frequency waveband of a 100 kHz operating frequency. It was found that the reverse current flowing through the circuit is controlled by the core exciting current, and that the core absorbs the spike and is reset. Reset flux was also found resulting in extremely low redu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Loss Reduction of a Multi-Input Transformer in a Flyback Converter

    Publication Year: 1987, Page(s):514 - 515
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (785 KB)

    Making power supplies more compact by reducing transformer distributed capacitance which will in turn reduce loss is discussed. This is especially important for the multi-input transformers in flyback converters. It was found that the so-called sandwich winding, with a low-voltage winding and a secondary winding inserted between high-voltage windings, is effective for this purpose. Transformer los... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transient Response in a Converter Controlled by a Magnetic Amplifier

    Publication Year: 1987, Page(s):516 - 518
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (271 KB)

    The relationship between the magnetic characteristics of a saturable reactor core and its transient response in converters controlled by magnetic amplifiers is presented. The linear operating region in the converters depends on the permeability ¿s in the saturation region of the saturable reactor core. It was found that excellent transient response can be obtained by using a low ¿... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High Frequency Transistor Inverter with CT

    Publication Year: 1987, Page(s):519 - 521
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The commutation mechanism of high-frequency transistor inverters with a current transformer was studied. The current transformer eliminated the need for dead time in the commutation time, as in the usual procedure. It was also found that storage time can be reduced by connecting an external base resistance and that the storage time can be used for effective switching. However there is a trade off ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Experimental Considerations on Photovoltaic Power System Using Orthogonal-Core-Type DC-AC Converter

    Publication Year: 1987, Page(s):522 - 524
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (247 KB)

    Operation characteristics of a photovoltaic power system using an orthogonal-core type dc-ac converter linking a solar array and pre-existing ac system were studied. The link was established at about 20 percent sunlight, and as the sunlight increases, the power supplied from the solar array to the ac system increases as anticipated. Favorable operating characteristics were found even when sunlight... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characteristics of DC-AC Interconnection System Using an Orthogonal-Core and an SIT Inverter

    Publication Year: 1987, Page(s):525 - 526
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (219 KB)

    The power characteristics of a dc-ac interconnection system using an orthogonal core and a static induction transistor (SIT) inverter were studied. It was found that the power supplied to the ac line can be controlled from zero to its maximum value, by varying the phase angle in the range 90° to 130°, and that the efficiency of the SIT square wave inverter reaches values in the range 90 percent ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Numerical Method for Estimation of Core Characteristics

    Publication Year: 1987, Page(s):527 - 529
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    A method for estimating the characteristics of magnetic cores with gaps in the magnetic circuits was studied to aid in the design of electrical equipment based on such cores. The eddy current effect in a core was considered from the point of view of classical theory, while the tableau equation was obtained by applying the tableau method to the circuit. Expected values for the measurable circuit va... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of Residual Magnetization and Consideration on Demagnetizing Condition of Mild Steel

    Publication Year: 1987, Page(s):530 - 532
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (226 KB)

    The residual magnetic flux distribution in mild steel subjected to magnetization and demagnetization by electromagnets was analyzed from the hysteresis loops, determined using the finite-element method, to find the optimum demagnetizing conditions. It was found that as demagnetizing time increases the demagnetizing effect improves and that when the mild steel was demagnetized under an attenuating ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Analysis of Extraordinary Oscillation of Potential Transformers

    Publication Year: 1987, Page(s):533 - 534
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    A simulation model of extraordinary oscillation in potential transformers (PT) was studied to determine conditions for its occurrence and countermeasures. The extraordinary oscillation is analyzed by solving the simultaneous equations derived from the circuit state equation by the harmonic balance method. Addition of a damping circuit on the PT side, or of a ground compensating capacitance on the ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of Stochastic FEM in the Analysis of Magnetic Fields

    Publication Year: 1987, Page(s):535 - 536
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (238 KB)

    The stochastic finite element method designed to deal with indeterminate elements in actual magnetic materials was studied. Permeability is considered as a variable in a homogeneous two-dimensional spatial stochastic process, and the analysis results are compared with those of the usual determinate finite-element method. Both methods produced identical results over a wide range. But the advantage ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transverse Fluxes and Magnetic Characteristics of Three-Phase Transformer Core with Ducts

    Publication Year: 1987, Page(s):537 - 538
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (251 KB)

    The influence of the perpendicular ducts in a three-phase transformer core on the magnetic characteristics is studied by using the finite element method. The relationship between the duct width and the flux distribution are examined in detail. It is clarified that the transverse flux at the duct cannot be ignored. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characteristics of an Improved Parametric Linear Motor

    Publication Year: 1987, Page(s):539 - 540
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (199 KB)

    An improved element was experimentally produced for a parametric linear motor with the magnetic poles positioned on a straight line to overcome the situation in which the shifting magnetic field flux distribution is not homogeneous and good results were obtained. It was found that the flux distribution in the improved element was smoother than in the conventional element for a parametric linear mo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Output Characteristics of a Four-Pole Parametric Induction Motor Affected by the Size of Common Magnetic Circuits

    Publication Year: 1987, Page(s):541 - 542
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (238 KB)

    The relation between the width of the common magnetic circuits in a four-pole parametric induction motor and the motor's characteristics was studied. It was found that the smaller the width of the common magnetic circuits the better the motor characteristics are. This seems to be due to the fact that the oscillation stability increases and the effective flux to the rotor increases as the common ma... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Considerations on the Optimum Design of Small-Sized Parametric Induction Motors

    Publication Year: 1987, Page(s):543 - 545
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (266 KB)

    Optimization of the magnetic properties of small output parametric motor materials was studied. Six motors with various combinations of permalloy, ferrites, and silicon steel of the same physical dimensions were fabricated. The authors conclude that isotropic materials, such as ferrite, which easily reaches magnetic saturation, are favorable for the common magnetic circuits, while materials with h... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Coal Powder Beneficiation by Dry Hgms Process--American Coal

    Publication Year: 1987, Page(s):546 - 548
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (306 KB)

    A method for the beneficiation of American coal powder without using a liquid dispersion medium was investigated. In this method the coal powder is fluidized in a high gradient magnetic field region. Processing American coal by this technique resulted in a performance level yield of 80 percent and ash reduction rate of 30 percent, which were rather good results. Also, no reduction in separation ef... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • HGMS Filter Performance for Recovery of Magnetic Flocs

    Publication Year: 1987, Page(s):549 - 550
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (198 KB)

    The magnetic seed method was used in this study to evaluate the performance of a high-gradient magnetic (HGMS) filter and to investigate the effects of coagulant and pH on the accumulation of magnetic flocs in the filter. It was found that as the concentration of coagulant increased, the initial recovery increased. At a pH of 5.0, the magnetite and silicon dioxide were sufficiently combined that t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characteristic Test of Static Power Transmission on the Face-Type Permanent Magnet Torque Coupling

    Publication Year: 1987, Page(s):551 - 552
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (235 KB)

    A characteristic test of the face-type magnetic coupling static power transmission system was performed to obtain basic data on a permanent magnet torque coupling. It was found that facing poles and adjacent poles have to be unlike for maximum transmission torque. It was easy to determine the relation between the phase angle after pull-out and the transmission torque in this static test, something... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

IEEE Translation Journal on Magnetics in Japan is a publication of the IEEE Magnetics Society published between 1985 and 1994.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
James E. Opfer
Hewlett-Packard