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IEEE Translation Journal on Magnetics in Japan

Issue 6 • Date Nov.-Dec. 1994

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Displaying Results 1 - 25 of 63
  • [Front cover]

    Publication Year: 1994, Page(s): c1
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  • List of contributors

    Publication Year: 1994, Page(s): nil1
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  • [Breaker page]

    Publication Year: 1994, Page(s): nil1
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  • Table of contents

    Publication Year: 1994, Page(s):1 - 4
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  • Opinion

    Publication Year: 1994, Page(s): 5
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  • Opinion

    Publication Year: 1994, Page(s): 6
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  • Magneto-Impedance Element Using Amorphous Micro Wire

    Publication Year: 1994, Page(s):7 - 14
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (991 KB)

    A large magneto-impedance (MI) effect was found in amorphous magnetic wires while passing a high-frequency current. The amplitude of the induced voltage between the ends of a wire changes by 40 to 50% when an external magnetic field of about 10 Oe (approximately 800 A/m) is applied parallel to the wire axis. This paper reports the principles and basic properties of the MI effect in very small amor... View full abstract»

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  • Distance Sensors Using Domain Wall Propagation Driven by a Wire Current Pulse Train in Amorphous Magnetostrictive Wires

    Publication Year: 1994, Page(s):15 - 20
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (711 KB)

    A new distance sensor described in this paper uses stepwise propagation of a domain wall by a pulse wire current train in a twisted magnetostrictive amorphous wire. A distance sensor of simple construction and with a length of 1000 mm was obtained. The sensor characteristics are controlled by applying torsion, and a suitable amount of torsion, with minimal nonlinearity, was identified. To improve ... View full abstract»

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  • Examination of the Shape Variation and Stress Distribution of Vibration Elements Using Giant Magnetostrictive Material

    Publication Year: 1994, Page(s):21 - 26
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1333 KB)

    Acoustic vibration elements using giant magnetostrictive material (AVEG) are employed as vibration sources for under-sea acoustic propagation over distances of 1000 km or more. In this paper the magnetic circuit of the driving unit was analyzed using the finite element method. The flux density distribution is nonuniform in the magnetostrictive vibrator. Converting flux density B into magnetostrict... View full abstract»

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  • Fabrication of Thin-Film Actuators Using Magnetostriction

    Publication Year: 1994, Page(s):27 - 32
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (733 KB)

    We fabricated two kinds of cantilever actuator and a traveling machine by using magnetostrictive Tb-Fe and Sm-Fe thin films on a polyimide substrate. No power supply cable is required for their actuation, because they are driven by an external magnetic field. The magnetostrictive cantilevers exhibited a large deflection in low magnetic fields. Their unique characteristics suggest that magnetostric... View full abstract»

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  • Fundamental Characteristics of a Large-Scale Cylindrical Magnetic Shield with Shaking

    Publication Year: 1994, Page(s):33 - 38
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    A large-scale cylindrical magnetic shielding case was developed. It was made of permalloy (outer diameter 68 cm, length 180 cm, thickness 1.6 mm, weight approximately 60 kg) with an opening at one end and with Metglas® 2705M amorphous ribbons (width 5 cm, thickness approximately 22 ¿m) wound spirally about the permalloy case in 16 layers (total weight 12.1 kg) to cover the surface. A toroidal co... View full abstract»

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  • Permeability and α-Fe Phase Precipitated in Fe-Si-B-Cu-Nb Amorphous Alloys

    Publication Year: 1994, Page(s):39 - 46
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1059 KB)

    The soft magnetic properties of amorphous Fe-Si-B-Cu-Nb alloys are markedly improved by annealing the alloys above the crystallization temperature. The magnetic permeability of the annealed Fe74SixB22-xCu1Nb3 alloys shows a maximum value at an Si concentration of x=14. The precipitation of μ-Fe grains is observed for the annealing temp... View full abstract»

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  • Magnetic Properties of Extruded Nanocrystalline Fe-Nb-B Alloys

    Publication Year: 1994, Page(s):47 - 54
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2389 KB)

    A bulk Fe84Nb7B9 alloy was produced by extruding amorphous powder at temperatures (Te) between 653 and 723K, at pressures (Pe) between 824 and 1208 MPa, and at a speed (Ve) of 5 mm/s. The subsequent annealing of the extruded bulk alloy for 3.6 ks at temperatures between 873 and 973K resulted in the formation of a (for the most part)... View full abstract»

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  • Magnetostriction of Fe-Co Alloy Films and Its Control by Multilayering

    Publication Year: 1994, Page(s):55 - 60
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1322 KB)

    The bec Fe70Co30 alloy has a high saturation magnetization and a large positive magnetostriction, whereas the fcc Ni75Co25 alloy has a large negative magnetostriction value. This paper reports the results of a systematic investigation into the magnetic properties of FeCo/NiCo multilayer films. Magnetostriction in an FeCo/NiCo film becomes smaller as the ... View full abstract»

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  • Phase Modulation Device Using Amorphous Short Wire

    Publication Year: 1994, Page(s):61 - 65
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1213 KB)

    A new phase-modulation device with simple structure and high reliability was constructed using a short amorphous wire. A high-frequency ac current (carrier) and a signal current are simultaneously passed through the wire, which undergoes the large Barkhausen effect when the circumferential flux changes. Highly linear modulation characteristics were obtained up to 0.67¿ using a triangular-wave ac ... View full abstract»

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  • A Technique for Measuring Thin-Film Inductors Driven at High Flux Densities

    Publication Year: 1994, Page(s):66 - 71
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (782 KB)

    This paper discusses the basic properties of thin-film inductors driven at high flux densities. We made inner-coil-type thin-film inductors, each with either a closed or an open magnetic circuit, and developed a technique for measuring the impedance of the inductors at high flux densities. We used this technique to reduce the multiple voltage reflections between amplifier and inductor. The impedan... View full abstract»

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  • Analysis of Magnetic Shielding Effects for Thin-Film Inductors

    Publication Year: 1994, Page(s):72 - 77
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1385 KB)

    Issues related to magnetic shielding effects are discussed for inner-coil type thin-film inductors with closed magnetic circuits. The relationship between magnetic shielding effects, mutual inductance, and proximity effects are investigated using the finite integral equation method. The results show that obvious shielding effects occur in the inductors and that the mutual inductance is not influen... View full abstract»

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  • Application to an EMI Noise Filter of a High-Loss CoZrNb/SiO2 Multilayer Film

    Publication Year: 1994, Page(s):78 - 83
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    This paper reports the application of a magnetic alloy/nonmagnetic insulator multilayer film in EMI noise filters. The eddy-current skin effect in the magnetic alloy layers was used to achieve high-loss properties. The thickness of each layer and magnetic anisotropy of a CoZrNb/SiO2 multilayer film were designed such that the film would exhibit high-loss properties in the 30 to 1000 MHz... View full abstract»

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  • Characteristics of a DC-DC Converter Using a Thin Film Microtransformer and a Microinductor

    Publication Year: 1994, Page(s):84 - 89
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1291 KB)

    A thin-film microtransformer and a microinductor were fabricated, using photolithographic techniques for all processes. The microtransformer and microinductor are the same size, 3.5×3.9×0.06 mm3, and both have a layered structure with circular spiral windings between the upper and lower CoFeSiB films. The microtransformer and microinductor were mounted on a primary controlled forward ... View full abstract»

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  • Acute Animal Experiment Using a Linear Motor-Driven Total Artificial Heart

    Publication Year: 1994, Page(s):90 - 97
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2181 KB)

    A linear pulse motor developed by the authors was selected as the actuator for a total artificial heart, because it had the highest thrust/volume ratio, at 0.76 N/ml, of the eight kinds of linear motor considered. This paper summarizes the results of an acute animal experiment using a linear pulse motor-driven total artificial heart (linear TAH). The linear TAH consisted of a linear pulse motor, t... View full abstract»

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  • Performance Evaluation of a Linear Pulse Motor-Driven Intra-Aortic Balloon Pump

    Publication Year: 1994, Page(s):98 - 103
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (745 KB)

    An intra-aortic balloon pump (IABP) is an effective device for supporting circulation in the event of acute heart failure. Small IABP devices are in urgent demand in medical fields. The authors have investigated an IABP device which uses a linear pulse motor (LPM) in order to reduce the device size. This paper discusses the characteristics of the LPM developed by the authors to drive the IABP, and... View full abstract»

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  • Evaluation of the Thrust Constant of a Linear DC Motor for a Pen Recorder

    Publication Year: 1994, Page(s):104 - 109
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2516 KB)

    Pen recorders with moving-coil-type linear dc motors (LDMs) have already been used in practical applications. However, an optimal design has not yet been established within the dimensional limitations of such devices. This paper provides a guideline for optimum design through characteristic analysis of pen recorder units, using a thin, long-stroke LDM. In the LDM, the flux density acting on the co... View full abstract»

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  • Effects of Cores on the Characteristics of an Induction VCM

    Publication Year: 1994, Page(s):110 - 116
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2052 KB)

    An induction voice coil motor (VCM) is composed of a moving metal ring, permanent magnets, cores and exciting coils. The moving ring current induced by an exciting coil current, and the magnetic flux of the permanent magnets, generate a driving force acting on the moving ring. The induction VCM is not able to generate forces below the lower cutoff frequency or above the higher cutoff frequency. Th... View full abstract»

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  • Static Thrust Improvement of a Linear Proportional Solenoid

    Publication Year: 1994, Page(s):117 - 121
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2148 KB)

    A linear proportional solenoid (LPS) is an actuator for a proportional control valve used in hydraulic pressure-control devices. The LPS thrust must be constant over a specified displacement range, and must be proportional to the current. This paper describes simulations of the thrust-displacement characteristics of LPSes as determined by FEM, conducted with the aim of improving the LPM thrust. In... View full abstract»

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  • Performance Analysis of a Linear Oscillatory Actuator for a Milking Unit

    Publication Year: 1994, Page(s):122 - 126
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1115 KB)

    Milking with a conventional milking machine often involves teat trouble, because the pulsation rate of the milking is not variable. A new cylindrical linear oscillatory actuator (CLOA) developed by the authors has a freely variable pulsation rate. This paper analyzes the static and kinetic thrusts of the CLOA. The mover of the CLOA is capable of oscillation at a frequency of 1 Hz with a stroke of ... View full abstract»

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Aims & Scope

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

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Meet Our Editors

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