Journal of the Magnetics Society of Japan
Online ISSN : 1880-4004
Print ISSN : 0285-0192
ISSN-L : 0285-0192
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Volume 26, Issue 3
Displaying 1-3 of 3 articles from this issue
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Contributed Paper
  • Operating Characteristics of Orthogonal Core Phase Shifter
    K. Nakamura, S. Akatsuka, T. Ohinata, M. Kawakami, M. Maeda, H. Sato, ...
    2002 Volume 26 Issue 3 Pages 143-146
    Published: 2002
    Released on J-STAGE: December 12, 2006
    DOIhttps://doi.org/10.3379/jmsjmag.26.143
    JOURNAL OPEN ACCESS
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    Rising demand for electric power has heightened the need for flow control in existing power systems.
    An orthogonal core has merit for a power controller, including simple construction and high reliability, because it consists of only a pair of cores and their windings. The orthogonal core can control net inductance of secondary windings easily and continuously.
    This paper presents an orthogonal core phase shifter for flow control in an electric power system. The phase shifter is constructed with the variable inductors and transformers. For reduction of harmonic currents, the orthogonal core utilizes wedge gaps and tertiary windings. In this paper, we examine the fundamental characteristics of the orthogonal core phase shifter.
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  • Environment-frendly Electromagnetic Wave Absorber Using Bearing Grinding Sludge
    H. Kawai, Y. Nishimura, H. Takagi
    2002 Volume 26 Issue 3 Pages 147-152
    Published: 2002
    Released on J-STAGE: December 12, 2006
    DOIhttps://doi.org/10.3379/jmsjmag.26.147
    JOURNAL OPEN ACCESS
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    At a bearing manufacturing plant, a large quantity of grinding sludge is discharged from finish machining process. The microstructure of this sludge is a fiber form which entangles naturally. Raw sludge is not an electromagnetic wave absorber because of its conductivity. The sludge was therefore ground into minute particles by a mechanical alloying method (MA). An electromagnetic wave absorber was then produced using MA-treated bearing grinding sludge for magnetic loss factor. These electromagnetic wave absorbers had practical efficiency at Blue Tooth frequency (2.45 GHz) and ETC frequency (5.8 GHz).
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  • Measurement of Surfece Force of Fine Particles at a Short Distance in a Magnetic Fluid under an Electric and Magnetic Field
    T. Miyazaki, A. Shibayama, T. Fujita
    2002 Volume 26 Issue 3 Pages 153-156
    Published: 2002
    Released on J-STAGE: December 12, 2006
    DOIhttps://doi.org/10.3379/jmsjmag.26.153
    JOURNAL OPEN ACCESS
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    Measurement of surface force was performed using an improved surface force apparatus. This apparatus differs from the original SFA employed to measure the surfaces distance. The surface distance measurement method used this time uses dynamic, rather than optical, measurement. This allows improved surface force measurement apparatus based on solution of the low transmission coefficient. Surface force can be measured under both magnetic and electric fields.
    Based on the results of both surface force measurements, the diameter of magnetite particles coated by active agent was derived from the surfaces distance during the action of the repulsive force.
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