電気学会論文誌Ａ（基礎・材料・共通部門誌）
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
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132 巻, 6 号
選択された号の論文の23件中1～23を表示しています
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特集：超電導材料の合成と特性評価
特集解説
特集論文
論文
  • プリント基板におけるスリット構造の不要放射特性
    中山 健一, 鹿子嶋 憲一, 武田 茂樹
    2012 年 132 巻 6 号 p. 404-410
    発行日: 2012/06/01
    公開日: 2012/06/01
    DOIhttps://doi.org/10.1541/ieejfms.132.404
    ジャーナル フリー
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    This paper describes the mechanism of radiated emission from a PCB (printed circuit board) with a slit. The multilayer PCB has a power plane and a ground plane, and they make up a parallel resonator. It is reported that when there is a slit at the power plane, the resonant frequencies are varied and the strength of radiated emission is also altered. However, the radiated emission from the PCB with a slit has not been cleared, although it is generally thought that the amount of the radiated emission will be increased. In this paper, the radiated emission from a PCB with a slit is measured and numerically analyzed using FDTD. It has been shown that the amount of radiated emission decrease at 1st mode when there is a slit. And its reason has been also cleared by investigating both amplitude and phase of the tangential electric field on the PCB with a slit.
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  • Study of Particle Acceleration during Reconnection via TS-4 Particle Trajectory Simulations
    Patrick Copinger, Michiaki Inomoto, Toru Ii, Akihiro Kuwahata, Yoshino ...
    2012 年 132 巻 6 号 p. 411-416
    発行日: 2012/06/01
    公開日: 2012/06/01
    DOIhttps://doi.org/10.1541/ieejfms.132.411
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    Particle trajectory calculations were conducted based on TS-4 magnetic probe data in the R-Z plane assuming axisymmetry. An acceleration mechanism for electrons trapped in a merging Spheromak during the formation of a FRC that is causally connected to the out of plane Eφ field during reconnection is found. The energy profile resembles a stair step like motion as the electron is accelerated from the reconnection E field on multiple passes confined to constant magnetic field lines.
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  • Analysis of Magnetic Field Distribution around Connector with Contact Failure
    Yu-ichi Hayashi, Takaaki Mizuki, Hideaki Sone
    2012 年 132 巻 6 号 p. 417-420
    発行日: 2012/06/01
    公開日: 2012/06/01
    DOIhttps://doi.org/10.1541/ieejfms.132.417
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    When contact failure occurs in a connector in a coaxial high-frequency (HF) signal transmission line, an electromagnetic field is radiated around the connector. The authors computed the strength of the magnetic field in the area around the cross section of a connector with contact failure. The results shows a relationship between the current at the contact point and the magnetic field around the transmission line. Using this relationship, we can predict the contact condition by observing the magnetic field around the transmission line.
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  • カーボンナノ材料の創製のためのプラズマプロセシング
    —ナノ構造の合成およびそのプロセス制御のためのモデリング手法—
    須田 善行, 滝川 浩史, 田上 英人
    2012 年 132 巻 6 号 p. 421-427
    発行日: 2012/06/01
    公開日: 2012/06/01
    DOIhttps://doi.org/10.1541/ieejfms.132.421
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    Plasma is a useful tool to synthesize carbon nano-materials including diamond, fullerene, nanotube and graphene. This review introduces the overview of these carbon nano-materials produced by thermal or non-thermal plasmas and also the authors' work related to plasma-enhanced chemical vapor deposition of carbon nanotubes and its correlation with numerical simulation of CH4/H2 feedstock gas plasmas. The amount of carbon atoms in the CNTs grown and that calculated from simulation showed good agreement.
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  • 酸素気泡内直流プラズマによる生成活性種の定量評価
    石井 陽子, 安藤 瑞基, 竹内 希, 池田 圭, 安岡 康一
    2012 年 132 巻 6 号 p. 428-434
    発行日: 2012/06/01
    公開日: 2012/06/01
    DOIhttps://doi.org/10.1541/ieejfms.132.428
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    In this research, concentrations of hydrogen peroxide and dissolved ozone generated by direct current plasma within oxygen bubbles in water were measured. The current magnitude and water conductivity were changed from 1 to 7mA, and from 1 to 100 μS/cm, respectively. The highest efficiency of hydrogen peroxide generation was 0.64g/kWh at 7mA with 100μS/cm solution. The concentration of dissolved ozone decreased with increasing the discharge current, and was almost zero when the current was higher than 5mA. Non-dimensional simulation revealed that the water vapor concentration in bubbles strongly affects the generation of active species. With a large current, the amount of water vaporized into the bubbles enlarged due to a large heat flux from plasma.
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  • 塑性変形による鉄心性能劣化
    開道 力, 新井 聡
    2012 年 132 巻 6 号 p. 435-440
    発行日: 2012/06/01
    公開日: 2012/06/01
    DOIhttps://doi.org/10.1541/ieejfms.132.435
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    This paper discusses the effect of plastic deformation at core manufacturing on the characteristics of cores where non-oriented electrical steel sheets are used as core material. Exciting field and iron loss increase proportionally to plastic deformation in the case of rP<10, where rP is a ratio of plastic deformation to that at yield point. In this region, anomalous eddy currents increase because plastic deformations of crystalline grains are distributed and then the flux distribution is induced. In the case of rP>20, the deterioration tend to saturate, and the increases in magnetic field and iron loss are 1000 to 1500A/m and 2 to 4W/kg. They are related to grain size, and high grade with larger grain may have lager field increase and smaller iron loss increase. Anomalous eddy current losses scarcely increase in this region. In actual motors, the plastic deformation affects iron loss increase although exciting current increases a little.
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  • Hコイル法による高精度鉄損測定のための位相補正
    沓掛 暁史, 城門 由人, 池田 哲, 金田 嗣教, 榎園 正人
    2012 年 132 巻 6 号 p. 441-447
    発行日: 2012/06/01
    公開日: 2012/06/01
    DOIhttps://doi.org/10.1541/ieejfms.132.441
    ジャーナル フリー
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    The accurate magnetic properties of electrical steel sheets are important to develop high-efficiency electromagnetic devices. Especially, the H-coil method is a useful measurement technique of accurate magnetic field strength in single sheet tester. Therefore, we developed the tester of magnetic properties using the H-coil method, we called it the Stress load type - Single Sheet Tester (S-SST), and a problem was found in the iron loss measurement at high flux density, 1.6T or more. In this paper, it is shown that the cause of this problem is phase difference between induced voltage in H-coil and B-coil. In order that the phase difference make BH loop slightly twisted near the tip point, the iron losses are evaluated low. So, we propose the method of determining of phase correction values, these are measured in the absence of a specimen in the S-SST measurement system, and the phase correction method for induced voltage in a coil. Finally, the ideal results of correction on iron loss of non-oriented electrical steel sheets are shown. The proposed method is effective in calibration of a single sheet tester using the H-coil method.
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  • 電気配線用PVCの高温領域における空間電荷形成と絶縁破壊
    三浦 雅和, 福間 眞澄, 岸田 悟
    2012 年 132 巻 6 号 p. 448-455
    発行日: 2012/06/01
    公開日: 2012/06/01
    DOIhttps://doi.org/10.1541/ieejfms.132.448
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    The Polyvinyl chloride (PVC), the most popular insulating material, is used as an insulating material of various electric products. When using an electrical wiring assembly code over the power capacity, PVC could melt by the joule heating and cause an electrical breakdown. Therefore, it is necessary to clarify the electrical breakdown phenomena near the melting point (170°C) in PVC. In this paper, space charge distribution and conduction current have been measured in PVC sheets up to the electrical breakdown in the range from room temperature to 200°C under DC electric field. The breakdown strength decreases with temperature in PVC. Small hetero-space charges are accumulated near both of the electrodes at room temperature region. At high temperature region above 100°C, it is observed that positive charges are injected from anode and move toward the cathode; the electric field is emphasized near the cathode due to the packet-like positive charge in PVC. It shows a thermal breakdown process of the electric fields due to positive charge behavior and conduction current increase with temperature near the melting point in PVC.
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