Improved Efficiency of Magnetic Field Contactless Power Transfer using Relay Circuit with Resonant Frequency Different from Power Supply Frequency
論文No: ページ数: 8 日付: 2024/07/01
著者: 伊藤 将（千葉工業大学大学院工学研究科電気電子工学専攻），相知 政司（千葉工業大学工学部電気電子工学科）
キーワード : 磁界結合型非接触給電，共振回路，センサネットワーク magnetic field coupling type contactless power supply，resonant circuit，sensor network
In this study, a relay resonance circuit is used transmitted power to the sensor module using four-parallel cubic coils, and the efficiency decrease with the change in the transmission distance is investigated experiment ... more
Calibration of the DC Resistance from 10MΩ to 10TΩ with Dual Source Bridge Type High Precision High Resistance Measuring Instrument
論文No: ページ数: 7 日付: 2024/07/01
著者: 征矢 隼人（長野県工業技術総合センター 精密・電子・航空技術部門／公立諏訪東京理科大学 工学部 情報応用工学科），大江 武彦（(国研)産業技術総合研究所 計量標準総合センター 物理計測標準研究部門），染谷 貴史（長野県工業技術総合センター 精密・電子・航空技術部門），金子 晋久（(国研)産業技術総合研究所 計量標準総合センター 物理計測標準研究部門）
キーワード : 高抵抗測定，直流電気抵抗器，直流抵抗標準 high resistance measurement，DC electric resistor，DC resistance standard
We investigated a measurement method using a dual source bridge type high-precision high-resistance measuring instrument ranging from 10MΩ to 10TΩ. All possible uncertainty components of the instrument were evaluated and ... more
We are developing a user-friendly tabletop NMR (Nuclear Magnetic Resonance) quantum computer for student labs. This device enables the observation of quantum behaviors of atomic nuclei and aims to demonstrate quantum alg ... more
The investigation of voids in concrete slabs is a crucial aspect of concrete diagnostics. We have reported that it is possible to efficiently detect the presence of voids by identifying the scattered waveform through an ... more
We investigated equivalent radii of penetration holes in insulating films in order to clarify that discharge diameter and gas temperature distribution shape of impulse arc discharge during penetrating insulating films. W ... more
It has been required to develop simulation of vacuum arcs as a tool to aid electrode design in vacuum circuit breakers. Although the development of electromagnetic thermo-fluid simulations for vacuum arcs has been report ... more
This paper describes the results of probe diagnostics in atmospheric pressure argon plasma jets (APJs) for the clarification of their internal structure. The probe is consisted with a fine stainless-steel wire and a resi ... more
The electrospray deposition (ESD) method is wet process used solution spray formed by electric field between the needle of solution contained syringe and conductive substrate or insulated electrode. In this study, we fab ... more
Sulfur hexafluoride (SF6) is a powerful insulating gas, yet its global warming potential (GWP) of 25,200 compels us to urgently seek eco-friendly alternatives. Various experiments and computations have been conducted to ... more
Magnetic Materials for High-Frequency Applications
論文No: ページ数: 8 日付: 2024/06/01
著者: 直江 正幸（（公財）電磁材料研究所）
キーワード : 高周波磁性材料，表皮効果，磁気共鳴，磁性複合材料，磁性膜 magnetic materials for high-frequency，skin effect，magnetic resonance，magnetic composites，magnetic films
This paper explains and introduces the magnetic materials for high-frequency applications, e.g., ferrites, composites, and films. High resistivity and downsizing are necessary for a reduction of Joule losses (skin effect ... more
Random Number Generator Using Magneto Optic Effect
論文No: ページ数: 5 日付: 2024/06/01
著者: 水戸 慎一郎（東京工業高等専門学校），荒井 俊亮（東京工業高等専門学校）
キーワード : 乱数生成器，磁区，磁性ガーネット random number generator，magnetic domain，magnetic garnet
Random numbers are widely used in information technologies such as security, simulation, and machine learning. With the development of information technology, there is a need for technology to provide high-quality random ... more
Fabrication of Fe-based Nanocrystalline Spherical and Flake Powder Composite Magnetic Cores for Tens of MHz and their Application to Planar Power Inductor
論文No: ページ数: 8 日付: 2024/06/01
著者: Soichi Kimura (Department of Electrical and Computer Engineering, Faculty of Engineering, Shinshu University), Kota Koike (Department of Electrical and Computer Engineering, Faculty of Engineering, Shinshu University), Motohiro Kanai (Department of Electrical and Computer Engineering, Faculty of Engineering, Shinshu University), Ryohei Miyata (Department of Electrical and Computer Engineering, Faculty of Engineering, Shinshu University), Toshitaka Minamisawa (Department of Electrical and Computer Engineering, Faculty of Engineering, Shinshu University), Kousuke Miyaji (Department of Electrical and Computer Engineering, Faculty of Engineering, Shinshu University), Makoto Sonehara (Department of Electrical and Computer Engineering, Faculty of Engineering, Shinshu University), Toshiro Sato (Department of Electrical and Computer Engineering, Faculty of Engineering, Shinshu University)
キーワード : Fe-based nanocrystalline alloy，composite magnetic core，planar power inductor，beyond 10MHz，DC-DC converter
Two types of Fe-based nanocrystalline powder composite magnetic core for tens of MHz were fabricated and applied to the planar power inductor. One was Fe-Si-B-Nb-Cu-C spherical fine powder composite magnetic core for a c ... more
Novel power semiconductor devices with high withstand voltage and high-speed operation use digital isolators for isolated transmission of gate drive signals. The isolators are required to have the similar level of withst ... more
Synthesis of Extended Cauer-Equivalent Circuit of Magnetic Components Considering Multiple Resonant Peaks
論文No: ページ数: 8 日付: 2024/06/01
著者: 佐藤 佑樹（青山学院大学），松本 洋和（青山学院大学），五十嵐 一（北海道大学），河野 健二（日本テキサス・インスツルメンツ合同会社）
キーワード : 磁気部品，Cauer回路，寄生キャパシタンス，共振点 magnetic component，Cauer circuit，parasitic capacitance，resonant point
This paper introduces an extended Cauer-equivalent circuit model of magnetic components that can represent both eddy-current effects and capacitive properties. As this model considers the skin and proximity effects of th ... more
Study on Electrical and Magnetic Properties of Toroidal Cores Consisted of Electrolytic Iron Particles with Different Particle Shapes
論文No: ページ数: 6 日付: 2024/06/01
著者: 児玉 雄大（東北大学大学院工学研究科），Nguyen Phuong（東北大学大学院工学研究科），宮崎 孝道（東北大学工学部），室賀 翔（東北大学大学院工学研究科），遠藤 恭（東北大学大学院工学研究科／東北大学先端スピントロニクス研究開発センター）
キーワード : 磁性コア，磁気損失，軟磁性材料，電解鉄粉 magnetic cores，magnetic losses，soft magnetic material，electrolytic iron powder
The electrical and magnetic properties of the core composed of Electrolytic iron particles with different shapes (needle shape, flakey shape, and spherical shape) were investigated. In the frequency range below several t ... more
In order to use pure water as an alternative to insulating oil, the conductivity of pure water must be at least four orders of magnitude lower. It is important to investigate the frequency characteristics of relative die ... more
For the self-inductance of single-layer regular polygonal coils, exact formulas applicable to coils with an arbitrary side number have been obtained, and their validity has been verified by experiment. In this letter, we ... more
We performed the ball-on-disk tribological test for tool steels nitrided by the atmospheric-pressure pulsed-arc plasma jet to investigate improvement of the wear resistance. The test with an alumina ball proved that the ... more
In order to reduce power consumption, research is being actively conducted to reduce iron losses of electrical steel sheets, which are the common core material of electric motors. Semi processed materials usually need to ... more
Investigation of Magnetic Field Annealing of Amorphous Magnetic Material by using Permanent Magnets
論文No: ページ数: 5 日付: 2024/05/01
著者: 伊藤 京之介（大分大学），佐藤 尊（大分大学），戸高 孝（大分大学）
キーワード : アモルファス磁性材料，熱処理，永久磁石，鉄損 amorphous magnetic material，heat treatment，permanent magnet，iron loss
Heat treatment in a magnetic field is necessary to improve magnetic properties of the Fe-based amorphous magnetic materials (Fe-Si-B). In this paper, we proposed a magnetic-field annealing method with SmCo permanent magn ... more
We investigated AC breakdown characteristics of ultra violet curable epoxy resin (UV-EP) with nitrogen fine bubbles (FBs) in order to improve insulating properties of UV-EP. As a result, it was found that self-made FB ge ... more
Understanding thermal conduction mechanism in polymer insulating materials is crucial for the development of insulating materials with high thermal conductivity (TC). This paper reveals the difference in thermal conducti ... more
Experimental Study on Spherical Winding System for Magnetically Coupling Type Non-contact Omnidirectional Power Transfer Coil
論文No: ページ数: 7 日付: 2024/04/01
著者: 大宜見 祐貴（千葉工業大学大学院工学研究科電気電子工学専攻），相知 政司（千葉工業大学工学部電気電子工学科）
キーワード : 磁界結合型非接触給電，全方位給電，送電コイルの形状，理論的最大効率 magnetic field coupling type contactless power supply，omnidirectional power supply，shape of transmission coil，theoretical maximum efficiency
In recent years, contactless power transfer technology has attracted attention as a new power transfer technology. However, there is a problem that the efficiency of contactless power transfer with coupled magnetic field ... more
Recent methods using thermistors as an early detection of skin cancer require the higher resolution of 5 mK. Previously, the authors developed a vacuum insulated temperature device that calibrates the resistance temperat ... more
A Consideration of Heavy Rainfall Detection Method Using Multi-Parameter Phased Array Radar, Convolutional Neural Network, and Long Short-Term Memory Network
In order to mitigate weather disasters caused by heavy precipitations, it is important to observe 3-dimensional precipitation structure in a storm with high temporal resolution. In recent years, the development of phased ... more
A Study on Motor Structure with Boost Reactor Function
論文No: ページ数: 6 日付: 2024/04/01
著者: 張 磊（秋田大学），吉田 征弘（秋田大学），櫻井 将（秋田大学），半田 修士（秋田大学），田島 克文（秋田大学）
キーワード : リアクトルとモータの一体構造，永久磁石モータ，小型軽量化 integrated structure of reactor and motor，permanent magnet motor，downsizing and lightening
In recent years, due to the demand for miniaturization and weight reduction of magnetic devices such as in-vehicle drive motors, the authors have focused on miniaturization of the system through the fusion of devices. In ... more
Space Charge Profiles in Elastomer Sheets with Laminating Area of Vertical Direction against Electric Field Direction
論文No: ページ数: 7 日付: 2024/04/01
著者: 犬塚 通子（豊田工業高等専門学校），光本 真一（豊田工業高等専門学校），栗本 宗明（名古屋大学），藤井 雅之（大島商船高等専門学校），福間 眞澄（松江工業高等専門学校）
キーワード : 空間電荷，積層エラストマー，積層方向 space charge，laminate elastomer sheets，laminating direction
In this paper, the space charge profiles in elastomer sheets with laminating area of vertical direction against electric field direction is investigated. Samples were prepared using a stereolithographic 3D printer. Sampl ... more
This paper proposes a science workshop in which children find the science around them by themselves, think about experiments, prepare experiments, imagine the results of experiments, and lead the results. This workshop i ... more
The Synergetic Effect of Nitrogen-Doped Carbon Dot and Short Carbon Fiber Reinforced Epoxy Composite on Electromagnetic Shielding in X-Band and Mechanical Properties
論文No: ページ数: 8 日付: 2024/03/01
著者: Gandluri Parameswarreddy (Department of Electrical Engineering, IIT Madras), Nirmiti Mate (Department of Chemistry, IIT Indore), Kavitha Arunachalam (Department of Engineering Design, IIT Madras), Ramanujam Sarathi (Department of Electrical Engineering, IIT Madras), Shaikh M. Mobin (Department of Chemistry, IIT Indore), Hisayuki Suematsu (Extreme Energy-Density Research Institute, Nagaoka University of Technology)
キーワード : electromagnetic interference，X-band frequency，nitrogen-doped carbon dot，short carbon fiber
The present study aims on the fabrication of hybrid epoxy composite with zero-dimensional (0D) filler nitrogen-doped carbon dot (N-CDs) and short carbon fiber (SCF) for the electromagnetic interference (EMI) shielding in ... more
