Faculty Profiles - OGAWA Jun

MISC - OGAWA Jun

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Analysis of Drive Characteristics of Large Scale Synchronous Motor Applying No-insulation HTS Coils to Field Winding

福井聡, 吉田偲生, 原山亨介, 小川純, 石山敦士

電気学会全国大会講演論文集(CD-ROM) 2024 2024

Influence of n-value of high-temperature superconducting tape under overcurrent condition on AC loss characteristics

山田有宇斗, 鍋谷知廣, 荒川稜太, 小川純, 福井聡

電気学会研究会資料(Web) ( MC-24-001-014/ASC-24-001-014 ) 2024

Development of 750kW-class induction heating device for aluminum extrusion molding using HTS magnets (1)-Device overview

緒方康博, 伊東徹也, 河島裕, 正孝幸, 福井聡, 小川純

低温工学・超電導学会講演概要集 107th 2024

Analytical Investigation of AC Losses in High Temperature Superconducting Coils for Magnetic Particle Imaging

本間匠, 荒川稜太, 青木光星, 小川純, 福井聡

電気学会研究会資料(Web) ( MC-24-016-025/ASC-24-016-025 ) 2024

Influence of thermal insulation section on AC overcurrent conditions of high-temperature superconducting tapes

鍋谷知廣, 荒川稜太, 村松直斗, 松原拓未, 鈴木将之伸, 小川純, 福井聡

電気学会研究会資料(Web) ( MC-24-016-025/ASC-24-016-025 ) 2024

Development of 400 kW-class DC Induction Heating Device Using HTS Magnet for Aluminum Extrusion Process Continuous Repetitive Heating Test and Evaluation of Soundness of HTS Magnet

伊東徹也, 伊東徹也, 福井聡, 河島裕, 緒方康博, 正孝幸, 古瀬充穂, 渡部智則, 長屋重夫, 小川純, 森下勇樹, 長岡孝, 府山伸行, 縄稚典生

低温工学 58 ( 3 ) 2023

Evaluation of current distribution and AC loss in superconducting coils for wireless power transmission

山口敦也, LI Yutong, 伊藤俊輔, 杉妻和翔, 小川純, 福井聡, 關谷尚人

電気学会研究会資料(Web) ( ASC-23-001-014.016 ) 2023

Development of 400 kW-class DC Induction Heating Device Using HTS Magnet for Aluminum Extrusion Process: Continuous Repetitive Heating Test and Evaluation of Soundness of HTS Magnet

伊東徹也, 伊東徹也, 福井聡, 小川純, 河島裕, 緒方康博, 正孝幸, 古瀬充穂, 渡部智則, 長屋重夫, 森下勇樹, 長岡孝, 府山伸行, 縄稚典生

低温工学・超電導学会講演概要集 105th 2023

Analysis of Motor Characteristics of Large Scale HTS Synchronous Motor Using No-insulation Field Winding

福井聡, 塩澤勇太郎, 吉田偲生, 小川純, 石山敦士

低温工学・超電導学会講演概要集 105th 2023

Basic Investigation of Transport Characteristics of No-insulation HTS Racetrack Coil

栗賀勇輔, 藤田悠斗, 高桑天通希, 小川純, 福井聡

低温工学・超電導学会講演概要集 106th 2023

Electric Design of Experimental Model for Axial Gap HTS Induction Motor and Analysis of Its Motor Characteristics

纐纈このみ, 鈴木優輔, 市橋駿, 小川純, 福井聡

低温工学・超電導学会講演概要集 106th 2023

Analysis of Vector Control Characteristics of Large Scale HTS Synchronous Motor Using No-insulation Field Winding

吉田偲生, 原山亨介, 小川純, 福井聡, 石山敦士

低温工学・超電導学会講演概要集 106th 2023

Analytical Study of AC Loss Characteristics in HTS tapes under Overcurrent Conditions

小川純, 福井聡, 山田有宇斗, 伊藤俊輔, 野口陽平, 鍋谷知廣, 荒川稜太

低温工学・超電導学会講演概要集 106th 2023

Development of induction heating device for aluminum extrusion molding using HTS magnets (5)-Summary

伊東徹也, 伊東徹也, 福井聡, 小川純, 河島裕, 緒方康博, 正孝幸, 古瀬充穂, 渡部智則, 長屋重夫, 森下勇樹, 長岡孝, 府山伸行, 縄稚典生

低温工学・超電導学会講演概要集 104th 2022

Analysis of Motor Characteristics of Large Scale HTS Synchronous Motor Using No-insulation Field Winding

福井聡, 佐々木泰雅, 塩澤勇太郎, 小川純

電気学会全国大会講演論文集(CD-ROM) 2022 2022

Development of induction heating device for aluminum extrusion molding using HTS magnets (4)-Overview of heating test at rated power

伊東徹也, 伊東徹也, 福井聡, 小川純, 河島裕, 緒方康博, 正孝幸, 古瀬充穂, 渡部智則, 長屋重夫, 森下勇樹, 長岡孝, 府山伸行, 縄稚典生

低温工学・超電導学会講演概要集 103rd 2022

Analysis of Dynamic Characteristics of Large Scale HTS Synchronous Motor Using No-insulation Field Winding

塩澤勇太郎, 吉田偲生, 小川純, 福井聡

電気学会研究会資料(Web) ( ASC-22-008-012 ) 2022

HTSマグネットを用いたアルミビレット加熱装置の開発

伊東徹也, 伊東徹也, 福井聡, 小川純, 河島裕, 緒方康博, 杉本志郎, 正孝幸, 古瀬充穂, 渡部智則, 長屋重夫

電気学会全国大会講演論文集(CD-ROM) 2022 2022

Development and AC Loss Evaluation of HTS Armature Winding for 50 kW-class Fully HTS Induction/Synchronous Motor

福井聡, 齊藤亮, 富井慶太, 高橋京祐, 小川純, 古瀬充穂, 中村武恒

低温工学・超電導学会講演概要集 101st 2021

Electric Design and Motor Characteristics of 3 MW-class Fully-HTS Induction Motor for Aircraft Propulsion

福井聡, 根津太貴, 中野真聖, 武田大樹, 小川純

低温工学・超電導学会講演概要集 101st 2021

Study on Axial Gap Type HTS Induction Motor for Aircraft Application

福井聡, 小川純

電気学会研究会資料(Web) ( MC-21-001-008/ASC-21-001-008 ) 2021

Development of induction heating device for aluminum extrusion molding using HTS magnets (3)-Overview of the heating test-

伊東徹也, 伊東徹也, 福井聡, 小川純, 河島裕, 緒方康博, 正孝幸, 杉本志郎, 古瀬充穂, 渡部智則, 長屋重夫, 森下勇樹, 長岡孝, 府山伸行, 縄稚典生

低温工学・超電導学会講演概要集 102nd (CD-ROM) 2021

Influence of trapped magnetic field in HTS bulk on direction of multi-pulse magnetic field

2020 ( 2 ) 15 - 17 2020.10

Flux Jump and Its Behavior in Pulsed-Field Magnetizing Process for Mg-B Bulk Magnet

岡徹雄, 沖隼光, 山中健悟, 須藤正照, DADIEL Longji, DORGE Remi, HAESSLER Wolfgang, SCHEITER Juliane, 小川純, 福井聡, BERGER Kevin, BADICA Peter, NOUDEM Jacques, 坂井直道, MILYALA Muralidhar, 村上雅人, 横山和哉

低温工学・超電導学会講演概要集 99th 2020

パルス着磁したMg-Bバルク超伝導体からの磁場散逸現象

岡徹雄, 横山和哉, 沖隼光, 山中健悟, 小川純, 福井聡, SCHEITER Juliane, HAESSLER Wolfgang, DADIEL Longji, 坂井直道, MILYALA Muralidhar, 村上雅人, NOUDEM Jacques

低温工学・超電導学会講演概要集 98th 2019

磁界の波形がRE線の磁化損失特性に及ぼす影響の検討

小川純, 近藤和人, 福井聡

低温工学・超電導学会講演概要集 98th 2019

全方向磁界を印加した条件におけるBi系線材とY系線材の磁化損失のモデル化

小川純, 福井聡, 岡徹雄, YAN Panpan, 金森光紀

低温工学・超電導学会講演概要集 96th 104 2018.5

高温超伝導バルク磁石への逆磁場を用いた複数回パルス着磁

岡徹雄, 武田晃, 清水紅旭, 小川純, 福井聡, 佐藤孝雄, 横山和哉, 村上雅人

低温工学・超電導学会講演概要集 96th 93 2018.5

バルク超伝導ホウ化マグネシウムのパルス着磁における磁束散逸現象

岡徹雄, 武田晃, 沖隼光, 小川純, 福井聡, 佐藤孝雄, HAESSLER Wolfgang, 横山和哉

電気学会全国大会講演論文集(CD-ROM) 2018 ROMBUNNO.5‐166 2018.3

A review article: Compact magnetic field generators containing HTS bulk magnets cooled by refrigerators and their feasible applications

Tetsuo Oka, Jun Ogawa, Satoshi Fukui, Takao Sato, Tomohito Nakano, Kazuya Yokoyama, Takashi Nakamura, Hiroyuki Fujishiro, Koshichi Noto

High-Temperature Superconductors: Occurrence, Synthesis and Applications 291 - 306 2018.1

© 2018 Nova Science Publishers, Inc. Various types of strong magnetic field generators with use of HTS bulk magnets and the small-scale refrigerators have been actually proposed and experimentally estimated for the feasible applications. The most characteristic feature of bulk magnets is regarded as compact and strong field generators with respect to their magnetic field spaces or their machine structures of themselves. Among them, the magnetic flux density of the face-toface magnetic poles reached 3.2 T and 4.4 T when they were activated by the pulsed field magnetization and the field cooling method, respectively. Furthermore, a very small bulk magnet generating 2.8 T and the system featured by the wide magnetic poles containing seven magnets have been constructed with use of ST pulse tube coolers in order to expand the feasible application areas. On the other hand, although the bulk magnets are characterized by their steep field distributions, we attempted to gain the uniform magnetic field space, and successfully achieved the uniformity of 385 ppm in 4 mm range by combining the deformed magnetic field profiles which generated between the face-to-face magnetic poles. The performances of these unique systems have exceeded those of the conventional electromagnet or any permanent magnets by far, demonstrating the superiority to other strong magnetic field generators.

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内層の電磁条件の違いによる二層高温超伝導ケーブルの交流損失特性

小川純, 福井聡, 岡徹雄, 小川智也, 菅井護

低温工学・超電導学会講演概要集 95th 164 2017.11

Magnetic Separation Using HTS Bulk Magnet for Cs-Bearing Fe precipitates

T. Oka, K. Ichiju, S. Sasaki, J. Ogawa, S. Fukui, T. Sato, M. Ooizumi, K. Yokoyama, S. Aoki, N. Ohnishi

Journal of Physics: Conference Series 897 2017.9

© Published under licence by IOP Publishing Ltd. A peculiar magnetic separation technique has been examined in order to remove the Cs-bearing Fe precipitates formed of the waste ash from the withdrawn incinerator furnaces in Fukushima. The separation system was constructed in combination with high temperature superconducting bulk magnets which generates the intensive magnetic field over 2 T, which was activated by the pulsed field magnetization process. The separation experiment has been operated with use of the newly-built alternating channel type magnetic separating device, which followed the high-gradient magnetic separation technique. The magnetic stainless steel filters installed in the water channels are magnetized by the applied magnetic fields, and are capable of attracting the precipitates bearing the Fe compound and thin Cs contamination. The experimental results clearly exhibited the positive feasibility of HTS bulk magnets.

DOI： 10.1088/1742-6596/897/1/012024

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HTSバルク磁石を用いたNiメッキ廃液からのNi化合物の磁気分離によるリサイクル技術

岡徹雄, 佐々木翔, 小川純, 福井聡, 佐藤孝雄, 大泉学, 辻村盛夫, 横山和哉

低温工学・超電導学会講演概要集 94th 159 2017.5

通電波形が交流通電損失特性に及ぼす影響についての実験的評価

小川純, 杵淵修造, 青山峻, 福井聡, 岡徹雄

低温工学・超電導学会講演概要集 94th 63 2017.5

バルク超伝導体の複数回パルス着磁における逆磁場印加での磁場捕捉挙動

岡徹雄, 原健介, 武田晃, 小川純, 福井聡, 佐藤孝雄, 横山和哉

電気学会全国大会講演論文集(CD-ROM) 2017 ROMBUNNO.5‐124 2017.3

Development of Test Device for Aluminum Metal Melting by Electromagnetic Induction Heating Using HTS Coils

2017 ( 1 ) 59 - 63 2017.1

セシウムを含む鉄化合物沈殿の高温超電導バルク磁石を使った磁気分離

岡徹雄, 一重佳那, 佐々木翔, 小川純, 福井聡, 佐藤孝雄, 大泉学, 横山和哉, 青木茂幸, 大西徳幸

日本磁気科学会年会プログラム・要旨集 11th 44‐45 2016.11

AC Loss Reduction in HTS Coil with Iron Core Using Flux Modulation by Ferromagnetic Material

2016 ( 13 ) 19 - 22 2016.6

Magnetic Separation for Recovering Ni Compounds from Plating Waste with Use of HTS Bulk Magnets

T. Oka, Y. Takayanagi, S. Machida, K. Ichiju, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, M. Tsujimura, K. Yokoyama

IEEE Transactions on Applied Superconductivity 26 ( 4 ) 2016.6

Language：English Publisher：Institute of Electrical and Electronics Engineers Inc.

A characteristic magnetic separation technique has been developed to recycle the Ni resource from the waste fluid of electroless Ni-plating processes. Since the plating waste still contains high concentration of Ni ions after several cycles of plating processes, the magnetic separation experiments were conducted to collect the precipitates containing Ni compounds. After extracting the fine NiHPO3 precipitate from the waste liquid, we synthesized the NiSO4 crystals from the NiHPO3 precipitates through the reaction with the concentrated sulfuric acid. The open-gradient magnetic separation was employed to separate the NiSO4 crystals from the mixed slurry composed of the NiSO4 and the NiHPO3 due to the difference between their magnetic properties. The experiments were practically conducted with use of the Gd123-based HTS bulk magnets with very steep gradient of magnetic field of over 100 T/m, which were activated to the magnetic fields of 1.53 and 1.95 T by the pulsed field magnetization process operated at 35 K. The ratio of NiSO4 content in the collected slurry attracted to the magnetic poles reached up to 98%, which suggests that the paramagnetic NiSO4 crystals are preferentially collected by the magnetic force from the mixed slurry in the strong magnetic field generated by the HTS bulk magnet.

DOI： 10.1109/TASC.2016.2517923

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超伝導バルク磁石を用いたセシウムの磁気分離

一重佳那, 佐々木翔, 小川純, 福井聡, 佐藤孝雄, 岡徹雄, 横山和哉, 青木茂幸

低温工学・超電導学会講演概要集 93rd 109 2016.5

HTSバルク磁石への複数回パルス着磁;去における残留磁場分布形状に対する磁束侵入

岡徹雄, 原健介, 小川純, 福井聡, 佐藤孝雄, 横山和哉, 村上明

低温工学・超電導学会講演概要集 93rd 42 2016.5

複数枚積層したディスク型MgB<sub>2</sub>バルク超伝導体のパルス着磁

宮崎泰輔, 稲垣智大, 小川純, 福井聡, 佐藤孝雄, HAESSLER Wolfgang, 横山和哉, 岡徹雄

電気学会全国大会講演論文集(CD-ROM) 2016 ROMBUNNO.5‐106 2016.3

超伝導バルク磁石における逆磁場を用いた複数回パルス着磁の研究

原健介, 下田竜也, 太田博之, 阿久津裕哉, 小川純, 福井聡, 佐藤孝雄, 岡徹雄, 横山和也

電気学会全国大会講演論文集(CD-ROM) 2016 ROMBUNNO.5‐105 2016.3

HTSバルク磁石を使ったIPMモータ回転子の新しい着磁法とその磁場特性

岡徹雄, 渡邊大史, 玄海亨, 福井聡, 小川純, 佐藤孝雄, 中野智仁, 横山和哉

電気学会全国大会講演論文集(CD-ROM) 2016 ROMBUNNO.5‐107 2016.3

Uniform Magnetic Field between Face-to-Face HTS Bulk Magnets Combining Concave and Convex Magnetic Field Distributions

T. Oka, Y. Takahashi, S. Yaginuma, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, T. Nakamura

Physics Procedia 81 45 - 48 2016

Language：English Publisher：Elsevier B.V.

The authors have been attempting to obtain the uniform magnetic field distribution in the space between the face-to-face HTS bulk magnets. The magnetic poles containing the HTS bulk magnets are usually characterized as non-uniform magnetic field distribution. Since the distributions show the conical or convex shapes, it is difficult to obtain the uniform magnetic field spaces even when the magnetic poles would be placed face-to-face. The authors have modified the shape of the distribution of one-side magnetic pole by attaching an iron plate on the surface, and formed the concave magnetic field distribution on the pole surface. The steep concave or convex distributions at each pole surface change to be flat with increasing distance from the pole surface. After the experimental result recording the best uniformity of 358 ppm by combining the concave and convex field distributions face-to-face, we attempted to simulate the feasible performance in this configuration. In the numerical simulation, the concave field distribution modified by attaching an imaginary spiral coil on the pole surface was coupled with the original convex field. We succeeded in obtaining the best uniformity of 30 ppm at 1.1 T in 4 x 4 mm2 x-y plane at 7 mm distant from the pole surface in the gap of 30 mm. This result suggests that the concave and convex magnetic field distributions compensate the field uniformity with each other with keeping the magnetic field strength in the gap, and also suggests the novel compact NMR/MRI devices in the future.

DOI： 10.1016/j.phpro.2016.04.019

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二層ツイスト高温超伝導ケーブルのツイスト方向による交流損失特性への影響

小川純, 福井聡, 岡徹雄, 佐藤孝雄, 原祐輔, 東條竜児, 小川智也

低温工学・超電導学会講演概要集 92nd 227 2015.12

超伝導バルク磁石を用いたセシウムの磁気分離

町田祥平, 高柳優也, 一重佳那, 小川純, 福井聡, 佐藤孝雄, 大泉学, 岡徹雄, 大西徳幸

低温工学・超電導学会講演概要集 91st 52 2015.5

二層ツイスト高温超電導ケーブルの部分的断熱による交流損失の熱的測定

原祐輔, 東條竜児, 小川純, 福井聡, 岡徹雄, 佐藤孝雄

低温工学・超電導学会講演概要集 91st 54 2015.5

鉄心内に挿入された高温超伝導集合導体の交流損失特性の実験的評価

多田寛明, 桜井達哉, 吉井佑斗, 佐野佑樹, 小川純, 福井聡, 岡徹雄, 佐藤孝雄

低温工学・超電導学会講演概要集 91st 55 2015.5

高温超伝導バルク磁石のパルス着磁における捕捉磁場の散逸現象の評価

岡徹雄, 太田博之, 下田竜也, 原健介, 小川純, 福井聡, 佐藤孝雄, 横山和哉

低温工学・超電導学会講演概要集 91st 172 2015.5

高温超伝導バルク磁石のパルス着磁における異方的な磁場侵入挙動

岡徹雄, 太田博之, 下田達也, 小川純, 福井聡, 佐藤孝雄, 横山和哉, 村上明, LANGER Marco

電気学会全国大会講演論文集(CD-ROM) 2015 ROMBUNNO.5-088 2015.3

HTSバルク磁石を用いた硫酸ニッケル結晶のOGMS

高柳優也, 町田祥平, 一重佳奈, 福井聡, 小川純, 佐藤孝雄, 大泉学, 岡徹雄, 横山和哉, 辻村盛男

電気学会全国大会講演論文集(CD-ROM) 2015 ROMBUNNO.5-087 2015.3

Attempt to generate a strong and uniform magnetic field by face-to-face HTS bulk elements in a magnet system

Tetsuo Oka, Eri Hirayama, Yasuhiro Takahashi, Tomoaki Kanai, Jun Ogawa, Satoshi Fukui, Takao Sato, Kazuya Yokoyama, Takashi Nakamura

Physics Procedia 67 1005 - 1009 2015

© 2015 The Authors. A unique experimental attempt aiming to obtain a uniform magnetic field space as required for NMR has been carried out with use of HTS bulk magnets. The magnetic poles were activated as 1.8 T (North) and 1.4 T (South) at 30 K by applyinga pulsed magnetic field up to 7 T, and positioned face-to-face with gaps less than 70 mm. The uniformity of the magnetic field required for detecting the NMR signals isless than 1,500 ppm at more than 0.3 T in the cross sectional plane of 2 x 2 mm2. After thepreliminary trials whichrevealed auniformity of 5,421 ppm at 0.44 T in a70 mm gap, we attached a ferromagnetic iron plate to a magnetic pole surface to change the magnetic field distribution to be concave. The best uniformity of 358 ppm at 1.11 T was obtained at 9 mm distance from the iron plate surface in a gap of 30 mm. It is stated that the concave magnetic field distribution was compensated by the counter conical-shape field, resulting in the uniform field plane.

DOI： 10.1016/j.phpro.2015.06.187

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逆磁場を用いた複数回パルス着磁の検討

下田竜也, 太田博之, 原健介, 佐藤孝雄, 小川純, 福井聡, 岡徹雄, 横山和哉

低温工学・超電導学会講演概要集 90th 53 2014.11

高温超伝導対向型バルク磁石における均一な磁場分布のシミュレーション解析

金井智亮, 高橋康宏, 佐藤渉, 福井聡, 小川純, 佐藤孝雄, 仲村高志, 岡徹雄

低温工学・超電導学会講演概要集 90th 16 2014.11

IPMモータ回転子に埋め込まれた永久磁石のHTSバルク磁石による新しい着磁方法

岡徹雄, 渡邊大史, 玄海亨, 川崎信隆, 福井聡, 小川純, 佐藤孝雄, 中野智仁, 横山和哉

低温工学・超電導学会講演概要集 90th 8 2014.11

超伝導バルクの物質特性がパルス着磁過程に及ぼす影響の解析的検討

渡辺直土, 小川純, 福井聡, 岡徹雄, 佐藤孝雄

低温工学・超電導学会講演概要集 89th 18 2014.5

2個の種結晶から結晶成長させたYBCOバルク磁石の選択的な磁束侵入

岡徹雄, 堀内琢磨, 菊田淳, 小川純, 福井聡, 佐藤孝雄, 横山和哉, LANGER Marco

低温工学・超電導学会講演概要集 89th 17 2014.5

挿入された高温超電導線材の位置及び種類による交流損失特性への影響

桜井達哉, 伏見侑, 小川純, 福井聡, 岡徹雄, 佐藤孝雄

低温工学・超電導学会講演概要集 89th 56 2014.5

磁場形状を変化させた複数回パルス着磁における磁束侵入研究

太田博之, 木伏貴映, 下田竜也, 菊田淳, 小川純, 福井聡, 岡徹雄, 横山和哉

低温工学・超電導学会講演概要集 89th 16 2014.5

対向配置した高温超伝導バルク磁石を用いた均一な磁場空間の生成

岡徹雄, 平山絵梨, 金井智亮, 高橋康宏, 福井聡, 小川純, 佐藤孝雄, 横山和哉, 仲村高志

電気学会全国大会講演論文集(CD-ROM) 2014 ROMBUNNO.5-168 2014.3

Magnetic separation technique using high temperature superconducting bulk magnets and application to plating liquid waste treatment

T. Oka, H. Fukazawa, N. Yoshizawa, Y. Takayanagi, J. Ogawa, S. Fukui, T. Sato, M. Ooizumi, M. Tsujimura, K. Yokoyama

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 61 ( SUPLL.1 ) 2014

A magnetic separation technique has been conducted to recycle the nickel (Ni) element from the waste fluid of electroless Ni plating processes. The experiment was operated using the face-to-face type electromagnet generating 1.96 T and the data was compared to those in the case of the high temperature superconducting bulk magnet which generates 3.45 T. In the electroless plating processes, the plating fluid containing high concentration of Ni ions is disposed after several turns of the plating cycles when the concentration of phosphite ions exceeds a certain level. In order to extract the Ni element at first, we formed the coarse Ni-sulfate crystals with the sizes over 1 mm from the Ni-phosphite precipitates by controlling the temperature and the pH value. Next, the magnetic separation experiments were operated to collect the Ni-bearing precipitate which carried the weak magnetism. Although the performance of high temperature superconducting bulk magnet is superior to that of electromagnets, as a result, we succeeded in collecting Ni-sulfate crystals preferentially to the Ni-phosphite precipitates soon after the crystal growth began.

DOI： 10.2497/jjspm.61.S164

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Magnetic Flux-Trapping of Anisotropic-Grown Y-Ba-Cu-O Bulk Superconductors during and after Pulsed-Field Magnetizing Processes

T. Oka, Y. Yamada, T. Horiuchi, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, M. Langer

11TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS2013), PTS 1-4 507 2014

Language：English Publisher：IOP PUBLISHING LTD

The magnetic flux penetration into the melt-textured Y-Ba-Cu-O high temperature superconducting bulk magnets were precisely evaluated during and after the pulsed field magnetization processes operated at 30 K. The bulk magnets were carefully fabricated by the cold seeding method with use of a single and a pair of seed crystals composed of the Nd-BaCu- O thin films. These seed crystals were put on the top surfaces of the precursors to let the large grains grow during the heat treatments. We observed the flux penetrations which occurred in the lower applied-field regions at around 3.1 T for the samples bearing the twin seeds than those of the single-seeded crystals at around 3.8 T. This means that the magnetic fluxes are capable of invading into the twin-seeded samples more easily than the single-seeds. It suggests that the anisotropic grain growths of parallel and normal to the rows of seed crystals affects the variations of J(c) values with different distributions of the pinning centers, results in the preferential paths for the invading magnetic fluxes.

DOI： 10.1088/1742-6596/507/1/012039

Web of Science

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Pulsed-field Invasion to HTS Bulk Magnets Grown from Two Seeds with Varied Seed-crystal Positions and Numbers

T. Oka, Y. Yamada, T. Horiuchi, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, M. Langer

Physics Procedia 58 74 - 77 2014

© 2014 The Authors. The flux-invasion behavior into the melt-processed Y-Ba-Cu-O bulk magnets were precisely measured and analyzed during and after their pulsed-field magnetization processes operated at 30.6 K. The materials were fabricated as the bulk monoliths grown by adopting two seed-crystals, or shifting the seed-crystal positions from the centre of the sample surface, which exhibited the magnetically single-domain distributions. Although the performances of the trapped flux density after activations showed no obvious differences, the flux started invading into the sample bearing two seeds obviously at lower fields than those of normally-grown isotropic crystal. Since the flux penetration behavior were thus clearly different between the samples with the structure grown from two seeds and uniformly grown samples with a seed crystal, it is suggested that the structure results in an effective magnetizing method with less heating than those of conventional samples, which results in the higher performance of field trapping in the bulk magnets than usual.

DOI： 10.1016/j.phpro.2014.09.021

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10MW超級高温超電導風力発電機の電気設計と電磁特性解析

福井聡, 伏木貫太, 小川純, 佐藤孝雄, 向山晋一, 松岡太郎, 天野俊昭, 古川真, 山崎裕文, 古瀬充穂, 淵野修一郎, 岡野眞

低温工学・超電導学会講演概要集 90th 2014

磁場侵入経路の導入を狙ったバルク超伝導体の合成

堀内拓磨, 山田幸正, 小川純, 福井聡, 岡徹雄, 横山和哉, LANGER Marco

低温工学・超電導学会講演概要集 88th 192 2013.12

種結晶の数と配置を考慮して異方的に成長させたYBCOバルク磁石のパルス着磁特性

岡徹雄, 山田幸正, 堀内琢磨, 小川純, 福井聡, 佐藤孝雄, 横山和哉, LANGER Marco

低温工学・超電導学会講演概要集 88th 191 2013.12

種結晶の位置変化による異方的な超伝導バルク磁石のパルス着磁特性

岡徹雄, 山田幸正, 堀内拓磨, 小川純, 福井聡, 佐藤孝雄, 横山和哉

電気学会電力・エネルギー部門大会論文集(CD-ROM) 2013 ROMBUNNO.379 2013.8

大型風力用高温超電導同期発電機の電気設計の検討

伏木貫太, 前澤勝, 福井聡, 小川純, 岡徹雄, 佐藤孝雄

電気学会電力・エネルギー部門大会論文集(CD-ROM) 2013 ROMBUNNO.P50 2013.8

挿入された鉄心形状による高温超伝導線材の交流損失特性への影響

伏見侑, 前川達也, 小川純, 福井聡, 岡徹雄, 佐藤孝雄

電気学会電力・エネルギー部門大会論文集(CD-ROM) 2013 ROMBUNNO.P30 2013.8

パルス着磁に適したバルク超伝導体の合成

山田幸正, 堀内拓磨, 福井聡, 小川純, 佐藤孝雄, 横山和哉, LANGER Marco, 岡徹雄

低温工学・超電導学会講演概要集 87th 67 2013.5

Dy123系超伝導バルク磁石のパルス着磁における微細組織と温度特性

木伏貴映, 岡徹雄, 太田博之, 福井聡, 小川純, 横山和哉, 村上明

低温工学・超電導学会講演概要集 87th 30 2013.5

高温超伝導バルク磁石の反復着磁による磁場捕捉挙動と発熱現象

岡徹雄, 石塚大地, 木伏貴映, 太田博之, 小川純, 福井聡, 佐藤孝雄, 横山和哉, 村上明, STOPFEL Henry

低温工学・超電導学会講演概要集 87th 31 2013.5

超電導磁気分離による常磁性ニッケル塩の回収

岡徹雄, 深澤晴信, 吉沢直人, 高柳優也, 小川純, 福井聡, 佐藤孝雄, 大泉学, 辻村盛夫, 横山和哉

電気学会全国大会講演論文集 2013 ( 6 ) 6.S7(8)-6.S7(10) 2013.3

ツイスト型高温超電導線材の適用による多層同軸型スパイラルケーブルの交流損失低減効果

大塚良介, 福井聡, 小川純, 岡徹雄, 佐藤孝雄, 大屋正義, 増田孝人

電気学会全国大会講演論文集 2013 ( 5 ) 261 - 262 2013.3

高温超伝導バルク磁石を用いた埋込構造永久磁石同期機の永久磁石の着磁

上原翔, 川崎信隆, 福井聡, 小川純, 佐藤孝雄, 岡徹雄, 横山和哉

電気学会全国大会講演論文集 2013 ( 5 ) 289 2013.3

大型風力用高温超電導同期発電機の電気設計

前澤勝, 福井聡, 小川純, 岡徹雄, 佐藤孝雄

電気学会全国大会講演論文集 2013 ( 5 ) 285 2013.3

傾斜巻線部の導入による高温超伝導コイルの交流損失低減効果

石井寛明, 塚本翔午, 中村航, 松田旺, 福井聡, 小川純, 佐藤孝雄, 塚本修巳

低温工学・超電導学会講演概要集 88th 2013

挿入された鉄心形状による高温超伝導線材の交流損失特性への影響

前川達也, 伏見侑, 小川純, 福井聡, 岡徹雄, 佐藤孝雄

低温工学・超電導学会講演概要集 86th 77 2012.11

Experiment and Numerical Analysis of a Magnetizing Technique for Permanent Magnets of IPM Motors using HTS Bulk Magnets

KAWASAKI Nobutaka, UEHARA Shou, FUKUI Satoshi, OGAWA Jun, SATO Takao, TERASAWA Toshihisa, YOKOYAMA Kazuya, OKA Tetsuo

TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 47 ( 9 ) 568 - 575 2012.9

Language：Japanese Publisher：CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

Intense magnetic fields exceeding 2 T are necessary to magnetize rare-earth magnets to extract the full performance of magnet materials. In this report, we deal with the experimental measurements and numerical analysis of the magnetic flux after scans of the 3 T HTS bulk magnet on the surface of the rare-earth magnet. The distributions of the magnetic flux density between measured and simulated data on the magnet slab showed good agreement after the scanning. The study is conducted to evaluate the magnetization performances of bulk magnets for the interior permanent magnet (IPM) motors. According to the numerical analysis, the magnetic field of 3 T reached the point of 22 mm from the surface of the rotor. The experimental data clarified that the magnet slab (26 × 20 × 5 mm<sup>3</sup>) in the rotor was fully magnetized by scanning the bulk magnet on it, while the neighboring magnet was barely magnetized in the rotor because of its anisotropic magnetizing property. This shows that the magnets in IPM motors are capable of being activated from outside the rotors with use of HTS bulk magnets, which suggests an improved degree of freedom in designing the motor.

DOI： 10.2221/jcsj.47.568

Evaluation of AC Loss Characteristics in HTS Coil by Numerical Analysis and Measurements Using Power Meter and Boil-off Methods

FUKUI Satoshi, SHIBAYAMA Makoto, OGAWA Jun, SATO Takao

2012 ( 1 ) 77 - 81 2012.6

超伝導バルク磁石を使った無電解ニッケルめっき廃液からのニッケルの回収

深澤晴信, 岡徹雄, 三村大樹, 福井聡, 小川純, 佐藤孝雄, 大泉学, 横山和哉, 辻村盛夫, 寺澤俊久

電気学会全国大会講演論文集 2012 ( 5 ) 159 2012.3

高温超伝導バルク磁石の静磁場を用いた希土類永久磁石への着磁実験及び数値解析

川崎信隆, 上原翔, 福井聡, 小川純, 佐藤孝雄, 岡徹雄, 寺沢俊久, 伊藤佳孝, 横山和哉

電気学会全国大会講演論文集 2012 ( 5 ) 156 2012.3

Magnetic Separation of Nickel from Electroless Plating Waste Fluid using a HTS Bulk Magnet

OKA Tetsuo, KIMURA Takafumi, MIMURA Daiki, FUKAZAWA Harunobu, FUKUI Satoshi, OGAWA Jun, SATO Takao, OOIZUMI Manabu, TERASAWA Toshihisa, TSUJIMURA Morio, YOKOYAMA Kazuya

TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 46 ( 11 ) 655 - 660 2011.11

Language：Japanese Publisher：CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

A magnetic separation experiment to recycle nickel from the waste fluid of electroless plating processes was conducted using the open-gradient magnetic separation technique and a HTS bulk magnet system. A magnetic pole containing Gd123-based bulk superconductors was activated to 3.44 T at 34.9 K using a 5 T superconducting solenoid and the field cooling method. The coarse precipitates of nickel sulfate are composed of phosphite ions, which are yielded during the plating reaction by controlling the temperature and pH. Next, the open-gradient magnetic separation technique was employed, with use of water channels to separate the nickel-sulfate crystals from the mixture of the nickel sulfate and phosphite compounds based on the difference in magnetic properties. From the concentrations of each precipitate attracted to the magnetic pole, we succeeded in collecting nickel-sulfate crystals preferentially to the phosphite ions soon after crystal growth began.

DOI： 10.2221/jcsj.46.655

Dy123系超伝導バルク磁石のパルス着磁における磁場侵入挙動

石塚大地, 大塚智文, 小川純, 福井聡, 佐藤孝雄, 岡徹雄, 横山和哉, 村上明

低温工学・超電導学会講演概要集 85th 189 2011.11

22nd International Conference on Magnet Technology [MT-22]

野村新一, 高橋良和, 辺見努, 濱田一弥, 今川信作, 荻津透, 小黒英俊, 柁川一弘, 植田浩史, 中村武恒, 富田優, 三島史人, 岡徹雄, 小川純, 竹内孝夫, 東川甲平

Journal of the Cryogenics and Superconductivity Society of Japan 46 ( 10 ) 592 - 601 2011.10

高温超電導バルク磁石を用いた希土類磁石への着磁に関する数値解析

川崎信隆, 小川純, 福井聡, 佐藤孝雄, 岡徹雄, 伊藤佳孝, 寺沢俊久

低温工学・超電導学会講演概要集 84th 28 2011.5

スターリング冷凍機の高効率化に関する研究

大塚智文, 小林亮介, 小川純, 福井聡, 佐藤孝雄, 三ツ橋翔, 岡徹雄

低温工学・超電導学会講演概要集 84th 169 2011.5

Dy系高温超伝導バルク磁石のパルス着磁特性と捕捉磁場性能

岡徹雄, 関啓孝, 石塚大地, 小川純, 福井聡, 佐藤孝雄, 横山和哉, 村上明

低温工学・超電導学会講演概要集 84th 116 2011.5

Magnetizing of Permanent Magnet Using HTS Bulk Magnet

OKA Tetsuo, MURAYA Tomoki, KAWASAKI Nobutaka, FUKUI Satoshi, OGAWA Jun, SATO Takao, TERASAWA Toshihisa

TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 46 ( 3 ) 111 - 117 2011.3

Language：Japanese Publisher：CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

A demagnetized Nd-Fe-B permanent magnet was scanned just above the magnetic pole containing the HTS bulk magnet, generating a magnetic field of 3.27 T. The magnet sample was subsequently found to be fully magnetized in the open space of the static magnetic fields. We examined the magnetic field distributions when the magnetic poles were scanned twice to activate the magnetic plates inversely with various overlap distances between the tracks of the HTS bulk magnet. The magnetic field of the "rewritten" magnet reached the values of the magnetically saturated region of the material, showing steep gradients at the border of each magnetic pole. As a replacement for conventional pulse field magnetizing methods, this technique is proposed to expand the degree of freedom in the design of electromagnetic devices, and is proposed as a novel practical method for magnetizing rare-earth magnets, which have excellent magnetic performance and require intense fields of more than 3 T to be activated.

DOI： 10.2221/jcsj.46.111

超伝導バルク磁石を使ったメッキ廃液からのNi沈殿の磁気分離

岡徹雄, 木村貴史, 三村大樹, 福井聡, 小川純, 佐藤孝雄, 大泉学, 小野恭史, 横山和哉, 辻村盛夫, 寺澤俊久

電気学会全国大会講演論文集 2011 ( 2 ) 189 2011.3

Measurement and Numerical Analysis of AC Loss Characteristics of Polygonal Conductor Assembled by YBCO Tapes

FUKUI Satoshi, NANAYAMA Junichi, MARUKO Atsushi, OGAWA Jun, SATO Takao, TSUKAMOTO Osami, TAKAO Tomoaki

2011 ( 1 ) 23 - 27 2011.1

船舶推進用高温超伝導同期モータの界磁巻線の最適化設計の検討

河井利宏, 福井聡, 高橋政樹, 小川純, 佐藤孝雄, 塚本修巳

低温工学・超電導学会講演概要集 84th 2011

大規模風力用高温超伝導同期発電機の電磁設計の検討

長谷川誠, 福井聡, 小川純, 佐藤孝雄, 塚本修巳, 鹿島直二, 長屋重夫

低温工学・超電導学会講演概要集 84th 2011

二層多角形配置YBCO集合導体の外層と内層の電流バランスによる交流損失特性への影響

春日瑛祐, 田村昭洋, 小川純, 福井聡, 岡徹夫, 佐藤孝雄

低温工学・超電導学会講演概要集 84th 2011

高温超伝導バルク磁極装置に発生する静磁場を用いた永久磁石の着磁技術

川崎信隆, 村谷知樹, 小川純, 福井聡, 佐藤孝雄, 岡徹雄, 伊藤佳孝, 寺沢俊久

低温工学・超電導学会講演概要集 83rd 163 2010.12

鉄心中における高温超伝導線材の交流損失特性

二口達壮, 前川達也, 小川純, 福井聡, 岡徹雄, 佐藤孝雄, 中村武恒, 長村光造

低温工学・超電導学会講演概要集 83rd 123 2010.12

交流通電・交流磁界の電磁条件における直流通電バイアスが高温超伝導の損失特性に及ぼす影響

小島裕史, 柴山誠, 江川暢康, 小川純, 福井聡, 岡徹雄, 佐藤孝雄

低温工学・超電導学会講演概要集 83rd 124 2010.12

Study of Electro-magnetic Design of Large Scale Wind Turbine Synchronous Generators with HTS Field Windings

FUKUI Satoshi, OGAWA Jun, SATO Takao, TSUKAMOTO Osami, KASHIMA Naoji, NAGAYA Shigeo

2010 ( 17 ) 63 - 67 2010.6

高温超伝導バルク磁極装置に発生する静磁場を用いた永久磁石の着磁技術

川崎信隆, 村谷知樹, 今井順, 小川純, 福井聡, 佐藤孝雄, 岡徹雄, 伊藤佳孝, 寺沢俊久

低温工学・超電導学会講演概要集 82nd 138 2010.5

高勾配磁気分離における磁気フィルターへの磁性微粒子の吸着現象のモンテカルロシミュレーション

菊地孝治, 八柳智也, 福井聡, 小川純, 岡徹雄, 佐藤孝雄, 今泉洋

低温工学・超電導学会講演概要集 82nd 94 2010.5

超伝導磁気浮上を適用したフォトマスク洗浄プロセス用非接触スピン装置の研究開発

福井聡, 風間亨介, 小川純, 岡徹雄, 佐藤孝雄, 反町聡, 斉藤君世, 宮崎紳介

低温工学・超電導学会講演概要集 82nd 168 2010.5

5つの並列配置した高温超伝導バルク磁石のパルス着磁と磁気分離への適用

岡徹雄, 山崎英誠, 関啓孝, 田中克昌, 木村貴史, 三村大樹, 小川純, 福井聡, 佐藤孝雄, 藤代博之, 林秀美, 横山和哉, STIEHLER C

低温工学・超電導学会講演概要集 82nd 36 2010.5

高温超伝導バルク磁石のパルス着磁と捕捉磁場性能

関啓孝, 山崎英誠, 小川純, 福井聡, 佐藤孝雄, 岡徹雄

電気学会全国大会講演論文集 2010 ( 5 ) 138 2010.3

対向型電磁石を使った地下水からの除鉄プロセスの検討

岡徹雄, 田中克昌, 木村貴史, 三村大樹, 福井聡, 小川純, 佐藤孝雄, 大泉学, 横山和哉, 山口貢

電気学会全国大会講演論文集 2010 ( 5 ) 140 2010.3

道を進む超伝導自動車

中村武恒, 西村敏治, 松村一弘, 松尾哲司, 奥村暢朗, 大橋義正, 伊藤佳孝, 吉川雅章, 寺澤俊久, 長村光造, 福井聡, 小川純, 岡徹雄

応用物理学関係連合講演会講演予稿集(CD-ROM) 57th ROMBUNNO.17P-ZM-4 2010.3

Measurement and evaluation of AC loss characteristics of polygonal YBCO assembled conductor

OGAWA J., FUKUI S., OKA T., SATO T., MARUKO A., ITO T., SUGISAWA J., TAMURA A.

電気学会超電導応用電力機器研究会資料 2010 ( 1 ) 63 - 66 2010.1

パワーメータを用いた高温超伝導コイルの交流損失測定法の検討

前野友哉, 柴山誠, 福井聡, 小川純, 佐藤孝雄, 塚本修巳

低温工学・超電導学会講演概要集 83rd 2010

Magnetizing of Permanent Magnet using HTS Bulk Magnet

IMAI Jun, MURAYA Tomoki, HIGUTI Masanori, KAWASAKI Nobutaka, HUKUI Satoshi, OGAWA Jun, SATO Takao, OKA Tetsuo, ITO Yositaka, TERASAWA Toshihisa, YABUNO Ryohei

低温工学・超電導学会講演概要集 81 136 - 136 2009.11

AC Loss Characteristics of Multi-layer Conductor Assembled by HTS Coated Tape Wire

FUKUI Satoshi, SUZUKI Nobuya, OGAWA Jun, MARUKO Atsushi, OKA Tetsuo, SATO Takao, TSUKAMOTO Osami

低温工学・超電導学会講演概要集 81 27 - 27 2009.11

Monte Carlo Simulation of accumulation of Magnetic Fine Particles around Magnetized Fine Wire

YATSUYANAGI Tomoya, FUKUI Satoshi, OGAWA Jun, OKA Tetsuo, SATO Takao, IMAIZUMI Hiroshi

低温工学・超電導学会講演概要集 81 188 - 188 2009.11

Relation between AC loss and Geometrical Parameters of Multi-layer Spiral Conductor Assembled by HTS Coated Tape Wire

SUZUKI Nobuya, FUKUI Satoshi, OGAWA Jun, OKA Tetsuo, SATO Takao

低温工学・超電導学会講演概要集 81 174 - 174 2009.11

Measurement and evaluation of AC loss characteristics of hexagonal YBCO assembled conductor

SUGISAWA Junki, MARUKO Atsushi, ITO Takahiro, OGAWA Jun, FUKUI Satoshi, OKA Tetsuo, SATO Takao

低温工学・超電導学会講演概要集 81 173 - 173 2009.11

Collecting Nickel Element from Waste Solution of Plating Process by Magnetic Separation with Superconducting Bulk Magnet

TANAKA Katsuyoshi, KIMURA Takafumi, MIMURA Daiki, FUKUI Satoshi, OGAWA Jun, SATO Takao, OIZUMI Manabu, OKA Tetsuo, TERASAWA Toshihisa, TSUJIMURA Morio

低温工学・超電導学会講演概要集 81 198 - 198 2009.11

Study on AC transport current loss measurement in assembled conductor using a four terminal method

ITO Takahiro, SHINKAI Kazuya, OGAWA Jun, FUKUI Satoshi, OKA Tetsuo, SATO Takao

低温工学・超電導学会講演概要集 81 175 - 175 2009.11

Study of Large Scale Wind Turbine Synchronous Generators with HTS Field Windings

FUKUI Satoshi, ARAKAWA Kento, OGAWA Jun, SATO Takao, TSUKAMOTO Osami, KASHIMA Naoji, NAGAYA Shigeo

81 182 - 182 2009.11

Study on AC transport current loss measurement in assembled conductor using a four terminal method

OGAWA J., FUKUI S., OKA T., SATO T., SHINKAI K., ITO T.

電気学会超電導応用電力機器研究会資料 2009 ( 20 ) 5 - 9 2009.6

Study of pulsed field magnetization for high temperature superconducting bulk magnet and trapped field performance

YAMAZAKI Hidetaka, SEKI Hirotaka, HIROSE Yutaka, OGAWA Jun, FUKUI Satoshi, SATO Takao, OKA Tetsuo

低温工学・超電導学会講演概要集 80 19 - 19 2009.5

Relation between AC Loss and Geometrical Parameters of Multi-layer Polygonal Conductor Assembled by HTS Coated Tape Wire

SUZUKI Nobuya, FUKUI Satoshi, OGAWA Jun, OKA Tetsuo, SATO Takao, TSUKAMOTO Osami, TAKAO Tomoaki

低温工学・超電導学会講演概要集 80 97 - 97 2009.5

Effect of AC Loss Reduction of HTS Multi-pole Coil by Optimal Structure Design of Winding Cross-section of Element Coils

TAKAHASHI Masaki, MIWA Yoshihiro, FUKUI Satoshi, OGAWA Jun, OKA Tetsuo, SATO Takao

低温工学・超電導学会講演概要集 80 103 - 103 2009.5

Magnetizing of Permanent Magnet Using HTS Bulk Magnet and the Magnetic Field Distribution Measurement

KAWASAKI Nobutaka, MURAYA Tomoki, IMAI Jun, HIROSE Yutaka, OGAWA Jun, FUKUI Satoshi, SATO Takano, OKA Tetsuo, ITO Yoshitaka, TERASAWA Tosihisa

低温工学・超電導学会講演概要集 80 44 - 44 2009.5

Magnetic Separation by Superconducting Bulk Magnet for Waste Solution from Nickel Plating Process

KIMURA Takafumi, KANAYAMA Hayato, TANAKA Katsuyoshi, WATANABE Naoto, FUKUI Satoshi, OGAWA Jun, SATOH Takao, OKA Tetsuo, TERASAWA Toshihisa, TSUJIMURA Morio

低温工学・超電導学会講演概要集 80 204 - 204 2009.5

Research and Development of Non-contact Spin Processor Applying Superconducting Magnetic Levitation Reviewed

KAZAMA Ryosuke, SEKIYA Shota, FUKUI Satoshi, OGAWA Jun, OKA Tetsuo, SATO Takao, SAITO Kimiyo, MIYAZAKI Shinsuke

低温工学・超電導学会講演概要集 80 175 - 175 2009.5

バルク超伝導体によるコンパクトな捕捉磁場マグネットとその応用

岡徹雄, 福井聡, 小川純, 佐藤孝雄, 山口貢

応用物理学関係連合講演会講演予稿集 56th ( 0 ) 91 2009.3

高温超伝導バルク磁石を用いた永久磁石の同面異極着磁とその磁場分布

川崎信隆, 村谷知樹, 今井順, 広瀬豊, 小川純, 福井聡, 佐藤孝雄, 岡徹雄, 伊藤佳孝, 寺沢俊久

電気学会全国大会講演論文集 2009 ( 5 ) 220 2009.3

超伝導バルク磁石を使った地下水の浄化プロセスへの応用

岡徹雄, 金山隼人, 田中克昌, 渡邊直登, 木村貴史, 福井聡, 小川純, 佐藤孝雄, 大泉学, 横山和哉, 山口貢

電気学会全国大会講演論文集 2009 ( 5 ) 219 2009.3

Numerical Study on Active Stabilization of Vibration for Non-contact Spin Processor Applying Superconducting Magnetic Levitation

SATO Sho, FUKUI Satoshi, OGAWA Jun, OKA Tetsuo, SATO Takao, SAITO Kimiyo

電気学会超電導応用電力機器研究会資料 2009 ( 9 ) 53 - 57 2009.2

Relation between AC Loss and Geometrical Parameters of Multi-layer Polygonal Conductor Assembled by HTS Coated Tape Wire

SUZUKI Nobuya, FUKUI Satoshi, OGAWA Jun, OKA Tetsuo, SATO Takao, TSUKAMOTO Osami, TAKAO Tomoaki, YAMAGUCHI Mitsugi

電気学会超電導応用電力機器研究会資料 2009 ( 1 ) 1 - 5 2009.2

Dependence of repeated tensile stresses on AC losses in multi-filamentary Bi2223/Ag-sheathed wires

NAKAJIMA Yu, MARUYAMA Satoshi, MITSUI Satoshi, UNO Taiga, TAKAO Tomoaki, LI Zhaofeng, TSUKAMOTO Osami, OGAWA Jun, MIMURA Tomoo

2009 ( 1 ) 7 - 11 2009.2

Study on magnetic separation system using high Tc superconducting bulk magnets for water purification technique

T. Oka, H. Kanayama, K. Tanaka, S. Fukui, J. Ogawa, T. Sato, M. Yamaguchi, M. Ooizumi, K. Yokoyama, K. Noto

Journal of Physics: Conference Series 156 2009

The application of superconducting bulk magnets to the magnetic separation techniques has been investigated for the Mn-bearing waste water drained from the university laboratories. The research has been conducted in comparison with the electromagnets, and the cryo-cooled superconducting solenoid magnet. The separation ratios of ferrite precipitates including Mn element in the waste slurry were estimated by means of the high gradient magnetic separation method with ferromagnetic iron filters in the water channel and open gradient magnetic separation without them. As the magnetic force acting on the particles is given by the product of a magnetization of particles and a gradient of magnetic field, and a superconducting bulk magnet shows a sharp gradient of the magnetic field on the surface, the performances of the bulk magnet system were almost equivalent to those of the superconducting solenoid magnet with wide bore with respect to the magnetic separation ratios. The separation ratios for Mn have reached over 80 % for HGMS and 10 % for OGMS under the flow rates less than 3 liter/min. © 2009 IOP Publishing Ltd.

DOI： 10.1088/1742-6596/156/1/012031

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Influence of the transport current direction on AC transport current losses in assembled HTS conductor

OGAWA J., FUKUI S., OKA T., SATO T., TAKAHASHI K., YASHIRO T., SHINKAI K., KUME S.

電気学会超電導応用電力機器研究会資料 2008 ( 19 ) 25 - 29 2008.6

Influence of transport current direction on HTS assembled conductor

TAKAHASHI Kentaro, YASHIRO Tamotsu, SHINKAI Kazuya, KUME Sota, OGAWA Jun, FUKUI Satoshi, OKA Tetsuo, SATO Takao

低温工学・超電導学会講演概要集 78 160 - 160 2008.5

Magnetic Separation Experiment for Waste Water of Cutting Oil by Superconducting Bulk Magnet

TANAKA Katsuyoshi, KANAYAMA Hayato, KOBAYASHI Ryou, FUKUI Satoshi, OGAWA Jun, OIZUMI Manabu, OKA Tetsuo, YAMAGUCHI Mitsugi, TERASAWA Toshihisa

低温工学・超電導学会講演概要集 78 97 - 97 2008.5

AC transport current loss measure in HTS tape with local damage using a pickup loop method

MARUKO Atsushi, TANAKA Hiroshi, HAMADA Takako, OGAWA Jun, FUKUI Satoshi, OKA Tetsuo, SATO Takao

低温工学・超電導学会講演概要集 78 158 - 158 2008.5

Collecting Nickel Element from Waste Solution of Plating Process by Magnetic Separation with Bulk Magnet

KANAYAMA Hayato, TANAKA Katsuyoshi, KOBAYASHI Ryo, FUKUI Satoshi, OGAWA Jun, OHIZUMI Manabu, OKA Tetsuo, YAMAGUCHI Mitsugi, TERASAWA Toshihisa, TSUJIMURA Morio

低温工学・超電導学会講演概要集 78 96 - 96 2008.5

Magnetizing a Permanent Magnet using HTS Bulk Magnet

IMAI Jun, HIROSE Yutaka, INOMATA Tadashi, OGAWA Jun, HUKUI Satoshi, SATO Takao, OKA Tetsuo, YAMAGUCHI Mitsugi

低温工学・超電導学会講演概要集 78 128 - 128 2008.5

対向配置した超伝導バルク磁石の製作とその磁場分布

岡徹雄, 猪股正, 今井順, 山崎英誠, 広瀬豊, 小川純, 福井聡, 佐藤孝雄, 山口貢

電気学会全国大会講演論文集 2008 ( 5 ) 178 2008.3

磁石装置の発展と医療技術への展開

福井聡, 山口貢, 岡徹雄, 小川純

電気学会全国大会講演論文集 2008 ( 5 ) 5.S10(11)-5.S10(14) 2008.3

Design method of AC transport current loss measurements using a pick-up loop for different HTS cross-section

OGAWA J., FUKUI S., OKA T., SATO T., HAMADA T., TANAKA H., MARUKO A.

電気学会超電導応用電力機器研究会資料 2008 ( 9 ) 49 - 53 2008.1

Study on Design of Co-axial Multi-layer HTS Cable with HTS Magnetic Shield Conductor Based on AC Loss Minimization

FUKUI Satoshi, MIKURA Yuki, OGAWA Jun, OKA Tetsuo, SATO Takao, YAMAGUCHI Mitsugi, TSUKAMOTO Osami

電気学会超電導応用電力機器研究会資料 2008 ( 9 ) 37 - 41 2008.1

Study on performance improvements of a high temperature superconducting coil with a lattice-shape cross section

ISHIGURI Shinichi, OKA Tetsuo, FUKUI Satoshi, OGAWA Jun, SATO Takao

低温工学・超電導学会講演概要集 77 84 - 84 2007.11

Study on Optimal Design of HTS Coil Based on AC Loss Minimization

OOSUGI Kei, FUKUI Satoshi, OGAWA Jun, OKA Tetsuo, SATO Takao, YAMAGUCHI Mitsugi, TSUKAMOTO Osami, FURUSE Mitsuho

低温工学・超電導学会講演概要集 77 85 - 85 2007.11

Numerical analysis of AC transport current loss measurements using a pick-up loop

HAMADA Takako, TANAKA Hiroshi, MARUKO Atsushi, OGAWA Jun, FUKUI Satoshi, SATO Takao, OKA Tetsuo

Abstracts of CSJ Conference, 2007 77 215 - 215 2007.11

Measurement of AC transport current loss in 2 layer HTS spiral cable

SATO Sho, YAMADA Keisuke, MIKURA Yuki, HASEBE Yoshikazu, NISHIGORI Masaru, OGAWA Jun, FUKUI Satoshi, OKA Tetsuo, SATO Takao, TSUKAMOTO Osami, SATO Kenichi, KATO Takeshi

低温工学・超電導学会講演概要集 77 147 - 147 2007.11

AC transport current loss characteristics of HTS assembled conductor for arrangement and direction of transport current

SHINKAI Kazuya, KUME Sota, TAKAHASHI Kentaro, YASHIRO Tamotsu, OGAWA Jun, FUKUI Satoshi, OKA Tetsuo, SATO Takao

Abstracts of CSJ Conference, 2007 77 216 - 216 2007.11

Waste Water Purification by Magnetic Separation Experiments Using HTS Bulk Magnets

OKA Tetsuo, KANAYANA Hayato, HIROSE Yutaka, KIKUCHI Hokuto, KOBAYASHI Ryo, TANAKA Katsuyoshi, OGAWA Jun, FUKUI Satoshi, SATO Takao, YAMAGUCHI Mitsugi, OOIZUMI Manabu, TERASAWA Toshihisa, ITOH Yoshitaka

低温工学・超電導学会講演概要集 77 178 - 178 2007.11

Development of Magnetic Levitated Spin Coater Using HTS Bulk (4) : Investigation of Permanent Magnet Array to Gain Levitation Force and Height

FUKUI Satoshi, OGAWA Jun, OKA Tetsuo, SATO Takao, YAMAGUCHI Mitsugi, MIYAZAKI Shinsuke, NISHIWAKI Shunro

低温工学・超電導学会講演概要集 77 179 - 179 2007.11

Performances of HTS Bulk Magnets Using Compact Refrigerators and Their Applications

OKA Tetsuo, HIROSE Yutaka, KANAYAMA Hayato, KIKUCHI Hokuto, OGAWA Jun, FUKUI Satoshi, SATO Takao, YAMAGUCHI Mitsugi, OOIZUMI Manabu

電気学会超電導応用電力機器研究会資料 2007 ( 35 ) 1 - 4 2007.5

Flow Fractionation Characteristics of Open Gradient Magnetic Chromatography Using HTS Bulk Magnet

SHOJI Yoshihiro, OGAWA Jun, FUKUI Satoshi, OKA Tetsuo, YAMAGUCHI Mitsugi, SATO Takao, IMAIZUMI Hiroshi, OHARA Takeshi

電気学会超電導応用電力機器研究会資料 2007 ( 35 ) 13 - 16 2007.5

Study on Optimization Design of Cross Section of HTS Coil Based on AC Loss Minimization

OOSUGI Kei, OGAWA Jun, FUKUI Satoshi, OKA Tetsuo, YAMAGUCHI Mitsugi, SATO Takao, TSUKAMOTO Osami, TAKAO Tomoaki

電気学会超電導応用電力機器研究会資料 2007 ( 35 ) 27 - 30 2007.5

AC transport current loss characteristics of HTS assembled conductors arranged edge-to-edge and face-to-face

KUME Sota, SHINKAI Kazuya, SATO Sho, OGAWA Jun, FUKUI Satoshi, SATO Takao, OKA Tetsuo, YAMAGUCHI Mitsugi

電気学会超電導応用電力機器研究会資料 2007 ( 35 ) 21 - 26 2007.5

Study on pick-up loop design for AC transport current loss measurement

TANAKA Hiroshi, HAMADA Takako, YAMAYA Kodai, OGAWA Jun, FUKUI Satoshi, SATO Takao, OKA Tetsuo, YAMAGUCHI Mitsugi

電気学会超電導応用電力機器研究会資料 2007 ( 35 ) 43 - 48 2007.5

Optimum Design of a HTS Coil Based on AC Loss Minimization

OOSUGI Kei, OGAWA Jun, FUKUI Satoshi, SATO Takao, OKA Tetsuo, FURUSE Mitsuho, TSUKAMOTO Osami

低温工学・超電導学会講演概要集 76 151 - 151 2007.5

AC transport current loss characteristics of polygonal arranged HTS assembled conductors

UNO Hiroshi, KATO Yuki, OGAWA Jun, FUKUI Satoshi, SATO Takao, OKA Tetsuo, YAMAGUCHI Mitsugi

低温工学・超電導学会講演概要集 76 76 - 76 2007.5

Comparison on Magnetic Separation Experiments for HTS Bulk Magnet and Other Field Generators

KANAYAMA Hayato, HIROSE Yutaka, KIKUCHI Hokuto, OGAWA Jun, FUKUI Satoshi, SATO Takao, YAMAGUCHI Mitsugi, OHIZUMI Manabu, OKA Tetsuo

低温工学・超電導学会講演概要集 76 5 - 5 2007.5

Performances of HTS bulk magnet system activated by FC mode with ST Pulse Tube Cooler

HIROSE Yutaka, KANAYAMA Hayato, KIKUCHI Hokuto, OGAWA Jun, HUKUI Satoshi, SATO Takao, YAMAGUCHI Mitsugi, OKA Tetsuo

低温工学・超電導学会講演概要集 76 183 - 183 2007.5

AC transport current loss characteristics of HTS assembled conductors arranged edge-to-edge and face-to-face

KUME Sota, SHINKAI Kazuya, OGAWA Jun, FUKUI Satoshi, SATO Takao, OKA Tetsuo, YAMAGUCHI Mitsugi

Abstracts of CSJ Conference, 2007 76 75 - 75 2007.5

Optimum design of a pick-up loop to measure AC transport current loss in HTS tape without an electrical connection

TANAKA Hiroshi, HAMADA Takako, YAMAYA Kodai, OGAWA Jun, FUKUI Satoshi, SATO Takao, OKA Tetsuo, YAMAGUCHI Mitsugi

低温工学・超電導学会講演概要集 76 77 - 77 2007.5

限流器による配電系統の電圧フリッカ対策

佐藤孝雄, 寺嶋亨, 粟野篤, 山口貢, 福井聡, 小川純, 岡徹雄, 清水洋隆, 佐藤智之

電気学会全国大会講演論文集 2007 ( 6 ) 386 2007.3

高温超伝導薄膜導体を平面配置した並列集合導体の交流損失測定法の数値実験

石井亮太, 小川純, 福井聡, 岡徹雄, 山口貢, 佐藤孝雄, 中村智史, 塚本修巳

低温工学・超電導学会講演概要集 75th 90 2006.11

小型パルス管冷凍機によるバルク磁石装置の製作

岡徹雄, 広瀬豊, 金山隼人, 菊地北斗, 小川純, 福井聡, 佐藤孝雄, 山口貢

低温工学・超電導学会講演概要集 75th 216 2006.11

非接触型測定法による高温超伝導線材の交流損失評価法の開発

山谷幸大, 濱田貴子, 小川純, 福井聡, 岡徹雄, 山口貢, 佐藤孝雄

低温工学・超電導学会講演概要集 75th 202 2006.11

高温超伝導テープ線材を用いた多層円形集合導体の交流通電損失の非接触測定法の数値実験

渡辺壮, 小川純, 福井聡, 岡徹雄, 山口貢, 佐藤孝雄, 塚本修巳

低温工学・超電導学会講演概要集 75th 201 2006.11

単層高温超伝導ケーブルの交流通電損失の非接触型測定法の開発

加藤祐樹, 宇野啓史, 小川純, 福井聡, 岡徹雄, 山口貢, 佐藤孝雄, 塚本修巳

低温工学・超電導学会講演概要集 75th 88 2006.11

高温超伝導テープ線材を用いた多層円形集合導体の交流通電損失特性

福井聡, 渡辺壮, 小川純, 岡徹雄, 山口貢, 佐藤孝雄, 塚本修巳

低温工学・超電導学会講演概要集 75th 200 2006.11

A study of the performance improvement of an HTS coil by the outer corner modification

ISHIGURI Shinichi, YAMAGUCHI Mitsugi, FUKUI Satoshi, OGAWA Jun, SATO Takao

75 191 - 191 2006.11

Study on Magnetic-Force-Assisted Drug Delivery System

FUKUI Satoshi, ABE Ryosuke, OGAWA Jun, OKA Tetsuo, YAMAGUCHI Mitsugi, SATO Takao

電気学会超電導応用電力機器研究会資料 2006 ( 39 ) 23 - 28 2006.9

Numerical Study on AC Transport Loss Measurement of HTS Assembled Conductor by Spiral Pick-up Loop without Electrical Contacts

WATANABE So, FUKUI Satoshi, OGAWA Jun, YAMAGUCHI Mitsugi, SATO Takao, TSUKAMOTO Osami

2006 ( 16 ) 41 - 44 2006.6

Feasibility Study on Open Gradient Magnetic Chromatography Using HTS Bulk Magnet

FUKUI S., ABE R., OGAWA J., YAMAGUCHI M., OKA T., SATO T., IMAIZUMI H., OHARA T.

低温工学・超電導学会講演概要集 74 192 - 192 2006.5

Numerical Study on AC Transport Loss Measurement of HTS Assembled Conductor by Pick-up Loop without Electrical Contacts

WATANABE S., FUKUI S., OGAWA J., YAMAGUCHI M., SATO T., OKA T., TSUKAMOTO O.

低温工学・超電導学会講演概要集 74 144 - 144 2006.5

Development of Magnetic Levitated Spin Coater Using HTS Bulk (3)

FUKUI S., OGAWA J., YAMAGUCHI M., OKA T., SATO T., SASAHARA T., NISHIWAKI S., YUKI Y.

低温工学・超電導学会講演概要集 74 223 - 223 2006.5

Study on Magnetic Force-assisted Drug Delivery System (3)

ABE R., FUKUI S., OGAWA J., YAMAGUCHI M., OKA T., SATO T., IMAIZUMI H.

低温工学・超電導学会講演概要集 74 191 - 191 2006.5

Numerical Analysis of Low AC Loss Structure of Multi-layer Tri-axial 3-Phase Cable

NOGUCHI T., FUKUI S., OGAWA J., YAMAGUCHI M., SATO T., OKA T., TAKAO T., TSUKAMOTO O.

低温工学・超電導学会講演概要集 74 152 - 152 2006.5

Stabilization of Load Voltage Fluctuation in Distribution System with Superconducting Fault Current Limiter

SATO Takao, TERASHIMA Tohru, YAMAGUCHI Mitsugi, FUKUI Satoshi, OGAWA Jun, SHIMIZU Hirotaka, SATO Tomoyuki

74 153 - 153 2006.5

AC loss characteristics of Bi2223/Ag sheathed tapes subjected to mechanical stresses

LI Zhaofeng, SUZUKI Hiroyuki, OSUDA Yuka, YAMAGISHI Kazuhito, TSUKAMOTO Osami, OGAWA Jun, CISZEK Marian

74 137 - 137 2006.5

Influence of high frequency AC magnetic field on trapped magnetic field in HTS bulk

OGAWA Jun, FUKUI Satoshi, YAMAGUCHI Mitsugi, SATO Takao, YAMASHIGE Susumu, SATO Ryuichi, KASAI Masatoshi, TAKADA Mamoru, TOMITA Masaru

74 175 - 175 2006.5

Comparison between the experimental and numerical analysis of AC transport current loss measurement in HTS tapes in an assembled conductor

OGAWA Jun, FUKUI Satoshi, YAMAGUCHI Mitsugi, SATO Takao, TSUKAMOTO Osami, NAKAMURA Satoshi

2006 ( 1 ) 17 - 20 2006.1

Performance evaluation of high temperature superconducting toroidal field coil

MARUYAMA Ryo, ISHIGURI Shinichi, YAMAGUCHI Mitsugi, FUKUI Satoshi, OGAWA Jun, SATO Takao

2006 ( 1 ) 33 - 37 2006.1

Effect of Superconducting Fault Current Limiter in Distribution System with Dispersed Generators

SATO Takao, TERASHIMA Tohru, SATO Takumi, YAMAGUCHI Mitsugi, FUKUI Satoshi, OGAWA Jun, SHIMIZU Hirotaka, SATO Tomoyuki

2006 ( 1 ) 57 - 61 2006.1

AC loss characteristics of HTS tape under tensile strain

LI Zhaofeng, SUZUKI Hiroyuki, OSUDA Yuuka, YAMAGISHI Kazuhito, TSUKAMOTO Osami, OGAWA Jun, MARIAN Ciszek

2006 ( 1 ) 11 - 16 2006.1

Study on Protection of Instantaneous Voltage Sag by Fault Current Limiter in Power System

TERASHIMA Tohru, SATO Takumi, SATO Takao, YAMAGUCHI Mitsugi, FUKUI Satoshi, OGAWA Jun, SHIMIZU Hirotaka, SATO Tomoyuki

73 105 - 105 2005.11

Development of Magnetic Levitated Spin Coater Using HTS Bulk (1) : R & D Plan

FUKUI S., OGAWA J., YAMAGUCHI M., SATO T., SASAHARA T., NISHIWAKI S., YUKI Y.

73 252 - 252 2005.11

Magnetization loss in a striated YBCO coated conductor considering the intrinsic critical current distribution

OGAWA Jun, FUKUI Satoshi, YAMAGUCHI Mitsugi, SATO Takao, TSUKAMOTO Osami

73 237 - 237 2005.11

Dependence of AC Loss with a Phase Difference between Transport Current and Applied Magnetic Field

OGAWA Jun, FUKUI Satoshi, YAMAGUCHI Mitsugi, SATO Takao, KOBAYASHI Yoichi, YAMAYA Kodai, TAKATSUKA Ryo

73 196 - 196 2005.11

Study on Magnetic Force-assisted DDS (2) : Numerical Simulation of Concentration Control of Magnetic Particles

TAKAHASHI Yohei, FUKUI Satoshi, OGAWA Jun, YAMAGUCHI Mitsugi, SATO Takao, IMAIZUMI Hiroshi

73 111 - 111 2005.11

Development of Magnetic Levitated Spin Coater Using HTS Bulk (2) : Present Status

YAMASHIGE S., KASAI M., SATO R., TAKADA M., OGAWA J., FUKUI S., YAMAGUCHI M., SATO T., SASAHARA T., NISHIWAKI S., YUKI Y.

73 112 - 112 2005.11

Numerical Analysis of Transport Loss Characteristics of Bi/Ag Parallel Conductor

OKAMURA T., KOBAYASHI T., FUKUI S., OGAWA J., YAMAGUCHI M., SATO T., TSUKAMOTO O.

73 199 - 199 2005.11

Total AC loss characteristics of HTS tape conductors subjected to tensile stresses

SUZUKI Hiroyuki, LI Zhaofeng, OSUDA Yuka, YAMAGISHI Kazuhito, TSUKAMOTO Osami, OGAWA Jun, CISZEK Marian

73 200 - 200 2005.11

Magnetic Chromatography Using Quadrupole Magnetic Field : Applicability to Separation of Paramagnetic Ultra-fine Particle

TAKAHASHI M., FUKUI S., OGAWA J., YAMAGUCHI M., SATO T., IMAIZUMI H., OHARA T.

73 107 - 107 2005.11

Introduction of Fault Current Limiter in Power System with Dispersed Generators

SATO Takao, TERASHIMA Tohru, SATO Takumi, YAMAGUCHI Mitsugi, FUKUI Satoshi, OGAWA Jun, SHIMIZU Hirotaka, SATO Tomoyuki

73 104 - 104 2005.11

Study on Magnetic Force-assisted DDS (1) : Numerical Simulation of Transport Properties of Magnetic Particles in Narrow Channel

ABE Ryosuke, FUKUI Satoshi, OGAWA Jyun, YAMAGUCHI Mitugu, SATO Takao, IMAIZUMI Hiroshi

73 110 - 110 2005.11

Examination of high temperature superconducting toroidal coil

MARUYAMA Ryo, ISHIGURI Shinichi, YAMAGUCHI Mitsugi, FUKUI Satoshi, OGAWA Jun, SATO Takao, WATANABE Minoru

73 113 - 113 2005.11

Study on the Optimal Design of a High Temperature Superconducting Coil

ISHIGURI Shinichi, YAMAGUCHI MItugi, FUKUI Satoshi, OGAWA Jun, SATO Takao

73 121 - 121 2005.11

Characteristics of Current Distribution and AC Loss in Tri-axial Multi-layer 3-phase HTS Cable

NOGUCHI Takeshi, FUKUI Satoshi, OGAWA Jun, SATO Takao, YAMAGUCHI Mitsugi, TSUKAMOTO Osami, TAKAO Tomoaki

2005 ( 22 ) 25 - 29 2005.6

Method of Calorimetric Measurement of AC Losses in HTS Bulk

SEKIZAWA Shinichiro, ASABA Isao, YAMAGISHI Kazuhito, TSUKAMOTO Osami, OGAWA Jun, TOMITA Masaru

2005 ( 22 ) 53 - 57 2005.6

AC loss characteristics of a subdivided superconducting strip due to critical current density distribution

OGAWA Jun, FUKUI Satoshi, YAMAGUCHI Mitsugi, SATO Takao, KOJIMA Ryuichi, TSUKAMOTO Osami, CISZEK Marian, SEKINE Naoki, SUZUKI Hiroyuki

2005 ( 22 ) 31 - 35 2005.6

Application of Fault Current Limiter in Power System with Introducing Distributed Generators

SATO Takao, YAMAGUCHI Mitsugi, FUKUI Satoshi, OGAWA Jun, SATO Tomoyuki

72 276 - 276 2005.5

Method of Calorimetric Measurement of AC Losses in HTS Bulk

YAMAGISHI Kazuhito, ASABA Isao, SEKIZAWA Shinichiro, TSUKAMOTO Osami, OGAWA Jun, TOMITA Masaru

72 167 - 167 2005.5

Analysis of AC Loss in HTS Coils with Various Cross Sections

ABE S., NISHIJYO T., FUKUI S., OGAWA J., YAMAGUCHI M., SATO T., FURUSE M., ARAI K., UMEDA M.

72 172 - 172 2005.5

Continuous Magnetic Separation Using Conduction Cooling Superconducting Magnet

TAKAHASHI Y., FUKUI S., YONEKAWA Y., TAKAHASHI M., YAMAGUCHI M., OGAWA J., SATO T., IMAIZUMI H., OIZUMI M., OHARA T., WATANABE T., NISHIJIMA S.

72 273 - 273 2005.5

Selective Magnetic Separation Using Narrow Channel Placed in Quadrupole Magnetic Field

FUKUI S., TAKAHASHI M., YAMAGUCHI M., OGAWA J., SATO T., IMAIZUMI H., OIZUMI M., OHARA T., WATANABE T., NISHIJIMA S.

72 111 - 111 2005.5

AC loss characteristics of superconducting strip due to critical current density distribution

OGAWA Jun, FUKUI Satoshi, YAMAGUCHI Mitsugi, SATO Takao, YOSHIDA Toshihide, TSUKAMOTO Osami

2005 ( 13 ) 7 - 11 2005.1

様々な断面形状の高温超伝導コイルの交流損失特性の理論解析

阿部正一, 西條威, 小川純, 福井聡, 山口貢, 佐藤孝雄, 古瀬充穂, 田中秀樹, 新井和昭, 梅田政一

電気学会研究会資料. ASC, 超電導応用電力機器 2005 ( 1 ) 35 - 40 2005.1

AC transport current losses in YBCO tapes in an assembled conductor

NAKAMURA Satoshi, OGAWA Daichi, TSUKAMOTO Osami, OGAWA Jun

2005 ( 1 ) 41 - 46 2005.1

Transport current loss characteristics of HoBaCuO-123 coated conductors with a ferromagnetic substrate subject to DC magnetic field

NAKAYAMA H., ODAKA S., UCHIDA S., TSUKAMOTO O., MIYAGI D., OGAWA J., HAHAKURA S., UEYAMA M., OHMATSU K.

2005 ( 1 ) 47 - 51 2005.1

高温超伝導線材を用いた円形集合導体の交流通電損失の非接触測定法の理論的検討

小島龍一, 渡辺壮, 小川純, 福井聡, 山口貢, 佐藤孝雄, 塚本修巳

低温工学・超電導学会講演概要集 73rd 2005

AC loss characteristics of HTS tapes subject to bending

SUZUKI Hiroyuki, CISZEK M., TSUKAMOTO Osami, OGAWA Jun

71 130 - 130 2004.11

Measurement of AC loss in HTS tape by double saddle shape pick-up coil

OGAWA Jun, FUKUI Satoshi, YAMAGUCHI Mitsugi, KOBAYASHI Yoichi, ONODERA Mitsuru

71 193 - 193 2004.11

AC loss characteristics of YBCO coated conductors with Ag protection layer

J Ogawa, H Nakayama, S Odaka, O Tsukamoto

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 412 ( 2 ) 1021 - 1025 2004.10

Language：English Publisher：ELSEVIER SCIENCE BV

We measured AC transport current and magnetization losses in two samples of YBCO coated conductors with thin (10 mum) and thick (50 mum) Ag protection layers to investigate the influence of the Ag layer on the AC losses. The experiments showed that the Ag layer did not significantly affect AC transport current and magnetization losses in the range of the experiment. Comparing the experimental data with theoretical analyses, it is pointed out that there are some discrepancies and that critical current distributions in the cross-sections of the conductors are a main cause of the discrepancies between the experimental data and theory. (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2004.01.123

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AC loss characteristics of YBCO coated conductors with Ag protection layer

OGAWA Jun, NAKAYAMA Haruki, ODAKA Shunsuke, TSUKAMOTO Osami

2004 ( 1 ) 79 - 82 2004.1

Study on suppression of decay of trapped magnetic field in metal impregnated YBCO bulk caused by application of AC magnetic field

ZUSHI Y., ASABA I., OGAWA J., YAMAGISHI K., TSUKAMOTO O., MURAKAMI M., TOMITA M.

2004 ( 17 ) 31 - 36 2004.1

Measurements of total AC losses HTS short sample wires by electric and calorimetric methods

J Ogawa, Y Yanagihara, Y Yamato, O Tsukamoto

ADVANCES IN CRYOGENIC ENGINEERING, VOLS 50A AND B 711 805 - 811 2004

Language：English Publisher：AMER INST PHYSICS

AC losses in a HTS tape carrying AC transport current in external AC Magnetic field were measured simultaneously by electric and calorimetric methods at the same part of the tape. The electric method uses a rectangular-shaped pick-up coil to measure the magnetization losses and the four terminal method with spiral voltage leads arrangement to measure the transport current losses. The calorimetric method uses a thermo-couple to measure temperature rise of the tape due to the AC losses. The total losses from the electric method which are given by addition of the electrically measured transport and magnetization losses well agreed with the total losses measured by the calorimetric method. This result verified the validity of the both electric and calorimetric methods.

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AC loss characteristics of YBCO coated conductors with Ag protection layer

OGAWA Jun, NAKAYAMA Haruki, ODAKA Shunsuke, TSUKAMOTO Osami

69 104 - 104 2003.12

Study on decay of trapped magnetic field in YBCO bulk due to AC magnetic field

OGAWA Jun, ZUSHI Yusuke, ASABA Isao, YAMAGISHI Kazuhito, TSUKAMOTO Osami, MURAKAMI Masato, TOMITA Masaru

69 192 - 192 2003.12

AC losses in a HTS coil carrying DC current in AC external magnetic field

J Ogawa, Y Zushi, M Fukushima, O Tsukamoto, E Suzuki, M Hirakawa, K Kikukawa

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 392 ( 2 ) 1145 - 1149 2003.10

Language：English Publisher：ELSEVIER SCIENCE BV

We electrically measured AC losses in a Bi2223/Ag-sheathed pancake coil excited by a DC current in AC external magnetic field. Losses in the coil contain two kinds of loss components that are the magnetization losses and dynamic resistance losses. In the measurement, current leads to supply a current to the coil were specially arranged to suppress electromagnetic coupling between the coil current and the AC external magnetic field. A double pick-up coils method was used to suppress a large inductive voltage component contained in voltage signal for measuring the magnetization losses. It was observed that the magnetization losses were dependent on the coil current and that a peak of a curve of the loss factor vs. amplitude of the AC external magnetic field shifted to lower amplitude of the AC magnetic field as the coil current increased. This result suggests the full penetration magnetic field of the coil tape decreases as the coil current increases. The dynamic resistance losses were measured by measuring a DC voltage appearing between the coil terminals. It was observed that the DC voltage appearing in the coil subject to the AC external magnetic field was much larger than that in the coil subject to DC magnetic field. (C) 2003 Elsevier B.V. All rights reserved.

DOI： 10.1016/S0921-4534(03)01112-2

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AC loss characteristics of twisted, multifilament Bi2223/Ag sheathed tapes carrying AC transport currents in AC longitudinal magnetic fields

J Ogawa, M Shiokawa, O Tsukamoto

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 13 ( 2 ) 2364 - 2367 2003.6

Language：English Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

This paper reports on the total AC loss characteristics of a twisted multifilamentary Bi2223/Ag sheathed tape carrying AC transport current in longitudinal AC magnetic field in phase with the transport current. The tape was specially made for the experiment and had wider space between superconducting filaments than a usual multifilamentary Bi/Ag sheathed tape to suppress superconducting bridgings between the filaments. In our experiment the total losses were measured by the electric method. The losses supplied from the longitudinal magnetic field were measured by using a pick-up coil and the losses supplied from the power supply for the transport current by a four terminal method. The measurement results showed that the total losses depended on the direction of the longitudinal magnetic field. In the case that the combined magnetic field produced by the transport current and the external longitudinal magnetic field was nearly parallel to the filaments of the twisted wire, the losses were smaller than those in the case that the combined field was nearly perpendicular to the filaments. This was observed when the amplitude of the longitudinal magnetic field was larger than the full penetration magnetic field of the wire.

DOI： 10.1109/TASC.2003.813070

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AC losses in YBCO coated conductors carrying transport currents in perpendicular AC external magnetic field

J Ogawa, M Shiokawa, M Ciszek, O Tsukamoto

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 13 ( 2 ) 1735 - 1738 2003.6

Language：English Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

The paper reports an experimental study on AC loss characteristics of a YBCO coated tape conductor carrying AC transport current in AC external magnetic field. In the experiment we electrically measured total losses that were transport current losses plus magnetization losses in AC external magnetic fields perpendicular to the tape surfaces. The transport current losses were measured by, a four terminal method and the magnetization losses by a method using a pick-up coil. To measure the total losses electrically we need to pay proper attentions to prevent electromagnetic coupling between the sample currents and the external magnetic fields and to suppress inductive voltage in signals from the pick-up coil and voltage taps. The total losses were purely hysteretic for the amplitude of the external field up to 20 mT and the peak transport current up to the critical current. The loss characteristics can be explained by a theory based on the Bean model if the dependence of the critical current on the external magnetic field is taken into consideration.

DOI： 10.1109/TASC.2003.812876

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Study of Quench Protection for YBCO HTS Coil Under Base Temperature Below 77K

FURUSE Mitsuho, FU Youkun, TSUKAMOTO Osami, OGAWA Jun

68 234 - 234 2003.5

Study to reduce the AC losses in YBCO tape subject to perpendicular magnetic field

OGAWA Jun, TANABE Takehiro, YOSHIDA Hidetaka, TSUAMOTO Osami

68 112 - 112 2003.5

Study of AC Transport Current Losses in Assembled Conductor of HTS Wires by Electrical Method

SUGIURA Kousuke, OGAWA Jun, YAMATO Yasunari, TSUKAMOTO Osami, HONJO Syoichi

68 196 - 196 2003.5

Measurement of Total Losses in HTS wire by Electrical and Calorimetric Method

YANAGIHARA Yasuhiro, OGAWA Jun, YAMATO Yasunari, TSUKAMOTO Osami

68 197 - 197 2003.5

Influence of AC external magnetic field perturbation on trapped magnetic field in HTS bulk

J Ogawa, M Iwamoto, K Yamagishi, O Tsukamoto, M Murakami, M Tomita

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 386 26 - 30 2003.4

Language：English Publisher：ELSEVIER SCIENCE BV

Electric motors and actuators are most promising future applications of HTS bulks. The HTS bulks in these electric machines are exposed to AC magnetic field perturbations. The perturbations cause AC losses in the bulks and also affect the magnetic field trapped in the bulks. In a previous work we measured AC losses in a YBCO bulk subject to the AC magnetic field and. found the loss characteristics well followed the Bean model. In this work we experimentally studied the influence of the AC perturbations of the external magnetic field on the trapped field in a YBCO bulk. The experimental results showed that the application of the AC magnetic field decreased the trapped magnetic field even to zero. In this paper, the experimental results are presented and a reason for the decay of the trapped magnetic field is discussed based on the Bean model. (C) 2002 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0921-4534(02)02114-7

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The Temperature Rise of Superconductor Bulk Due to AC External Magnetic Field

YAMAGISHI Kazuhito, OGAWA Jun, TSUKAMOTO Osami, MURAKAMI Masato, TOMITA Yu

67 241 - 241 2002.10

AC transport current losses in YBCO tape subject to AC external field parallel to tape surface

OGAWA Jun, SHIOKAWA Masashi, TSUKAMOTO Osami

67 198 - 198 2002.10

AC loss measurement of HTS wire subject to AC longitudinal magnetic field

OGAWA Jun, SHIOKAWA Masashi, TSUKAMOTO Osami, AYAI Naoki, HAYASHI Kazuhiko

65 95 - 95 2001.11

Magnetization of HTS bulk-array with alternate polarities

IWAMOTO Masao, IZUHARA Hideshi, OGAWA Jun, TSUKAMOTO Osami, MURAKAMI Masato

62 130 - 130 2000.5

Magnetization loss of YBCO bulk superconductor

IWAMOTO Masao, IZUHARA Hideshi, OGAWA Jun, TSUKAMOTO Osami, MURAKAMI Masato

62 178 - 178 2000.5

AC loss characteristics of YBCO tape

TSUKAMOTO O., CISZEK M., OGAWA J., KASUU O., II H., TAKEDA K., SHIBUYA M.

2000 ( 1 ) 13 - 17 2000.1

AC transport current loss of YBCO superconducting tape on DC external magnetic field

MIYAGI Daisuke, OGAWA Jun, TSUKAMOTO Osami, KASUU Osamu, II Hideki, TAKEDA Kaoru, SHIBUYA Masatoyo

1999 ( 36 ) 1 - 5 1999.7

Total Loss in Bi-2223/Ag Superconducting Multifilamentary Sheathed Tapes

OGAWA Jun, CISZEK Marian, TSUKAMOTO Osami, HAYASHI Kazuhiko, UYEYAMA Munetsugu

1999 ( 36 ) 19 - 23 1999.7

Loss and magnetization characteristics of YBCO bulk in AC magnetic field

IWAMOTO Masao, IZUHARA Hideshi, OGAWA Jun, TSUKAMOTO Osami, MURAKAMI Masato

2000 ( 39 ) 91 - 94 1999.6

Magnetization of bulk array with alternate polarities for superconducting linear actuator

IWAMOTO Masao, IZUHARA Hideshi, OGAWA Jun, TSUKAMOTO Osami, MURAKAMI Masato

2000 ( 39 ) 101 - 104 1999.6

AC Transport Current Loss of YBCO Superconductiong Tape in External DC Magnetic Field

MIYAGI Daisuke, OGAWA Jun, TSUKAMOTO Osami, KASUU Osamu, II Hideki, TAKEDA Kaoru, SHIBUYA Masatoyo

60 240 - 240 1999.6

AC Transport Current Loss of High-Temperature Superconducting Film Prepared on Single-Crystal Substrate

MIYAGI Daisuke, OGAWA Jun, TSUKAMOTO Osami, KUDO Yuki, KUBOTA Hiroshi, YAMAZAKI Mutsuki, YOSHINO Hisashi

60 146 - 146 1999.6

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