Faculty Profiles - UEDA Hiroshi

MISC - UEDA Hiroshi

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YBCO超電導線材の過電流パルス通電による特性劣化の評価

西尾幸恭, WANG Xudong, 植田浩史, 河野秀太郎, 伊豫田章悟, 石山敦士, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 飯島康裕, 斎藤隆, 八木正史, 向山晋一, 山田穣, 町敬人, 塩原融

低温工学・超電導学会講演概要集 77th 2007

Over-current Characteristics of 1m-Long Superconducting Model Cable using YBCO Coated Conductors-Experiment and Simulation-

UEDA H.

The Papers of Technical Meeting on Application of Superconductivity, IEE Japan 7 19 - 23 2007

A Stability Criterion for design of YBCO Coated Conductors and Coils based on Quench Protection

A. Ishiyama, H. Ueda, T. Ando, H. Naka, S. Banba, Y. Shiohara

Applied Superconductivity Conference 2006 2006

Position Control of Active Magnetic Levitation using YBCO Bulk and Multiple Electromagnets

Y. Ito, H. Ueda, K. Agatsuma, A. Ishiyama

7TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'05) 43 987 - 990 2006

Language：English Publisher：IOP PUBLISHING LTD

We have been developing an active magnetic levitation system composed of field-cooled disk-shaped YBCO bulk and multiple ring-shaped electromagnets which are vertically piled up. We have demonstrated and reported that the levitation height, as well as stability, can be remarkably improved by adjusting the operating current of each electromagnet individually. In this study, we constructed a noncontact position control system in the vertical direction based on the feedback control theory and the electromagnetic field analyses considering superconducting characteristics of the YBCO bulk. Depending on levitation height, the operating current in the electromagnets is controlled automatically. The system consists of two ring-shaped copper-winding electromagnets without iron core and a ring-shaped YBCO bulk magnetized by the field-cooling process. We carried out experiments to verify the feasibility of noncontact position control system. In the experiment for position control, the levitation height maintained a target position accurately, and responded smoothly to changing target position. In addition, we aimed at the construction of the position control system with higher accuracy using the numerical simulation based on the finite element method analyses. And, the position control system that piled up three electromagnets was designed and constructed. Concretely, accuracies of the position control within 28 mu m were obtained. Final goal of our study is to apply the levitation system to the inertial nuclear fusion in which the accuracy as high as several mu m would be required.

DOI： 10.1088/1742-6596/43/1/241

Web of Science

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Operational Characteristics of Linear Synchronous Actuator with Field-Cooled YBCO Bulk Secondary

T. Shibata, H. Ueda, K. Agatsuma, A. Ishiyama

7TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'05) 43 975 - 978 2006

Language：English Publisher：IOP PUBLISHING LTD

It is expected that electric devices would be high efficiency, high output and downsized by using high-temperature superconducting (HTS) bulk materials. In the previous study, we have fabricated and tested a linear synchronous actuator with double-sided primary and YBCO bulk secondary; the linear actuator consists of a field-cooled YBCO bulk for secondary (mover) and copper windings with an iron core as a primary. The primary, which was excited by a three-phase VVVF (variable voltage variable frequency) power source to generate sinusoidal traveling magnetic fields, was divided into two sections: 1) the starting section in which the secondary is accelerated as an induction machine; and 2) the synchronous section in which the secondary moves with a specified synchronous speed. And we have evaluated both of the static and dynamic characteristics on this linear synchronous actuator. However, for practical use of linear actuator with field-cooled HTS bulk secondary, it is required to examine the distribution of magnetic field within the HTS bulk which is exposed to the traveling magnetic field in a realistic operational environment of linear actuator. Therefore, in this study, we repeated the mode of acceleration, constant-speed, deceleration and stop with the control circuit in the synchronous section. The direction of the mover can be turned automatically by the switching device and it made round-trip running possible. Then, we carried out many times round-trip operations and evaluated the change of the magnetic field on the surface of the YBCO bulk in various conditions with trapped field of the secondary and traveling magnetic field generated by the primary windings.

DOI： 10.1088/1742-6596/43/1/238

Web of Science

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YBCO超電導線材を用いた超電導ケーブル導体の過電流特性解析

植田浩史, 岩田拓也, WANG Xudong, 石山敦士, 向山晋一, 塩原融

低温工学・超電導学会講演概要集 75th 2006

着磁したバルク超電導体を二次側走行子に適用したリニア同期アクチュエータの特性評価

菅兼治, 植田浩史, 石山敦士

低温工学・超電導学会講演概要集 74th 2006

冷凍機伝導冷却YBCO超電導コイルの熱特性評価解析

石山敦士, 安東武利, 番場貞徳, 植田浩史, 富士広, 斉藤隆, 塩原融

低温工学・超電導学会講演概要集 75th 2006

超電導送電ケーブルを想定した並列接続YBCO超電導線材の過渡的安定性評価(1.実験)

石山敦士, WANG Xudong, 岩田拓也, 植田浩史, 向山晋一, 塩原融

低温工学・超電導学会講演概要集 75th 2006

YBCO線材の過電流パルス通電による特性劣化について(1)-安定化層の厚みの影響-

WANG Xudong, 番場貞徳, 植田浩史, 石山敦士, 飯島康裕, 斎藤隆, 塩原融

低温工学・超電導学会講演概要集 74th 2006

超電導送電ケーブルを想定した並列接続YBCO超電導線材の過渡的安定性評価(2.シミュレーション)

石山敦士, 岩田拓也, WANG Xudong, 植田浩史, 向山晋一, 塩原融

低温工学・超電導学会講演概要集 75th 2006

蛍光剤を用いた2次元温度分布観測システムによるYBCO線材の常電導転移・伝播の可視化

石山敦士, 土屋元計, 植田浩史, 加藤英幸, 奈良広一, 塩原融

低温工学・超電導学会講演概要集 75th 2006

球状バルク超電導体を用いたアクティブ磁気浮上の位置制御(実験)

菅兼治, 石垣善弘, 植田浩史, 我妻洸, 石山敦士

低温工学・超電導学会講演概要集 75th 2006

コイル保護に基づくYBCO線材の安定化層厚の決定法(1)-決定法の提案-

石山敦士, 安東武利, 植田浩史, 塩原融

低温工学・超電導学会講演概要集 74th 2006

YBCO超電導線材の過電流パルス通電による特性劣化

田中康武, WANG Xudong, 植田浩史, 石山敦士, 飯島康裕, 斉藤隆, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 加藤丈晴, 町敬人, 塩原融

低温工学・超電導学会講演概要集 75th 2006

バルク超電導体のピン止め力を用いたパイプライン搬送装置の基礎特性実験

石垣善弘, 土屋元計, 植田浩史, 我妻洸, 石山敦士

低温工学・超電導学会講演概要集 74th 2006

コイル保護に基づくYBCO線材の安定化層厚の決定法(2)-適用例-

石山敦士, 安東武利, 植田浩史, 塩原融

低温工学・超電導学会講演概要集 74th 2006

YBCO線材の過電流パルス通電による特性劣化について(2)-線材の長さ・運転温度の影響-

番場貞徳, WANG Xudong, 植田浩史, 石山敦士, 飯島康裕, 斎藤隆, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 町敬人, 塩原融

低温工学・超電導学会講演概要集 74th 2006

球状バルク超電導体を用いたアクティブ磁気浮上の位置制御(シミュレーション)

石垣善弘, 菅兼治, 植田浩史, 我妻洸, 石山敦士

低温工学・超電導学会講演概要集 75th 2006

球状バルク超電導体を用いたアクティブ磁気浮上の位置制御

植田浩史, 菅兼治, 我妻洸, 石山敦士

低温工学・超電導学会講演概要集 74th 2006

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