| Project/Area Number |
08455128
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
OHSAKI Hiroyuki Univ.of Tokyo, Dept.of Elec.Eng., Assoc.Prof., 大学院工学系研究科, 助教授 (10203754)
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| Co-Investigator(Kenkyū-buntansha) |
TAMURA Minoru Univ.of Tokyo, Dept.of Elec.Eng., Assistant, 大学院工学系研究科, 助手 (00011180)
MASADA Eisuke Univ.of Tokyo, Dept.of Elec.Eng., Professor, 大学院工学系研究科, 教授 (40010706)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥8,000,000 (Direct Cost: ¥8,000,000)
Fiscal Year 1997: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1996: ¥6,200,000 (Direct Cost: ¥6,200,000)
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| Keywords | magnetic levitation / superconductivity / electromagnetic force / magnetic gradient / bulk / critical current density / stability / numerical analysis |
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| Research Abstract |
We have studied a magnetic gradient levitation system that has high-temperature bulk superconductors and soft ferromagnetic materials like iron as essential components. Measurements of electromagnetic field and force and finite element analysis were carried out to find its potentials and subjects to be investigated further.
1. Experimental study on electromagnetic characteristics
(1) Permanent magnet type mixed-mu levitation : Measurements of electromagnetic force acting on an iron rail placed between bulk superconductors proved the stabilization effect of electromagnetic force by the bulk superconductors and the generation of restoring force. A longer iron rail made the electromagnetic force characteristics less stable.
(2) Bulk superconducting magnetic gradient levitation : Although the magnitude of an initial applied field influenced the stability of electromagnetic force due to the finite critical current density of the superconductors, the restoring force was obtained for a lower applied field. The strong influence of the iron rail length on the force characteristics was also observed.
2. Numerical analysis of electromagnetic characteristics : Dependence of electromagnetic characteristics on the geometrical configuration of bulk superconductors and an iron rail, the finite critical current density of the superconductors and the three dimensional structure of magnetic field were investigated by numerical analysis methods. The results agreed well with the experimental results and gave good understanding of the electromagnetic phenomena in the system.
3. Application systems : When the magnetic gradient levitation using bulk superconductors is applied to a linear transportation system, the shielding of the magnetic field component in the moving direction is required. Magnetic bearing application has a large potential.
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