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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Nagaya, K. Kosugi, Y. Suzuki, T. Murakami, I. |
| Copyright Year | 2002 |
| Abstract | A simple but stable noncontact high T/sub c/ superconducting levitation system with a vertical shaft has been presented. The system consists of a superconductor and permanent magnets. In the system, only a high T/sub c/ superconductor supports the lower end of the shaft, and the other end is supported by two ordinary permanent magnets. Since the restoring force is small with respect to the radial direction, the system becomes unstable when the force acts in the radial direction, so it is difficult to drive the shaft by electromagnetic forces when using motors. A driving system using electromagnets has been presented, in which the balanced forces act on two opposite sides of the disc-type rotor in the axial direction. Since the system has no unbalanced force from an analytical point of view, the rotor will be able to rotate without control. In the system, however, since there is eccentricity between the center of rotation and the magnetic center, vibrations are generated. This study also presents an optimal control method for the vibrations. To validate the proposed system and the control method experimental tests have been carried out. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 4688 |
| Ending Page | 4694 |
| Page Count | 7 |
| File Size | 233581 |
| File Format | |
| ISSN | 10518223 |
| Volume Number | 9 |
| Issue Number | 4 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1999-12-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | High temperature superconductors Levitation Superconducting magnets Shafts Permanent magnet motors Permanent magnets Rotors Control systems Electromagnetic forces Electromagnets |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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