TAILIEUCHUNG - Superconductivity Theory and Applications Part 8

Tham khảo tài liệu 'superconductivity theory and applications part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 164 Superconductivity - Theory and Applications Fig. 11. X dependence of vertical force for Z 12 mm. Equilibrium angle measurement In addition to previous experiments the mechanical behavior of a magnet which has the ability to tilt over the superconductor in the Meissner state was also studied in this paper. In the present experiment only one degree of freedom was permitted in the tilt angle of the magnet 0 coordinate . The equilibrium angle of the permanent magnet over the cylindrical superconductor was measured for different relative positions. The results can be used to understand not only how the permanent magnet is repelled but also how it turns when it is released over a superconductor. Fig. 12. Measurement system 1 - Superconductor bulk 2 - Permanent magnet 3 -Goniometer 4 - Bearing hidden 5 - 3D table 6 - Lab jack stand 7 - Nitrogen vessel. Foundations of Meissner Superconductor Magnet Mechanisms Engineering 165 A cylindrical permanent magnet made of NdFeB with a coercivity of 875 kA m and a remanence of T was placed over the superconductor. Their dimensions were mm in diameter and mm in length and it had a magnetization direction parallel to its axis of revolution. A rigid plastic circular rod was fixed in the center of mass perpendicular to the axis of revolution. This rod was used as the shaft in a plastic bearing which was lubricated with oil. The whole bearing system was joined to a 3D displacement table. This arrangement ensured it was possible to control the position of the permanent magnet with an accuracy of mm and the only permitted degree of freedom was the rotation around the Y axis. Concentric to the bearing a graduate goniometer measured the angle of rotation of the magnet. The whole experiment design is shown in Fig 12. Fig. 13 shows the comparison between the equilibrium angles measured and those calculated by expression 19 . Fig. 13. Comparative graph between experimental and FEA calculus of the equilibrium angle .

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