超導體具有特殊的鎖磁特性，在不需控制的情況下能使永久磁鐵穩定的磁浮在超導體的上方。本研究嘗試以超導體、永久磁鐵和直流線圈建立一個新型的磁浮系統，利用超到體對永久磁鐵的鎖磁特性，在線圈通入微小的直流電時，磁鐵能產生微奈米尺度的移動，以減少電路數設計與控制上的複雜性，提供微奈米級移動系統一個新的方式。

　　超導體分別由液態氮和低溫冷凍機(cryo-cooler)冷卻，在實驗的初期階段兩種系統均可使磁鐵達到數個微米的移動。本實驗以Bean Model計算線圈電流與磁鐵位移之間的關係，探討超導體、永久磁鐵和線圈三者之間的行為模式，理論計算的結果顯示電流與磁鐵位移間呈現線性關係，這與實驗的結果相吻合。

　For developments of scientific and technically application, the size of devices has been reduced from centimeters to micrometers. In order to control the displacement within micro/nano-scale, in this study, an active-maglev system composed of an YBCO bulk and a permanent magnet in a DC magnetic field was constructed. The magnetic field, its magnitude and distribution can be estimated, is generated by the coil. There are two important issues of this system: (1) Flux trapping occurs between a superconductor and magnet is a stable state, (2) A magnetic field can be controlled by the input current density of a coil.

　Stable levitation can be achieved without any control system when the permanent magnet is levitated above the YBCO bulk superconductor, which is cooled by liquid nitrogen and cryo-cooler respectively. The levitation height of permanent magnet is adjusted by changing small operating current in the coil with the sensibility of A, and the result shows that small-scale displacement can be achieved in these two systems. Through the optic-fiber displacement sensor, the displacement under 5 micro-meters can be measured. The relationship between applied current and displacement is determined by the liner fitting.

1. Michel Cyrot and Davor Pavuna, Introduction to Superconductivity and High-Tc Materials, World Scientific Inc. Press, 1992.
2. C.P. Bean, Rev. Mod. Phys., Vol. 36,pp. 31, 1964.
3. P. W. Anderson and Y. B. Kim, Rev. Modern Physics, pp. 39-45, Jan. 1964.
4. In-Gann Chen, Jianxiong Liu, Roy Weinstein, and Kwang Lau, J. App. Phys. Vol. 72, No. 3, pp. 1013-1020, 1992.
5. Jianxiong Liu, In-Gann Chen, Roy Weinstein, and Jianchun Xu, J. App. Phys., Vol. 73, No. 10, pp. 6530-6532, 1993.
6. R. Weinstein, In-Gann Chen, J. Liu, R. Narayanan, Y. R. Ren, and J. Xu, Applied Superconductivity, Vol. 1, No. 7-9, pp. 1145-1155, 1993.
7. In-Gann Chen and Roy Weinstein, IEEE Transactions on Applied Superconductivity, Vol.3, No. 1, pp. 1041-1044, 1993.
8. Roy Weinstein, Y. Ren, J. Liu, In-Gann Chen, et. al., Presented at 6th International Symposium on Superconductivity, Hiroshima, Japan, Oct. 1993.
9. In-Gann Chen, Materials Transactions, JIM, Vol. 37, No. 3, pp.509-513, 1996.
10. In-Gann Chen, Jen-Chou Hsu, Gwo Jamn, and M. K. Wu, J. App. Phys., Vol. 81, No. 8, 1997.
11. Y. H. Zhang, A. Parikh and K. Salama, IEEE Transactions on Applied Superconductivity, Vol. 7, No. 2, pp. 1787-1792, 1997.
12. T. Higuchi, N. Sakai, and M. Murakami, IEEE Transactions on Applied Superconductivity, Vol. 5, No. 2, pp. 1818-1821, 1995.
13. R. Yu. J. Mora, S. Pinol, et. al., IEEE Transactions on Applied Superconductivity, Vol. 7, No. 2, pp. 1809-1812, 1997.
14. T. Sugiura, H. Hashizume, and K. Miya, International J. of App. Electromagnetics in Materials, Vol. 2, pp. 183-196, 1991.
15. B. D. Cullity, Introduction To Magnetic Materials, 1972.
16. 徐振州，國立成功大學材料科學及工程學系碩士論文，民八十六年。
17. Kurt Mendelssohn, 絕對零度的探索–低溫物理趣談，凡異出版社印行，民八十一年。
18. 章立源，超導體，亞東書局印行，民八十一年。
19. 張裕恒、李玉芝，超導物理，儒林圖書公司印行，民八十一年。
20. 曾煥華 譯，超導體的世界，銀禾文化事業有限公司，民八十五年。
21. 郭晉辰，高溫超導塊材與磁場相互作用力之研究，國立成功大學材料科學及工程學系碩士論文，民八十六年
22. 曾小東 光學感測與量測，五南出版社，民九十三年
23. Yukikazu Iwasa , Haigun Lee, Magnetic levitation of a superconducting disk with a DC field generated by electromagnets, part 1. Crogenics37(1997)807-816
24. Makoto Tsuda, Haigun Lee, Yukikazu Iwasa, Magnetic levitation of a superconducting disk with a DC field generated by electromagnets, part 3. Crogenics37(1998)743-756
25. Kwang Suk Jung, “Deveelopment of a novel maglev positioner with self-stabilizing property, Mechatronics12(2002)771-790