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Mechanics of superconducting magneti...

Chang, Pei-Zen.

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Mechanics of superconducting magnetic bearings.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Mechanics of superconducting magnetic bearings./
作者:	Chang, Pei-Zen.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1991,
面頁冊數:	181 p.
附註:	Source: Dissertations Abstracts International, Volume: 52-09, Section: B.
Contained By:	Dissertations Abstracts International52-09B.
標題:	Mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9113307

Mechanics of superconducting magnetic bearings.
Chang, Pei-Zen.

Mechanics of superconducting magnetic bearings. - Ann Arbor : ProQuest Dissertations & Theses, 1991 - 181 p.

Source: Dissertations Abstracts International, Volume: 52-09, Section: B.

Thesis (Ph.D.)--Cornell University, 1991.

This item must not be sold to any third party vendors.

In this dissertation, the static and dynamic characteristics of passive superconducting magnetic bearings using high-temperature Type-II superconducting ceramics are studied. Emphasis is on the magnetic-force interactions between permanent magnets and bulk high-temperature Type-II superconducting ceramics in the mixed state. The results derived from this study can be applied to electromechanical devices using high-temperature superconductors as force-generating or vibration-eliminating elements. Levitation forces and lateral forces in relation to the gaps in superconducting bearings were measured using a beam-and-camera system. Dynamic magnetic stiffness derived from vibration tests were compared to static magnetic stiffness. The relaxation of magnetic forces as a function of time was measured as well. The behavior of levitation forces at temperatures form 4.2 K to 77 K were studied. A rotor equipped with two superconducting bearings was fabricated and was spun up to 120,000 RPM. The drag torques acting on the rotor were measured at bot atmospherical pressure and at a partial vacuum of a few mm Hg. Many high-temperature superconductors of different compositions of fabricated through different processing techniques were investigated by measuring the magnetic force-gap relationships. The data indicated that YBa$\\sb2$Cu$\\sb3$O$\\sb7$ specimens made of melt-quench process produced the largest magnetic forces obtained in the laboratory so far. Models predicting the magnetic forces between superconductors and externally applied magnetic fields were studied. A numerical scheme based on the magnetization model was developed. The calculated levitation force-gap relationships showed a reasonable agreement with experimental results.Subjects--Topical Terms:

525881
Mechanics.

Mechanics of superconducting magnetic bearings.
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100 1 $a Chang, Pei-Zen. $3 3434418
245 1 0 $a Mechanics of superconducting magnetic bearings.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1991
300 $a 181 p.
500 $a Source: Dissertations Abstracts International, Volume: 52-09, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
502 $a Thesis (Ph.D.)--Cornell University, 1991.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a In this dissertation, the static and dynamic characteristics of passive superconducting magnetic bearings using high-temperature Type-II superconducting ceramics are studied. Emphasis is on the magnetic-force interactions between permanent magnets and bulk high-temperature Type-II superconducting ceramics in the mixed state. The results derived from this study can be applied to electromechanical devices using high-temperature superconductors as force-generating or vibration-eliminating elements. Levitation forces and lateral forces in relation to the gaps in superconducting bearings were measured using a beam-and-camera system. Dynamic magnetic stiffness derived from vibration tests were compared to static magnetic stiffness. The relaxation of magnetic forces as a function of time was measured as well. The behavior of levitation forces at temperatures form 4.2 K to 77 K were studied. A rotor equipped with two superconducting bearings was fabricated and was spun up to 120,000 RPM. The drag torques acting on the rotor were measured at bot atmospherical pressure and at a partial vacuum of a few mm Hg. Many high-temperature superconductors of different compositions of fabricated through different processing techniques were investigated by measuring the magnetic force-gap relationships. The data indicated that YBa$\\sb2$Cu$\\sb3$O$\\sb7$ specimens made of melt-quench process produced the largest magnetic forces obtained in the laboratory so far. Models predicting the magnetic forces between superconductors and externally applied magnetic fields were studied. A numerical scheme based on the magnetization model was developed. The calculated levitation force-gap relationships showed a reasonable agreement with experimental results.
590 $a School code: 0058.
650 4 $a Mechanics. $3 525881
690 $a 0346
710 2 $a Cornell University. $3 530586
773 0 $t Dissertations Abstracts International $g 52-09B.
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791 $a Ph.D.
792 $a 1991
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9113307