Analytical simulation of superconducting torque transferring mechanism

Wongsatanawarid, A.; Ikeda, M.; Seki, Hiroya; Nagashima, K.; Murakami, Masato

doi:10.1016/j.physc.2009.05.116

Cited by 4 publications

(6 citation statements)

References 7 publications

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“…The T c s were 93-93.5 K, and the J c s at 77 K and 0 T were 6.0-7.5 × 10 4 A cm −2 , which are similar to those reported in other works [16]. It was reported for a process using a binder material [13] or carbon fibers to make artificial holes [14] that the thermal events for the Gd123 growth were significantly influenced by the addition of organic materials. As a result of the change in thermal events, it was very difficult to fabricate single-grain RE123 bulk superconductors [13,14].…”

Section: Resultssupporting

confidence: 87%

“…Since the report on the effectiveness of artificial holes, many studies have been attempted to develop techniques that can make artificial holes in RE123 bulk superconductors [8][9][10][11][12][13][14]. One possible way is to perforate sintered or melt growth processed hard bodies by mechanical drilling [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, this method is a time-consuming process. An alternative way is to add an organic binder (polyvinyl alcohol) to precursor powders so as to soften the powder compacts [13]. The use of the binder material suppresses cracking during drilling.…”

Section: Introductionmentioning

confidence: 99%

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Simple die pressing for making artificial holes in single-grain Gd_1.5Ba₂Cu₃O_7−ysuperconductors

Kim¹,

Park²,

Jun³

et al. 2012

Supercond. Sci. Technol.

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The presence of artificial holes in single-grain REBa2Cu3O7−y (RE123, RE: rare-earth elements) bulk superconductors can facilitate oxygen diffusion into superconducting grains through the increased surface area. In addition to the enhancement of oxygen diffusion, the mechanical properties and thermal conductivity of bulk superconductors can be improved by filling holes with a metallic conductive phase. This study presents a new and simple hole-making process for single-grain RE123 bulk superconductors. Artificial holes 3 or 5 mm in diameter were made for Gd1.5Ba2Cu3O7−y (Gd1.5) powder compacts prior to the sintering/melt growth process using specially designed pressing dies. The die pressing neither induced cracking in powder compacts nor influenced thermal procedures for the Gd123 growth. Single-grain Gd1.5 bulk superconductors with holes were successfully fabricated by a top-seeded melt growth (TSMG) process using Gd1.5 powder compacts with holes. The die pressing was proven as a time-saving process in comparison with the conventional method which makes holes in sintered or melt-processed hard bodies by mechanical drilling. The detailed fabrication process of single-grain Gd1.5 bulk superconductor with holes, magnetic levitation forces, and magnetic flux density, estimated for the single-grain Gd123 bulk superconductors with holes, are reported.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Simple die pressing for making artificial holes in single-grain Gd_1.5Ba₂Cu₃O_7−ysuperconductors

Kim¹,

Park²,

Jun³

et al. 2012

Supercond. Sci. Technol.

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show abstract

“…For this purpose, a magnet circuit must have a multi-pole configuration like NSNS. When field-cooled with such a magnetic circuit in face, a single domain bulk superconductor is magnetized like a mirror image, in that almost the same pole configuration of NSNS is trapped [2,3]. Thus we fabricated a multi-domain superconductor, and confirmed that it could have almost the same torque transferable forces as a single domain.…”

Section: Introductionmentioning

confidence: 53%

Crack reduction in a large bulk Y–Ba–Cu–O superconductor through liquid binder addition

Wongsatanawarid

Seki

Kobayashi

et al. 2010

Physica C: Superconductivity and its Applications

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“…However, when adopting these elements in some special situations, such as the mixing of medicine solutions or the stirring separation of nucleic acid of COVID-19, the requirements of ultra-clean and zero-leakage cannot be fulfilled very well. The MPT components must penetrate the stirring container with the accompany of bearings and seals [ 5 ]. The bearings will inevitably cause wear debris and the seal cannot realize the absolute isolation [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Contactless Mechanical Power Transmission Through the High-Tc Superconducting Pinning Effect

Liu

et al. 2021

J Supercond Nov Magn

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Mechanical power transmission (MPT) components are almost indispensable for every engineering equipment with motions. In order to satisfy some rigorous requirements, such as contamination free and zero leakage in the mixing process of biomedical solutions, a contactless MPT mode was proposed in this study based on the high- T c superconducting flux pinning mechanism. It makes the stirring container with the driven part inside that can be totally isolated from the external environment. The physical principle of superconducting flux pinning effect was discussed firstly to explore a feasible structural scheme, which can completely restrain all the six degrees of freedom (DOFs) by the linkage of magnetic flux lines. Then, a measurement device was established to verify and investigate the proposed contactless MPT mode. The motion can be transferred synchronously from the superconducting driving part to the permanent magnet driven part since they are unified as an integrity through the pinned flux lines. The influence of driving speed, cooling clearance, and magnet arrangement on the transmitted torque was analyzed. The verified contactless MPT mode also has the advantages of self-stability and overload protection, which can avoid the drawbacks of traditional permanent magnetic transmission mode.

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Analytical simulation of superconducting torque transferring mechanism

Cited by 4 publications

References 7 publications

Simple die pressing for making artificial holes in single-grain Gd_1.5Ba₂Cu₃O_7−ysuperconductors

Simple die pressing for making artificial holes in single-grain Gd_1.5Ba₂Cu₃O_7−ysuperconductors

Crack reduction in a large bulk Y–Ba–Cu–O superconductor through liquid binder addition

Contactless Mechanical Power Transmission Through the High-Tc Superconducting Pinning Effect

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Analytical simulation of superconducting torque transferring mechanism

Cited by 4 publications

References 7 publications

Simple die pressing for making artificial holes in single-grain Gd1.5Ba2Cu3O7−ysuperconductors

Simple die pressing for making artificial holes in single-grain Gd1.5Ba2Cu3O7−ysuperconductors

Crack reduction in a large bulk Y–Ba–Cu–O superconductor through liquid binder addition

Contactless Mechanical Power Transmission Through the High-Tc Superconducting Pinning Effect

Contact Info

Product

Resources

About

Simple die pressing for making artificial holes in single-grain Gd_1.5Ba₂Cu₃O_7−ysuperconductors

Simple die pressing for making artificial holes in single-grain Gd_1.5Ba₂Cu₃O_7−ysuperconductors