First Heavy Load Bearing for Industrial Application with Shaft Loads up to 10 kN

Walter, H.; Böck, J.; Flindt, Christian; Schippl, K.; May, H.; Canders, W.‐R.; Kummeth, P.; Nick, W.; Neumueller, H.-W.

doi:10.1088/1742-6596/43/1/243

Cited by 30 publications

(24 citation statements)

References 4 publications

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“…Originated from the persistently flowing induced current, the bulk disks are usually impressed by the trapped field or levitation force in macroscopic applications, thus bringing two main magnetic applications, namely, levitation and trapped-field magnet devices. In the levitation aspect, the notable advantage of passive levitation has been fully demonstrated with the prototypes of superconducting maglev vehicles [3]- [5]; superconducting magnetic bearings and flywheel-based energy storage systems [6]- [9]; and superconducting noncontact conveyers, mixers, or torque transfers [10,11]. While in the trapped-field magnet aspect, with the continuous material improvements in pinning doping, thermal stability, and mechanical properties, the peak trappedfield values of single-grain RE-Ba-Cu-O have reached 3 T at 77 K [12], 11 T at 47 K [13], and 17 T at 29 K [14].…”

Section: Introductionmentioning

confidence: 99%

Trapped Flux and Levitation Properties of Multiseeded YBCO Bulks for HTS Magnetic Device Applications—Part II: Practical and Achievable Performance

Deng

Izumi

Miki

et al. 2012

IEEE Trans. Appl. Supercond.

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After clarifying the essential characteristics of the multiseeded YBCO bulk in the previous work, that is, the existence of strongly connected or coupled grain boundaries between two grains by means of intergrain super current with a big flowing loop size, this paper proceeds to report its achievable performance in actual excitation conditions by working as trapped-field magnets or levitation devices. Besides evaluation of the trapped-flux characteristics by two most popular excitation methods, namely, static field-cooling magnetization (FCM) and pulsed-field magnetization in liquid nitrogen (LN2), the trapped-flux capability at lower temperatures up to 30 K, an interesting temperature for present superconducting machine applications, is also reported. From LN2 temperature to 30 K, the trapped flux with over six times improvement from 0.64 to 3.91 T was observed by FCM, at the same time along with a much decreased relaxation rate from 13.7% to 0.9% in 1-h measurements. In the aspect of levitation applications, the magnetic force density (both levitation force and guidance force, two most important performance parameters for maglev) above a permanent magnet guideway with Halbach style is measured and found to be able to promote the loading and stability performance of the first high-temperature superconducting maglev test vehicle simultaneously. As the multiseeding technique of the top-seeded melt-growth process has provided a promising way to fabricate bulk superconductors with large size, time saving and cost reduction, the presented trapped-flux and magnetic force results may help to comprehend, refer, and finally make better use of the multiseeded bulks in the large-scale superconducting magnetic devices.

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Section: Introductionmentioning

confidence: 99%

Trapped Flux and Levitation Properties of Multiseeded YBCO Bulks for HTS Magnetic Device Applications—Part II: Practical and Achievable Performance

Deng

Izumi

Miki

et al. 2012

IEEE Trans. Appl. Supercond.

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“…During operation, the activation of the HTS by PM is accomplished via the field‐cooled mode, which provides a high stiffness and passive stability in all directions. Such a heavy‐load bearing for industrial applications with shaft loads up to 10 kN was developed by Nexans SuperConductors (Huerth, Germany) together with the TU Braunschweig and Siemens AG (Erlangen, Germany) 36 . A novel feature of this design is the subdivision of the cylindrical stator, which consists of two half shells.…”

Section: Applications Of Bulk Melt‐processed Ybacuo/rebacuomentioning

confidence: 99%

“… Superconducting magnetic bearing with a conventional and an advanced force activation with movable high‐temperature superconductors (HTS) half‐shells. 36 …”

Section: Applications Of Bulk Melt‐processed Ybacuo/rebacuomentioning

confidence: 99%

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YBaCuO and REBaCuO HTS for Applications

Freyhardt

2007

Int J Applied Ceramic Tech

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The discovery of electrical conductors that carry loss‐less currents at liquid nitrogen temperatures and above, high‐temperature superconductors (HTS), inspired the imaginations of scientists and engineers in an unprecedented way. It culminated in a broad search for an understanding of their basic phenomena and properties, but also for new classes of the HTS. The availability of these materials created novel ideas of their use for effective and economical generation, transport, and use of electric energy. YBaCuO and related REBaCuO HTS compounds still belong to the most attractive workhorses. This contribution intends to illustrate the efforts to manufacture from these HTS bulk monoliths, wires, tapes, or conductors, which would be needed for novel components and devices for electrical and power engineering, devices that offer not only an effective use of energy but also broad environmental benefits and, furthermore, help to safe resources. The research and developments discussed are mainly focused on efforts in Europe.

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“…The applications of bulk superconductors can be clarified mainly into two aspects: levitation devices and trapped-field magnet devices. In the levitation aspect, the notable advantage of passive levitation has been impressively demonstrated with the prototypes of superconducting maglev vehicles [3], superconducting magnetic bearings [4] and its based flywheel energy storage systems [5], [6], superconducting non-contact conveyers, mixers or torque transfers [7]. While in the trapped- field magnet aspect, with the continuous material improvements in pinning doping, thermal stability and mechanical properties, the peak trapped field values of single-grain RE-Ba-Cu-O have reached 3 T at 77 K [8], 11 T at 47 K [9], and 17 T at 29 K [10].…”

Section: Introductionmentioning

confidence: 99%

Pulsed Field Magnetization Properties of Bulk RE-Ba-Cu-O as Pole-Field Magnets for HTS Rotating Machines

Deng

Miki

Tsuzuki

et al. 2011

IEEE Trans. Appl. Supercond.

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Aiming at exploiting the high trapped field ability of bulk high-temperature RE-Ba-Cu-O (RE: rare-earth elements) superconductors, a brushless axial-gap type superconducting synchronous motor has been successfully developed as a technology demonstrator using eight melt-textured GdBa 2 Cu 3 O y (Gd-123) bulks as pole-field magnets. An output power of 10 kW at 720 rpm was realized by an average trapped field peak of 0.56 T reaching the armature coils, under a pulsed field excitation at the liquid nitrogen temperature. For such motors, to improve the trapped flux of bulks is a direct way to enhance the motor performance. In order to obtain a high trapped flux density with a regular shape for a high performance motor utilization, the pulsed field magne- tization (PFM) properties of two kinds of bulk superconductors have been investigated. By a reasonable multi-PFM process with a pair of vortex-type pulsed coils, it was found that the multi-seed Y-Ba-Cu-O bulk can bring a high average trapped field, while the single-grain Gd-Ba-Cu-O bulk under a size-adjustable pulsed coilcan obtain a very regular trapped field distribution. These results will be useful to the following optimization of the rotating machine system.Index Terms-High temperature superconductors, pole-field magnets, pulsed field magnetization, rotating machines, trapped field.

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First Heavy Load Bearing for Industrial Application with Shaft Loads up to 10 kN

Cited by 30 publications

References 4 publications

Trapped Flux and Levitation Properties of Multiseeded YBCO Bulks for HTS Magnetic Device Applications—Part II: Practical and Achievable Performance

Trapped Flux and Levitation Properties of Multiseeded YBCO Bulks for HTS Magnetic Device Applications—Part II: Practical and Achievable Performance

YBaCuO and REBaCuO HTS for Applications

Pulsed Field Magnetization Properties of Bulk RE-Ba-Cu-O as Pole-Field Magnets for HTS Rotating Machines

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