A construction of high temperature superconducting motor using YBCO bulk magnets

Itoh, Yoshitaka; Yanagi, Yousuke; Yoshikawa, Masaaki; Oka, Tetsuo; Harada, Shintaro; Sakakibara, T.; Yamada, Yuh; Mizutani, Uichiro

doi:10.1016/0921-4534(94)91249-1

Cited by 15 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have proposed a pulsed field magnetization ͑PFM͒ technique to magnetize simultaneously a series of SBMs installed in a device, without relying on a large-scale electromagnet, and thereby we constructed a superconducting dc motor. 7,8 The motor was successfully driven by magnetizing 20 YBCO bulk samples utilizing the PFM technique after cooling to 77 K. Until now, however, fundamental studies of the effect of a pulsed magnetic field on melt-processed YBCO bulk superconductors have been rather limited. 4,[9][10][11][12][13][14][15][16][17][18][19] The magnetic-flux distribution produced by the PFM has been studied in preceding papers, 4,9 which are hereafter referred to as ͑I͒.…”

Section: Introductionmentioning

confidence: 99%

Flux motion during pulsed field magnetization in Y–Ba–Cu–O superconducting bulk magnet

Itoh¹,

Yanagi²,

Mizutani

1997

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

We have studied the dynamical motion of magnetic-flux lines penetrating into a melt-processed Y–Ba–Cu–O bulk superconductor during pulsed field magnetization. Subsequent flux creep was investigated by measuring signals from three Hall sensors mounted at the center, periphery, and the midpoint on the top surface of the sample at 77 K. The penetration of the magnetic flux into the sample is quite sluggish as long as the applied field is low. However, the magnetic flux penetrates suddenly and moves rapidly in response to the changing external field during the ascending stage of the pulsed field, when the intensity exceeds 1.5–2 T. Furthermore, when the rise time of the pulsed field is very short, the local magnetization measured at the midpoint is found to oscillate with time, as soon as the sudden penetration of the magnetic flux takes place. The fast motion of the magnetic flux generates heat and increases the temperature of the sample. This effect appears as a reduction of the trapped flux, already in the descending stage of the pulsed field and it contributes to the suppression of the flux creep after the pulse. The creep is suppressed more when the applied field is large, and it diminishes most in the center of the sample.

show abstract

Section: Introductionmentioning

confidence: 99%

Flux motion during pulsed field magnetization in Y–Ba–Cu–O superconducting bulk magnet

Itoh¹,

Yanagi²,

Mizutani

1997

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Applied bulk superconductivity to electric machines attracts much attention because of high magnetic flux trapped by the relevant magnetization process [37][38][39]. The main goal is to develop a high-power-density motor/generator aimed for use in a rotating machine [44,49,50]. It would be superior to synchronous machines with conventional permanent magnets.…”

Section: Tokyo University Of Marine Science and Technologymentioning

confidence: 99%

“…The design and manufacture of the armature/magnetization coil must meet the requirements of field-pole bulks and the concept design of the rotor-armature structure [50,51]. The assembly and construction of the complete system, for example, a >10 kVA-HTS bulk generator prototype, along with test results, would be near-future milestones.…”

Section: Tokyo University Of Marine Science and Technologymentioning

confidence: 99%

High power density superconducting rotating machines—development status and technology roadmap

Haran

Kalsi

Arndt

et al. 2017

Supercond. Sci. Technol.

347

176

View full text Add to dashboard Cite

Superconducting technology applications in electric machines have long been pursued due to their significant advantages of higher efficiency and power density over conventional technology. However, in spite of many successful technology demonstrations, commercial adoption has been slow, presumably because the threshold for value versus cost and technology risk has not yet been crossed. One likely path for disruptive superconducting technology in commercial products could be in applications where its advantages become key enablers for systems which are not practical with conventional technology. To help systems engineers assess the viability of such future solutions, we present a technology roadmap for superconducting machines. The timeline considered was ten years to attain a Technology Readiness Level of 6+, with systems demonstrated in a relevant environment. Future projections, by definition, are based on the judgment of specialists, and can be subjective. Attempts have been made to obtain input from a broad set of organizations for an inclusive opinion. This document was generated

show abstract

“…Pulse magnetization is required to magnetize the superconductors. 15 Alternatively, self-excited designs have been built. Monolithic material was 5 cm cut, joined, and bonded to form hollow cylinders.…”

Section: Electric Motorsmentioning

confidence: 99%

Developing melt-textured YBCO

Habisreuther

Zeisberger

Litzkendorf

et al. 2000

JOM

View full text Add to dashboard Cite

Overview Melt-Textured SuperconductorsMelt-textured yttrium-barium-copperoxide is suitable for many applications. By testing demonstrators where these elements are used, it can be learned which material properties must be optimized for a specific application field. For example, critical-current density must be increased for use in electric motors. Mechanical properties are very important for trapped-field magnets. Homogeneous properties on large monoliths seem necessary for bearings in fly-wheel systems.

show abstract

A construction of high temperature superconducting motor using YBCO bulk magnets

Cited by 15 publications

References 1 publication

Flux motion during pulsed field magnetization in Y–Ba–Cu–O superconducting bulk magnet

Flux motion during pulsed field magnetization in Y–Ba–Cu–O superconducting bulk magnet

High power density superconducting rotating machines—development status and technology roadmap

Developing melt-textured YBCO

Contact Info

Product

Resources

About