Waveform control pulse magnetization for HTS bulk magnet

Ida, Tetsuya; Shigeuchi, Koji; Okuda, Sayo; Watasaki, Masahiro; Izumi, Mitsuru

doi:10.1088/1742-6596/695/1/012009

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…Employing a suitable rise time and about four seconds of pulsed field duration, the HTS bulk traps a high magnetic flux density by single PFM with a waveform control made from active feedback of the Hall sensor voltage as a function of time (figure 22). During a single PFM application, the maximum trapped magnetic flux density exceeds 90% of the trapped field density obtained by FCM at liquid nitrogen temperature [48,49].…”

Section: Tokyo University Of Marine Science and Technologymentioning

confidence: 88%

“…It can suppress local heat generation by decreasing magnetic flux motion to limit the rate of rise in magnetic flux density per unit time. Thus, single-pulse magnetization increases trapped magnetic flux with the pulsed magnetic field using a suitable waveform as a function of time to minimize the magnetic flux motion [48]. The present waveform-controlled WCPM actively controls the magnitude of the pulse discharge, improving the trapped magnetic field property (see figure 22).…”

Section: Tokyo University Of Marine Science and Technologymentioning

confidence: 99%

“…In PFM, the discharge current to a pulsed copper armature coil gradually decreases due to self-induction if the electric discharge is interrupted while an electric charge remains stored in the capacitor [47]. The magnitude of the magnetization waveform is controlled for the active discharge interruption from the capacitor [48]. It can suppress local heat generation by decreasing magnetic flux motion to limit the rate of rise in magnetic flux density per unit time.…”

Section: Tokyo University Of Marine Science and Technologymentioning

confidence: 99%

“…Concluding remarks. In prior magnetizations, bulks were assembled in the machine as field poles on the rotor [48], necessitating the magnetization of the bulks after zero-field cooling. Now it is possible to magnetize the bulk cooled below T c by the momentary application of a large field, e.g.…”

Section: Tokyo University Of Marine Science and Technologymentioning

confidence: 99%

See 3 more Smart Citations

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

Haran

Kalsi

Arndt

et al. 2017

Supercond. Sci. Technol.

341

155

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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

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Section: Tokyo University Of Marine Science and Technologymentioning

confidence: 88%

Section: Tokyo University Of Marine Science and Technologymentioning

confidence: 99%

Section: Tokyo University Of Marine Science and Technologymentioning

confidence: 99%

Section: Tokyo University Of Marine Science and Technologymentioning

confidence: 99%

See 2 more Smart Citations

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

Haran

Kalsi

Arndt

et al. 2017

Supercond. Sci. Technol.

341

155

View full text Add to dashboard Cite

show abstract

“…In the past years, several methods such as IMRA (iteratively magnetizing pulsed-field operation with reducing amplitudes), MPSC (multi-pulse technique with a stepwise cooling), MMPSC (modified MPSC), and so on [14][15][16][17], in which pulsed fields are applied several times with changing an amplitude of magnetic field and temperature, have been employed. Recently, new methods have been developed such as a split coil method and long-pulse method, and so on [18][19][20][21][22]. In the long-pulse method, the bulk is exposed to a magnetic flux for a long time by extending the pulse width.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of trapped field of REBCO bulk in a desktop-type magnet system

Yokoyama

Oka

2019

Eng. Res. Express

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We developed a desktop-type bulk magnet system using a Stirling refrigerator and used it to study how to improve the trapped field by pulsed field magnetization (PFM). Although PFM has the advantage that the bulk is activated in a few seconds using an ordinary inexpensive equipment, the amplitude of a trapped field is low as compared with the maximum performance of the material. This paper aims to improve the trapped field by changing the size of soft-iron yoke, which are generally used to extend the pulse width. When a f60-mm GdBCO bulk was magnetized using f64-mm and f80-mm yokes, the maximum flux density and total magnetic flux of large yoke were 13% and 23% higher than those of small one, respectively. Moreover, improvement of trapped field by multi PFM was investigated. When a magnetic field of 5.8 T was applied twice, the maximum trapped field of 1.46 T and the total magnetic flux of 1.86 mWb were achieved.

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