Enhancement of trapped field and total trapped flux on GdBaCuO bulk by the MMPSC+IMRA method

Fujishiro, Hiroyuki; Hiyama, T.; Naito, Tomoyuki; Yanagi, Yousuke; Itoh, Yoshitaka

doi:10.1088/0953-2048/22/9/095006

Cited by 22 publications

(22 citation statements)

References 13 publications

(16 reference statements)

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“…It has been experimentally proved that the multi-pulse technique can improve the trapped field of HTS bulks by PFM effectively. The multi-pulse techniques include successive pulsed-field application (SPA), iteratively magnetizing pulsed field method with reducing amplitude (IMRA), and multi-pulse technique with step-wise cooling (MPSC) [13], [14], [15], [16]. The increase of the trapped field by successive pulses is understood as a result of reducing temperature rise due to the existence of currents produced by previous pulses.…”

Section: Introductionmentioning

confidence: 99%

Simulation and experiments of stacks of high temperature superconducting coated conductors magnetized by pulsed field magnetization with multi-pulse technique

Zou

Zermeño

Baškys

et al. 2016

Supercond. Sci. Technol.

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High temperature superconducting (HTS) bulks or stacks of coated conductors (CCs) can be magnetized to become trapped field magnets (TFMs). The magnetic fields of such TFMs can break the limitation of conventional magnets (<2 T), so they show potential for improving the performance of many electrical applications that use permanent magnets like rotating machines. Towards practical or commercial use of TFMs, effective in situ magnetization is one of the key issues. The pulsed field magnetization (PFM) is among the most promising magnetization methods in virtue of its compactness, mobility and low cost. However, due to the heat generation during the magnetization, the trapped field and flux acquired by PFM usually cannot achieve the full potential of a sample (acquired by the field cooling or zero field cooling method). The multi-pulse technique was found to effectively improve the trapped field by PFM in practice. In this work, a systematic study on the PFM with successive pulses is presented. A 2D electromagnetic-thermal coupled model with comprehensive temperature dependent parameters is used to simulate a stack of CCs magnetized by successive magnetic pulses. An overall picture is built to show how the trapped field and flux evolve with different pulse sequences and the evolution patterns are analyzed. Based on the discussion, an operable magnetization strategy of PFM with successive pulses is suggested to provide more trapped field and flux. Finally, experimental results of a stack of CCs magnetized by typical pulse sequences are presented for demonstration.

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Section: Introductionmentioning

confidence: 99%

Simulation and experiments of stacks of high temperature superconducting coated conductors magnetized by pulsed field magnetization with multi-pulse technique

Zou

Zermeño

Baškys

et al. 2016

Supercond. Sci. Technol.

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“…Generally, the effect of PFM was evaluated in terms of the final trapped field strength around the superconducting bulk [7], [8]. The usual objective is for the trapped field to be as large as possible.…”

Section: B Simulation Schemementioning

confidence: 99%

Simulation of Pulse Field Magnetization of a Bulk Superconductor and Its Interaction With an Electromagnet

Yang

et al. 2015

IEEE Trans. Appl. Supercond.

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Pulse field magnetization (PFM) is viewed as an appropriate method to provide a strong trapped field in a superconductor. However, a large amount of heat is generated because of dynamic motion of magnetic flux during PFM, which will affect the trapped field and the corresponding magnetic force properties. In this paper, an electromagnetic simulation of the PFM coupling with heat transfer is conducted. The time evolution and the spatial distribution of the temperature and induced current in the superconductor are studied. The magnetic force between the magnetized bulk and an electromagnet is also simulated to show the influence of the PFM on the application of the bulk into a superconducting interface module. The simulation suggests that the initial temperature of the bulk has an important influence on the current density and heat distribution in the magnetized bulk. In addition, with the objective of a stable mechanism for docking and self-assembly of space module systems, the effect of pulse field magnitude and the temperature fluctuation on the interaction force characteristics are also analyzed and discussed.

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“…FCM is undoubtedly the best general method, which has given the highest value of 17.24 T [7]. However, limited by practical applications, FCM is expected to be replaced by PFM because of its inexpensive experimental setup and potential magnetizing abilities [8]. For the application of the superconducting interface module in space, it has to be studied which one of the two magnetization conditions is more appropriate to meet the demands of the self stability.…”

Section: Superconducting Interface Modules Considering Magnetizationmentioning

confidence: 99%

“…In PFM, the actuating current density was described by a half sinusoidal waveform shown in (8), and the interfacing current density still was given by the (7)…”

Section: A Modeling Frameworkmentioning

confidence: 99%

Simulation and Experiments of Quasi-Static Force Characteristics in a Superconducting Interface Module Configuration Applied in Self-Assembly of Space Module Systems

Yang

Jiao

et al. 2014

IEEE Trans. Appl. Supercond.

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Flux-pinned interaction between high temperature superconductor and applied field provides a new, nocontacting interfacing approach to positive docking and assembling of space module systems. A superconducting interface module configuration is presented in this paper, which consists of a bulk superconductor, an actuation magnet, and an interfacing magnet. The induced current and magnetic flux density in the superconducting interface module are simulated based on H formulation, and electromagnetic properties of the module subject to different magnetization conditions are demonstrated. Primary experiments are also carried out to understand the magnetization and quasi-static force properties. The measured data partly agree with the simulated results, indicating the valid usage of the H formulation method in the modeling of the superconducting interface module. Index Terms-Flux pinning, high temperature superconductor, simulation, superconducting device. 1051-8223 © 2013 IEEE

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Enhancement of trapped field and total trapped flux on GdBaCuO bulk by the MMPSC+IMRA method

Cited by 22 publications

References 13 publications

Simulation and experiments of stacks of high temperature superconducting coated conductors magnetized by pulsed field magnetization with multi-pulse technique

Simulation and experiments of stacks of high temperature superconducting coated conductors magnetized by pulsed field magnetization with multi-pulse technique

Simulation of Pulse Field Magnetization of a Bulk Superconductor and Its Interaction With an Electromagnet

Simulation and Experiments of Quasi-Static Force Characteristics in a Superconducting Interface Module Configuration Applied in Self-Assembly of Space Module Systems

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