Electromechanical Design of an MW Class Wave Energy Converter With an HTS Tubular Linear Generator

Jing, Hailian; Maki, Naoki; Ida, Tetsuya; Izumi, Mitsuru

doi:10.1109/tasc.2018.2810298

Cited by 13 publications

(2 citation statements)

References 8 publications

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“…This may represent the first use of an HTS magnet for a large-scale national accelerator facility. In fact, applications of HTS magnet are rapidly expanding beyond laboratory magnets to fusion [9][10][11] , high energy physics [12][13][14][15] , biochemistry [16][17][18][19][20][21] , biomedical diagnosis [22][23][24][25][26][27] , renewable energy [28][29][30][31] , electric propulsion [32][33][34][35] and more [36][37][38][39][40][41] .…”

Section: Introductionmentioning

confidence: 99%

“Thermal Eraser” to Mitigate Screening Current by Optimal Control on Spatial Temperature Distribution in a High Temperature Superconductor Magnet

Bang¹,

Kim²,

Lee³

et al. 2021

Preprint

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The so-called “screening current” in high temperature superconductor (HTS) is a well-known phenomenon that has detrimental effects on performance of an HTS magnet. To date, many research efforts have been devoted to suppressing screening current in an HTS magnet. Here we report a customized electric-heater, named “Thermal Eraser”, to mitigate the screening current. The key idea is to optimally control spatial temperature distribution in an HTS magnet using the customized heater and the consequent temperature-dependent local critical current of HTS wires of the magnet. To validate the idea, a Thermal Eraser was designed, constructed, and installed in an actual single-pancake HTS coil. And the Thermal Eraser plus test coil system was operated at temperatures ranging 7-40 K in our in-house conduction-cooling cryogenic facility. The feasibility of the Thermal Eraser was demonstrated in terms of two aspects: 1) creation of the designated spatial temperature distribution within the HTS test coil as designed; and 2) quantitative evaluation of its effectiveness to mitigate screening current using both experimental and numerical results. We confirmed that the screening current induced field in the test coil was reduced by 0.6 mT after activation of the Thermal Eraser, which implies 60% reduction of screening current in the HTS test coil. The results demonstrate that the Thermal Eraser is a viable option to effectively reduce the screening current in an HTS magnet.

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Section: Introductionmentioning

confidence: 99%

“Thermal Eraser” to Mitigate Screening Current by Optimal Control on Spatial Temperature Distribution in a High Temperature Superconductor Magnet

Bang¹,

Kim²,

Lee³

et al. 2021

Preprint

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“…The power density is limited by magnetic materials and silicon steel materials, and the overall conversion efficiency of the system is often low. With the rapid development and application of superconductor materials, motors containing such materials are being gradually applied to wave power take-off systems [10][11][12]. Previously, some scholars have used magnetic gears [13][14][15][16] for direct-drive wave power take-off system to enhance the speed of LPMG, which can improve energy conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Linear magnetic gear with HTS bulks for wave energy conversion

Liu

Zhang

Dong

2019

IET Renewable Power Generation

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This study proposes a linear magnetic gear (LMG). Unlike conventional LMGs, the proposed one purposely uses high-temperature superconducting (HTS) bulks replace permanent magnets (PMs). The high-speed mover of the magnetic gear is connected to the secondary of the linear permanent magnet generator (LPMG), which constitutes a direct-drive wave power system that converts wave energy into electrical energy. First, the LMG structure is presented according to the principle of magnetic field modulation, and the authors briefly analyzed the number of pole pairs of inner, outer, and ferromagnetic modulators. Second, they also established a finite element analysis model to analyze the performance of magnetic gear, including magnetic field distribution, radial air gap magnetic flux density, and force characteristic. An LMG with HTS bulks not only increased the radial air gap magnetic flux density but also improved the speed of LPMG. In conclusion, this experiment verifies the efficacy of direct-drive wave power takeoff system and effectively converts wave energy into electrical energy.

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Superconducting Linear Machines for Electrical Power Generation from the Oceanic Wave

Kiran

Farrok

Guo

2019

Advanced Linear Machines and Drive Systems

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Electromechanical Design of an MW Class Wave Energy Converter With an HTS Tubular Linear Generator

Cited by 13 publications

References 8 publications

“Thermal Eraser” to Mitigate Screening Current by Optimal Control on Spatial Temperature Distribution in a High Temperature Superconductor Magnet

“Thermal Eraser” to Mitigate Screening Current by Optimal Control on Spatial Temperature Distribution in a High Temperature Superconductor Magnet

Linear magnetic gear with HTS bulks for wave energy conversion

Superconducting Linear Machines for Electrical Power Generation from the Oceanic Wave

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