Control the Output of an HTS Dynamo With a DC Background Field

Xu, Hang; Wang, Wei; Yang, Chao; Wu, Chenghuai; Wei, Jiafu; Long, Run; Yang, Zhenxuan; Xiong, Chenling

doi:10.1109/tasc.2022.3166121

Cited by 9 publications

(2 citation statements)

References 41 publications

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“…With a DC bias of −1 A, the flux pump outputs a negative voltage, which can reduce the charging current to the load. Therefore, for the closed-loop current control system of HTS coil [26], a negative current bias can be used to adjust the flux pump output voltage to control the magnitude of the charging current, which is more effective in regulating the output.…”

Section: Biasmentioning

confidence: 99%

“…Recently, HTS flux pumps have received a lot of attention, such as transformer-rectifier flux pumps [13][14][15][16][17] and traveling wave flux pumps [18]. At present, there are several types of travelling wave flux pumps, mainly including thermally actuated flux pumps [19][20][21], HTS dynamo flux pumps [22][23][24][25][26][27], linear-motor type flux pumps [28][29][30][31], pulsetype flux pumps [32,33] and linear flux pumps [34,35]. Increasing the charging current is a major task in flux pump research.…”

Section: Introductionmentioning

confidence: 99%

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Miniaturized HTS linear flux pump with a charging capability of 120 A

Chen

et al. 2023

Supercond. Sci. Technol.

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Owing to the presence of joint resistance and flux creep, high-temperature superconducting (HTS) coils without a power supply inevitably suffer from current decay. A flux pump is a voltage supply that requires connections with smaller footprints and a lower heat load than traditional current leads. In this study, we explain the principle of the upper limit for the output current of the traveling wave flux pumps. Based on this principle, a miniaturized linear flux pump device was developed. With narrow and misaligned iron teeth, elaborate 3D geometry of the iron pieces, and optimized driving current waveform, the miniaturized flux pump can support more than 120 A output current with only a 10 mm wide HTS tape and a compact size of 4.6 × 4.6 × 3.4 cm. Our experimental results show that the critical current of the HTS tape has a significant effect on the flux pump output. An HTS tape with a larger critical current supports a higher maximum transport current, whereas an HTS tape with a smaller critical current requires less applied current for positive output. Finally, excitation tests on HTS coils were performed. Charge/active discharge and field supplement experiments were done on a maglev HTS racetrack coil of 0.4 H, where charging/field supplement capbility of the miniaturized flux pump were demonstrated up to 46.8 A (close to the critical current of the coil). It has also been proved that the flux pump can work together with an external power supply with persistent current switch. The miniaturized flux pump can also independently charge an HTS coil of 60 μH to 91.6 A, which is the critical current of the coil at a low voltage criterion.

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Section: Biasmentioning

confidence: 99%