A Practical Superconducting DC Dynamo for Charging Conduction-Cooled HTS Magnet

Yujia Zhai, Chunran Mu (), Jinduo Wang, Litong Zhu, Tingkun Weng, Zhuo Li, Xingzheng Wu, Liufei Shen, Jianhua Liu and Qiuliang Wang
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Yujia Zhai: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Chunran Mu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Jinduo Wang: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Litong Zhu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Tingkun Weng: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Zhuo Li: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Xingzheng Wu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Liufei Shen: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Jianhua Liu: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Qiuliang Wang: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2024, vol. 17, issue 11, 1-12

Abstract: At present, HTS magnets cannot operate in the real closed-loop persistent current mode due to the existence of joint resistance, flux creep, and AC loss of the HTS tape. Instead of using a current source, HTS flux pumps are capable of injecting flux into closed HTS magnets without electrical contact. This paper presents a practical superconducting DC dynamo for charging a conduction-cooled HTS magnet system based on a flux-pumping technique. To minimize heat losses, the rotor is driven by a servo motor mounted outside the vacuum dewar by utilizing magnetic fluid dynamic sealing. Different parameters, such as air gap and rotating speed, have been tested to investigate the best pumping effect, and finally, it successfully powers a 27.3 mH HTS non-insulated double-pancake coil to the current of 54.2 A within 76 min. As a low-cost and compact substitute for the traditional current source, the realization of a contactless DC power supply can significantly improve the flexibility and mobility of the HTS magnet system and could be of great significance for the technological innovation of future HTS magnets used in offshore wind turbines, biomedical, aerospace, etc.

Keywords: HTS magnets; conduction cooled; contactless magnetizing technology; DC dynamo (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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