Observation of the Current-Decay and Force-Variation of a Flux-Pumped HTS Magnet Subjected to Traveling Magnetic Fields
- PDF / 4,333,895 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 72 Downloads / 163 Views
ORIGINAL PAPER
Observation of the Current-Decay and Force-Variation of a Flux-Pumped HTS Magnet Subjected to Traveling Magnetic Fields Yuke Deng 1,2 & Chao Wang 3 & Jing Li 1 & Pengbo Zhou 1 & Kang Liu 1 & Tianyong Gong 1,2 & Hengbin Cui 3 & Xue Deng 3 & Guangtong Ma 1 Received: 1 April 2020 / Accepted: 7 May 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A variety of applications with high-temperature superconducting (HTS) magnet require the same characteristic which is the stable magnetic field generated by the persistent current flowing in the magnet. Regretfully, in the linear motor system of magnetic levitation transportation, HTS magnet will suffer from a current decay both internally and externally. On the one hand, joints loss represents the main cause internally. On the other hand, ac losses resulted from external ac circumstance can lead to the worse situation. To alleviate negative factors resulting in current decay, it is necessary to study the effects they will make. In this paper, in order to clarify the current-decay problem, a flux pump system based on transformer-rectifier principle was established for charging the no-insulation racetrack-coated superconductor coil, whose saturated current can be over 70% of the critical current. The variation of current, self-field, and electromagnetic forces of HTS magnet subjected to the traveling magnetic fields generated by a copperbased three-phase stator were observed experimentally. Our conclusion shows that, when the HTS magnet is placed above the threephase stator, the characteristics of current decay have a strong dependence upon the amplitude and frequency of stator current. Keywords HTS magnet . Flux pump . Traveling magnetic fields . Current decay
1 Introduction A marvelous promotion of applications with HTS magnets appears in a variety of fields, such as magnetic resonance imaging (MRI), nuclear magnetic resonance (NMR), and magnetic levitation transportation. Superconducting technology is mainly embodied in the field of magnetic levitation transportation as superconducting levitation and linear traction [1]. Linear motor is a no-contact linear traction device without
* Guangtong Ma [email protected] Pengbo Zhou [email protected] 1
Applied Superconductivity Laboratory, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
3
Chengdu Yunda Innovation Technology Group Co., Ltd, Chengdu, China
intermediate transmission mechanism. In recent years, with the maturity of superconducting industry, the superconducting linear motor has become a research highlight in the development of high-speed rail transportation [2, 3]. Compared with the conventional linear motor, the superconducting linear motor has the larger thrust density, wider working air gap, and higher traction power factor and efficiency [4, 5]. However, as the core component of superconducting linear
Data Loading...
