Methods for Increasing the Saturation Current and Charging Speed of a Rotary HTS Flux-Pump to Charge the Field Coil of a Synchronous Motor

• Published in: IEEE transactions on applied superconductivity Vol. 28; no. 3; pp. 1 - 5
• Main Authors: Jeon, Haeryong, Yoon, Yong Soo, Lee, Jeyull, Han, Seunghak, Kim, Ji Hyung, Hyeon, Chang Ju, Kim, Ho Min, Park, Dongkeun, Chung, Yoon Do, Ko, Tae Kuk
• Format: Journal Article
• Language: English
• Published: IEEE 01.04.2018
• Subjects: Couplings; Flux-pump; High-temperature superconductors; Iron; Magnetic flux; Permanent magnets; Resistance; rotary HTS flux-pump; Superconducting magnets; synchronous motor
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2018.2793869

The rotary flux-pump using HTS tape has been studied for superconducting rotating machinery application. The charging speed and saturation current of the rotary HTS flux-pump is closely related to magnetic flux linkage passing through the HTS tape. To analyze charging parameters that effect pumping rate and saturation current of the flux-pump, methods of changing the rotating speed, shape of permanent magnet, width of HTS tape, and magnetic flux intensity have been investigated in previous studies [1]- [3]. In this paper, we have tried to test three cases to investigate the pumping rate and saturation current: 1) two different background materials, iron and Bakelite, were used to compare the magnetic flux linkage reinforcement; 2) two HTS tapes were overlapped to extend the magnetic flux linkage area, and each HTS tape was connected to an HTS coil; and 3) the parallel joint was conducted between the flux-pump and the HTS coil to compose a closed loop for persistent current mode. In order to measure the charging speed and pumping rate, a Hall sensor was installed at the center of the HTS coil.