DocumentCode :
66161
Title :
Numerical Analysis on Characteristic Resistance of No-Insulation and Partial-Insulation NbTi Solenoids
Author :
Dong Gyu Yang ; Seungyong Hahn ; Youngjae Kim ; Yoon Hyuck Choi ; Hyun-Jin Shin ; Haigun Lee
Author_Institution :
Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea
Volume :
25
Issue :
3
fYear :
2015
fDate :
Jun-15
Firstpage :
1
Lastpage :
5
Abstract :
This paper presents a numerical approach for calculation of the characteristic resistance, i.e., RC, of no-insulation (NI) and partial-insulation (PI) low-temperature superconductor solenoid coils, based on a contact resistance matrix model implementing “Hertzian contact.” The proposed method was applied to both NI and PI NbTi solenoid coils, for which test results have been reported. To consider the Hertzian contact effect, the stresses within the coil were quantitatively identified using a force balance equation. The stresses calculated in the axial and radial directions were 104 and 16 MPa, respectively, which consequently enabled estimation of the RC values of 36.2 and 203 μΩ for the NI and PI solenoid coils, respectively. The RC ratio of PI to NI coil was 5.6, implying that the estimated charge/discharge delay time of the NI coil was 5.6 times larger than that of the PI coil. The simulated RC ratio of PI to NI coil was in reasonable agreement with the experimental value, demonstrating the validity of the proposed approach in this paper.
Keywords :
contact resistance; matrix algebra; niobium compounds; solenoids; superconducting magnets; Hertzian contact effect; NbTi; axial directions; characteristic resistance; charge-discharge delay time; contact resistance matrix model; force balance equation; low-temperature superconductor solenoid coils; no-insulation solenoids; numerical analysis; partial-insulation solenoids; pressure 104 MPa; pressure 16 MPa; radial directions; resistance 203 muohm; resistance 36.2 muohm; Coils; Contact resistance; Nickel; Solenoids; Stress; Superconducting magnets; Windings; Characteristic resistance; Hertzian contact; no-insulation; partial-insulation; solenoid coil;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2014.2375952
Filename :
6971151
Link To Document :
بازگشت