전계를 이용한 팬케이크 권선으로 제작되는 마그넷의 임계전류 산정

Critical Current Estimation of HTS Magnets by using Field Dependent E-J Relation

  • 발행 : 2009.03.01

초록

The method to determine the operating current of HTS magnets needs to be different from that of LTS magnets. This paper presented estimation of the critical current of pancake windings. The pancake windings can be excited by a single power source or by multiple power sources. Critical currents were determined by using field dependent E-J relation. For the better estimation of the critical current, a new method to define the magnetic field of the HTS wire has been proposed. Calculated critical currents of pancake windings were compared with measured ones of the HTS BSCCO magnet consisting of 10 pancake windings. According to the test results, the estimated critical currents of pancake windings agreed well with that of measured ones. Effects of the single and multiple power source excitation on the critical currents have been also examined.

키워드

참고문헌

  1. M. Daumling and R. Flukiger, 'Factors determining the magnetic field generated by a solenoid made with a superconductor having critical current anisotropy,' Cryogenics, Vol. 35, pp. 867-780, 1995 https://doi.org/10.1016/0011-2275(95)96884-O
  2. J. Pitel, P. Kovac and I. Husek, 'Calculation of the critical currents of Bi(2223)/Ag tapes and coils with reduced anisotropy in $I_c(B)$ characteristics - effect of different proportional representations of the filaments oriented parallel and perpendicularly to the tape surface,' Physica C, vol. 300, pp. 130-140, 2000 https://doi.org/10.1016/S0921-4534(99)00623-1
  3. Y. Adanny, et aI., 'Calculated E-I characteristics of HTS pancakes and coil exposed to inhomogeneous magnetic fields,' Journal of Physics, Conference Series, vol. 43, pp. 1068-1071, 2006 https://doi.org/10.1088/1742-6596/43/1/261
  4. K. Lee et aI., 'Properties of an HTS Magnet With Pancake Windings Excited by Multiple Power Sources,' IEEE Trans. Appl. Supercond., vol. 18, no.2, pp. 1533-1536, 2008 https://doi.org/10.1109/TASC.2008.920539
  5. M. Kang et aI., 'Design method of a high field HTS magnet consisting of pancake windings having different current in each pancake windings,' IEEE Trans. Appl. Supercond., vol. 18. no. 2, pp.1537-1540, 2008 https://doi.org/10.1109/TASC.2008.920529
  6. M. Kasper, 'Shape Optimization by Evolution Strategy,' IEEE Trans. on Magnetics, vol. 28, no.2, pp. 1556-1559, 1992 https://doi.org/10.1109/20.123995
  7. T. Hayashi et aI., 'Numerical calculation of magnetization losses in single Bi-2223 tape with anisotropic transport properties by 2D-FEM directly analyzing the field distribution,' Physica C, vol. 412-414, no. 2, pp. 1129-1133, 2004 https://doi.org/10.1016/j.physc.2004.01.135