It has been well known that a toroid is the inevitable shape for a high temperature superconducting (HTS) coil as a component of a large scale superconducting magnetic energy storage system (SMES) because it is the best option to minimize a magnetic field intensity applied perpendicularly to the HTS...
It has been well known that a toroid is the inevitable shape for a high temperature superconducting (HTS) coil as a component of a large scale superconducting magnetic energy storage system (SMES) because it is the best option to minimize a magnetic field intensity applied perpendicularly to the HTS wires. Even though a perfect toroid coil does not have a perpendicular magnetic field, for a practical toroid coil composed of many HTS pancake coils, some type of perpendicular magnetic field cannot be avoided, which is a major cause of degradation of the HTS wires. In order to suggest an optimum design solution for an HTS SMES system, we need an accurate, fast, and effective calculation for the magnetic field, mechanical stresses, and stored energy. As a calculation method for these criteria, a numerical calculation such as an finite element method (FEM) has usually been adopted. However, a 3-dimensional FEM can involve complicated calculation and can be relatively time consuming, which leads to very inefficient iterations for an optimal design process. In this paper, we suggested an intuitive and effective way to determine the maximum magnetic field intensity in the HTS coil by using an analytic and statistical calculation method. We were able to achieve a remarkable reduction of the calculation time by using this method. The calculation results using this method for sample model coils were compared with those obtained by conventional numerical method to verify the accuracy and availability of this proposed method. After the successful substitution of this calculation method for the proposed design program, a similar method of determining the maximum mechanical stress in the HTS coil will also be studied as a future work.
It has been well known that a toroid is the inevitable shape for a high temperature superconducting (HTS) coil as a component of a large scale superconducting magnetic energy storage system (SMES) because it is the best option to minimize a magnetic field intensity applied perpendicularly to the HTS wires. Even though a perfect toroid coil does not have a perpendicular magnetic field, for a practical toroid coil composed of many HTS pancake coils, some type of perpendicular magnetic field cannot be avoided, which is a major cause of degradation of the HTS wires. In order to suggest an optimum design solution for an HTS SMES system, we need an accurate, fast, and effective calculation for the magnetic field, mechanical stresses, and stored energy. As a calculation method for these criteria, a numerical calculation such as an finite element method (FEM) has usually been adopted. However, a 3-dimensional FEM can involve complicated calculation and can be relatively time consuming, which leads to very inefficient iterations for an optimal design process. In this paper, we suggested an intuitive and effective way to determine the maximum magnetic field intensity in the HTS coil by using an analytic and statistical calculation method. We were able to achieve a remarkable reduction of the calculation time by using this method. The calculation results using this method for sample model coils were compared with those obtained by conventional numerical method to verify the accuracy and availability of this proposed method. After the successful substitution of this calculation method for the proposed design program, a similar method of determining the maximum mechanical stress in the HTS coil will also be studied as a future work.
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문제 정의
Wilson’s book [5]. And the point of this paper is that we achieve a remarkable reduction of the calculation time by using this method.
This paper suggests a fast estimation of a perpendicular magnetic field in a toroid coil for a large scale SMES. The calculation suggested in this paper showed a remarkable reduction (99% of calculation time with 3-DFEM) of running time by using an analytic and statistical calculation.
제안 방법
In this paper, we suggest a fast estimation method to obtain the maximum radial component of the magnetic flux density of the HTS toroid type coil. We assumed that the toroid type SMES coil will be assembled with a set of single pancake HTS coils arranged as a toroid form, which is the typical shape of the HTS toroid type coil.
To compare with the perpendicular magnetic field according to the number of pancakes in the toroid calculated using the calculation method proposed in this paper and measured by FEM.
참고문헌 (5)
S. Kwak, S. Lee, W. S. Kim, J. K. Lee, C. Park, J. Bae, J. B. Song, H. Lee, K. Choi, K. Seong, H. Jung, and S. Y. Hahn, "Design of HTS Magnets for a 2.5 MJ SMES," IEEE Transactions on Applied Superconductivity, vol. 19, no. 3, pp. 1985-1988, 2009.
S. Kim, "Analysis of Electromagnetic Characteristics of Large Scale Superconducting Magnetic Energy Storage," M. S. Dissertation, Korea Polytechnic University, Gyeonggi-do, Korea, 2013.
K. P. Yi, J. S. Ro, S. Lee, J. K. Lee, K. C. Seong, K. Choi, H. K. Jung, and S. Y. Hahn, "A design methodology for toroid-type SMES using analytical andfinite element method," IEEE Transactions on Applied Superconductivity, vol. 23, no. 3, pp. 4900404, 2013.
S. Lee, "Calculation of Normal Fields to Superconducting Tape of Toroidal Type Winding With Circular Section," IEEE Transactions on Applied Superconductivity, vol. 20, no. 3, pp. 1888-1891, 2010.
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