The Electromagnetic Optimization Of Superconducting Magnet

Recently with the development of superconducting magnet technology, superconducting magnet is widely used in electrical region such as superconducting motor, superconducting transformer, superconducting cable, SFCL (superconducting fault current limiter), SMES (superconducting magnetic energy system) and so on. Comparing with the common magnet, the superconducting magnet is more economical and applied. And sometimes it is unique in the special condition. Because of its unique superiority, a lot of designing and fabricating work about it is developed all over the world.Firstly, the electromagnetic theory and the FEA software ANSYS which are applied in the design of superconducting magnet are introduced. Then the author demonstrates ANSYS is responsible when it is used in electromagnetic analysis.Secondly, the author demonstrates that the new superconducting material MgB2 can be used well in superconducting magnet. Combined the Simulated Annealing Algorithm and GA with the optimization tools of ANSYS, the author finished the optimal design of 35kJ SMES made by MgB2, and get a solenoid models of new type.Finally, SMES based on single-solenoid structure produces an undesirable fringe magnetic field, which limits the application of SMES. The paper introduces several magnetic field shielding methods, and analyzes the connection between the parameters and magnetic performance. Considering the demands of engineering, the author finished the optimal design of two-solenoids, four-solenoids and six-solenoids, with two difference optimal aims.The traditional method of magnet design which just depends on basal electromagnetic theory is not only complicated but also not precise. The numerical calculation method using ANSYS which is introduced in this paper makes the design more quickly and reliably. In conclusion the numerical calculation method which is used in the design of SMES coil is more simple, precise and feasible.