Analysis And Research On Electromagnetic Structure Of Toroidal Type HTS-Smes Magnet

As a result of the huge energy consumption in the world nowadays, finding and using new energy should be prioritized. Superconducting magnetic energy storage system has become a research focus for its large capacity and stability. As the most important part of energy system, superconducting magnet is divided into three fundamental types: solenoid magnets, toroidal magnets and hybrid magnets. With the rapid development of power industry, toroidal magnets which has large energy storage and can reach megajoule level capacity, has gained more and more attention and has been designed and researched. A certain leakage magnetic field and electromagnetic force will be produced on account of high superconducting magnet running current. Equipments around magnets, personal safety of staff, even magnet itself might be damaged because of leakage magnetic field and large electromagnetic force. The characteristics of complex structure of toroidal magnets makes a great influence on magnetic field and electromagnetic force. Therefore, searching the relationship of structure of the toroidal magnet and leakage magnetic field distribution and stress distribution is of great technical and economic significance.Firstly, this dissertation introduces the research background and significance, and then states the basic properties of superconductor, and composition of superconducting energy storage system. After that, overseas and domestic research status about toroidal magnets is briefly reviewed.Secondly, this dissertation gives the theoretical basis of analysis on magnetic field of a single toroidal magnet coil. The magnetic field distribution in one unit of coil and the overall model is analyzed in detail, all of which established a theoretical foundation for the subsequent magnetic field simulation. The finite element method and the ANSYS finite element analysis software are also introduced.Thirdly, in order to analyze the distribution of leakage field, toroidal magnets, which has four unit coils and can store 1MJ energy, is simulated in different structure parameter by using ANSYS. A concrete analysis has been accomplished in toroidal magnet structure, the selection of superconductive wire and tape, the establishment of magnet model, the generation of mesh, the calculation and upload of current density, and the calculation of leakage magnetic field under different structure parameter. According to the results of simulation, magnetic induction intensity distribution about magnets is analyzed, the relational regularity graph of leakage magnetic field in different radius and height is also given.Moreover, this dissertation analyzes the distribution of electromagnetic field and mechanical field by using sequential coupling analyzing method, the relationship between structure parameters and stress distribution of magnets are explored. The detailed process includes force analysis of magnets, selection of mechanical support structure material, rebuilding of magnet and support structure model, generation of mesh, the upload of electromagnetic file. Finally, it reaches the distribution of stress in different structure parameters. From the result of simulation, dangerous area of magnet is analyzed, the relationship between various radius and height parameters and stress distribution are given.Finally, magnets’ structure optimization analysis has been accomplished. By combining structural parameters with the minimum leakage and stress, some primary plans are obtained. Then, by simulating electromagnetic field and mechanical field, and by comparing the relationship between magnet structure parameters and leakage magnetic field and stress distribution, better plans and desired results are received.