Research On Theory And Practice Of Analysis And Design Of Pulsed High Field Magnets

With the progress of science and technology, High Magnetic Field (HMF) becomes one of the most important tools for many scientific researches. Differing in the pulse width, HMF can be classified as steady-state one and pulsed one, which are generated by steady-state magnet and pulsed magnet, respectively. As the latter one is relatively easier for manufacturing, operating and maintaining, it is much more expendable, and can be used at the field levels closed to the limit where the coil is destroyed to obtain the highest magnetic field. Accordingly, Pulsed High Magnetic Field (PHMF)has been widely used in physics, chemistry, life sciences and so on. This dissertation is a comprehensive study on the analysis, design, manufacture and testing technique of pulsed magnets. The emphasis is focused on the calculation of the basic parameters, and the distribution of temperature field and stress field in magnets. In discharging calculation, both magneto-resistance and skin effect are taken into account. For stress simulation, the total strain theory and the iteration method are used to calculate all components of the stress. The thickness of the reinforcing layers is determined by design optimization. This distributes the stress evenly and makes best use of the strength of material. For reinforcement, the isotropic materials are investigated that they impress the stress distribution. The winding, impregnating, assembly processing and testing techniques for the coil and magnets are presented. The primary experimental results of the tested magnets show a good agreement with the calculated ones. Based on the study mentioned above, a Pulsed Magnet Design Software (PMDS) package is developed using Visual Basic 6.0. The package includes electro-magnetic field analysis, thermal analysis and structure analysis with functional pre-and post-process. The interface of the package is user-friendly and easy to interchange. And the database is linked with Excel and AUTOCAD. All these make self-developed PMDS flexible, updatable, applicable and efficient. For comparison, the finite element software ANSYS is used for the discharge and stress calculation of pulsed magnets. The result obtained from ANSYS agrees well with that from PMDS. The performance of the two sotware packages are also described.