Finite-Element Analysis of Pulsed High-Field Magnets With Precise Thermal and Structural Calculations

The design of high-performance pulsed high-field magnets strongly depends on accurate thermal and structural analyses. In this article, a 2-D multi-physical simulation method for pulsed magnets based on the ANSYS is presented. The skin effect of the coil in a transient magnetic field and the magneto-resistance (MR) effect are considered using ANSYS-parameter design language (APDL). The induced voltage is calculated by the magnetic-penetration method to realize the transient field coupling between the coil and circuit. The MR effect is considered as an additional equivalent heat source. Contact pairs are used to simulate discontinuous boundary and axial compression. The simulated pulse waveform agrees well with the experimental results. Simulations show that the skin effect and MR will increase the maximum temperature by 40%. The contact state between layers in the axial direction is analyzed in detail, which increases the accuracy of stress calculation compared to the existing 1-D programs. The design accuracy of a 90 T magnet is improved effectively using the proposed method.