Design of a HTS Magnet With Iron Core for DC Induction Heater

This paper presents an electromagnetic design of a HTS magnet with iron core for DC induction heater. The heater is designed for aluminium billets with diameter of 60 mm and length less than 500 mm. The magnet is designed to generate 0.5 T DC magnetic fields in its air gap. The coil is wound with YBCO tapes produced by AMSC, and its operating temperature is 50 K. A numerical model is proposed to get an optimal design. The model couples MATLAB code and FEM model and considers the nonlinearity of iron core and the field dependence of tape´s Jc. The FEM model is built from commercial software. It can analyze the electromagnetic characteristics of magnet with complex geometry easily. The MATLAB code is used to analyse results from the FEM model, update the design variables to get an optimal solution. Finally, the specifications of design results are shown. The accuracy of the FEM model is the key of the optimization process. A magnet by cooper wires is built to validate the FEM model. Its iron core has same dimension as the designed HTS one. The data from FEM model and experiment show a good agreement.