Abstract
The heating process of aluminum billets requires controllable temperature distributions and high efficiency. Comparedwith conventional ac induction heaters, the high temperature superconductor (HTS) dc induction heater has advantages ofenergy saving and better heating quality. In this paper, a HTS magnet is designed to achieve controllable temperaturedistribution for dc induction heater. A C-shaped iron yoke is used to separate HTS coils and billets. An aluminum billetis rotated in the air gap of the C-shaped magnet. Magnetic field distribution can be changed through adjusting width ofthe air gap. Therefore, the temperature gradient in axial direction is controllable. A dc induction heater prototypeusing this design is fabricated and its heating characteristics are tested. A numerical model is built to simulateheating process and temperature distributions of aluminum billet. Various uniform and gradient temperature distributionsof a billet are measured and compared with numerical results.
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