Speaker
Description
The induction heater with DC high-temperature superconducting (HTS) magnetization coil is a promising device for aluminum, copper and brass extrusion billets. Compared with an energy efficiency of just some 50% for conventional technology and limitations in processing speed, the energy efficiency of the HTS DC induction heater increase to more than 80%. The HTS DC magnet with its refrigeration system is placed concentric with the middle iron-core limb. The magnet consists of three solenoid coils wound with YBCO produced by Shanghai Superconductor, and the critical current of the tape is 90A (77K, self-field). The inner and outer diameters of the YBCO magnet are Φ1960mm and Φ2009mm, respectively. The magnet is a cryogen free system cooled by two AL325 cryo-refrigerators, and the operating temperature is about 25K. The maximum operating current is 130A at 25K, and corresponding magnetic field in the middle of the billet is 0.5T.
