A Pole Pair Segment of Oil-cooling Air-Core Stator for a 2 MW Direct-Drive High Temperature Superconducting Wind Power Generator

A 2 MW direct-drive (DD) high temperature superconducting (HTS) wind power generator with HTS wires in the rotor field windings and copper transposed conductor in the stator coils was explored for the wind turbine application in this study. An oil-cooling air-core stator with non-magnetic teeth of the 2 MW DD HTS generator was designed because the high flux density generated by the HTS wires wound result in larger dissipation in iron teeth, and the process of that could be summarized as follows. First, a 2 MW DD HTS wind power generator was designed, and the electromagnetic (EM), loss, EM force, and insulation of the DD HTS generator were analyzed and developed, respectively. Second, the thermal and mechanical of the one pole pair oil-cooling air-gap armature was analyzed by the finite element analysis. Then, a pole pair segment of the oil-cooling air-core stator with the same structure as the 2 MW generator was designed and manufactured to identify potential challenges, obtain practical knowledge before production, and then reduce the development risk of the 2 MW DD HTS generator. Furthermore, a test system with converter, oil-cooling system, and data acquisition equipment was developed simultaneously to test the temperature distribution of the slotless stator. The performance test results show that the maximum temperature rise of the one pole pair oil-cooling stator under rated conditions is about 81.4 K, which satisfies the design requirements of the 2 MW DD HTS generator.