Design Study of a 10-kW Fully Superconducting Synchronous Generator

Abstract

In this paper, a 10-kW/150-r/min fully superconducting synchronous generator was designed and sent for manufacturing, which installs high temperature superconducting coils in both the stator and the rotor. It has a basic structure of eight poles and nine slots. The concentrated winding was adopted, and there are 16 field coils and 18 armature coils wound by using 5-mmwide YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> (YBCO) tapes. The total tape consumption is around 2.0 km. Iron cores assembled by silicon-steel sheets will be installed in both the stator and the rotor. The peak gap field of 0.87 T can be achieved with a 42-A excitation current in field coils. The armature electric loading can reach 400 A/cm at the rated output. The present machine is designed to be cooled by using liquid nitrogen. The cryogenic structure can be divided into two parts: the conduction-cooled rotating part for field coils, and the immersion-cooled static part for armature coils. Both parts share the same vacuum chamber. A novel thermal insulated torque coupling will be installed to link the cold rotor and the warm shaft. The ac loss of armature coils was studied by H-formulation and it is within a reasonable range.