Design Study of 500kW Fully Superconducting Synchronous Motor

K.Yun, K. Tamura, M. Iwakuma, S. Miura, S. Sato, K. Yoshida, A. Tomioka, M. Konno, T. Izumi

The optimum structure of a 500 kW-300 rpm fully superconducting motor was studied with Re1Ba2Cu3O7- (Re: Rare Earth, Y, Gd, Eu, REBCO) superconducting tapes. The ac loss and critical current properties of recently developed REBCO tapes were actually investigated and adopted to the design and analysis. Setting the operating temperature and the magnitude of magnetic field at the gap as a parameter, various kinds of 500 kW fully superconducting motors were designed and the motor properties in each case were evaluated by numerical simulation with a two-dimensional analysis software on the market. The motor size, ac loss in the windings, iron loss and efficiency, length of required REBCO tapes and so on were evaluated and the dependences of these parameters on T and Bg were demonstrated. The ac loss induced in the armature windings was reduced by our original technique, which is composed of scribing into a multifilamentary structure and special winding of the tapes. As a result, the efficiency of the motor in the optimum case attains to 97 % in the supposition that the REBCO tape is scribed into a 10-filament structure.