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A rotor model was fabricated to estimate the performance of the 70 MW class superconducting generator. The normal propagation velocity and quench energy for the rotor model in the rotational field are measured at various rotating speeds. An analytical model is proposed in order to explain the experimental data. In the calculation, the heat transfer and the temperature rise of liquid helium in the rotational field are considered. The calculated results are compared with the experimental data, and these agree well. Therefore it becomes possible to precisely design field windings of superconducting generator.