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Superconducting generators (SCG's) are considered to have high tolerance for harmonic currents. To confirm the effects, some experiments on characteristics of a slow response excitation type SCG for harmonic armature currents were carried out by use of a real-time power system simulator. Furthermore, to analyze the results, analytical expressions on the eddy currents of the slow response type SCG were derived based on two-dimensional electromagnetic analysis. The expressions give simple relation between the eddy currents and the SCG's structural parameters such as radiuses and electric conductivity of damper cylinders. This paper describes the results of the experiments and some discussion on relation between harmonic current absorption and structural parameters of SCG's.