PROBLEM TO BE SOLVED: To complete analysis and evaluation of total performance of electric system within a short period of time with a method of analyzing the performance of electric system including a motor and a control by utilizing an analysis model. SOLUTION: The number of flux linkages of motor is analyzed in regard to a discrete rotating angle and a discrete current value in which the rotating angle and current are respectively discretized with an adequate step under an FEM model as an analysis model. The discretization of the discrete rotating angle is conducted, when an absolute value of the differential value for the rotating angle in the number of flux linkages is large, in the step which is smaller than that when such absolute value is small. Accordingly, discretization of a plurality of discrete current values can be conducted, when the absolute value of the differential value for a current in the number of flux linkages is large, in the step which is smaller than that when the absolute value is small. Therefore, according to this method, a degree depending on the FEM model to calculate the number of flux linkages can be lowered than that of the prior art. As a result, the time required for analysis, evaluation and design of the electric system can be reduced easily.
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