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A new approach employing the circuit analysis theory instead of electromagnetic field theory is presented to calculate the rotor resistances and inductances of single-phase induction motors. The resistance and inductance parameters are obtained at positive sequence and negative sequence frequencies, respectively, with skin effect consideration. The rotor bar is divided into many thin-layers with their own parameters derived. The superposition principle is applied to obtain total bar losses and slot magnetic energy for different frequencies. For a given example, the resistance and inductance parameters for both positive sequence and negative sequence are obtained, which are verified by the finite element method.