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This paper proposes methods and algorithms for the estimation of induction motor equivalent circuit parameters, starting from the geometrical and electrical data generally available after an electromagnetic design. This part includes an approach for the skin effect determination in arbitrarily shaped rotor slots, based on the elementary layer method. In addition, a complete analytical development for the fundamental airgap flux density, including magnetic saturation phenomena and no-load characteristic determination, is reported. Finally, a comparison between the computed and measured values is provided and discussed for several induction motors.