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A triple-cage circuit of a deep-bar induction motor is numerically identified in the time domain. The parameters are estimated either in the transient state or in the steady state by using a curve-fitting technique. The data used for estimation were obtained from finite-element analysis and measurements using a 37 kW induction motor. The accurate parameters allow the circuit model to well represent the operating motor or predict the performance of the motor. The goodness and limitations of the method are also discussed.