Abstract: This study deals with a global method enabling the simulation for the detection of rotor cage faults in opérating three phase induction motors. This method is based on the coupled magnetic circuit theory and it presents an application regarding possibilities of predicting the performance in electrical machine. The system of differential equations describing the induction motor in presence of rotor faults is given. The machine inductances are calculated by means of the magnetic energy stored in the airgap. This task is performed by the use of the winding functions method and a previously developed airgap permeance analytical model. Finally, some simulation results illustrate the proposed global method in the case of the broken rotor bars faults of induction motors.