Squirrel cage induction motors have been frequently used in industrial applications due to their robustness. However, many faults can occur in these machines. This paper presents a new approach in the diagnosis of these induction motors. It is based on the spectrum analysis of the dispersion magnetic field (DMF) signal. For the simulation, we used a model made with the Matlab/Simulink tool. The results have been compared with experimental data through a bench test which are found to be very encouraging.

induction motor, broken bar, spectrum, magnetic field, diagnostic.