An equivalent internal circuit of the induction machine for advanced spectral analysis

The aim of this paper is to develop a method to validate an equivalent internal circuit of the three-phase squirrel-cage induction machine for advanced signal processing including fault diagnosis. The proposed method is based on the computation of the stator and rotor current spectra. An experimental setup for an 11-kW induction machine was developed in order to get numerical data for voltages and currents from the stator side. The comparison between the analytical computation, the simulation, and the experimental results, shows the model capability to reproduce the electromagnetic phenomena in the induction machine with mixed time and space harmonics. The proposed model can be used to design electrical fault detection devices with low cost and noninvasive sensors.