Feature signal extraction of inter-turn short circuit fault in stator windings of induction motors

This paper reviews briefly the typical methods to extract the feature signal of the inter-turn short circuit fault in the stator windings of induction motors, and points out that the phase difference of the stator three-phase winding current is more preferable than the others, as the fault feature signal. Moreover, a novel feature signal of the inter-turn short circuit fault is derived, and the corresponding extraction scheme, i.e., the voltage-current cross-correlation approach which is based on the cross-correlations of the stator three-phase voltages and currents, is presented in this paper. The proposed scheme is immune from the asymmetry of the three-phase power voltage sources, and thus superior to the other methods. The validity and effectiveness has been demonstrated by a series of experimental results.