Non-invasive early detection methods of shorted turns in converter-fed induction motor. Part II

In this paper problem of the early induction motors stator faults (the short-circuits) detection and localization supplied from the frequency converter are presented. Tests were realized for different load torque and supply frequencies. For the monitoring stator winding condition method based on monitoring the spatial current vector is used. Attention was paid to changes that result in short-circuit a few winding turns in one phase of stator current spatial vector, such as maximum value, hodograph deformation, angular shift and spectral analysis of the stator current spatial vector module. To evaluate changes of current hodograph method based on principal components analysis PCA are used