This paper deals with the stator winding faults monitoring in the vector controlled induction motor drives. Two control methods were taken for analysis, namely the direct field oriented control - DFOC and the direct torque control - DTC. In both control structures the induction motor is supplied form two-level voltage inverter with space vector modulation (SVM). In order to detect the early stage of the stator winding inter-turn short-circuits, the analysis of characteristic components of internal control signals of the DFOC and DTC-SVM structures is used for diagnostic purposes. Experimental results obtained from a specially prepared induction motor working under vector control are presented.