Real-Time Extraction for Stator Interturn Fault Features in Induction Motor Drives Using Tracking Filters

This paper proposes a new method for real-time extraction of the second harmonic in instantaneous active power (IAP) and instantaneous reactive power (IRP). These components are caused by stator interturn faults in an induction motor drive operating under current closed-loop control. This method contributes to the detection of the stator interturn fault while maintaining a low computational load. Moreover, this method potentially facilitates the integration of a stator interturn fault diagnosis function into the drive inverter. The stator interturn fault features (second harmonics) in IAP and IRP are extracted using a combination of the time-domain transformations with a rotation matrix. Experimental tests verify that the proposed method accurately extracts the second harmonics in IAP and IRP under the simulated stator interturn fault conditions, with a high accuracy of 0.77<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> error compared to offline FFT analysis results.