Time-Domain based Diagnosis of Stator Incipient Faults in DTC Driven Induction Motors using External ElectroMagnetic Signatures

This study proposes a real-time, in-service nonintrusive condition monitoring (CM) of induction motor (IM) stator’s turn-to-turn faults (TTF) in vector controlled drive systems. A time-domain based signal processing technique, mathematical morphology (Mat-Morph), is adopted for CM based on the radiated electromagnetic (EM) field from the IM. The vector control technique implemented to drive the IM is the direct torque control (DTC). The proposed CM technique was examined by co-simulation and experimentally. In the co-simulation, a detailed finite element (FE) model of the asynchronous motor was build and interactively coupled to the power electronic inverter (PEI), DTC and the CM logic. Experimentally, the radiated EM field was captured via loop antenna and transmitted to the control board.