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Relaxed fault conditions for stator short-circuit fault isolation in induction motors
In this paper, a geometric analysis has been carried out for stator fault isolation in three-phase induction motors (IM). Specifically, stator short-circuit faults in IM are considered in this study. For the geometric analysis, the study departs from the IM model in the stator reference frame (dq-frame). Nonetheless, a single fault in the abc-frame is reflected as concurrent faults in the dq-frame, where the number of concurrent faults and disturbances (load torque) is equal to the number of state variables. Hence, isolating stator short-circuit faults cannot be achieved even by considering the full state available. Thus, relaxed fault conditions are given to isolate stator short-circuit faults in the abc-frame for IM. Two different perspectives are presented to achieve these objectives. Finally, observer-based fault diagnosis schemes are suggested for both conditions, and simulation results are shown to validate the ideas illustrated in this study. © 2012 IFAC.
Fault isolation; Geometric analysis; Induction motor; Short-circuit faults Electric fault currents; Geometry; Induction motors; Plant management; Stators; Timing circuits; Fault conditions; Fault diagnosis schemes; Fault isolation; Geometric analysis; Number of state; Short-circuit fault; Stator reference frame; Three phase induction motor; Fault detection
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