Open-circuit fault diagnosis in three-phase induction motor using model-based technique

摘要

The presence of an open-circuit fault subjects a three-phase induction motor toseverely unbalanced voltages that may damage the stator windings consecutively causingtotal shutdown of systems. Unplanned downtime is very costly. Therefore, fault diagnosisis essential for making a predictive plan for maintenance and saving the required time andcost. This paper presents a model-based diagnosis technique for diagnosing an open-circuitfault in any phase of a three-phase induction motor. The proposed strategy requires onlycurrent signals from the faulty machine to compare them with the healthy currents from aninduction motor model. Then the errors of comparison are used as an objective function fora genetic algorithm that estimates the parameters of a healthy model, which they employedto identify and localize the fault. The simulation results illustrate the behaviours of basicparameters (stator and rotor resistances, self-inductances, and mutual inductance) and thenumber of stator winding turn parameters with respect to the location of an open-circuitfault. The results confirm that the number of stator winding turns are the useful parametersand can be utilized as an identifier for an open-circuit fault. The originality of this work isin extracting fault diagnosis features from the variations of the number of stator windingturns.