Reliability of the Park’s Vector method in induction motor drives fault diagnosis-Case of IGBT open circuit fault and rotor fault

Variable speed drives of induction motors have increased the use of this type in different industrial fields. Unfortunately, this association can become problematic in the case of a simultaneous fault: an IGBT open circuit fault of one of the inverter arms and a broken rotor bar fault in the induction motor. Among the conventional diagnostic methods, the Park’s vector approach is a very efficient method to locate the faulty IGBT in an inverter. Also, it is very reliable in monitoring the severity of the rotor fault, provided that the induction motor is fed directly from the grid. The aim of this paper is to study the reliability of this method in the case of a simultaneous fault. To this end, several experimental tests are performed to study the performance of this method when the motor is fed by an inverter, in the case of both an IGBT open circuit fault and a broken rotor bar fault.