Fault analysis of current-controlled PWM-inverter fed induction-motor drives

In this paper, the fault-tolerance capability of IM-drive is studied. The discussion on the fault-tolerance of IM drives in the literature has mostly been on the conceptual level without any detailed analysis. Most of studies are only achieved experimentally. This paper provides an analytical tool to quickly analyze and predict the performance under fault conditions. Also, most of the presented results were machine specific and not general enough to be applicable as an evaluation tool. So, this paper will present a generalized method for predicting the post-fault performance of IM-drives after identifying the various faults that can occur. The fault analysis for IM in the motoring mode will be presented in this paper. The paper includes an analysis for different classifications of drive faults. The faults in an IM-drive -that will be studied- can be broadly classified as: machine fault, (i.e., one of stator windings is open or short, multiple phase open or short, bearings, and rotor bar is broken) and inverter-converter faults (i.e., phase switch open or short, multiple phase fault, and DC-link voltage drop). Briefly, a general-purpose software package for variety of IM-drive faults -is introduced. This package is very important in IM-fault diagnosis and detection using artificial intelligent techniques, wavelet and signal processing.