Contents I. Introduction
The induction motor is one of the single most common electromechanical energy conversion devices. It is widely used in domestic, commercial, and industrial motion control devices and systems. An induction motor is considered inherently reliable due to its robust and relatively simple design [1], [2]. However, it faces various stresses during operating conditions. These stresses might lead to many modes of failures. Hence, the condition monitoring becomes necessary in order to avoid catastrophic failures [3]–[5]. Intensive research has been conducted to develop and implement reliable techniques for fault diagnosis in induction motors. In general, most of the conducted research concentrates on faults in three major components of any induction motor, which are stator windings, rotor windings/bars, and bearings. The research [6] conducted by the IEEE and the Electrical Power Research Institute showed stator faults to be responsible for 37% of total failures in induction motors. These faults are usually related to insulation failures. In common practice, they are generally known as phase-to-ground or phase-to-phase faults. Actually these faults start as undetected turn-to-turn faults that finally grow and cumulate into major ones [7].
