ABSTRACT
This chapter presents a review of the various condition monitoring techniques of mechanical faults in electrical machines. It discusses their strengths, their limitations, and how they can fail. The chapter encompasses several vital topics such as structure of induction motors, the various types of defects in induction motors, and the condition monitoring techniques, namely vibration analysis, the acoustic emission (AE) method, thermal monitoring, noise monitoring, chemical analysis, and electric current monitoring that are used to diagnose induction motors' defects. It provides a general description of an induction motor. The chapter describes the various faults in the induction motors based on electrical and mechanical defects. It also provides a discussion on the various sensor-based condition monitoring and fault-diagnosis techniques. Motor condition monitoring techniques can mainly be classified into two categories, namely invasive and noninvasive techniques. While invasive techniques are basic and reliable and directly in the structures concerned, they are difficult to implement and have a high cost.
