A brief overview of the current chapter reveals the attempts to understand the fundamentals of fault occurrence and the way how fault affects the motor timedomain behavior. The attempts were totally devoted to explain the theoretical fault basis and consequently address the most significant time-domain variations by means of which a fault might probably be detected. Nevertheless, not all faults introduce a specifically detectable behavior, at least in a time domain. A step-bystep laboratory-scale implementation of various types of faults, along with the required details, was provided. By means of this knowledge, a simple but very useful setup of fault diagnosis based on which one can study different fault aspects is indeed achieved.

Chapter Contents:

• 3.1 Introduction
• 3.2 Broken bar/end-ring fault in induction motors
• 3.2.1 Time-domain behavior of induction motors with broken bar/end-ring faults
• 3.3 Eccentric/misaligned and bearing faults in induction motors
• 3.3.1 Misalignment inclined rotor
• 3.3.2 Theoretical analysis of eccentric induction motor
• 3.3.3 Bearing faults in induction motor
• 3.4 Short-circuit fault in induction motors
• 3.5 Laboratory-sale implementation of induction motor faults
• 3.5.1 Three-phase induction motor
• 3.5.2 Autotransformer
• 3.5.3 Drive
• 3.5.4 Motor load
• 3.5.4.1 DC machines
• 3.5.4.2 AC machines controlled by a drive
• 3.5.4.3 Advanced programable dynamometers
• 3.5.5 Implementation of broken bar fault
• 3.5.6 Implementation of eccentricity fault
• 3.5.7 Implementation of interturn short-circuit fault
• 3.5.8 Signals and sensors
• 3.5.8.1 Voltage
• 3.5.8.2 Current
• 3.5.8.3 Torque
• 3.5.8.4 Speed
• 3.5.8.5 Flux
• 3.5.8.6 Vibration
• 3.5.8.7 Temperature
• 3.5.9 Data acquisition
• 3.5.9.1 MATLAB® code for an AdvanTech device
• 3.5.10 Overall scheme of the conventional cabled diagnosis system implementation
• 3.5.11 Wireless condition monitoring setup
• References

Inspec keywords: induction motors; fault diagnosis

Other keywords: fault diagnosis; motor time-domain behavior; theoretical fault basis; step-by-step laboratory-scale implementation; induction motor faults

Subjects: Asynchronous machines