Comparison of models of faulty induction motors: Performances and applications

• Published in: 2007 IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives pp. 132 - 137
• Main Authors: Sprooten, J., Gyselinck, J., Maun, J.-C.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.09.2007
• Subjects: Bars; Circuit faults; Equations; Fault diagnosis; Induction motors; Mathematical model; Permeability; Rotors; Stator cores; Stator windings
• DOI: 10.1109/DEMPED.2007.4393083
• ISBN: 1424410614; 9781424410613

This paper proposes a comparison of several circuit models of induction motors with broken bars in terms of representation of the phenomena, identifiability of its parameters as well as computing time. Such a comparison is rare as many papers focus on the presentation of new models. The three models studied in this paper are based on electrical circuit equations obtained using a common set of hypotheses which is important to reach the objectives. The different models are totally equivalent in healthy operations. A d-q stator transformation is used for the implementation of Model 1, a asymmetrical d-q rotor transformation is then added in the case of Model 2 and the application of the theorem of superposition leads to Model 3. Model 1 gives quite accurate results but requires extensive computing time and a precise knowledge of the rotor parameters. Equivalent performances are obtained with Model 2 but with a much lower computing time. The drawback is that the value of the d and q rotor resistances and inductances need to be numerically computed as they are functions of the slip. Finally Model 3 reaches less accurate results for high fault magnitude but in a low computing time and with few parameter knowledge as well as a good interpretation of the faulty machine behaviour. The three presented models cover then the complete range of applications, i.e. from the faulty machine test platform to the on-line diagnosis of machines.