Modeling and Diagnosing Eccentricity Fault Using Three-dimensional Magnetic Equivalent Circuit Model of Three-phase Squirrel-cage Induction Motor

Abstract

This article presents the three-dimensional modeling of an induction motor using a magnetic equivalent circuit. The main goal of introducing the three-dimensional model is to include axial fluxes in the machine equations. Furthermore, enhancement of the precision of teeth flux estimation and air-gap permeances, as the most important and dominant factors, is another achievement of this model compared to that of the two-dimensional model. This increases the accuracy of the estimated torque. Although it is possible to include the impact of the bar skew in the two-dimensional modeling using a magnetic equivalent circuit, this can be included more precisely in the three-dimensional model due to the three-dimensional nature of the bar skew. Therefore, the three-dimensional model as an efficient method with rapid computations and suitable precision is used for modeling various types of eccentricity. It is shown that the three-dimensional model results are closer to the experimental results compared to that of the two-dimensional model. This confirms the merit of the three-dimensional model. Also, this method can be a proper substitution to the finite-element method in modeling a machine under fault and fault diagnosis.

Keywords:

• eccentricity fault
• induction motor
• magnetic equivalent circuit

Additional information

Notes on contributors

Jawad Faiz

Jawad Faiz received his Ph.D. in electrical engineering from University of Newcastle upon Tyne, England, in 1988. He is now a professor at School of Electrical and Computer Engineering, College of Engineering, the University of Tehran. He is the author of 215 publications in international journals. His teaching and research interests are switched reluctance and variable reluctance (VR) motor design, design and modeling of electrical machines and drives, transformer modeling and design, and fault diagnosis in electrical machinery.

Mahmud Ghasemi-Bijan

Mahmud Ghasemi-Bijan received his B.Sc. in electrical engineering from University of Birjand, Birjand, Iran, in 2009 and his M.Sc. in electrical power engineering from the University of Tehran, Iran, in 2013. His current research interests include designing and modeling electrical machines and fault diagnosis in electrical machines.

Bashir Mahdi Ebrahimi

Bashir Mahdi Ebrahimi received his B.Sc. and M.Sc. (hons.) from University of Tabriz, Tabriz, Iran, in 2004 and 2006, respectively. He received his Ph.D. in electrical engineering from University of Tehran, Tehran, Iran in 2012. His current research interests include design, modeling, control, and fault machine and finite-element analysis of electromagnetic devices.