Modeling and analysis of three phase induction motor with broken rotor bar (original) (raw)
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A Survey of Broken Rotor Bar Fault Diagnostic Methods of Induction Motor
Electrical, Control and Communication Engineering, 2018
Electrical machines, induction motors in particular, play a key role in domestic and industrial applications. They act as a work horse in almost every industry and are responsible for a big proportion of total generated electricity consumption worldwide. The faults in induction motors are degenerative in nature and can lead to a catastrophic situation if not diagnosed earlier. The failures can cause considerable financial loss in the form of unexpected downtime. Broken rotor bar is a very common and frequently occurring fault in most of industrial induction motors. To select a better, more accurate and reliable fault diagnostic technique, this paper presents a comprehensive literature survey on the existing motor current signature analysis (MCSA) based fault diagnostic techniques. Different well-known MCSA based fault diagnostic techniques are summarized in the form of basic theories, considering complexity of their implementation, merits and demerits.
Induction motor modeling of broken rotor bars and fault detection by parameter estimation
An original approach is presented in this paper to diagnosis broken rotor bars in squirrel cage induction motors. A new model based on the study of the rotor faults effect on the electrical parameters is developed. We apply the Concordia transform on multi-loops squirrel cage rotor to obtain defective rotor resistance according to healthy one. Thus, we introduce an additional parameter to explain rotor faults, which allows the calculation of the number of broken rotor bars. Electrical and faulty parameters are obtained by off-line estimation technique through an output error algorithm. It is performed by taking into account prior information available on the safe system operating in nominal conditions. Thus, based on the stator dq currents, a new formulation of multivariable quadratic criterion is used in order to incorporate electrical parameters knowledge. Several faulty rotors are available to carry out experiments with a three phase induction motor. Experimental results show tha...
Analysis of Rotor Faults in Three Phase Induction Machines
Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344), 2002
The detection of broken rotor bars in three-phase induction machines by means of current signature analysis is simulated by transient analysis. Expressions are derived for all self-and mutual-inductances between individual stator coils and rotor bar loops. This detailed modeling allows for greater precision in identifying the magnitude and frequency of the current harmonics present under fault conditions. Computations were performed using the trapezoidal method. The results of this analysis are in agreement with results presented in the literature.
Analysis of broken rotor bars in large induction motors
Exacta, 2006
A new technique to detect broken rotor bars, in large squirrelcage induction motors is presented. In order to avoid problems in industrial applications, the electromagnetic behavior of induction machines with rotor faults was examined, by using a mathematical model. Simulation results are presented from the model implemented in the Simulink-Matlab. Experimental results are presented in order to validate the proposed method.
BROKEN ROTOR BAR FAULT DIAGNOSIS OF INDUCTION MOTOR BY SIGNAL PROCESSING TECHNIQUES
Induction motors finds application in almost every kind of industries all around the world. Although, Induction motors are extremely consistent, they are vulnerable to many types of faults. There are many methods available for detection of faults in Induction Motor but most of the methods require expensive sensor or specialized tools whereas current monitoring out of all does not require additional sensors. The Motor Current Signature Analysis uses the current spectrum of motor for locating characteristic fault frequencies. In the present paper, Matlab software is used to diagnosis the broken rotor fault of induction motor. Fast Fourier Transform (FFT) and Wavelet Transform (WT) are the two signal processing techniques which are used for diagnosis of the broken rotor fault in induction motors. The results and observations obtained are discussed and then final conclusions are made.
Modelling and Detection of Rotor Broken Bar Fault using Induction Motor Fed PWM Inverter 1
2012
Different types of models have been proposed in the recent years to examine different problems associated with induction motors. These models are from the simple equivalent circuit to complex d, q models and abc models which allow the inclusion of different forms of impedance and/or voltage unbalance. In the recent past, hybrid models have been developed which allow the inclusion of supply side unbalance but with the computational economy of the d, q models. Recently, there are so many applications in which induction motors are fed by static frequency inverters. Such applications are growing fast and a significant work in this field has already been done. However, still there are a lot of scopes left which may be used in this applications. This paper presents a dynamic model using PWM inverter and mathematical modelling of the motor. By using this model induction motor may be used as variable speed applications unlike conventional induction motors. The utilization of squirrel cage i...
Study and Simulation of a Broken Induction Motor Rotor Bar Caused Motor Vibration
The 15th International Conference Interdisciplinarity in Engineering
The paper presents the importance of motor vibration study and simulation; different faults which can appear during induction motor running and how broken rotor bar influences the whole system vibration. The environmental and internal, electrical and mechanical noises influence the normal functioning of the motor, increase the power consumption, deform the current spectrum, more heat is generated and vibrations are growing. Broken rotor bar changes the magnetic field distribution in the air gap between rotor and stator, unbalanced force appears which cause unwanted vibration and malfunctioning. Electrical equation is written for one rotor loop and the influence of the broken rotor bar is showed. The induction motor vibration can be studied through a simple system model with two degrees of freedom. The system model changes accordingly to the broken rotor bar and this change is studied through the transfer function written for rotor.
International Journal of Education and Information Technologies, 2023
Owing to their robust structure, induction motors are preferred to be used under difficult working conditions. Therefore, various faults may occur in the motor due to unexpected forces during the operations. Obtaining the data through experimental methods by physically creating faults in the induction motors, and analyzing their behavior is not efficient in terms of cost and time for educational purposes. Considering the above negative situation, in this paper, mathematical models have been developed in the dq0 stationary reference frame expressing three-phase stator windings short-circuit fault and broken rotor bar fault in induction motors. The proposed models are faster as compared to the other analytical models in terms of computation due to the rotor position independence of the inductance matrix. The faulty induction motor mathematical models have been implemented in the MATLAB/SIMULINK software environment with detailed explanations of each faulty model’s subsystem. As a visu...
Proposed fault diagnostics of a broken rotor bar induction motor fed from PWM inverter
Journal of Electrical Systems and Information Technology, 2016
This paper presents a fault diagnostics technique for a three-phase squirrel cage induction motor. The method is developed using a simplified model affected by bar resistance variation. Based on 3-phase time domain model, the rotor broken bar with different conditions has been simulated to investigate the resulting torque speed characteristic in each condition. The developed fault diagnostics system is capable of identifying the type of the broken-bar faults in the squirrel cage induction machines.