Study and Simulation of a Broken Induction Motor Rotor Bar Caused Motor Vibration (original) (raw)
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Modeling and analysis of three phase induction motor with broken rotor bar
17th IEEE International Multi Topic Conference 2014, 2014
Owing to their extensive use and waste presence in different procedures and processes, induction machines are rightly called as the work horses of the industry. Adequate and timely maintenance, fault finding and repair of these machines is a mandatory requirement for efficient working. In literature, extensive work has been presented exploring induction machine faults their symptoms and remedies. Broken rotor bar is one of the highly investigated. Due to the complexity involved in observing this fault, indirect methods to detect its presence are employed. Simulation is a modern tool to analyze machines under different operating conditions. However, in case of a faulty machine, model becomes different as compares to the normal mode. In this paper a three phase induction machine model is presented having broken rotor bars. Moreover, comparative analysis is performed between faulty and healthy case. An easy to comprehend model of an induction motor in abc frame is described to understand the parametric change of a faulty model of an induction motor. The implementation of both healthy and faulty model is done using Matlab/Simulink software. First, the healthy motor is simulated and then the results of faulty motor are compared with the healthy motor to understand the change in response of faulty and healthy motor. Consideration is on broken rotor bar fault but other faults like bearing fault, phase imbalance and mechanical faults can also occur because of broken rotor bar. As the motor is the backbone of the process of an industry a short time shut down of a plant is avoided, the method proposed can be helpful in understanding the current and frequency response of an induction motor which can be use to avoid breakdown maintenance.
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.
Locating rotor broken bars in induction motors using finite element method
Energy Conversion and Management, 2009
Number of broken bars and varying load have been so far proposed in the literature in the process analysis of induction motors under broken rotor bars. In this paper, it is shown that there is the third factor which affects the diagnosis of the broken bars fault. This deterministic factor is the location of the broken bars which is determined precisely here. It is also shown that distribution of the broken bars over different poles of the motor reduces the amplitude of the harmonic components due to the fault. In this paper, the stator current frequency spectrum of a faulted induction motor is obtained for all cases in which four broken bars are distributed over poles of the motor. It is shown that the amplitudes of harmonics (1 ± 2s)f s are a suitable index for locating the rotor bars breakage. In this paper, the torque frequency spectrum of a faulted induction motor has been obtained for various cases of the bars breakage location and shown that the bars breakage location influences the amplitudes of harmonic components 2sf s in the torque frequency spectrum. Time stepping finite element method (TSFEM) is used to model an induction motors with rotor broken bars. In this modeling, geometrical and physical characteristics of all parts of the motor, spatial distribution of stator windings, slots on both sides of the air gap and non-linear characteristic of the core materials are included. Meanwhile the current of the broken bar is taken to be non-zero, instead resistance of the broken bar is considered large enough. In fact, this is the real case, because there is an inter-bar current within the broken bar induction motor. Since there is noise, unbalanced magnetic pull and arc in the broken bar induction motor, acceleration of the faulty motor up to the steady-state is considered here. It is indicated that the location of the rotor bars has significant effect upon the torque of the faulty motor and when the broken bars concentrate over one pole of the motor, the torque of faulty motor oscillates more.
Journal of Fundamental and Applied Sciences, 2015
It is well known that the number of broken bars and varying load affect on the amplitudes of specific harmonic components 1 2 s ks f in the process analysis of induction motors under broken rotor bars. The location of broken bars is an important factor which affects the diagnosis of the broken bars defect. In this paper the simulation is determinate for different cases for distribution of broken bars under induction motor pole in order to show the impact of broken bars location upon the amplitude of harmonic fault. The simulation results are obtained by using time stepping finite elements (TSFE) method. The geometrical characteristics of motor, the effects of slotting and the magnetic saturation of lamination core are included in induction motor model.
Induction motor fault diagnosis based on vibration analysis: A case study
2013
In this paper, a case study is presented which demonstrates the efficiency of vibration analysis in induction motor rotor fault detection and diagnosis. Vibration signals of a 3,15 MW induction motor were acquired. The observed motor is specific due to its very low slip, which can cause some difficulties in fault diagnostic process. Employing some of well-known signal processing and analysis techniques, characteristic features in frequency domain were observed. Using the previous experience in fault detection and diagnosis, it is determined that a rotor fault, a broken bar in specific, is present in the motor. Based on this analysis, a general repair of the motor was carried out and the diagnosed fault was confirmed. This way, applying the fault detection and diagnosis in early fault stage, some serious malfunctions and failures were avoided, which resulted in decreased repair costs and undisturbed delivery of heat energy during the heating season.
Proceedings of IncoME-V & CEPE Net-2020, 2021
This book series establishes a well-defined forum for monographs, edited Books, and proceedings on mechanical engineering with particular emphasis on MMS (Mechanism and Machine Science). The final goal is the publication of research that shows the development of mechanical engineering and particularly MMS in all technical aspects, even in very recent assessments. Published works share an approach by which technical details and formulation are discussed, and discuss modern formalisms with the aim to circulate research and technical achievements for use in professional, research, academic, and teaching activities. This technical approach is an essential characteristic of the series. By discussing technical details and formulations in terms of modern formalisms, the possibility is created not only to show technical developments but also to explain achievements for technical teaching and research activity today and for the future. The book series is intended to collect technical views on developments of the broad field of MMS in a unique frame that can be seen in its totality as an Encyclopaedia of MMS but with the additional purpose of archiving and teaching MMS achievements. Therefore, the book series will be of use not only for researchers and teachers in Mechanical Engineering but also for professionals and students for their formation and future work. The series is promoted under the auspices of International Federation for the Promotion of Mechanism and Machine Science (IFToMM).
Estimation of parameters of induction motor with broken rotor bars
2011 7th International Conference-Workshop Compatibility and Power Electronics (CPE), 2011
This paper describes the evaluation of parameters of a three-phase induction motor with broken rotor bars. Such fault causes electric and magnetic asymmetry in the machine. Using standard d-q model of induction motor this asymmetry can be expressed through differently modified rotor parameters in both axes. In pursuing the goal to establish accurate motor parameters, a non-standard, one-phase measuring method was employed. In this way angle dependence of rotor parameters following a sinusoidal shape was determined. Additionally to measurements an extensive finite element analysis has been performed for two purposes. Firstly, to assess the measurement results of the method and, secondly, to predict various situations which can not be easily achieved by measurements due to hardware limitations (e.g. different numbers of broken bars). Finite element analysis evidences the correctness of the machine parameters obtained from proposed measurement method.
Modeling and Minimization of Speed Ripple of a Faulty Induction Motor With Broken Rotor Bars
IEEE Transactions on Industry Applications, 2000
This paper presents a technique of modeling and minimization of speed ripples of a vector-controlled faulty induction motor (IM) with broken rotor bars. First, the performance of the faulty IM is investigated in terms of speed ripples under the open-loop condition. Then, a new IM model is developed, incorporating the speed ripples. Consequently, a new neuro-fuzzy controller (NFC) is proposed to tolerate the fault effect under an indirect field-oriented control scheme. The proposed NFC can compensate the motor rotation imperfections by minimizing the supply frequency-related speed ripples instead of directly working on the low-frequency speed ripples exhibited by a faulty IM. A novel self-tuning algorithm is proposed to adjust the weight of the developed NFC, and its training convergence is investigated by simulation. The effectiveness of the developed NFC is verified by both simulation and experimental tests. Index Terms-Fault-tolerant control, faulty induction motor, neuro-fuzzy controller, real-time implementation, speed ripple minimization. M. Nasir Uddin (S'98-M'00-SM'04) received the B.Sc. and M.Sc. degrees in electrical and electronic engineering from Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh, and the Ph.D. degree in electrical engi-
Detection and Classification of the Broken Rotor Bars in Squirrel-Cage Induction Motors
Mechanical faults, stator faults and rotor faults are the major faults of induction motors. Rotor faults constitute about 10% of total faults of induction motors. The main reasons of rotor faults are the broken rotor bars. Many methods have been used to detect broken rotor bars till now. In this paper, a new method is introduced. A squirrel-cage induction motor is modeled by using MATLAB/Simulink. Model takes motor speed as an input and finds the frequency of side-band harmonics of stator current. Then model compares the magnitudes of side-band harmonics with the magnitude of fundamental component and classifies them according to the number of broken rotor bars. At any load and speed, the method can find and classify the broken rotor bars based on the number of broken rotor bars. Experimental results, along with simulation results verifies the effectiveness of the method
Analytical Analysis of Cage Rotor Induction Motors in Healthy, Defective and Broken Bars Conditions
IEEE Transactions on Magnetics, 2014
This paper presents a two-dimensional (2-D) static analytical method in the frequency domain for the calculation of magnetic field distribution, eddy-currents, circuit model parameters and study state performances in multi-phase/-pole cage rotor induction motors with integer and fractional stator winding. The complex model allows the study the healthy, defective and broken bars conditions in these electrical machines. The proposed static analytical model takes into account stator and rotor slotting with tooth-tips. The method is based on the resolution of Poisson's, Laplace's and Helmholtz's equations in stator slots, air-gap and rotor bars regions respectively. The electromagnetic torque is obtained from both the electrical equivalent circuit (EEC) and Maxwell stress tensor that is given by the magnetic field calculation. The analytical results are validated by those issued from time harmonic finite-element method (Fem).