The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
One of the most important causes that lead to fault in the case of induction motors is rotor eccentricity which causes the unbalanced magnetic pull that leads to an increase in the noise level of the machine and a shorter lifespan of the motor through excessive wear and tear of the components. In this paper, the authors present the differences between a motor with no eccentricity and the same motor...
Finite element method is more precise than the winding function approach, as it is based on the actual geometry of the machine and the machine model can easily be modified in order to study the effect of faults on the machine's performance. Accurate models of the machine under healthy and faulty conditions are developed. This paper presents simulations of broken bars detection in a three phase squirrel...
The recent emphasis on energy conversion demands an improvement of the efficiency of three-phase induction motors (IM). The high efficiency IM can be achieved by selecting optimum motor design parameters. Therefore, it is necessary to develop an efficient evolutionary approach for optimal design of three-phase IM. This paper presents a bacterial foraging (BF) algorithm for optimizing the IM design...
Improving the efficiency of three-phase squirrel cage induction motors, which are the most energy consuming electric machines in the world, saves much energy. The efficiency can be raised by optimizing the induction motor design. The objective of this paper is mainly to develop a modified particle swarm optimization (MPSO) technique to the three-phase cage induction motor design problem with a view...
The traditional method of spectrum analysis on the current signal via FFT is hard to diagnose the fault of the broken rotor bars. This paper presents a fault diagnosis method using the RELAX algorithm in frequency domain. It can estimate the amplitude and phase values of various frequency components using coarse and fine estimation according to the criterion of minimum energy. Finally the fundamental...
The principle of vector control of AC machine enables the dynamic control of AC motors, and induction motors in particular to a level comparable to that of a DC machine. The vector control of currents and voltages results in control of spatial orientation of the electromagnetic fields in the machine and has led to term field orientation. Field oriented control schemes provide significant improvement...
Incipient fault detection of the induction machines (IM) prevents the unscheduled downtime and hence reduces maintenance costs. The Motor Current Signature Analysis (MCSA) is considered as an effective fault detection method in any IM. However, a signal processing technique, which enhances the fault signature and suppress the dominant system dynamics and noise must be considered. Frequency analysis...
Non linear control of the squirrel induction motor propelling an Electric Vehicle (EV) is designed using sliding mode theory. The proposed scheme uses an adaptive flux and speed observer that is based on a full order model of the induction motor in the indirect vector-controlled drive. The sliding mode tools allow us to separate the control from these two outputs torque and flux. To take account of...
This paper is an abridgement and update of numerous IEEE papers dealing with Squirrel Cage Induction Motor failure analysis. They are the result of a taxonomic study and research conducted by the author during a 40 year career in the motor industry. As the Petrochemical Industry is revolving to reliability based maintenance, increased attention should be given to preventing repeated failures. The...
The paper presents thermal studies of three-phase induction motor during steady-state and transient regimes using Motor-CAD environment. The graphical interfaces for data input (motor geometry, materials properties) are also shown. The supposed duty cycles are S1, S2, and S3 (continuous, short-time and intermittent periodic duty respectively). As output data the temperatures for various motor parts...
Double squirrel cage rotor design is employed in induction motor applications that require high starting torque and high efficiency operation. The outer cage of double cage rotors is vulnerable to fatigue failure since it must withstand the large thermal/mechanical stresses experienced during a loaded startup due to the high starting current and long acceleration time. However, there are only a few...
This paper describes the software environment for computer assisted design of three-phase squirrel cage induction machines. The finite element method is used as a computational technique to account for detailed geometrical properties, skew, material nonlinearity and deep-bar effect. The system enables determination of all electromagnetic quantities that are usually of interest of the designers of...
Broken rotor bar/ end-ring is a common fault in squirrel cage induction motors and has been thoroughly investigated in the case of AC grid supply. In this paper, this type of fault is studied in case of inverter driven motor. Induction motor is driven using scalar Volts/ Hz control method. Motor stator current and inverter input current spectra are studied for frequency components due to fault. Inverter...
This paper presents three methods for loss analysis of small three-phase cage induction motors under sinusoidal supply, i.e. experimental tests according to international standards, finite element-based computation, and analytical determination. Comparative loss analysis results are provided. The experimental test and the analytical determination lead to the same results for the motor energy efficiency,...
This paper deals about a 3D-FEM calculation of single phase induction machines. The modeling of the machine with respect to symmetries and machine characteristics will be described and the obtained results by the 3D-FEM-calculation will be compared with measurement data of a test machine. Furthermore the reasons why only the results obtained from a 3D-FEM calculation and not the results of a 2D-FEM...
There are various methods to determine the efficiency of three phase induction machines. But all of them have in common that they are inaccurate or they are impracticable. In this paper the machine efficiency will be derived from start up data. For that purpose the time dependence of all stator currents and all stator voltages have to been measured. Normally it isn't possible to mount a speed sensor...
This paper deals with an experimental study on stator and rotor faults of squirrel cage induction motors. The summaries of the harmonic of the stator currents for the starting and permanent operation qualitatively revealed the faults on motors. We also raised the vibrations of the motors by the use of an accelerometer. The accelerometer is used in several places of the motor in the azimuthally position...
This study presents analysis and effects of rotor faults in squirrel cage induction motor on the torque-speed curve. In the study, the used experimental data were obtained from 10 HP, 25 HP, 30 HP and 50HP submersible induction motors. The experiments were made during the motors start up under no-load condition. Torque and speed of the motors were sampled and saved for every starting. The motor speed...
In this work, models combining NEMA's classes A and D slot geometry are created, with the use of a library of parameterized Squirrel Cage Induction Machine models. The models were analyzed using AC non-linear FEM analysis. The influences of the different analogy of class A versus class D slots in the asynchronous cage motor, on the distribution of the magnetic field, the torque as well as the stator...
The analytical expressions for stator current harmonics frequencies in the spectrum of saturated cage and wound rotor induction motor are derived in the paper. Knowledge of stator current spectrum of healthy motor supplied by symmetrical three-phase voltages is the starting point for application of the most popular noninvasive diagnostic and condition monitoring technique of these machines - motor...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.