Analysis Of Three-phase Induction Motor Research Articles

Performance analysis of three-phase induction motor for railway propulsion system

A three-phase induction motor absorbs the most electric power among other electrical loads. Therefore, three-phase induction motors are the primary electric motors used in industrial applications thanks to their simple construction and easy operation, as well as low cost and low maintenance costs. Efficiency is a critical parameter that characterizes an induction motor as a traction motor. The traction motor is defined as the engine's effectiveness in converting electrical power at its input into mechanical energy by rotating torque on its axis. One way to analyze the efficiency is to use test data obtained from laboratory tests in case-loaded and no-load tests. Calculations using several formulas on the efficiency of an induction motor as a traction motor produce the same result, namely the efficiency of 98.6% by applying variable frequency drive (VFD). The result of laboratory tests and their analysis can be used as a reference for designing three-phase induction motors for railway traction motors, especially traction motors for high-speed trains<em>.</em>

A Graphical User Interface for Clarke-Park Transforms based on LabVIEW

Before any electrical system is used in industrial applications, its behavior under different operating conditions must be studied. A mathematical model must be constructed beforehand in order to observe the behavior of the system under different conditions. Modeling of three-phase asynchronous motors with an electromechanical converter is very difficult due to the time varying current and voltage. While performing dynamic analysis of such motors, a common reference system must be determined. The most commonly used methods to facilitate the analysis of three-phase induction motors are Clarke-Park transforms. In this study, a visual interface has been prepared to ease the teaching of Clarke-Park transforms. The users are moved from the 3-phase (A,B,C) axis to the reference 2 phase (α,β) axis through the interface and to the (d,q) axis with the θ angle at the magnitudes defined in the (α,β) axis system. With the interface prepared, users can change the voltage, frequency and angle values and graphically observe their effect on Clarke and Park transforms. In addition, the conversion from 2-phase axis to 3-phase axis is made with inverse Clarke and Park transforms. Mathematical modeling of the transform and the interface were made using LabVIEW.

Automatic Condition Monitoring of Industrial Machines Using FSA-Based Hall-Effect Transducer

A reliable and swift real-time condition monitoring for an industrial machine is a need of the hour when dealing with critical uncontrollable machine failures such as stator winding insulation failure, which is more prominent while working in robust conditions. Early detection of stator winding faults, especially turn-turn fault, occurred mainly as a short-circuit between the winding of the same phase due to the insulation failure, which can prevent fault propagation and protect winding from further insulation damages. This paper presents steady and transient state analysis of three-phase induction motor using fault signature analyzer based hall-effect transducer under various fault conditions. A numerical model with stator winding faults has been implemented, taking into account two major faults such as stator turn-turn (STTF) and stator phase-neutral fault (SPhN), using finite element method (FEM). FEM obtains the symmetrical current components of the motor under different fault conditions using finite element analysis (FEA). The machine torque has also been modeled and compared in a healthy and faulty condition. The numerical finite element method (FEM) model could identify a healthy and faulty induction machine with 95% accuracy using finite element analysis (FEA) and the same was validated using experimental setup results under the same operating conditions.

Direct Analysis of Three-Phase Induction Motor Considering Rotor Parameters’ Variation and Stator Belt Harmonics Effect

In this article, a novel procedure for the induction motor analysis is presented, avoiding the time-domain finite element problem formulation. The proposed technique closely links the mathematical model of the motor to the finite element simulations, concerning magneto-static and time-harmonic analyses. The target of the method is to include, in a rapid machine computation, also the effect of the slip frequency on the bars' current distribution and the induced currents in the cage due to the stator belt harmonics. The reported analysis example concerns the stand still operation of a double cage induction machine, where the rotor frequency is the grid frequency and the high stator current intensifies the role of the belt harmonics. A further application example concerns a flux weakening working point of a single cage induction motor in a variable speed drive. The aim of this work is to propose procedures to get a fast prediction of the induction motor performance, including also the principal parasitic effects, e.g. the rotor bars' skin effect and the stator belt harmonics, without using any time-domain analysis.

Speed Control of DTC_SVM for Induction Motor By Using Genetic Algorithm-based PI Controller

This work presents analysis of three-phase Induction Motor (IM) performance with Direct Torque Control based Space Vector Modulation (DTC-SVM). DTC-SVM scheme is a kind of high-performance control of IM drives to improve the ripples of torque and flux in steady state, this drawback of conventional DTC. (DTC-SVM) has three Proportional-Integral (PI) controllers, one utilized as the PI speed controller and other PI flux controller and PI torque controller which are utilized to produce the stator voltage reference V_ds and V_qs respectively. This paper offers a comparison among two methods utilized for tuning the PI speed controller in DTC_SVM of IM drive. One is trial and error method, while the second is Genetic Algorithms (GA). GA helps to get the optimal PI speed controller parameters. The results of a simulation carried out utilizing MATLAB/Simulink program (R2014a) show that the response of speed motor with GA is better and reaches to the reference value faster than another method

Performance Analysis of Three-Phase Induction Motor with AC Direct and VFD

The electrical machine analysis and performance calculation is a very important aspect of efficient drive system design. The development of power electronics devices and power converters provide smooth speed control of Induction Motors by changing the frequency of input supply. These converters, on one hand are providing a more flexible speed control that also leads to problems of harmonics and their associated ailments like pulsating torque, distorted current and voltage waveforms, increasing losses etc. This paper includes the performance analysis of three phase induction motor with three-phase AC direct and variable frequency drives (VFD). The comparison has been concluded with respect to various parameters. MATLAB-SIMULINKTM is used for the analysis.

Stator fault analysis of three-phase induction motors using information measures and artificial neural networks

The three-phase induction motors are considered one of the most important elements of the industrial process. However, in this environment, these machines are subject to electrical and mechanical faults, which may cause significant financial losses. Thus, the purpose of this paper is to present a pattern recognition method for the detection of stator windings short circuits based on measures of mutual information between the phase current signals. In order to validate the proposed patterns, feature vectors obtained from normal and faulty motors are applied to two topologies of artificial neural networks. The classification results presented accuracies over 93% even when the motors were subject to several conditions of load torque and power supply voltage unbalance.

Effect of stator construction of three-phase induction motors on core loss

This paper presents the iron loss analysis of three-phase induction motors. It is necessary to consider the detailed magnetic characteristics inside induction motors to minimalize and optimize the losses. Therefore, the authors examined the loss distribution by the finite element method considering the two-dimensional magnetic properties to develop higher efficiency induction motors.

On the domain decomposition and transmission line modelling finite element method for time-domain induction motor analysis

This paper demonstrates how a finite element model which exploits domain decomposition is applied to the analysis of three-phase induction motors. It is shown that a significant gain in CPU time results when compared with standard finite element analysis. Aspects of the application of the method which are particular to induction motors are considered: the means of improving the convergence of the nonlinear finite element equations; the choice of symmetrical sub-domains; the modelling of relative movement; and the inclusion of periodic boundary conditions.

Finite element analysis of three-phase induction motors: comparison of two different approaches

The paper presents a comparison between two different finite element analysis methods of three-phase induction motors. The first method is based on the equivalent circuit of the motor. The field solutions reproduce the indirect (no load and locked rotor) tests, to determine the parameters of the equivalent circuit. The second method, based only on the field solution, reproduces the direct (load) tests. It combines the field solution with the circuital one, imposing the motor voltage directly. Both approaches work with a two-dimensional discretised domain and are applied to a 4 poles and three-phase induction motor. The results are shown by means of figures and tables. From the comparison useful considerations about the finite element analysis of the induction motor can be obtained.

Analysis of three-phase induction motor with faulty cage rotor.

The rotor bars and end-rings of a squirrel cage induction motor are forced to break when it is driven under the overload duty cycle as frequently accelerating and braking operations, although it has essentially mechanical ruggedness.In this paper we present a model of squirrel cage induction motor with the above rotor faults, show a method of analysis, and discuss the relations between the various faults conditions and the amplitude of abnormal frequency components of the currents and torque. The results are summarized as follows.(1) The amplitude of abnormal frequency component increases with the number of broken bars, while it decreases with increasing the number of broken end-rings, in the case of less than five consecutive fault positions.(2) The amplitude of abnormal frequency component becomes maximum when the distance between two broken bars is 180°k(k=l, 2, …, 2P-1: P; No. of pole pairs) in electrical angle, whereas it becomes minimum at 90°×(2k-1) (k=1, 2, …, 2P) in angle.(3) The influence of end-ring faults is maximum at 180°×(2k-1) (k=1, 2, …, 2P) in electrical angle.It is assured that the measured results obtained by the artificially faulted test machine have a good agreement with the analytical results.

Transient and steady-state operation of induction motors with rotor asymmetries

Steady-state analysis of three-phase induction motors with asymmetrical stator external impedances is presented by the application of the symmetrical components theory. New and general equivalent circuits are derived, and it is shown how they can be extended for constant-speed transients, too. State-variable equations are given for the case of asymmetrical stator voltages and external resistances. — By the application of a new two-phase symmetrical component transformation, steady-state equations of an asymmetrical two-phase machine with nonquadrature windings are set up; a new equivalent circuit is also derived. Transient equations are also given.

A general method of analysis of three-phase induction motors with asymmetrical primary connections

It is demonstrated that a systematic application of the theory of symmetrical components to the phase quantities of a symmetrically-wound induction motor provides a general method of analysis which can be used to predetermine the performance characteristics of the motor for any form of asymmetrical primary connection. Among the particular forms of asymmetry considered in some detail are abnormal connection of the primary phases and the insertion of asymmetrical line impedances or auto-transformers.It is noted that discrepancies in published work on the subject are due to ignoring the presence, or incorrectly assessing the effect, of the zero-sequence system; this system is therefore given special attention. Experimental results confirm the validity of the general method.

A general method of analysis of three-phase induction motors with asymmetrical primary connections

A general method of analysis of three-phase induction motors with asymmetrical primary connections