This paper proposes a novel method for the rotor bar fault diagnosis of induction machines containing space harmonics. This method is based on the analyses of the magnitude of the stator current and the asynchronous actions due to the... more
This paper proposes a novel method for the rotor bar fault diagnosis of induction machines containing space harmonics. This method is based on the analyses of the magnitude of the stator current and the asynchronous actions due to the space harmonics on the torque-speed characteristic of the induction machine with and without broken rotor bars. To achieve this objective, three squirrel cage induction machine models were simulated in the dynamic and steady-state conditions in the case of healthy machine, one broken rotor bar, and two broken rotor bars machine. These models take into account the 5th, 7th, 11th, and 13th space harmonic. The results shown that, the proposed method gives more information on the state of the machine to carry out a more precise diagnosis study.
Research Interests:
Research Interests:
Research Interests:
An original line-starting method for a synchronous machines, which do not have damping windings, is investigated in this paper. A general overview of line start synchronous machines is first presented. Problems related to the... more
An original line-starting method for a synchronous machines, which do not have damping windings, is investigated in this paper. A general overview of line start synchronous machines is first presented. Problems related to the line-starting of synchronous machines is first presented. The new line starting method is investigated using both electrical circuits modeling, and coupled 2D finite element and circuit modeling.
Research Interests:
With the rising fuel cost, increasing demand of power and the concerns for global climate change, the use of clean energy make the connection of power electronics building bloc in the heart of the current research. The high output current... more
With the rising fuel cost, increasing demand of power and the concerns for global climate change, the use of clean energy make the connection of power electronics building bloc in the heart of the current research. The high output current applications make the parallel connection of modular inverters to be a solution for the use of low power building block inverters where the output power cannot be handled by a single inverter configuration. In this context, average-modeling using average phase–leg technique allows the n-parallel connected inverters to be analyzed accurately and rapidly without requiring the complexity of the full switched inverter topology. The obtained analytical solution along with the equivalent circuit model makes easier the design of the control loop. The analytical solution of the n-parallel connected inverters shows the impact of the line and grid impedance on the performance of the overall system. The impact of this coupling has to be investigated such that the main feature of paralleling inverters is guaranteed and that the inverter mode of operation will not be compromised. The main advantage of paralleling inverters can be lost for a certain coupling impedance considerations
ABSTRACT The subject of this article is to optimize the design and compare the performances of synchronous reluctance machines with salient pole rotor and multi- flux barrier rotor. The optimization procedure, which focuses on the... more
ABSTRACT The subject of this article is to optimize the design and compare the performances of synchronous reluctance machines with salient pole rotor and multi- flux barrier rotor. The optimization procedure, which focuses on the maximization of the machine’s torque to Ampere ratio, is based on a cyclic algorithm coupled with the magnetostatic finite-element field solutions. The optimization results regarding the two types of machines which provide the optimized rotor geometrical dimensions and the influence of the current angle are discussed. Index Terms-- Synchronous Reluctance Machine; Torque Optimization; Cyclic Relaxation; Finite Element.
Research Interests:
ABSTRACT
Research Interests:
Research Interests: Engineering, Environmental Science, Computer Science, Renewable Energy, Sensitivity Analysis, and 15 moreEnergy Conversion, renewable Energy sources, Solar Energy, Power Generation, System Reliability, Case Study, Renewable Energy System, Wind energy conversion system, Power Supply, OPTIMIZATION TECHNIQUE, Economic valuation, Economic performance, Photovoltaic system, Electricity Generation, and Hybrid System
Research Interests:
Research Interests:
ABSTRACT An analytical model of slotless PM motor with segmented magnets is presented. The Ampere's approach is adopted for the modeling of permanent magnets and separation variables method is used to calculate magnetic field in... more
ABSTRACT An analytical model of slotless PM motor with segmented magnets is presented. The Ampere's approach is adopted for the modeling of permanent magnets and separation variables method is used to calculate magnetic field in all magnetic air-gap of the motor. The model considers parallel magnetized magnet segments by the introduction of volume current densities inside the magnet regions as well as surface currents on their boundaries. A finite element package is used to validate the proposed model.
Research Interests:
The implications of the influence of alternating currents on buried pipelines are of great concern to all pipeline owners in world. The relevance of the interference is always increasing for operational personnel and for the protection of... more
The implications of the influence of alternating currents on buried pipelines are of great concern to all pipeline owners in world. The relevance of the interference is always increasing for operational personnel and for the protection of buried metallic structures from corrosion. The paper studies the electromagnetic interference problem between an existing high voltage power line and a newly designed underground pipeline cathodically protected. Induced voltages and currents are evaluated for steady state operating conditions of the power line. It is found that on pipelines suffering from A.C. interference traditional pipe-to-soil potential measurements do not guarantee efficient cathodic protection against corrosion. A specific approach to assess the effectiveness of cathodic protection should be adopted.
Research Interests:
... In addition, a thermal resistance that allows for the poor thermal contact between the stator laminations and the frame is included [2,3]. The equivalent thermal network (ETN) of the motor is presented in Fig. ... Fig. 4. Equivalent... more
... In addition, a thermal resistance that allows for the poor thermal contact between the stator laminations and the frame is included [2,3]. The equivalent thermal network (ETN) of the motor is presented in Fig. ... Fig. 4. Equivalent thermal network of the induction machine Iv. ...
Research Interests:
Les aimants permanents modernes sont aujourd’hui à la base de la construction d’actionneurs électromécaniques pour des applications particulières à hautes performances dans la gamme des faibles et des moyennes puissances. Les actionneurs... more
Les aimants permanents modernes sont aujourd’hui à la base de la construction d’actionneurs électromécaniques pour des applications particulières à hautes performances dans la gamme des faibles et des moyennes puissances. Les actionneurs à aimants permanents sont capables d’améliorer les performances en couple volumique, en puissance massique, en fiabilité et en comportement dynamique et statique. Dans cette communication, nous présentons deux méthodes menant à la définition des paramètres géométriques optimaux de deux structures d’actionneurs électromécaniques alimentés par des créneaux de courant et faisant l’objet de recherche au Laboratoire de Machines Electriques de l’ENPolytechnique d’Alger. La première méthode, analytique, est utilisée pour dimensionner les aimants et l’ouverture angulaire du fer interpolaire d’un actionneur à aimants insérés à aimantation radiale. Cette structure, avec des aimants de type Samarium-Cobalt, est intéressante quand on recherche un meilleur rappo...
Research Interests:
... Omar Sid, Mohamed Menaa and Samir Hamdani Laboratoire des Systèmes Electriques et Industriels, Département d ... Kowalski et al [8] proposed two kinds of neural networks NN for induction motor ... through channels of 16 bits, 200 kHz... more
... Omar Sid, Mohamed Menaa and Samir Hamdani Laboratoire des Systèmes Electriques et Industriels, Département d ... Kowalski et al [8] proposed two kinds of neural networks NN for induction motor ... through channels of 16 bits, 200 kHz PCI data acquisition (DAQ) board and ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
... Content may change prior to final publication. > 09-1678-TIE.R2 < 4 Fig.4: Experimental setup - Three-phase 4-kW induction machine, - DC generator coupled to the IM to provide load, -Tacho-generator coupled to the shaft of the... more
... Content may change prior to final publication. > 09-1678-TIE.R2 < 4 Fig.4: Experimental setup - Three-phase 4-kW induction machine, - DC generator coupled to the IM to provide load, -Tacho-generator coupled to the shaft of the generator as angular speed sensor to measure ...
Research Interests:
Despite its considerable potential for energy savings, energy efficiency is still far from realizing this potential. This is particularly true in the electrical sector (IEA, 2010). Why? There is no probably just one single answer to this... more
Despite its considerable potential for energy savings, energy efficiency is still far from realizing this potential. This is particularly true in the electrical sector (IEA, 2010). Why? There is no probably just one single answer to this question. A consequential response requires major multiform research and an analytical effort. No doubt that analysis of the
A method for predicting the steady state performance of a solid rotor induction motor using coupled non-linear complex finite elements is described. The principle of the model is to consider two starting times, ω in the stator region and... more
A method for predicting the steady state performance of a solid rotor induction motor using coupled non-linear complex finite elements is described. The principle of the model is to consider two starting times, ω in the stator region and sω in the rotor region. The coupling between the rotor and the stator is achieved by two means using Lagrange multipliers
Research Interests:
ABSTRACT This paper presents a survey of synchronous machine modeling and parameter identification. In addition, the paper presents results of a study conducted to estimate the effects of measurement noise on the estimation of machine... more
ABSTRACT This paper presents a survey of synchronous machine modeling and parameter identification. In addition, the paper presents results of a study conducted to estimate the effects of measurement noise on the estimation of machine parameters from Standstill Frequency Response (SSFR) test data. Results obtained indicate that because the test data are inherently noise-corrupted, multiple solution sets can be obtained. Furthermore, the effect of noise on time-domain parameter estimation of synchronous machine models axe studied. It is shown that a unique set of parameters can be obtained and the noise effects can be dealt with effectively when the maximum likelihood estimatiou (ML) technique is used to estimate machine parameters.
Research Interests:
Research Interests:
The prediction of the magnetic field is a prerequisite to investigate the motor performance. This paper focuses on the magnetic field estimation of surface-mounted permanent-magnet (SMPM) motors based on two approximations, i.e., the... more
The prediction of the magnetic field is a prerequisite to investigate the motor performance. This paper focuses on the magnetic field estimation of surface-mounted permanent-magnet (SMPM) motors based on two approximations, i.e., the magnetic circuit analysis and the finite-element analysis (FEA). An equivalent magnetic circuit model is applied to analytically evaluate the magnetic field of a SMPM motor with exterior-rotor configuration. The two-dimensional FEA is then applied to numerically calculate the magnetic field and to verify the validity of the magnetic circuit model. The results show that the errors between the analytical predictions and FEA results are less than 6%. It is of benefit to further design purposes and optimization of SMPM motors.
Research Interests:
Research Interests:
Induction machine models used for steady-state and transient analysis require machine parameters that are usually considered design parameters or data. The knowledge of induction machine parameters is very important for Indirect Field... more
Induction machine models used for steady-state and transient analysis require machine parameters that are usually considered design parameters or data. The knowledge of induction machine parameters is very important for Indirect Field Oriented Control (IFOC). A mismatched set of parameters will degrade the response of speed and torque control. This paper presents an improvement approach on rotor time constant adaptation in IFOC for Induction Machines (IM). Our approach tends to improve the estimation accuracy of the fundamental model for flux estimation. Based on the reduced order of the IM model, the rotor fluxes and rotor time constant are estimated using only the stator currents and voltages. This reduced order model offers many advantages for real time identification parameters of the IM. Keywords—Indirect Field Oriented Control (IFOC), Induction Machine (IM), Rotor Time Constant, Parameters Approach Adaptation. Optimum rotor flux.
Research Interests:
In this paper a model of the Self Excited Dual Star Induction Generator in an autonomous operation is presented. The model developed to study the dynamics of the Dual Star Induction Generator is based on the model of R. H Park. The... more
In this paper a model of the Self Excited Dual Star Induction Generator in an autonomous operation is presented. The model developed to study the dynamics of the Dual Star Induction Generator is based on the model of R. H Park. The knowledge of the magnetic characteristic and its mathematical model are required. The model is then used to analyze the static and dynamic performances of the generator. An application as an autonomous generator under balanced and unbalanced operation supplying various types of loads is simulated. The results obtained by simulation are presented and discussed.
Research Interests:
Research Interests:
In this paper, in order to improve the fault detection of the broken rotor bars, models of healthy machine, one and two broken rotor bar machines taking a count the first space harmonics were simulated. Motor current signature analysis... more
In this paper, in order to improve the fault detection of the broken rotor bars, models of healthy machine, one and two broken rotor bar machines taking a count the first space harmonics were simulated. Motor current signature analysis method is the technique for extracting information of the stator current in the band frequency of 0–700 Hz. The results show that the study of the sidebands presented around the supply frequency, the principal components and the additional components of the space harmonics enables us to carry out a more precise state of the rotor defect. This method gives more information on the state of the machine to carry out a more precise diagnosis study. The experimental results prove the efficiency of the proposed method.
Research Interests:
In this work, we discuss multi-objective design optimization of permanent magnet synchronous motor (PMSM) solved by genetic algorithm (GA) and boundary element method. We choose the decrease of cogging torque and the increase of torque as... more
In this work, we discuss multi-objective design optimization of permanent magnet synchronous motor (PMSM) solved by genetic algorithm (GA) and boundary element method. We choose the decrease of cogging torque and the increase of torque as objectives applied to multi-objective optimization (MO) of automotive permanent magnet synchronous motor. The airgap length, teeth width and magnetization angle of permanent magnet (PM)
Research Interests:
This paper presents an analytical method for the design of permanent magnet synchronous motors (PMSM) equipped with several and odd number of radial magnet bars with different remanence. The thickness of each magnet bar is fixed. So that,... more
This paper presents an analytical method for the design of permanent magnet synchronous motors (PMSM) equipped with several and odd number of radial magnet bars with different remanence. The thickness of each magnet bar is fixed. So that, the magnetization waveform generated has almost sinus waveform. The proposed rotor structure is an alternative to the well-known Halbach and hybrid magnetization which exhibits low cogging torque and torque ripple. The analytical solution is derived by solving the field governing equations in each subdomain and with applying the boundary and interfaces conditions. Analytical results are validated by the finite-element method (FEM).
Research Interests:
The authors develop the squirrel cage induction machine models for the diagnosis of defects from an approach of magnetically coupled multiple circuits. The generalized models are established on the base of mathematical recurrences. The... more
The authors develop the squirrel cage induction machine models for the diagnosis of defects from an approach of magnetically coupled multiple circuits. The generalized models are established on the base of mathematical recurrences. The calculation of machine inductances (with and without rotor defects) is carried out by the tools of software MATLAB before the beginning of simulation under software SIMULINK. The experimental tests were carried out on four induction machines of power 4 kW, especially manufactured for the needs for the diagnosis and presenting defects in the rotor. The simulated results and the experimental ones are presented to confirm the validity of proposed models
Research Interests:
The current filaments (CFM) and the finite elements (FEM) models for analyzing Tubular Linear Induction Motor (TLIM) performances are presented. The governing equations of CFM model can be reduced to the ordinary differential equations... more
The current filaments (CFM) and the finite elements (FEM) models for analyzing Tubular Linear Induction Motor (TLIM) performances are presented. The governing equations of CFM model can be reduced to the ordinary differential equations that can be solved by numerical method and it is easy to program. A 2D time harmonic finite elements analysis of the motor is used to validate the current filaments model. In order to analyze the electromagnetic performances of the motor, the two models are used to computing the electrical parameters, and the locked rotor and transient operations. A laboratory prototype of a tubular induction motor has been built for experimental study.