M. LADGHEM-CHIKOUCHE Brahim

Prof

Directory of teachers

Department

DEPARTEMENT OF: ELECTRICAL ENGINEERING

Research Interests

Modélisation électromagnétique des Machines électriques Conception des Machines électriques

Contact Info

University of M'Sila, Algeria

Email : brahim.lch@univ-msila.dz

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Recent Publications

2024-11-24

Extraction of leak parameters in WDNs using EMD of vibration signals in HDPE pipes

This study uses the empirical mode decomposition (EMD) method to address the issue of pipeline water leak detection. Acoustic and vibration signals that propagate throughout the pipeline at low frequencies are caused by leaks and have nonlinear and non-stationary features. Other potential causes of the received signals with unknown frequencies include the hydraulic pressure, pipe diameter, kind of pipe, and size of the leak. The choice of the narrow periods and causes, and consequently the loss of valuable information, limits the study of such leakage signals using traditional methods for instance the FFT, the correlation, and the cepstrum. Multiple stationary components (IMFs) can be used to treat the received signals independently by allowing the EMD non-stationary time domain decomposition approach. The EMD analysis is applied to a few leak positions in the pipeline and contrasted with the leak methods currently in use. Our experimental findings, when applied to time domain analysis, show that the EMD approach offers superior leak detection capabilities.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-11-24), "Extraction of leak parameters in WDNs using EMD of vibration signals in HDPE pipes", [national] La 2ème Conférence Nationale sur l’Electronique, le Génie Electrique, les Télécommunications, et la Vision par ordinateur (C3ETCV’24) , Mila-Algeria

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Cepstral analysis-based method for detecting leaks in water supply networks

The detection of leaks in water distribution systems is a crucial aspect of conserving and managing water resources. Drawing inspiration from speech and speaker signal processing, this paper explores the application of cepstrum analysis to identify pipeline leaks. The concept is based on the analogy that water flow in pipes is similar to sound waves flowing through the vocal tract, with a leak equivalent to an opening in the vocal tract, such as the mouth or nose. A laboratory-scale prototype pipeline made of steel was used to test the proposed method. The results obtained using cepstrum analysis were compared to those from three conventional methods: autocorrelation, Fast Fourier Transform (FFT), and the logarithm of FFT. The comparative results demonstrate the effectiveness of the proposed method in tracking leaks in various scenarios, characterized by clear peaks at the same frequency and moment, outperforming the three considered methods.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-11-24), "Cepstral analysis-based method for detecting leaks in water supply networks", [national] La 2ème Conférence Nationale sur l’Electronique, le Génie Electrique, les Télécommunications, et la Vision par ordinateur (C3ETCV’24) , Mila-Algeria

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Application of the DSK C31 Card for Real-Time Water Leak Detection

In this research we have proposed an innovative method called the cepstral method for leak detection in water distribution network pipes. The cepstral analysis was chosen because it has a very good performance-complexity ratio. The application was made at the electronics laboratory. In order to simulate the distribution network, a short hybrid prototype channel was used. The acquisition of leak signals was done using a DSK cardc31. The validation tests of the proposed technique have shown its effectiveness.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-11-24), "Application of the DSK C31 Card for Real-Time Water Leak Detection", [national] La 2ème Conférence Nationale sur l’Electronique, le Génie Electrique, les Télécommunications, et la Vision par ordinateur (C3ETCV’24) , Mila-Algeria

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Modeling Energy Loss Density in Dynamic Regime: The Effect of Frequency on Moving Magnetic Walls

This study presents a novel approach to simulating magnetization processes using magnetic domain wall motion and domain rotation. We introduce a modified inverse Jiles-Atherton model that incorporates a viscosity-type equation to account for the time difference between flux density and applied field. The model's key feature is a parameter v, which allows for the regulation of energy loss density along specific parts of the hysteresis loop. The effectiveness of our approach is demonstrated through comparisons between measured and modeled hysteresis loops across various frequencies.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-11-24), "Modeling Energy Loss Density in Dynamic Regime: The Effect of Frequency on Moving Magnetic Walls", [national] La 2ème Conférence Nationale sur l’Electronique, le Génie Electrique, les Télécommunications, et la Vision par ordinateur (C3ETCV’24) , Mila-Algeria

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Analytical modeling of magnetic field using a linear hybrid approach with application to permanent magnet synchronous motors

The study presents a novel 2-D hybrid analytical model (HAM) for analyzing dual-rotor permanent-magnet (PM) synchronous machines, integrating semi-analytical Maxwell-Fourier equations with finite-element method (FEM) techniques across all machine regions to provide a thorough and computationally efficient electromagnetic analysis approach. The semi-analytical component employs a rigorous formulation derived from Maxwell's equations, specifically applied for regions with unitary relative permeability. The model applies a finite-element method (FEM) to areas with high magnetic permeability, like the ferromagnetic teeth and yoke components. This approach excels at precisely capturing intricate shapes and variable magnetic behaviors typical of these structures. The analytical model (AM) and finite-element method are connected in both directions of the periodicity and non-periodicity direction. It is found that whatever the iron core relative permeability, the developed hybrid analytical model (HAM) gives accurate results for no-load and on-load conditions. Finiteelement analysis (FEA) shows very good results of the advanced technique.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-11-24), "Analytical modeling of magnetic field using a linear hybrid approach with application to permanent magnet synchronous motors", [national] La 2ème Conférence Nationale sur l’Electronique, le Génie Electrique, les Télécommunications, et la Vision par ordinateur (C3ETCV’24) , Mila-Algeria

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2024-11-07

Application of Cepstral Analysis to The Leaks Detection in Water Distribution Networks

Leakage detection in water distribution systems is an important issue in water resource-saving and management. Inspired by speech and speaker signal processing. In this paper, we apply the cepstrum analysis to identify the leak of the pipeline when this latter occurred. To detect a leak in WDN we consider water flow in pipes similar to the sounds flowing through the vocal tract. The leak can be likened to an opening of the vocal tract, such as the mouth or the nose. A prototype pipeline was made at the laboratory level. The pipeline in our case is made of steel. Experimentally obtained results of the proposed cepstrum methods have been compared to those obtained using three conventional methods: autocorrelation, FFT, and log of FFT. Comparative results prove the effectiveness of the proposed method to track the leaks in different considering cases with very clear peaks and almost in the same frequency (same moment) compared to the three considered methods.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-11-07), "Application of Cepstral Analysis to The Leaks Detection in Water Distribution Networks", [international] Proceedings of International Conference on Studies in Engineering, Science, and Technology (ICSEST) , Istanbul-Turkey

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Empirical Modal Decomposition Applied to Leak Detection in a Water Distribution Pipeline

This paper deals with the problem of water leak detection in the pipeline based on the empirical mode decomposition (EMD) method. At low frequencies, leaks produce acoustic and vibration signals propagating along the pipeline, which have nonlinear and non-stationary characteristics. The hydraulic pressure, pipe diameter, the pipe's nature, and the leak's size can also be considered as other sources of the received signals, with unknown frequencies.rnThe analysis of such leakage signals using conventional methods like the FFT, the correlation, and the cepstrum is limited by the choice of the narrow periods and causes, therefore, the loss of useful information. By accommodating the EMD non-stationary time domain decomposition method, the received signals can be treated separately via several stationary components (IMFs). For some leak positions in
the pipeline, the EMD analysis is applied and compared with the existing leak methods. Working in the time domain analysis, our experimental results demonstrate that the EMD method provides better leak detection
performances.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-11-07), "Empirical Modal Decomposition Applied to Leak Detection in a Water Distribution Pipeline", [international] Proceedings of International Conference on Studies in Engineering, Science, and Technology (ICSEST) , Istanbul-Turkey

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Linear Hybrid Analytical Modeling of Magnetic Fields Applied to Permanent Magnet Synchronous Machine

This work introduces an innovative two-dimensional (2-D) hybrid analytical model (HAM) applied for dual-rotor permanent-magnet (PM) synchronous machines. The proposed HAM seamlessly combines the semi-analytical Maxwell-Fourier formulations with finite-element method (FEM) across all machine subdomains, offering a comprehensive and efficient approach to electromagnetic analysis. The semi-analytical component employs a rigorous formulation derived from Maxwell's equations, specifically tailored for regions with unitary relative permeability, enabling high-precision electromagnetic field computations in nonferromagnetic domains while maintaining computational efficiency. For regions of high magnetic permeability, such as the ferromagnetic teeth and yoke structures, the model employs a finite-element method (FEM) approach, leveraging its superior capability to accurately represent complex geometries and nonlinear magnetic properties. The analytical model (AM) and finite-element method are connected in both directions of the periodicity and non-periodicity direction. It is found that whatever the iron core relative permeability, the developed hybrid analytical model (HAM) give accurate results for no-load and on-load conditions. Finiteelement analysis (FEA) shows very good results of the advanced technique.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-11-07), "Linear Hybrid Analytical Modeling of Magnetic Fields Applied to Permanent Magnet Synchronous Machine", [international] Proceedings of International Conference on Studies in Engineering, Science, and Technology (ICSEST) , Istanbul-Turkey

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2024-10-29

The Influence of the Pinning Sites on the Energy Loss Density in the Dynamic Regime

This study presents a novel approach to simulate magnetization processes using magnetic domain wall motion and domain rotation. The irreversible magnetization changes include the overcoming of pinning sites and crystal impurities that resist shifts in magnetization and require energy expenditure for adjustment. This study is based on the concept of modified magnetic viscosity, taking into account the pinning sites and crystal impurities through a functional approach in conducting media for the inverse Jiles-Atherton model in the dynamic regime. The effectiveness of our approach is demonstrated through comparisons between measured and modeled hysteresis loops across different frequencies.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-10-29), "The Influence of the Pinning Sites on the Energy Loss Density in the Dynamic Regime", [international] First International Conference on Power and Modern Electrical Systems (ICPMES2024) , Skikda-Algeria

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2024-08-27

On-load magnetic field calculation for linear permanent-magnet actuators using hybrid 2-D finite-element method and Maxwell–Fourier analysis

Purpose
The purpose of this study is to present a novel extended hybrid analytical method (HAM) that leverages a two-dimensional (2-D) coupling between the semi-analytical Maxwell–Fourier analysis and the finite element method (FEM) in Cartesian coordinates.

Design/methodology/approach
The proposed model is applied to flat permanent-magnet linear electrical machines with rotor-dual. The magnetic field solution across the entire machine is established by coupling an exact analytical model (AM), designed for regions with relative magnetic permeability equal to unity, with a FEM in ferromagnetic regions. The coupling between AM and FEM occurs bidirectionally (x, y) along the edges separating teeth regions and their adjacent regions through applied boundary conditions.

Findings
The developed HAM yields accurate results concerning the magnetic flux density distribution, cogging force and induced voltage under various operating conditions, including magnetic or geometric parameters. A comparison with hybrid finite-difference and hybrid reluctance network methods demonstrates very satisfactory agreement with 2-D FEM.

Originality/value
The original contribution of this paper lies in establishing a direct coupling between the semi-analytical Maxwell–Fourier analysis and the FEM, particularly at the interface between adjacent regions with differing magnetic parameters.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-08-27), "On-load magnetic field calculation for linear permanent-magnet actuators using hybrid 2-D finite-element method and Maxwell–Fourier analysis", [national] COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , Emerald

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2024-05-13

Thermal Analytical Model of Switched Reluctance Machines

Accordingly, the thermal design of electrical machines in general has become more challenging for the designers. For this reason, to analyze the temperature distribution in these machines, different tools can be used; most of them are the finite element method (FEM) and lumped parameter thermal networks. However, analytical prediction of temperature distribution based on partial differential equation resolution is rare in electrical machines. In this paper, a twodimensional analytical calculation of temperature distribution in steady-state conditions for a switched reluctance machine (SRM) is presented. The analytical model is based on the harmonic modeling technique by using complex Fourier’s series and the separation of variables method. Which take into consideration the different thermal conductivities of the machine parts. In order to validate the proposed analytical method, the results are compared with those found by FEM. The comparisons show good results for the proposed model.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-05-13), "Thermal Analytical Model of Switched Reluctance Machines", [international] 1st International Conference on Renewable Energies and Power Systems (ICREPS'2024) , Naama-Algeria

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2024-05-12

Hybrid Modeling for Permanent-Magnet Synchronous Machines: Exact Analytical Method and Magnetic Equivalent Circuit

The main goal of this study is to provide a hybrid analytical model proposed for permanent magnet synchronous machine in a two-dimensional framework, applicable under no-load and armature reaction current conditions. The model presented in this work combines a two-dimensional exact subdomain approach with a magnetic equivalent circuit (MEC) to precisely compute the magnetic field distribution across all components of the machine being studied. To achieve precise solutions, the two approaches are coupled bidirectionally in r- and θ-direction. The validation through finite element analysis (FEA) further confirms the excellent performance and reliability of the proposed technique.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-05-12), "Hybrid Modeling for Permanent-Magnet Synchronous Machines: Exact Analytical Method and Magnetic Equivalent Circuit", [international] The 2nd International Conference on Electrical Engineering and Automatic Control (ICEEAC’24) , Sétif-Algeria

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2024-05-09

Vibrations des machines tournantes

Actuellement, la dynamique des rotors est un domaine de recherche très actif. Plusieurs hercheurs travail non seulement sur la dynamique linéaire des rotors, mais aussi dans la dynamique non linéaire à vitesses variables et dans le control actif des machines tournantes. Chaque année, de nombreuses conférences et séminaires scientifiques sur la dynamique des rotors sont déroulés. Ainsi que le nombre de documents publiés dans des revues scientifiques spécifiques et des livres augmente d’une manière importante.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-05-09), "Vibrations des machines tournantes", [national] University of M'sila

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TP Automatisme

Automate Programmable Industriel est une machine électronique programmable par un personnel non informaticien et destiné à piloter en ambiance industrielle et en temps réel des procédés industriels. Le développement de l'industrie à entraîner une augmentation constante des fonctions électroniques présentes dans un automatisme c'est pour ça que l'API s'est substituée aux armoires à relais en raison de sa souplesse dans la mise en œuvre, mais aussi parce que dans les coûts de câblage et de maintenance devenaient trop élevés.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-05-09), "TP Automatisme", [national] University of M'sila

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2024-01-23

Semianalytical modeling of squirrel-cage induction machines with consideration of iron permeability and eddy-currents using elementary subdomain technique

Purpose
This paper aims to propose a semianalytical model of a squirrel-cage induction machine (SCIM), considering local magnetic saturation and eddy-currents induced in the rotor bars.

Design/methodology/approach
The regions of the rotor and stator are divided into elementary subdomains (E-SDs) characterized by general solutions at the first harmonic of the magneto-harmonic Maxwell’s equations. These E-SDs are connected in both directions (i.e., along the r- and θ-edges).

Findings
The calculation of the magnetic field has been validated for various values of slip and iron permeability. All electromagnetic quantities were compared with those obtained using a two-dimensional finite-element method. The semianalytical results are satisfactory compared with the numerical results, considering both the amplitude and waveform.

Originality/value
Expansion of the recent analytical model (E-SD technique) for the full prediction of the magnetic field in SCIMs, considering the local saturation effect and the eddy-currents induced in the rotor bars.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2024-01-23), "Semianalytical modeling of squirrel-cage induction machines with consideration of iron permeability and eddy-currents using elementary subdomain technique", [national] COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , Emerald

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2023-11-19

Démarrage automatique d'une pompe électrique sous faible pression d’eau

La présente invention est système de surveillance automatique d’une pompe à eau électrique destinée à l’usage des ménages. Cette invention qui fonctionne sous 220V/50Hz doit être installer avec la pompe à eau et le suppresseur afin qu’elle puisse améliorer la qualité de surveillance de la pompe eau, et tout ça même sous des conditions de fonctionnement sévères comme la perte de la pression de l’eau arrivant du réseau mis en service par l’algérienne des eaux.
L’invention proposée qui fonctionne par l’intelligence artificielle, peut mettre en marche la pompe d’eau sous toutes les conditions imprévues.
Elle peut faire démarrer ou arrêter la pompe à eau, s’assurer qu’il y a de l’eau dans le réseau public, de contrôler le remplissage de la citerne et tant cela sous l’aide d’aucune présence humaine à domicile.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2023-11-19), "Démarrage automatique d'une pompe électrique sous faible pression d’eau", [national] M'sila University

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2023-07-10

Semi-Numerical Magnetic Field Calculation for Synchronous Machines by Using Hybrid Model

This paper proposes a two-dimensional (2-D) hybrid analytical model (HAM) in polar coordinates, combining a 2-D exact subdomain (SD) technique and magnetic equivalent circuit (MEC), for magnetic field calculation in electrical machines at no-load and on-load conditions. The proposed technique proposed in this work is applied to dual-rotor permanent-magnet (PM) synchronous machines. The magnetic field is computed by coupling an exact analytical model (AM), based on the formal resolution of Maxwell's equations applied in subdomain, in regions at unitary relative permeability with a MEC using a nodal-mesh formulation (i.e., Kirchhoff's current law) in ferromagnetic regions. The AM and MEC are connected in both directions of the (non-)periodicity direction. It is found that whatever the iron core relative permeability, the developed HAM give accurate results for no-load and on-load conditions. Finite-element analysis (FEA) demonstrates excellent results of the developed technique.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2023-07-10), "Semi-Numerical Magnetic Field Calculation for Synchronous Machines by Using Hybrid Model", [international] INTERNATIONAL CONFERENCE ON NONLINEAR SCIENCE AND COMPLEXITY , Turkey

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2023-02-23

Hybrid modeling for permanent-magnet electrical machines using Maxwell-Fourier and finite-element method

This paper is the first that proposes an extended hybrid analytical method (HAM) based on a two-dimensional (2-D) coupling between the semi-analytical Maxwell-Fourier analysis and finite-element method (FEM) in polar coordinates. The proposed model is applied to any rotating electrical machines. The main objective of this paper is to establish the magnetic field solution in the whole machine by coupling an exact analytical model (AM), proposed for all regions having relative magnetic permeability equal to unity, with a FEM in ferromagnetic regions. The AM and FEM are coupled in both directions in the edge separating teeth regions and all its adjacent regions by applied boundary conditions (BCs). The developed HAM gives accurate results on the magnetic flux density distribution and the cogging torque whatever the operating conditions, the magnetic or geometric parameters. All results obtained give very satisfactory agreement with 2-D finite-element analysis (FEA).
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2023-02-23), "Hybrid modeling for permanent-magnet electrical machines using Maxwell-Fourier and finite-element method", [national] Electrical Engineering , Springer

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2022

Semi-Analytical Magnetic Field Calculation for Dual-Rotor Permanent-Magnet Synchronous Machines by Using Hybrid Model

Based exclusively on the exact subdomain (SD) technique and finite-difference method (FDM), this article proposes a 2-D hybrid model (HAM) for the semi-analytical magnetic field calculation in electrical machines at no-/on-load conditions. It is applied to dual-rotor permanent-magnet (PM) synchronous machines. The magnetic field is computed by solving Laplace’s and Poisson’s equations through exact SD technique in all regions at unitary relative permeability (i.e., PMs, air gap, and slots) with a numerical model based on FDM in ferromagnetic regions (i.e., teeth and rotor/stator yokes). These two models are specifically coupled in both directions (i.e., r- and θ-edges) of the (non-)periodicity direction (i.e., in the interface between teeth regions and all its adjacent regions as slots and/or air gap). To provide accurate solutions, the current density distribution in slots regions is modeled by using Maxwell’s equations. The finite-element analysis (FEA) demonstrates highly accurate results of the developed technique. The 2-D HAM is ≈6 times faster than 2-D FEA.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2022), "Semi-Analytical Magnetic Field Calculation for Dual-Rotor Permanent-Magnet Synchronous Machines by Using Hybrid Model", [national] IEEE TRANSACTIONS ON MAGNETICS , IEEE

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2021

2-D Semi-Analytical Magnetic Field Calculation for Flat Permanent-Magnet Linear Machines Using Exact Subdomain Technique

This article proposes an extended linear analytical solution based on the exact subdomain (SD) technique applied to any flat linear electromagnetic device for no-load and armature reaction current conditions. A slotted linear synchronous machine with surface-mounted permanent magnet (PM) having Halbach magnetization is proposed in this article. The magnetic field derived from the formal solution of Maxwell’s equations is calculated by solving Laplace’s and Poisson’s equations on a 2-D Cartesian system. The magnetic field distribution is determined in all regions by considering the finite magnetic permeability of soft-magnetic materials in iron parts. It was performed for two different values of iron core relative permeability (viz., 2 and 1000). Finite-element analysis (FEA) demonstrates excellent results of the developed technique.
Citation

M. LADGHEM-CHIKOUCHE Brahim, Kamel Boughrara, Frédéric Dubas, Rachid Ibtiouen, , (2021), "2-D Semi-Analytical Magnetic Field Calculation for Flat Permanent-Magnet Linear Machines Using Exact Subdomain Technique", [national] IEEE TRANSACTIONS ON MAGNETICS , IEEE

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Analytical magnetic field calculation for flat permanent-magnet linear machines with dual-rotor by using improved two-dimensional hybrid analytical method

Purpose – This paper aims to propose an improved two-dimensional hybrid analytical method (HAM) in Cartesian coordinates, based on the exact subdomain technique and the magnetic equivalent circuit (MEC).
Design/methodology/approach – The magnetic field solution is obtained by coupling an exact analytical model (AM), calculated in all regions having relative permeability equal to unity, with a MEC, using a nodal-mesh formulation (i.e. Kirchhoff’s current law) in ferromagnetic regions. The AM and MEC are connected in both axes (x, y) of the (non-)periodicity direction (i.e. in the interface between the tooth regions and all its adjacent regions as slots and/or air-gap). To provide accuracy solutions, the current density distribution in slot regions is modeled by using Maxwell’s equations instead of the MEC characterized by an equivalent magnetomotive force (MMF) located in slots, teeth and yokes.
Findings – It is found that whatever the iron core relative permeability, the developed HAM gives accurate results for no- and on-load conditions. The finite-element analysis demonstrates excellent results of the developed technique.
Originality/value – The main objective of this paper is to make a direct coupling between the AM and MEC in both directions (i.e. x- and y-edges). The current density distribution is modeled by using Maxwell’s equations instead of the MEC and characterized by an MMF.
Citation

M. LADGHEM-CHIKOUCHE Brahim, Kamel Boughrara, Frédéric Dubas, Rachid Ibtiouen, , (2021), "Analytical magnetic field calculation for flat permanent-magnet linear machines with dual-rotor by using improved two-dimensional hybrid analytical method", [national] COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , Emerald

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Two-dimensional hybrid model for magnetic field calculation in electrical machines: exact subdomain technique and magnetic equivalent circuit

Purpose – The purpose of this paper is to propose a two-dimensional (2-D) hybrid analytical model (HAM) in polar coordinates, combining a 2-D exact subdomain (SD) technique and magnetic equivalent circuit (MEC), for the magnetic field calculation in electrical machines at no-load and on-load conditions.
Design/methodology/approach – In this paper, the proposed technique is applied to dual-rotor permanent magnet (PM) synchronous machines. The magnetic field is computed by coupling an exact analytical model (AM), based on the formal resolution of Maxwell’s equations applied in subdomains, in regions at unitary relative permeability with a MEC, using a nodal-mesh formulation (i.e. Kirchhoff’s current law), in ferromagnetic regions. The AM and MEC are connected in both directions (i.e. r- and theta-edges) of the (non-)periodicity direction (i.e. in the interface between teeth regions and all its adjacent regions as slots and/or air-gap). To provide accurate solutions, the current density distribution in slot regions is modeled by using Maxwell’s equations instead to MEC and characterized by an equivalent magnetomotive force (MMF) located in the slots, teeth and yoke.
Findings – It is found that whatever the iron core relative permeability, the developed HAM gives accurate results for both no-load and on-load conditions. Finite element analysis demonstrates the excellent results of the developed technique.
Citation

M. LADGHEM-CHIKOUCHE Brahim, Kamel Boughrara, Dubas Frédéric, Rachid Ibtiouen, , (2021), "Two-dimensional hybrid model for magnetic field calculation in electrical machines: exact subdomain technique and magnetic equivalent circuit", [national] COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , Emerald

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Magnetic Field Calculation for Flat Permanent-Magnet Linear Machines Using a Hybrid Analytical Model

This paper proposes an improved two-dimensional (2-D) hybrid analytical method (HAM) in Cartesian coordinates, based on the exact subdomain (SD) technique and the finite-difference method (FDM). It is applied to flat permanent-magnet (PM) linear machines with dual-rotor. The magnetic field solution is obtained by coupling an exact SD model, calculated in all regions having relative permeability equal to unity, with FDM in ferromagnetic regions. The analytical model and FDM are connected in both axes (𝒙, 𝒚) of the (non-)periodicity direction (i.e., in the interface between the tooth regions and all its adjacent regions as slots and/or air-gap). To provide accuracy solutions, the current density distribution in slot regions is modeled by using Maxwell’s equations. It is found that, whatever the iron core magnetic parameters, the developed HAM gives accurate results for no- and on-load conditions. Finite-element analysis (FEA) demonstrates excellent results of the developed technique.
Citation

M. LADGHEM-CHIKOUCHE Brahim, Kamel Boughrara, Frédéric Dubas, Lazhar Roubache, Rachid Ibtiouen, , (2021), "Magnetic Field Calculation for Flat Permanent-Magnet Linear Machines Using a Hybrid Analytical Model", [national] ENP Engineering Science Journal , ENP

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2019

Machines électriques Approfondies

Ce cours s’adresse aux étudiants de la première année Master. L'objectif essentiel de ce cours est de partager aux étudiants toutes les informations essentielles qui touches le calcul des performances des machines électriques à courant alternatif. Le cours est composé de plusieurs chapitres, mais l’essentiel est de comprendre bien le principe de la conversion électromécanique.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2019), "Machines électriques Approfondies", [national] Université Mohamed Boudiaf de M'sila

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Analytical approach for spoke-type permanent magnet machine including finite permeability of iron core

Purpose – The purpose of this study is the introduction of finite permeability of ferromagnetic core in analytical approach for slotted spoke-type permanent magnet machine.
Design/methodology/approach – A two-dimensional analytical approach of magnetic field distribution is established for spoke-type permanent magnet machine to calculate the flux density distribution in the middle of airgap. The paper presents an analytical subdomain model accounting for stator slotting effect. The governing equations are obtained from Maxwell’s equations by using vector potential in all regions of the machine, i.e. magnet, airgap, stator slots and rotor/stator yoke. The finite element analysis is used to validate the analytical results.
Findings – It is found that the developed subdomain model including finite permeability of ferromagnetic core is accurate and is applicable for spoke-type permanent magnet machine for no-load and on-load condition. The analytical results are in accurate agreement with the numerical simulation.
Originality/value – Some assumptions and conditions are presented to improve and simplify the analytical method for analyzing the global saturation for spoke-type permanent magnet machine.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2019), "Analytical approach for spoke-type permanent magnet machine including finite permeability of iron core", [national] COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , Emerald Publishing Limited

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New Analytical model for PMSM Analysis Considering Finite Soft-Magnetic Material Permeability

This paper presents a simplified analytical method to predict the influence of magnetic finite permeability of iron core on machine's parameters of a surface mounted permanent magnet synchronous machine. On the open circuit, two-dimensional field distributions produced by permanent magnets synchronous machine (PMSM) are obtained in analytical approach forms by taking into account the relative permeability value of a ferromagnetic rotor and stator core. The final analytical solution in different regions is given by applying boundary and interface conditions of the proposed machine. Analytical method is verified by the finite-element analysis (FEA).
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2019), "New Analytical model for PMSM Analysis Considering Finite Soft-Magnetic Material Permeability", [international] The Electrical Engineering International Conference EEIC’19 , Bejaia, Algeria

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Impact of Magnetic Slot Wedges on PMSM Performances Using Analytical Model

This work deals with the influence of magnetic finite permeability of soft-magnetic material on machine’s parameters of a surface mounted permanent magnet synchronous machine. On the open circuit, two-dimensional field distributions produced by permanent magnets synchronous machine (PMSM) are obtained in analytical approach forms by taking into account the relative permeability value of a ferromagnetic rotor and stator core. 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)
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2019), "Impact of Magnetic Slot Wedges on PMSM Performances Using Analytical Model", [international] 5TH INTERNATIONAL CONFERENCE ON ADVANCES IN MECHANICAL ENGINEERING ISTANBUL 2019, 17-19 DECEMBER 2019, JOINT CONFERENCE OF YTU AND ASHRAE , Istanbul, Turquie

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Analytical model for PMSM Analysis Including Finite Soft-Magnetic Material Permeability

This paper presents a simplified analytical method to predict the influence of magnetic finite permeability of iron core on machine’s parameters of a surface mounted permanent magnet synchronous machine. On the open circuit, two-dimensional field distributions produced by permanent magnets synchronous machine (PMSM) are obtained in analytical approach forms by taking into account the relative permeability value of a ferromagnetic rotor and stator core. The analytical solution is given by applying boundary and interface conditions in each region of the proposed machine. Analytical method is verified by the finite-element analysis (FEA).
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2019), "Analytical model for PMSM Analysis Including Finite Soft-Magnetic Material Permeability", [international] 11th INTERNATIONAL CONFERENCE on ELECTRICAL and ELECTRONICS ENGINEERING Bursa, Turkey, 28-30 November 2019 , Bursa, Turquie

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2018

Permanent Magnet Shaping for Cogging Torque and Torque Ripple Reduction of PMSM

Purpose - This paper aims to the improvement of permanent magnet shape in the popular permanent magnet synchronous machine (PMSM) is proposed in this paper in view to mitigate cogging torque magnitude and torque ripple.
Design/methodology/approach - A two-dimensional exact analytical approach of magnetic field distribution is established for the PMSM considering magnet shape and slot opening. The optimal magnet shape is constituted of small number of layers stacked radially. The thickness of each magnet layer is considered equal to about one mm or more; however, a parametric study was performed to determine pole pitch ratio value. The finite element method is used to validate the analytical results.
Findings - Cogging torque peaks and torque ripples can be mitigated significantly more than 90 per cent compared to results issued from machine having classical magnet shape. Raising the number of magnet layers can give better results. The results of this paper are compared also with those issued from the machine having sinusoidal magnet shape and give a good solution.
Originality/value - A new technique for cogging torque and torque ripple mitigation is proposed in this paper by changing permanent magnet shape. The proposed final magnet shape is constituted of a set of stacked and well-dimensioned layers relative to the opening angle.
Citation

M. LADGHEM-CHIKOUCHE Brahim, Kamel Boughrara, Rachid Ibtiouen, , (2018), "Permanent Magnet Shaping for Cogging Torque and Torque Ripple Reduction of PMSM", [national] COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , Emerald Publishing Limited

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PRE-DIMENSIONNEMENT DE MACHINES SYNCHRONES A ENTREFER LISSE ET A AIMANTS PERMANENTS MONTES SUR LA SURFACE ROTORIQUE

Ce travail porte sur le prédimensionnement des machines synchrones à aimants permanents montés sur la surface du rotor. L’objectif est de réduire le couple de détente et les ondulations du couple résultant.
Les approches de calcul, adoptées au niveau de notre étude, pour déterminer la distribution du champ magnétique au niveau des aimants, de l’entrefer et des encoches sont basées sur les équations de Maxwell. Une première approche analytique (sous domaines) est développée. Elle permet un calcul précis des paramètres géométriques de la machine en régime linéaire. Pour tenir compte de la saturation des matériaux ferromagnétiques, une deuxième approche est développée. Celle-ci fait appel au modèle analytique de la première approche et aux réseaux de perméances.
Le prédimensionnement de machines synchrones à aimants dits « biseautés » est effectué. Cette structure d’aimants est favorable à la réduction de l’amplitude du couple de détente. Deux configurations géométriques ont été retenues. Le choix de l’une par rapport à l’autre dépend des paramètres géométriques de la machine parmi lesquels le nombre de paires de pôles et le nombre d’encoches statoriques. Deux autres structures d’aimants (dites multicouches) montés à la surface du rotor de machines synchrones à entrefer lisse sont pré-dimensionnées. Leurs performances sont comparées avec celles obtenues par d’autres machines de structures similaires.
La validité des modèles développés est vérifiée en comparant les résultats obtenus avec ceux issus d’un logiciel basé sur la méthode des éléments finis.
Citation

M. LADGHEM-CHIKOUCHE Brahim, (2018), "PRE-DIMENSIONNEMENT DE MACHINES SYNCHRONES A ENTREFER LISSE ET A AIMANTS PERMANENTS MONTES SUR LA SURFACE ROTORIQUE", [national] Ecole Nationale Polytechnique ENP

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2015

Cogging Torque Minimization of Surface-Mounted Permanent Magnet Synchronous Machines Using Hybrid Magnet Shapes

This paper deals with the magnet pole shape design for the minimization of cogging torque in permanent magnet synchronous machines (PMSM). New shapes of permanent magnet are proposed. The magnet shape is modeled analytically by a set of stacked and well dimensioned layers relatively to the height and opening angle. The final shape of magnet is configured by using three models in view of obtaining lower magnitude of cogging torque. A 2-D exact analytical solution of magnetic field distribution taking into account the shape of magnet, the irregular mechanical thickness of air-gap and semi-closed stator slots is established. The influence of motor’s parameters such as the number of stator slots per pole and per phase and PM’s magnetization on cogging torque is discussed. Analytical results are validated by the static finite-element method (FEM)
Citation

M. LADGHEM-CHIKOUCHE Brahim, Kamel Boughrara, Rachid Ibtiouen, , (2015), "Cogging Torque Minimization of Surface-Mounted Permanent Magnet Synchronous Machines Using Hybrid Magnet Shapes", [national] Progress In Electromagnetics Research B , /

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Analytical Design of PMSMs by Using Magnets Bars With Different Remanences

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).
Citation

M. LADGHEM-CHIKOUCHE Brahim, Kamel Boughrara, Kamel Boughrara, , (2015), "Analytical Design of PMSMs by Using Magnets Bars With Different Remanences", [international] Conference en Electrical Machines & Power Electronics (ACEMP) , Side, Turquie

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