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  • Study on the characteristics of superconducting electrodynamic suspension system based on dynamic circuit theory
    COMPEL (IF 0.59) Pub Date : 2021-01-04
    Daoyu Hu; Maochun Zhai

    Purpose The purpose of this paper is to analyze the influence of different parameters on the characteristics of the superconducting electrodynamic suspension (EDS) system. Design/methodology/approach The authors used an analytical model based on the dynamic circuit theory to perform the analysis. The authors proposed an inductance criterion to improve the calculation accuracy. They also proposed a

  • Impacts of using wide bandgap transistors on electronics and motors
    COMPEL (IF 0.59) Pub Date : 2020-12-28
    Mathieu Gerber; Guillaume Callerant; Christophe Espanet; Farid Meibody-Tabar; Noureddine Takorabet

    Purpose The purpose of this paper is to study the high-frequency impacts of fast switching wide-bandgap transistors on electronic and motor designs. The high-frequency power converters, dedicated to driving high-speed motors, require specific models to design predictively electronic and motors. Design/methodology/approach From magnetic and electric models, the high-frequency parasitic elements for

  • Development of mathematical model and circuit emulators for four lobe memristive behaviour
    COMPEL (IF 0.59) Pub Date : 2020-12-30
    Kapil Bhardwaj; Mayank Srivastava

    Purpose This paper aims to develop a mathematical model for four-lobe memristor (FLM) element. The four-lobe memristive behaviour can be used in realization of hyperchaotic oscillators and implementation of multi-bit memories. For verification of the developed mathematical framework, two FLM circuit emulators have been presented using VDCC and IC LM13700, respectively. Design/methodology/approach A

  • An alternative method for field analysis in inhomogeneous domains
    COMPEL (IF 0.59) Pub Date : 2021-01-04
    Stefano Costa; Eugenio Costamagna

    Purpose This paper aims to solve inhomogeneous dielectric problems by matching boundary conditions at the interfaces among homogeneous subdomains. The capabilities of Hilbert transform computations are deeply investigated in the case of limited numbers of samples, and a refined model is presented by means of investigating accuracies in a case study with three subdomains. Design/methodology/approach

  • Adjoint-based topology optimization to reduce the energy consumption of a Hall effect thruster
    COMPEL (IF 0.59) Pub Date : 2020-12-31
    Rtimi Youness; Frederic Messine

    Purpose The presented study aims to minimize the energy consumed by a Hall effect thruster (HET) under a constraint which makes it possible to generate a specified magnetic field in a target region of the thruster. Design/methodology/approach Herein topology optimization (TO) is used to reduce the energy consumption of an HET while keeping its performance unchanged. The design variables are the current

  • Image reconstruction by solving the inverse problem in ultrasonic transmission tomography system
    COMPEL (IF 0.59) Pub Date : 2020-12-31
    Tomasz Rymarczyk; Konrad Kania; Michał Gołąbek; Jan Sikora; Michał Maj; Przemysław Adamkiewicz

    Purpose The purpose of this study is to develop a reconstruction and measurement system for data analysis using ultrasonic transmission tomography. The problem of reconstruction from the projection is encountered in practical implementation, which consists in reconstructing an image that is an estimation of an unknown object from a finite set of projection data. Reconstructive algorithms used in transmission

  • FEM using projection of physical properties suitable for movement modeling and optimization processes
    COMPEL (IF 0.59) Pub Date : 2020-11-23
    Baptiste Ristagno; Dominique Giraud; Julien Fontchastagner; Denis Netter; Noureddine Takorabet; Geoffrey Devornique; Nicolas Labbe

    Purpose Optimization processes and movement modeling usually require a high number of simulations. The purpose of this paper is to reduce global central processing unit (CPU) time by decreasing each evaluation time. Design Methodology Approach Remeshing the geometry at each iteration is avoided in the proposed method. The idea consists in using a fixed mesh on which functions are projected to represent

  • Diagnosis of brushless synchronous generator using numerical modeling
    COMPEL (IF 0.59) Pub Date : 2020-11-30
    Mehdi Rahnama; Abolfazl Vahedi; Arta Mohammad-Alikhani; Noureddine Takorabet

    Purpose On-time fault diagnosis in electrical machines is a critical issue, as it can prevent the development of fault and also reduce the repairing time and cost. In brushless synchronous generators, the significance of the fault diagnosis is even more because they are widely used to generate electrical power all around the world. Therefore, this study aims to propose a fault detection approach for

  • Impact of the load angle on magnetic radial pressure and torque ripple of a low power PMSM with trapezoidal control
    COMPEL (IF 0.59) Pub Date : 2020-11-30
    Emre Uygun; Daniel Depernet; Vincent Lanfranchi; Serge Bruno; Thierry Tollance; Michel Hecquet; Abdelmounaïm Tounzi

    Purpose This paper deals with the study of the influence of the phase shift between currents and back-electromotive forces (back-EMF) on torque ripple and radial magnetic forces for a low power synchronous machine supplied with 120 degrees square-wave currents. This paper aims to establish a good compromise between efficiency, harmonics of torque and harmonics of radial forces at the origin of the

  • A novel direct resolution method for coupled systems in finite element analysis
    COMPEL (IF 0.59) Pub Date : 2020-11-30
    Youcef Boutora; Noureddine Takorabet

    Purpose This paper aims to propose a novel direct method for indefinite algebraic linear systems. It is well adapted for sparse linear systems, such as those of two-dimensional (2-D) finite elements problems, especially for coupled systems. Design/methodology/approach The proposed method is developed on an example of an indefinite symmetric matrix. The algorithm of the method is given next, and a comparison

  • Design optimization of metamaterial units using a genetic algorithm based optimization methodology
    COMPEL (IF 0.59) Pub Date : 2020-11-30
    Yiying Li; Shiyou Yang

    Purpose The purpose of this paper is to develop a pertinent design optimization methodology for symmetric designs of a metamaterial (MM) unit. Design/methodology/approach A cell division mechanism is introduced and used to design a new selecting mechanism in the proposed algorithm, a non-dominated sorting cellular genetic algorithm (NSCGA). Findings The numerical results on solving standard multi-objective

  • Use of current sheet coupled to an analytical tool to analyze by FEM the harmonic content of armature winding ditribution
    COMPEL (IF 0.59) Pub Date : 2020-11-30
    Jérôme Marault; Abdelmounaïm Tounzi; Frédéric Gillon; Michel Hecquet

    Purpose For a given rotor, the study of the impact of stator MMF from different winding distributions is usually carried out using analytical model under some simplifying hypotheses to limit time computation. To get more accurate results, finite element model is thus more suitable. However, testing different combinations of stator windings with the same rotor can be tedious when considering the stator

  • On accuracy of a mutually coupled ladder network model high-frequency parameters identification for a transformer winding using gray wolf optimizer method
    COMPEL (IF 0.59) Pub Date : 2020-11-30
    Abdallah Chanane; Messaoud Belazzoug

    Purpose It is not a secret that the identification of the high-frequency ladder network model (LNM) parameters for the transformer winding is a crucial task. This paper aims to present the application of one of the latest swarm intelligence algorithms, namely, gray wolf optimizer (GWO) for the identification of the high-frequency LNM parameters for the transformer winding. Design/methodology/approach

  • Neural control of robot manipulators considering motor voltage saturation: performance evaluation and experimental validation
    COMPEL (IF 0.59) Pub Date : 2020-11-30
    Alireza Izadbakhsh; Saeed Khorashadizadeh

    Purpose This paper aims to design a neural controller based on radial basis function networks (RBFN) for electrically driven robots subjected to constrained inputs. Design/methodology/approach It is assumed that the electrical motors have limitations on the applied voltages from the controller. Due to the universal approximation property of RBFN, uncertainties including un-modeled dynamics and external

  • Moore-Penrose pseudo-inverse and artificial neural network modeling in performance prediction of switched reluctance machine
    COMPEL (IF 0.59) Pub Date : 2020-11-23
    Ana Camila Ferreira Mamede; José Roberto Camacho; Rui Esteves Araújo; Igor Santos Peretta

    Purpose The purpose of this paper is to present the Moore-Penrose pseudoinverse (PI) modeling and compare with artificial neural network (ANN) modeling for switched reluctance machine (SRM) performance. Design/methodology/approach In a design of an SRM, there are a number of parameters that are chosen empirically inside a certain interval, therefore, to find an optimal geometry it is necessary to define

  • An improved model for performances calculation in spoke-type permanent-magnet machines considering magnetization orientation and finite soft-magnetic material permeability
    COMPEL (IF 0.59) Pub Date : 2020-11-11
    Ali Jabbari; Frédéric Dubas

    Purpose In semi-analytical modeling of spoke-type permanent-magnet (PM) machines (STPMM), the saturation effect is usually neglected (i.e. iron parts are considered to be infinitely permeable) and the PM magnetization is assumed tangential (i.e. magnetization pattern is considered to be tangential-parallel). This paper aims to present an improved two-dimensional (2D) subdomain technique for STPMM with

  • A novel matrix based systematic approach for vulnerability assessment
    COMPEL (IF 0.59) Pub Date : 2020-11-04
    Hamed Sabouhi; Aref Doroudi; Mahmud Fotuhi-Firuzabad; Mahdi Bashiri

    Purpose This paper aims to propose a novel matrix-based systematic approach for vulnerability assessment. Design/methodology/approach The proposed method consists of two major steps. First, the power network is modeled as a topological combination of edges (transmission lines, transformers, etc.) and nodes (buses, substations, etc.). The second step is to use an axiomatic design-based index for topology

  • A transform of univariable time domain polynomial for extraction of temporal arcs
    COMPEL (IF 0.59) Pub Date : 2020-10-16
    Binesh Thankappan

    Purpose This paper aims to present a special transformation that is applied to univariable polynomials of an arbitrary order, resulting in the generation of the proposed offset eliminated polynomial. This transform-based approach is used in the analysis and synthesis of temporal arc functions, which are time domain polynomial functions possessing two or more values simultaneously. Using the proposed

  • Predicting formulae for effective length of counterpoise wires buried in ionized, dispersive and inhomogeneous soils
    COMPEL (IF 0.59) Pub Date : 2020-09-28
    Seyyed Sajjad Sajjadi; Saeed Reza Ostadzadeh

    Purpose The purpose of this paper is to investigate the ionization and dispersion effects in combination with the inhomogeneity of soil simultaneously on the effective lengths of counterpoise wires. Design/methodology/approach Improved multi-conductor transmission line model is used for computing effective length of counterpoise wires considering all aspects of soils. Findings The simulation results

  • PMSM speed control based on intelligent sliding mode technique
    COMPEL (IF 0.59) Pub Date : 2020-09-24
    Jafar Tavoosi

    Purpose The purpose of this paper is to present a novel intelligent backstepping sliding mode control for an experimental permanent magnet synchronous motor. Design/methodology/approach A novel recurrent radial basis function network (RBFN) is used to is used to approximate unknown nonlinear functions in permanent magnet synchronous motor (PMSM) dynamics. Then, using the functions obtained from the

  • Performance assessment of controller designed for electrical systems with second order dynamics
    COMPEL (IF 0.59) Pub Date : 2020-09-18
    K. Ghousiya Begum

    Purpose An assessment technique that analyzes the servo and regulatory characteristics of the proportional integral derivative controller is designed for time-delayed second-order stable processes. Design/methodology/approach The minimum theoretical error expression for integral of the absolute errors (IAE_o) is obtained from the preferred servo and regulatory transfer functions dependent on the step

  • A constraint-based optimization technique for estimating physical parameters of Jiles – Atherton hysteresis model
    COMPEL (IF 0.59) Pub Date : 2020-08-24
    Brijesh Upadhaya; Paavo Rasilo; Lauri Perkkiö; Paul Handgruber; Anouar Belahcen; Antero Arkkio

    Purpose Improperly fitted parameters for the Jiles–Atherton (JA) hysteresis model can lead to non-physical hysteresis loops when ferromagnetic materials are simulated. This can be remedied by including a proper physical constraint in the parameter-fitting optimization algorithm. This paper aims to implement the constraint in the meta-heuristic simulated annealing (SA) optimization and Nelder–Mead simplex

  • A novel and accurate analytical-numerical method for inrush current modeling of three-limb power transformers
    COMPEL (IF 0.59) Pub Date : 2020-07-14
    Mohammad Ali Taghikhani; Zahra Taghikhani

    Purpose Using appropriate solution techniques for transformer inrush current transient study is of great prominence owing to the inevitable inclusion of differential equations leading to complicated analysis procedures. This study aims to propose an analytical-numerical method to accurately analyze the three-phase three-limb core-type transformer inrush current in different cases considering the nonlinear

  • Application of discrete differential operators of periodic functions to solve 1D boundary-value problems
    COMPEL (IF 0.59) Pub Date : 2020-07-11
    Tadeusz Sobczyk; Marcin Jaraczewski

    Purpose Discrete differential operators (DDOs) of periodic functions have been examined to solve boundary-value problems. This paper aims to identify the difficulties of using those operators to solve ordinary nonlinear differential equations. Design/methodology/approach The DDOs have been applied to create the finite-difference equations and two approaches have been proposed to reduce the Gibbs effects

  • Switching harmonic suppression design based on multi-objective optimization algorithm with constraint processing
    COMPEL (IF 0.59) Pub Date : 2020-07-13
    Songtao Huang; Jie Ye; Haozhe Wang; Baojin Li; Anwen Shen; Junli Deng

    Purpose Traditional switching harmonic suppressor design methods require domain experts to adjust design parameters due to various complex performance requirements and practical limitations in switching ripple suppressor designs. The purpose of this paper is to present a method for filter parameter design. Design/methodology/approach An improved non-dominated sorting genetic algorithm II (NSGA II)

  • Effect of magnetic slot wedge on the performance of bulb tubular turbine generator
    COMPEL (IF 0.59) Pub Date : 2020-07-22
    Hongbo Qiu; Xutian Zou; Xiaobin Fan

    Purpose Owing to the salient pole structure and stator slots of hydro-generator, the air gap magnetic field in the generator is unevenly distributed. High-frequency harmonic components contained in the inhomogeneous air gap magnetic field will have a negative impact on the generator performance. The purpose of this paper, therefore, is to improve the distribution of air gap magnetic field by using

  • CSF-PC based grid tied improved hybrid three quasi Z source converter
    COMPEL (IF 0.59) Pub Date : 2020-08-03
    Ramanjaneyulu Alla; Anandita Chowdhury

    Purpose A new control method is proposed for grid integration of improved hybrid three quasi z source converter (IHTQZSC). The proposed controller provides a constant switching frequency with an improved dynamic response with fewer computations. The proposed constant switching frequency predictive controller (CSF-PC) does not need weighting factors and reduces the complexity of the control circuit

  • Application of new algorithms on asymmetric cascaded multilevel inverter
    COMPEL (IF 0.59) Pub Date : 2020-07-24
    Ashraf Yahya; Syed M. Usman Ali; Muhammad Farhan Khan

    Purpose Multilevel inverter (MLI) is an established design approach for inverter applications in medium-voltage and high-voltage range of applications. An asymmetric design synthesizes multiple DC input voltage sources of unequal magnitudes to generate a high-quality staircase sinewave comprising a large number of steps or levels. However, the implications of using sources of unequal magnitudes results

  • Investigation of convolutional neural network U-net under small datasets in transformer magneto-thermal coupled analysis
    COMPEL (IF 0.59) Pub Date : 2020-08-03
    Ruohan Gong; Zuqi Tang

    Purpose This paper aims to investigate the approach combine the deep learning (DL) and finite element method for the magneto-thermal coupled problem. Design/methodology/approach To achieve the DL of electrical device with the hypothesis of a small dataset, with ground truth data obtained from the FEM analysis, U-net, a highly efficient convolutional neural network (CNN) is used to extract hidden features

  • Real-time transient stability assessment using stacked auto-encoders
    COMPEL (IF 0.59) Pub Date : 2020-08-12
    Masoud Azarbik; Mostafa Sarlak

    Purpose This paper aims to report how one can assess the transient stability of a power system by using stacked auto-encoders. Design/methodology/approach The proposed algorithm works in a power system equipped with the wide area measurement system. To be more exact, it needs pre- and post-disturbance values of frequency sent from phasor measurement units. Findings The authors have investigated the

  • Steklov approximations of Green’s functions for Laplace equations
    COMPEL (IF 0.59) Pub Date : 2020-08-12
    Manki Cho

    Purpose This paper aims to present a meshless technique to find the Green’s functions for solutions of Laplacian boundary value problems on rectangular domains. This paper also investigates a theoretical basis for the Steklov series expansion methods to reduce and estimate the error of numerical approaches for the boundary correction kernel of the Laplace operator. Design/methodology/approach The main

  • Characterization of rotor losses in permanent magnet machines
    COMPEL (IF 0.59) Pub Date : 2020-07-27
    Antomne Caunes; Noureddine Takorabet; Sisuda Chaithongsuk; Laurent Duranton

    Purpose The purpose of this paper is to present a synthesis of the analysis and modeling of the rotor losses in high speed permanent magnets motors. Design/methodology/approach Three types of losses are as a result of eddy currents in the conductive parts of the rotor. The analysis includes their characterization and the setup of a numerical model using finite element method. The adopted methodology

  • Irreversible demagnetization analysis of RWAFPM motor using modified MEC algorithm
    COMPEL (IF 0.59) Pub Date : 2020-07-22
    Farshid Mahmouditabar; Abolfazl Vahedi; Pourya Ojaghlu; Noureddine Takorabet

    Purpose This paper aims to present a modified MEC algorithm for demagnetization modeling of the PM motor. One of the major issues that the designers of the permanent magnet (PM) motors are faced with is the demagnetization of magnets because of high temperatures and armature reaction. Demagnetization will weaken the magnetic properties of the magnet and lead to a reduction in the performance of the

  • Analysis of electrical circuits supplied by sequence of impulses
    COMPEL (IF 0.59) Pub Date : 2020-07-13
    Zhivko Georgiev; Ivan Trushev

    Purpose This paper aims to analyze transient and steady state processes in series resistive capacitive-circuits when the supplied voltage is a sequence of periodic rectangular pulses. The purpose is to obtain an analytical formula for the capacitor voltage at any instant of time, both for the transient and the steady-state processes. Design/methodology/approach The main approach is to use a combination

  • A thermal extension and loss model for Tellinen’s hysteresis model
    COMPEL (IF 0.59) Pub Date : 2020-06-25
    Jan Kühn; Andreas Bartel; Piotr Putek

    Purpose The thermally extended Tellinen model (Kühn et al., to appear) is here investigated and equipped with a hysteresis loss model, while preserving its simple structure. Design/methodology/approach As in the original model, these approaches are based upon phenomenal observations and measured saturation curves. The authors start with the original model and step-by-step add their extensions, such

  • Analytical solution of the Duffing equation
    COMPEL (IF 0.59) Pub Date : 2020-06-25
    Zhivko Georgiev; Ivan Trushev; Todor Todorov; Ivan Uzunov

    Purpose The purpose of this paper is to find an exact analytical expression for the periodic solutions of the double-hump Duffing equation and an expression for the period of these solutions. Design/methodology/approach The double-hump Duffing equation is presented as a Hamiltonian system and a phase portrait of this system has been found. On the ground of analytical calculations performed using Hamiltonian-based

  • Parameter identification of solar cells and fuel cell using improved social spider algorithm
    COMPEL (IF 0.59) Pub Date : 2020-06-30
    Hadi Kashefi; Ahmad Sadegheih; Ali Mostafaeipour; Mohammad Mohammadpour Omran

    Purpose To design, control and evaluate photovoltaic (PV) systems, an accurate model is required. Accuracy of PV models depends on model parameters. This study aims to use a new algorithm called improved social spider algorithm (ISSA) to detect model parameters. Design/methodology/approach To improve performance of social spider algorithm (SSA), an elimination period is added. In addition, at the beginning

  • Transcranial ultrasonic propagation and enhanced brain imaging exploiting the focusing effect of the skull
    COMPEL (IF 0.59) Pub Date : 2020-06-05
    Stamatis A. Amanatiadis; Georgios K. Apostolidis; Chrysanthi S. Bekiari; Nikolaos V. Kantartzis

    Purpose The reliable transcranial imaging of brain inner structures for diagnostic purposes is deemed crucial owing to the decisive importance and contribution of the brain in human life. The purpose of this paper is to investigate the potential application of medical ultrasounds to transcranial imaging using advanced techniques, such as the total focussing method. Design/methodology/approach Initially

  • An adaptive sparse polynomial-chaos technique based on anisotropic indices
    COMPEL (IF 0.59) Pub Date : 2020-05-21
    Christos Salis; Nikolaos V. Kantartzis; Theodoros Zygiridis

    Purpose The fabrication of electromagnetic (EM) components may induce randomness in several design parameters. In such cases, an uncertainty assessment is of high importance, as simulating the performance of those devices via deterministic approaches may lead to a misinterpretation of the extracted outcomes. This paper aims to present a novel heuristic for the sparse representation of the polynomial

  • Transient performance of a magnetically geared induction machine
    COMPEL (IF 0.59) Pub Date : 2020-07-16
    Badr-El-Boudour Bidouche; Thierry Lubin; Smaïl Mezani

    Purpose The purpose of this paper is to investigate the transient performance of an induction machine coupled with a magnetic gear for industrial applications with low speed and high torque requirements. This new solution increases mechanical reliability and does not require maintenance and lubrication. The main objective is to study the direct-on-line starting ability of the electrical machine and

  • 3-D adaptive FEA with weighted node density technique
    COMPEL (IF 0.59) Pub Date : 2020-07-15
    Tadashi Yamaguchi; Yoshihiro Kawase; Shota Ishimura

    Purpose This paper aims to propose a method to create 3-D finite element meshes automatically using the Delaunay tetrahedralization with the weighted node density technique. Using this method, the adaptive finite element analysis (FEA) was carried out for the calculation of the magnetic field of an eddy current verification model to clarify the usefulness of the method. Moreover, the error evaluation

  • Axial claw pole motor: harmonic torque estimation using finite element method
    COMPEL (IF 0.59) Pub Date : 2020-07-10
    Dominique Giraud; Baptiste Ristagno; Denis Netter; Julien Fontchastagner; Nicolas Labbe; Vincent Lanfranchi

    Purpose This paper aims to propose a method to evaluate the information obtained on harmonics calculations and to estimate the precision of results using finite element method for an innovative motor topology in which some well-known meshing rules are difficult to apply. Design/methodology/approach The same magnetostatic problem is solved with several mesh sizes using both scalar and vector potentials

  • Simulation of induction thermography NDT technique using SIBC
    COMPEL (IF 0.59) Pub Date : 2020-07-03
    Abdoulaye Ba; Huu Kien Bui; Gérard Berthiau; Didier Trichet; Guillaume Wasselynck

    Purpose This paper aims to present a lightened 3D finite element model (FEM) for coupled electromagnetic thermal simulation of the induction thermography non-destructive testing (NDT) technique to reduce the computation time. Design/methodology/approach The time harmonic electromagnetic problem is expressed in A – ϕ formulation and lightened by using the surface impedance boundary condition (SIBC)

  • Wideband performance limitations of the C-FDTD in the discretization impoverishment of a curved surface
    COMPEL (IF 0.59) Pub Date : 2020-06-30
    Lucas Lobo Latorre Fortes; Sandro Trindade Mordente Gonçalves

    Purpose This paper aims to explore the limitations of the conformal finite difference time-domain method (C-FDTD or Dey–Mittra) when modeling perfect electric conducting (PEC) and lossless dielectric curved surfaces in coarse meshes. The C-FDTD is a widely known approach to reduce error of curved surfaces in the FDTD method. However, its performance limitations are not broadly described in the literature

  • Improved 3D electromagnetic analytical model for planar induction heater with consideration of transverse edge effects
    COMPEL (IF 0.59) Pub Date : 2020-06-08
    Mohammed Messadi; Larbi Hadjout; Youcef Ouazir; Hakim Bensaidane; Noureddine Takorabet; Thierry Lubin; Smail Mezani

    Purpose This paper aims to propose a new 3D electromagnetic model to compute translational motion eddy current in the conducting plate of a novel linear permanent magnet (PM) induction heater. The movement of the plate in a DC magnetic field created by a PM inductor generates induced currents that are at the origin of a heating power by Joule effect. These topologies have strong magnetic end effects

  • Modeling of airgap flux density for the study of stator core vibration in low speed synchronous machines
    COMPEL (IF 0.59) Pub Date : 2020-06-05
    Allan De Barros; Ivan Chabu

    Purpose This paper aims to develop models and simulations focused on the prediction of electromagnetic forces acting on the stator core of a synchronous machine. It contributes to the study of stator core vibrations. Design/methodology/approach An analytical model based on the rotating fields’ theory including the damper winding contribution was developed. Such model allows the comprehension of airgap

  • New digital background calibration method for pipelined ADCs
    COMPEL (IF 0.59) Pub Date : 2020-06-04
    Ehsan Zia; Ebrahim Farshidi; Abdolnabi Kosarian

    Purpose Pipelined analog-to-digital converters (ADCs) are widely used in electronic circuits. The purpose of this paper is to propose a new digital background calibration method to correct the capacitor mismatch, finite direct current (DC) gain and nonlinearity of residue amplifiers in pipelined ADCs. Design/methodology/approach The errors are corrected by defining new functions based on generalized

  • Transient quasi-3D magneto-thermal analytical solution in PM induction heating device
    COMPEL (IF 0.59) Pub Date : 2020-05-23
    Ammar Abdi; Youcef Ouazir; Georges Barakat; Yacine Amara

    Purpose This paper aims to develop a new quasi-three dimensional (3D) analytical model devoted to the study of nonlinear transient magneto-thermal coupled problems in permanent magnet (PM) transverse flux induction heating device (TFIHD). Design/methodology/approach The presented work is based on analytical development of strongly coupled problem, including electromagnetic and thermal boundary problems

  • Unstructured PEEC method with the use of surface impedance boundary condition
    COMPEL (IF 0.59) Pub Date : 2020-05-20
    Gerard Meunier; Quang-Anh Phan; Olivier Chadebec; Jean-Michel Guichon; Bertrand Bannwarth; Riccardo Torchio

    Purpose This paper aims to study unstructured-partial element equivalent circuit (PEEC) method for modelling electromagnetic regions with surface impedance condition (SIBC) is proposed. Two coupled circuits representations are used for solving both electric and/or magnetic effects in thin regions discretized by a finite element surface mesh. The formulation is applied in the context of low frequency

  • Dynamic output feedback control for nonlinear large-scale interconnected systems
    COMPEL (IF 0.59) Pub Date : 2020-05-18
    Ezzeddine Touti; Ali Sghaier Tlili; Muhannad Almutiry

    Purpose This paper aims to focus on the design of a decentralized observation and control method for a class of large-scale systems characterized by nonlinear interconnected functions that are assumed to be uncertain but quadratically bounded. Design/methodology/approach Sufficient conditions, under which the designed control scheme can achieve the asymptotic stabilization of the augmented system,

  • A bicomplex finite element method for wave propagation in homogeneous media
    COMPEL (IF 0.59) Pub Date : 2020-05-13
    Thomas Reum; Hannes Toepfer

    Purpose The purpose of this paper is to present the advantageous applicability of the bicomplex analysis in the context of the Finite Element Method (FEM). This method can be applied for wave propagation problems in various environments. Design/methodology/approach In this paper, the bicomplex number system is introduced and accordingly the differential equation for time-harmonic Maxwell’s equations

  • Spurious radiation suppression in microstrip monopulse antenna
    COMPEL (IF 0.59) Pub Date : 2020-05-11
    Rasime Uyguroğlu; Allaeldien Mohamed Hnesh; Muhammad Sohail; Abdullah Y. Oztoprak

    Purpose This paper aims to introduce a new novel microstrip monopulse comparator system to reduce the spurious radiation from the comparator and the feed network for achieving better radiation performance. Design/methodology/approach Two substrate layers have been used for the microstrip monopulse comparator system. The feed network and the comparator circuits are on the first substrate layer and the

  • A fault tolerant sensorless position estimation scheme for switched reluctance motor at low speed
    COMPEL (IF 0.59) Pub Date : 2020-05-11
    Feng Dong; Hao Chen; Shuai Xu; Sihang Cui

    Purpose This paper aims to present a novel position sensorless control scheme with fault-tolerance ability for switched reluctance motor at low speed. Design/methodology/approach First, the detection pulses are injected in the freewheeling and idle intervals of each phase. Second, the aligned position of each phase can be detected by comparing the consecutive rise time of detection current. Third,

  • Model order reduction techniques applied to magnetodynamic T-Ω-formulation
    COMPEL (IF 0.59) Pub Date : 2020-05-11
    Fabian Müller; Lucas Crampen; Thomas Henneron; Stephane Clénet; Kay Hameyer

    Purpose The purpose of this paper is to use different model order reduction techniques to cope with the computational effort of solving large systems of equations. By appropriate decomposition of the electromagnetic field problem, the number of degrees of freedom (DOF) can be efficiently reduced. In this contribution, the Proper Generalized Decomposition (PGD) and the Proper Orthogonal Decomposition

  • Parametric dependence of lightning impulse behavior of grounding electrodes buried in a dispersive and ionized lossy soil under first- and subsequent-stroke currents
    COMPEL (IF 0.59) Pub Date : 2020-05-09
    Seyed Sajad Sajadi; Saeed Reza Ostadzadeh; Seyed Hossein Hesamedin Sadeghi

    Purpose The purpose of this paper is to investigate the simultaneous effects of ionization and dispersion of soil on the impulse behavior of grounding electrodes under first and subsequent stroke currents. Design/methodology/approach A recently introduced technique called improved multi-conductor transmission line (MTL) is simplified for grounding electrodes buried in both-affected soils. Findings

  • Investigation on the shaft voltage generation of large synchronous turboalternators
    COMPEL (IF 0.59) Pub Date : 2020-05-08
    Kevin Darques; Abdelmounaïm Tounzi; Yvonnick Le-menach; Karim Beddek

    Purpose This paper aims to go deeper on the analysis of the shaft voltage of large turbogenerators. The main interest of this study is the investigation process developed. Design/methodology/approach The analysis of the shaft voltage because of several defects is based on a two-dimensional (2D) finite element modeling. This 2D finite element model is used to determine the shaft voltage because of eccentricities

  • Modeling the electric field at interfaces and surfaces in high-voltage cable systems
    COMPEL (IF 0.59) Pub Date : 2020-05-08
    Christoph Jörgens; Markus Clemens

    Purpose In high-voltage direct current (HVDC) cable systems, space charges accumulate because of the constant applied voltage and the nonlinear electric conductivity of the insulating material. The change in the charge distribution results in a slowly time-varying electric field. Space charges accumulate within the insulation bulk and at interfaces. With an operation time of several years of HVDC systems

  • Design techniques for cogging torque reduction in a fractional-slot PMBLDC motor
    COMPEL (IF 0.59) Pub Date : 2020-05-06
    Lidija Petkovska; Paul Lefley; Goga Vladimir Cvetkovski

    Purpose This paper presents the design techniques applied to a novel fractional-slot 6/4 pole permanent magnet brushless direct current (PMBLDC) motor, for cogging torque reduction. The notable feature of this motor is the simplicity of the design and low production cost. The purpose of this paper is to reduce the peak cogging torque of the motor. The focus is put on the stator topology tuning, and

  • Multi-physics analysis of a novel circular pantograph catenary system for high-speed trains
    COMPEL (IF 0.59) Pub Date : 2020-05-04
    Song Xiao; Yuanpei Luo; Jingchi Wu; Can Zhang; Yang Rao; Guangning Wu; Jan Sykulski

    Purpose In high-speed trains, the energy is supplied from a high voltage catenary to the vehicle via a pantograph catenary system (PCS). Carbon pantograph strips must maintain continuous contact with the wire to ensure safety and reliability. The contact is often confined to a particular spot, resulting in excessive wear due to mechanical and thermal damage, exacerbated by the presence of an electric

  • Guest editorial
    COMPEL (IF 0.59) Pub Date : 2020-05-04
    Valeri Mladenov; Wolfgang Mathis

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ACS ES&T Engineering
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