Electrical machine analysis considering field – circuit – movement and skewing effects

Oliveira, Aline Mara de; Antunes, Roque Rodrigues; Kuo‐Peng, Patrick; Sadowski, N.; Dular, Patrick

doi:10.1108/03321640410553517

Cited by 24 publications

(22 citation statements)

References 7 publications

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“…The proposed method has been furthermore improved by the use of the multi-sliced procedure (Dziwniel et al, 2000;Oliveira, et al, 2004). Four current-fed 2-D FE models have been coupled together by the electric circuit assuring the uniform rotor current distribution through four 2-D slices.…”

Section: Multi-slice Modelmentioning

confidence: 99%

Numerical analysis of steady-state operation of three-phase induction machines by an approximate frequency domain technique1

Stermecki

Bíró

Preis

et al. 2011

Elektrotech. Inftech.

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An approximate frequency domain technique is applied to determine the initial values for the transient time-stepping numerical scheme required to take time dependent phenomena like induced voltages, eddy currents and slot ripples in induction machines into account. Using the initial conditions obtained, the steady-state operation of the motor is obtained much faster than by assuming zero initial values. This procedure is employed to the current-fed and voltage-fed 2-D induction motor models and, additionally, to the 2-D multislice FEM model of the 1 MW squirrel cage induction motor.Numerische Analyse des station€ aren Betriebszustands einer dreiphasigen Asynchronmaschine mit Hilfe einer Vorabsch€ atzung im Frequenzbereich.Eine Vorabsch€ atzung im Frequenzbereich wird angewandt, um die notwendigen Startwerte f€ ur die transiente Analyse im Zeitschrittverfahren zu ermitteln. Die transiente Analyse erlaubt es, zeitlich ver€ anderliche Vorg€ ange, wie induzierte Spannungen, Wirbelstr€ ome und Oberwellenmomente, zu erfassen. Mit den Startwerten aus der Frequenzbereichs-Analyse kann der station€ are Betriebszustand deutlich schneller erreicht werden als bei der Annahme aller Startwerte mit null. Die Anwendung der Methode wird an einem Strom-und Spannungs-gespeisten 2-D-Asynchronmaschinen-Modell sowie an einem 2-D-Mehr-Schichten-Modell eines K€ afigl€ aufers gezeigt. IntroductionThe efficient analysis of an induction motors steady-state operation under arbitrary load conditions with the effects of the time-varying electrical variables as well as those due to rotor movement considered is a very challenging engineering task. Using time-harmonic finite element (FE) analysis in order to simulate the motors steadystate operation is not sufficient, since motional eddy current effects are not included in the time-harmonic approach. Therefore, the time-harmonic analysis often fails in torque computation e.g. when motor operation at lower speed is under consideration whereby the torque characteristic is affected by the asynchronous crawling tendencies. To include these transient phenomena in the analysis, a transient FE time-stepping numerical procedure is required. When such a procedure is started with zero initial conditions, a huge computational effort is needed to reach the steady-state solution. This approach is often referred to as the brute force method. A previous work using this direct method at the induction motor analysis has been published by the authors in (Stermecki et al., 2006). The brute force method becomes especially unsuitable when larger electromagnetic devices are to be analyzed. To avoid the cumbersome time-stepping through the transient phenomena, it is much more recommendable to start the solution procedure with non-zero initial conditions. These can be provided using the combination of an electric equivalent circuit analysis and an initial linear

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Section: Multi-slice Modelmentioning

confidence: 99%

Numerical analysis of steady-state operation of three-phase induction machines by an approximate frequency domain technique1

Stermecki

Bíró

Preis

et al. 2011

Elektrotech. Inftech.

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“…It should be noticed that such a model is sufficiently accurate to account for the conduction losses as well as the global commutation effects, it is however too approximate to represent the high-frequency operation of semiconducting elements. The motor itself is modelled considering a two-dimensional distribution of the magnetic field over the axially distributed mesh slices to approximate the stator stack skew (2.5-D model) [18,19]. Equations that result from the discrete approximation of the Ampere's law, and those fulfilling the Kirchhoff's laws in the electric circuits can be written in the form:…”

Section: Basic Equationsmentioning

confidence: 99%

Steady-state time-periodic finite element analysis of a brushless DC motor drive considering motion

Jagieła

Gwóźdź

2015

Archives of Electrical Engineering

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This paper aims at providing a framework for comprehensive steady-state time-domain analysis of rotating machines considering motion. The steady-state waveforms of electromagnetic and circuit quantities are computed via iterative solution of the nonlinear field-circuit-and-motion problem with constraints of time periodicity. The cases with forced speed and forced load torque are considered. A comparison of execution times with a conventional time-stepping transient model is carried out for two different machines. The numerical stability of a time-periodic model with forced speed is shown to be worse than that of traditional transient time-stepping one, although the model converges within a reasonable number of iterations. This is not the case if forced load via equation of mechanical balance is accounted for. To ensure convergence of the iterative process the physical equation of motion is replaced by the fixed-point equation.In this way the model delivers time-periodic solutions regarding not only the electromagnetic quantities but also the rotational speed.

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“…The mathematical model of transient electromagnetic phenomena must include (De Oliviera et al, 2003;Mikołajewicz, 2001):…”

Section: Mathematical Modelmentioning

confidence: 99%

Reducing power losses in axisymmetric electromechanical converters

Mikołajewicz

Nowak

2006

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -The aim of the paper is to find the effective methods of power loss reduction in axisymmetric electromagnetic devices and improve their dynamic parameters. As an example the linear tubular motor is considered. Design/methodology/approach -The elaborated algorithm has been applied to analyze the dynamic operation of axisymmetric electromagnetic devices, especially tubular linear induction motors. The mathematical model of transients includes: the equation of electromagnetic field, the equations of electric circuits and the equation of motion. The model is based on the finite element method. For the time-stepping, the Cranck-Nicholson scheme is applied. In order to include non-linearity, the Newton-Raphson process is adopted. Findings -In order to reduce the influence of eddy currents, it is suggested that the solid core should be equipped with one or several radial slots. In such a case, the radial component of eddy currents occurs near the slot and disturbs the axial symmetry of the system. However, when the width of the slot is small, the fields generated by the radial component of eddy currents on both sides of the slot practically cancel one another and the system can still be considered axisymmetric. Another solution given in the paper consists of replacing the cylindrical core with a system of flat laminated segments. In such a case, saturation of the ferromagnetic parts is greater than in the case of classical axisymmetric core. Originality/value -In the paper, new quasi-2D axisymmetrical field-circuit methodology for electromagnetic device dynamics analysis has been elaborated. Proposed constructional solutions enable one to reduce the power losses in the primary core by half and total losses by 30 percent.

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Electrical machine analysis considering field – circuit – movement and skewing effects

Cited by 24 publications

References 7 publications

Numerical analysis of steady-state operation of three-phase induction machines by an approximate frequency domain technique1

Numerical analysis of steady-state operation of three-phase induction machines by an approximate frequency domain technique1

Steady-state time-periodic finite element analysis of a brushless DC motor drive considering motion

Reducing power losses in axisymmetric electromechanical converters

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