Electromagnetic Forces on the Armature End Windings of Large Turbine Generators I??? Steady State Conditions

Scott, Maggie; Salon,; Kusik,

doi:10.1109/mper.1981.5511923

Cited by 3 publications

(7 citation statements)

References 1 publication

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“…As shown in Scott et al (1981), a recursive algorithm has been successfully introduced to handle with integral formulations. The method has been extended to the E matrix.…”

Section: Analysis Of End Windingsmentioning

confidence: 99%

“…In this paper, an approach to the underlying non-linear magnetostatic problem based on a 3D integral formulation (Rubinacci et al, 2005;Rubinacci et al, 2009;Scott et al, 1981) is presented. The advantages of this formulation compared to the differential ones are well known and concern mainly: COMPEL 30,6 .…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, an approach to the underlying non‐linear magnetostatic problem based on a 3D integral formulation (Rubinacci et al , 2005; Rubinacci et al , 2009; Scott et al , 1981) is presented. The advantages of this formulation compared to the differential ones are well known and concern mainly:the reduction of the number of unknown because just the parts of the domain where magnetization is located have to be discretized; andthe automatic fulfillment of the normal boundary conditions.The fully 3D non‐linear analysis of the end winding region of an electric machine takes advantage of the aforementioned features mainly because the computational resources are “focused” only in the region of interest, i.e.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electromechanical analysis of end windings in turbo generators

Albanese

Calvano

DalMut

et al. 2011

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

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Purpose - The purpose of this paper is to present a numerical approach for the computation of 3D magnetic fields in rotating electrical machines. The technique is suitable for the computation of flux densities and forces in the end windings of large synchronous turbo generators (TG). Design/methodology/approach - The magnetostatic FEM model of the generator end windings is carried out for different displacements of the rotor axis to the stator magmetomotive force (MMF) axis. The method is based on a parallel integral formulation allowing to substantially reduce the computational effort. Findings - The computational model requires only the discretization of magnetic materials and conductors and is fast enough for carrying out 3D analyses on a time scale fast enough for the needs of the designer. As far as the present application is concerned, the analysis of a synchronous generator in the class of 300-400 MVA has shown that the most stressed elements of the armature conductors are those closer to the stator ends. The study demonstrates that the maximum stress component on the end windings is axial and is achieved when the MMF is aligned to the direct axis. Originality/value - The present approach combining an efficient integral formulation, the sparsification of the relevant matrices and the parallel implementation of the related algorithms gives rise to an original computational tool that allows a more accurate description of the machine in comparison to other numerical simulations that can be found in the literature

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“…As shown in Scott et al (1981), a recursive algorithm has been successfully introduced to handle with integral formulations. The method has been extended to the E matrix.…”

Section: Analysis Of End Windingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electromechanical analysis of end windings in turbo generators

Albanese

Calvano

DalMut

et al. 2011

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

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show abstract

“…Bucci et al in 1971 [5]. Hereafter, the finite element analysis (FEA) method and the corresponding case study of the electromagnetic force on the stator end windings under steady state [6] and transient conditions [7] in large turbine generators were presented, respectively. In addition, the integral equation method for calculating the electromagnetic forces under symmetric, asymmetric, sudden short-circuit, and various power factor conditions [8], was proposed as well.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Analysis on Transient Electromagnetic Force Behavior of Stator Windings in Turbo-Generator

Jiang

Tang

et al. 2018

Mathematical Problems in Engineering

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This paper presents a comprehensive analysis on the transient electromagnetic force behavior of the stator windings in a QFSN-600-2YHG type turbo-generator. Different from other studies, this paper investigates not only the distribution regularities of the resultant force and the force density, but also the force harmonic characteristics, and the mechanical responses which will cause sensitive impact on the insulation wearing. The whole work is generally based on a proposed simplified model and the 3D finite element coupling calculation. The simplified model contains two parts. The first part is the theoretical model that employs the approximate solution of the image current to obtain the analytic formula of the electromagnetic force on the end windings conveniently. The second part is the FEA model that employs only the end windings and one-tenth of the stator core to save the calculating memory and, meanwhile, obtain the qualified electromagnetic force as well as the mechanical response. It is shown that the nose-top, the connection point between the line part and the end part, and the middle of the involute are the three most dangerous positions of the end winding to sustain serious insulation wearing. Moreover, the winding, which endures the maximum mechanical response, is neither always consistent with the one that has the largest resultant electromagnetic force nor directly in accordance with the winding that affords the most intensive electromagnetic force density. The findings in this paper will be beneficial for the insulation monitoring and the manufacturing improvement on the stator windings.

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“…On the contrary, the end winding contribution can only be computed from the actual 3D magnetic field distribution. Most analytical approaches to the magnetic field computation (Tegopoulos, 1964(Tegopoulos, , 1963, including the most recent ones (Lazarns et al, 2009), are based on the solution of the Biot-Savart law through equivalent current sheet representations, using axisymmetric hypothesis (Scott et al, 1981) or the theory of images (Li and Wang, 1989).…”

Section: Introductionmentioning

confidence: 99%

Computation of end-winding inductances of rotating electrical machinery through three-dimensional magnetostatic integral FEM formulation

Calvano¹,

Mut

Ferraioli

et al. 2013

COMPEL

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Purpose - The paper aims to illustrate a numerical technique to calculate fields and inductances of rotating electrical machines. Design/methodology/ approach - The technique is based on an integral formulation of the nonlinear magnetostatic model in terms of the unknown magnetization. The solution is obtained by means of a Picard-Banach iteration whose convergence can be theoretically proved. Findings - The proposed method has been used to build a model of a large turbine generator. In particular, the influence of end effects on flux linkages has been computed. It has been demonstrated that the 2D solution underestimates the flux linkages as well as the no load voltage of 2 per cent, while the leakage fluxes are computed by the 2D solution with errors as high as 20 per cent. Originality/value - The method is advantageous in comparison to standard methods

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Electromagnetic Forces on the Armature End Windings of Large Turbine Generators I??? Steady State Conditions

Cited by 3 publications

References 1 publication

Electromechanical analysis of end windings in turbo generators

Electromechanical analysis of end windings in turbo generators

A Comprehensive Analysis on Transient Electromagnetic Force Behavior of Stator Windings in Turbo-Generator

Computation of end-winding inductances of rotating electrical machinery through three-dimensional magnetostatic integral FEM formulation

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