Dynamic behaviour investigation of electromagnetic force densities

Stancheva, Rumena; Iatcheva, Ilona

doi:10.1016/j.jmatprotec.2004.07.033

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…It is found that the quasi-three-dimensional (quasi-3D) finite-element method is able to take advantages over the conventional 3D FEA in memory size and time efficiency [9]. Significantly, besides the rated load condition, numerical 2 Mathematical Problems in Engineering simulations on the electromagnetic force densities in the three-phase short circuit condition [10] and the leading power factor case [11] were carried out, respectively. However, these studies mainly paid attention to the electromagnetic force itself, while the consequent responses such as the mechanical vibration deformations and strains, which will cause dynamic wearing to the winding insulation, have been rarely investigated in depth.…”

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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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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“…The length of an air-gap is a design compromise between mechanical and electrical parameters, and it should not be too short, otherwise the UMP may be of very large magnitude. Although several papers [15][16][17][18][19], for instance, have studied the UMP in electrical machines from the electrical point of view, fewer papers in the literature [20][21][22], for example, have attempted to model the UMP for mechanical dynamic analysis. It is worthwhile to note that limitations in numerical computations in the earlier years did restrict rigorous investigations to be made.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of a hydropower generator subjected to unbalanced magnetic pull

Calleecharan

Aidanpää

2011

Proceedings of the Institution of Mechanical Engineers, Part C:

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Eccentricity leading to unbalanced magnetic pull (UMP) in electrical machines is a significant concern in industry. The UMP is known to be composed of two components: a radial component and a tangential one. Models that are used in industry tend to include the radial component alone. In this article, a Jeffcott rotor model together with a new UMP model that incorporates both radial and tangential UMP constituents is studied for an industrial hydropower generator. Characterizing the UMP as springs permits the model to inherit UMP stiffness contribution. Interesting dynamics are observed with the new model for a wide range of external forcing frequencies. It is shown firstly that the new UMP model is sensitive to forcing frequency in the rotor movements. Secondly, it is found that this sensitivity to forcing frequency increases with decreasing rotor system stiffness. Moreover, quasi-periodic motion in the rotor displacements is observed and it is noted that the rotor does not need to be forced by frequencies above its critical speed for this less desirable motion to occur. Thus, it becomes interesting to be able to account for the UMP stiffness contribution in order to curb machine malfunction which might result from these UMP forces.

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Stability analysis of an hydropower generator subjected to unbalanced magnetic pull

Calleecharan

Aidanpää

2011

IET Sci. Meas. Technol.

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Dynamic behaviour investigation of electromagnetic force densities

Cited by 5 publications

References 3 publications

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

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

Dynamics of a hydropower generator subjected to unbalanced magnetic pull

Stability analysis of an hydropower generator subjected to unbalanced magnetic pull

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