Electromagnetic Forces on the End Windings of Large Turbine Generators. II. Transient Conditions

Salon,; Scott, Maggie; Kusic,

doi:10.1109/mper.1983.5519564

Cited by 2 publications

(1 citation statement)

References 1 publication

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“…For instance, Kim et al analyzed the distribution of the electromagnetic force on the end windings based on the Biot-Savart law and 3D FEM [7], while Fang et al carry out the calculation of the stress distribution on end windings in a large water filling submersible motor during both steady state and transient operations [8,9]. Also, Salon et al presented the winding force variation under the transient operation in larger turbine generators [10]. Besides the running conditions (steady state and transient case), it is also found that some other factors such as the speed, the power factor, the saturation of the stator teeth, the magnetic field distribution, the winding connection, and the shape of the salient poles will also affect the force magnitude [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Static Rotor Eccentricity on End Winding Forces and Vibration Wearing

Jiang

Tang

et al. 2021

International Journal of Rotating Machinery

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In order to study the vibration wearing regularity and the strength failure point of stator end windings before and after static rotor eccentricity, the three-dimensional electromagnetic forces and the subsequent mechanical responses are studied in this paper. The electromagnetic force, stress, and deformation on the end winding of the QFSN-600-2YHG turbo-generator are calculated by the finite element method (FEM) through an electromagnetic-structure coupling. The radial vibration characteristics of the winding are verified by experiments. It shows that the vibration wearing in the same layer is more serious than that between two neighboring layers. For different layers, the interphase coils endure a larger wearing risk than the innerphase coils. Inside the same phase, the last coil along the rotating direction has the highest risk of insulation wearing. The occurrence of static rotor eccentricity will significantly increase the electromagnetic forces and the vibration amplitudes on some coils. The end-phase coil which is close to the minimum air-gap point is the most dangerous one due to the lasting overstresses and the intensified deformations.

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Section: Introductionmentioning

confidence: 99%

Effect of Static Rotor Eccentricity on End Winding Forces and Vibration Wearing

Jiang

Tang

et al. 2021

International Journal of Rotating Machinery

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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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Electromagnetic Forces on the End Windings of Large Turbine Generators. II. Transient Conditions

Cited by 2 publications

References 1 publication

Effect of Static Rotor Eccentricity on End Winding Forces and Vibration Wearing

Effect of Static Rotor Eccentricity on End Winding Forces and Vibration Wearing

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

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