End-Winding Vibrations Caused by Steady-State Magnetic Forces in an Induction Machine

Lin, Ranran; Laiho, Antti; Haavisto, Ari; Arkkio, Antero

doi:10.1109/tmag.2010.2044043

Cited by 44 publications

(13 citation statements)

References 32 publications

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“…Under the time-harmonic analysis, the magnetic force density in the coil ends was [6] , ,~c os(2 ) , , 0 , , ,~c os (2 ) , , 0 , , ,~c os(2 ) , , 0…”

Section: A Analysis Of Electromagnetic Modelmentioning

confidence: 99%

“…As the power of the induction motors are usually several MW-level, while in large synchronous generators they own several hundred MVA-level capacities, then the support structures between them are usually different. Recently, some studies are also concerned about the vibrations in large induction motors [6]. Multi-phase asynchronous machine is one kind of a particular induction machine.…”

Section: Introductionmentioning

confidence: 99%

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Magneto-Structural Coupling Field Analysis on the End Winding of an Multi-Phase Induction Machine

Huang

Ruan

Zhang

et al. 2012

2012 Sixth International Conference on Electromagnetic Field Problems and Applications

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In order to study the steady-state electromagnetic forces acting on the stator end-winding in a multi-phase induction machine during the operation, we conducted a 3-D electromagnetic analysis coupled with a 3-D mechanical analysis to analyze the stress and the deformation. Both of the analyses are done by the finite-element method. Meanwhile, the geometry of the nose portion is modified for the limited computer resources. The result shows the nose part of the coil ends experiences larger displacement, but von Mises stresses are larger in the straight part. Keywords-end winding; electromagnetic force; finite element method; sequential coupling; stress fieldI.

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“…Under the time-harmonic analysis, the magnetic force density in the coil ends was [6] , ,~c os(2 ) , , 0 , , ,~c os (2 ) , , 0 , , ,~c os(2 ) , , 0…”

Section: A Analysis Of Electromagnetic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magneto-Structural Coupling Field Analysis on the End Winding of an Multi-Phase Induction Machine

Huang

Ruan

Zhang

et al. 2012

2012 Sixth International Conference on Electromagnetic Field Problems and Applications

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“…Having in mind the fact that the amount of electrical generators in the world is around 16 billion, extensive research in new and modern techniques in condition monitoring and fault diagnostics for the electrical machines are very beneficial [3,4]. The most complex part of a generator to design, but also to fabricate and sustain is the end-winding region of the stator which is very submissive to failure due to vibrations [5][6][7]. The end-winding provides safe electrical connections between bars and prevents insulation failure between the connection points.…”

Section: Introductionmentioning

confidence: 99%

Impact testing of hydro generators end-winding in different temperature state

Anachkova¹,

Jovanova²,

Petreski³

2020

J. vibroeng.

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The fault detection of rotating electrical machines has become very attractive field of research from vibrational aspect, because these machines are susceptible to failure due to thermal, electrical, mechanical or environmental stresses. Therefore, the vibrational analysis of generators as rotating machines will be beneficial for the generator design in the initial stage and also for online monitoring and faults diagnostics during generator operation. This paper presents a novel methodology for hammer impact testing ("bump-test") of stators end-winding vibrations with an accent on the influence of the physical parameters such as temperature. Introductory, a brief survey of recent research in the area is presented. Furthermore, a detailed description of the used instrumentation and conducted testing methodology according to established standards is systematically exposed. The measurement methodology is implemented on two generators, a cold one in its' repairing phase and second identical, generator in a warm condition in order to detect the damaged elements and to investigate the influence of the temperature on the dynamic characteristics (natural frequencies and rigidity) of the structures. A year later, series of same measurements on one of the generators during a process of its' cooling were conducted. This work provides graphical, as well as numerical results for the dynamical behaviour of the structures under different thermal conditions. Ultimately, a conclusion for the dependence between the temperature and the dynamics parameters of the generator is drawn.

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“…However, the winding, due to its elastic properties and mass, directly impacts the mechanical response of the structure. In order to consider the winding influence, especially for solving the mechanical problem, two main methods have been used to date: 1) consider a fine mesh of the heterogeneous winding domain [5] and 2) consider an additional mass of the winding domain [6]. The first method is suitable in the study of high-power machines whose windings are made by copper bars, and in the end-winding modeling.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Approach Including the Winding Impact for Electrical Machine Vibration Analysis

Huang

Galopin

Chadebec

et al. 2019

2019 22nd International Conference on the Computation of Electromagnetic Fields (COMPUMAG)

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A numerical approach is presented to study and analyze the winding influence on the vibration problem of electrical machines. A multiscale homogenization method is developed to model the mechanical response of the winding structure, which is hard to be finely modeled. Associated with a magneto-mechanical formulation, this approach allows analyzing the mechanical deformation and vibration problem of electrical devices. The computational method has been applied to the magneto-mechanical analysis of a switched reluctance machine. The results show the importance of considering the windings in the vibration analysis of electrical machines.

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End-Winding Vibrations Caused by Steady-State Magnetic Forces in an Induction Machine

Cited by 44 publications

References 32 publications

Magneto-Structural Coupling Field Analysis on the End Winding of an Multi-Phase Induction Machine

Magneto-Structural Coupling Field Analysis on the End Winding of an Multi-Phase Induction Machine

Impact testing of hydro generators end-winding in different temperature state

A Numerical Approach Including the Winding Impact for Electrical Machine Vibration Analysis

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