Study of Static and Dynamic Eccentricities of a Synchronous Generator Using 3-D FEM

Iamamura, B. A. T.; Menach, Yvonnick Le; Tounzi, A.; Sadowski, N.; Guillot, E.

doi:10.1109/tmag.2010.2043347

Cited by 47 publications

(25 citation statements)

References 6 publications

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“…It can be proved that the eccentricity invigoration occurs because of UMP in faulty machine. For no load machine, the UMP has been studied by [13][14][15] Table I, under the same load torque in healthy condition by FEM via Maxwell.V.16 software (Ansys, Inc., Canonsburg, PA, USA) as shown in Figure 14. The Steel_1008 is considered for both rotor and stator core material in Maxwell environment as the only difference between the FEM and proposed approach.…”

Section: Equations With Discrete Machine Modelingmentioning

confidence: 99%

“…In healthy machine, consequent on radial forces is zero for all given points of the rotor, but further analysis is required in a faulty machine. Radial force consequent on a given arbitrary point of rotor can be computed by (13) and (15) [12], and unbalanced magnetic pull (UMP) is produced in faulty machine as written in (14).…”

Section: Equations With Discrete Machine Modelingmentioning

confidence: 99%

“…The same method has been used in [14], considering WFT, for a permanent magnet synchronous machine in which the magnets have been modeled by virtual coils. A 3D FEM base eccentricity fault diagnosis for synchronous machine has been proposed by Iamamura, et al in [15] wherein fault diagnosis has been confirmed using the torque's signatures. The research performed only a series of simulation results without performing any dynamic model.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Torque/current spectral analysis for healthy and eccentricity faulty synchronous reluctance machine using mathematical modeling method

Naderi

2015

Int. Trans. Electr. Energ. Syst.

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SUMMARYIn this research, considering slot opening and distributed winding effects, torque ripple analysis is studied for four separate synchronous reluctance machines (SynRMs) under health and eccentricity fault conditions using a mathematical method. A finite element method (FEM) validated model is produced by mathematical modeling, and numerical method is used for the machine's behavior studying with voltage source supplying. With this aim, the machine's parameters have been computed under health and eccentricity fault conditions, using modified winding function theory (MWFT). A method of dynamic and static eccentricity fault diagnosis is proposed, which uses machine vibration analysis, and the results suggest that the eccentricity fault does not have any significant effect on the machine's currents. Moreover, unbalance magnetic pull (UMP) is computed under eccentricity fault conditions and mechanical un-stability is shown. Mathematical base model and voltage source machine supply and also presenting a discrete machine modeling method are the main advantages of this paper compared with other similar works that are usually FEM-based studies or have been based on current source power supply. The research is applicable to healthy and faulty machine behavior, and the methodical modeling is obviously applicable to other machines.

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Section: Equations With Discrete Machine Modelingmentioning

confidence: 99%

Section: Equations With Discrete Machine Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Torque/current spectral analysis for healthy and eccentricity faulty synchronous reluctance machine using mathematical modeling method

Naderi

2015

Int. Trans. Electr. Energ. Syst.

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“…Dynamic eccentricity aspects were studied in [8] in a four pole synchronous generator in order to analyze its impact on flux line distribution and profile inductance. A method to detect static and dynamic eccentricities was studied in [9]. This consists of adding two 90º shifted magnetic flux density signals measured in the air gap.…”

mentioning

confidence: 99%

“…Equations (5), (6) and (8), (9) were used in the Finite Element software to compute the radial and tangential electromagnetic forces, in case of a perfect machine without eccentricities and also in case of a machine with static and dynamic eccentricities. Or Or e field can be expressed in terms of the magnetic vector potential A and current density J s in the armature and field windings in the generator as follows [7], [9]. In case of magnetostatic formulation:…”

mentioning

confidence: 99%

Study of the impact of eccentricity in large synchronous generator with finite elements

Dirani

Merkhouf

Giroux

et al. 2014

2014 International Conference on Electrical Machines (ICEM)

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Φ Abstract --This paper presents a numerical model for computing electromagnetic forces in an existing large hydro generator at Hydro-Québec. Due to the high mass and low rotational speed, hydro generators present static, dynamic or combined eccentricities resulting in unbalanced magnetic pull in the air gap and unbalanced stator currents caused by the variation of the magnetic flux density distribution. The model uses advanced 2-D numerical finite-element analysis to compute the electromagnetic forces based on Maxwell stress tensor and the obtained results were used later as inputs to study the dynamic behavior of hydro power turbine shaft. The results obtained for electromagnetic forces, damper bar currents and circuit currents due to any magnetic unbalance are presented and discussed in detail.

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An evaluation of inductances of a salient pole synchronous machine under different axial eccentricity conditions

Akbari

Milimonfared

Meshgin-Kelk

2012

Int. Trans. Electr. Energ. Syst.

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SUMMARY Different radial eccentricities in salient pole machine are well documented in previous studies. In reality, the most probable case is the rotor eccentricity, which is not uniform down the axial length. This article determines a precise model of salient pole synchronous machine for general axial eccentricity condition. Proposed model allows calculating salient pole machine inductances with different static, dynamic, and mixed axial eccentricities in a unified technique. By taking into account machine geometry, slots effects, and type of winding connection, this model is able to consider most of the important features of a salient pole machine. A variant of modified winding unction approach has been used to calculate the inductances under axial eccentricity conditions. The effects of several rotor asymmetries on the inductances are shown, and the inductances are evaluated. The evaluated inductances are compared with those obtained from experiments. There is a good agreement between the simulated and the experimental inductances profiles. Copyright © 2012 John Wiley & Sons, Ltd.

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Study of Static and Dynamic Eccentricities of a Synchronous Generator Using 3-D FEM

Cited by 47 publications

References 6 publications

Torque/current spectral analysis for healthy and eccentricity faulty synchronous reluctance machine using mathematical modeling method

Torque/current spectral analysis for healthy and eccentricity faulty synchronous reluctance machine using mathematical modeling method

Study of the impact of eccentricity in large synchronous generator with finite elements

An evaluation of inductances of a salient pole synchronous machine under different axial eccentricity conditions

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