Eddy Current Analysis Considering Lamination for Stator Core Ends of Turbine Generators

Yamazaki, Katsumi; Tada, Shin; Mogi, H.; Mishima, Yoshitsugu; Kaido, Chikara; Kanao, Shinichi; Takahashi, Kazuhiro; Ide, Kazumasa; Hattori, Kenichi; Nakahara, Akihito

doi:10.1109/tmag.2007.916246

Cited by 64 publications

(20 citation statements)

References 5 publications

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“…Until now, finite-element simulations used to compute the magnetic field are mainly based on two-dimensional models [2] or simplified 3D models. These models do not allow the computation of eddy currents or they are based on simplified geometry [3][4][5]. Moreover, experimental analyses are not easy to implement because they require an experimental bench that represents a real stator or at least a piece of a real stator, what is rather unusual.…”

Section: Introductionmentioning

confidence: 99%

Experimental Model for Study of Electromagnetic Phenomena in Stator Core-End Laminations of Large Generators

Vogt¹,

Demian²,

Romary³

et al. 2013

PIER B

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Abstract-This paper describes an experimental model for the characterization of electromagnetic phenomena that occur within the end regions of large turbo-generators. The study is based on a test bench that contains a stack of steel laminations from a 900 MW turbo-generator stator and two exciting circuits in order to combine a transverse magnetic flux with the in-plane flux. In order to explain the flux penetration within the magnetic sheet stack, accurate experimental measurements are performed. Results are compared with finite-element simulations using code Carmel3D. In the same time, theoretical and experimental results are analyzed with a view to examining the influence of transverse flux on additional losses.

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Section: Introductionmentioning

confidence: 99%

Experimental Model for Study of Electromagnetic Phenomena in Stator Core-End Laminations of Large Generators

Vogt¹,

Demian²,

Romary³

et al. 2013

PIER B

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show abstract

“…Many papers have presented eddy current analysis for laminated cores [1][2][3][4][5]. Most of these analysis models are related to large size electric machines such as turbine generators and transformers [1][2][3], or those for high harmonic applications such as reactors [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Most of these analysis models are related to large size electric machines such as turbine generators and transformers [1][2][3], or those for high harmonic applications such as reactors [4,5]. In those applications, the eddy current loss by the flux, which is perpendicular to the laminated cores, is only a few percentages of the total iron losses.…”

Section: Introductionmentioning

confidence: 99%

“…However, the effect cannot be overlooked because of heat problems. Due to this, segmented stator cores with lapping between adjacent layers [1] or slits on the stator teeth and the reactor cores to reduce eddy current losses on each steel sheet [1,2], [4][5][6] have been adopted.…”

Section: Introductionmentioning

confidence: 99%

“…Its fundamental magnetic frequency is 150 Hz at the rated speed, the output power is under 1 kW, the outer diameter is 206 mm and the axial length is 112 mm. If a general longitudinal flux rotary machine (LFRM), similar to the machines in [1][2][3], had these characteristics the eddy current loss would not be quite as severe a problem because of the laminated cores. The TFRM in this paper also has laminated stator cores, these consist of inner and outer cores whose laminated directions are perpendicular to each other considering magnetic flux path.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stator Core with Slits in Transverse Flux Rotary Machine to Reduce Eddy Current Loss

Lee¹,

Koo²,

Kang³

et al. 2012

Journal of Magnetics

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This paper presents an eddy current loss analysis for a transverse flux rotary machine (TFRM) with laminated stator cores, which consist of inner and outer cores whose laminated directions are perpendicular to each other. Although the TFRM is laminated to reduce eddy current losses, it still exhibits rapidly increasing core losses as the frequency increases. To solve this problem, slits are introduced to the stator outer core. 3-dimensional finite element analysis (3D FEA) based on the T-Ω formulation is used to solve the eddy-current problem for a various numbers of slits in the nonlinear lamination core. The effects of the slits are confirmed using experiment data and 3D FEA results.

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Basic study of loss reduction effect by Stator‐Tooth slits in turbine generators. comparison between calculated results of generators and basic experiments

Yamazaki

Nishioka

Nakahara

et al. 2013

Electrical Engineering Japan

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In this study, we investigate the loss reduction effect by stator‐teeth slits in turbine generators on the basis of electromagnetic field analysis and basic experiments. First, the loss reduction effect in the generator is estimated by the 3D finite element method and the theoretical solution of eddy current loss. Next, an experiment using a simple model that simulates the stator‐core ends of the turbine generator is carried out. It is clarified that the loss reduction effect by the slits depends on the frequency, flux density, and permeability of the stator teeth because the loss reduction effect weakens with the skin effect. © 2013 Wiley Periodicals, Inc. Electr Eng Jpn, 183(3): 17–25, 2013; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.22345

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Eddy Current Analysis Considering Lamination for Stator Core Ends of Turbine Generators

Cited by 64 publications

References 5 publications

Experimental Model for Study of Electromagnetic Phenomena in Stator Core-End Laminations of Large Generators

Experimental Model for Study of Electromagnetic Phenomena in Stator Core-End Laminations of Large Generators

Stator Core with Slits in Transverse Flux Rotary Machine to Reduce Eddy Current Loss

Basic study of loss reduction effect by Stator‐Tooth slits in turbine generators. comparison between calculated results of generators and basic experiments

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