Forces in machine end windings

Harrington, Dean

doi:10.1109/ee.1953.6438497

Cited by 5 publications

(2 citation statements)

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“…Methods based on the Biot-Savart law are the most popular among them [4][5][6]. However, the errors in the results obtained through analytical methods are large because the end region's structure is complex.…”

Section: Introductionmentioning

confidence: 99%

Influence of End Structure on Electromagnetic Forces on End Winding of a 1550 MW Nuclear Generator

Zhang

Huang

Yang

et al. 2017

International Journal of Rotating Machinery

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A 3D electromagnetic model of the end region of a 1550 MW nuclear generator is set up. The electromagnetic forces on the involute and nose parts of the end winding under a rated operation are obtained through the 3D time-step finite element method. The electromagnetic forces on different coils in the same phase are analyzed. By changing the rotor's relative length and stator coil's linear length in the 3D electromagnetic model, the electromagnetic force distributions on the end winding are obtained. The influence of each structure change on the electromagnetic force in different directions is studied in detail. Conclusions that can be helpful in decreasing the electromagnetic forces on the end winding through optimizing the end region design are presented.

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Section: Introductionmentioning

confidence: 99%

Influence of End Structure on Electromagnetic Forces on End Winding of a 1550 MW Nuclear Generator

Zhang

Huang

Yang

et al. 2017

International Journal of Rotating Machinery

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“…To date, several approaches for calculating the distribution of the end winding force have been proposed [1]- [5]. There is a difference between the calculated force and the real force.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Biot-Savart's Law and 3D FEM in the Study of Electromagnetic Forces Acting on End Winding

Kim¹

2011

Journal of Electrical Engineering and Technology

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-An induction motor operated with high voltage source generally generates high current in starting mode and has a long transient time after being started. This large and sustaining starting current causes the end windings of the stator to have excessive electromagnetic force. This force is the source of vibration and has a negative and serious influence on the insulation of end windings. Therefore, designing the end winding part with an appropriate support system is needed. To design the support ring enclosing the end windings, we analyze the distribution of electromagnetic force on the end windings by applying the Biot-Savart's law and the 3D finite element method (FEM), and comparing two simulation methods. Finally, we verify the safety of the support structure of the end winding part using stress analysis, which is analyzed with the electromagnetic forces from the 3D FEM simulation.

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Comprehensive Investigation of Winding Mechanical Properties in Generators under RISC: Impact of Position, Degree, and Eccentricity

Xu,

He,

Zhang

et al. 2024

IEEJ Transactions Elec Engng

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This paper provides an in‐depth study of the winding mechanical properties in generators under rotor interturn short circuit (RISC) cases. Unlike previous studies, this research investigates not only the influence of RISC degrees, but also the RISC positions and the eccentricity on the winding mechanical properties. The electromagnetic force (EF) formulas as well as the electromagnetic‐structure coupling model are first proposed to derive the mechanical winding response characteristics, such as the vibration, deformation, the strain, and the stress. Subsequently, both finite element analysis (FEA) and experimental investigations are conducted to validate the theoretical findings. The results reveal that RISC introduces additional harmonics to the EF. Furthermore, as the eccentricity/RISC degree or the distance between the short circuit position and the N‐pole increases, the end winding vibrations become more pronounced. When comparing single eccentricity and RISC faults to cases where both faults occur simultaneously, it is observed that the combined faults have a more detrimental impact on the end winding mechanical properties. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.

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Forces in machine end windings

Cited by 5 publications

References 0 publications

Influence of End Structure on Electromagnetic Forces on End Winding of a 1550 MW Nuclear Generator

Influence of End Structure on Electromagnetic Forces on End Winding of a 1550 MW Nuclear Generator

Comparison of Biot-Savart's Law and 3D FEM in the Study of Electromagnetic Forces Acting on End Winding

Comprehensive Investigation of Winding Mechanical Properties in Generators under RISC: Impact of Position, Degree, and Eccentricity

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