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DOI: https://doi.org/10.15407/techned2016.01.034

THREE DIMENSIONAL MATHEMATICAL MODEL OF ELECTROMAGNETIC PROCESSES IN THE END ZONE OF THE TURBOGENERATOR ROTOR

Journal Tekhnichna elektrodynamika
Publisher Institute of Electrodynamics National Academy of Science of Ukraine
ISSN 1607-7970 (print), 2218-1903 (online)
Issue № 1, 2016 (January/February)
Pages 34 – 39

 

Authors
Yu.M. Vaskovskyi, S.S. Tsivinskiy
National Technical University of Ukraine «Kiev Polytechnic Institute»,
pr. Peremohy, 37, Kyiv, 03056, Ukraine,
e-mail: Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript

 

Abstract

In the operation of powerful turbogenerators (TG) there are cases of damage of the end wedges and related areas of the rotor teeth. Increased of damages of these elements caused by physical processes that occur in the rotors of TG in the asynchronous and asymmetric modes. At the ends of the rotor induced currents consistently cross over from teeth to end wedges through their contact surfaces. On these surfaces, there is a large current density and local heating. The study of these phenomena can be doing only on the basis of the field mathematical models. The purpose of this paper is to develop a three-dimensional mathematical model of the electromagnetic processes in the end zones of the rotor TG in asymmetrical modes and carrying relevant studies . The results of modeling are: the distribution of eddy currents and losses in the contact zones of the end wedges and teeth, technical solutions for their decreasing. References 7, figures 8.

 

Key words: turbogenerator, end rotor zone, end rotor wedges, three-dimensional mathematical model of the field.

 

Received:    02.04.2015
Accepted:    15.10.2015
Published:   29.01.2016

 

References

1. Vaskovskyy Yu.N., Tsivinskyy S.S., Gaidenko Yu.A. Optimization of the end wedges of the rotor turbogenerator to improve the reliability of its work in the single-ended modes. // Electrical engineering & Electromechanics.  2004.  No 3.  P. 26 - 28. (Rus)
2. Vaskovskyy Yu.M., Tsivinskyy S.S., Tytko A.I. The end wedge of the rotor of turbogenerator. Patent UA No 52366. 2010. (Ukr)
3. Schastlivyi H.H., Tytko O.I., Vaskovskyy Yu.M., Akhremenko V.L. Physical processes in the rotor of the electrical machines and methods of improve their reliability. Pratsi Instytutu Elektrodynamiky Natsionalnoi Akademii Nauk Ukrainy.  2010.  No 26.  P. 105-113. (Ukr)
4. Liang Y.P., Lu Y.P., Zhu K.N., Ge B.J., Cai W. Analysis and computation of 3D eddy current in turbogenerator rotor end region at asynchronous operation. IEEE International IEMDC 03, Madison, USA, 1-4 June 2003.  Vol. 1.  P. 578 - 562.
5. Pantelyat M.G., Saphonov A.N., Shulzhenko N.G. Finite element analysis of the electromagnetic field in synchronous turbogenerator rotor slot wedges. Proc. of the 14th International IGTE Symposium on Numerical Field Calculation in Electrical Engineering, Graz, Austria, September 2010.  P. 76 - 80.
6. Riley C.P. Negative sequence losses in turbine generator rotors. XX International Conference Electrical Machines (ICEM), Marseille, France, 2-5 September 2012.  P. 1364 - 1368. DOI: https://doi.org/10.1109/ICElMach.2012.6350055
7. Takahashi K., Hattori K., Nakahara A., Saeki M. Three dimensional harmonic field and eddy current analysis for rotor end region of turbine generator. IEEE International Conference  Electric Machines & Drives (IEMDC '07), Antalya, Turkey, 3-5 May 2007.  Vol. 1.  P. 477 - 481.  DOI: https://doi.org/10.1109/IEMDC.2007.382714

 

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