Theoretical study on vibration behavior of stator of 202MVA large turbo-generator

Author

Molki, Hamed ; Bahemmat, Pouya ; Kharamani, Ali Ashraf

fYear

2011

fDate

18-19 Oct. 2011

Firstpage

1

Lastpage

5

Abstract

Stators of large turbo-generators experience a number of electromagnetic forces which may lead to not only violent vibration causing damage within stator windings but also noise emission. Therefore, an accurate computation of the resonant frequencies of stators seems to be very essential. The Ritz method is employed in the present analysis to drive the governing equation of the stator. Stator is modelled as a three dimensional thick shell representing stator core with stator bars, pressure bars and suspension rings as radial and circumferential stiffeners. In the present paper, resonant frequencies and vibration characteristics of a stator are investigated and compared with the available experimental data.

Keywords

bars; elasticity; machine theory; magnetic cores; magnetic forces; stators; suspensions (mechanical components); turbogenerators; vibrations; MVA large turbogenerator; Ritz method; circumferential stiffener; electromagnetic force; noise emission; pressure bar; radial stiffener; resonant frequency computation; stator bar; stator core representation; stator winding; suspension ring; three dimensional thick shell; vibration behavior; Equations; Generators; Resonant frequency; Stator cores; Stator windings; Vibrations; Ritz method; Stator vibration; energy method;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermal Power Plants (CTPP), 2011 Proceedings of the 3rd Conference on

Conference_Location

Tehran

Print_ISBN

978-1-4799-0591-1

Type

conf

Filename

6576969