Title :
Theoretical study on vibration behavior of stator of 202MVA large turbo-generator
Author :
Molki, Hamed ; Bahemmat, Pouya ; Kharamani, Ali Ashraf
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;
Conference_Titel :
Thermal Power Plants (CTPP), 2011 Proceedings of the 3rd Conference on
Conference_Location :
Tehran
Print_ISBN :
978-1-4799-0591-1
