The Research On Stator Structure System Of Large Turbo-generator Based On Virtual Prototype

The vibration problems of stator system relate to sustainably, securely andstably running of the whole generator set when the large turbo-generator isrunning. On the basis of the finite element theory, the stator structure systems of600MW and1000MW large turbo-generators are researched in this paper using thevirtual prototyping technology. The main contents and results are as follows:Firstly, combined with a large number of data gathered about theturbo-generator, the stator structure systems of turbo-generator are analyzeddetailedly on the basis of600MW and1000MW large turbo-generators which arethe three largest domestic turbo-generator company’s productions. The virtualprototype models of the stator frames, the stator windings and vibration isolationsystems of600MW and1000MW large turbo-generators stator are createdrespectively in Pro/E.Then, the virtual prototype models of the stator frame, the stator windingsand vibration isolation system of600MW and1000MW turbo-generators stator arereasonably simplified and put into the ANSYS Workbench, and then their finiteelement models are created. The modal analyses of the stator frames, statorwindings in different constraints and the axial and tangential vibration isolationsystems under different working conditions are done; their natural frequencies andmodes are obtained. The purposes are to calculate the resonance frequencies of thestructures and make sure the natural frequencies of those structures effectivelyavoiding the50Hz working frequency and100Hz electromagnetic frequency,providing objective references to improve the dynamic characteristics of thestructures and subsequent optimization design. The harmonic response analyses ofthe stator frames, stator windings which the line segments are all constrained andinner stator vibration isolation systems are done; their amplitude and phasefrequency curves are obtained and the results’ reliability of the correspo ndingmodal analyses are verified.Finally, the equivalent simplified model of glass fiber reinforced epoxy resincone ring for composite cone ring of turbo-generator stator end is created inANSYS and its dynamic characteristics are analyzed, the corresponding naturalfrequencies and modes are calculated, and then its harmonic response analysis isdone. The virtual prototype model of manufacturing and enwinding equipment of cone ring is established in Pro/E and ADAMS, and its simulation enwinding isdone.This project has obtained many valuable conclusions through the introductionof virtual prototyping technology to the research on stator structure system oflarge turbo-generator. These provide an important reference for the design andmanufacture of large turbo-generator, and have very realistic significance toreduce manufacturing costs and the workload of the physical prototype in theturbo-generator’s design and development process, shorten the development cycle.