Research On Virtual Prototyping Of Rotor Structure Of Large Turbine-Generator

The role of the steam turbine rotor is to transfer the load torque. The rotor windingis fixed in the rotor body. When the excitation current transflux, the rotor winding,strongmagnetic field is generated on the rotor body. It forms closed loop (i.e.main magneticflux) that the most of rotating magnetic field goes through the rotor core, the air gap andthe stator core; A small portion of the magnetic flux through the rotor body and the airgap form a loop that is the rotor leakage fiux.The virtual prototype technology is used design and analyze the rotor system of300MW、600MW and1000MW large turbine generator. First, Pro/E software is used toestablish the overall rotor model, in order to deeply understand the rotor structure,obtainrelevant parameters, and to establish the finite element model of the rotor structure,These provide the necessary aid for the design and manufacturing of rotor.Then, the finite element model of the rotor struture in ANSYS is established undervarious working conditions. The modal analysis, critical speed and harmonic responseanalysis are done, and compared with the results obtained under various workingconditions. In this paper, the modal simulation and harmonious response analysis aboutrotor structure system of the600MW and1000MW large turbine generator are done.The rotor bearing is simulated under three cases respectively:that is,the bearing isconsidered a fixed support,simulated by Combin14element and simulated byCombin214.For these three cases,the solid elements model and beam element model ofrotor structure is used to calculate and analyze respectively.Finally, machining simulation of the rotor of300MW、600MW and1000MWgenerator is processed by means of NC module of Pro/E software.By Processinggenerated G-code,and the3D rotor modal created in Pro/E software is put into processingsoftware Vericut.Under the maching simulation for contour and slot of rotor is carried outin Vericut.Through this topic research, the critical speed and transient response curve of thegenerator rotor under different working conditions have been obtained, and through theanalysis of the results, and drawn the many valuable conclusions. To make natural frequencies of rotor of large turbine generator avoiding electromagnetic vibrationfrequencies and working frequency it provides the effective method.In order to masterand optimize dynamic performance of rotor of generator it provides reference,for largeturbine generator rotor design, manufacturing technology, the online monitoring and faultdiagnosis it provides an important basis.