Study On Oscillations Of Stator And Rotor Coupling Rigid Model Of Dynamo Forced By Electromagnetic

As driving device, the application of motor has been arising widely. And with the developing economy, the motor becomes large or ultra-large, the internal structure complicated constantly. The problem of vibration and noise is more and more prominent. The principle of motor must be lucubrated. Therefore this thesis makes researches on the stator and rotor coupling rigid model when the generator starts up in frequency conversion. The results can provide theoretical reference to the design of generator. The main woke can be outlined as follow:Firstly, basic on the actual structure, the stator and rotor coupling rigid model of generator has been established. The electromagnetic magnetic potential of the three-phase asynchronous has been obtained when the generator starts up in frequency conversion and high harmonic magnetometive force has been expressed, especially when the air gap exists. Considering the effects of processing technology, to the difference vibration, we get the magnetic energy expression in the low order.Secondly, to the model established and the parts of the magnetometive force, we analyze the fundamental resonance of the model. Though the response equations, we get stability of the steady-state solution. And the effect of electro-magnetic stiff to inherent frequency has been analyzed, as well as the effect of electromagnetic damping and mass to resonance.The inherent frequency of the vibration of radial and torsion has been calculated by using Lagrange equation analysis of system. Meanwhile, we analyze the nonlinear vibrations of the two vibration modes; get the steady-state solution by the method of energy.Finally,the frequency response curves of double and triple resonances have been acquired. And the transient process curve gotten is verification, as well as the effects of electromagnetic damping and electromagnetic force to the triple resonance have been analyzed.