| With the increasing of energy crisis and environmental problems, wind energy that isabundant and clean has attracted growing attention. Wind power is major application inwind energy developing field, which has experienced rapid development in recent decades,and permanent magnet wind turbine generator is one of the main development direction ofwind motors. Permanent magnet wind turbine generator is one of the main developmenttendencies of wind motors. The establishment of a permanent magnet motor’s magneticfield needn’t external excitation, which can make its’ structure simple, its’ size smaller, its’reliability and efficiency improve significantly. Especially, the emergence of the rare earthpermanent magnetic material, particularly, the declining prices, which provide thepermanent magnet motor with a broad development prospect.The paper has undertaken finite element analysis of the major component of2.5MWpermanent magnetic wind power generator, which based on the three dimensional modelingsoftware Solidworks and finite element analysis software ANSYS. On the premise that theunit should be guaranteed the safe operation, it has provided large-scale permanentmagnetic wind power generator with strong support and has the positive significance toenhance the efficiency of the unit.In the paper, the structure of permanent magnetic wind power generator can be dividedinto two parts, the first research is about the rotating parts of the motor. According to thedrawing, using ANSYS’s APDL command flow to set up rotation shaft entity model.deflection analysis was carried out the rotating shaft in order to avoid the phenomenon thatthe rotor and stator rubbed each other for not enough strength. The results showed that therotating shaft’s deflection met the requirement. Secondly, it concluded that the first ordercritical speed of the rotor exceeded the working speed and the working speed has avoidedthe resonance frequency of the stator and the first order critical speed of the rotor by usingthe Blocks Lanczos method to analysis the modal of the rotation shaft, and resonancewouldn’t occur. On the basis of the symmetry type of the stamped steel structure, analyzingthe intensity of the stamped steel under two conditions that the plate groove installedmagnetic steel or not by using Solidwork software to set up the finite element modal of thestamped steel.The results found that the stress was larger and concentrated on the roundedcorners when the plate groove installed magnetic steel and the intensity didn’t meet therequirement. Finally, it is done mechanical calculation for the stator of generator. Analyzing themodal of engine base without end cover in order to induce the vibration and the noise ofpermanent magnet motor and avoid resonance in the unit. Due to the end cover wasconnected with the engine base by bolts; it had the effect of constraints on the engine base,which affected the vibration characteristics of the engine base. And then analyzing themodal of engine base with end cover, it found that the end cover could improve thevibration characteristics of the engine base by comparing the two results of analysis. In theconsideration that the engine base would be effected by lots of load in the process ofhoisting and working, analyzing the stress and strain of the engine base in the process ofkeeping the whole machine flat, lifting the four corners at the same time, diagonal liftingand running, the result shown that the structure met the design requirement, lifting the fourcorners at the same time is benefited for motor hoisting.Compared with the traditional method, the finite element analysis method is simpleand high efficiency, by which it could predict the stress danger zone of structure andresonance would happen or not, then preventive measures could be taken. Providingguiding suggestions for the safe operation and large-scale of the unit helped the researchand development of the same kind of motor. |
PDF Full Text Request