A systematic approach for analysing vibration-related problems of electrical machines, integrating both complex electromagnetic and rotordynamic analyses, is completely presented with an in-house finite-element solution module, formulated from related theories in rotordynamics. The electromagnetic analysis processes with the MagNet software are described herein to obtain the performance curves of electrical machines. They are integrated into the equation of motion to investigate the corresponding vibration characteristics. Based on the previously published work, the squirrel-cage-type induction motor is employed as an extended case study to demonstrate the integrated procedure. Three types of silicon steel core materials are considered in order to explore their effects in the dynamic properties of the system. Also, what happens on the vibration amplitude of rotor critical positions at the instant right before and after passing the critical speed are investigated thoroughly. The corresponding results exhibit that the complete procedures in using the proposed methodology can solve the reliability issues of electrical machines effectively.
In this paper, the influence degree of eccentricity distance and guide bearing stiffness change on the vibration characteristics of the unit under the condition of rotor mass misalignment is discussed respectively, and the modal characteristics of the unit are studied for the problem of generator mass eccentricity. First of all, the guide bearing is parameterized, the whole axle system modeling is calculated by FEM modal analysis method, the results of the analysis obtain the first 10th order critical frequency and vibration mode analysis results, further determine the danger point of displacement deformation concentration. Comparing the vibration type, critical frequency and center vibration trajectory of the guide bearing under different constraint conditions, the characteristics of the unit vibration caused by the rotor quality is: the axis tile gap is gradually enlarged due to the eccentric rotation of the rotor of the unit, and the vibration characteristics of the main frequency in the unit vibration signal are unchanged. The results are confirmed by field inspection data.
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