Study on dynamic characteristics of eccentric motorized spindle

In order to explore the dynamic behavior and motion law of motorized spindle under eccentric condition, a dynamic model of motorized spindle considering unbalanced magnetic pull under eccentric condition is established. The effect of gyroscopic moment is considered. The model is established by Lagrange method, and the model is simulated and analyzed. The law of rotor response change under different speed, unbalance and air gap changes is obtained. The simulation results show that the static eccentricity will increase the vibration of the motorized spindle. Under the same static eccentricity and mass eccentricity, the influence of static eccentricity on rotor decreases with the increase of rotating speed. Mass eccentricity is called the main influencing factor. In frequency domain analysis, when the static eccentricity occurs, the peak appears at 0Hz, which is the effect of unbalanced magnetic tension on vibration. With the increase of rotating speed, the frequency size of the peak value of fundamental frequency will also increase. The research results provide a theoretical basis for the in-depth analysis of the failure mechanism of rotating machinery.