Estimation of Acoustic Noise and Vibration in an Induction Machine Considering Rotor Eccentricity

In this paper, a static rotor eccentricity analysis method is proposed. Electromagnetic noise by static eccentricity occurs in the course of manufacturing. The increase in errors is attributed to manufacturing errors of the components: the assembly and the torsional errors caused by shrink fitting. For these reasons, the rotor is displaced from the center of the stator bore, but it still turns on its own axis. Accordingly, in this paper, the acoustic noise using the electromagnetic excitation force was analyzed according to the rotor eccentricity. Finite-element analysis was used to analyze the rotor eccentricity considering the electrical and mechanical characteristics. To verify the proposed method, an induction machine was fabricated and an experiment was conducted.