Engineering Physics Annotation << Back The Influence of Static Eccentricity of the Rotorof a Squirrel-Cage Induction Motoron the Magnetic Noise Parameters Ermolaev A.I., Panovko G.Ya., Smirnov A.Yu., Titov D.Yu. The paper is devoted to the study of vibration and magnetic noise occurred in a squirrel-cage induction motor with a rotor static eccentricity. The relevance of the work is supported, on the one hand, by a decrease in the service life, electrical losses and deterioration of vibration-acoustic characteristics of electric motors with rotor eccentricity and, on the other hand, by insuffi cient description of this topic in domestic and foreign papers. A numerical fi nite element model of the AIR180M4U3 motor was developed, describing the interrelated electromagnetic, structural-mechanical and acoustic processes taking into account a static eccentricity of the rotor with an effective load torque equal to half of the nominal. The obtained results made it possible to establish the dependences of the magnetic noise level, stator vibration amplitude, acceleration time and mechanical stress on the rotor eccentricity radius. It was found that the greatest stator deformations in the AIR180M4U3 motor occur at a relative eccentricity of ε < 0.167 with oscillations of the order of r = 2 (oval-shaped mode) at a natural frequency of f = 160 Hz. An increase in ε to 0.25 was accompanied by an abrupt decrease in the amplitude of the harmonic f = 160 Hz and an increase in the infl uence of harmonics with r = 3, r = 4 and r = 6 (triangular, square and hexagonal-shaped mode, respectively), which is explained by the redistribution of radial magnetic forces acting on the motor stator due to a change in magnetic resistances in certain areas of the motor airgap. However, the levels of sound pressures and mechanical stresses decreased as the eccentricity radius increased. At the same time, a signifi cant increase in the transient acceleration time of the electric motor rotor was revealed with an increase in the relative eccentricity. Keywords: squirrel-cage induction motor, magnetic noise, rotor eccentricity, fi nite element method, numerical modeling, stator vibration. DOI: 10.25791/infizik.11.2024.1438 Pp. 30-40.