Vibration characteristic analysis of rotor rub-impact fault under air-gap mixed eccentricity of motor

Xin Tong; Rui Zhu; QingPeng Han; KeYuan He

doi:10.1117/12.2681825

16 June 2023 Vibration characteristic analysis of rotor rub-impact fault under air-gap mixed eccentricity of motor

Xin Tong, Rui Zhu, QingPeng Han, KeYuan He

Proceedings Volume 12639, Third International Conference on Mechanical Design and Simulation (MDS 2023); 126393C (2023) https://doi.org/10.1117/12.2681825
Event: Third International Conference on Mechanical Design and Simulation (MDS 2023), 2023, Xi'an, China

Abstract

The air gap eccentricity fault of the motor will cause the distortion of the air gap magnetic field of the motor, so that the resultant force of the magnetic pull on the rotor circumferential direction is not zero, and the resultant force is unbalanced magnetic pull. Unbalanced magnetic pull will aggravate the vibration of the motor rotor, and even cause rub-impact fault between the rotor and stator, which will affect the safe and stable operation of the motor. In this paper, a rotor rub-impact fault model with air-gap mixed eccentricity is established, and then the rotor dynamic equation is solved by numerical simulation. The dynamic characteristics of the rotor under different fundamental MMF (Magnetic Motive Force) are compared by time domain waveform, spectrum, axis trajectory, Poincare map and bifurcation diagram. The results show that there is no rub-impact fault in the rotor system at low speed, and the unbalanced magnetic pull will make the rotor produce zero frequency, fundamental frequency and second harmonic components; with the increase of rotating speed, rub-impact fault occurs in the rotor system. At this time, the existence of unbalanced magnetic pull enhances the nonlinear characteristics of the rotor.

Citation Download Citation

Xin Tong, Rui Zhu, QingPeng Han, and KeYuan He "Vibration characteristic analysis of rotor rub-impact fault under air-gap mixed eccentricity of motor", Proc. SPIE 12639, Third International Conference on Mechanical Design and Simulation (MDS 2023), 126393C (16 June 2023); https://doi.org/10.1117/12.2681825

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