Rotor vibration analysis of off-grid PMSG considering axial eccentricity and load variability

This paper presents a comprehensive investigation into the effects of key operational parameters under axial eccentricity (AE) on the mechanical behavior of the rotor in permanent magnet synchronous generators (PMSGs). The parameters studied include the degree of AE, load size, and power factor. The rotor’s mechanical behaviors analyzed encompass unbalanced magnetic pull (UMP) and vibration responses. The research combines theoretical analysis, finite element analysis (FEA), and experimental validation. The findings indicate that UMP becomes significant under AE conditions, with a dominant frequency at 100 Hz. Moreover, as the degree of AE or the power factor increases, the 100 Hz of UMP and vibration responses also intensify. In contrast, larger load sizes result in reduced UMP and lower vibration amplitudes.