Advanced Design Considerations for Permanent Magnetic Bearings: Bibliometric Insights and the Effects of Axial Displacement and Shaft Sagging on Horizontal Overhung Systems
Keywords:
Air gaps (h1), Axial displacement, Backers’s works, Shaft deflection,, Shaft flexibility factorAbstract
This study investigates the influence of axial displacement
and shaft sagging on the performance of permanent
magnetic bearings (PMBs) in horizontal overhung systems,
supported by a bibliometric analysis of existing PMB research
trends. The bibliometric review identifies dominant
modelling approaches and reveals limited attention to axial
displacement and shaft sagging effects in stacked PMB
configurations. To address this gap, a modified analytical
model based on Backers’s magnetic scalar potential method
is developed by incorporating axial displacement and shaft
sagging into the design framework. The proposed model is
validated through experimental investigation using a
horizontal overhung rotor system. The results show that the
combined effects of axial displacement and shaft sagging
significantly alter magnetic alignment and reduce effective
wavelength, leading to performance degradation. Statistical
equivalence testing confirms strong agreement between the
proposed formulation and established analytical models. The
findings provide improved design guidance for enhancing
PMB stability, reliability, and efficiency in practical rotating
machinery applications.
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