Abstract
Based on the combination of elastohydrodynamic lubrication and contact deformation theory, i.e. fluid-solid coupling theory, and considering the surface roughness of stator and rotor, a three-degree-of-freedom vibration model of spherical bearings with spiral grooves is established. The finite difference method is used to calculate and analyze the distribution of lubricating film pressure, film thickness and the influence of eccentricity of rotor on film pressure. Combining the stiffness of lubricating oil film with the finite element method, the displacement, stator vibration speed, acceleration and displacement of lubricating oil film are calculated from the angle of elastic boundary, and compared with the slotless structure. The results show that the bearing capacity of lubricating oil film of spherical bearing is improved and the stability of continuous oil film is improved by adding spiral groove. Secondly, the vibration characteristics of stator and rotor with spiral groove structure are more in line with the viscoelastic periodic distribution law. The vibration stability of the system is improved. In order to further optimize the vibration stability of the motor, the theoretical basis is provided.
Highlights
The three-degree-of-freedom motor with liquid suspension adopts spherical structure in both stator and rotor
By establishing the analysis model of spherical bearing, taking the parameters affecting the bearing performance and oil film thickness as variables, changing the parameters, analyzing the changes of various indicators of spherical bearing
Similar to the spiral groove structure, the dynamic pressure effect of inner-ring rotors causes the dimensionless oil film pressure to rise rapidly, there is a certain pressure difference between the grooved oil chamber and the grooveless area, and the processing accuracy of stator and rotor cannot meet the requirements of surface roughness, which results in the periodic deviation of measuring vibration acceleration
Summary
The three-degree-of-freedom motor with liquid suspension adopts spherical structure in both stator and rotor. The roughness of stator and rotor spherical shell surface is a factor that needs to be overcome in the optimization design of motor structure. The lubricating fluid of a three degrees of freedom motor with liquid suspension can be regarded as the elastic boundary between the stator spherical shell and the rotor. With the continuous improvement of structural optimization design, more and more researchers found that increasing the elastic boundary can effectively reduce the vibration of the shell [21]. A spiral groove oil chamber is added in the spherical bearing structure to ensure a good lubrication effect between the stator and rotor. The theoretical basis for further optimization of bearing lubrication performance is verified by experiments
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