Abstract
Magnetic liquid double suspension bearing (MLDSB) includes electromagnetic system and hydrostatic system, and the bearing capacity and stiffness can be greatly improved. It is very suitable for the occasions of medium speed, heavy load, and starting frequently. Due to the mutual coupling and interaction between electromagnetic system and hydrostatic system, the probability and degree of static bifurcation are greatly increased and the operation stability is reduced. And flow of bearing cavity, coil current, oil film thickness, and galvanized layer thickness are the key parameters to ensure operation safe and stable, which has an important influence on the static bifurcation behavior. So this article intends to establish the coupling model of MLDSB to reveal the range of parameter combination in the case of static bifurcation. The influences of different parameter groups on the singularity characteristics, phase trajectory, x − t curves, and suction basin of the single DOF bearing system are analyzed. The result shows that there are nonzero singularities and static bifurcation occurs when ε 2 > 0 or δ 2 > 0 . As the flow of bearing cavity, coil current, oil film thickness, and galvanized layer thickness changes in turn, the singularities will convert between stable focus, unstable focus, stable node, and saddle point, and then the stable limit cycle may be generated. The attractiveness of singularity will change greatly with the flow of the bearing cavity and coil current changes slightly in the case of small current or large flow. The minimal change of galvanized layer thickness will lead to the fundamental change of the final stable equilibrium point of the rotor, while the final equilibrium point is slightly affected by the oil film thickness. This study can provide a reference for the supporting stability of MLDSB.
Highlights
Hydrostatic bearing is introduced into electromagnetic bearing to form Magnetic liquid double suspension bearing (MLDSB), and its supporting form is electromagnetic suspension with hydrostatic pressure auxiliary
The paper presents the static bifurcation behavior of MLDSB affected by design parameters
The singularity characteristics, phase trajectory, x − t curves, and suction basin of the single DOF bearing system are analyzed to verify the accuracy of the theoretical calculation
Summary
Hydrostatic bearing is introduced into electromagnetic bearing to form MLDSB, and its supporting form is electromagnetic suspension with hydrostatic pressure auxiliary It has the advantages of nonmechanical contact, high supporting capacity and stiffness, and operation stability and the service life can be efficiently improved. Due to the coupling and interference between the nonlinear electromagnetic system and the nonlinear hydrostatic system, the probability and complexity of static bifurcation are improved, and the reliability and operation stability of MLDSB can be decreased sharply [4]. The design and operation parameters (flow of bearing cavity, coil current, oil film thickness, and galvanized layer thickness) are the premise and foundation of high-performance bearing and stable suspension of MLDSB and have a significant influence on the static bifurcation behavior of MLDSB. Supporting system, and the reference can be provided for the design and supporting stability of MLDSB
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