Abstract
As a new type of suspension bearing, Magnetic-Liquid Double Suspension Bearing (MLDSB) is mainly supported by electromagnetic suspension and supplemented by hydrostatic supporting. Its bearing capacity and stiffness can be greatly improved. Because of the small liquid film thickness (it is smaller 10 times than air gap), the eccentricity, crack, bending of the rotor, and the assembly error, it is easy to cause a clearance-rubbing fault between the rotor and stator. The coating can be worn and peeled, the operating stability can be reduced, and then it is one of the key problems of restricting the development and application of MLDSB. Therefore, the clearance-rubbing dynamic equation of 2-DOF system of MLDSB is established and converted into Taylor Series form and the nonlinear components are retained. Dimensionless treatment is carried out by dimensional normalization method. Finally, the rotor displacement response under different rotor eccentricity ratio and rotating speeds is numerically simulated. The studies show that the trajectory of the rotor is periodic elliptic without clearance-rubbing phenomenon when the eccentricity ratio is less than 0.2, while the rotor is greatly affected by the rotation speed and a variety of motions, such as single-period, quasi-period, double-period and chaos, are presented when greater than 0.3. Within the largest range of rotating speed and eccentricity ratio, the rotor presents the single-period trajectory, and then the number of Poincare mapping point is 1, without a clearance-rubbing fault. When the rotational speed is in the scope of (9, 13) krpm and the eccentricity ratio is in the scope of (0.27, 0.4), the number of Poincare mapping point is more than one, the maximum dimensionless rubbing force is −5.7, and then clearance-rubbing fault occurs. The research can provide a theoretical basis for the safe and stable operation of MLDSB.
Highlights
The active electromagnetic bearing (AMB) has many defects, such as the insufficient electromagnetic attraction caused by the magnetic pole magnetic saturation, the higher temperature rise in the magnetic pole/coil caused by the copper loss and the eddy current loss [1,2], the bearing characteristics of operation stability of AMB can be limited, and it becomes “technical bottleneck”, which restricts the further development and application promotion of AMB [3,4]
The adapting principle of Magnetic-Liquid Double Suspension Bearing (MLDSB) is shown as Figure 5
Bularevich et al [15] analyze analyzed regularities of the possible separation results showed that the Variational Mode Decomposition (VMD) method can effectively analyze the partial rubbing phenomenon in a constant andand slightly variable speed operation
Summary
The active electromagnetic bearing (AMB) has many defects, such as the insufficient electromagnetic attraction caused by the magnetic pole magnetic saturation, the higher temperature rise in the magnetic pole/coil caused by the copper loss and the eddy current loss [1,2] (the faults of AMB are shown as Figure 1), the bearing characteristics of operation stability of AMB can be limited, and it becomes “technical bottleneck”, which restricts the further development and application promotion of AMB [3,4]. AMB to to form form the the novel novel suspension suspension bearing-Magnetic-Liquid. The bearing capacity and stiffness canand be advantages of system hydrostatic system [6]. The bearing bearing capacity and stiffness can be improved drastically [7]. Stiffness can be improved coupling, MLDSB composed multi-diameter shaft, journal bearing unit, is composed. MLDSB is composed of of aa bracket, bracket, motor, motor, coupling, coupling, multi-diameter multi-diameter shaft, shaft, journal journal bearing bearing unit, unit, axial bearing unit, journal loading motor, axial loading motor, etc., as in [8]. Axial axial bearing bearing unit, unit, journal journal loading loading motor, motor,axial axialloading loadingmotor, motor,etc., etc.,as asininFigure
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