Permanent Magnetic Bearing Squeeze Film Damper with Elastic Ring

Abstract

The invention discloses a permanent magnet bearing squeeze film dumper with an elastic ring, which comprises a bearing outer ring, a bearing inner ring fixedly sleeved on a shaft system, and a lubricating oil cavity filled with lubricating oil, as well as the elastic ring, wherein the bearing outer ring is mounted in the lubricating oil cavity; the bearing inner ring and the bearing outer ring are radially magnetized, resulting in that the opposite surfaces of the both are like in poles; a gap is reserved between the bearing inner ring and the bearing outer ring; and the inner ring of the elastic ring is propped against the outer ring of the bearing outer ring, while the outer ring of the elastic ring is propped against the lubricating oil cavity. The permanent magnet bearing squeeze film dumper can improve radial bearing rigidity, provides larger damping ability, and is compact in structure.

Description

technical field [0001] The invention relates to a permanent magnetic bearing extrusion oil film damper with an elastic ring, which belongs to the technical field of non-contact bearing dampers. Background technique [0002] At present, in order to ensure the safe and stable operation of the shaft system, in various high-speed vertical rotating machines such as centrifuges, turbines, and energy storage flywheels, a suspended squeeze oil film damper is often used on the upper end of the rotor to reduce the vibration of the system. , but this kind of damper has three disadvantages: 1) The radial stiffness it can provide is too small and the anti-overturning ability is poor, resulting in too large inclination angle of the flywheel shafting during operation, which is easy to cause the motor magnetic field to change drastically along the axial direction. Cause low-frequency precession phenomenon; 2) The damping provided is too small, when the system has low-frequency precession, t...

AI Technical Summary

Problems solved by technology

[0002] At present, in order to ensure the safe and stable operation of the shaft system, in various high-speed vertical rotating machines such as centrifuges, turbines, and energy storage flywheels, a suspended squeeze oil film damper is often used on the upper end of the rotor to reduce the vibration of the system. , but this kind of damper has three disadvantages: 1) The radial stiffness it can provide is too small and the anti-overturning ability is poor, resulting in too large inclination angle of the flywheel shafting during operation, which is easy to cause the motor magnetic field to change drastically along the axial direction. Cause low-frequency precession phenomenon; 2) The damping provided is too small, and when the system appears low-frequency precession, the excess energy of the shafting cannot be dissipated; 3) The volume is large and the machining accuracy is high

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