Permanent Magnetic Bearing Squeeze Film Damper

Abstract

The invention discloses a permanent magnet bearing squeeze oil film damper which comprises an oil film shaft neck, a bearing outer ring, a bearing inner ring and a lubricating oil cavity full of lubricating oil, wherein the bearing inner ring is sleeved on a shafting, the bearing outer ring and the oil film shaft neck are both located inside the lubricating oil cavity, and the bearing outer ring is fixedly arranged on the inner side of the oil film shaft neck. The permanent magnet bearing squeeze oil film damper further comprises an elastic squirrel-cage bar, wherein one end of the elastic squirrel-cage bar is located outside the lubricating oil cavity and is fixed, and the other end of the elastic squirrel-cage bar is fixedly connected with the oil film shaft neck. The bearing inner ring and the bearing outer ring are both magnetized in the radial direction, the opposite surface of the magnetized bearing inner ring and the opposite surface of the magnetized outer ring have like magnetic poles, and a gap is formed between the bearing inner ring and the bearing outer ring. The permanent magnet bearing squeeze oil film damper can improve damping ability and radial supporting stiffness.

Description

technical field [0001] The invention relates to a squeeze oil film damper for a permanent magnetic bearing, 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, the upper end of the rotor is often used figure 1 The suspended Squeeze Film Damper shown dampens vibrations in the system. But this kind of damper has two disadvantages: 1) The radial stiffness it can provide is too small and the anti-overturning ability is poor, which causes the flywheel shafting to tilt too much when it is working, and it is easy to cause the motor magnetic field to change drastically along the axial direction. 2) The damping provided is too small, and the excess energy of the shafting cannot be dissipated when the system moves at a low frequency. Therefore, the...

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Problems solved by technology

But this kind of damper has two disadvantages: 1) The radial stiffness it can provide is too small and the anti-overturning ability is poor, which causes the flywheel shafting to tilt too much when it is working, and it is easy to cause the motor magnetic field to change drastically along the axial direction. 2) The damping provided is too small, and the excess energy of the shafting cannot be dissipated when the system moves at a low frequency. Therefore, the damper that can provide greater radial stiffness and damping capacity will have important industrial application value

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