Eddy current damper of rotating mechanism

Abstract

The invention provides an eddy current damper of a rotating mechanism. The eddy current damper comprises a shell, a shell cover plate, a circular rack arranged in the shell in a penetrating mode, a permanent magnet unit in transmission connection with the circular rack and an annular conductor fixed in the shell; when the circular rack moves in the axial direction of the circular rack, the permanent magnet unit is driven to rotate, and the permanent magnet unit and the annular conductor generate relative movement. According to the eddy current damper, the use amount of permanent magnets is small, and the required damping force can be obtained through amplifying of the speed of the small number of permanent magnets through a rotating mechanism; the bearing capacity is large, the friction force is low, and the durability is high; the temperature stability is high, and the frequency application range is wide; a magnetic shielding measure is adopted, so that the influence of a magnetic field on the surrounding environment is small; the damping force can be adjusted by adjusting the magnetic field gap, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the field of structural and mechanical vibration reduction of buildings, bridges, structures, etc., and in particular relates to an eddy current damper for a rotating mechanism. Background technique [0002] A viscous damper is a velocity-dependent energy-dissipating device that slows down an object's velocity or vibration by converting kinetic energy into heat. As a damping unit, a viscous damper, a mass unit and a stiffness unit together constitute a tuned mass damper (Tuned Mass Damper, TMD), which uses an inertial system connected to a controlled structure to absorb structural vibration energy and generate resonance with a phase difference , to reduce the vibration of the structure due to the resonance effect, and the optimal vibration reduction efficiency can be obtained by adjusting the relationship between the parameters of these three units and the mass and natural frequency of the controlled structure. A traditional T...

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Problems solved by technology

[0003] The traditional liquid viscous damper has the following problems: 1) The damping force cannot be adjusted after installation; 2) The sealing ring is easy to wear during frequent work, resulting in oil leakage, which is a wearing part that needs to be replaced; 3) Because the sealing ring tightens the piston rod, Resulting in greater friction, the damper is not easy to start; 4) The external environment temperature change has a greater impact on the performance of the damper; 5) The internal temperature of the damper caused by long-term work has a greater impact on the performance of the damper

[0005] However, the plate type eddy current damper has the following problems: 1) It is difficult to ensure the size of the magnetic field gap when there is vibration perpendicular to the plane or curved surface of the permanent magnet and the conductor, the damping force is unstable, and the permanent magnet and the conductor are easily damaged when the magnetic field gap is small. Collision; 2) When the area of ​​the required permanent magnet and conductor is large, the magnetic field gap is difficult to guarantee and the damping force deviation is difficult to control due to processing and installation errors and self-weight deformation; 3) Due to problems 1) and 2), the magnetic field gap cannot If it is very small, the energy utilization rate of the magnetic field is not high; 4) The area is large and difficult to arrange; 5) The number of permanent magnets required is large, and the permanent magnets have a large suction force (the suction force of the larger permanent magnets is usually tens of kilograms), and it is difficult to install manually , Damage to the permanent magnet or injury often occurs during installation

[0009] At present, although some of the above-mentioned eddy current dampers have amplified the damping effect, their structures are relatively complex and their bearing capacity is low. Most of them adopt the transmission shaft normal plane rotation method, which has high requirements on the transmission structure, and the friction force is relatively large without lubrication. The wear is serious, the maintenance is difficult, and the damping force is difficult to adjust according to the debugging requirements of TMD

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