Electromagnetic Semi-Active Vibration Absorber with Asymmetric Pitch in Series

Abstract

The invention aims to provide a serially-connected electromagnetic semi-active vibration absorber with asymmetrical tooth pitches. The serially-connected electromagnetic semi-active vibration absorber comprises vibration absorber units, wherein each vibration absorber unit comprises an upper end cover, a lower end cover and stator sleeves; the stator sleeves are respectively connected with the upper end cover and the lower end cover, so as to form a frame; a rotor is mounted in the frame; a rotor shaft penetrates through the middle part of the rotor, the upper end of the rotor shaft is positioned above the upper end cover, and the lower end of the rotor shaft is positioned at the lower end cover, and the rotor shaft is in interference fit with the rotor; annular grooves are formed in the outer surface of the middle part of the rotor, and excitation coils are mounted in the annular grooves; and holes are formed in the stator sleeves, and leading wires are connected with the excitation coils, and penetrate out of the holes. Aiming at the defects in the prior art, the invention provides the vibration absorber which can vibrate controlled objects with different qualities so as to realize the function of series connection of a plurality of vibration absorbers, optimal tooth width ratio, which enables optimum performance of the vibration absorber to be exerted, is adopted, electromagnetic force is improved by more than one time than that of a conventional electromagnetic semi-active vibration absorber, and protection measures for failure of the vibration absorber are added.

Description

technical field [0001] The invention relates to a vibration damping device. Background technique [0002] Harmful vibration not only affects the life of equipment, but also reduces the measurement accuracy of instruments and meters, and affects the normal work of operators. In order to suppress harmful vibration, people have carried out a lot of research. In the field of vibration control engineering, dynamic vibration absorbers are commonly used to suppress the vibration of the controlled object. The working principle of the dynamic vibration absorber is to attach a structure with mass and stiffness to the controlled object, through the vibration of the additional structure, the vibration energy of the controlled main vibration system can be transferred, so as to achieve the purpose of vibration absorption. For a dynamic vibration absorber that can usually be simplified as a single-degree-of-freedom mass-spring system, when the natural frequency of the vibration absorber i...

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Problems solved by technology

However, the above-mentioned patents mainly have three deficiencies: First, because the mass ratio of the vibration absorber to the controlled object meets a certain characteristic range, the vibration-absorbing effect is obvious

Therefore, this research, like most other related research, can only be applied to controlled objects with a specific quality range. When the controlled main vibration system is aimed at different masses, it is necessary to redesign and manufacture the vibration absorber; secondly, in the electromagnetic vibration absorber The force-displacement characteristic of the "electromagnetic spring" has a great relationship with the size of the ring gear structure. The ring gear structure size of the existing electromagnetic vibration absorber adopts a tooth width ratio of 0.5. After research by the inventor, it is found that this The tooth width ratio is unfavorable to the performance of the shock absorber; third, there is a lack of actuator fault protection measures

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