A Novel Electromagnetic Negative Stiffness Vibration Isolator with High Radial Stability

Abstract

The invention discloses a novel electromagnetic negative stiffness vibration isolator with high radial stability, which comprises a stator housing (2), a mover (6), and a coil wound around the longitudinal axis of the mover (6). (3), also including permanent magnets (7) arranged on the first layer and permanent magnets (7) arranged on the second layer along the longitudinal axis of the stator housing (2), the permanent magnets (7) of the first layer and The permanent magnetic field polarity end face of the permanent magnet (7) of the 2nd layer faces radial direction, and the polarity of the permanent magnet (7) of the 1st layer is opposite to the polarity of the permanent magnet (7) of the 2nd layer; (6) The polarity of the upper end is the same as the polarity of the adjacent polarity end face of the permanent magnet (7) of the first layer; 7) The polarities of the adjacent polarity end faces are the same and mutually repel the energization direction. The repulsive force between the permanent magnet and the mover not only ensures the negative stiffness, but also restrains the bias of the mover.

Description

technical field [0001] The invention relates to the field of vibration isolator design, and relates to a novel electromagnetic negative stiffness vibration isolator with high radial stability. Background technique [0002] The quasi-zero stiffness vibration isolation technology can provide a lower dynamic stiffness on the premise of ensuring a higher static stiffness, thereby not only ensuring the static support stability of the system but also achieving a lower first-order natural frequency, and the low-frequency vibration isolation effect of the system better. Considering the superior performance of the quasi-zero stiffness vibration isolator, it has received more and more research and exploration in recent years. Traditional quasi-zero-stiffness vibration isolators mostly use a spring combination structure or a permanent magnet combination spring to achieve the negative stiffness effect, but the non-adjustability of the achieved negative stiffness limits its application ...

AI Technical Summary

Problems solved by technology

Traditional quasi-zero-stiffness vibration isolators mostly use a spring combination structure or a permanent magnet combination spring to achieve the negative stiffness effect. However, the non-adjustability of the achieved negative stiffness limits its application to a certain extent.

[0003] In order to solve the problem that the negative stiffness of the traditional quasi-zero stiffness vibration isolator cannot be adjusted, the invention authorized by the announcement number CN105485230B proposes an electromagnetic semi-active vibration isolator that uses an asymmetrical magnetic tooth structure to achieve quasi-zero stiffness characteristics. Its positive stiffness Provided by an array of helical springs, the negative stiffness is realized through an asymmetrically dislocated magnetic tooth structure, and the magnitude of the negative stiffness can be adjusted by changing the current, which can better solve the vibration problem of variable working conditions

[0004] The core technology of the negative stiffness achieved by this invention is to use "electromagnetic attraction" to construct the axially unstable force between the mover and the stator. However, there is a radial electromagnetic pull between the mover and the stator. Due to the processing and installation accuracy In the case of high current, the system is very prone to radial bias, and the radial stability is poor, which leads to contact friction or even collision between the mover and stator, which greatly reduces the vibration isolation performance of the system

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