WO2022001905A1

WO2022001905A1 - Horizontal two-degree-of-freedom electromagnetic vibration isolation apparatus based on parallel connection of positive and negative stiffness of magnetic attraction force

Info

Publication number: WO2022001905A1
Application number: PCT/CN2021/102571
Authority: WO
Inventors: 崔俊宁; 赵亚敏; 邹丽敏; 边星元; 程钟义; 金明睿
Original assignee: 哈尔滨工业大学
Priority date: 2020-06-29
Filing date: 2021-06-26
Publication date: 2022-01-06
Also published as: CN111677798A

Abstract

A horizontal two-degree-of-freedom electromagnetic vibration isolation apparatus based on a parallel connection of positive and negative stiffness of a magnetic attraction force, comprising a stationary magnet fixing support (1), an X-direction magnetic spring (2), a Y-direction magnetic spring (3), a moving magnet mounting frame (4), and a load connecting member (5); the X-direction magnetic spring (2) and the Y-direction magnetic spring (3) are arranged vertical to each other and are connected in parallel; the X-direction magnetic spring (2) consists of a first stationary magnet (21), a first moving magnet (22), a second moving magnet (23), and a second stationary magnet (24) that are sequentially arranged in an array along an X axis, the first stationary magnet (21) and the first moving magnet (22) have an attractive effect, and the second moving magnet (23) and the second stationary magnet (24) have an attractive effect; and the Y-direction magnetic spring (3) consists of a third stationary magnet (31), a third moving magnet (32), a fourth moving magnet (33), and a fourth stationary magnet (34) that are sequentially arranged in an array along a Y axis, the third stationary magnet (31) and the third moving magnet (32) have an attractive effect, and the fourth moving magnet (33) and the fourth stationary magnet (34) have an attractive effect. The electromagnetic vibration isolation apparatus uses the design of a suspension structure without a guide mechanism, is low in natural frequency, high in magnetic material utilization rate, and high in design flexibility of the magnetic spring, and can achieve a horizontal two-degree-of-freedom low -frequency or ultra-low-frequency vibration isolation effect of a precise instrument.

Description

Horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction

technical field

The invention belongs to the technical field of precision vibration isolation, in particular to a horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction.

Background technique

In the process of installation, testing and experimentation of precision instruments and equipment, the interference of low-frequency micro-amplitude vibration in the environment has become one of the key issues affecting the research results. Equipping precision instruments and equipment with low-frequency vibration isolators has gradually become the field of precision engineering to suppress environmental micro-vibration. main technical means. Low-frequency vibration isolators mostly use positive and negative stiffness structures in parallel or in series to achieve vertical low-frequency vibration isolation effects, while horizontal low-frequency vibration isolators, especially electromagnetic vibration isolation devices that can achieve horizontal two-degree-of-freedom low-frequency vibration isolation effects are rare. .

Patent No. CN200910273183.3 discloses a horizontal two-degree-of-freedom vibration isolation mechanism. The horizontal two-degree-of-freedom vibration isolation mechanism is composed of four magnetic levitation units arrayed along the circumference of a disk. Each maglev unit is composed of a single-degree-of-freedom low-frequency vibration isolation structure composed of two positive and negative stiffness structures in parallel. The features of this technical solution are: 1) Both the positive stiffness structure and the negative stiffness structure of the magnetic levitation unit only use the force between the magnets to achieve positive stiffness characteristics or negative stiffness characteristics in a specific direction, and the utilization rate of magnetic materials is low. In the process of use, a motion guiding mechanism is required to constrain the movement of other degrees of freedom of the positive stiffness structure and the negative stiffness structure. The structure is complex, the volume is large, and the manufacturing cost is high; 2) The positive stiffness characteristics of the magnetic levitation unit are determined by the same pole magnets (electromagnets and permanent magnets). ) is realized by the repulsive force between ), and the negative stiffness characteristic is realized by the attractive force between the heteropolar magnets.

Patent No. CN201811427114.9 discloses a multi-dimensional magnetic negative stiffness mechanism and a multi-dimensional magnetic negative stiffness vibration reduction system composed thereof. The multi-dimensional vibration reduction system is composed of a positive stiffness mechanism and a multi-dimensional negative stiffness mechanism in parallel. The positive stiffness mechanism is a traditional elastic element used to connect the damped body and the mounting base, providing X-, Y- and Z-direction support and basic vibration damping functions; the multi-dimensional negative stiffness mechanism is a one-dimensional structure composed of homopolar magnets. The negative stiffness magnetic group is formed in series with the two-dimensional negative stiffness magnetic group. The features of this technical solution are: 1) The one-dimensional negative stiffness magnetic group utilizes the repulsive force between the magnets to generate negative stiffness characteristics in the Z direction, and its movement along the X and Y directions is restricted by a motion guiding mechanism such as a linear guide, and the magnetic material has a negative stiffness. The utilization rate is low, the structure is complex, the volume is large, and the manufacturing cost is high; 2) The negative stiffness characteristics of the one-dimensional negative stiffness magnetic group and the positive stiffness characteristics and negative stiffness characteristics of the two-dimensional negative stiffness magnetic group all use the repulsive force between the magnets of the same pole Realization, the positive stiffness value is large, and the natural frequency is high; 3) The one-dimensional negative stiffness magnetic group and the two-dimensional negative stiffness magnetic group can only be magnetized along a specific direction, and the structure design of the negative stiffness magnetic group is single.

To sum up, how to provide a horizontal two-degree-of-freedom electromagnetic vibration isolator with high utilization of magnetic materials and no need for a motion guide mechanism through the innovation of the structure and principle of the electromagnetic vibration isolator to reduce the interference of low-frequency and micro-amplitude vibration in the environment and ensure the precision The working environment of instruments and equipment is optimal, and it is of great significance to further improve the accuracy of precision instruments and equipment.

SUMMARY OF THE INVENTION

Aiming at the research on the influence of environmental vibration interference on precision instruments and equipment, and the problem that there are few electromagnetic vibration isolation devices that can realize the low-frequency vibration isolation effect of horizontal two degrees of freedom at present, the invention proposes a horizontal two degrees of freedom based on the parallel connection of positive and negative stiffness of magnetic attraction. Electromagnetic vibration isolation device, in the horizontal X direction, the negative stiffness generated by the X-direction magnetic spring and the positive stiffness generated by the Y-direction magnetic spring are used in parallel to achieve low-frequency vibration isolation effect; in the horizontal Y-direction, the positive stiffness generated by the X-direction magnetic spring and the The negative stiffness generated by the Y-direction magnetic spring is connected in parallel to realize the low-frequency vibration isolation effect. In the Z-direction, the positive stiffness generated by the X-direction magnetic spring and the positive stiffness generated by the Y-direction magnetic spring are used in parallel to achieve the effect of stably supporting the vibration isolation load. The horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction can effectively isolate the low-frequency micro-amplitude vibration interference of horizontal two-degree-of-freedom in the environment where the precision instrument is located, and further improve the precision of the precision instrument.

The technical solution of the present invention is:

A horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction, comprising a connection structure and a magnetic circuit structure, wherein the connection structure includes a fixed magnet fixing frame, a load connecting piece and a moving magnet mounting frame, and the fixed magnet fixing frame A cube structure with fixed holes at the top, the moving magnet mounting frame is a cube structure with a hole at the bottom, the top of the moving magnet mounting frame is fixedly connected to the bottom of the load connector, and the top of the load connector is fixedly connected to the vibration isolation load; the magnetic The circuit structure includes an X-direction magnetic spring and a Y-direction magnetic spring, the X-direction magnetic spring and the Y-direction magnetic spring are arranged vertically; the X-direction magnetic spring includes a first fixed magnet, a first moving magnet, a second magnetic spring arranged in an array along the horizontal X axis in sequence The moving magnet and the second fixed magnet. The first fixed magnet, the first moving magnet, the second moving magnet and the second fixed magnet are cubic permanent magnets. There is an attractive force between the magnet and the second fixed magnet. The X-direction gap between the first fixed magnet and the first moving magnet is equal to the X-direction gap between the second moving magnet and the second fixed magnet. The Y-direction magnetic spring includes a sequence along the horizontal Y-axis. The third fixed magnet, the third moving magnet, the fourth moving magnet and the fourth fixed magnet are arranged in an array, the third fixed magnet, the third moving magnet, the fourth moving magnet and the fourth fixed magnet are cubic permanent magnets, and the third fixed magnet There is an attractive force between the magnet and the third moving magnet, and there is an attractive force between the fourth moving magnet and the fourth stationary magnet. The Y-direction gap between the third stationary magnet and the third moving magnet is equal to the fourth moving magnet and the fourth stationary magnet. The Y-direction gap of the moving magnet; the first moving magnet, the second moving magnet, the third moving magnet and the fourth moving magnet are respectively fixedly connected to the four outer walls of the moving magnet mounting frame, the first fixed magnet, the second fixed magnet, the third fixed magnet The magnet and the fourth fixed magnet are respectively fixedly connected to the four inner walls of the fixed magnet fixing frame. The moving magnet installation frame is nested in the fixing hole at the top of the fixed magnet fixing frame in a way that the axes overlap, and the bottom of the moving magnet installation frame is fixed with the fixed magnet. There is a gap at the top of the rack.

Preferably, the first fixed magnet, the first moving magnet, the second moving magnet and the second fixed magnet are magnetized in the same direction along the horizontal X-axis.

Preferably, the first fixed magnet, the first moving magnet, the second moving magnet and the second fixed magnet are all magnetized along the horizontal Y-axis or Z-axis, and the magnetization direction of the first fixed magnet is the same as the magnetization direction of the second fixed magnet The same, and the magnetization directions of the first moving magnet and the second moving magnet are opposite.

Preferably, the third stationary magnet, the third moving magnet, the fourth moving magnet and the fourth stationary magnet are magnetized in the same direction along the horizontal Y axis.

Preferably, the third stationary magnet, the third moving magnet, the fourth moving magnet and the fourth stationary magnet are all magnetized along the horizontal X-axis or Z-axis, and the magnetization direction of the third stationary magnet is the same as the magnetization direction of the fourth stationary magnet The same, and the magnetization directions of the third moving magnet and the fourth moving magnet are opposite.

Preferably, the overall structure of the horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction is axisymmetric, and the fixing hole is a square hole.

The technical innovation of the present invention and the good effect produced are:

(1) The vibration isolation technical solution adopts the vertical arrangement and parallel connection of magnetic springs to realize the electromagnetic vibration isolation of horizontal two degrees of freedom, and at the same time realizes the high utilization rate of magnetic materials and the structural design of no guiding mechanism. The stiffness characteristics of the X-direction magnetic spring and the Y-direction magnetic spring with three degrees of freedom are connected in parallel to realize the parallel connection of positive and negative stiffness structures with two horizontal degrees of freedom and the effect of stably supporting the vibration isolation load in the Z-direction. The stiffness characteristics of the three degrees of freedom of the magnetic spring are all used. Therefore, the utilization rate of the magnetic material is significantly improved; the motion guide mechanism does not need to constrain the movement of the magnetic spring during actual use, and the structure design without the guide mechanism reduces the complexity, volume and manufacturing cost of the vibration isolation device. This is one of the innovative points of the present invention which is different from the prior art.

(2) The technical solution constructs a positive stiffness structure based on the gravitational action between the heteropolar magnets, which can realize the low stiffness characteristic of the horizontal two degrees of freedom and thus possess the low frequency vibration isolation capability of the horizontal two degrees of freedom. The positive stiffness characteristics of the X-direction magnetic spring and the Y-direction magnetic spring are both generated by the gravitational force between the magnets, which can solve the problem of the vibration isolation device caused by the large rigidity value of the positive stiffness structure of the magnetic repulsion force in the existing horizontal two-degree-of-freedom electromagnetic vibration isolation technical solution. The problem of high natural frequency can significantly reduce the stiffness of the vibration isolation device and the initial vibration isolation frequency, and achieve near-zero stiffness characteristics and near-zero frequency vibration isolation effects. This is the second innovative point of the present invention which is different from the prior art.

(3) The present invention can significantly improve the design flexibility of the magnetic spring. The X-direction magnetic spring can be composed of an array of magnets that are magnetized in the same direction along the horizontal X-axis and different in the horizontal Y-axis or Z-axis. It is composed of a magnet array; the magnetization directions of the magnetic springs are various, which breaks through the limitation of the single magnetization direction of the magnetic springs in the prior art solutions, and is suitable for occasions requiring different magnet shapes, magnetization processes and stiffness characteristics. This is the third innovative point of the present invention which is different from the prior art.

Description of drawings

Fig. 1 is the top view of the horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction;

Fig. 2 is a three-dimensional schematic diagram of a horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction;

Fig. 3 is the embodiment 1 of the sectional view of Fig. 1A-A;

Fig. 4 is the embodiment 1 of the sectional view of Fig. 1B-B;

Fig. 5 is the embodiment 2 of the sectional view of Fig. 1A-A;

Fig. 6 is the embodiment 3 of the sectional view of Fig. 1A-A;

Fig. 7 is the embodiment 2 of the sectional view of Fig. 1B-B;

FIG. 8 is Embodiment 3 of the cross-sectional view of FIG. 1B-B.

Description of the part number in the figure: 1 fixed magnet fixing frame, 2 X magnetic spring, 21 first fixed magnet, 22 first moving magnet, 23 second moving magnet, 24 second fixed magnet, 3 Y magnetic spring, 31 first Three stationary magnets, 32 third moving magnets, 33 fourth moving magnets, 34 fourth stationary magnets, 4 moving magnet mounting frames, and 5 load connectors.

detailed description

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

A horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction, comprising a connecting structure and a magnetic circuit structure, the connecting structure includes a fixed magnet fixing frame 1, a load connecting piece 5 and a moving magnet mounting frame 4, The magnet fixing frame 1 is a cube structure with fixing holes at the top, and the moving magnet mounting frame 4 is a cube structure with holes at the bottom. The vibration load is fixedly connected; the magnetic circuit structure includes an X-direction magnetic spring 2 and a Y-direction magnetic spring 3, and the X-direction magnetic spring 2 and the Y-direction magnetic spring 3 are arranged vertically; the X-direction magnetic spring 2 includes an array along the horizontal X axis. The first fixed magnet 21, the first moving magnet 22, the second moving magnet 23 and the second fixed magnet 24, the first fixed magnet 21, the first moving magnet 22, the second moving magnet 23 and the second fixed magnet 24 are cubic For permanent magnets, there is an attractive force between the first fixed magnet 21 and the first moving magnet 22, and an attractive force between the second moving magnet 23 and the second fixed magnet 24. The X of the first fixed magnet 21 and the first moving magnet 22 The directional gap is equal to the X-directional gap between the second moving magnet 23 and the second fixed magnet 24; the Y-directional magnetic spring 3 includes a third fixed magnet 31, a third moving magnet 32, and a fourth moving magnet 33 arranged in an array along the horizontal Y axis in sequence and the fourth fixed magnet 34, the third fixed magnet 31, the third moving magnet 32, the fourth moving magnet 33 and the fourth fixed magnet 34 are cubic permanent magnets, and there is an attractive force between the third fixed magnet 31 and the third moving magnet 32 There is an attractive force between the fourth moving magnet 33 and the fourth stationary magnet 34 , and the Y-direction gap between the third stationary magnet 31 and the third moving magnet 32 is equal to the Y-direction gap between the fourth moving magnet 33 and the fourth stationary magnet 34 ; The first moving magnet 22, the second moving magnet 23, the third moving magnet 32 and the fourth moving magnet 33 are respectively fixedly connected with the four outer walls of the moving magnet mounting frame 4, the first fixed magnet 21, the second fixed magnet 24, The third fixed magnet 31 and the fourth fixed magnet 34 are respectively fixedly connected to the four inner walls of the fixed magnet fixing frame 1 , and the moving magnet mounting frame 4 is nested in the fixing hole at the top of the fixed magnet fixing frame 1 in a way that the axes overlap, and the moving magnet mounting frame 4 There is a gap between the bottom of the magnet mounting frame 4 and the top of the fixed magnet fixing frame 1 , so that the bottom of the moving magnet mounting frame 4 does not contact the top of the fixed magnet fixing frame 1 , so as to avoid the nonlinear effect of mechanical friction on the precision vibration isolation.

As a specific embodiment, the first fixed magnet 21 , the first moving magnet 22 , the second moving magnet 23 and the second fixed magnet 24 are magnetized in the same direction along the horizontal X-axis.

As a specific implementation manner, the first fixed magnet 21 , the first moving magnet 22 , the second moving magnet 23 and the second fixed magnet 24 are all magnetized along the horizontal Y-axis or Z-axis, and the first fixed magnet 21 is magnetized along the horizontal Y-axis or Z-axis. The magnetization direction is the same as the magnetization direction of the second stationary magnet 24 and opposite to the magnetization directions of the first moving magnet 22 and the second moving magnet 23 .

As a specific embodiment, the third fixed magnet 31 , the third moving magnet 32 , the fourth moving magnet 33 and the fourth fixed magnet 34 are magnetized in the same direction along the horizontal Y axis.

As a specific implementation manner, the third stationary magnet 31 , the third moving magnet 32 , the fourth moving magnet 33 and the fourth stationary magnet 34 are all magnetized along the horizontal X-axis or Z-axis, and the third stationary magnet 31 is magnetized along the horizontal X-axis or Z-axis. The magnetization direction is the same as the magnetization direction of the fourth stationary magnet 34 and opposite to the magnetization directions of the third moving magnet 32 and the fourth moving magnet 33 .

As a specific embodiment, the overall structure of the horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction is axisymmetric, and the fixing hole is a square hole.

An embodiment of the present invention is given below with reference to FIGS. 1 to 4 .

Fig. 1 is a top view of a horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction, Fig. 2 is a three-dimensional model of Embodiment 1 of the horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction, the first The fixed magnet 21 is a 4mm×10mm×10mm cubic permanent magnet, the permanent magnet material is N44H grade NdFeB, the residual magnetic induction intensity Br=1.34T, and the relative magnetic permeability μ _r =1.03. The first fixed magnets 21 are arrayed at intervals of 8.5 mm, 27.5 mm and 36 mm along the positive direction of the X-axis to obtain the first moving magnets 22 , the second moving magnets 23 and the second fixed magnets 24 . The third fixed magnet 31 is a 10mm×4mm×10mm cubic permanent magnet, the permanent magnet material is N44H NdFeB, the residual magnetic induction intensity Br=1.34T, and the relative magnetic permeability μ _r =1.03. The third fixed magnet 31 is arrayed at intervals of 8.5 mm, 27.5 mm and 36 mm along the negative direction of the Y-axis to obtain the third moving magnet 32, the fourth moving magnet 33 and the fourth fixed magnet 34, the first moving magnet 22, the second moving magnet 34, The magnet 23 , the third moving magnet 32 and the fourth moving magnet 33 are respectively fixedly connected to the four outer walls of the moving magnet mounting frame 4 . The first fixed magnet 21 , the second fixed magnet 24 , the third fixed magnet 31 and the fourth fixed magnet 34 are respectively fixedly connected with the four inner walls of the fixed magnet holder 1; the size of the square hole at the top of the fixed magnet holder 1 is 40mm×40mm×16.5mm, and the material is hard aluminum alloy; the moving magnet installation frame 4 is 15mm×15mm× 12mm cube structure, the bottom end is opened with a round hole with a diameter of 10mm and a depth of 8mm to reduce the mass; the moving magnet mounting frame 4 is nested in the fixing hole at the top of the fixed magnet fixing frame 1 in a way that the axes overlap, and the bottom of the moving magnet mounting frame 4 is smaller than The top of the fixed magnet fixing frame 1 is 5mm high to ensure that the moving magnet installation frame 4 does not contact the fixed magnet fixing frame 1, so as to avoid the nonlinear effect of mechanical friction on the precision vibration isolation; the top of the moving magnet installation frame 4 is fixed with the load connector 5 The top end of the load connector 5 is connected to the vibration isolation load.

3 is a cross-sectional view of FIG. 1A-A, the first fixed magnet 21, the first moving magnet 22, the second moving magnet 23 and the second fixed magnet 24 are all magnetized along the positive direction of the X-axis, as shown by the arrows in FIG. 3; 4 is a cross-sectional view of FIG. 1B-B, the third stationary magnet 31, the third moving magnet 32, the fourth moving magnet 33 and the fourth stationary magnet 34 are magnetized along the negative direction of the Y-axis, as shown by the arrows in FIG. 4 . In the X direction, the negative stiffness generated by the X-direction magnetic spring 2 and the positive stiffness generated by the Y-direction magnetic spring 3 are connected in parallel to achieve low-frequency vibration isolation; in the Y direction, the positive stiffness generated by the X-direction magnetic spring 2 and the Y-direction magnetic spring 3 In the Z direction, the positive stiffness generated by the X-direction magnetic spring 2 is connected in parallel with the positive stiffness generated by the Y-direction magnetic spring 3 to stably support the vibration isolation load.

5 is the second embodiment of the cross-sectional view of FIG. 1A-A, the first fixed magnet 21 and the second fixed magnet 24 are magnetized along the negative Y-axis direction, and the first moving magnet 22 and the second moving magnet 23 are magnetized along the positive Y-axis direction.

6 is the third embodiment of the cross-sectional view of FIG. 1A-A, the first fixed magnet 21 and the second fixed magnet 24 are magnetized along the positive Z-axis direction, and the first moving magnet 22 and the second moving magnet 23 are magnetized along the negative Z-axis direction.

7 is the second embodiment of the cross-sectional view of FIG. 1B-B. The third stator 31 and the fourth stator 34 are magnetized along the negative X-axis direction, and the third moving magnet 32 and the fourth moving magnet 33 are magnetized along the positive X-axis direction.

8 is the third embodiment of the cross-sectional view of FIG. 1B-B. The third stator 31 and the fourth stator 34 are magnetized along the positive Z-axis direction, and the third moving magnet 32 and the fourth moving magnet 33 are magnetized along the negative Z-axis direction.

Claims

A horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction, comprising a connection structure and a magnetic circuit structure, wherein the connection structure comprises a fixed magnet fixing frame (1), a load connection piece (5) and a moving magnet installation Frame (4), the fixed magnet fixing frame (1) is a cube structure with fixing holes at the top, the moving magnet mounting frame (4) is a cube structure with holes at the bottom, and the top of the moving magnet mounting frame (4) is connected to the load connector (5). ) is fixedly connected to the bottom of the load connector (5), and the top of the load connector (5) is fixedly connected to the vibration isolation load; it is characterized in that: the magnetic circuit structure includes an X-direction magnetic spring (2) and a Y-direction magnetic spring (3), and the X-direction magnetic The spring (2) is vertically arranged with the Y-direction magnetic spring (3); the X-direction magnetic spring (2) comprises a first fixed magnet (21), a first moving magnet (22), a second moving magnet (22) and a second moving magnet (21) arranged in an array along the horizontal X-axis The magnet (23) and the second fixed magnet (24), the first fixed magnet (21), the first moving magnet (22), the second moving magnet (23) and the second fixed magnet (24) are cubic permanent magnets. There is an attractive force between the fixed magnet (21) and the first moving magnet (22), and there is an attractive force between the second moving magnet (23) and the second fixed magnet (24). The X-direction gap of a moving magnet (22) is equal to the X-direction gap between the second moving magnet (23) and the second stationary magnet (24); the Y-direction magnetic spring (3) includes third fixed magnets arranged in an array along the horizontal Y-axis in sequence. Magnet (31), third moving magnet (32), fourth moving magnet (33) and fourth stationary magnet (34), third stationary magnet (31), third moving magnet (32), fourth moving magnet ( 33) and the fourth stationary magnet (34) are cubic permanent magnets, the third stationary magnet (31) and the third moving magnet (32) act as gravitational forces, and the fourth moving magnet (33) and the fourth stationary magnet (34) ), the Y-direction gap between the third stationary magnet (31) and the third moving magnet (32) is equal to the Y-direction gap between the fourth moving magnet (33) and the fourth stationary magnet (34). The magnet (22), the second moving magnet (23), the third moving magnet (32) and the fourth moving magnet (33) are respectively fixedly connected to the four outer walls of the moving magnet mounting frame (4). The first fixed magnet (21) ), the second fixed magnet (24), the third fixed magnet (31) and the fourth fixed magnet (34) are respectively fixedly connected to the four inner walls of the fixed magnet fixing frame (1), and the moving magnet mounting frame (4) is connected with the axis It is nested in the fixing hole at the top of the fixed magnet fixing frame (1) in a overlapping manner, and a gap is provided between the bottom of the moving magnet installation frame (4) and the top of the fixed magnet fixing frame (1).
The horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction according to claim 1, characterized in that: the first fixed magnet (21), the first moving magnet (22), and the second moving magnet (23) and the second stationary magnet (24) are magnetized in the same direction along the horizontal X-axis.
The horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction according to claim 1, characterized in that: the first fixed magnet (21), the first moving magnet (22), and the second moving magnet (23) and the second stationary magnet (24) are both magnetized along the horizontal Y-axis or Z-axis, and the magnetization direction of the first stationary magnet (21) is the same as that of the second stationary magnet (24), which is the same as that of the first moving magnet. (22), the magnetization directions of the second moving magnet (23) are opposite.
The horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction according to claim 1, 2 or 3, characterized in that: the third fixed magnet (31), the third moving magnet (32), The fourth moving magnet (33) and the fourth stationary magnet (34) are magnetized in the same direction along the horizontal Y axis.
The horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction according to claim 1, 2 or 3, characterized in that: the third fixed magnet (31), the third moving magnet (32), Both the fourth moving magnet (33) and the fourth stationary magnet (34) are magnetized along the horizontal X-axis or Z-axis, and the magnetization direction of the third stationary magnet (31) is the same as that of the fourth stationary magnet (34), which is the same as that of the fourth stationary magnet (34). The magnetization directions of the third moving magnet (32) and the fourth moving magnet (33) are opposite.
The horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction according to claim 1, wherein the overall structure of the horizontal two-degree-of-freedom electromagnetic vibration isolation device based on the parallel connection of positive and negative stiffness of magnetic attraction is composed of: Axisymmetric, the fixing hole is a square hole.