Modularized ternary eddy current damper

Abstract

The utility model relates to a modularized ternary eddy current damper. The modularized ternary eddy current damper comprises a ball screw, a magnetic negative stiffness unit, an inerter unit, an eddy current damping unit, a connecting sleeve, a linear bearing and a ball nut, wherein the connecting sleeve is sleeved with the linear bearing and the ball nut. The ball screw is fixed in the axial direction; the magnetic negative stiffness unit, the inerter unit and the eddy current damping unit are sequentially arranged from top to bottom and are connected in a penetrating mode through a ball screw. And the ball nut and the connecting sleeve are relatively fixed. According to the modularized ternary eddy current damper, the flywheels in the inerter unit are arranged in a split mode, the mass and the radius of the flywheels and the number of the flywheels can be adjusted when needed, therefore, the inerter coefficient of the flywheels is adjusted, vibration of various strengths can be absorbed, and higher adaptability is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of dampers, in particular to a modular three-element eddy current damper. Background Art

[0002] A damper is a device used to slow down or control the vibration and movement of a mechanical system. It absorbs and consumes energy to reduce the vibration amplitude of the equipment, thereby reducing wear and noise.

[0003] Dampers generally include hydraulic dampers, gas dampers, spring dampers, active dampers, and semi-active dampers. These dampers generally have high trigger strengths and can only control and absorb relatively strong vibrations. Therefore, when the vibration intensity is low, the vibration will still be transmitted to the ground and nearby equipment, affecting nearby equipment. In addition, the specifications of all dampers are fixed and cannot be adjusted, so they are not very adaptable.

[0004] Therefore, a damper that can absorb vibrations of smaller intensity and adjust specifications is needed. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems and provide a modular three-element eddy current damper.

[0006] The technical solution of the utility model is: a modular three-element eddy current damper, comprising a ball screw, a magnetic negative stiffness unit, an inertia unit and an eddy current damping unit; the ball screw is fixed in its axial direction; the magnetic negative stiffness unit, the inertia unit and the eddy current damping unit are arranged in sequence up and down, and are connected by a ball screw;

[0007] The inertia unit includes a flywheel; the flywheel includes two semicircular flywheel plates and two connecting plates; a square notch is provided at the center of the flywheel plate; the two flywheel plates are fixed by the connecting plates; the flywheel plates are fixed by the connecting plates, which makes the flywheel plates easy to disassemble and replace and has greater adaptability.

[0008] The eddy current damper also includes a connecting sleeve, a linear bearing and a ball nut sleeved on the outside of the connecting sleeve, the ball nut being relatively fixed to the connecting sleeve; the connecting sleeve includes a pipe sleeve, the interior of which is provided with a cavity that cooperates with the ball screw; the bottom of the connecting sleeve is connected to the magnetic negative stiffness unit; the ball nut is threadedly engaged with the ball screw; the linear bearing is arranged on the top of the magnetic negative stiffness unit; a thrust bearing is arranged between the inertia unit and the eddy current damping unit, and the ball screw extends through the thrust bearing. The thrust bearing is used to limit the axial position of the ball screw and then cooperates with the ball nut. When the ball nut is subjected to axial force, the ball screw can rotate accordingly, converting the axial force into rotational motion of the ball screw.

[0009] Preferably, the magnetic negative stiffness unit includes a fixed magnetic steel plate armor and a movable magnetic steel plate; the bottom end of the connecting sleeve is fixed to the top center of the movable magnetic steel plate, and can transmit the axial vibration of the connecting sleeve to the movable magnetic steel plate; the ball nut is fixed to the bottom center of the movable magnetic steel plate, and the ball nut cooperates with the ball screw to convert the axial movement of the movable magnetic steel plate into the rotation of the ball screw; the fixed magnetic steel plate armor is annular, and two are arranged horizontally, and the two fixed magnetic steel plate armors are coaxially arranged relative to each other; a through hole is provided in the center of the movable magnetic steel plate, and is horizontally arranged between the two fixed magnetic steel plate armors; an even number of permanent magnets are also fixed on the fixed magnetic steel plate armor, and the permanent magnets are arranged on the same side and with the fixed magnetic steel plate armor. The axis of the steel plate armor is distributed circumferentially; the permanent magnets on the two fixed magnetic steel plate armors correspond one to one; a number of permanent magnets are fixed on the upper and lower sides of the movable magnetic steel plate, and the permanent magnets are distributed circumferentially around the axis of the movable magnetic steel plate; the permanent magnets on both sides of the movable magnetic steel plate correspond one to one; the permanent magnets arranged on the upper fixed magnetic steel plate armor correspond one to one with the permanent magnets on the upper side of the movable magnetic steel plate, and the polarities of the opposite surfaces are opposite; the permanent magnets arranged on the lower fixed magnetic steel plate armor correspond one to one with the permanent magnets on the lower side of the movable magnetic steel plate, and the polarities of the opposite surfaces are opposite; the permanent magnets of opposite polarities can provide suction when the movable magnetic steel plate vibrates up and down, and can more efficiently absorb and dissipate external input vibration energy in conjunction with the eddy current damping unit, thereby enhancing the vibration resistance of the structure.

[0010] The eddy current damping unit includes a fixed magnetic steel plate B and a conductive copper plate; the fixed magnetic steel plate B is consistent with the fixed magnetic steel plate A in shape and size; two fixed magnetic steel plates B are arranged horizontally, and the two fixed magnetic steel plates B are coaxially arranged opposite to each other; a square through hole is provided in the center of the conductive copper plate and is horizontally arranged between the two fixed magnetic steel plates B; an even number of permanent magnets are also fixed on the fixed magnetic steel plate B, and the permanent magnets are arranged on the same side and distributed around the axis of the fixed magnetic steel plate B; the permanent magnets on the two fixed magnetic steel plates B correspond one to one and the polarities of the opposite surfaces are opposite; the adjacent permanent magnets on the same fixed magnetic steel plate in the eddy current damping unit have opposite polarities; when the conductive copper plate cuts the magnetic lines of force at a certain speed, eddy currents will be generated inside the conductive copper plate; due to the resistance of the conductive copper plate, according to Ohm's law, the eddy currents will be dissipated through heat conduction in the form of heat energy. According to Lenz's law "what comes is rejected and what goes is stayed", the opposing magnetic field generated by the eddy current will interact with the original magnetic field, generating a Lorentz force in the opposite direction of the movement of the conductive copper plate, namely the eddy current damping force, which will eventually convert the kinetic energy of the conductive copper plate into heat energy for dissipation, thereby achieving the purpose of dissipating structural vibration energy.

[0011] The position where the ball screw and the inertia unit correspond is square shaft segment A. The shape of the square notch in the center of the flywheel matches the outline of square shaft segment A. This prevents the flywheel from slipping against the ball screw during rotation, which could reduce the flywheel's kinetic energy storage rate and thus the device's vibration reduction effectiveness. The position where the ball screw and the eddy current damping unit correspond is square shaft segment B. The shape of the square through-hole in the center of the conductive copper plate matches the outline of square shaft segment B. This prevents the conductive copper plate from slipping relative to the ball screw during rotation, which could reduce the eddy current damping unit's ability to dissipate kinetic energy and thus reduce the device's vibration reduction effectiveness.

[0012] Furthermore, the polarities of adjacent permanent magnets fixed on the same side in the magneto-induced negative stiffness unit and the eddy current damping unit are opposite. In the arrangement of adjacent opposite polarities, the direction of the magnetic field constantly alternates between different magnetic poles. This change can cause the magnetic field to remain relatively stable during the rotational movement of the conductor copper plate, and it is not easy for the magnetic field to deviate or leak. This is of great help to the reliability and consistency of the damping system, ensuring that the system can provide continuous damping force during the entire operation process. Compared with the arrangement of adjacent identical polarities, the magnetic field strength in the eddy current damping unit can be significantly enhanced, while the generation and distribution of eddy currents are enhanced, thereby improving the damping effect and system stability. This makes the design with opposite polarities more suitable for applications requiring high efficiency and strong damping.

[0013] Furthermore, the conductor copper plate is fixed to the ball screw via a flange fixing seat. The flange fixing seat is connected to the conductor copper plate via bolts, which can fix the conductor copper plate to the ball screw and prevent the conductor copper plate from falling.

[0014] Furthermore, the eddy current damper further comprises columns; the columns are divided into three groups, and each group of columns is distributed circumferentially around the axis of the ball screw;

[0015] The two fixed magnetic steel plates A are fixed together by a first set of columns; the two magnetic steel plates B are fixed together by a third set of columns; and the magnetic negative stiffness unit and the eddy current damping unit are fixed together by a second set of columns. By securing each component with columns, each unit is connected as a whole, enhancing the stability of the structure.

[0016] Preferably, the eddy current damper is further provided with a frame circular plate, which includes a top circular plate, a middle circular plate, and a bottom circular plate; a linear bearing is fixed to the center of the upper top surface of the top circular plate, and a circular hole is provided in the center of the top circular plate, through which a connecting sleeve passes; the thrust bearing and the eddy current damping unit are separated by the middle circular plate, and the thrust bearing passes through and is fixed to the middle circular plate, and the middle circular plate and the bottom circular plate are respectively connected to the other side of the two fixed magnetic steel plates B equipped with permanent magnets. The top circular plate fixes the linear bearing, and the middle circular plate is fixed above the fixed magnetic steel plate B, which can block the magnetic force of the negative stiffness unit and the eddy current damping unit, reducing the magnetic interference between the two units.

[0017] Preferably, the flywheel plates are provided with four pieces, which are combined in pairs to form a complete flywheel. The flywheel plates are combined in pairs and fixed by connecting plates and bolts, so that the mass and radius of the flywheel and the number of flywheels can be adjusted according to needs, which has higher adaptability.

[0018] Preferably, a connecting bolt is provided at the top end of the connecting sleeve, which is connected to the device via the connecting bolt to avoid the damper and the device being disconnected due to vibration, thereby affecting the vibration reduction effect.

[0019] Furthermore, the flange fixing seat is arranged below the conductor copper plate, is sleeved on the lower part of the ball screw, and is fixed with a jackscrew; the flange fixing seat is fixed to the conductor copper plate by two bolts, which can fix the conductor copper plate and prevent it from falling.

[0020] Preferably, the ball screw passes through a thrust bearing, the upper end of which contacts the circular step of the ball screw, and the lower end of which is secured to the ball screw and the thrust bearing by a jackscrew. The thrust bearing limits the position of the ball screw and is secured by the jackscrew, thereby preventing axial displacement of the ball screw during relative rotation between the ball screw and the ball, which could affect the normal operation of the device.

[0021] The beneficial effects of the present invention are as follows: the modular three-element eddy current damper of the present invention has the following advantages:

[0022] 1. The axially transmitted vibration is converted into the kinetic energy of the flywheel and stored, and then the kinetic energy in the flywheel is consumed by the eddy current damping unit, so that the response of the device is extremely fast and the triggered vibration intensity is low, which can offset small vibrations.

[0023] 2. The flywheel in the device adopts a split setting, which can adjust the mass and radius of the flywheel and the number of flywheels when needed, thereby adjusting the inertia coefficient of the flywheel, and can absorb vibrations of various intensities, with higher adaptability.

[0024] 3. The flywheel and the conductor copper plate cooperate with the ball screw through the square hole, which avoids the slippage of the ball screw during rotation and makes the device more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the modular three-element eddy current damper of the utility model. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the structure of the modular three-element eddy current damper of the utility model. Figure 2 ;

[0027] Figure 3 This is the main view of the modular three-element eddy current damper of the utility model;

[0028] Figure 4 yes Figure 3 AA section view;

[0029] Figure 5 It is a structural diagram of the ball screw;

[0030] Figure 6 This is the structural diagram of the magnetic negative stiffness unit. Figure 1 ;

[0031] Figure 7 This is the structural diagram of the magnetic negative stiffness unit. Figure 2 (equipped with ball screw, ball nut and linear bearing);

[0032] Figure 8 This is a top view of the magnetic negative stiffness unit (with linear bearings installed and the upper fixed magnetic steel plate and frame circular plate removed);

[0033] Figure 9 It is a structural diagram of the inertia unit;

[0034] Figure 10 It is a schematic diagram of the structure of the flywheel;

[0035] Figure 11 It is a structural diagram of the eddy current damping unit;

[0036] Figure 12 It is a structural diagram of the cooperation between the conductor copper plate and the ball screw;

[0037] Figure 13 yes Figure 12 Bottom view of the (excluding flange fixing seat);

[0038] In the figure: 01. Ball screw, 011. Square shaft segment A, 012. Square shaft segment B, 02. Connecting sleeve, 03. Linear bearing, 04. Ball nut, 05. Thrust bearing, 061. Top circular plate, 062. Middle circular plate, 063. Bottom circular plate, 07. Column,

[0039] 1. Magneto-induced negative stiffness unit, 11. Fixed magnetic steel plate A, 12. Movable magnetic steel plate, 2. Flywheel, 21. Flywheel plate, 22. Connecting plate, 3. Eddy current damping unit, 31. Fixed magnetic steel plate B, 32. Conductor copper plate, 33. Flange fixing seat, 4. Permanent magnet.

[0040] "N" and "S" in the figure represent the magnetic poles of the permanent magnets. DETAILED DESCRIPTION

[0041] Example 1: See Figure 1-13 A modular three-element eddy current damper includes a ball screw 01, a magnetic negative stiffness unit 1, an inertia unit, and an eddy current damping unit 3; the ball screw 01 is fixed in its axial direction; the magnetic negative stiffness unit 1, the inertia unit, and the eddy current damping unit 3 are arranged in sequence up and down, and are connected by the ball screw 01;

[0042] The inertia unit includes a flywheel 2; the flywheel 2 includes two semicircular flywheel plates 21 and two connecting plates 22; a square notch is provided at the center of the flywheel plate 21; the two flywheel plates 21 are fixed by the connecting plates 22; the flywheel plates 21 are fixed by the connecting plates 22, which makes it easy to disassemble and replace the flywheel plates 21 and has greater adaptability.

[0043] A bearing is fixedly provided at the bottom of the eddy current damping unit 3 and matches the lower end of the ball screw 01. Matching the bearing with the ball screw 01 can improve the stability of the ball screw 01 during rotation and improve the stability of the device during operation.

[0044] The eddy current damper also includes a connecting sleeve 02, a linear bearing 03 sleeved on the outside of the connecting sleeve 02, and a ball nut 04, with the ball nut 04 fixed relative to the connecting sleeve 02. The connecting sleeve 02 includes a sleeve with a cavity inside that cooperates with the ball screw 01. The bottom of the connecting sleeve 02 is connected to the magnetic negative stiffness unit 1. The ball nut 04 is threadedly engaged with the ball screw 01. The linear bearing 03 is arranged on the top of the magnetic negative stiffness unit 1. A thrust bearing 05 is provided between the inertia unit and the eddy current damping unit 3, and the ball screw 01 extends through the thrust bearing 05. The thrust bearing 05 is used to limit the axial position of the ball screw 01 and then cooperates with the ball nut 04. When the ball nut 04 is subjected to an axial force, the ball screw 01 can rotate accordingly, converting the axial force into rotational motion of the ball screw 01.

[0045] The magnetic negative stiffness unit 1 includes a fixed magnetic steel plate armor 11 and a movable magnetic steel plate 12; the bottom end of the connecting sleeve is fixed to the top center of the movable magnetic steel plate 12, and can transmit the axial vibration of the connecting sleeve to the movable magnetic steel plate 12; the ball nut 04 is fixed to the bottom center of the movable magnetic steel plate 12, and the ball nut 04 cooperates with the ball screw 01 to convert the axial movement of the movable magnetic steel plate 12 into the rotation of the ball screw 01; the fixed magnetic steel plate armor 11 is annular, and two are arranged horizontally, and the two fixed magnetic steel plate armors 11 are coaxially arranged opposite to each other; a through hole is provided in the center of the movable magnetic steel plate 12, and is horizontally arranged between the two fixed magnetic steel plate armors 11; an even number of permanent magnets 4 are also fixed on the fixed magnetic steel plate armor 11, and the permanent magnets 4 are arranged on the same side and with the fixed magnetic steel plate The axis of A 11 is distributed circumferentially; the permanent magnets 4 on the two fixed magnetic steel plates A 11 correspond one to one; a number of permanent magnets 4 are fixed on the upper and lower sides of the movable magnetic steel plate 12, and the permanent magnets 4 are distributed circumferentially around the axis of the movable magnetic steel plate 12; the permanent magnets 4 on both sides of the movable magnetic steel plate 12 correspond one to one; the permanent magnets 4 arranged on the upper fixed magnetic steel plate A 11 correspond one to one with the permanent magnets 4 on the upper side of the movable magnetic steel plate 12, and the polarities of the opposite surfaces are opposite; the permanent magnets 4 arranged on the lower fixed magnetic steel plate A 11 correspond one to one with the permanent magnets 4 on the lower side of the movable magnetic steel plate 12, and the polarities of the opposite surfaces are opposite; the permanent magnets 4 of opposite polarities can provide suction when the movable magnetic steel plate 12 vibrates up and down, and cooperate with the eddy current damping unit 3 to more efficiently absorb and dissipate the vibration energy input from the outside, thereby enhancing the vibration resistance of the structure.

[0046] The eddy current damping unit 3 includes a fixed magnetic steel plate B 31 and a conductive copper plate 32; the fixed magnetic steel plate B 31 is consistent in shape and size with the fixed magnetic steel plate A 11; two fixed magnetic steel plates B 31 are arranged horizontally, and the two fixed magnetic steel plates B 31 are arranged coaxially opposite to each other; a square through hole is provided in the center of the conductive copper plate 32 and is horizontally arranged between the two fixed magnetic steel plates B 31; an even number of permanent magnets 4 are also fixed on the fixed magnetic steel plate B 31, and the permanent magnets 4 are arranged on the same side and distributed circumferentially around the axis of the fixed magnetic steel plate B 31; the permanent magnets 4 on the two fixed magnetic steel plates B 31 correspond one to one and the polarities of the opposite surfaces are opposite; adjacent permanent magnets 4 on the same fixed magnetic steel plate in the eddy current damping unit 3 have opposite polarities; when the conductive copper plate 32 cuts the magnetic lines of force at a certain speed, eddy currents are generated inside the conductive copper plate 32; due to the resistance of the conductive copper plate 32, according to Ohm's law, the eddy currents will be dissipated through heat conduction in the form of heat energy. According to Lenz's law "what comes is rejected, what goes is retained", the opposing magnetic field generated by the eddy current will interact with the original magnetic field, generating a Lorentz force opposite to the direction of movement of the conductive copper plate 32, namely the eddy current damping force, which will eventually convert the kinetic energy of the conductive copper plate 32 into heat energy for dissipation, thereby achieving the purpose of dissipating structural vibration energy.

[0047] The position between ball screw 01 and the inertia unit is square shaft segment A 011. The shape of the square notch in the center of flywheel 2 matches the outline of square shaft segment A 011. This prevents the flywheel 2 from slipping relative to ball screw 01 during rotation, which could reduce the flywheel 2's kinetic energy storage rate and thus the device's vibration reduction effectiveness. The position between ball screw 01 and eddy current damping unit 3 is square shaft segment B 012. The shape of the square through-hole in the center of conductive copper plate 32 matches the outline of square shaft segment B 012. This prevents the conductive copper plate 32 from slipping relative to ball screw 01 during rotation, which could reduce the eddy current damping unit 3's ability to dissipate kinetic energy and thus reduce the device's vibration reduction effectiveness.

[0048] The adjacent permanent magnets 4 fixed on the same side in the magneto-induced negative stiffness unit 1 and the eddy current damping unit 3 have opposite polarities. In the arrangement of adjacent opposite polarities, the direction of the magnetic field constantly alternates between different magnetic poles. This change can cause the magnetic field to remain relatively stable during the rotation of the conductor copper plate 32, and it is not easy for the magnetic field to deviate or leak. This is of great help to the reliability and consistency of the damping system, ensuring that the system can provide continuous damping force during the entire operation process. Compared with the arrangement of adjacent identical polarities, the magnetic field strength in the eddy current damping unit 3 can be significantly enhanced, while the generation and distribution of eddy currents are enhanced, thereby improving the damping effect and system stability. This makes the design with opposite polarities more suitable for applications requiring high efficiency and strong damping.

[0049] The conductor copper plate 32 is fixed to the ball screw 01 via a flange fixing seat 33. The flange fixing seat 33 is connected to the conductor copper plate 32 via bolts, which can fix the conductor copper plate 32 to the ball screw 01 and prevent the conductor copper plate 32 from falling.

[0050] The eddy current damper further comprises columns 07; the columns 07 are divided into three groups, and each group of columns 07 is distributed around the axis of the ball screw 01;

[0051] The two fixed magnetic steel plates A 11 are fixed together by a first set of columns 07; the two magnetic steel plates B are fixed together by a third set of columns 07; and the magnetic negative stiffness unit 1 and the eddy current damping unit 3 are fixed together by a second set of columns 07. Fixing each component with columns 07 ensures that each unit is connected as a whole, enhancing the stability of the structure.

[0052] The eddy current damper is also provided with a frame circular plate, which includes a top circular plate 061, a middle circular plate 062, and a bottom circular plate 063. The linear bearing 03 is fixed to the center of the upper top surface of the top circular plate 061. The center of the top circular plate 061 is provided with a circular hole, through which the connecting sleeve 02 passes. The thrust bearing 05 is separated from the eddy current damping unit 3 by the middle circular plate 062, and the thrust bearing 05 passes through and is fixed to the middle circular plate 062. The middle circular plate 062 and the bottom circular plate 063 are respectively connected to the other side of the two fixed magnetic steel plates B 31 equipped with permanent magnets 4. The top circular plate 061 fixes the linear bearing 03; the middle circular plate 062 is fixed above the fixed magnetic steel plate B 31, and can block the magnetic force of the negative stiffness unit and the eddy current damping unit 3, reducing the magnetic interference between the two units.

[0053] A bearing groove is provided in the middle of the bottom circular plate 063, and the bearing at the bottom of the eddy current damping unit 3 is installed in the bearing groove.

[0054] The flywheel plates 21 are provided with four pieces, which are combined in pairs to form a complete flywheel 2. The flywheel plates 21 are combined in pairs and fixed by connecting plates 22 and bolts. The mass and radius of the flywheel 2 and the number of flywheels 2 can be adjusted according to needs, which has higher adaptability.

[0055] The top of the connecting sleeve 02 is provided with a connecting bolt. Connecting the connecting bolt to the equipment prevents the damper from being disconnected from the equipment due to vibration, which affects the vibration reduction effect.

[0056] The flange fixing seat 33 is set below the conductor copper plate 32, and the flange fixing seat 33 is sleeved on the lower part of the ball screw 01 and fixed with a jackscrew; the flange fixing seat 33 is fixed to the conductor copper plate 32 by two bolts. The conductor copper plate 32 can be fixed to prevent it from falling.

[0057] Ball screw 01 passes through thrust bearing 05. The upper end of thrust bearing 05 contacts the circular step of ball screw 01, and the lower end is fixed to ball screw 01 and thrust bearing 05 via a jackscrew. Thrust bearing 05 limits the position of ball screw 01 and is fixed by the jackscrew, preventing axial displacement of ball screw 01 during relative rotation between ball screw 01 and ball bearing, which could affect the normal operation of the device.

[0058] The working principle of this embodiment is as follows:

[0059] The device is connected to the bottom of the device via the connecting bolts at the top of the connecting sleeve 02. When the device is started, the vertical vibrations generated by the device are transmitted to the damper. The connecting sleeve 02 vibrates axially, driving the movable magnetic steel plate 12 to vibrate up and down. During this process, the permanent magnets 4 on the two fixed magnetic steel plates 11 exert an attractive force on the permanent magnets 4 on the movable magnetic steel plate 12, exhibiting a negative stiffness effect. As the movable magnetic steel plate 12 vibrates up and down, the ball nut 04 converts the axial motion into rotational motion of the ball screw 01. The rotation of the ball screw 01 drives the rotation of the conductive copper plate 32. The conductive copper plate 32 rotates in the magnetic field, generating eddy currents within the conductive copper plate 32 as it cuts through the magnetic flux lines at a certain speed. Due to the resistance of the conductive copper plate 32, according to Ohm's law, the eddy currents are dissipated as heat energy through heat conduction. According to Lenz's law "what comes is rejected and what goes is stayed", the opposing magnetic field generated by the eddy current will interact with the original magnetic field, generating a Lorentz force in the opposite direction of the movement of the conductive copper plate 32, namely the eddy current damping force, which ultimately converts the kinetic energy of the conductive copper plate 32 into heat energy for dissipation; in addition, the rotational inertia moment generated by the high-speed rotation of the rotating components such as the flywheel 2 and the conductive copper plate 32 driven by the ball screw 01 and the eddy current damping torque generated by the conductive copper plate 32 cutting the four groups of magnetic flux lines of the permanent magnet are further amplified by the ball screw 01 transmission system to form the axial inertia force and eddy current damping force respectively.

[0060] Example 2: Example 2 is basically the same as Example 1, and the similarities are not repeated here. The difference is that the permanent magnet 4 in the magnetic negative stiffness unit 1 and the eddy current damping unit 3 is detachably connected to the fixed magnetic steel plate; the magnetic field strength in the magnetic negative stiffness unit 1 and the eddy current damping unit 3 can be adjusted according to the overall amplitude of the equipment, thereby adjusting the vibration absorption performance of the damper.

Claims

1. A modular three-element eddy current damper, characterized by: It includes a ball screw, a magnetic negative stiffness unit, an inertia unit and an eddy current damping unit; the ball screw is fixed in its axial direction; the magnetic negative stiffness unit, the inertia unit and the eddy current damping unit are arranged in sequence up and down, and are connected by the ball screw; The inertia unit includes a flywheel; the flywheel includes two semicircular flywheel plates and two connecting plates; a square notch is provided at the center of the flywheel plate; the two flywheel plates are fixed by the connecting plate; The eddy current damper also includes a connecting sleeve, a linear bearing and a ball nut sleeved on the outside of the connecting sleeve, and the ball nut is relatively fixed to the connecting sleeve; the connecting sleeve includes a pipe sleeve, and a cavity is provided inside the pipe sleeve to cooperate with the ball screw; the bottom of the connecting sleeve is connected to the magnetic negative stiffness unit; the ball nut is threaded with the ball screw; the linear bearing is arranged at the top of the magnetic negative stiffness unit; a thrust bearing is provided between the inertia unit and the eddy current damping unit, and the ball screw passes through the thrust bearing.

2. The modular three-element eddy current damper according to claim 1, characterized in that: The magnetic negative stiffness unit includes a fixed magnetic steel plate armor and a movable magnetic steel plate; the bottom end of the connecting pipe sleeve is fixed to the top center of the movable magnetic steel plate, and the ball nut is fixed to the bottom center of the movable magnetic steel plate; the fixed magnetic steel plate armor is annular and is horizontally arranged with two, and the two fixed magnetic steel plates are coaxially arranged relative to each other; a through hole is provided in the center of the movable magnetic steel plate and is horizontally arranged between the two fixed magnetic steel plates; an even number of permanent magnets are also fixed on the fixed magnetic steel plate armor, and the permanent magnets are arranged on the same side and are connected with the fixed magnetic steel plate armor. The axis of the plate armor is circumferentially distributed; the permanent magnets on the two fixed magnetic steel plates correspond one to one; a number of permanent magnets are fixed on both the upper and lower sides of the movable magnetic steel plate, and the permanent magnets are distributed circumferentially around the axis of the movable magnetic steel plate; the permanent magnets on both sides of the movable magnetic steel plate correspond one to one; the permanent magnets set on the upper fixed magnetic steel plate correspond one to one with the permanent magnets on the upper side of the movable magnetic steel plate, and the polarities of the opposing surfaces are opposite; the permanent magnets set on the lower fixed magnetic steel plate correspond one to one with the permanent magnets on the lower side of the movable magnetic steel plate, and the polarities of the opposing surfaces are opposite; The eddy current damping unit includes a fixed magnetic steel plate B and a conductive copper plate; the fixed magnetic steel plate B is consistent in shape and size with the fixed magnetic steel plate A; two fixed magnetic steel plates B are arranged horizontally, and the two fixed magnetic steel plates B are arranged coaxially opposite to each other; a square through hole is provided in the center of the conductive copper plate and is arranged horizontally between the two fixed magnetic steel plates B; an even number of permanent magnets are also fixed to the fixed magnetic steel plate B, the permanent magnets are arranged on the same side and are distributed circumferentially around the axis of the fixed magnetic steel plate B; the permanent magnets on the two fixed magnetic steel plates B correspond to each other one by one and the polarities of the opposing surfaces are opposite; The position corresponding to the ball screw and the inertia unit is square shaft segment A, and the shape of the square notch in the center of the flywheel matches the outline of square shaft segment A; the position corresponding to the ball screw and the eddy current damping unit is square shaft segment B, and the shape of the square through hole in the middle of the conductor copper plate matches the outline of square shaft segment B.

3. The modular three-element eddy current damper according to claim 2, characterized in that: The adjacent permanent magnets fixed on the same side in the magnetic negative stiffness unit and the eddy current damping unit have opposite polarities.

4. The modular three-element eddy current damper according to claim 2, characterized in that: The conductor copper plate is fixed to the ball screw via a flange fixing seat.

5. The modular three-element eddy current damper according to claim 2, characterized in that: The eddy current damper also includes columns; the columns are divided into three groups, and each group of columns is distributed around the axis of the ball screw; The two fixed magnetic steel plates A are fixed by a first set of columns; the two magnetic steel plates B are fixed by a third set of columns; and the magnetic negative stiffness unit and the eddy current damping unit are fixed by a second set of columns.

6. The modular three-element eddy current damper according to claim 1, characterized in that: The eddy current damper is also provided with a frame circular plate, which includes a top circular plate, a middle circular plate and a bottom circular plate; the linear bearing is fixed at the center of the upper top surface of the top circular plate, and a circular hole is provided at the center of the top circular plate, through which the connecting sleeve passes; the thrust bearing and the eddy current damping unit are separated by the middle circular plate, and the thrust bearing passes through and is fixed on the middle circular plate, and the middle circular plate and the bottom circular plate are respectively connected to the other side of the two fixed magnetic steel plates B equipped with permanent magnets.

7. The modular three-element eddy current damper according to claim 1, characterized in that: The flywheel plates are provided with four pieces, which are combined in pairs to form a complete flywheel.

8. The modular three-element eddy current damper according to claim 1, characterized in that: A connecting bolt is provided on the top end of the connecting sleeve.

9. The modular three-element eddy current damper according to claim 4, characterized in that: The flange fixing seat is arranged below the conductor copper plate, is sleeved on the lower part of the ball screw, and is fixed with a top screw; the flange fixing seat is fixed to the conductor copper plate by two bolts.

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