Variable air gap high linearity electromagnetic active vibration absorber

Abstract

The present invention provides a variable air gap high linearity electromagnetic active vibration absorber, comprising a mover assembly, a stator assembly and a base plate, wherein the mover assembly is located outside the stator assembly, the stator assembly is fixed on the base plate, an elastic body is provided between the base plate and the mover assembly, and an air gap is provided between the stator assembly and the mover assembly. The present invention has a simple structure, good performance, and high reliability, and solves the problem of nonlinear displacement of the mover output and reduced output force of the vibration absorber. The magnets and copper coils are all concentrated on the mover, so that the mass of the vibration absorber can be more concentrated on the mover, thereby reducing the displacement of the mover when the vibration absorber reaches the same output, and at the same time improving the volume utilization efficiency of the vibration absorber, and the output requirement can be achieved without reserving a large movement space for the mover.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration absorbers, and in particular to a variable air gap high linearity electromagnetic active vibration absorber. Background Art

[0002] In many industrial fields, mechanical vibration is an engineering problem that cannot be ignored. For example, the eccentric mass of the rotating mechanism in rotating machinery such as internal combustion engines and oil pumps causes vibration, which generates environmental noise, reduces the life of parts, and affects the normal operation of precision instruments or sensors; the creep phenomenon caused by friction in the linear motion mechanism of machine tools or the structural vibration caused by unbalanced cutting force on the spindle affects the machining accuracy of machine tools; for example, the vibration of the roadbed caused by the passing of trains in rail transportation may damage the surrounding building structures and affect the surrounding residents; the mechanical vibration on military ships will be transmitted to the ship's hull, generating sound radiation, affecting the concealment of military ships. Therefore, vibration control is particularly important in these applications.

[0003] Vibration absorbers are widely used as a common vibration control method, and active vibration absorbers, as the ultimate form of vibration absorbers, can suppress vibration to the greatest extent. Passive vibration absorbers are mainly composed of a spring-damper-oscillator system. Electromagnetic active vibration absorbers add coils and permanent magnets (or only coils) to passive vibration absorbers. By energizing the coil, electromagnetic force is applied to the oscillator, thereby generating active force to offset the vibration force and suppress vibration. An ideal electromagnetic active vibration absorber has two important characteristics: (1) good output linearity; (2) high output density per unit volume. Both theory and practice show that the better the output linearity, the better the active vibration control effect; the greater the output density per unit volume means that the active vibration absorber occupies less space and has more flexible requirements on installation space and installation methods.

[0004] The traditional active electromagnetic vibration absorber generates electromagnetic force mainly in the following ways: (1) Ampere force type vibration absorber: Most of the wires of this type of vibration absorber are circumferentially wound, and the energized wires generate Ampere force under the action of the radial magnetic field. For this type of vibration absorber, the coil needs to be placed in the air gap, and the coil is energized to generate Ampere force in the air gap magnetic field, such as Chinese invention patents CN107339352A, CN103573908A, etc.; (2) Electromagnetic vibration absorber: The energized wires surrounding the iron core are energized to turn the iron core into an electromagnet, and the electromagnet and the mover attract or repel to generate electromagnetic force, such as Chinese invention patents CN106641087A, CN108916301A, CN201621103913.7, etc. Among them, the output volume density of the electromagnetic vibration absorber is greater than that of the Ampere force type vibration absorber, but generally speaking, its output linearity is worse than that of the Ampere force type vibration absorber. The output nonlinearity of electromagnetic vibration absorbers includes two forms: (1) displacement nonlinearity: the output of the vibration absorber is greatly affected by the displacement of the mover. At a certain working frequency, the output of an ideal electromagnetic vibration absorber should only be related to the coil current, and the output is proportional to the current (F=K·I). However, even when the electromagnetic vibration absorber is not powered on, due to the influence of the electromagnetic force between the permanent magnet and the magnetizer between the mover and the stator, the actuator output is often related to the displacement of the mover, resulting in nonlinear enhancement (the closer the magnetizer is to the permanent magnet, the greater the suction force, and vice versa. In short, the interaction force between the magnetizer and the permanent magnet is related to the positional relationship between the two); (2) current nonlinearity: the output of the vibration absorber will gradually saturate as the current increases (the unit current output decreases as the current increases). This is due to the magnetic saturation characteristics of the magnetizer. Among them, displacement nonlinearity has the greatest impact. As one of the core components of active vibration control, the nonlinearity of the active vibration absorber seriously affects the effect of active vibration control. Therefore, improving the linearity of the active vibration absorber makes an important contribution to improving the effect of active vibration control.

[0005] Chinese patent document CN201621103913.7 records a magnetic resistance type electromagnetic active vibration absorber, which generates alternating "N" poles or "S" poles by passing alternating current through the coil, thereby generating alternating electromagnetic force, but this structure has the following disadvantages: 1. The coil is wound on the stator, so that the mass is more concentrated on the stator, reducing the volume efficiency of the vibration absorber. 2. When the coil is not energized, the mover is still affected by the electromagnetic force between the induced magnetic field of the permanent magnet and the stator protrusion in the vertical direction, that is, when the "displacement nonlinearity" mentioned above produces an upward displacement, the induced magnetic field of the permanent magnet of the mover produces an attractive force on the stator protrusion, and its vertical component is downward and changes with the displacement. This force will cause serious interference to the output linearity when the vibration absorber is working. 3. The structure uses a large amount of magnets, which leads to increased costs and difficulty in assembly. When assembling, the magnet will generate a strong magnetic attraction with the magnetizer, which makes assembly difficult. Therefore, generally speaking, the more magnetic steel is used, the more difficult it is to assemble.

[0006] Chinese patent document CN201720827826.4 records an electromagnetic active vibration absorber, which also generates alternating "N" poles or "S" poles by passing alternating current through a coil, thereby generating alternating electromagnetic force. This structure also has the problems of low volume efficiency, nonlinear displacement change, and difficult assembly.

[0007] Chinese patent document CN201922485495.2 records a composite electromagnetic dynamic vibration absorber, which realizes the joint action of electromagnetic force and Ampere force through magnetic circuit design, but the structure has the following limitations: 1. Although the scheme is a combination of two vibration absorber magnetic circuit structures, it does not completely eliminate the "displacement nonlinearity" of the vibration absorber. The air gap thickness remains unchanged while the length changes, and the total magnetic resistance still changes with the displacement of the mover. Therefore, the magnetic attraction between the stator and the mover still changes with the displacement of the mover. Therefore, the "displacement nonlinearity" problem is not fundamentally solved; 2. The coil space of the magnetic circuit structure is limited, and the output efficiency per unit volume is not as good as that of a simple electromagnetic vibration absorber.

[0008] Chinese patent document CN201610312370.8 records a high linearity electromagnetic semi-active vibration absorber, which uses several staggered tooth structures at the air gap between the mover and the stator. This structure can make the air gap magnetic resistance between different tooth shapes compensate each other during the movement of the mover, so that the total magnetic resistance of the air gap hardly changes with the movement of the mover, so that the vibration absorber has extremely high displacement linearity. However, since the entire vibration absorber does not use permanent magnets in pursuit of linearity, the magnetic flux of the vibration absorber magnetic circuit is extremely low compared with the magnetic circuit of the electromagnetic vibration absorber with the same volume and permanent magnets, which further leads to low magnetic energy of the magnetic circuit and low output per unit volume. Its practical application range is greatly limited. Summary of the invention

[0009] The main purpose of the present invention is to provide a variable air gap high linearity electromagnetic active vibration absorber to solve the problem of nonlinear displacement of the mover output and reduced output force of the vibration absorber.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: including a mover assembly, a stator assembly and a base plate, the mover assembly is located outside the stator assembly, the stator assembly is fixed on the base plate, an elastic member is provided between the base plate and the mover assembly, and an air gap is provided between the stator assembly and the mover assembly; preferably, a shell is also provided, the shell is detachably connected to a top plate, the shell is located above the base plate, and the top plate is located above the shell.

[0011] In a preferred embodiment, the stator assembly includes a stator block, on which a plurality of protrusions are evenly arranged, the protrusions including an upper end protrusion and a lower end protrusion, and the stator block is respectively connected to the top plate and the bottom plate through a mounting seat.

[0012] In a preferred embodiment, the movable subassembly includes two first magnets arranged in parallel, a magnetic part is provided between the two first magnets, the magnetic part includes a first magnet and a second magnet arranged in parallel, a second magnet is provided between the first magnet and the second magnet, a coil is provided in the middle of the second magnet, and the polarities of the first magnet and the second magnet are arranged oppositely; preferably, a coil frame is provided outside the coil, and the coil frame is located inside the second magnet.

[0013] In a preferred embodiment, the second magnetizer includes a side plate, two baffles are relatively arranged on the side plates, and air gap surfaces for separating the mover assembly and the stator assembly are symmetrically arranged on both sides of the stator assembly, the baffle is close to the second side wall of the stator assembly and is inclined toward the magnetic component that is closer, the first side wall of the first magnetizer is close to the stator assembly and is inclined toward the magnetic component that is closer, the third side wall of the magnetic component is parallel to the air gap surface, and the vertical distance between the third side wall and the air gap surface is respectively greater than the distance between one end of the first side wall close to the magnetic component and the stator assembly and the distance between one end of the second side wall close to the magnetic component and the stator assembly.

[0014] In the preferred embodiment, a counterweight block is provided on the outside of the movable subassembly, and a plurality of spring holes and a plurality of bearing holes are relatively provided on the counterweight block. The elastic member is passed through the spring hole, and the upper end of the elastic member is connected to the counterweight block by a screw. A bearing sleeve is provided in the bearing hole, and a guide shaft is passed through the bearing sleeve; preferably, the upper and lower ends of the guide shaft are respectively connected to the top plate and the bottom plate.

[0015] In a preferred embodiment, the counterweight block is symmetrically provided with grooves, and the inner frame size of the groove matches the outer size of the mover assembly.

[0016] In a preferred embodiment, the elastic member and the guide shaft are respectively arranged diagonally on the counterweight block.

[0017] In a preferred embodiment, two through slots are provided on opposite sides of the counterweight block, the direction of the through slots is parallel to the axis of the stator assembly, and one side of the through slots passes through the top of the counterweight block and extends outward.

[0018] In a preferred embodiment, the protrusion is provided with a chamfer.

[0019] The beneficial effects of the variable air gap high linearity electromagnetic active vibration absorber of the present invention are:

[0020] 1) The thickness of the air gap between the mover and the stator of the electromagnetic active vibration absorber of the present invention changes with the displacement of the mover, so that the total magnetic resistance at the air gap remains unchanged, and the electromagnetic forces between the permanent magnet and the magnetizer at the upper and lower ends of the stator are equal and opposite and cancel each other out, thereby minimizing the displacement nonlinearity of the electromagnetic actuator. The reasons for the displacement nonlinearity of the existing electromagnetic actuators are: the thickness of the air gap remains unchanged, but the length of the air gap changes with the up and down movement of the mover, which makes the magnetic resistance of the air gap change in a nonlinear inverse proportional function law (the magnetic resistance decreases in an inverse proportional law as the air gap length increases). Due to the change in magnetic resistance, the magnetic attraction between the mover and the stator caused by the permanent magnet changes. The magnetic circuit structure proposed by the present invention makes the air gap length and thickness change simultaneously with the displacement of the mover, but the total magnetic resistance remains unchanged, so that a constant magnetic attraction can be maintained. Since the magnetic attraction of the upper and lower parts is constant, the equal and opposite magnetic attraction forces can cancel each other out, minimizing the displacement nonlinearity of the vibration absorber;

[0021] 2) The present invention concentrates all the magnets and copper coils on the mover, so that the mass of the vibration absorber is more concentrated on the mover, thereby reducing the displacement of the mover when the vibration absorber reaches the same output (the output of the vibration absorber is Fa=m·a, m is the mass of the mover, a is the acceleration of the mover, when Fa is constant, the larger the m, the smaller the required a, and the smaller a, the smaller the required mover displacement). Reducing the mover displacement is beneficial to improving the displacement linearity of the active vibration absorber, while improving the volume utilization efficiency of the vibration absorber, and the output requirement can be achieved without reserving a large movement space for the mover. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0023] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0024] Figure 2 It is a schematic front view of the interior of the present invention;

[0025] Figure 3 It is a schematic diagram of the installation of the stator assembly and the mover assembly of the present invention;

[0026] Figure 4 It is the working schematic diagram A of the present invention;

[0027] Figure 5 It is a schematic diagram of the internal structure of Embodiment 2 of the present invention;

[0028] Figure 6 It is the working schematic diagram B of the present invention;

[0029] Figure 7 is a schematic diagram of the internal structure of Embodiment 3 of the present invention;

[0030] Figure 8 is a schematic diagram of the internal structure of Embodiment 4 of the present invention;

[0031] Fig. 9 It is a front view schematic diagram of embodiment 4 of the present invention.

[0032] In the figure: guide shaft 1; top plate 2; second side wall 3; first side wall 4; air gap surface 5; protrusion 6; upper end protrusion 601; lower end protrusion 602; first magnetic conductor 7; magnetic member 8; first magnet 801; second magnet 802; stator assembly 9; stator block 901; second magnetic conductor 10; side plate 1001; baffle 1002; elastic member 11; air gap 12; bottom plate 13; mounting seat 14; coil 15; housing 16; coil frame 17; counterweight 18; groove 1801; through groove 1802; bearing hole 19; bearing sleeve 20; mover assembly 21; spring hole 22; first induced magnetic field 23; first induced magnetic field 24; chamfer 25; reed 26. DETAILED DESCRIPTION

[0033] Example 1

[0034] like Figures 1 to 4 As shown, a variable air gap high linearity electromagnetic active vibration absorber includes a moving subassembly 21, a stator subassembly 9 and a bottom plate 13, wherein the moving subassembly 21 is located outside the stator subassembly 9, the stator subassembly 9 is fixed on the bottom plate 13, an elastic member 11 is provided between the bottom plate 13 and the moving subassembly 21, and an air gap 12 is provided between the stator subassembly 9 and the moving subassembly 21; preferably, a housing 16 is further provided, the housing 16 is detachably connected to a top plate 2, the housing 16 is located above the bottom plate 13, the top plate 2 is located above the housing 16, the elastic member 11 is a spring, and the housing 16 is a cube structure. With this structure, a stable magnetic field is formed between the moving subassembly 21 and the stator subassembly 9, and the moving subassembly 21 moves relative to each other under the action of the electromagnetic force, the spring 11 ensures that the moving subassembly 21 is reset to the initial position during the movement and supports the moving subassembly 21, and the housing 16 ensures the stability of the overall working environment.

[0035] In a preferred embodiment, the stator assembly 9 includes a stator block 901, on which a plurality of protrusions 6 are evenly arranged, and the protrusions 6 include an upper protrusion 601 and a lower protrusion 602. Preferably, the stator block 901 is connected to the top plate 2 and the bottom plate 13 respectively through a mounting seat 14. With this structure, the protrusions 6 make the magnetic flux induced at the "N" pole and the "S" pole on the stator assembly 9 more concentrated when the coil 15 is powered, thereby increasing the magnetic induction intensity at the air gap 12, thereby increasing the output.

[0036] In a preferred embodiment, the movable subassembly 21 includes two first magnetizers 7 arranged in parallel, a magnetic member 8 is arranged between the two first magnetizers 7, the magnetic member 8 includes a first magnet 801 and a second magnet 802 arranged in parallel, a second magnetizer 10 is arranged between the first magnet 801 and the second magnet 802, a coil 15 is arranged in the middle of the second magnetizer 10, and the first magnet 801 and the second magnet 802 are arranged with opposite polarities; preferably, a coil frame 17 is arranged outside the coil 15, and the coil frame 17 is located inside the second magnetizer 10. With this structure, the first magnet 801 and the second magnet 802 are made of permanent magnet material, so that when the coil 15 is energized, a force is generated between the first magnetizer 7 and the second magnetizer 10 due to electromagnetic induction.

[0037] In the preferred embodiment, the second magnetizer 10 includes a side plate 1001, two baffles 1002 are relatively arranged on the side plate 1001, and air gap surfaces 5 for separating the mover assembly 21 and the stator assembly 9 are symmetrically arranged on both sides of the stator assembly 9. The baffle 1002 is inclined toward the magnetic component 8 which is closer to the second side wall 3 close to the stator assembly 9, and the first side wall 4 of the first magnetizer 7 close to the stator assembly 9 is inclined toward the magnetic component 8 which is closer to the third side wall 803 of the magnetic component 8 is parallel to the air gap surface 5, and the vertical distance between the third side wall 803 and the air gap surface 5 is respectively greater than the distance between the end of the first side wall 4 close to the magnetic component 8 and the stator assembly 9 and the distance between the end of the second side wall 1003 close to the magnetic component 8 and the stator assembly 9. According to this structure, the second magnetizer 10 adopts a C-type structure, and the distance between any point on the first side wall 4 of the first magnetizer 7 close to the stator assembly 9 and the air gap surface 5 increases as the distance between the point and the magnetic steel along the moving direction of the movable assembly decreases. The distance between any point on the second side wall 3 of the second magnetizer 10 close to the stator assembly 9 and the air gap surface 5 increases as the distance between the point and the magnetic steel along the moving direction of the movable assembly decreases, thereby making the total magnetic resistance at the air gap 12 unchanged, ensuring that the electromagnetic forces of the permanent magnet 801 and the first magnetizer 7 and the second magnetizer 10 at the upper and lower ends of the stator are equal in magnitude and opposite in direction and cancel each other out, thereby minimizing the displacement nonlinearity of the electromagnet-type electromagnetic actuator.

[0038] In the preferred embodiment, the movable subassembly 21 is provided with a counterweight block 18 on the outside, and a plurality of spring holes 22 and a plurality of bearing holes 19 are provided on the counterweight block 18. The elastic member 11 is inserted into the spring hole 22, and the upper end of the elastic member 11 is connected to the counterweight block 18 by screws. A bearing sleeve 20 is provided in the bearing hole 19, and a guide shaft 1 is inserted into the bearing sleeve 20; preferably, the upper and lower ends of the guide shaft 1 are respectively connected to the top plate 2 and the bottom plate 13. With this structure, the counterweight block 18 and the movable subassembly 21 are bonded together by glue, so that the mass of the movable subassembly can be improved, thereby reducing the displacement of the movable subassembly and improving the linearity.

[0039] In the preferred embodiment, the counterweight 18 is symmetrically provided with grooves 1801, and the inner frame size of the groove 1801 matches the outer size of the movable subassembly 21. This structure ensures the close fit between the counterweight 18 and the movable subassembly 21, high space utilization and stable structure.

[0040] In the preferred embodiment, the elastic member 11 and the guide shaft 1 are respectively arranged diagonally on the counterweight 18. With this structure, the counterweight 18 is subjected to balanced forces under the action of the guide shaft 1 and the elastic member 11, and the movement is more accurate and smooth.

[0041] In the preferred embodiment, two through slots 1802 are provided on opposite sides of the counterweight block 18, the through slots 1802 are parallel to the axis of the stator assembly 9, and one side of the through slot 1802 extends outward through the top of the counterweight block 18. This structure makes the structure compact, and the through slots 1802 are used to pass the wires.

[0042] Example 2

[0043] The difference from the first embodiment is that the N pole of the first magnet 801 faces downward, and the N pole of the second magnet 802 faces upward.

[0044] Example 3

[0045] The difference from Example 1 is that, in the preferred solution, a chamfer 25 is provided at the protrusion 6. Preferably, the chamfer is in the shape of an arc. With this structure, the air gap between the stator assembly 9 and the mover assembly 21 can be varied more to meet the design requirements of different scenarios.

[0046] Example 4

[0047] The difference from the first embodiment is that the housing 16 adopts a cylindrical structure, the elastic member 11 preferably adopts a spring 26, which reduces the use of bearings, and the mover assembly 21 and the stator assembly 9 are radially positioned by the spring 26.

[0048] Working principle:

[0049] The output is mainly generated by the electromagnetic force between the stator assembly 9 and the mover assembly 21 when power is applied. Figure 4 When the current flows in the direction shown, according to the law of electromagnetic induction, the first induced magnetic field 23 is generated in the stator component 9, and the stator component 9 becomes an electromagnet; according to the right-hand screw rule, the magnetic flux lines are emitted from the protrusion 601 at the lower end of the stator component 9 and enter from the protrusion 601 at the upper end of the stator component 9, and the upper end protrusion 601 induces the following Figure 4 At the same time, the first magnet 801 and the second magnet 802 in the moving component 21 form a Figure 4In the closed loop shown, the magnetic flux lines are emitted from the inner side (4) of the first magnetizer, enter from the inner side (3) of the "C"-shaped cross-section magnetizer, induce an "N" pole on the first side wall 4 of the first magnetizer 7 of the mover assembly 21, and induce an "S" pole on the second side wall 3 of the second magnetizer 10. At this time, the "N" poles and "S" poles induced on the mover assembly 21 and the "N" poles and "S" poles induced on the stator assembly 9 respectively form the following Figure 4 The suction or repulsion shown causes the mover to be subjected to a resultant force in a downward direction.

[0050] Similarly, when the coil is Figure 6 When the current flows in the direction shown, according to the law of electromagnetic induction, a second induced magnetic field 24 is generated in the stator assembly 9, and the stator assembly 9 becomes an electromagnet; according to the right-hand screw rule, the magnetic flux lines are emitted from the upper protrusion 601 of the stator assembly 9 and enter from the lower protrusion 602 of the stator assembly 9, and the following is induced at the lower protrusion 602: Figure 6 At the same time, the first magnet 801 and the second magnet 802 in the moving component 21 form a Figure 6 In the closed loop shown, the magnetic flux lines are emitted from the first side wall 4 on the first magnetizer 7, enter from the second side wall 3 of the second magnetizer 10, induce an "N" pole on the first side wall 4 on the first magnetizer 7 at the end of the mover assembly 21, and induce an "S" pole on the second side wall 3 of the second magnetizer 10. At this time, the "N" poles and "S" poles induced on the mover assembly 21 and the "N" poles and "S" poles induced on the stator assembly 9 respectively form the following Figure 6 The suction or repulsion shown causes the mover to be subjected to an upward force.

[0051] In summary, when a sinusoidal alternating current flows through the coil, the protrusions 6 of the stator assembly 9 induce alternating "N" poles and "S" poles, which interact with the "N" pole induced by the mover assembly 21 on the second side wall 3 of the second magnetizer 10 and the "S" pole induced by the first side wall 4 of the first magnetizer 7, so that the mover assembly 21 is subjected to a sinusoidal alternating electromagnetic force.

[0052] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A variable air gap high linearity electromagnetic active vibration absorber, characterized by: Including mover The invention relates to a motor assembly (21), a stator assembly (9) and a bottom plate (13), wherein the moving assembly (21) is located outside the stator assembly (9), the stator assembly (9) is fixed on the bottom plate (13), an elastic member (11) is provided between the bottom plate (13) and the moving assembly (21), an air gap (12) is provided between the stator assembly (9) and the moving assembly (21), the moving assembly (21) comprises two first magnetizers (7) arranged in parallel, a magnetic member (8) is provided between the two first magnetizers (7), the magnetic member (8) comprises a first magnet (801) and a second magnet (802) arranged in parallel, a second magnetizer (10) is provided between the first magnet (801) and the second magnet (802), a coil (15) is provided in the middle of the second magnetizer (10), the first magnet (801) and the second magnet (802) are arranged with opposite polarities, and the second magnetizer (10) comprises a side A plate (1001), two baffles (1002) are arranged on the side plate (1001) in a relative manner, air gap surfaces (5) for separating the moving component (21) and the stator component (9) are symmetrically arranged on both sides of the stator component (9), the second side wall (3) of the baffle (1002) close to the stator component (9) is inclined toward the magnetic component (8) that is closer, the first side wall (4) of the first magnetic conductor (7) close to the stator component (9) is inclined toward the magnetic component (8) that is closer, the distance from the end of the first side wall (4) away from the magnetic component (8) to the axis of the stator component (9) is smaller than the distance from the end of the first side wall (4) close to the magnetic component (8) to the axis of the stator component (9), and the distance from the end of the second side wall (3) away from the magnetic component (8) to the axis of the stator component (9) is smaller than the distance from the end of the second side wall (3) close to the magnetic component (8) to the axis of the stator component (9); The stator assembly (9) comprises a stator block (901), a plurality of protrusions (6) being evenly arranged on the stator block (901), the protrusions (6) comprising an upper end protrusion (601) and a lower end protrusion (602); A counterweight block (18) is provided outside the movable subassembly (21), a plurality of spring holes (22) and a plurality of bearing holes (19) are provided on the counterweight block (18) in a relative manner, the elastic member (11) is passed through the spring hole (22), the upper end of the elastic member (11) is connected to the counterweight block (18) by means of screws, a bearing sleeve (20) is provided in the bearing hole (19), and a guide shaft (1) is passed through the bearing sleeve (20).

2. According to claim 1, a variable air gap high linearity electromagnetic active vibration absorber is characterized by: The protrusion (6) is provided with a chamfer (25).

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