Permanent magnet type dual-drive electric vibration exciter

Abstract

The permanent magnet type dual-drive electric vibration exciter comprises a magnetic circuit assembly and a moving coil assembly, the magnetic circuit assembly comprises a magnetic steel ring, an upper permanent magnet, a lower permanent magnet, a center magnetic pole and a bottom connecting plate, a first containing space and a second containing space are arranged in the magnetic steel ring, the upper permanent magnet is arranged in the first containing space, and the lower permanent magnet is arranged in the second containing space. The moving coil assembly comprises a moving coil framework, a first driving coil and a second driving coil, the first driving coil and the second driving coil are wound on the moving coil framework, the upper permanent magnet, the magnetic steel ring and the center magnetic pole form an upper magnetic field ring space, the first driving coil is located in the upper magnetic field ring space, and the second driving coil is located in the lower magnetic field ring space. The lower permanent magnet, the magnetic steel ring and the central magnetic pole form a lower magnetic field ring space, the second driving coil is located in the lower magnetic field ring space, the central magnetic pole is arranged in the magnetic steel ring, and the bottom connecting plate is arranged at the bottom of the lower magnetic steel ring; two independent magnetic field loops are established, a larger magnetic field is achieved, thrust is increased, the utilization rate of the magnetic field is improved, and higher vertical vibration precision and smaller transverse vibration are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration test equipment, in particular to a permanent magnet double-drive electric vibrator. Background Art

[0002] Permanent magnet electric vibrator is a device that uses the interaction between permanent magnets and electromagnetic coils to achieve vibration energy conversion. It is widely used in mechanical simulation and reliability verification of automotive parts, aerospace products, etc.

[0003] Traditional permanent magnet electric vibrators mostly use a single permanent magnet and single drive coil structure. Due to size limitations, it is difficult to obtain large thrust and cannot meet the vibration test requirements of large mass specimens. Summary of the Invention

[0004] The purpose of the utility model is to provide a permanent magnet dual-drive electric vibrator to solve the above problems.

[0005] The technical solution adopted by this utility model is:

[0006] A permanent magnet dual-drive electric vibrator includes a magnetic circuit assembly and a moving coil assembly, wherein the moving coil assembly is arranged in the magnetic circuit assembly, the magnetic circuit assembly includes a magnetic steel ring, an upper permanent magnet, a lower permanent magnet, a center magnetic pole and a bottom connecting plate, and a first accommodating space and a second accommodating space separated from each other are provided in the magnetic steel ring. The upper permanent magnet is arranged in the first accommodating space, and the lower permanent magnet is arranged in the second accommodating space. The moving coil assembly includes a moving coil frame, a first drive coil and a second drive coil, and the first drive coil and the second drive coil are wound on the moving coil frame. The upper permanent magnet, the magnetic steel ring and the center magnetic pole form an upper magnetic field ring space. The first drive coil is located in the upper magnetic field ring space, and the lower permanent magnet, the magnetic steel ring and the center magnetic pole form a lower magnetic field ring space. The second drive coil is located in the lower magnetic field ring space. The center magnetic pole is arranged in the magnetic steel ring, and the bottom connecting plate is arranged at the bottom of the lower magnetic steel ring.

[0007] As a further improved technical solution of the present invention, the magnetic steel ring includes an upper magnetic steel ring, a middle magnetic steel ring and a lower magnetic steel ring arranged in sequence from top to bottom, the upper magnetic steel ring includes an upper outer ring magnetic steel ring and an upper inner ring magnetic steel ring separated in the radial direction, and a first annular accommodating space is formed between the upper outer ring magnetic steel ring and the upper inner ring magnetic steel ring, the lower magnetic steel ring includes a lower outer ring magnetic steel ring and a lower inner ring magnetic steel ring separated in the radial direction, and a second annular accommodating space is formed between the lower outer ring magnetic steel ring and the lower inner ring magnetic steel ring; the upper outer ring magnetic steel ring, the middle magnetic steel ring, the lower outer ring magnetic steel ring and the bottom connecting plate have the same outer ring diameter D1, and the upper inner ring magnetic steel ring, the middle magnetic steel ring and the lower inner ring magnetic steel ring have the same inner ring diameter d1.

[0008] As a further improved technical solution of the present invention, the upper permanent magnet is an equally divided annular structure, and the magnetic field direction of the upper permanent magnet is radially inward; the lower permanent magnet is an equally divided annular structure, and the magnetic field direction of the lower permanent magnet is radially inward.

[0009] As a further improved technical solution of the present invention, there is a gap between the central magnetic pole and the smallest inner circle of the magnetic steel ring, and the gap is used to install the dynamic coil frame, the first drive coil and the second drive coil.

[0010] As a further improved technical solution of the present invention, the dynamic coil skeleton includes a center column, and three skirt panels are arranged in the axial direction of the center column. The top surface of the skirt panel located at the top is flush with the top surface of the center column, and the bottom surface of the skirt panel located at the bottom is flush with the bottom surface of the center column. A winding fixing ring is arranged between two adjacent skirt panels, and a first drive coil is wound on the inner and outer sides of the winding fixing ring located at the top, and a second drive coil is wound on the inner and outer sides of the winding fixing ring located at the bottom.

[0011] As a further improved technical solution of the present invention, the outer ring diameter D2 of the winding fixing ring is smaller than the outer ring diameter D3 of the skirt plate, and the inner ring diameter d2 of the winding fixing ring is larger than the inner ring diameter d3 of the skirt plate.

[0012] As a further improved technical solution of the present invention, a plurality of upper ribs and a plurality of lower ribs are arranged on the central column, and the three skirt panels are respectively the first skirt panel, the second skirt panel and the third skirt panel from top to bottom. The plurality of upper ribs are evenly distributed circumferentially with the central column as the center, and the upper ribs connect the central column and the first skirt panel. The plurality of lower ribs are evenly distributed circumferentially with the central column as the center, and the lower ribs connect the central column and the third skirt panel.

[0013] As a further improved technical solution of the present invention, a number of upper guide surfaces are provided on the outer side wall of the first skirt panel, and a number of upper guide roller assemblies are provided on the upper inner ring magnetic steel ring, and the upper guide roller assemblies cooperate with the upper guide surfaces; a number of lower guide surfaces are provided on the outer side wall of the third skirt panel, and a number of lower guide roller assemblies are provided on the lower inner ring magnetic steel ring, and the lower guide roller assemblies cooperate with the lower guide surfaces.

[0014] As a further improved technical solution of the present invention, the upper guide surface corresponds to the upper rib plate one-to-one, and the lower guide surface corresponds to the lower rib plate one-to-one.

[0015] As a further improved technical solution of the present invention, the center magnetic pole is arranged between the upper rib plate and the lower rib plate, and the center magnetic pole includes an upper center magnetic pole, a middle center magnetic pole and a lower center magnetic pole arranged in sequence from top to bottom. In the axial position, the upper center magnetic pole corresponds to the upper permanent magnet, the upper center magnetic pole corresponds to the first drive coil, the middle center magnetic pole corresponds to the middle magnetic steel ring, the middle center magnetic pole corresponds to the second skirt plate, the lower center magnetic pole corresponds to the lower permanent magnet, and the lower center magnetic pole corresponds to the second drive coil.

[0016] The beneficial effects of the utility model are:

[0017] Through the above structure, a dual permanent magnet structure is combined to form a dual magnetic field space independent of each other, and two independent magnetic field loops are established with a larger magnetic field. Combined with two sets of drive coils and a dynamic coil skeleton structure, the thrust that the exciter can generate is increased, and the utilization rate of the magnetic field inside the exciter is improved, with higher vertical vibration accuracy and smaller lateral vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a permanent magnet dual-drive electric vibrator;

[0019] Figure 2 This is a schematic diagram of the internal structure of a permanent magnet dual-drive electric vibrator;

[0020] Figure 3 It is a schematic diagram of the overall structure of the magnetic circuit assembly;

[0021] Figure 4 It is a schematic diagram of the internal structure of the magnetic circuit component;

[0022] Figure 5 It is a schematic diagram of the overall structure of the dynamic coil assembly;

[0023] Figure 6 It is a schematic diagram of the internal structure of the dynamic coil assembly;

[0024] Figure 7 It is a schematic diagram of the overall structure of the dynamic coil frame;

[0025] Figure 8 It is a schematic diagram of the internal structure of the dynamic coil frame.

[0026] Among them: 1-magnetic circuit assembly, 11-magnetic steel ring, 111-upper outer ring magnetic steel ring, 112-upper inner ring magnetic steel ring, 113-middle magnetic steel ring, 114-lower outer ring magnetic steel ring, 115-lower inner ring magnetic steel ring, 12-upper permanent magnet, 13-lower permanent magnet, 14-center magnetic pole, 141-upper center magnetic pole, 142-middle center magnetic pole, 143-lower center magnetic pole, 15-bottom connecting plate, 2-moving coil assembly, 21-moving coil skeleton, 211-center column, 212-first skirt plate, 213-second skirt plate, 214-third skirt plate, 215-winding fixing ring, 216-upper rib plate, 217-lower rib plate, 218-upper guide surface, 219-lower guide surface, 22-first drive coil, 23-second drive coil, 3-upper guide roller assembly, 4-lower guide roller assembly. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0028] If the present invention involves directions (e.g., up, down, left, right, front, back, outside, inside, etc.), the directions involved need to be defined, for example, "To clearly express the positions and directions described in this invention, the end closest to the operator is the proximal end, and the end away from the operator is the distal end." Or, the paper can be used as a reference for definition. Of course, if the subsequent description defines the positional relationship between the two by mutual reference, this definition does not need to be included here.

[0029] A permanent magnet dual drive electric vibrator, such as Figure 1 As shown, it includes a magnetic circuit assembly 1 and a dynamic coil assembly 2. The dynamic coil assembly 2 is arranged in the magnetic circuit assembly 1. When powered, the dynamic coil assembly 2 can reciprocate under the drive of the magnetic circuit assembly 1. The dynamic coil assembly 2 includes a dynamic coil frame 21 and two sets of drive coils wound on the dynamic coil frame 21.

[0030] like Figures 2-4As shown, the magnetic circuit assembly 1 includes a magnetic steel ring 11, an upper permanent magnet 12, a lower permanent magnet 13, a central magnetic pole 14 and a bottom connecting plate 15. A first accommodating space and a second accommodating space separated from each other are provided in the magnetic steel ring 11. The upper permanent magnet 12 is provided in the first accommodating space, and the lower permanent magnet 13 is provided in the second accommodating space. The moving coil assembly 2 includes a moving coil frame 21, a first drive coil 22 and a second drive coil 23. The first drive coil 22 and the second drive coil 23 are wound on the moving coil frame 21. The upper permanent magnet 12, the magnetic steel ring 11 and the central magnetic pole 14 form an upper magnetic field ring space. The first drive coil 22 is located in the upper magnetic field ring space. The lower permanent magnet 13, the magnetic steel ring 11 and the central magnetic pole 14 form a lower magnetic field ring space. The second drive coil 23 is located in the lower magnetic field ring space. The central magnetic pole 14 is provided in the magnetic steel ring 11. The bottom connecting plate 15 is provided at the bottom of the lower magnetic steel ring.

[0031] The magnetic steel ring 11 includes an upper magnetic steel ring, a middle magnetic steel ring 113 and a lower magnetic steel ring arranged in sequence from top to bottom, the upper magnetic steel ring includes an upper outer ring magnetic steel ring 111 and an upper inner ring magnetic steel ring 112 separated in the radial direction, a first annular accommodating space is formed between the upper outer ring magnetic steel ring 111 and the upper inner ring magnetic steel ring 112, and the upper permanent magnet 12 is arranged in the first accommodating space, the lower magnetic steel ring includes a lower outer ring magnetic steel ring 114 and a lower inner ring magnetic steel ring 115 separated in the radial direction, a second annular accommodating space is formed between the lower outer ring magnetic steel ring 114 and the lower inner ring magnetic steel ring 115, and the lower permanent magnet 13 is arranged in the second accommodating space.

[0032] The upper outer magnetic steel ring 111, the middle magnetic steel ring 113, the lower outer magnetic steel ring 114 and the bottom connecting plate 15 have the same outer ring diameter D1, and the upper inner magnetic steel ring 112, the middle magnetic steel ring 113 and the lower inner magnetic steel ring 115 have the same inner ring diameter d1.

[0033] The bottom connecting plate 15 is disposed at the bottom of the lower magnetic steel ring, and the center magnetic pole 14 and the magnetic steel ring 11 are connected via the bottom connecting plate 15 .

[0034] The upper permanent magnet 12 is an equally divided annular structure, that is, the upper permanent magnet 12 is composed of several substructures combined to form an annular shape, and the substructures are separated from each other. The magnetic field direction of the upper permanent magnet 12 is radially inward, and the lower permanent magnet 13 is an equally divided annular structure, and the magnetic field direction is radially inward. Figure 4 As shown, an upper magnetic field ring space and a lower magnetic field ring space are formed inside the magnetic circuit assembly 1, the upper magnetic field ring space corresponds to the first drive coil 22 of the moving coil assembly 2, and the magnetic field direction of the upper magnetic field ring space is radially inward, the lower magnetic field ring space corresponds to the second drive coil 23 of the moving coil assembly 2, and the magnetic field direction of the lower magnetic field ring space is radially inward.

[0035] like Figures 5 to 8 As shown, the dynamic coil skeleton 21 includes a central column 211, and three skirts are arranged in the axial direction of the central column 211. The top surface of the skirt located at the top is flush with the top surface of the central column 211, and the bottom surface of the skirt located at the bottom is flush with the bottom surface of the central column 211. A winding fixing ring 215 is provided between two adjacent skirts, and a driving coil is wound on the inner and outer sides of each winding fixing ring 215, that is, a first driving coil 22 is wound on the inner and outer sides of the winding fixing ring 215 located above, and a second driving coil 23 is wound on the inner and outer sides of the winding fixing ring 215 located below.

[0036] The outer diameter D2 of the winding fixing ring 215 is smaller than the outer diameter D3 of the skirt plate, and the inner diameter d2 of the winding fixing ring 215 is larger than the inner diameter d3 of the skirt plate.

[0037] The center column 211 is provided with a plurality of upper ribs 216 and a plurality of lower ribs 217. The three skirt panels are, from top to bottom, a first skirt panel 212, a second skirt panel 213, and a third skirt panel 214. The upper ribs 216 are evenly distributed circumferentially around the center column 211, connecting the center column 211 and the first skirt panel 212. The lower ribs 217 are evenly distributed circumferentially around the center column 211, connecting the center column 211 and the third skirt panel 214. The provision of the upper ribs 216 and the lower ribs 217 enhances the connection strength of the dynamic coil frame 21 and improves the operational stability and reliability of the dynamic coil frame 21 during operation.

[0038] A plurality of upper guide surfaces 218 are provided on the outer wall of the first skirt plate 212, and the upper guide surfaces 218 extend axially, and the plurality of upper guide surfaces 218 are uniformly distributed circumferentially; a plurality of lower guide surfaces 219 are provided on the outer wall of the third skirt plate 214, and the lower guide surfaces 219 extend axially, and the plurality of lower guide surfaces 219 are uniformly distributed circumferentially; a plurality of upper guide roller assemblies 3 are provided on the upper inner ring magnetic steel ring 112, and the upper guide roller assemblies 3 cooperate with the upper guide surfaces 218 to form a rolling guide pair, and a plurality of lower guide roller assemblies 4 are provided on the lower inner ring magnetic steel ring 115, and the lower guide roller assemblies 4 cooperate with the lower guide surfaces 219 to form a rolling guide pair, thereby guiding the direction and movement of the moving coil assembly 2 when inserted into the magnetic circuit assembly 1.

[0039] The number and position of the upper guide surfaces 218 correspond one-to-one with the number and position of the upper ribs 216, and the number and position of the lower guide surfaces 219 correspond one-to-one with the number and position of the lower ribs 217, thereby enhancing the connection strength and improving the ease of operation. As an embodiment of the present invention, there are four upper ribs 216, four upper guide surfaces 218, four upper guide roller assemblies 3, four lower ribs 217, four lower guide surfaces 219, and four lower guide roller assemblies 4.

[0040] An arc chamfer is provided at the connection between the upper rib 216 and the first skirt 212, and an arc chamfer is provided at the connection between the lower rib 217 and the third skirt 214. The above arc chamfers are used to enhance the connection strength, avoid stress concentration at the connection, increase the stiffness of the dynamic coil frame 21, and thus increase the resonance frequency of the dynamic coil assembly 2.

[0041] There is a gap between the central magnetic pole 14 and the smallest inner circle of the magnetic steel ring 11 , and the gap is used to install the moving coil frame 21 , the first driving coil 22 and the second driving coil 23 .

[0042] The center magnetic pole 14 includes an upper center magnetic pole 141, a middle center magnetic pole 142 and a lower center magnetic pole 143 arranged in sequence from top to bottom, wherein the upper center magnetic pole 141 is an equally divided annular structure, that is, the upper center magnetic pole 141 is composed of several substructures combined to form an annular shape, and the above substructures are separated from each other, the lower center magnetic pole 143 is an equally divided annular structure, and the middle center magnetic pole 142 is an annular structure. As an embodiment of the present utility model, the upper center magnetic pole 141 is a four-divided annular shape, and the lower center magnetic pole 143 is a four-divided annular shape.

[0043] In the axial position, the center magnetic pole 14 is located between the upper rib plate 216 and the lower rib plate 217, the upper center magnetic pole 141 corresponds to the upper permanent magnet, the upper center magnetic pole 141 corresponds to the first drive coil 22, the middle center magnetic pole 142 corresponds to the middle magnetic steel ring 113, the middle center magnetic pole 142 corresponds to the second skirt plate 213, the lower center magnetic pole 143 corresponds to the lower permanent magnet 13, and the lower center magnetic pole 143 corresponds to the second drive coil 23.

[0044] The permanent magnet dual-drive electric vibrator provided by the present invention adopts a dual permanent magnet structure combination to form a dual magnetic field space. The dual magnetic field spaces are independent of each other, and two independent magnetic field loops are established. Compared with the single permanent magnet structure, it has a larger magnetic field. At the same time, with the two sets of drive coils, the thrust that the vibrator can generate is increased, and the utilization rate of the magnetic field inside the vibrator is improved. The addition of an adaptive dynamic coil frame 21 structure enhances the strength and rigidity of the dynamic coil frame 21, and has higher vertical vibration accuracy and smaller lateral vibration.

[0045] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0046] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A permanent magnet dual-drive electric vibrator, characterized in that: The invention comprises a magnetic circuit component (1) and a moving coil component (2), wherein the moving coil component (2) is arranged in the magnetic circuit component (1), the magnetic circuit component (1) comprises a magnetic steel ring (11), an upper permanent magnet (12), a lower permanent magnet (13), a center magnetic pole (14) and a bottom connecting plate (15), and a first accommodating space and a second accommodating space separated from each other are arranged in the magnetic steel ring (11), the upper permanent magnet (12) is arranged in the first accommodating space, and the lower permanent magnet (13) is arranged in the second accommodating space, and the moving coil component (2) comprises a moving coil frame (21), a first driving coil (22) and a second driving coil. A moving coil (23), the first driving coil (22) and the second driving coil (23) are wound on a moving coil frame (21), the upper permanent magnet (12), the magnetic steel ring (11), and the center magnetic pole (14) form an upper magnetic field ring space, the first driving coil (22) is located in the upper magnetic field ring space, the lower permanent magnet (13), the magnetic steel ring (11), and the center magnetic pole (14) form a lower magnetic field ring space, the second driving coil (23) is located in the lower magnetic field ring space, the center magnetic pole (14) is arranged in the magnetic steel ring (11), and the bottom connecting plate (15) is arranged at the bottom of the lower magnetic steel ring.

2. The permanent magnet dual-drive electric vibrator according to claim 1, characterized in that: The magnetic steel ring (11) comprises an upper magnetic steel ring, a middle magnetic steel ring (113) and a lower magnetic steel ring which are arranged in sequence from top to bottom. The upper magnetic steel ring comprises an upper outer magnetic steel ring (111) and an upper inner magnetic steel ring (112) which are separated in the radial direction. A first annular accommodation space is formed between the upper outer magnetic steel ring (111) and the upper inner magnetic steel ring (112). The lower magnetic steel ring comprises a lower outer magnetic steel ring (114) and a lower inner magnetic steel ring (115) which are separated in the radial direction. A magnetic steel ring (115) is provided, wherein a second annular accommodation space is formed between the lower outer magnetic steel ring (114) and the lower inner magnetic steel ring (115); the upper outer magnetic steel ring (111), the middle magnetic steel ring (113), the lower outer magnetic steel ring (114) and the bottom connecting plate (15) have the same outer ring diameter D1, and the upper inner magnetic steel ring (112), the middle magnetic steel ring (113) and the lower inner magnetic steel ring (115) have the same inner ring diameter d1.

3. The permanent magnet dual-drive electric vibrator according to claim 2, characterized in that: The upper permanent magnet (12) is an equally divided annular structure, and the magnetic field direction of the upper permanent magnet (12) is radially inward; the lower permanent magnet (13) is an equally divided annular structure, and the magnetic field direction of the lower permanent magnet (13) is radially inward.

4. The permanent magnet dual-drive electric vibrator according to claim 3, characterized in that: There is a gap between the central magnetic pole (14) and the smallest inner circle of the magnetic steel ring (11), and the gap is used to install the moving coil frame (21), the first driving coil (22) and the second driving coil (23).

5. The permanent magnet dual-drive electric vibrator according to claim 3, characterized in that: The dynamic coil frame (21) includes a central column (211), and three skirts are arranged in the axial direction of the central column (211). The top surface of the skirt located at the top is flush with the top surface of the central column (211), and the bottom surface of the skirt located at the bottom is flush with the bottom surface of the central column (211). A winding fixing ring (215) is arranged between two adjacent skirts. A first driving coil (22) is wound on the inner and outer sides of the winding fixing ring (215) located at the top, and a second driving coil (23) is wound on the inner and outer sides of the winding fixing ring (215) located at the bottom.

6. The permanent magnet dual-drive electric vibrator according to claim 5, characterized in that: The outer ring diameter D2 of the winding fixing ring (215) is smaller than the outer ring diameter D3 of the skirt plate, and the inner ring diameter d2 of the winding fixing ring (215) is larger than the inner ring diameter d3 of the skirt plate.

7. The permanent magnet dual-drive electric vibrator according to claim 5, characterized in that: A plurality of upper ribs (216) and a plurality of lower ribs (217) are provided on the central column (211), and the three skirt plates are respectively a first skirt plate (212), a second skirt plate (213) and a third skirt plate (214) from top to bottom. The plurality of upper ribs (216) are uniformly distributed circumferentially with the central column (211) as the center, and the upper ribs (216) connect the central column (211) and the first skirt plate (212). The plurality of lower ribs (217) are uniformly distributed circumferentially with the central column (211) as the center, and the lower ribs (217) connect the central column (211) and the third skirt plate (214).

8. The permanent magnet dual-drive electric vibrator according to claim 7, characterized in that: A plurality of upper guide surfaces (218) are provided on the outer wall of the first skirt plate (212), a plurality of upper guide roller assemblies (3) are provided on the upper inner ring magnetic steel ring (112), and the upper guide roller assemblies (3) cooperate with the upper guide surfaces (218); a plurality of lower guide surfaces (219) are provided on the outer wall of the third skirt plate (214), a plurality of lower guide roller assemblies (4) are provided on the lower inner ring magnetic steel ring (115), and the lower guide roller assemblies (4) cooperate with the lower guide surfaces (219).

9. The permanent magnet dual-drive electric vibrator according to claim 8, characterized in that: The upper guide surface (218) corresponds to the upper rib plate (216) in a one-to-one manner, and the lower guide surface (219) corresponds to the lower rib plate (217) in a one-to-one manner.

10. The permanent magnet dual-drive electric vibrator according to claim 3, characterized in that: The central magnetic pole (14) is arranged between the upper rib plate (216) and the lower rib plate (217). The central magnetic pole (14) includes an upper central magnetic pole (141), a middle central magnetic pole (142) and a lower central magnetic pole (143) arranged in sequence from top to bottom. In the axial position, the upper central magnetic pole (141) corresponds to the upper permanent magnet, the upper central magnetic pole (141) corresponds to the first driving coil (22), the middle central magnetic pole (142) corresponds to the middle magnetic steel ring (113), the middle central magnetic pole (142) corresponds to the second skirt plate (213), the lower central magnetic pole (143) corresponds to the lower permanent magnet (13), and the lower central magnetic pole (143) corresponds to the second driving coil (23).

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