Permanent magnet double drive electric exciter

Abstract

The application provides a permanent magnet type double-drive electric vibration exciter, which 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. The magnetic steel ring is provided with a first accommodating space and a second accommodating space. 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 comprises a moving coil framework, a first drive coil and a second drive coil. The first drive coil and the second drive coil are arranged 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, and the first drive coil is arranged in the upper magnetic field ring space. The lower permanent magnet, the magnetic steel ring and the center magnetic pole form a lower magnetic field ring space, and the second drive coil is arranged 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. Two independent magnetic field loops are established, the magnetic field is larger, the thrust is increased, the utilization rate of the magnetic field is improved, the vertical vibration precision is higher and the horizontal vibration is smaller.

Description

Technical Field

[0001] This invention relates to the field of vibration testing equipment technology, specifically to a permanent magnet dual-drive electric vibrator. Background Technology

[0002] Permanent magnet electric vibrators are devices that convert vibration energy using the interaction between permanent magnets and electromagnetic coils. They are widely used in mechanical simulation and reliability verification of automotive parts, aerospace products, and other products.

[0003] Traditional permanent magnet electric vibrators mostly adopt a single permanent magnet and single drive coil structure. Under size constraints, 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 this invention is to provide a permanent magnet dual-drive electric vibrator to solve the above-mentioned problems.

[0005] The technical solution adopted in this invention is as follows:

[0006] A permanent magnet dual-drive electric vibrator includes a magnetic circuit assembly and a moving coil assembly. The moving coil assembly is disposed within the magnetic circuit assembly. The magnetic circuit assembly includes a magnetic ring, an upper permanent magnet, a lower permanent magnet, a central magnetic pole, and a bottom connecting plate. A first accommodating space and a second accommodating space are provided within the magnetic ring, separated vertically. The upper permanent magnet is disposed within the first accommodating space, and the lower permanent magnet is disposed within the second accommodating space. The moving coil assembly includes a moving coil frame, a first driving coil, and a second driving coil. The first and second driving coils are wound around the moving coil frame. The upper permanent magnet, the magnetic ring, and the central magnetic pole form an upper magnetic field ring space, and the first driving coil is located within the upper magnetic field ring space. The lower permanent magnet, the magnetic ring, and the central magnetic pole form a lower magnetic field ring space, and the second driving coil is located within the lower magnetic field ring space. The central magnetic pole is disposed within the magnetic ring, and the bottom connecting plate is disposed at the bottom of the lower magnetic 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 sequentially 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 an annular first 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 an annular second 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 ring structure, and the magnetic field direction of the upper permanent magnet is radially inward; the lower permanent magnet is an equally divided ring structure, and the magnetic field direction of the lower permanent magnet is radially inward.

[0009] As a further improvement of the present invention, there is a gap between the central magnetic pole and the smallest inner ring of the magnetic steel ring, and the gap is used to install the moving coil frame, the first driving coil and the second driving coil.

[0010] As a further improved technical solution of the present invention, the moving coil frame includes a central column, and three skirts are arranged in the axial direction of the central column. The top surface of the top skirt is flush with the top surface of the central column, and the bottom surface of the bottom skirt is flush with the bottom surface of the central column. A winding fixing ring is arranged between two adjacent skirts. A first driving coil is wound on the inner and outer sides of the upper winding fixing ring, and a second driving coil is wound on the inner and outer sides of the lower winding fixing ring.

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

[0012] As a further improved technical solution of the present invention, a plurality of upper stiffening plates and a plurality of lower stiffening plates are provided on the central column. The three skirt plates are, from top to bottom, a first skirt plate, a second skirt plate, and a third skirt plate. The plurality of upper stiffening plates are evenly distributed around the central column, and the upper stiffening plates connect the central column and the first skirt plate. The plurality of lower stiffening plates are evenly distributed around the central column, and the lower stiffening plates connect the central column and the third skirt plate.

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

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

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

[0016] The beneficial effects of this invention are as follows:

[0017] The above structure uses a combination of two permanent magnet structures to form independent dual magnetic field spaces, establishing two independent magnetic field loops with a larger magnetic field. Combined with two sets of drive coils and a moving coil frame structure, it increases the thrust that the exciter can generate, improves the utilization rate of the magnetic field inside the exciter, and has higher vertical vibration accuracy and less lateral vibration. Attached Figure Description

[0018] Figure 1 This 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 This is a schematic diagram of the overall structure of the magnetic circuit assembly;

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

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

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

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

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

[0026] Wherein: 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-Central magnetic pole, 141-Upper central magnetic pole, 142-Middle central magnetic pole, 143-Lower central magnetic pole, 15-Bottom connecting plate, 2-Moving coil assembly, 21-Moving coil skeleton, 211-Central column, 212-First skirt plate, 213-Second skirt plate, 214-Third skirt plate, 215-Winding fixing ring, 216-Upper stiffener, 217-Lower stiffener, 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 Implementation

[0027] The present invention will now be described in detail 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 those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0028] If the description of this invention involves orientation (e.g., up, down, left, right, front, back, outside, inside, etc.), then the orientations involved need to be defined. For example, "To clearly express the positions and directions described in this invention, the end closer to the operator is the proximal end, and the end farther from the operator is the distal end," or the paper surface can be used as a reference. Of course, if the positional relationship between the two is defined by mutual reference in the subsequent description, then this definition is not necessary.

[0029] A permanent magnet dual-drive electric vibrator, such as Figure 1 As shown, the device includes a magnetic circuit assembly 1 and a moving coil assembly 2. The moving coil assembly 2 is disposed within the magnetic circuit assembly 1. When energized, the moving coil assembly 2 can reciprocate under the drive of the magnetic circuit assembly 1. The moving coil assembly 2 includes a moving coil frame 21 and two sets of drive coils wound on the moving 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 vertically, are provided within the magnetic steel ring 11. The upper permanent magnet 12 is disposed within the first accommodating space, and the lower permanent magnet 13 is disposed within the second accommodating space. The moving coil assembly 2 includes a moving coil frame 21, a first driving coil 22, and a second driving coil 23. The first driving coil 22 and the second driving coil 23 are wound around 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, with the first driving coil 22 located within 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, with the second driving coil 23 located within the lower magnetic field ring space. The central magnetic pole 14 is disposed within the magnetic steel ring 11, and the bottom connecting plate 15 is disposed 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 sequentially 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 arranged radially apart. An annular first accommodating space is formed between the upper outer ring magnetic steel ring 111 and the upper inner ring magnetic steel ring 112. The upper permanent magnet 12 is disposed 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 arranged radially apart. An annular second accommodating space is formed between the lower outer ring magnetic steel ring 114 and the lower inner ring magnetic steel ring 115. The lower permanent magnet 13 is disposed in the second accommodating space.

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

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

[0034] The upper permanent magnet 12 has an equally divided ring structure, meaning it is composed of several substructures arranged in a ring shape, with these substructures separated from each other. The magnetic field direction of the upper permanent magnet 12 is radially inward. The lower permanent magnet 13 also has an equally divided ring structure, with its magnetic field direction 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 driving 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 driving 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 5-8 As shown, the moving coil frame 21 includes a central column 211, and three skirts are arranged along the axial direction of the central column 211. The top surface of the top skirt is flush with the top surface of the central column 211, and the bottom surface of the bottom skirt is flush with the bottom surface of the central column 211. A winding fixing ring 215 is arranged between two adjacent skirts. 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 upper winding fixing ring 215, and a second driving coil 23 is wound on the inner and outer sides of the lower winding fixing ring 215.

[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] A plurality of upper stiffening plates 216 and a plurality of lower stiffening plates 217 are provided on the central column 211. The three skirts, from top to bottom, are the first skirt 212, the second skirt 213, and the third skirt 214. The plurality of upper stiffening plates 216 are evenly distributed circumferentially around the central column 211, and the upper stiffening plates 216 connect the central column 211 and the first skirt 212. The plurality of lower stiffening plates 217 are evenly distributed circumferentially around the central column 211, and the lower stiffening plates 217 connect the central column 211 and the third skirt 214. The provision of the upper stiffening plates 216 and lower stiffening plates 217 can enhance the connection strength of the moving coil frame 21 and improve the operational stability and reliability of the moving coil frame 21 during operation.

[0038] A plurality of upper guide surfaces 218 are provided on the outer side wall of the first skirt plate 212, the upper guide surfaces 218 extending axially and being evenly distributed circumferentially; a plurality of lower guide surfaces 219 are provided on the outer side wall of the third skirt plate 214, the lower guide surfaces 219 extending axially and being evenly distributed circumferentially; a plurality of upper guide roller assemblies 3 are provided on the upper inner ring magnetic steel ring 112, the upper guide roller assemblies 3 cooperating with the upper guide surfaces 218 to form a rolling guide pair; a plurality of lower guide roller assemblies 4 are provided on the lower inner ring magnetic steel ring 115, the lower guide roller assemblies 4 cooperating with the lower guide surfaces 219 to form a rolling guide pair, thereby guiding the direction and movement of the moving coil assembly 2 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 stiffeners 216, and the number and position of the lower guide surfaces 219 correspond one-to-one with the number and position of the lower stiffeners 217, thereby enhancing connection strength and improving ease of operation. In one embodiment of the invention, there are four upper stiffeners 216, four upper guide surfaces 218, four upper guide roller assemblies 3, four lower stiffeners 217, four lower guide surfaces 219, and four lower guide roller assemblies 4.

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

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

[0042] 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 sequentially from top to bottom. The upper central magnetic pole 141 is a bisected ring structure, that is, the upper central magnetic pole 141 is composed of several substructures that are combined to form a ring, and the substructures are separated from each other. The lower central magnetic pole 143 is a bisected ring structure, and the middle central magnetic pole 142 is a ring structure. As an embodiment of the present invention, the upper central magnetic pole 141 is a four-part ring, and the lower central magnetic pole 143 is a four-part ring.

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

[0044] The permanent magnet dual-drive electric vibrator provided by this invention adopts a dual permanent magnet structure to form a dual magnetic field space. The dual magnetic field spaces are independent of each other, establishing two independent magnetic field loops. Compared with a single permanent magnet structure, it has a larger magnetic field. At the same time, with the cooperation of 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 a suitable moving coil frame 21 structure enhances the strength and rigidity of the moving coil frame 21, resulting in higher vertical vibration accuracy and smaller lateral vibration.

[0045] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A permanent magnet dual-drive electric vibrator, characterized in that: The system includes a magnetic circuit assembly (1) and a moving coil assembly (2). The moving coil assembly (2) is disposed within the magnetic circuit assembly (1). The magnetic circuit assembly (1) includes a magnetic 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, which are separated vertically, are provided within the magnetic ring (11). The upper permanent magnet (12) is disposed within the first accommodating space, and the lower permanent magnet (13) is disposed within the second accommodating space. The moving coil assembly (2) includes a moving coil frame (21), a first driving coil (22), and a second driving coil. The moving coil (23), the first driving coil (22) and the second driving 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 driving 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 driving coil (23) is located in the lower magnetic field ring space. The central magnetic pole (14) is set in the magnetic steel ring (11). The bottom connecting plate (15) is set at the bottom of the lower magnetic steel ring. The moving 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 top skirt is flush with the top surface of the central column (211), and the bottom surface of the bottom skirt 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 upper winding fixing ring (215), and a second driving coil (23) is wound on the inner and outer sides of the lower winding fixing ring (215).

2. The permanent magnet dual-drive electric vibrator according to claim 1, characterized in that: The magnet ring (11) includes an upper magnet ring, a middle magnet ring (113), and a lower magnet ring arranged sequentially from top to bottom. The upper magnet ring includes an upper outer ring magnet ring (111) and an upper inner ring magnet ring (112) arranged radially apart. An annular first accommodating space is formed between the upper outer ring magnet ring (111) and the upper inner ring magnet ring (112). The lower magnet ring includes a lower outer ring magnet ring (114) and a lower inner ring magnet ring arranged radially apart. A second annular accommodating space is formed between the lower outer ring magnetic ring (114) and the lower inner ring magnetic ring (115); the upper outer ring magnetic ring (111), the middle magnetic ring (113), the lower outer ring magnetic ring (114) and the bottom connecting plate (15) have the same outer ring diameter D1, and the upper inner ring magnetic ring (112), the middle magnetic ring (113) and the lower inner ring magnetic 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) has an equally divided ring structure, and the magnetic field direction of the upper permanent magnet (12) is radially inward. The lower permanent magnet (13) has an equally divided ring 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 ring 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 1, characterized in that: 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.

6. The permanent magnet dual-drive electric vibrator according to claim 3, characterized in that: A plurality of upper stiffening plates (216) and a plurality of lower stiffening plates (217) are provided on the central column (211). The three skirts are, from top to bottom, the first skirt (212), the second skirt (213), and the third skirt (214). The plurality of upper stiffening plates (216) are evenly distributed around the central column (211) and connect the central column (211) and the first skirt (212). The plurality of lower stiffening plates (217) are evenly distributed around the central column (211) and connect the central column (211) and the third skirt (214).

7. The permanent magnet dual-drive electric vibrator according to claim 6, characterized in that: A plurality of upper guide surfaces (218) are provided on the outer side wall of the first skirt plate (212), and a plurality of upper guide roller assemblies (3) are provided on the upper inner ring magnet (112). 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 side wall of the third skirt plate (214), and a plurality of lower guide roller assemblies (4) are provided on the lower inner ring magnet (115). The lower guide roller assemblies (4) cooperate with the lower guide surfaces (219).

8. The permanent magnet dual-drive electric vibrator according to claim 7, characterized in that: The upper guide surface (218) corresponds one-to-one with the upper stiffening plate (216), and the lower guide surface (219) corresponds one-to-one with the lower stiffening plate (217).

9. The permanent magnet dual-drive electric vibrator according to claim 3, characterized in that: The central magnetic pole (14) is disposed between the upper stiffener (216) and the lower stiffener (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 sequentially 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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