CN111649892A - Magnetic guide structure of moving coil, vibrating table with magnetic guide structure and adjusting method - Google Patents
Magnetic guide structure of moving coil, vibrating table with magnetic guide structure and adjusting method Download PDFInfo
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- CN111649892A CN111649892A CN202010621478.1A CN202010621478A CN111649892A CN 111649892 A CN111649892 A CN 111649892A CN 202010621478 A CN202010621478 A CN 202010621478A CN 111649892 A CN111649892 A CN 111649892A
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- moving coil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
Abstract
The invention relates to a magnetic guide structure of a moving coil, a vibrating table with the magnetic guide structure and an adjusting method, wherein the magnetic guide structure comprises an armature and an electromagnetic coil matched with the armature, a magnetic field is formed by electrifying the electromagnetic coil, and a gap is formed between the electromagnetic coil and the armature; the adjusting method comprises the steps of S1, position acquisition, acquisition of the distance between the moving coil and the cylinder body through the displacement sensor and feedback of the distance to the controller; s2, processing signals, comparing the collected distance signals in multiple directions by the controller, and calculating to obtain difference values in all directions, and calculating to obtain the current in the electromagnetic coil in all directions by the controller according to the difference values; and S3, adjusting the position, wherein the controller outputs a current value to the electromagnetic coil to adjust the position of the moving coil so that the moving coil is positioned at the center position. The problem of the vibrating table movable coil low frequency distortion big is solved, simultaneously also can reduce the movable coil guide part wearing and tearing big, the loss is big, can also solve the guide part in use low frequency and have the resonant abnormal sound problem.
Description
Technical Field
The invention relates to the technical field of vibration tests, in particular to a magnetic guide structure of a moving coil, a vibration table with the magnetic guide structure and an adjusting method.
Background
The electric vibration table can simulate various vibration mechanical environments and is widely applied to simulation tests of various typical vibrations of automobile parts, electronic components, aerospace product stress screening and the like. In the design and manufacture of the vibration table, the moving coil guide is particularly important, and the moving coil guide directly influences the distortion index of the table body.
At present, electric vibration tables at home and abroad guide the motion of a movable coil of the vibration table in order to restrict the motion of the movable coil in a desired direction and reduce the motion in other directions, and two types of guide devices are generally used at present. As shown in fig. 1, the first type is a guide wheel guide mechanism 8, which is divided into an upper guide wheel guide mechanism 8 and a lower guide wheel guide mechanism 8, the upper guide wheel guide mechanism and the lower guide wheel guide mechanism are divided into a plurality of guide wheel guide assemblies, the guide wheel guide mechanism 8 has the advantage of simplicity, and because the lower guide wheel guide mechanism 8 has a small volume, an air spring for supporting the weight of the moving coil 3 and a test piece can be directly installed, and the defect is that 1, because the guide wheel guide mechanism 8 is in direct contact and friction with the moving coil 3, the telemechanical action of the moving coil 3 is disturbed, and; 2. the guide wheel guide mechanism 8 has limited anti-unbalance loading capability; 3. the large displacement vibration is limited by the upper guide wheel guide mechanism 8, the deflection angle cannot be too large, and the guide wheel guide mechanism 8 may be large. The second type is a hydrostatic pressure guide mechanism 9 which is also divided into an upper group and a lower group as shown in FIG. 2, and has the advantages of larger unbalance loading resistance and theoretically no contact between no pressure loss and a telemechanical part; the defects that 1, because the moving frequency range of the moving coil 3 is wider (5-3000Hz) and the moving acceleration is large (100g), great difficulty is caused to oil sealing, and the problem of oil leakage is difficult to solve; 2. the air spring which can not directly connect and support the moving coil 3 and the weight of the test piece can only seal the whole vibration table space to form a large air chamber, and the sealing is difficult because of the connection of the vibration table and the external water pipe and the cable.
Disclosure of Invention
The invention aims to solve the technical problem of providing a magnetic guide structure of a moving coil, a vibrating table with the magnetic guide structure and an adjusting method, which can avoid the defects of a guide wheel guide structure and a hydraulic static pressure guide mechanism.
The technical scheme adopted by the invention for solving the technical problems is as follows: a magnetic guide structure of a moving coil is arranged between the moving coil on a vibration table and a cylinder body and comprises an armature and an electromagnetic coil matched with the armature, wherein the electromagnetic coil is electrified to form a magnetic field, and a gap is formed between the electromagnetic coil and the armature.
More specifically, a displacement sensor for detecting the distance between the moving coil and the cylinder body is arranged on the cylinder body, a controller is arranged on the vibration table, and the controller receives a signal of the displacement sensor and controls the current of the electromagnetic coil.
More specifically, the displacement sensor is a differential transformer type displacement sensor.
A vibrating table comprises a cylinder body support fixed on the ground, a cylinder body arranged on the cylinder body support, a moving coil positioned in the cylinder body, a magnet arranged in the cylinder body and a winding wound on the moving coil, wherein the magnetic guide structure is adopted between the upper part of the moving coil and the cylinder body as an upper guide assembly, and the magnetic guide structure is adopted between the bottom of the moving coil and the cylinder body as a lower guide assembly.
More specifically, the upper guide assemblies are at least three groups and are uniformly distributed around the moving coil.
More specifically, the lower guide assemblies are at least three groups and are uniformly distributed around the moving coil.
More specifically, the lower guide assemblies are four groups and are uniformly distributed around the moving coil.
A method for adjusting the distance between the moving coil and the cylinder body of a vibration table applies the magnetic guide structure on the vibration table, and the magnetic guide structure comprises at least three groups,
s1, position acquisition, namely acquiring the distance between the moving coil and the cylinder body through a displacement sensor and feeding the distance back to the controller;
s2, processing signals, comparing the collected distance signals in multiple directions by the controller, and calculating to obtain difference values in all directions, and calculating to obtain the current in the electromagnetic coil in all directions by the controller according to the difference values;
and S3, adjusting the position, wherein the controller outputs a current value to the electromagnetic coil to adjust the position of the moving coil so that the moving coil is positioned at the center position.
More specifically, the displacement sensor collects distance information once, and the adjustment method is executed once.
The invention has the beneficial effects that: the electromagnetic coil and the armature are matched to generate a gap between the electromagnetic coil and the armature, and the moving coil moves up and down in the gap, so that the purpose of no friction is achieved, the defects caused by using a guide wheel guide mechanism and a hydraulic static pressure guide mechanism are overcome, the problem of large low-frequency distortion of the moving coil of the vibrating table is solved, the problems of large abrasion and large loss of a moving coil guide part can be reduced, and the problem of resonant abnormal sound of the low frequency of the guide part in use can be solved.
Drawings
FIG. 1 is a schematic diagram of a first prior art configuration;
FIG. 2 is a schematic diagram of a second prior art configuration;
FIG. 3 is a schematic structural view of the present invention;
FIG. 4 is a schematic structural view of the upper guide assembly of the present invention;
FIG. 5 is a schematic structural view of the lower guide assembly of the present invention;
FIG. 6 is a schematic diagram of the tuning method of the present invention.
In the figure: 1. a cylinder block support; 2. a cylinder body; 3. moving coils; 4. a magnet; 5. a winding; 6. an upper guide assembly; 7. a lower guide assembly; 61. a guide seat; 62. an electromagnetic coil; 63. an armature; 64. a displacement sensor; 8. a guide wheel guide mechanism; 9. and a hydraulic static pressure guide mechanism.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 3, the vibration table comprises a cylinder body support 1 fixed on the ground, a cylinder body 2 arranged on the cylinder body support 1, a moving coil 3 positioned in the cylinder body 2, a magnet 4 arranged in the cylinder body 2, and a winding 5 wound on the moving coil 3, wherein the winding 5 on the moving coil 3 is electrified to generate a magnetic field, the action of the magnetic field and the magnetic field of the magnet enables the moving coil 3 to vibrate up and down at high frequency, in order to ensure the stable movement of the moving coil 3, an upper guide component 6 is arranged between the upper part of the moving coil 3 and the cylinder body 2, a lower guide component 7 is arranged between the bottom of the moving coil 3 and the cylinder body 2, the upper guide component and the lower guide component are both formed by combining magnetic guide structures, in the scheme, the upper guide assembly is composed of 3 groups of magnetic guide structures, and the 3 groups of magnetic guide structures are uniformly distributed around the moving coil and form an angle of 120 degrees between every two magnetic guide structures; the lower guide assembly is composed of 4 groups of magnetic guide structures, the 4 groups of magnetic guide structures are uniformly distributed around the moving coil 3, and an angle of 90 degrees is formed between every two magnetic guide structures; the vibration table can be set by selecting different numbers of magnetic guide structures according to the size of the vibration table and the weight of the moving coil 3.
As shown in fig. 4 and 5, the magnetic guiding structure includes an armature 63 and an electromagnetic coil 62 engaged with the armature 63, in this solution, the armature 63 is fixed on the moving coil 3, the electromagnetic coil 62 is fixed on the cylinder 2 through a guiding seat 61, the guiding seat 61 can finely adjust the distance between two adjacent electromagnetic coils 62, a magnetic field is formed by electrifying in the electromagnetic coil 62, a gap is formed between the electromagnetic coil 62 and the armature 63, the distances between each group of electromagnetic coils 62 and the armature 63 in the upper guiding assembly 6 are equal, and the distances between each group of electromagnetic coils 62 and the armature 63 in the lower guiding assembly 7 are equal, so that the stability of the up-and-down movement of the moving coil 3 can be ensured.
When the distance between the electromagnetic coil 62 and the armature 63 is not equal any more, the motion of the moving coil 3 is not stable any more, and at this time, the position of the moving coil 3 needs to be adjusted, so a displacement sensor 64 for detecting the distance between the moving coil 3 and the cylinder body 2 is arranged on the cylinder body 2, the displacement sensor 64 is arranged on the cylinder body 2 through a fixed seat, a controller is arranged on the vibration table, the change of the distance between the moving coil 3 and the cylinder body 2 is monitored in real time through the displacement sensor 64, and the controller receives a signal of the displacement sensor 64 and controls the current of the electromagnetic coil 62. The displacement sensor 64 is a differential transformer type displacement sensor, and the displacement sensor 64 has the following advantages: 1. micro displacement is taken as a measuring object; 2. the sensitivity is high, and the anti-interference capability is strong; 3. the displacement is linear with the output.
As shown in fig. 6 by the change in distance monitored by the displacement sensor 64, the controller adjusts the current output by,
s1, acquiring positions, acquiring the distance between the moving coil 3 and the cylinder body 2 through the displacement sensor 64 and feeding back the distance to the controller, wherein the 3 displacement sensors 64 of the upper guide assembly 6 detect the distances in 3 horizontal directions; the 4 displacement sensors 64 of the lower guide assembly 7 detect the distances in the 4 horizontal directions.
S2, processing signals, comparing the acquired distances in 3 horizontal directions of the upper guide assembly 6 by the controller, and calculating to obtain difference values between the acquired distances, calculating by the controller according to the difference values to obtain the force required in each direction, and calculating according to the force in each direction to obtain the current required in the electromagnetic coil 62 in each direction; the calculation of the lower guide assembly 7 in the 4 horizontal directions is identical to that of the upper guide assembly 6.
S3, position adjustment, namely, the controller outputs a current value, and the electromagnetic coil 62 adjusts the position of the moving coil 3 to enable the moving coil 3 to be positioned at the central position; the adjustment of the centering of the position of the moving coil 3 is achieved by controlling the magnitude of the force in each direction by increasing or decreasing the current value in the corresponding electromagnetic coil 62.
The displacement sensor 64 collects distance information in real time, and the steps are performed once every time the distance information is collected to adjust the position of the moving coil 3 until the position is centered, and the same force is generated between each electromagnetic coil 62 and the armature 63 so that the moving coil 3 is located at the central position.
In conclusion, a gap is formed between the electromagnetic coil 62 and the armature 63 through the matching of the electromagnetic coil 62 and the armature 63, and the moving coil 3 moves up and down in the gap, so that the purpose of no friction is achieved, the defects caused by using the guide wheel guide mechanism 8 and the hydrostatic pressure guide mechanism 9 are overcome, the problem of large low-frequency distortion of the moving coil 3 of the vibrating table is solved, the problems of large abrasion and large loss of a guide part of the moving coil 3 can be reduced, and the problem of resonant abnormal sound of the guide part at low frequency in use can be solved; the distance is acquired through the displacement sensor 64, and meanwhile, the controller compares and calculates the distance and outputs corresponding current to adjust the centering of the moving coil 3, so that automatic real-time adjustment is realized, and the motion stability of the moving coil 3 is improved.
It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (9)
1. A magnetic guide structure of a moving coil is arranged between the moving coil (3) on a vibration table and a cylinder body (2), and is characterized by comprising an armature (63) and an electromagnetic coil (62) matched with the armature (63), wherein a magnetic field is formed by electrifying in the electromagnetic coil (62), and a gap is formed between the electromagnetic coil (62) and the armature (63).
2. The magnetic guide structure of the moving coil according to claim 1, characterized in that a displacement sensor (64) for detecting the distance between the moving coil (3) and the cylinder (2) is provided on the cylinder (2), and a controller is provided on the vibration table, the controller receiving the signal of the displacement sensor (64) and controlling the current of the electromagnetic coil (62).
3. The magnetic guide structure of a moving coil according to claim 2, characterized in that the displacement sensor (64) is a differential transformer type displacement sensor.
4. A vibration table comprises a cylinder body support (1) fixed on the ground, a cylinder body (2) arranged on the cylinder body support (1), a moving coil (3) positioned in the cylinder body (2), a magnet (4) arranged in the cylinder body (2) and a winding (5) wound on the moving coil (3), and is characterized in that the magnetic guide structure of any one of claims 1 to 3 is adopted between the upper part of the moving coil (3) and the cylinder body (2) as an upper guide assembly (6), and the magnetic guide structure of any one of claims 1 to 3 is adopted between the bottom of the moving coil (3) and the cylinder body (2) as a lower guide assembly (7).
5. Vibrating table according to claim 4, characterised in that said upper guide assemblies (6) are at least three groups and are uniformly distributed around the moving coil (3).
6. Vibrating table according to claim 4, characterised in that said lower guide assemblies (7) are at least three groups and are uniformly distributed around the moving coil (3).
7. Vibrating table according to claim 4, characterised in that the lower guide assemblies (7) are in four groups and are evenly distributed around the moving coil (3).
8. A method for adjusting the distance between a moving coil and a cylinder body of a vibration table, wherein the magnetic guide structure of claim 2 is applied to the vibration table, and the magnetic guide structures are at least three groups,
s1, acquiring the position, acquiring the distance between the moving coil (3) and the cylinder body (2) through the displacement sensor (64) and feeding back the distance to the controller;
s2, processing signals, comparing the collected distance signals in multiple directions by the controller, and calculating to obtain difference values in all directions, and calculating to obtain the current magnitude in the electromagnetic coil (62) in all directions by the controller according to the difference values;
and S3, position adjustment, wherein the controller outputs a current value to the electromagnetic coil (62) to adjust the position of the moving coil (3) so that the moving coil (3) is positioned at the central position.
9. The method for adjusting the distance between the moving coil and the cylinder of the vibrating table as claimed in claim 8, wherein the distance sensor (64) collects distance information once, and the adjusting method is performed once.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010621478.1A CN111649892A (en) | 2020-06-30 | 2020-06-30 | Magnetic guide structure of moving coil, vibrating table with magnetic guide structure and adjusting method |
| PCT/CN2020/114784 WO2022000788A1 (en) | 2020-06-30 | 2020-09-11 | Magnetic guide structure of moving coil, vibration table having magnetic guide structure, and adjustment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010621478.1A CN111649892A (en) | 2020-06-30 | 2020-06-30 | Magnetic guide structure of moving coil, vibrating table with magnetic guide structure and adjusting method |
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| CN111649892A true CN111649892A (en) | 2020-09-11 |
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| CN202010621478.1A Pending CN111649892A (en) | 2020-06-30 | 2020-06-30 | Magnetic guide structure of moving coil, vibrating table with magnetic guide structure and adjusting method |
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| CN (1) | CN111649892A (en) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113465852A (en) * | 2021-07-05 | 2021-10-01 | 苏州苏试试验集团股份有限公司 | Dynamic centering method of vibration system under vibration condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004219307A (en) * | 2003-01-16 | 2004-08-05 | Akashi Corp | Vibration testing machine |
| CN104483084A (en) * | 2014-12-08 | 2015-04-01 | 苏州苏试试验仪器股份有限公司 | Lower guide support device for electrodynamic vibration table |
| CN105149199B (en) * | 2015-07-14 | 2018-05-15 | 北京卫星环境工程研究所 | The electromagnetic vibration generator system used under spacecraft dynamics apocarpy |
| CN207318039U (en) * | 2017-10-26 | 2018-05-04 | 苏州速尼科测试设备有限公司 | Shake table guider |
| CN207540751U (en) * | 2017-11-16 | 2018-06-26 | 苏州苏试试验集团股份有限公司 | Support and lower guider on a kind of moving-coil of electric vibration table |
| CN109211506A (en) * | 2018-10-30 | 2019-01-15 | 脉创测控装备科技（苏州）有限公司 | Testing equipment, center-zero offset control device and control method |
| CN210799741U (en) * | 2019-07-01 | 2020-06-19 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Self-aligning magnetic suspension bearing system and generator |
| CN212206530U (en) * | 2020-06-30 | 2020-12-22 | 苏州苏试试验集团股份有限公司 | Magnetic guide structure of moving coil and vibrating table with same |
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- 2020-06-30 CN CN202010621478.1A patent/CN111649892A/en active Pending
- 2020-09-11 WO PCT/CN2020/114784 patent/WO2022000788A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113465852A (en) * | 2021-07-05 | 2021-10-01 | 苏州苏试试验集团股份有限公司 | Dynamic centering method of vibration system under vibration condition |
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| WO2022000788A1 (en) | 2022-01-06 |
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