CN108711483B - Coil with variable spacing - Google Patents
Coil with variable spacing Download PDFInfo
- Publication number
- CN108711483B CN108711483B CN201810454598.XA CN201810454598A CN108711483B CN 108711483 B CN108711483 B CN 108711483B CN 201810454598 A CN201810454598 A CN 201810454598A CN 108711483 B CN108711483 B CN 108711483B
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- China
- Prior art keywords
- module
- welding
- coil
- modules
- rods
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- 238000003466 welding Methods 0.000 claims abstract description 53
- 230000005284 excitation Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 230000005291 magnetic effect Effects 0.000 description 4
- BLRBOMBBUUGKFU-SREVYHEPSA-N (z)-4-[[4-(4-chlorophenyl)-5-(2-methoxy-2-oxoethyl)-1,3-thiazol-2-yl]amino]-4-oxobut-2-enoic acid Chemical compound S1C(NC(=O)\C=C/C(O)=O)=NC(C=2C=CC(Cl)=CC=2)=C1CC(=O)OC BLRBOMBBUUGKFU-SREVYHEPSA-N 0.000 description 3
- 235000019687 Lamb Nutrition 0.000 description 3
- 238000009659 non-destructive testing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/04—Arrangements of electric connections to coils, e.g. leads
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention discloses a coil with a variable distance, which is formed by mutually welding a first module, a second module, a third module and a fourth module, wherein two ends of the second module are respectively welded with welding rods of the first module and the third module through welding pads, two ends of the fourth module are respectively welded with welding rods of the two third modules which are spaced apart through welding pads, the second module is connected with the fourth module through the third module, the first module and the third module are mutually arranged in parallel, the second module and the fourth module are mutually arranged in parallel, and the first module and the second module are mutually perpendicular. According to the ultrasonic excitation frequency or the change of the thickness of the detected workpiece, the distance between the modules is adjusted, and ultrasonic waves with specific wavelengths are excited through assembly welding. The invention has simple structure, is easy to weld, can rapidly obtain the reverse coil with different intervals, and meets the requirement of experiments.
Description
Technical field:
the invention relates to a coil with a variable distance, and belongs to the technical field of electromagnetic ultrasonic nondestructive testing.
The background technology is as follows:
an electromagnetic ultrasonic transducer (Electromagnetic acoustic transducer, EMAT for short) is a novel ultrasonic transmitting and receiving device. Electromagnetic ultrasonic nondestructive detection has the advantages of non-contact, no need of coupling, suitability for high-temperature detection, easiness in exciting various ultrasonic waveforms and the like, and is increasingly applied to various detections. The structure of the EMAT is generally composed of a magnet, a high-frequency coil and a workpiece to be measured. The magnet is used for providing an externally applied magnetic field and can be a permanent magnet or an electromagnet; the high-frequency coil is used for generating a high-frequency excitation magnetic field; the workpiece to be measured must be electrically conductive or ferromagnetic. The coil is placed under a horizontal or vertical magnetic field, high-frequency alternating current is introduced into the coil, and eddy currents are generated in the measured workpiece below the transducer. Under the action of the externally applied magnetic field, the eddy current in the measured workpiece can generate high-frequency vibration under the action of mechanical force, so that an ultrasonic wave source is formed. The high-frequency coil of the electromagnetic ultrasonic transducer is provided with a spiral coil and a return-turn coil, and for the spiral coil, the lorentz force direction is perpendicular to the tangential direction of the coil, so that energy dispersion and poor directivity can be caused, and the common EMAT coil for exciting lamb waves is mainly provided with the return-turn coil. According to the principle of constructive interference, ultrasonic waves are superimposed by utilizing the space periodicity of coils, and when the coil spacing of the folded coil is equal to one half wavelength of a lamb wave, signals of a lamb wave mode are enhanced. While signals of other modes are suppressed. In electromagnetic ultrasonic nondestructive testing experiments, the excitation frequency of ultrasonic waves or the thickness of a tested workpiece are often changed to obtain different experimental data, but for transmitting and receiving coils, the distance between the coils is fixed, the numerical value of the excitation frequency of ultrasonic waves and the thickness of the tested workpiece corresponds to the distance value of one coil, and a PCB board is manufactured according to the distance value, so that the design of the coil with the variable distance, of which the distance can be set according to experimental requirements, is extremely inconvenient, and the electromagnetic ultrasonic nondestructive testing experiments are more rapid and convenient.
The invention comprises the following steps:
the invention aims to solve the problems in the prior art and provides a coil with a variable spacing, which is suitable for electromagnetic ultrasonic nondestructive detection, and can be obtained by welding according to the requirement of the required coil spacing, so that the coil spacing of a high-frequency coil is simple and quick, and a detector does not need to be changed due to the change of ultrasonic excitation frequency or the thickness of a measured workpiece.
The invention adopts the technical scheme that: the utility model provides a coil of variable interval, is formed by first module, second module, third module and fourth module mutual welding, the welding rod looks welding of second module's both ends with first module and third module through the pad respectively, the welding rod looks welding of the third module that two intervals are separated through the pad respectively at the both ends of fourth module, and the second module passes through the third module and links to each other with the fourth module, and first module and the mutual parallel arrangement of third module, the mutual parallel arrangement of second module and fourth module, first module and the mutual perpendicular setting of second module.
Further, the number of the first modules is one, the number of the second modules is two, the number of the third modules is seven, and the number of the fourth modules is six.
Further, the first module is provided with 4n welding rods, each of the left and right ends is provided with 2n welding rods, the welding rods at the left and right ends are connected through a wire, and n is the number of layers of the coil.
Further, two ends of the second module are respectively provided with 2n bonding pads, the centers of the bonding pads are provided with through holes for welding with the first module and the third module, and the two ends are symmetrical about the center.
Further, 2n welding rods are arranged on the third module, and scale marks are marked above the welding rods.
Further, the positions and the number of the bonding pads at the two ends of the fourth module are identical to those of the second module, and the whole length of the fourth module is smaller than that of the second module.
The invention has the following beneficial effects: according to the invention, the distance between the coil modules is adjusted according to the ultrasonic excitation frequency or the thickness change of the detected workpiece, and the ultrasonic wave with specific wavelength is excited through assembly welding. The invention has simple structure, is easy to weld, can rapidly obtain the reverse coil with different intervals, and meets the requirement of experiments.
Description of the drawings:
fig. 1 is a block diagram of the overall structure of the present invention.
Fig. 2 is a block diagram of the present invention when the number of coil layers is 2.
Fig. 3 is a diagram showing positions of bonding pads at two ends of a second module and a fourth module corresponding to the present invention when the number of coil layers is 2.
Fig. 4 is a circuit diagram of an overall PCB corresponding to the present invention when the number of coil layers is 2.
The specific embodiment is as follows:
the invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the coil with variable spacing according to the present invention is formed by welding a first module 1, a second module 2, a third module 3 and a fourth module 4 to each other, wherein the number of the first modules 1 in the whole coil is one, the number of the second modules 2 is two, the number of the third modules 3 is seven, and the number of the fourth modules 4 is six. The two ends of the second module 2 are respectively welded with welding rods of the first module 1 and the third module 3 through bonding pads, and the two ends of the fourth module 4 are respectively welded with welding rods of the two third modules 3 which are spaced apart through bonding pads. Wherein the first module 1 and the third module 3 are arranged in parallel, the second module 2 and the fourth module 4 are arranged in parallel, and the first module 1 and the second module 2 are arranged perpendicular to each other. The distance between the coils can be adjusted by adjusting the welding distance between the second module 2 and the fourth module 4 and the welding distance between the fourth module 4 and the fourth module 4, so that the coils meeting experimental requirements are obtained. One end of the second module 2 is welded on the welding rod of the first module 1, and the other end of the second module 2 is welded on the welding rod of the third module 3; two ends of the fourth module 4 are respectively welded on two different third modules 3; the second module 2 is connected to the fourth module 4 via the third module 3.
The first module 1 of the invention is provided with 4n welding rods, each of the left and right ends is provided with 2n welding rods, the welding rods at the left and right ends are connected through a wire, n is the number of layers of the coil, such as: when the number of the coil layers is 2, 4 welding rods are respectively arranged at the two ends of the first module 1.
Two ends of the second module 2 are respectively provided with 2n bonding pads, the centers of the bonding pads are provided with through holes for welding with the first module 1 and the third module 3, and the two ends are symmetrical about the center. The number of the bonding pads is twice as many as the number of the layers of the coil, and the bonding pads can be in a semi-stamp hole structure so as to facilitate welding.
The third module 3 is provided with 2n welding rods, and graduation lines are marked above the welding rods and used for adjusting the distance.
The positions and the number of the bonding pads at the two ends of the fourth module 4 are identical to those of the second module 2, but the whole length of the fourth module 4 is smaller than that of the second module 2.
The coil of the design can be designed into a single-layer coil or a multi-layer coil according to experimental requirements.
In the invention, the second module 2 and the fourth module 4 are working coils excited by ultrasonic waves, and the third module 3 is a connecting coil. In operation, the third module 3 is above the second module 2 and the fourth module 4, so that the eddy current generated in the test piece by the current passing through the third module 3 is smaller, and a better signal-to-noise ratio can be obtained.
Referring to fig. 2 and 3, when the number of layers of the coil is 2, the corresponding modules and the overall circuit diagrams of the coil are shown in fig. 2 and 3.
As shown in fig. 2, when the number of coil layers is 2, the number of pads at the left and right ends of the second module 2 and the fourth module 4 is 4, 8 welding rods are provided on the first module 1, 4 welding rods are provided on the left and right sides, and 4 welding rods are provided on the third module 3.
When the number of the coil layers is 2, as shown in fig. 3, the bonding pads at both ends of the second module 2 and the fourth module 4 are positioned as shown in the figure, the first bonding pad 5 is a bonding pad connected to the upper layer coil, and the second bonding pad 6 is a bonding pad connected to the lower layer coil. By assembling and welding the first module 1, the second module 2, the third module 3 and the fourth module 4, an overall circuit diagram of the invention corresponding to the case where the coil is 2 layers is obtained, as shown in fig. 4.
The foregoing is merely a preferred embodiment of the invention, and it should be noted that modifications could be made by those skilled in the art without departing from the principles of the invention, which modifications would also be considered to be within the scope of the invention.
Claims (1)
1. A variable spacing coil, characterized by: the welding rod welding device is formed by mutually welding a first module (1), a second module (2), a third module (3) and a fourth module (4), wherein two ends of the second module (2) are respectively welded with welding rods of the first module (1) and the third module (3) through welding pads, two ends of the fourth module (4) are respectively welded with welding rods of the third module (3) which are separated from each other through welding pads, the second module (2) is connected with the fourth module (4) through the third module (3), the first module (1) and the third module (3) are mutually parallel, the second module (2) and the fourth module (4) are mutually parallel, and the first module (1) and the second module (2) are mutually perpendicular;
the number of the first modules (1) is one, the number of the second modules (2) is two, the number of the third modules (3) is seven, and the number of the fourth modules (4) is six;
the first module (1) is provided with 4n welding rods, each of the left and right ends is provided with 2n welding rods, the welding rods at the left and right ends are connected through a wire, and n is the number of layers of the coil;
two ends of the second module (2) are respectively provided with 2n bonding pads, the centers of the bonding pads are provided with through holes for welding with the first module (1) and the third module (3), and the two ends are symmetrical about the center;
2n welding rods are arranged on the third module (3), and scale marks are marked on the welding rods;
the positions and the number of the bonding pads at the two ends of the fourth module (4) are completely the same as those of the second module (2), and the whole length of the fourth module (4) is smaller than that of the second module (2);
the distance between the coils is adjusted by adjusting the welding distance between the second module (2) and the fourth module (4) and the welding distance between the fourth module (4) and the fourth module (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810454598.XA CN108711483B (en) | 2018-05-14 | 2018-05-14 | Coil with variable spacing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810454598.XA CN108711483B (en) | 2018-05-14 | 2018-05-14 | Coil with variable spacing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108711483A CN108711483A (en) | 2018-10-26 |
| CN108711483B true CN108711483B (en) | 2024-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810454598.XA Active CN108711483B (en) | 2018-05-14 | 2018-05-14 | Coil with variable spacing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108711483B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1378306A (en) * | 2001-04-02 | 2002-11-06 | 明碁电通股份有限公司 | Double frequency function curved antenna |
| CN1635637A (en) * | 2003-12-29 | 2005-07-06 | 北京大学 | Three dimensional integrated inductance and manufacturing method thereof |
| CN101257141A (en) * | 2007-10-30 | 2008-09-03 | 李伟基 | Coupled type zig-zag type monopolar antenna covered by conductive layer |
| CN106416436A (en) * | 2014-05-08 | 2017-02-15 | 奥斯兰姆施尔凡尼亚公司 | Techniques for adhering surface mount devices to a flexible substrate |
| CN209133293U (en) * | 2018-05-14 | 2019-07-19 | 南京航空航天大学 | A kind of coil of variable spacing |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6115147B2 (en) * | 2013-01-22 | 2017-04-19 | 富士通株式会社 | Wiring board and design method thereof |
| US11501908B2 (en) * | 2016-10-04 | 2022-11-15 | Nanohenry, Inc. | Miniature inductors and related circuit components and methods of making same |
-
2018
- 2018-05-14 CN CN201810454598.XA patent/CN108711483B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1378306A (en) * | 2001-04-02 | 2002-11-06 | 明碁电通股份有限公司 | Double frequency function curved antenna |
| CN1635637A (en) * | 2003-12-29 | 2005-07-06 | 北京大学 | Three dimensional integrated inductance and manufacturing method thereof |
| CN101257141A (en) * | 2007-10-30 | 2008-09-03 | 李伟基 | Coupled type zig-zag type monopolar antenna covered by conductive layer |
| CN106416436A (en) * | 2014-05-08 | 2017-02-15 | 奥斯兰姆施尔凡尼亚公司 | Techniques for adhering surface mount devices to a flexible substrate |
| CN209133293U (en) * | 2018-05-14 | 2019-07-19 | 南京航空航天大学 | A kind of coil of variable spacing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108711483A (en) | 2018-10-26 |
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