CN113484807A - Nested annular three-axis fluxgate sensor detection probe - Google Patents
Nested annular three-axis fluxgate sensor detection probe Download PDFInfo
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- CN113484807A CN113484807A CN202110736721.9A CN202110736721A CN113484807A CN 113484807 A CN113484807 A CN 113484807A CN 202110736721 A CN202110736721 A CN 202110736721A CN 113484807 A CN113484807 A CN 113484807A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/04—Measuring direction or magnitude of magnetic fields or magnetic flux using the flux-gate principle
Abstract
The invention discloses a nested annular three-axis fluxgate sensor detection probe.A winding framework of an annular excitation winding comprises three annular frameworks which are mutually orthogonally arranged along three axis directions of a three-dimensional coordinate system XYZ, permalloy magnetic cores are respectively wound on the three frameworks, and the three annular frameworks are mutually inserted; an excitation winding is wound on the outer layer annular framework; the square induction winding framework comprises three square frameworks which are mutually orthogonally arranged along three axial directions of a three-dimensional coordinate system XYZ, and the three square frameworks and the annular excitation winding framework are mutually inserted; the annular excitation winding framework and the square induction winding framework are coaxial in three axes, and the annular framework is nested in the square framework; an induction winding is wound on the outer square framework. The special structure of the annular framework can uniformly distribute the internal stress of the magnetic core, and the magnetic circuit of the annular magnetic core can remove part of regional noise. The grooves are designed in each single framework for splicing and nesting, and compared with three independent single shafts, the angle deviation of installation is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of fluxgate magnetic field detection, and relates to a nested annular three-axis fluxgate sensor detection probe.
Background
The fluxgate sensor is a transformer type device reconstructed according to the electromagnetic induction phenomenon, only the transformer effect is used for modulating the external measured magnetic field, the basic principle can be explained by Faraday's law of electromagnetic induction, and the fluxgate sensor measures the weak magnetic field by utilizing the nonlinear relation between the magnetic induction intensity and the magnetic field intensity of a high-permeability magnetic core in the measured magnetic field under the saturated excitation of an alternating magnetic field. This physical phenomenon appears to the measured ambient magnetic field as a "gate" through which the corresponding magnetic flux is modulated and generates an induced electromotive force.
The existing detection probe based on the fluxgate sensor is divided into a single-rod type, a double-rod type, a ring type and the like. The fluxgate signal output by the induction coil of the single-rod fluxgate probe is very weak and the noise signal of odd harmonic waves is very large; the dual-bar fluxgate probe can effectively reduce the noises; however, the magnetic circuit of the exciting coil of the annular fluxgate probe is closed, the magnetic circuit of the induction coil is unique, the symmetry and the structural balance are good, and the stress borne by the magnetic core is uniformly distributed, so that compared with single-rod type and double-rod type fluxgate probes, the noise of the annular fluxgate probe is smaller, and therefore the three-axis annular fluxgate probe is designed to be used for accurately detecting the three-dimensional space magnetic field.
At present, detection probes adopted by a fluxgate magnetic field are mainly single-axis and double-axis, but some cases of the detection probes of a three-axis fluxgate sensor exist, for example, two invention patents with patent numbers of CN106405453A and CN106569154A are named as "a three-axis fluxgate sensor". The common point of the two patents and the invention is that the three-axis fluxgate probe used for detecting the magnetic field is composed of three single-axis fluxgate probes, but the two patents have the disadvantage that the three single-axis fluxgate probes are manually installed on the same plane or the same cube, which causes great human error in the three-axis magnetic field detection of the related invention.
For example, patent No. CN102928885A entitled "a spherical feedback three-component fluxgate magnetic gradient full-tensor probe" and patent No. CN107271933A entitled "a spherical three-axis fluxgate sensor" both have the common point that the three-axis fluxgate probe for detecting a magnetic field is a combined body, but both have the disadvantages that the windings of the three-axis fluxgate probe are wound in a plurality of grooves formed on the surface of a sphere, and because a plurality of turns of coils are wound in each groove, inter-turn and cable bypass capacitances exist, and the winding of the coils is not ideal, such as a stacked and flat type, which makes the induced pulse acquired by the three-axis detection windings unsatisfactory, and reduces the accuracy of magnetic measurement.
Comparing the above patents, it can be known that there is a need for a fluxgate magnetic field detection technique with a triaxial ring fluxgate probe that enables lower noise, more accurate detection precision, smaller size, convenient operation and convenient adjustment to solve the above problems.
Disclosure of Invention
The invention aims to provide a detection probe of a three-axis fluxgate sensor, which can reduce the noise of a magnetic core and improve the detection stability and accuracy; the annular magnetic core exciting coil used by the invention can ensure that the stress borne by the magnetic core is uniformly distributed, and the magnetic circuit of the exciting coil is closed, thereby greatly reducing the noise problem generated by the exciting coil; meanwhile, the detection probe is easy to manufacture, convenient to operate and adjust, the coil is uniformly wound and is not limited by groove separation, and the generated magnetic field is simpler and more uniform.
The purpose of the invention is realized by the following technical scheme:
a nested annular three-axis fluxgate sensor detection probe comprises an excitation coil part and an induction coil part, wherein the excitation coil comprises a permalloy thin strip-shaped magnetic core, an annular excitation winding framework and an excitation winding, and the induction coil comprises a square induction winding framework and an induction winding;
the annular excitation winding framework comprises an outer annular framework, a middle annular framework and an inner annular framework, the three annular frameworks are respectively installed in an orthogonal mode along the three directions of an X axis, a Y axis and a Z axis of a three-dimensional coordinate system, the outer ring of each annular framework is respectively provided with a square inserting bulge in the axial direction, and meanwhile the outer annular framework and the middle annular framework are respectively provided with square grooves in the corresponding positions of the inner rings thereof and used for the mutual nesting installation of the inner annular framework and the outer annular framework; the peripheral grooves of the outer layer annular framework, the middle layer annular framework and the inner layer annular framework are respectively jointed with a permalloy thin strip-shaped magnetic core to form an annular framework with the magnetic core; the excitation winding is uniformly wound on the outer layer annular framework to form an excitation coil;
the square induction winding framework comprises a middle-layer square framework and an inner-layer square framework, the three square frameworks are respectively installed in an orthogonal mode along the three directions of an X axis, a Y axis and a Z axis of a three-dimensional coordinate system, and meanwhile square grooves are formed in corresponding positions of the inner sides of the outer-layer square framework and the middle-layer square framework and used for mutually nesting and installing the inner square framework and the outer square framework; the annular excitation winding framework and the square induction winding framework are coaxial in three axes; a square groove is arranged at a corresponding position on the inner side of the inner layer square framework and is used for being mutually nested and installed with a square embedding bulge arranged on the outer circular ring of the outer layer annular framework; the induction winding is uniformly wound in the groove at the periphery of the outer square framework to form the induction coil.
Furthermore, the diameter of the outer layer annular framework is 20 mm-30 mm, the length and the width of the axial inserting convex part are 1 mm-5 mm, and the thickness is 0.5 mm-1 mm; the diameter of the middle layer annular framework is 10 mm-20 mm, the length and width of the axial inserting convex part are 1 mm-5 mm, and the thickness is 0.5 mm-1 mm; the diameter of the inner layer annular framework is 5 mm-10 mm; all the frameworks can be 3D printed by photosensitive resin materials and also can be made of ceramic fiber materials.
Furthermore, four clamping grooves with the width of 0.5-1 mm and the length of 3.5-7 mm are reserved at the inner circular ring of the outer layer annular framework and the inner circular ring of the middle layer annular framework respectively and are used for fixing the next-stage annular framework.
Furthermore, the magnetic core is a permalloy magnetic strip with the width of 3 mm-10 mm and the thickness of 0.1 mm-0.3 mm, and the magnetic strip is uniformly wound around the outer grooves of the three annular frameworks for two circles to serve as an exciting coil magnetic core of the detection probe.
Furthermore, the inner side of the outer layer square framework is a square with the length and width of 30-35 mm; the inner side of the middle layer square framework is a rectangle with the length and width of 35 mm-40 mm; the inner side of the outer layer square framework is a rectangle with the length and width of 40 mm-45 mm; all the frameworks can be 3D printed by photosensitive resin materials and also can be made of ceramic fiber materials.
Four clamping grooves with the width of 1-2 mm, the length of 10-20 mm and the thickness of 0.5-1 mm are reserved on the inner sides of the outer layer square framework, the middle layer square framework and the inner layer square framework respectively and used for fixing the next level square framework.
Furthermore, the induction winding or the excitation winding is made of enameled copper wires, and 200-800 turns of the enameled copper wires are wound to form an induction coil or an excitation coil.
The excitation circuit is formed by mutually orthogonalizing three annular fluxgate coils, so that the noise of magnetic field detection is reduced, and the detection precision is improved; each coil is wound uniformly, so that the magnetic field generated by the coil has higher uniformity, and the accuracy and the stability of the detection of the probe are improved.
Drawings
FIG. 1 is a three-dimensional block diagram of the present invention;
FIG. 2 is a view of the present invention with the front outer box cut away;
FIG. 3 is an exploded view of the present invention;
FIG. 4 is a block skeletal view of a tape wound coil in accordance with the present invention;
fig. 5 is a view of the bobbin of the endless belt with the wound coil of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1 to 5, the present invention includes an excitation coil portion and an induction coil portion, wherein the excitation coil portion includes a permalloy thin strip-shaped magnetic core 3, an annular excitation bobbin 2 and an excitation winding 7, the induction coil portion includes a square induction bobbin 1 and an induction winding 6, the excitation winding 7 is uniformly wound through a circular hole in the annular bobbin between the circular holes 7, and the induction winding 6 is uniformly wound in a groove in the periphery of the square bobbin.
As a further aspect of the present invention, as shown in fig. 4 and 5, in order to make the magnetic field generated by the excitation signal and the induced magnetic field in the same horizontal direction, the induction coil is formed by winding a wire at a winding groove outside the induction bobbin 1, and the excitation coil is formed by winding a wire through an outer layer annular bobbin 21 of the annular excitation bobbin 2.
As a further aspect of the present invention, as shown in fig. 3, the outer layer annular skeleton 21 has an inner circle diameter of 20mm and an outer circle diameter of 24 mm; the axial inserting convex part is 2mm long, 1.5mm wide and 1mm thick; the diameter of the inner circle of the middle layer annular framework 22 is 14mm, and the diameter of the outer circle is 18 mm; the axial inserting bulge 5 is 2mm long, 1.1mm wide and 1mm thick; the inner circle diameter of the inner layer annular framework 23 is 8mm, and the outer circle diameter is 12 mm; all the skeletons can be 3D printed by photosensitive resin materials.
As a further scheme of the present invention, as shown in fig. 3, the inner side of the outer layer square skeleton 11 is a square with a length and a width of 37mm, and the outer side is a square with a length and a width of 42 mm; the inner side of the middle layer square framework 12 is a square with the length and width of 31mm, and the outer side is a rectangle with the length and width of 38mm x 36 mm; the inner side of the inner layer square framework 13 is a square with the length and width of 26mm, and the outer side of the inner layer square framework is a rectangle with the length and width of 32mm x 30 mm; all the skeletons can be 3D printed by photosensitive resin materials.
As a further scheme of the present invention, as shown in fig. 3, all the frameworks wound with the magnetic core and the conducting wire are sequentially inserted, the protruding portion of the inner annular framework 23 is aligned with the groove of the intermediate annular framework 22 for insertion, then the protruding portion of the intermediate annular framework 22 is aligned with the groove of the outer annular framework 21 for insertion, then the protruding portion of the outer annular framework 21 is aligned with the groove of the inner square framework 13 for insertion, then the long side of the inner square framework 13 is aligned with the groove of the intermediate square framework 12 for insertion, and finally the long side of the intermediate square framework 12 is aligned with the groove of the outer square framework 11 for insertion, so as to obtain the assembly of the triaxial annular fluxgate sensor probe.
As a further scheme of the present invention, as shown in fig. 1 and fig. 2, each layer of inserted frameworks is inserted into the middle of the groove of the outer layer of frameworks, so that the magnetic field directions of the outer square frameworks and the inner annular frameworks are in one-to-one correspondence.
The working principle and the process of the invention are as follows:
the exciting coil wound on the annular framework is excited by square wave voltage with a certain frequency, so that the magnetic permeability of the permalloy magnetic core is in a magnetic saturation state under an alternating magnetic field, and the weak magnetic field is measured by the nonlinear relation between the magnetic induction intensity and the magnetic field intensity. This physical phenomenon appears to the measured ambient magnetic field as a "gate" through which the corresponding magnetic flux is modulated and generates an induced electromotive force. As shown in fig. 1, the inner annular frame 23 and the outer square frame 11 constitute a single-axis fluxgate sensor probe for detecting the X-axis direction, the outer annular frame 21 and the middle square frame 12 constitute a single-axis fluxgate sensor probe for detecting the Y-axis direction, and the middle annular frame 22 and the inner square frame 13 constitute a single-axis fluxgate sensor probe for detecting the Z-axis direction; the three groups of probes are subjected to software programming processing of corresponding algorithms, and the size and the direction of the environmental magnetic field can be accurately detected.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes and modifications can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (7)
1. The utility model provides a nested formula annular triaxial fluxgate sensor test probe, includes excitation coil part and induction coil part, and wherein the excitation coil part includes permalloy thin strip magnetic core, annular excitation winding skeleton and excitation wire winding, and the induction coil part includes square induction winding skeleton and induction wire winding, its characterized in that:
the annular excitation winding framework comprises an outer annular framework, a middle annular framework and an inner annular framework, the three annular frameworks are respectively installed in an orthogonal mode along the three directions of an X axis, a Y axis and a Z axis of a three-dimensional coordinate system, the outer ring of each annular framework is respectively provided with a square inserting bulge in the axial direction, and meanwhile the outer annular framework and the middle annular framework are respectively provided with square grooves in the corresponding positions of the inner rings thereof and used for the mutual nesting installation of the inner annular framework and the outer annular framework; the peripheral grooves of the outer layer annular framework, the middle layer annular framework and the inner layer annular framework are respectively jointed with a permalloy thin strip-shaped magnetic core to form an annular framework with the magnetic core; the excitation winding is uniformly wound on the outer layer annular framework to form an excitation coil;
the square induction winding framework comprises a middle-layer square framework and an inner-layer square framework, the three square frameworks are respectively installed in an orthogonal mode along the three directions of an X axis, a Y axis and a Z axis of a three-dimensional coordinate system, and meanwhile square grooves are formed in corresponding positions of the inner sides of the outer-layer square framework and the middle-layer square framework and used for mutually nesting and installing the inner square framework and the outer square framework; the annular excitation winding framework and the square induction winding framework are coaxial in three axes; a square groove is arranged at a corresponding position on the inner side of the inner layer square framework and is used for being mutually nested and installed with a square embedding bulge arranged on the outer circular ring of the outer layer annular framework; the induction winding is uniformly wound in the groove at the periphery of the outer square framework to form the induction coil.
2. The nested annular tri-axial fluxgate sensor detection probe of claim 1, wherein: the diameter of the outer layer annular framework is 20 mm-30 mm, the length and width of the axial inserting convex part are 1 mm-5 mm, and the thickness is 0.5 mm-1 mm; the diameter of the middle layer annular framework is 10 mm-20 mm, the length and width of the axial inserting convex part are 1 mm-5 mm, and the thickness is 0.5 mm-1 mm; the diameter of the inner layer annular framework is 5 mm-10 mm; all the frameworks are made of ceramic fiber materials or photosensitive resin materials.
3. The nested annular tri-axial fluxgate sensor detection probe of claim 1, wherein: four clamping grooves with the width of 0.5-1 mm and the length of 3.5-7 mm are reserved at the inner circular ring of the outer layer annular framework and the inner circular ring of the middle layer annular framework respectively and are used for fixing the next-stage annular framework.
4. The annular excitation bobbin of claim 1, wherein: the width of the permalloy thin strip-shaped magnetic core is 3 mm-10 mm, and the thickness of the permalloy thin strip-shaped magnetic core is 0.1 mm-0.3 mm; the permalloy thin strip-shaped magnetic core is uniformly wound around the outer groove of the outer layer annular framework for two circles to serve as an excitation coil magnetic core of the detection probe.
5. The square induction bobbin of claim 1 wherein: the inner side of the outer layer square framework is a square with the length and width of 30-35 mm; the inner side of the middle layer square framework is a rectangle with the length and width of 35 mm-40 mm; the inner side of the outer layer square framework is a rectangle with the length and width of 40 mm-45 mm; all the frameworks are made of ceramic fiber materials or photosensitive resin materials.
6. The square induction bobbin of claim 1 wherein: four clamping grooves with the width of 1-2 mm, the length of 10-20 mm and the thickness of 0.5-1 mm are reserved on the inner sides of the outer layer square framework, the middle layer square framework and the inner layer square framework respectively.
7. The excitation winding and the induction winding of claim 1, wherein: the induction winding or the excitation winding is made of enameled copper wires, and 200-800 turns of the enameled copper wires are wound to form an induction coil or an excitation coil.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114252817A (en) * | 2021-12-16 | 2022-03-29 | 北京微纳星空科技有限公司 | High-precision fluxgate probe and manufacturing method thereof |
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