Quadrature fluxgate sensor

Abstract

The present application relates to an orthogonal fluxgate sensor. The orthogonal fluxgate sensor comprises: a first top cover, a second top cover, 2N amorphous wire cores, and an induction coil, where N is a positive integer greater than 1; wherein the 2N amorphous wire cores are disposed between the first top cover and the second top cover, and the induction coil is wound around the 2N amorphous wire cores; the first top cover comprises a plurality of first conductive passages, and the second top cover comprises a plurality of second conductive passages, the first conductive passages and the second conductive passages being used to electrically connect the 2N amorphous wire cores to form N groups of cores connected in parallel, each core group comprising two electrically connected amorphous wire cores. This method can provide a highly sensitive orthogonal fluxgate sensor.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to an orthogonal fluxgate sensor. Background Art

[0002] With the development of iron core materials, a fundamental mode orthogonal fluxgate technology has reduced the sensor probe noise to the pT level, which has reached a level comparable to that of optically pumped sensors. The fundamental mode orthogonal fluxgate sensor has the characteristics of small size, low power consumption, low weight and low cost of traditional fluxgate sensors.

[0003] At present, the probe structure of the orthogonal fluxgate sensor is linear, and the basic structure of the probe part is a Co-based amorphous wire as the core material.

[0004] However, the sensitivity of the sensor with a linear probe structure is affected by the length of the amorphous iron core, and the sensitivity is low when the sensor is miniaturized. Summary of the Invention

[0005] Based on this, it is necessary to provide a highly sensitive orthogonal fluxgate sensor to address the above technical issues.

[0006] In a first aspect, the present application provides an orthogonal fluxgate sensor, the orthogonal fluxgate sensor comprising: a first top cover, a second top cover, 2N amorphous wire cores, and an induction coil, where N is a positive integer greater than 1;

[0007] Wherein, 2N amorphous wire cores are arranged between the first top cover and the second top cover, and the induction coil is wound outside the 2N amorphous wire cores;

[0008] The first top cover includes multiple first conductive vias, and the second top cover includes multiple second conductive vias. The first conductive vias and the second conductive vias are used to electrically connect 2N amorphous wire cores to form N groups of cores connected in parallel. Each core group includes two amorphous wire cores electrically connected to each other.

[0009] In one embodiment, the first conductive portion includes two first vias and a first connecting groove connected to the two first vias, the inner walls of the first vias and the first connecting grooves are both metal conductors, the inner walls of the first vias are in electrical contact with the inner walls of the first connecting grooves, and the first end of the amorphous wire core is inserted into the first via.

[0010] The second conductive portion includes two second vias and a second connecting groove connected to the two second vias. The inner walls of the second vias and the second connecting grooves are both metal conductors. The inner walls of the second vias are electrically contacted with the inner walls of the second connecting grooves. The second end of the amorphous wire core is inserted into the second via.

[0011] In one embodiment, the interior of the first connecting groove is filled with insulating rubber;

[0012] The interior of the second connection groove is filled with insulating rubber.

[0013] In one embodiment, a first excitation current terminal and a second excitation current terminal are provided on the second top cover, the first excitation current terminal is connected to an amorphous wire core in each core group, and the second excitation current terminal is connected to another amorphous wire core in each core group.

[0014] In one embodiment, the excitation current inputted through the first excitation current terminal has an opposite current direction to the excitation current inputted through the second excitation current terminal.

[0015] In one embodiment, the second top cover is provided with an induction coil terminal, which is connected to the induction coil.

[0016] In one embodiment, the orthogonal fluxgate sensor further includes a central skeleton having 2N receiving slots for receiving an amorphous wire core. The axial directions of the receiving slots are parallel to each other, and the axial directions of the receiving slots are parallel to the axial direction of the induction coil.

[0017] In one embodiment, the induction coil is wound on the central frame.

[0018] In one embodiment, the central skeleton is a hollow structure.

[0019] In one embodiment, a first protrusion is provided on the side of the first top cover facing the central frame, and a second protrusion is provided on the side of the second top cover facing the central frame. The first protrusion and the second protrusion cooperate with the hollow structure to fix the central frame.

[0020] The orthogonal fluxgate sensor comprises: a first top cover, a second top cover, 2N amorphous cores, and an induction coil, where N is a positive integer greater than 1; wherein the 2N amorphous cores are disposed between the first top cover and the second top cover, and the induction coil is wound around the 2N amorphous cores; the first top cover comprises a plurality of first conductive passages, and the second top cover comprises a plurality of second conductive passages, the first conductive passages and the second conductive passages being used to electrically connect the 2N amorphous cores to form N groups of cores connected in parallel, each core group comprising two electrically connected amorphous cores. Thus, N U-shaped core structures can be formed by forming N groups of cores connected in parallel, which can increase the effective volume of the sensor and greatly improve the sensitivity of the sensor. Furthermore, a U-shaped core structure is composed of two electrically connected amorphous cores, which avoids stress bending, reduces sensor noise, and further improves sensor sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 Schematic diagram of the principle of a fluxgate magnetic field sensor in one embodiment;

[0023] Figure 2 A schematic structural diagram of an orthogonal fluxgate sensor probe having a linear iron core structure in one embodiment;

[0024] Figure 3 Schematic diagram of the structure of an orthogonal fluxgate sensor in one embodiment;

[0025] Figure 4 Schematic diagram of the structure of an orthogonal fluxgate sensor in one embodiment;

[0026] Figure 5 Schematic diagram of the structure of the first conductive portion in the first top cover in one embodiment;

[0027] Figure 6 is a schematic structural diagram of the second conductive portion in the second top cover in one embodiment;

[0028] Figure 7 Schematic diagram of an equivalent amorphous wire core in one embodiment;

[0029] Figure 8 A comparison diagram of the output linearity of a straight iron core and a U-shaped iron core in one embodiment;

[0030] Figure 9 Schematic diagram of the structure of an orthogonal fluxgate sensor in another embodiment;

[0031] Figure 10 is a schematic structural diagram of a central skeleton in one embodiment;

[0032] Figure 11 is a schematic structural diagram of the first conductive portion in the first top cover in another embodiment;

[0033] Figure 12 Schematic diagram of the structure of the second conductive portion in the second top cover in another embodiment. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0036] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0037] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0038] It is understood that “at least one” refers to one or more, “a plurality” refers to two or more, and “at least a portion of an element” refers to a portion or all of an element.

[0039] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0040] The basic principle of the fluxgate magnetic field sensor is to generate an AC excitation magnetic field through an excitation coil, so that the soft magnetic core material switches between saturation and unsaturation states. Figure 1The schematic diagram of the principle of the fluxgate magnetic field sensor is shown in Figure 1, where B represents the magnetic induction intensity, H represents the magnetic field intensity, 101 represents that when the core material is saturated, the core is not affected by the external field, and 102 represents that when the core material is unsaturated, a magnetic field will be induced in the core under the external field. The magnetic field size can be measured by measuring the change in the magnetic flux in the core from saturation to unsaturation by the detection coil. The sensitivity of the fluxgate magnetic field sensor is generally 1nT (10 -9 T) to about 0.1nT, which is lower than the sensitivity of other magnetic field sensors, but the volume, weight, power consumption and cost of the magnetic field sensor are much smaller than other magnetic field sensors.

[0041] With the development of core materials, a fundamental-mode orthogonal fluxgate technology has reduced sensor probe noise to the picoT level, comparable to optically pumped sensors. Fundamental-mode orthogonal fluxgate sensors share the advantages of traditional fluxgate sensors: small size, low power consumption, low weight, and low cost. Orthogonal fluxgate technology, a type of fluxgate sensor, differs significantly from typical fluxgate sensors in that the excitation field and the external field are orthogonal, rather than parallel, to each other.

[0042] At present, the probe structure of the orthogonal fluxgate sensor is linear, and the basic structure of the probe part is a Co-based amorphous wire as the core material, such as Figure 2 The figure shows a schematic diagram of the structure of an orthogonal fluxgate sensor probe with a linear iron core structure, which includes an amorphous iron core 201, an induction coil 202, an AC excitation 203, a DC bias 204, and a phase-sensitive detector 205. The amorphous iron core 201 is excited by applying an excitation current to the amorphous iron core 201, and the magnetic flux changes on the amorphous iron core 201 are detected by the induction coil 202 wound thereon. In order to suppress the material noise of the iron core itself, a DC bias signal is added to the excitation end, and the excitation signal is used as a reference at the signal acquisition end, and a phase-locked amplifier is used to acquire the baseband signal.

[0043] The magnetic permeability, volume, and number of coil turns of the core material of the fluxgate sensor probe determine the sensitivity of the probe and sensor. For amorphous wire cores, the crystallization process determines that the wire diameter cannot be too large. Therefore, the intrinsic signal sensitivity is generally improved by extending the core length to increase the core volume and the range of winding. However, when the sensor is miniaturized, the linear probe structure has low sensitivity.

[0044] In view of this, an embodiment of the present application provides a highly sensitive orthogonal fluxgate sensor.

[0045] In an exemplary embodiment, Figure 3As shown, the orthogonal fluxgate sensor includes: a first top cover 301, a second top cover 302, 2N amorphous wire cores 303 and an induction coil 304, where N is a positive integer greater than 1; wherein, the 2N amorphous wire cores 303 are arranged between the first top cover 301 and the second top cover 302, and the induction coil 304 is wound outside the 2N amorphous wire cores 303; the first top cover 301 includes a plurality of first conductive passages, and the second top cover 302 includes a plurality of second conductive passages, and the first conductive passages and the second conductive passages are used to electrically connect the 2N amorphous wire cores 303 to form N groups of core groups connected in parallel, and each core group includes two amorphous wire cores 303 electrically connected to each other.

[0046] in, Figure 3 In the example, N is 2, that is, the orthogonal fluxgate sensor 30 includes 4 amorphous wire cores.

[0047] It is understandable that Figure 3 In order to illustrate the components of the orthogonal fluxgate sensor, the first top cover 301, the second top cover 302, the amorphous wire core 303 and the induction coil 304 are not assembled. Figure 4 As shown in the figure, the orthogonal fluxgate sensor 30 after the above components are assembled is shown, that is, 2N amorphous wire cores 303 are arranged between the first top cover 301 and the second top cover 302, and the induction coil 304 is wound around the 2N amorphous wire cores 303. Figure 4 Not shown.

[0048] Optionally, the amorphous wire core 303 is an iron core made of amorphous wire material. The amorphous wire material is a micro-filamentary alloy material without a fixed crystal structure prepared by a rapid cooling method and has excellent soft magnetic properties.

[0049] Optionally, the first top cover 301 may be an upper cover and the second top cover 302 may be a lower cover, or the first top cover 301 may be a lower cover and the second top cover 302 may be an upper cover, which is not limited in the embodiment of the present application.

[0050] Optionally, the first top cover 301 includes multiple first conductive passages, and two adjacent amorphous wire cores can be electrically connected through a first conductive passage to form a series circuit (i.e., a core group), and the multiple core groups can be connected in parallel through multiple second conductive passages in the second top cover 302.

[0051] Optionally, the first top cover 301 and the second top cover 302 may serve as cut-off ends of the induction coil 304 to assist in the winding of the induction coil.

[0052] The orthogonal fluxgate sensor comprises: a first top cover, a second top cover, 2N amorphous cores, and an induction coil, where N is a positive integer greater than 1; wherein the 2N amorphous cores are disposed between the first top cover and the second top cover, and the induction coil is wound around the 2N amorphous cores; the first top cover comprises a plurality of first conductive passages, and the second top cover comprises a plurality of second conductive passages, the first conductive passages and the second conductive passages being used to electrically connect the 2N amorphous cores to form N groups of cores connected in parallel, each core group comprising two electrically connected amorphous cores. Thus, N U-shaped core structures can be formed by the N groups of cores connected in parallel, which can increase the effective volume of the sensor and greatly improve the sensitivity of the sensor. Furthermore, a U-shaped core structure is composed of two electrically connected amorphous cores, which avoids stress bending, reduces sensor noise, and further improves sensor sensitivity.

[0053] In an exemplary embodiment, optionally, Figure 5 As shown, the first conductive portion includes two first vias 501 and a first connecting groove 502 connected to the two first vias 501. The inner walls of the first vias 501 and the first connecting groove 502 are both metal conductors. The inner wall of the first via 501 is in electrical contact with the inner wall of the first connecting groove 502. The first end of the amorphous wire core 303 is inserted into the first via 501; Figure 6 As shown, the second conductive portion includes two second vias 601 and a second connecting groove 602 connected to the two second vias. The inner walls of the second vias 601 and the second connecting groove 602 are both metal conductors. The inner wall of the second via 601 is electrically contacted with the inner wall of the second connecting groove 602. The second end of the amorphous wire core 303 is inserted into the second via 601.

[0054] It should be noted that Figure 5 and Figure 6 The description is made by taking four amorphous wire cores as an example, including two first conductive passages and two second conductive passages.

[0055] Optionally, the first conductive via portion may include two first via holes 501 . The first via holes 501 may be through holes or blind holes, which is not limited in this embodiment of the present application.

[0056] Optionally, the two second vias 601 included in the second conductive portion may be through holes or blind holes, which is not limited in this embodiment of the present application.

[0057] Optionally, for an amorphous wire core 303 , its first end can be inserted into the first through hole 501 , and its second end can be inserted into the second through hole 601 , so that the amorphous wire core can be fixed through the through holes in the first top cover 301 and the second top cover 302 .

[0058] Optionally, there is also a first connecting groove 502 in the first conductive portion that is connected to both first vias 501. Since the inner walls of the first via 501 and the first connecting groove 502 are both metal conductors, and the inner wall of the first via 501 is in electrical contact with the inner wall of the first connecting groove 502, the two amorphous wire cores 303 inserted into the two first vias of the first conductive portion can be connected in series, so that the two amorphous wire cores 303 and the first connecting groove 502 can form a U-shaped iron core structure.

[0059] Among them, the U-shaped iron core structure composed of the first conductive part and the two amorphous wire cores 303, compared with the U-shape formed by bending the iron core from the middle in the prior art, will not have stress concentration inside the iron core due to bending, which can reduce the noise of the sensor; at the same time, in the prior art, the part of the internal cavity of the U-shaped iron core is larger, and during the installation of the amorphous wire, the installation direction of the amorphous iron core is easy to deviate from the central axis direction of the ceramic sleeve part, so that the iron core and the axial direction of the induction coil are not parallel, and this non-parallelism will also affect the sensitivity and noise performance of the sensor. In the embodiment of the present application, the two ends of the amorphous wire core 303 are respectively inserted into the first through hole and the second through hole, and the amorphous wire core is fixed so that its axial direction is parallel to the axial direction of the induction coil, thereby further improving the sensitivity of the sensor.

[0060] In one embodiment, the interior of the first connection groove 502 is filled with insulating rubber, and the interior of the second connection groove 602 is filled with insulating rubber.

[0061] Optionally, electrical insulation can be achieved by filling insulating rubber to prevent the first connecting groove 502 and the second connecting groove 602 from short-circuiting or conductive contact with the outside. At the same time, the insulating rubber has good sealing performance and can prevent water, moisture or dust from entering the first connecting groove 502 and the second connecting groove 602.

[0062] In one embodiment, Figure 6 As shown, a first excitation current terminal 603 and a second excitation current terminal 604 are provided on the second top cover. The first excitation current terminal 603 is connected to an amorphous wire core in each core group, and the second excitation current terminal 604 is connected to another amorphous wire core in each core group.

[0063] Optionally, the excitation current inputted by the first excitation current terminal 603 and the excitation current inputted by the second excitation current terminal 604 have opposite current directions.

[0064] For example, Figure 6 As shown, the first excitation current terminal 603 can be connected to one second conductive via, and the second excitation current terminal 604 can be connected to another second conductive via.

[0065] Optional, such as Figure 7 As shown in FIG. 1 , the equivalent relationship of the amorphous wire core is shown. Taking four amorphous wire cores as an example, two core groups are connected in parallel. One amorphous wire core in each core group is connected to the first excitation current terminal, and the other amorphous wire core is connected to the second excitation current terminal.

[0066] Among them, in one core group, when the magnetic field changes in two amorphous wire cores are simultaneously detected by the induction coil 304 to achieve magnetic field measurement, since the excitation currents of the two amorphous wire cores 303 are opposite, the offset generated during the measurement process can be offset. This can avoid the problem of low linearity when measuring the geomagnetic field range in a linear core due to the deviation of the easy magnetization axis direction of the amorphous core from the main axis direction of the magnetic core.

[0067] For example, Figure 8 As shown, it is a comparison diagram of the output linearity of the straight core and the U-shaped core. The horizontal axis is the magnetic induction intensity, and the vertical axis is the induced voltage. 801 represents the output linearity of the straight core, and 802 represents the output linearity of the U-shaped core.

[0068] In an exemplary embodiment, Figure 6 As shown, optionally, an induction coil terminal 605 is provided on the second top cover 302 , and the induction coil terminal 605 is connected to the induction coil 304 .

[0069] Optional, Figure 6 In the embodiment, two induction coil terminals 605 are provided on the second top cover 302 . The number of the induction coil terminals is not limited in the embodiment of the present application.

[0070] Optionally, the magnetic flux change of the induction coil 304 can be obtained through the induction coil terminal 605 to determine the magnitude of the magnetic field.

[0071] In an exemplary embodiment, optionally, Figure 9 As shown, the orthogonal fluxgate sensor 30 further includes a central skeleton 305, as shown in FIG. Figure 10 As shown, the central skeleton 305 is provided with 2N receiving slots 306 , which are used to receive the amorphous wire core 303 . The axial directions of the receiving slots 306 are parallel to each other, and the axial direction of the receiving slots 306 is parallel to the axial direction of the induction coil 304 .

[0072] Optionally, the induction coil 304 is wound on the central frame 305 .

[0073] Optionally, since the axial direction of each accommodating slot 306 is parallel to the axial direction of the induction coil 304, and the induction coil 304 is wound on the central skeleton 305, this can ensure that the axial direction of the amorphous wire core 303 is parallel to the axial direction of the induction coil 304, thereby improving the sensitivity of the sensor.

[0074] Optionally, the central skeleton is a hollow structure.

[0075] Optionally, the central skeleton of the hollow structure can reduce the weight of the sensor probe on the one hand, and dissipate heat for the iron core structure on the other hand, thereby avoiding probe temperature drift caused by unstable temperature of the sensor probe due to heat accumulation. In other words, the central skeleton of the hollow structure can effectively suppress the problem of probe temperature drift.

[0076] In an exemplary embodiment, optionally, Figure 11 As shown, the first top cover 301 is provided with a first protrusion 503 on one side facing the central skeleton 305. Figure 12 As shown, a second protrusion 606 is provided on the side of the second top cover facing the central frame, and the first protrusion 503 and the second protrusion 606 cooperate with the hollow structure to fix the central frame 305.

[0077] Optionally, the first protrusion 503 may be embedded in one end of the hollow structure of the central skeleton 305 , and the second protrusion 606 may be embedded in the other end of the hollow structure of the central skeleton 305 .

[0078] Optionally, the first protrusion 503 and the multiple first electrical conductive parts can be located on the same side of the first top cover 301. It can be understood that at this time, the multiple first conductive parts are also facing the central skeleton 305, and the first via 501 in the first conductive part is a blind hole; or, the first protrusion 503 and the multiple first electrical conductive parts are respectively located on both sides of the first top cover 301. It can be understood that at this time, the multiple first electrical conductive parts are located on the side away from the central skeleton 305, and the first via 501 in the first conductive part is a through hole.

[0079] Optionally, the second protrusion 606 and the multiple second electrical conductive parts can be located on the same side of the second top cover 302. It can be understood that at this time, the multiple second conductive parts are also facing the central skeleton 305, and the second vias 601 in the second conductive parts are blind holes; or, the second protrusion 606 and the multiple second electrical conductive parts are respectively located on both sides of the second top cover 302. It can be understood that at this time, the multiple first electrical conductive parts are located on the side away from the central skeleton 305, and the second vias 601 in the second conductive parts are through holes.

[0080] It should be noted that Figure 11In the first top cover 301 shown, the first protrusion 503 and the plurality of first electrical conducting portions are respectively located on both sides of the first top cover 301. Figure 12 In the second top cover 302 shown, the second protrusion 606 and the plurality of second electrical conductive portions are respectively located on two sides of the second top cover 302 .

[0081] Among them, the first protrusion 503 and the second protrusion 606 cooperate with the hollow structure to fix the central skeleton, so that the amorphous wire cores in the central skeleton can be stably inserted into the first through-hole 501 and the second through-hole 601, and the axial direction of each amorphous wire core will not deviate, ensuring that the axial direction of the amorphous wire core 303 is parallel to the axial direction of the induction coil 304, which can improve the sensitivity of the sensor.

[0082] In the description of this specification, reference to the terms "some embodiments" or "other embodiments" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0083] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An orthogonal fluxgate sensor, characterized in that: The orthogonal fluxgate sensor comprises: a first top cover, a second top cover, 2N amorphous wire cores and an induction coil, where N is a positive integer greater than 1; The 2N amorphous wire cores are arranged between the first top cover and the second top cover, and the induction coil is wound outside the 2N amorphous wire cores; The first top cover includes a plurality of first conductive vias, and the second top cover includes a plurality of second conductive vias, wherein the first conductive vias and the second conductive vias are used to electrically connect the 2N amorphous wire cores to form N groups of cores connected in parallel, each of the core groups including two amorphous wire cores electrically connected to each other; The second top cover is provided with a first excitation current terminal and a second excitation current terminal, the first excitation current terminal is connected to one amorphous wire core in each of the core groups, and the second excitation current terminal is connected to the other amorphous wire core in each of the core groups; The excitation current inputted by the first excitation current terminal has an opposite current direction to the excitation current inputted by the second excitation current terminal.

2. The orthogonal fluxgate sensor according to claim 1, characterized in that: The first conductive portion includes two first via holes and a first connecting groove connected to the two first via holes, the inner walls of the first via holes and the first connecting groove are both metal conductors, the inner walls of the first via holes are in electrical contact with the inner walls of the first connecting groove, and the first end of the amorphous wire core is inserted into the first via hole; The second conductive portion includes two second vias and a second connecting groove connected to the two second vias. The inner walls of the second vias and the second connecting grooves are both metal conductors. The inner wall of the second via is electrically contacted with the inner wall of the second connecting groove. The second end of the amorphous wire core is inserted into the second via.

3. The orthogonal fluxgate sensor according to claim 2, characterized in that: The interior of the first connecting groove is filled with insulating rubber; The interior of the second connecting groove is filled with insulating rubber.

4. The orthogonal fluxgate sensor according to claim 2, characterized in that: The second top cover is provided with an induction coil terminal, and the induction coil terminal is connected to the induction coil.

5. The orthogonal fluxgate sensor according to any one of claims 1 to 4, characterized in that: The orthogonal fluxgate sensor also includes a central skeleton, which is provided with 2N accommodating slots for accommodating the amorphous wire core. The axial directions of the accommodating slots are parallel to each other, and the axial direction of the accommodating slots is parallel to the axial direction of the induction coil.

6. The orthogonal fluxgate sensor according to claim 5, characterized in that: The induction coil is wound on the central frame.

7. The orthogonal fluxgate sensor according to claim 6, characterized in that: The central skeleton is a hollow structure.

8. The orthogonal fluxgate sensor according to claim 7, characterized in that: A first protrusion is provided on the side of the first top cover facing the central frame, and a second protrusion is provided on the side of the second top cover facing the central frame. The first protrusion and the second protrusion cooperate with the hollow structure to fix the central frame.

Images