Demagnetizing coil structure

Abstract

This application relates to the field of demagnetization technology, and in particular to a demagnetizing coil structure. The demagnetizing coil structure includes a magnetic shielding box, three first coil groups, and two second coil groups. The three first coil groups are arranged at intervals along the height of the magnetic shielding box, located at the top, middle, and bottom of the box, respectively, and are connected in series. Each first coil group includes multiple first coils arranged circumferentially along the magnetic shielding box. The two second coil groups are located at the top and bottom of the magnetic shielding box and connected to their respective first coil groups. Each second coil group includes multiple spaced and parallel second coils, each wound along the surface of the magnetic shielding box. The magnetic shielding box has a maximum inscribed straight line segment at its top and bottom, and the projection of the second coil group covers the projection of this segment in a direction perpendicular to it. This arrangement forms a continuous magnetic circuit, promotes uniform distribution of the demagnetizing magnetic field, and reduces the number of openings.

Description

Technical Field

[0001] This application relates to the field of demagnetization technology, and in particular to a demagnetization coil structure. Background Technology

[0002] In the field of magnetic field measurement and applications, high-performance demagnetizing coil systems are one of the key elements for achieving precise magnetic field control and measurement. Demagnetizing coil systems are used to reduce the residual magnetic field in magnetic shielding devices to improve shielding effectiveness and ensure the accuracy of magnetic field measurements. However, in traditional demagnetizing coil systems, multiple layers of coils are typically evenly distributed on each surface of the magnetic shielding box, resulting in excessive openings. This leads to the concentration of magnetic induction intensity, affecting the uniformity of the magnetic field distribution and consequently impacting the demagnetizing effect. Utility Model Content

[0003] Therefore, it is necessary to provide a demagnetizing coil structure to promote uniform magnetic field distribution, reduce openings and magnetic field concentration, so as to ensure the demagnetizing effect.

[0004] The demagnetizing coil structure includes a magnetic shielding box, three first coil groups, and two second coil groups. The three first coil groups are arranged at intervals along the height direction of the magnetic shielding box and connected in series. One first coil group is located near the top of the magnetic shielding box, another near the bottom, and the third in the middle. Each first coil group includes multiple first coils arranged circumferentially around the magnetic shielding box. One second coil group is located at the top of the magnetic shielding box and connected to one of the first coil groups, while the other is located at the bottom and connected to one of the first coil groups. Each second coil group includes multiple spaced and parallel second coils, each second coil wound around the top or bottom of the magnetic shielding box on both sides along its own thickness direction. The magnetic shielding box has a maximum inscribed straight line segment at its top and bottom, respectively. Along a direction perpendicular to the maximum inscribed straight line segment, the projection of the second coil group covers the projection of the maximum inscribed straight line segment. The two ends of the maximum inscribed straight line segment are respectively provided with second coils.

[0005] It is understandable that by arranging three first coil groups around the circumference of the magnetic shielding box to form a uniform demagnetizing magnetic field in the vertical direction, and by setting second coil groups at the top and bottom of the magnetic shielding box, with each second coil wound around both sides of the top or bottom of the magnetic shielding box along its own thickness direction, a horizontal demagnetizing magnetic field is formed. At the top or bottom, multiple second coils are spaced apart, and the projection of the second coil group covers the projection of the largest inscribed straight line segment. Second coils are located at both ends of the largest inscribed straight line segment, which helps to promote a uniform distribution of the demagnetizing magnetic field at the top and bottom of the magnetic shielding box and ensures coverage of all corners of the magnetic shielding box. Through the combined action of the vertical magnetic field formed by the first coils and the horizontal magnetic field formed by the second coils, magnetic field accumulation at corners or inflection points can be reduced or avoided. Simultaneously, the three first coil groups are connected in series, and each second coil group is connected in series with its corresponding first coil group to form a complete and continuous current loop, which in turn forms a continuous magnetic circuit, making the demagnetizing magnetic field intensity on each surface of the magnetic shielding box approximately the same, thus promoting a uniform distribution of the demagnetizing magnetic field. The demagnetizing magnetic field of the entire magnetic shielding box can be uniformly covered by only three first coil groups and two second coil groups. The number of openings is small, which helps to reduce magnetic field concentration and promote the uniformity of the demagnetizing magnetic field distribution.

[0006] In one embodiment, the magnetic shielding box is configured as a cube, and the largest inscribed straight line segment is the diagonal of the magnetic shielding box located at its top or in the plane containing the top. At the top or bottom of the magnetic shielding box, one of the second coils is located on the diagonal and extends along the extension direction of the diagonal to both ends of the diagonal.

[0007] In one embodiment, the magnetic shielding box is configured as a cylinder, and the largest inscribed straight line segment is the diameter segment of the magnetic shielding box located at its top or in the plane containing the top. At the top or bottom of the magnetic shielding box, one of the second coils is located on the diameter segment and extends along the extension direction of the diameter segment to both ends of the diameter segment.

[0008] In one embodiment, the first coil includes a first segment and a second segment, the first segment being disposed on the outside of the magnetic shielding box and the second segment being disposed on the inside of the magnetic shielding box; In the first coil group near the top or bottom of the magnetic shielding box, the first segment and the second segment are respectively connected to the second coil group; In the first coil group located in the middle of the magnetic shielding box, the first segment and the second segment are connected. One of the first segment and the second segment is connected to the first coil group near the top of the magnetic shielding box, and the other is connected to the first coil group near the bottom of the magnetic shielding box.

[0009] In one embodiment, the second coil includes a third segment and a plurality of fourth segments connected to the third segment. The third segment is located on the outside of the magnetic shielding box, and the fourth segment is located on the inside of the magnetic shielding box. The plurality of third segments and the plurality of fourth segments are arranged and connected in a one-to-one correspondence. In this configuration, one of the third segment and the fourth segment is connected to the first segment, and the other is connected to the second segment.

[0010] In one embodiment, the first segment, the second segment, the third segment, and the fourth segment are respectively provided on either side of the largest inscribed line; The first segment and the second segment, which are located on the same side and in the same plane, are connected together; any two adjacent second coils on the same side are connected together; and the first coil and the second coil, which are located on the same side, are connected in series along the height direction of the magnetic shielding box. The two first coil groups located on either side of the largest inscribed straight line are connected in series by a wire; At the top or bottom of the magnetic shielding box, the second coil located on the maximum inner straight line is connected to the second coil located on one of the two sides of the maximum inner straight line.

[0011] In one embodiment, the first segment includes a first segment and a second segment, which are connected and angled together.

[0012] In one embodiment, the second segment includes a third segment and a fourth segment, which are connected and angled together.

[0013] In one embodiment, the magnetic shielding box is provided with a plurality of spaced connection holes, and the first coil group and the second coil group are connected in series by passing through the corresponding connection holes.

[0014] In one embodiment, the demagnetizing coil structure further includes multiple connectors; The first coil and the second coil are connected via the connector; and / or, at least two of the first coils are connected by a wire, and the first coil and the wire are connected via the connector; and / or, at least the first coil is fitted with the connector, and two of the connectors are connected to an external power source. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the demagnetizing coil structure provided in this application; Figure 2 A perspective view of the demagnetizing coil structure provided in this application; Figure 3 A cross-sectional view of the demagnetizing coil structure provided in this application.

[0017] Reference numerals: 100, demagnetizing coil structure; 10, magnetic shielding box; 101, connecting hole; 20, first coil group; 21, first coil; 211, first segment; 2111, first segment; 2112, second segment; 212, second segment; 2121, third segment; 2122, fourth segment; 30, second coil group; 31, second coil; 311, third segment; 312, fourth segment; 40, wire. Detailed Implementation

[0018] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0019] It should be noted that when a component is referred to as being "fixed to," "set on," or "properly placed on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0023] Please see Figures 1 to 3 This application provides a demagnetizing coil structure 100, which includes a magnetic shielding box 10, three first coil groups 20, and two second coil groups 30. When energized, the first coil groups 20 and second coil groups 30 respectively generate demagnetizing magnetic fields to disrupt the magnetic domain arrangement of the residual magnetic field inside the magnetic shielding box 10, thereby achieving a demagnetizing effect. By rationally designing the arrangement of the three first coil groups 20 and the two second coil groups 30, while achieving a uniform distribution of the demagnetizing magnetic field, the number of openings can be reduced, thereby reducing the accumulation of residual magnetic fields and further promoting the uniformity of the demagnetizing magnetic field, without the need for multiple coils.

[0024] like Figure 1 and Figure 2As shown, in an optional embodiment, each first coil group 20 includes a plurality of first coils 21 arranged circumferentially along the magnetic shielding box 10 to form magnetic field lines arranged circumferentially along the magnetic shielding box 10 and extending vertically, thereby forming a demagnetizing magnetic field covering the sidewalls of the magnetic shielding box 10 circumferentially. The vertical direction is the height direction of the magnetic shielding box 10. Further, three first coil groups 20 are arranged at intervals and connected in series along the height direction of the magnetic shielding box 10, with one first coil group 20 near the top of the magnetic shielding box 10, one first coil group 20 near the bottom of the magnetic shielding box 10, and one first coil group 20 located in the middle of the magnetic shielding box 10. That is, the first coil group 20 located in the middle of the magnetic shielding box 10 is positioned between the other two first coil groups 20 along the height direction. The demagnetizing coil structure 100 provides first coil groups 20 at the upper, middle, and lower positions of the magnetic shielding box 10, promoting a uniform distribution of the demagnetizing magnetic field along the various sides of the magnetic shielding box 10 circumferentially. Meanwhile, the three first coil groups 20 are connected in series to form a complete and continuous magnetic circuit on the surface of the magnetic shielding box 10 around the perimeter, which promotes the magnetic field strength to be close to the same and is conducive to the uniform distribution of the demagnetizing magnetic field.

[0025] like Figure 1 and Figure 2 As shown, in an optional embodiment, each second coil 31 is wound around both sides of the top or bottom of the magnetic shielding box 10 along its own thickness direction to form a horizontal magnetic field at the top or bottom of the magnetic shielding box 10. The horizontal direction refers to the direction of the horizontal plane where the top or bottom plane of the magnetic shielding box 10 is located. The second coil group 30 includes multiple spaced and parallel second coils 31, which facilitates the formation of a uniform demagnetizing magnetic field. One second coil group 30 is located at the top of the magnetic shielding box 10 and connected to one of the first coil groups 20, while another second coil group 30 is located at the bottom of the magnetic shielding box 10 and connected to one of the first coil groups 20, which facilitates the formation of a complete and continuous magnetic circuit on the surface of the magnetic shielding box 10, thereby promoting the uniformity of the magnetic field distribution.

[0026] The magnetic shielding box 10 has a maximum inscribed straight line segment at its top and bottom, which refers to the longest line segment in the plane containing the top or bottom. Along a direction perpendicular to the maximum inscribed straight line segment, the projection of the second coil group 30 covers the projection of the maximum inscribed straight line segment. Second coils 31 are respectively provided at both ends of the maximum inscribed straight line segment to ensure that the demagnetizing magnetic field formed by multiple second coils 31 can cover the ends of the maximum inscribed straight line segment, thereby ensuring that the demagnetizing magnetic field formed by multiple second coils 31 can cover all corners of the top or bottom of the magnetic shielding box 10, reducing or avoiding the formation of residual magnetic field accumulation at corners or inflection points. Simultaneously, the vertical demagnetizing magnetic field formed by the first coil group 20 and the horizontal demagnetizing magnetic field formed by the second coil group 30 can overlap at the corners or inflection points of the magnetic shielding box 10, significantly reducing the accumulation of residual magnetic field at corners or inflection points and ensuring the demagnetizing effect.

[0027] In summary, it is through the arrangement of the first coil group 20 and the second coil group 30 that a continuous magnetic circuit is formed on each surface of the magnetic shielding box 10, which promotes the uniformity of the demagnetizing magnetic field distribution, reduces the number of openings, thereby reducing magnetic field concentration and improving the demagnetizing effect.

[0028] like Figures 1 to 3 As shown, in an optional embodiment, the magnetic shielding box 10 is configured as a cube, with the largest inscribed straight line segment being the diagonal of the magnetic shielding box 10 located at its top or in the plane containing its top. At the top or bottom of the magnetic shielding box 10, one of the second coils 31 is located on the diagonal and extends along the diagonal to both ends of the diagonal. This arrangement ensures that the magnetic field generated by the second coil 31 can cover the diagonals at both ends of the diagonal. Since multiple second coils 31 are arranged in parallel and spaced apart, the diagonals on the other diagonal that intersect with the second coils 31 can also be uniformly covered by the demagnetizing magnetic field, which helps to reduce the number of second coils 31 required, thereby reducing the number of perforations.

[0029] In another optional embodiment, the magnetic shielding box 10 is configured as a cylinder, with its largest inscribed straight line segment being the diameter segment of the magnetic shielding box 10 located at its top or within the plane containing its top. At the top or bottom of the magnetic shielding box 10, one of the second coils 31 is located within the diameter segment and extends along the direction of the diameter segment to both ends. This arrangement ensures that the magnetic field generated by the second coil 31 can cover the corners at both ends of the diameter segment. Because multiple second coils 31 are arranged in parallel and spaced intervals, the entire top or bottom plane can be uniformly covered by the demagnetizing magnetic field.

[0030] like Figure 3As shown, in a specific embodiment, the first coil 21 includes a first segment 211 and a second segment 212. The first segment 211 is located on the outside of the magnetic shielding box 10, and the second segment 212 is located on the inside of the magnetic shielding box 10. By providing the first coil 21 on both the inside and outside of the magnetic shielding box 10, the coil is wound around the perimeter wall of the magnetic shielding box 10, which facilitates the formation of a demagnetizing magnetic field that is parallel to and uniformly distributed on the perimeter wall of the magnetic shielding box 10.

[0031] like Figure 1 and Figure 2 As shown, in a specific embodiment, in the first coil group 20 near the top or bottom of the magnetic shielding box 10, the first segment 211 and the second segment 212 are respectively connected to the second coil group 30. That is, the first segment 211 and the second segment 212 in the first coil group 20 near the top are respectively connected to the second coil group 30 located at the top, and the first segment 211 and the second segment 212 in the first coil group 20 near the bottom are respectively connected to the second coil group 30 located at the bottom, so that the first coil 21 and the second coil 31 can be connected to form a continuous magnetic circuit. For example, at the top of the magnetic shielding box 10, a second coil 31 is connected between the first segment 211 and the second segment 212. Current enters the second coil 31 from one of the first segment 211 and the second segment 212, and is output to the other after passing through the second coil 31.

[0032] like Figure 2 As shown, in a specific embodiment, in the first coil group 20 located in the middle of the magnetic shielding box 10, the first segment 211 and the second segment 212 are connected. One of the first segment 211 and the second segment 212 is connected to the first coil group 20 near the top of the magnetic shielding box 10, and the other is connected to the first coil group 20 near the bottom of the magnetic shielding box 10, so as to realize the series connection of the three first coil groups 20 and promote the continuous flow of current.

[0033] like Figure 2 In a specific embodiment, the second coil 31 includes a third segment 311 and multiple fourth segments 312 connected to the third segment 311. The third segment 311 is located on the outside of the magnetic shielding box 10, and the fourth segments 312 are located on the inside of the magnetic shielding box 10. The multiple third segments 311 and multiple fourth segments 312 are arranged and connected in a one-to-one correspondence, so that at the top or bottom of the magnetic shielding box 10, the second coil 31 is wound along the surface of the magnetic shielding box 10 through the connection of the inner fourth segments 312 and the outer third segments 311, thereby outputting a demagnetizing magnetic field parallel to the plane of the top or bottom. One of the third segment 311 and one of the fourth segments 312 is connected to the first segment 211, and the other is connected to the second segment 212, thereby achieving the connection between the first coil 21 and the second coil 31 and promoting the continuity of the magnetic circuit.

[0034] like Figure 2 As shown, in a specific embodiment, a first segment 211, a second segment 212, a third segment 311, and a fourth segment 312 are respectively provided on either side of the largest inscribed straight line to form a through magnetic circuit on both sides of the largest inscribed straight line.

[0035] like Figure 2 As shown, in a specific embodiment, the first segment 211 and the second segment 212, located on the same side and in the same plane, are connected to achieve current continuity within the first coil 21 on the same side of the maximum inscribed straight line. In a specific embodiment, any two adjacent second coils 31 located on the same side are connected to achieve current continuity between adjacent second coils 31 on the same side. Furthermore, the first coil 21 and the second coil 31 located on the same side are connected in series along the height direction of the magnetic shielding box 10 to achieve the continuity of the magnetic circuit on the same side.

[0036] like Figure 2 As shown, in a further embodiment, the two first coil groups 20 located on both sides of the maximum inscribed straight line are connected in series by wires 40 to realize the magnetic circuit connection on both sides of the maximum inscribed straight line, thereby forming a continuous magnetic circuit on the surface of the magnetic shielding box 10.

[0037] like Figure 2 As shown, in a specific embodiment, at the top or bottom of the magnetic shielding box 10, the second coil 31 located on the maximum inner line is connected to the second coil 31 located on one of the two sides of the maximum inner line to facilitate the formation of a coherent magnetic circuit.

[0038] like Figure 1 As shown, in a specific embodiment, the magnetic shielding box 10 is provided with a plurality of spaced-apart connection holes 101. The first coil group 20 and the second coil group 30 are connected in series by passing through the corresponding connection holes 101. The connection holes 101 facilitate the connection between the inner and outer sides of the first coil 21 or the second coil 31 on the same wall surface, and also facilitate the connection between the first coil 21 and the second coil 31 on different wall surfaces. For example, in the middle of the magnetic shielding box 10, the first segment 211 passes through one of the connection holes 101 and is connected to the second segment 212.

[0039] like Figure 3As shown, in a specific embodiment, the first segment 211 includes a first segment 2111 and a second segment 2112, which are connected and angled together. The second segment 212 includes a third segment 2121 and a fourth segment 2122, which are connected and angled together. This arrangement facilitates wiring and assembly, reduces wire tangling, and also reduces the number of connection holes 101, thereby reducing the accumulation of residual magnetic fields. For example, the first segment 2111 and the second segment 2112 are vertically arranged to form an L-shaped first segment 211, and the third segment 2121 and the fourth segment 2122 are vertically arranged to form an L-shaped second segment 212.

[0040] In a specific embodiment, the demagnetizing coil structure 100 further includes multiple connectors; the first coil 21 and the second coil 31 are connected via connectors. In some embodiments, at least two of the first coils 21 are connected via wires 40, and the first coil 21 and the wires 40 are connected via connectors. In some embodiments, at least the first coil 21 is equipped with connectors, and two of the connectors are connected to an external power source to enable current input and output. Connecting via connectors facilitates insertion and removal, and is convenient for assembly and disassembly.

[0041] For example, such as Figures 1 to 3 As shown in the figure, taking the magnetic shielding box 10 as a cube as an example, the first coil 21 and the second coil 31 are respectively attached to the surface of the magnetic shielding box 10. The first coil 21 located at the top of the magnetic shielding box 10 has a connector for connection to an external power source. Current is input to the first segment 211 and output from the first segment 211 to the second coil 31 located at the top of the magnetic shielding box 10. On one side of the largest inscribed straight line segment, the current passes through multiple second coils 31 in sequence and outputs from the second coils 31 to the second segment 212 located on the inner side of the top of the magnetic shielding box 10. The second segment 212 is connected to the first segment 211 of the first coil 21 located in the middle of the magnetic shielding box 10 through a wire 40, and the current is input to the first coil 21 in the middle of the magnetic shielding box 10.

[0042] In the middle of the magnetic shielding box 10, on one side of the largest inner straight section, the first segment 211 of the first coil 21 is connected to the second segment 212 located inside the magnetic shielding box 10, and current is output from the second segment 212. The second segment 212 is connected to the first segment 211 of the first coil 21 near the bottom of the magnetic shielding box 10 via a wire 40, so as to input current into the first coil 21 located at the bottom of the magnetic shielding box 10. Near the bottom of the magnetic shielding box 10, on one side of the largest inner straight section, current is output from the first segment 211 to the second coil 31 located at the bottom of the magnetic shielding box 10. At the bottom of the magnetic shielding box 10, on one side of the largest inner straight section, current passes sequentially through multiple second coils 31 and is output from the second coils 31 to the second segment 212 located inside the bottom of the magnetic shielding box 10. This second segment 212 is connected to the first segment 211 of the first coil 21 located at the top of the magnetic shielding box 10 and on the other side of the largest inner straight section via a wire 40.

[0043] On the other side of the largest inscribed straight line segment, at the top of the magnetic shielding box 10, current is output from the first segment 211 of the first coil 21 to the second coil 31 located at the top of the magnetic shielding box 10. The current passes through multiple second coils 31 in sequence and is output from the second coils 31 to the second segment 212 located inside the magnetic shielding box 10. The second segment 212 is connected to the first coil 21 located in the middle of the magnetic shielding box 10 via a wire 40. Current is input from the second segment 212 at the top of the magnetic shielding box 10 to the first segment 211 in the middle of the magnetic shielding box 10, and is output from the second segment 212 in the middle of the magnetic shielding box 10. The second section 212 located in the middle of the magnetic shielding box 10 outputs current to the first section 211 located at the bottom of the magnetic shielding box 10. The current is output from the first section 211 at the bottom of the magnetic shielding box 10 to the second coil 31 located at the bottom of the magnetic shielding box 10. The current passes through multiple second coils 31 in sequence and is output from the second coils 31 to the second section 212 located on the inner side of the bottom of the magnetic shielding box 10. The second section 212 is connected to an external power source through a wire 40 to form a complete and continuous current loop, thereby forming a continuous magnetic circuit and promoting uniform magnetic field distribution.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0045] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A demagnetizing coil structure, characterized in that, include: Magnetic shielding box; Three first coil groups are arranged at intervals and connected in series along the height direction of the magnetic shielding box. One of the first coil groups is close to the top of the magnetic shielding box, one of the first coil groups is close to the bottom of the magnetic shielding box, and one of the first coil groups is located in the middle of the magnetic shielding box. Each first coil group includes a plurality of first coils arranged circumferentially along the magnetic shielding box. Two second coil groups, one of which is located at the top of the magnetic shielding box and connected to one of the first coil groups, and the other of which is located at the bottom of the magnetic shielding box and connected to one of the first coil groups; the second coil group includes a plurality of spaced and parallel second coils, each of which is wound around the top or bottom of the magnetic shielding box on both sides along its own thickness direction. The magnetic shielding box has a maximum inscribed straight line segment at its top and bottom, and the projection of the second coil group covers the projection of the maximum inscribed straight line segment along a direction perpendicular to the maximum inscribed straight line segment; the second coil is provided at both ends of the maximum inscribed straight line segment.

2. The demagnetizing coil structure according to claim 1, characterized in that, The magnetic shielding box is configured as a cube, and the largest inscribed straight line segment is the diagonal of the magnetic shielding box located at its top or in the plane containing the top. At the top or bottom of the magnetic shielding box, one of the second coils is located on the diagonal and extends along the extension direction of the diagonal to both ends of the diagonal.

3. The demagnetizing coil structure according to claim 1, characterized in that, The magnetic shielding box is configured as a cylinder, and the largest inscribed straight line segment is the diameter line segment of the magnetic shielding box located at its top or in the plane containing the top. At the top or bottom of the magnetic shielding box, one of the second coils is located on the diameter line segment and extends along the extension direction of the diameter line segment to both ends of the diameter line segment.

4. The demagnetizing coil structure according to claim 2 or 3, characterized in that, The first coil includes a first segment and a second segment, the first segment being located on the outside of the magnetic shielding box and the second segment being located on the inside of the magnetic shielding box; In the first coil group near the top or bottom of the magnetic shielding box, the first segment and the second segment are respectively connected to the second coil group; In the first coil group located in the middle of the magnetic shielding box, the first segment and the second segment are connected. One of the first segment and the second segment is connected to the first coil group near the top of the magnetic shielding box, and the other is connected to the first coil group near the bottom of the magnetic shielding box.

5. The demagnetizing coil structure according to claim 4, characterized in that, The second coil includes a third segment and multiple fourth segments connected to the third segment. The third segment is located on the outside of the magnetic shielding box, and the fourth segment is located on the inside of the magnetic shielding box. The multiple third segments and multiple fourth segments are arranged and connected in a one-to-one correspondence. In this configuration, one of the third segment and the fourth segment is connected to the first segment, and the other is connected to the second segment.

6. The demagnetizing coil structure according to claim 5, characterized in that, The first segment, the second segment, the third segment, and the fourth segment are respectively provided on either side of the largest inscribed straight line; The first segment and the second segment, which are located on the same side and in the same plane, are connected together; any two adjacent second coils on the same side are connected together; and the first coil and the second coil, which are located on the same side, are connected in series along the height direction of the magnetic shielding box. The two first coil groups located on either side of the largest inscribed straight line are connected in series by a wire; At the top or bottom of the magnetic shielding box, the second coil located on the maximum inner straight line is connected to the second coil located on one of the two sides of the maximum inner straight line.

7. The demagnetizing coil structure according to claim 6, characterized in that, The first segment includes a first segment and a second segment, which are connected and set at an angle.

8. The demagnetizing coil structure according to claim 6, characterized in that, The second segment includes a third segment and a fourth segment, which are connected and set at an angle.

9. The demagnetizing coil structure according to claim 6, characterized in that, The magnetic shielding box is provided with multiple spaced connection holes, and the first coil group and the second coil group are connected in series by passing through the corresponding connection holes.

10. The demagnetizing coil structure according to claim 6, characterized in that, The demagnetizing coil structure also includes multiple connectors; The first coil and the second coil are connected via the connector; and / or, at least two of the first coils are connected by a wire, and the first coil and the wire are connected via the connector; and / or, at least the first coil is fitted with the connector, and two of the connectors are connected to an external power source.

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