Degaussing device with degaussing coils distributed diagonally

Abstract

The invention belongs to the technical field of magnetic material degaussing, and particularly relates to a degaussing device with degaussing coils distributed diagonally, comprising a magnetic shielding box which is of a regular hexahedron structure and is provided with six winding surfaces and twelve ridges; the degaussing coil is wound inside and outside the magnetic shielding box, and the magnetic shielding box divides the degaussing coil into a plurality of degaussing sections; the degaussing sections arranged on the inner side and the outer side of the same winding surface are symmetrical; and the degaussing sections on the two sides of the same ridge are symmetrical. According to the degaussing coil structure, the distribution directions of the coils on any two adjacent winding surfaces are inconsistent. The magnetic circuit generated on each plane and the direction of the demagnetization induction intensity can be staggered, the situation that the demagnetization effect is reduced due to the influence of the magnetic circuits on the adjacent faces is avoided, meanwhile, each coil can surround all the planes of the magnetic shielding box through the coil surrounding mode, and all the planes of the magnetic shielding box can be demagnetized at the same time.

Description

Technical Field

[0001] This invention belongs to the field of magnetic material demagnetization technology, and particularly relates to a demagnetization device with demagnetization coils distributed diagonally. Background Technology

[0002] With advancements in quantum theory and quantum sensors, atomic magnetometers, as cutting-edge quantum devices, have improved magnetic field measurement sensitivity from the fT level to the aT level. To achieve optimal sensitivity, atomic magnetometers require a self state under extremely weak magnetic fields, making the construction of magnetically shielded devices in zero-magnetic-space conditions crucial.

[0003] For low-frequency or static magnetic fields, soft magnetic materials (such as permalloy, ferrite, and iron-based nanocrystals) are currently widely used for high-performance passive magnetic shielding. The principle is to use the high permeability of the material to guide the magnetic circuit, allowing more magnetic lines of force to pass through the shielding material, thereby achieving magnetic circuit shunting and reducing the magnetic field strength within the shielded space.

[0004] A high-performance demagnetizing device is indispensable for constructing a magnetic shielding device.

[0005] Demagnetization technology encompasses both demagnetization waveform optimization and demagnetization coil structure design.

[0006] The structural design of the demagnetizing coil mainly includes optimization of coil shape, orientation, and distributed arrangement, aiming to solve the problem of uneven distribution of the demagnetizing magnetic field, which leads to inconsistent magnetization intensity inside the material.

[0007] Existing high-performance passive shielding demagnetization systems suffer from problems such as discontinuous magnetic circuits, significant mutual influence between the demagnetizing magnetic field strengths of different surfaces, inability to demagnetize simultaneously on different surfaces, and poor demagnetization uniformity during the demagnetization process.

[0008] Therefore, there is an urgent need for a demagnetizing device with diagonally distributed demagnetizing coils to solve this problem. Summary of the Invention

[0009] The purpose of this invention is to provide a demagnetizing device with diagonally distributed demagnetizing coils to solve the above-mentioned problems.

[0010] To achieve the above objectives, the present invention provides the following solution:

[0011] A demagnetizing device with demagnetizing coils distributed diagonally, comprising:

[0012] A magnetic shielding box, wherein the magnetic shielding box has a regular hexahedral structure and has six winding surfaces and twelve edges;

[0013] At least one continuous demagnetizing coil is wound inside and outside the magnetic shielding box, wherein the magnetic shielding box divides the demagnetizing coil into several demagnetizing segments;

[0014] The demagnetizing segments arranged on the inner and outer sides of the same winding surface are symmetrical;

[0015] The demagnetizing segments on both sides of the same ridge are symmetrical.

[0016] Optionally, the demagnetizing coil is provided with three coils, namely a first demagnetizing coil, a second demagnetizing coil, and a third demagnetizing coil, which are arranged in parallel.

[0017] Optionally, the winding surface is provided with a through hole for passing the demagnetizing coil.

[0018] Optionally, the current directions within the demagnetizing sections symmetrically arranged on the inner and outer sides of the same winding surface are opposite.

[0019] Optionally, the magnetic shielding box is made of a high magnetic permeability material.

[0020] Optionally, the demagnetizing coil is made of copper wire.

[0021] Optionally, the wire hole is a round hole.

[0022] Optionally, the cross-sectional area of ​​the demagnetizing coil is 28 mm². 2 .

[0023] Optionally, the wall thickness of the magnetic shielding box is 3mm.

[0024] Compared with the prior art, the present invention has the following advantages and technical effects:

[0025] By winding demagnetizing coils around a magnetic shielding box, each demagnetizing coil starts at a point and winds around six surfaces of the magnetic shielding box before reaching its endpoint. The continuous winding ensures a consistent internal current direction, and the demagnetizing coils are evenly distributed inside and outside the magnetic shielding box. This structure allows the coil distribution directions on any two adjacent winding surfaces to be inconsistent. This staggers the magnetic circuits and demagnetizing induction directions generated on each plane, avoiding the influence of adjacent magnetic circuits and thus preventing a reduction in demagnetizing effect. Furthermore, the coil winding method allows each coil to wrap around all planes of the magnetic shielding box, enabling simultaneous demagnetization of all planes. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the present invention from another angle;

[0029] Figure 3 This is a diagram showing the winding sequence of the second demagnetizing coil of the present invention;

[0030] Figure 4 This is a diagram showing the winding sequence of the first or third demagnetizing coil of the present invention;

[0031] Among them, 1 is the first demagnetizing coil; 2 is the second demagnetizing coil; and 3 is the third demagnetizing coil. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figures 1 to 4 This invention discloses a demagnetizing device with diagonally distributed demagnetizing coils, comprising:

[0035] The magnetic shielding box has a regular hexahedral structure and has six winding surfaces and twelve edges.

[0036] At least one continuous demagnetizing coil is wound inside and outside the magnetic shielding box, wherein the magnetic shielding box divides the demagnetizing coil into several demagnetizing sections;

[0037] The demagnetizing sections on the inner and outer sides of the same winding surface are symmetrical;

[0038] The demagnetization segments on both sides of the same edge are symmetrical.

[0039] By winding demagnetizing coils around a magnetic shielding box, each demagnetizing coil starts at a point and winds around six surfaces of the magnetic shielding box before reaching its endpoint. The continuous winding ensures a consistent internal current direction, and the demagnetizing coils are evenly distributed inside and outside the magnetic shielding box. This structure allows the coil distribution directions on any two adjacent winding surfaces to be inconsistent. This staggers the magnetic circuits and demagnetizing induction directions generated on each plane, avoiding the influence of adjacent magnetic circuits and thus preventing a reduction in demagnetizing effect. Furthermore, the coil winding method allows each coil to wrap around all planes of the magnetic shielding box, enabling simultaneous demagnetization of all planes.

[0040] The starting point and the ending point of the bypass are set at intervals, and the starting point and the ending point of the bypass are located on the same ridge line.

[0041] As an optional implementation, there are three demagnetizing coils, namely the first demagnetizing coil 1, the second demagnetizing coil 2 and the third demagnetizing coil 3, which are arranged in parallel.

[0042] The three demagnetizing coils in this invention are non-equidistantly distributed, which allows for a more uniform demagnetizing effect on each magnetic shielding box surface.

[0043] This device includes a magnetically shielded box with a hexahedral structure. Six demagnetizing coils are arranged parallel to and symmetrically along a diagonal of their respective planes on each surface of the shielded box. Furthermore, the distribution direction of the demagnetizing coils on each surface differs from that on any adjacent surface. This asymmetrical coil distribution on any two adjacent winding surfaces offsets the magnetic circuits and demagnetizing induction intensities generated on each plane, preventing the demagnetization effect from being reduced due to the influence of adjacent surface magnetic circuits. This offsetting of the magnetic circuits on each surface, resulting in inconsistent demagnetizing magnetic field directions, reduces the mutual influence of demagnetizing magnetic fields between planes during the demagnetization process, and decreases the concentration of magnetic induction intensity.

[0044] This device consists of three coils that are wound together. The three coils have the same basic configuration, and the direction and winding method of the coils are also the same. The three coils are the first demagnetizing coil 1, the second demagnetizing coil 2, and the third demagnetizing coil 3.

[0045] However, due to their different surrounding positions, the sizes of the first demagnetizing coil 1, the second demagnetizing coil 2, and the third demagnetizing coil 3 are all different.

[0046] Each demagnetizing coil can be wound around all six planes of the magnetic shielding box simultaneously, enabling demagnetization of all surfaces at the same time.

[0047] Two demagnetizing segments symmetrical along the diagonal on each plane originate from the same demagnetizing coil; therefore, two demagnetizing segments on the same plane constitute a coil group.

[0048] This invention plans to divide the three demagnetizing coils into a total of eighteen coil groups.

[0049] On each face of the square magnetic shielding box, there are six symmetrically distributed, parallel but not equidistant demagnetizing segments. Each demagnetizing segment is parallel to a diagonal of the winding surface and is symmetrically distributed along the diagonal.

[0050] The three demagnetizing coils can be divided into a total of thirty-six demagnetizing sections.

[0051] In addition, while increasing the number of coil groups, try to control the number of openings to reduce the impact of magnetic leakage caused by the openings on the demagnetization quality.

[0052] On each winding surface, the coils connect the demagnetizing sections on the inner and outer sides of the winding surface through openings in the winding surface. The coils on the inner and outer sides of the same section are parallel to each other, and the connecting line between the inner and outer parts of the same section is always perpendicular to the corresponding winding plane.

[0053] Each demagnetizing coil, after being wound, has two electrical terminals, which are connected to the positive and negative terminals of the power supply respectively to form a closed loop. Since each demagnetizing coil is a continuous unit, the current direction is consistent within the demagnetizing coil.

[0054] To better describe the winding sequence of the demagnetizing coils, we assign a serial number to each demagnetizing coil segment, and use the numbers 1, 2, 3, 4, 5, and 6 to represent the top, bottom, left, right, front, and back of the magnetic shielding box, respectively. We also use A and B to represent the two demagnetizing segments of each coil wound around each surface. Starting from the top side of the magnetic shielding box, the demagnetizing coil segments numbered 1-24 can be represented by the following labels:

[0055] 1: Top - Outside A; 2: Front - Inside A; 3: Left - Inside B; 4: Bottom - Outside A; 5: Front - Outside B;

[0056] 6: Right - Inside B; 7: Down - Inside B; 8: Back - Outside B; 9: Right - Outside A; 10: Up - Inside B;

[0057] 11: Back - Inside A; 12: Left - Outside A; 13: Left - Inside A; 14: Back - Outside A; 15: Top - Outside B;

[0058] 16: Right - Inside A; 17: Back - Inside B; 18: Down - Outside B; 19: Right - Outside B; 20: Front - Inside B;

[0059] 21: Down - Inside A; 22: Left - Outside B; 23: Front - Outside A; 24: Up - Inside A;

[0060] The numerical sequence indicates the order in which the coils are wound, and the number following each sequence indicates the position of that coil segment on the current winding surface.

[0061] The three demagnetizing coils are wound in the same order.

[0062] like Figure 3 As shown, the coil starts from the outside of the upper surface of the magnetic shielding box, connecting to the inside of the front surface via a through-hole (top-A). It continues to connect to the inside of the left surface (left-B), then to the outside of the lower surface (bottom-A) via a through-hole. It continues to connect to the outside of the front surface (front-B), then to the inside of the right surface (right-B) via a through-hole. It continues to connect to the inside of the lower surface (bottom-B), then to the outside of the rear surface (rear-B) via a through-hole. It continues to connect to the outside of the right surface (right-A), then to the inside of the upper surface (top-B) via a through-hole. It continues to connect to the inside of the rear surface (rear-A), then to the outside of the left surface (left-A) via a through-hole, completing the forward winding of this branch of the coil. Then, following the same steps, it connects to the inside of the left surface (left-A) via a through-hole. Then, it connects to the outside of the rear surface (rear-A) via a through-hole. It continues to connect to the outside of the upper surface (top-B), then to the inside of the right surface (right-A) via a through-hole. It continues to connect to the inside of the rear surface (rear-B), then to the outside of the lower surface (bottom-B) via a through-hole. Continue connecting the right-B outer side, then connect the front-B inner side through the through hole to enter the inner side of the front surface. Continue connecting the lower-A inner side, then connect the left-B outer side through the through hole to enter the outer side of the left surface. Continue connecting the front-A outer side, then connect the upper-A inner side through the through hole to enter the inner side of the upper surface, finally completing the reverse wrapping.

[0063] The three coils are wound around each face, and the straight-line distance from each coil segment to the diagonal is somewhat different; they are not evenly spaced.

[0064] Specifically, taking a magnetic shielding box with sides of 50cm as an example, the magnetic induction intensity is most uniform when the distances from the three sets of coils on each surface to the diagonal are 11cm, 17.5cm, and 30cm, respectively.

[0065] The demagnetizing coils are planned to be divided into 24 segments. The inner and outer sides of each segment are wound in the order described above. The inner and outer sides of each coil segment should be tightly attached to the wall of the magnetic shielding box.

[0066] Each demagnetizing coil is continuous. When connecting, attention should be paid to the current flow direction to ensure the continuity and closure of the magnetic circuit. It should be noted that, except for the second demagnetizing coil 2, since each segment of the first demagnetizing coil 1 and the third demagnetizing coil 3 is not necessarily interlocked, between two unconnected demagnetizing segments, this portion of the demagnetizing coil can be placed close to the edge line. For example... Figure 4As shown, the winding method of the second demagnetizing coil 2 and the third demagnetizing coil 3 is the same as that of the first demagnetizing coil 1. Since the two demagnetizing sections are not connected, some demagnetizing coils need to be set close to the edge line. Yellow represents the coils that need to be set close to the edge line during the forward stroke, and green represents the coils that need to be set close to the edge line during the reverse stroke.

[0067] As an optional implementation, the winding surface is provided with a through hole for threading the demagnetizing coil.

[0068] The wire guide hole is located on the winding surface and is positioned close to the edge line.

[0069] As an alternative implementation, the current directions in the demagnetizing sections symmetrically arranged on the inner and outer sides of the same winding surface are opposite.

[0070] As an alternative implementation, the magnetic shielding box is made of a material with high magnetic permeability.

[0071] The magnetic shielding box of the present invention is preferably made of permalloy.

[0072] As an optional implementation, the demagnetizing coil is made of copper wire.

[0073] As an optional implementation, the wire hole is a round hole.

[0074] As an optional implementation, the demagnetizing coil has a cross-sectional area of ​​28 mm². 2 .

[0075] As an optional implementation, the wall thickness of the magnetic shielding box is 3mm.

[0076] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0077] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A demagnetizing device with demagnetizing coils distributed diagonally, characterized in that, include: A magnetic shielding box, wherein the magnetic shielding box has a regular hexahedral structure and has six winding surfaces and twelve edges; At least one continuous demagnetizing coil is wound inside and outside the magnetic shielding box, wherein the magnetic shielding box divides the demagnetizing coil into several demagnetizing segments; The demagnetizing segments arranged on the inner and outer sides of the same winding surface are symmetrical; The demagnetizing segments on both sides of the same ridge are symmetrical.

2. The demagnetizing device with diagonally distributed demagnetizing coils according to claim 1, characterized in that: The demagnetizing coil is provided in three parts, namely the first demagnetizing coil (1), the second demagnetizing coil (2), and the third demagnetizing coil (3), which are arranged in parallel.

3. The demagnetizing device with diagonally distributed demagnetizing coils according to claim 1, characterized in that: The winding surface has a through hole for threading the demagnetizing coil.

4. The demagnetizing device with diagonally distributed demagnetizing coils according to claim 1, characterized in that: The current directions within the demagnetizing sections symmetrically arranged on the inner and outer sides of the same winding surface are opposite.

5. A demagnetizing device with diagonally distributed demagnetizing coils according to claim 1, characterized in that: The magnetic shielding box is made of a material with high magnetic permeability.

6. A demagnetizing device with diagonally distributed demagnetizing coils according to claim 1, characterized in that: The demagnetizing coil is made of copper wire.

7. A demagnetizing device with diagonally distributed demagnetizing coils according to claim 3, characterized in that: The wire hole is a round hole.

8. A demagnetizing device with diagonally distributed demagnetizing coils according to claim 1, characterized in that: The cross-sectional area of ​​the demagnetizing coil is 28 mm². 2 .

9. A demagnetizing device with diagonally distributed demagnetizing coils according to claim 1, characterized in that: The wall thickness of the magnetic shielding box is 3mm.

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