Powerful magnet with magnetic isolation layer

Abstract

The utility model relates to a powerful magnet with a magnetism isolating layer, which comprises a magnetic body and a magnetism isolating piece arranged on the magnetic body, the magnetism isolating piece is made of ferromagnetic materials, magnetic lines of force of the magnetic body are attached to the edge of the magnetism isolating piece to flow so as to reduce the number of magnetic lines of force penetrating through the magnetism isolating piece, and a connecting layer is arranged between the magnetic body and the magnetism isolating piece. And the connecting layer is used for limiting the relative displacement between the magnetic body and the magnetic isolation piece. According to the utility model, through the design of the magnetic isolation member, the leakage of magnetic lines at a certain side of the magnetic body is effectively reduced, the magnetic field intensity at a certain side or multiple sides of the magnetic body is enhanced according to an actual use scene, the magnetic performance of the magnetic body is further improved, and the adverse effect on electronic equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of magnets, and in particular discloses a strong magnet with a magnetic isolation layer. Background Art

[0002] With the rapid development of electronic technology, especially in the fields of computers, video recording, and communications equipment, the demand for miniaturization and high precision of equipment is increasing. Highly magnetic magnets play an important role in improving the read and write speed and accuracy of electronic devices. However, when using traditional strong magnets, their magnetic field is often difficult to accurately control, especially the difficulty in effectively shielding the magnetic field on one side of the magnet. This can lead to performance degradation of components within the device that are susceptible to magnetic field interference (such as motors and geomagnetic sensors), affecting the overall performance of the device. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a strong magnet with a magnetic isolation layer.

[0004] To achieve the above-mentioned purpose, the utility model provides a strong magnet with a magnetic isolation layer, comprising a magnetic body and a magnetic isolation part arranged on the magnetic body, wherein the magnetic isolation part is made of ferromagnetic material, and the magnetic lines of force of the magnetic body flow along the edge of the magnetic isolation part to reduce the number of magnetic lines of force passing through the magnetic isolation part, and a connecting layer is provided between the magnetic body and the magnetic isolation part, and the connecting layer is used to limit the relative displacement between the magnetic body and the magnetic isolation part.

[0005] Furthermore, the magnetic isolation member is a slot structure with a single-side opening or a sheet structure.

[0006] Furthermore, when the magnetic isolation member is a slot structure, the magnetic isolation member has an accommodating groove, the magnetic body is arranged in the accommodating groove, and one magnetic pole of the magnetic body is exposed in the opening of the accommodating groove of the magnetic isolation member.

[0007] Furthermore, when the magnetic isolation member is a sheet-like structure, the number of the magnetic isolation members is 1, 2, 3 or 4, and the magnetic isolation members are arranged on the side walls of the magnetic body.

[0008] Furthermore, there are multiple magnetic bodies, which are arranged in a Halbach array. The magnetic isolation member is covered on the multiple magnetic bodies so that the magnetic poles of the multiple magnetic bodies are exposed outside the magnetic isolation member.

[0009] Furthermore, the magnetic isolation member is made of one or more materials selected from iron, cobalt, and nickel through an integrated molding process.

[0010] Furthermore, the magnetic body is a strong magnet made of rare earth permanent magnet.

[0011] Furthermore, a conductive layer with a thickness of 0.001-0.05 mm is provided on the side wall of the magnetic isolation member away from the magnetic body.

[0012] Furthermore, the connecting layer is epoxy resin adhesive or metal alloy.

[0013] Furthermore, a movable partition is provided in the magnetic isolation member, and the partition is controlled to move back and forth relative to the magnetic isolation member via an external telescopic mechanism or electromagnetic device. The reciprocating partition is used to change the density of the magnetic field lines to adjust the magnitude of the magnetic force of the magnetic body.

[0014] The utility model utilizes the special structure (grooved or sheet-shaped) of a magnetic shield (made of ferromagnetic material) to guide the flow of magnetic lines of force. Due to the material properties and structural design of the magnetic shield, it is able to attract and redirect the magnetic lines of force of the magnetic body adjacent to it. This redistribution significantly increases the magnetic field strength in the area not covered by the magnetic shield, while the area of the magnetic body not covered by the magnetic shield has a reduced magnetic line density and thus weakened magnetism due to the magnetic lines of force being directed elsewhere. This design effectively reduces the leakage of magnetic lines of force, improves the magnetic field concentration and directionality of the magnet, and reduces the adverse effects of unilateral magnetic leakage on electronic equipment components. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a case where the magnetic isolation member is a slot structure;

[0016] Figure 2 This is a schematic diagram of the structure when the magnetic isolation components are distributed on both sides of the magnetic body;

[0017] Figure 3 This is a schematic diagram of the structure when the magnetic isolation member is located on one side of the magnetic body;

[0018] Figure 4 This is a cross-sectional view when the magnetic isolation member is located on one side of the magnetic body;

[0019] Figure 5 The magnetic field line distribution diagram of the magnetic body when the magnetic isolation member is located on one side of the magnetic body;

[0020] Figure 6 The magnetic field line distribution diagram of the magnetic body when the magnetic isolation members are located on both sides of the magnetic body;

[0021] Figure 7 This is a diagram showing the magnetic field line distribution when the magnetic body is accommodated in the magnetic isolation member of the slot structure.

[0022] Reference numerals include:

[0023] 1. Magnetic body; 2. Magnetic isolation member; 3. Connecting layer; 21. Accommodating groove; 22. Conductive layer. DETAILED DESCRIPTION

[0024] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0025] See also Figures 1 to 7 As shown, the utility model discloses a powerful magnet with a magnetic isolation layer, comprising a magnetic body 1 and a magnetic isolation member 2 disposed on the magnetic body 1. The magnetic isolation member 2 is made of ferromagnetic material. The magnetic lines of force of the magnetic body 1 flow along the edges of the magnetic isolation member 2 to reduce the number of magnetic lines of force passing through the magnetic isolation member 2. A connecting layer 3 is provided between the magnetic body 1 and the magnetic isolation member 2. The connecting layer 3 is used to limit the relative displacement between the magnetic body 1 and the magnetic isolation member 2. The presence of the connecting layer 3 ensures that the magnetic body 1 and the magnetic isolation member 2 do not undergo excessive relative displacement when affected by external forces, maintaining a fixed relative position between the two and avoiding affecting the stability and effectiveness of the magnetic field.

[0026] In the absence of the magnetic isolation member 2, the magnetic lines of force generated by the magnetic body 1 are widely distributed in the surrounding space, and the introduction of the magnetic isolation member 2 causes a part of the magnetic lines of force to be attracted and rearranged and flow along its edge, so that the other parts of the magnetic lines of force are more concentrated in the desired area, that is, the area not covered by the magnetic isolation member 2. The magnetic field strength in this area is thereby enhanced. The magnetic field shielding on one or more sides of the magnetic member is achieved. By rationally designing the magnetic isolation member 2, the magnetic force can be enhanced in a specific direction, increasing the effective utilization rate of the magnet. The application of the magnetic isolation member 2 makes the shape of the magnetic field more controllable, reduces the loss of magnetic force, and enables the magnet to play a greater role even in a small space.

[0027] In actual use, a ferromagnetic material with high saturation magnetization is used as the magnetic barrier 2 to ensure that it can effectively attract magnetic lines of force even in low impedance conditions. Depending on the application requirements, the size and shape of the magnetic barrier 2 (e.g., straight plate, ring, etc.) can be designed to optimize the flow path of the magnetic lines of force, concentrating the magnetic force in the desired direction or area. The connecting layer 3 uses an epoxy resin adhesive, which has excellent bonding and thermal conductivity, can withstand large mechanical stresses, and simplifies the assembly process of the two.

[0028] Specifically, the magnetic isolation member 2 is a trough structure with a single-sided opening or a sheet structure. In the actual production process, the trough structure or the sheet structure can be selected according to different needs. If it is necessary to concentrate the magnetic lines of force in a specific direction, a trough structure can be selected with the opening facing the direction where the magnetic field needs to be enhanced; if it is necessary to shield the magnetic field in multiple directions, a sheet structure can be used to cover these areas. Afterwards, an epoxy resin with high bonding strength and good thermal conductivity is used as the connecting layer 3 to connect the magnetic isolation member 2 and the magnetic body 1. Ensure that the coating is uniform and a firm connection is formed to prevent relative displacement between the magnetic isolation member 2 and the magnet.

[0029] Specifically, when the magnetic isolation member 2 is a slot structure, the magnetic isolation member 2 has a receiving groove 21, and the magnetic body 1 is arranged in the receiving groove 21, and one magnetic pole of the magnetic body 1 is exposed in the opening of the receiving groove 21 of the magnetic isolation member 2. The magnetic body 1 is placed in the receiving groove 21 of the magnetic isolation member 2, so that one magnetic pole of the magnetic body 1 (for example, the north pole) is exposed at the opening of the groove. The other pole (the south pole) is surrounded by the material of the magnetic isolation member 2. The material of the magnetic isolation member 2, through its high magnetic permeability, guides the magnetic lines of force in the direction of the exposed north pole. After being surrounded by the magnetic isolation member 2, most of the magnetic lines of force of the magnetic body 1 are attracted by the magnetic isolation member 2 and flow along its surface. These magnetic lines of force are guided to the exposed magnetic poles, causing the magnetic field to be concentrated in the direction of the opening of the magnetic isolation member 2, forming a strong directional magnetic field. The part of the magnetic isolation member 2 surrounding the magnetic body 1 effectively shields the magnetic field of the magnetic body 1 in other directions. This reduces unnecessary magnetic field diffusion, avoids interference with surrounding electronic equipment, and makes the magnetic field shape more controllable.

[0030] Specifically, when the magnetic isolation member 2 is a sheet-like structure, the number of the magnetic isolation members 2 is 1, 2, 3 or 4, and the magnetic isolation member 2 is arranged on the side wall of the magnetic body 1 .

[0031] When the magnetic field only needs to be shielded in one direction, a magnetic shield 2 can be set on one side wall of the magnetic body 1. This can prevent the magnetic lines of force from spreading in this direction and concentrate the magnetic field in other uncovered directions. For example, if the magnetic field needs to be concentrated in the up and down directions, a magnetic shield 2 can be added to one of the side walls. If the magnetic field needs to be shielded in two directions, a magnetic shield 2 can be set on each of the two opposite side walls. This configuration can effectively concentrate the magnetic field in the direction perpendicular to the plane of the magnetic shield 2 to form a strong magnetic field. This configuration is mainly used in applications where the magnetic field needs to be shielded in three directions while maintaining the magnetic field strength in only one direction. The three magnetic shields 2 can cover the three side walls of the magnetic body 1, and the uncovered direction is the area where the magnetic lines of force are mainly concentrated. When all four side walls are covered with magnetic shields 2, the magnetic lines of force will be mainly concentrated at the axial ends of the magnetic body 1. This configuration is suitable for applications that require a strong axial magnetic field, such as magnets used in rotating or axial transmission equipment.

[0032] By selectively providing a magnetic shield 2 on the side wall of the magnetic body 1, it is possible to shield unwanted magnetic field directions and concentrate the magnetic field in the desired direction. This design is particularly suitable for applications that require enhanced magnetic fields in specific directions, such as magnetic sensors, magnetic levitation devices, precision positioning equipment, etc. The magnetic shield 2 is simple in design and easy to install, and its sheet-like structure is easy to adjust according to actual applications. Its number (1, 2, 3 or 4) and specific location can be customized according to needs, thereby achieving highly flexible magnetic field control. This flexibility enables it to adapt to a variety of industrial application scenarios.

[0033] Specifically, the plurality of magnetic bodies 1 are arranged in a Halbach array, with the magnetic shield 2 covering the plurality of magnetic bodies 1 so that the magnetic poles of the plurality of magnetic bodies 1 are exposed outside the magnetic shield 2. The Halbach array is a specially arranged permanent magnet structure in which the magnetization directions of the magnets rotate sequentially, thereby enhancing the magnetic field on one side of the array and weakening the field on the other side. This arrangement utilizes the interaction between the magnets to produce a very uniform and highly directional magnetic field.

[0034] Specifically, multiple magnetic bodies 1 can be in the form of bars, circles, or other shapes, arranged at specific angles and spacings to form a Halbach array, depending on the application requirements. The magnetization direction of each magnetic body 1 is rotated relative to the adjacent magnetic bodies 1 by a certain angle, typically 90° or another designed angle. The Halbach array design, combined with the use of magnetic isolation elements 2, significantly enhances the strength and directionality of the magnetic field, making it more concentrated and uniform.

[0035] Specifically, the magnetic isolation member 2 is made of one or more of iron, cobalt, and nickel and is made through an integrated molding process. Iron, cobalt, and nickel are commonly used magnetic materials with high magnetic permeability and good mechanical properties. These materials can be used alone or alloyed to obtain optimal magnetic and mechanical properties. Through alloying, the magnetic permeability of the magnetic isolation member 2 can be made higher, which can more effectively guide the magnetic lines of force of the magnetic body 1 and further play the role of the magnetic isolation member 2. The integrated molding process allows the design and manufacture of complex-shaped magnetic isolation members 2, increases the flexibility of the design, and enables the magnetic isolation member 2 to better adapt to complex magnetic body 1 arrays and equipment structures. The one-piece molded magnetic isolation member 2 has better structural integrity, reduces the risk of failure due to connection and assembly, and improves the reliability and durability of the overall equipment.

[0036] Specifically, the magnetic body 1 is a powerful magnet made of rare earth permanent magnets. During actual production, rare earth elements are first mixed with materials such as iron, boron, and cobalt in precise proportions. These materials are then melted at high temperatures through induction melting or arc melting to form an alloy. After melting, the alloy is cooled and cast into an ingot. The ingot is then crushed into powder and solidified into a billet through a sintering process. During the sintering process, an external magnetic field is applied to determine the magnetic orientation of the billet. The billet is then machined into a specific shape. After machining, a strong external magnetic field is applied again to align all magnetic regions of the material in the same direction. Finally, after surface treatment, the desired powerful magnet is obtained. Since rare earth permanent magnets are made of neodymium iron boron (NdFeB) and samarium cobalt (SmCo), SmCo magnets are particularly stable at high temperatures and in harsh environments, making them suitable for use in harsh working conditions. This makes the magnetic body have extremely high magnetic energy product and stable magnetism, and multiple magnetic bodies 1 are arranged at specific angles to form a Halbach array, which maximizes the directionality and intensity of the output magnetic field.

[0037] Specifically, the side wall of the magnetic isolation member 2 away from the magnetic body 1 is provided with a conductive layer 22 with a thickness of 0.001-0.05 mm. The conductive layer 22 can be made of a highly conductive metal film such as copper, aluminum, silver, etc. and uniformly covered on the surface of the magnetic isolation member 2 away from the magnetic body 1 by sputtering, electroplating or evaporation. The main function of the conductive layer 22 is to shield external electromagnetic interference, and to reduce the eddy current caused by the change in the magnetic field to a minimum, thereby reducing energy loss. The thin film design of the conductive layer 22 will neither significantly increase the weight nor affect the overall structural strength of the magnetic isolation member 2. In addition, the conductive layer 22 can also provide a certain degree of anti-corrosion protection, thereby extending the service life of the magnetic isolation member 2.

[0038] When making the magnetic isolation member 2, first, raw material powders such as iron, cobalt, and nickel are mixed in a specific proportion and pressed into shape, and then sintered at high temperature to form a dense magnetic isolation member 2; secondly, the magnetic isolation member 2 is mechanically processed (such as laser cutting, welding, etc.) to make it into a specific shape; then, the mechanically processed magnetic isolation member 2 is heat-treated to improve its internal crystal structure; finally, the surface of the magnetic isolation member 2 is plated (conductive layer), and the plated magnetic isolation member 2 can be used as a magnetic isolation layer of a strong magnet.

[0039] Specifically, the connecting layer 3 is an epoxy resin adhesive or a metal alloy. A thermally conductive epoxy resin adhesive is used to fix the magnetic isolation member 2 and the magnetic body 1. Epoxy resin has good adhesion, mechanical strength and heat resistance, and can reliably fix the magnetic isolation member 2 on the magnetic body 1. A low-melting-point metal alloy (such as indium, tin-based alloy) is used as the connecting layer 3, and a tight bond is achieved through hot-melt welding technology. This connection method can achieve high-strength fixation at a lower temperature while having excellent thermal conductivity. Whether it is epoxy resin or metal alloy, it can provide a high-strength connection to prevent the magnetic isolation member 2 from loosening or shifting during use. The thermal conductivity of the connecting layer 3 helps to dissipate heat quickly and prevent the magnetic body 1 and the magnetic isolation member 2 from affecting performance due to overheating.

[0040] Specifically, a movable partition (not shown in the figure) is provided in the magnetic isolation member 2, and the partition is controlled to move back and forth relative to the magnetic isolation member 2 via an external telescopic mechanism or an electromagnetic device. The reciprocating partition is used to change the density of the magnetic lines of force in the magnetic field to adjust the magnitude of the magnetic force of the magnetic body 1. The partition can be made of high magnetic permeability materials such as iron-nickel alloys and cobalt-based materials. The design of the partition is intended to change the distribution of magnetic lines of force in the magnetic field of the magnetic body 1, thereby adjusting the strength of the magnetic field. The external telescopic mechanism can be a mechanical (such as a spiral drive, hydraulic) or electromagnetic device, which can achieve dynamic adjustment of the magnetic field density by precisely controlling the reciprocating control of the partition.

[0041] The movement of the spacer can change the density of magnetic field lines, thereby adjusting the magnetic field strength. For example, when the spacer is close to one of the magnetic poles of magnetic body 1, the magnetic field lines in that area are concentrated, increasing the magnetic field strength. When the spacer is away from one of the magnetic poles of magnetic body 1, the magnetic field lines in that area are dispersed, decreasing the magnetic field strength. By adjusting the position of the spacer, the magnetic field strength can be precisely controlled, making it suitable for applications requiring a variable magnetic field, such as precision machining and magnetic drive devices.

[0042] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A strong magnet with a magnetic isolation layer, characterized in that: The invention comprises a magnetic body (1) and a magnetic isolation member (2) arranged on the magnetic body (1), wherein the magnetic isolation member (2) is made of ferromagnetic material, and the magnetic isolation member (2) is used to attract the magnetic lines of force of the magnetic field of the magnetic body (1) to flow along the edge of the magnetic isolation member (2) to reduce the number of magnetic lines of force passing through the magnetic isolation member (2), and the magnetism of the side of the magnetic body (1) away from the magnetic isolation member (2) is enhanced under the action of the magnetic isolation member (2); a connecting layer (3) is provided between the magnetic body (1) and the magnetic isolation member (2), and the connecting layer (3) is used to limit the relative displacement between the magnetic body (1) and the magnetic isolation member (2).

2. The strong magnet with a magnetic isolation layer according to claim 1, characterized in that: The magnetic isolation member (2) is a slot structure with a single-side opening or a sheet structure.

3. The strong magnet with a magnetic isolation layer according to claim 2, characterized in that: When the magnetic isolation member (2) is a slot structure, the magnetic isolation member (2) has an accommodating groove (21), the magnetic body (1) is arranged in the accommodating groove (21), and one magnetic pole of the magnetic body (1) is exposed in the opening of the accommodating groove (21) of the magnetic isolation member (2).

4. The strong magnet with a magnetic isolation layer according to claim 2, characterized in that: When the magnetic isolation member (2) is a sheet-like structure, the number of the magnetic isolation members (2) is 1, 2, 3 or 4, and the magnetic isolation member (2) is arranged on the side wall of the magnetic body (1).

5. The strong magnet with a magnetic isolation layer according to claim 1, characterized in that: The number of the magnetic bodies (1) is multiple, and the multiple magnetic bodies (1) are arranged in a Halbach array. The magnetic isolation member (2) is covered on the multiple magnetic bodies (1) so that the magnetic poles of the multiple magnetic bodies (1) are exposed outside the magnetic isolation member (2).

6. The strong magnet with a magnetic isolation layer according to claim 1, characterized in that: The magnetic isolation member (2) is made of one or more of iron, cobalt and nickel.

7. The strong magnet with a magnetic isolation layer according to claim 1, characterized in that: The magnetic body (1) is a strong magnet made of rare earth permanent magnet.

8. The strong magnet with a magnetic isolation layer according to claim 1, characterized in that: A conductive layer (22) with a thickness of 0.001-0.05 mm is provided on the side wall of the magnetic isolation member (2) away from the magnetic body (1).

9. The strong magnet with a magnetic isolation layer according to claim 1, characterized in that: The connecting layer (3) is an epoxy resin adhesive or a metal alloy.

10. The strong magnet with a magnetic isolation layer according to claim 1, characterized in that: A movable partition is provided in the magnetic isolation member (2), and the partition is controlled to move back and forth relative to the magnetic isolation member (2) via an external telescopic mechanism or an electromagnetic device. The reciprocating partition is used to change the density of the magnetic field lines to adjust the magnitude of the magnetic force of the magnetic body (1).

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