Magnetic field correction device

Abstract

The present invention discloses a magnetic field concentration correction device, which is applied to the correction of magnetic field lines of iron-based or cobalt-based nanocrystalline magnetic cores; it includes a magnetic field device for providing a magnetic field, a tubular heating furnace, a fixed frame, two first magnetic concentration plates, two second magnetic concentration plates and at least one correction unit for correcting magnetic field lines; the fixed frame is in a strip shape, the fixed frame is arranged in the heating furnace, the length direction of the fixed frame is arranged along the length direction of the heating furnace, the two first magnetic concentration plates are respectively arranged at the two ends of the heating furnace, the two second magnetic concentration plates are respectively arranged at the two ends of the fixed frame, the first magnetic concentration plate and the second magnetic concentration plate are parallel and opposite, the area of ​​the first magnetic concentration plate is larger than the area of ​​the second magnetic concentration plate, and the correction unit is arranged in the fixed frame. The present invention is applied to the field of magnetic core technology.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic cores, and in particular to a magnetic field line focusing and correction device. Background Art

[0002] When the iron-based or cobalt-based nanocrystalline magnetic core is magnetized in the same direction, the magnetic domains of the magnetic core are arranged in parallel, and the hysteresis loop of the magnetic core tends to be flattened. The magnetic characteristic parameters of the magnetic core have the advantages of small remanence Br, small coercive force Hc, and low magnetic loss Ps.

[0003] In response to the above requirements, the iron-based or cobalt-based nanocrystalline magnetic core needs to be corrected, but the magnetic lines of force of the magnetic field are arc-shaped. If the magnetic core is corrected directly, the magnetic domains of the core cannot be corrected to be parallel. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] A magnetic field line focusing correction device solves the technical problem that the magnetic domains of an iron-based or cobalt-based nanocrystalline magnetic core cannot be corrected to be parallel when correcting the core.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a magnetic field line concentration correction device, which is applied to the correction of magnetic field lines of iron-based or cobalt-based nanocrystalline magnetic cores;

[0008] It includes a magnetic field device for providing a magnetic field, a tubular heating furnace, a fixing frame, two first magnetic focusing plates, two second magnetic focusing plates and at least one correction unit for correcting magnetic lines of force;

[0009] The fixed frame is in a bar shape and is arranged in the heating furnace. The length direction of the fixed frame is arranged along the length direction of the heating furnace. The two first magnetic focusing plates are respectively arranged at the two ends of the heating furnace, and the two second magnetic focusing plates are respectively arranged at the two ends of the fixed frame. The first magnetic focusing plate and the second magnetic focusing plate are parallel and opposite to each other. The area of ​​the first magnetic focusing plate is larger than the area of ​​the second magnetic focusing plate, and the correction unit is arranged in the fixed frame.

[0010] Further improved, the area ratio of the first magnetic focusing plate and the heating furnace diameter is 92% to 98%, the area ratio of the second magnetic focusing plate to the first magnetic focusing plate is 90% to 95%, and the area ratio of the second magnetic focusing plate to the cross-section of the fixed frame is 110% to 100%.

[0011] Further improved, at least one third magnetic focusing plate is provided between the first magnetic focusing plate and the second magnetic focusing plate, the third magnetic focusing plate is parallel to and opposite to the first magnetic focusing plate and the second magnetic focusing plate, and the area of ​​the third magnetic focusing plate is smaller than the first magnetic focusing plate and larger than the second magnetic focusing plate;

[0012] When there are multiple third magnetic focusing plates, the areas of the third magnetic focusing plates decrease gradually from the first magnetic focusing plate to the second magnetic focusing plate.

[0013] As a further improvement, the materials of the first magnetic focusing plate, the second magnetic focusing plate and the third magnetic focusing plate are respectively any one of iron, cobalt and nickel.

[0014] As a further improvement, the materials of the first magnetic focusing plate, the second magnetic focusing plate and the third magnetic focusing plate are respectively DT4 pure iron.

[0015] As a further improvement, the thicknesses of the first magnetic focusing plate, the second magnetic focusing plate and the third magnetic focusing plate are respectively 5 mm to 10 mm.

[0016] As a further improvement, the heating furnace is in the shape of a circular tube, and the cross-sections of the first magnetic focusing plate, the second magnetic focusing plate and the fixing frame are respectively circular.

[0017] As a further improvement, the correction unit comprises at least two iron correction pieces, the shape of the correction pieces is the same as the shape of the magnetic core to be corrected, and the thickness of the correction pieces is 20 mm to 30 mm.

[0018] As a further improvement, the correction unit further comprises a non-magnetic fixing rod, the correction piece and the magnetic core to be corrected are both annular, and the correction piece and the magnetic core to be corrected are sleeved on the fixing rod.

[0019] As a further improvement, the number of the correcting pieces is two, and the correcting pieces are made of DT4 pure iron.

[0020] (III) Beneficial effects

[0021] The magnetic field line concentration correction device of the present invention can correct the iron-based or cobalt-based nanocrystalline magnetic core, and can correct the magnetic domain of the magnetic core to be parallel, with simple operation, high correction efficiency and low correction cost. Among them, the function of the first magnetic concentration plate is to initially collect and concentrate the magnetic field lines generated by the coil into the heating furnace, and the second magnetic concentration plate is to concentrate the magnetic field lines of the first magnetic concentration plate. For example, the density of the magnetic field lines generated by the coil is B0. After being collected and concentrated by the first magnetic concentration plate, since the first magnetic concentration plate is placed in the heating furnace, the area of ​​the first magnetic concentration plate will be slightly smaller than or equal to the caliber of the heating furnace. The density of the magnetic field lines from the first magnetic concentration plate is B1, and the density of the magnetic field lines from the second magnetic concentration plate is B2, then B2>B1>B0. Thereby, the density of the magnetic field lines applied to the correction unit and the magnetic core is increased, and the magnetic field strength H is increased. A stronger magnetic field is provided to the magnetic core that needs to be magnetized, and the magnetic characteristic parameters of the magnetic core are further improved. Through the magnetic focusing effect of the first magnetic focusing plate and the second magnetic focusing plate, the magnetic domains of the magnetic core are made more parallel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a structural schematic diagram of the magnetic field line focusing correction device during correction in one embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of a correction unit in one embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the magnetic domain distribution of the magnetic core to be corrected before magnetization correction in one embodiment of the present invention;

[0025] Figure 4 A schematic diagram of magnetic domain distribution after core magnetization correction in one embodiment of the present invention;

[0026] Figure 5 is a hysteresis loop of a magnetic core before magnetization correction in one embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the magnetization curve of the magnetic core after magnetization correction in one embodiment of the present invention. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Please refer to Figures 1 to 6, a magnetic field line focusing correction device, used for the magnetic field line focusing correction of iron-based or cobalt-based nanocrystalline magnetic cores, comprising a magnetic field device for providing a magnetic field, a tubular heating furnace 1, a fixing frame 2, two first magnetic focusing plates 3, two second magnetic focusing plates 4 and at least one correction unit 5 for correcting magnetic field lines;

[0032] The fixed frame 2 is strip-shaped and is arranged in the heating furnace 1. The length direction of the fixed frame 2 is arranged along the length direction of the heating furnace 1. Two first magnetic focusing plates 3 are respectively arranged at the two ends of the heating furnace 1, and two second magnetic focusing plates 4 are respectively arranged at both ends of the fixed frame 2. The first magnetic focusing plate 3 and the second magnetic focusing plate 4 are parallel and opposite to each other. The area of ​​the first magnetic focusing plate 3 is larger than the area of ​​the second magnetic focusing plate 4. The correction unit 5 is arranged in the fixed frame 2.

[0033] The correction method of the magnetic field line correction device of this embodiment is as follows: the magnetic core 6 to be corrected is placed in the correction unit 5, and the heating furnace 1 is heated to 450℃~570℃, so that the magnetic core 6 to be corrected is fully heated and kept warm; then the coil 8 is used to apply a magnetic field to the magnetic core 6, so that the magnetic field lines 81 generated by the coil 8 pass through the first magnetic plate 3, the second magnetic plate 4, and the correction unit 5 at both ends of the heating furnace 1 to the magnetic core 6 in turn, and the magnetic core 6 is corrected by the magnetic concentration of the magnetic plate 3 and the second magnetic plate 4 and the correction unit 5, and the magnetic domains 61 in the magnetic core 6 are corrected to be parallel. After the correction is completed, the temperature in the heating furnace 1 is reduced to below 350℃, so that the magnetic domains 2 in the magnetic core 2 tend to be stable.

[0034] The magnetic field line concentration correction device of this embodiment can correct the iron-based or cobalt-based nanocrystalline magnetic core 6, and can correct the magnetic domain 21 of the magnetic core 2 to be parallel, with simple operation, high correction efficiency and low correction cost. Among them, the function of the first magnetic concentration plate 3 is to initially collect and gather the magnetic field lines generated by the coil 8 into the heating furnace 1, and the second magnetic concentration plate 4 is to gather the magnetic field lines 81 of the first magnetic concentration plate 3. For example, the density of the magnetic field lines 81 generated by the coil 8 is B0. After being collected and gathered by the first magnetic concentration plate 3, since the first magnetic concentration plate 3 is placed in the heating furnace 1, the area of ​​the first magnetic concentration plate 3 will be slightly smaller than or equal to the diameter of the heating furnace 1. The density of the magnetic field lines 81 from the first magnetic concentration plate 3 is B1, and the density of the magnetic field lines 81 from the second magnetic concentration plate 4 is B2, then B2>B1>B0. Thereby, the density of the magnetic field lines applied to the correction unit 5 and the magnetic core 6 is increased, and the magnetic field strength H is increased. A stronger magnetic field is provided to the magnetic core 6 to be magnetized, and the magnetic characteristic parameters of the magnetic core 6 are further improved. Through the magnetic focusing effect of the first magnetic focusing plate 3 and the second magnetic focusing plate 4, the magnetic domains 61 of the magnetic core 6 are made more parallel.

[0035] Specifically, the method for judging whether the magnetic core 6 has been corrected is as follows: testing the magnetic core 6 close to the correcting piece 51, testing its magnetic parameters, magnetic permeability, hysteresis loop and other data; if it is judged that the magnetic core 6 close to the correcting piece 51 has been corrected, then all the magnetic cores 6 have been corrected.

[0036] It should be pointed out that if the first magnetic concentrator plate 3 and the second magnetic concentrator plate 4 are not provided, the correction unit 5 can also correct the magnetic core 6, but the correction effect is not so good. The purpose of magnetic concentrator is to gather the large-area discrete magnetic lines of force 81. The area of ​​the first magnetic concentrator plate 3 and the second magnetic concentrator plate 4 is reduced in a step-by-step manner. In this way, the density of the magnetic lines of force 81 is increased, and the increase in the magnetic flux density increases the magnetic field strength applied to the magnetic core 6, and the effect on the parallel arrangement of the magnetic domains 61 of the magnetic core 6 is greater.

[0037] Secondly, in this embodiment, other magnetic field devices may be used to apply the magnetic field, not limited to the coil 8 .

[0038] Furthermore, in one embodiment, the area ratio of the first magnetic focusing plate 3 to the caliber of the heating furnace 1 is 92% to 98%, the area ratio of the second magnetic focusing plate 4 to the first magnetic focusing plate 3 is 90% to 95%, and the area ratio of the second magnetic focusing plate 4 to the cross section of the fixed frame 2 is 110% to 100%. Specifically, the area of ​​the first magnetic focusing plate 3 is 95% of the caliber of the heating furnace 1, the first magnetic focusing plate 3 is placed in the port of the heating furnace 1, and the area of ​​the second magnetic focusing plate 4 is 80% of the area of ​​the first magnetic focusing plate 3. Under this area ratio, the mass production quantity of the magnetic core 6 during correction is guaranteed, and the magnetic focusing effect is also satisfied. Specifically, the fixed frame 2 can be circular or cylindrical, and multiple correction units 5 can be placed in the fixed frame 2 to facilitate mass production. Assuming that the magnetic field lines 81 generated by the coil 8 are 1 T, the magnetic field lines 81 from the first magnetic focusing plate 3 are B1=1 / 0.95, which is 1.05 T, and the magnetic field lines 81 from the second magnetic focusing plate 4 are B2=1 / 0.8, which is 1.25 T. That is, through the action of the first magnetic focusing plate 3 and the second magnetic focusing plate 4, the magnetic flux density B2 applied to the correction unit 5 and the magnetic core 6 is increased to 1.25 times.

[0039] Furthermore, in one embodiment, at least one third magnetic focusing plate is provided between the first magnetic focusing plate 3 and the second magnetic focusing plate 4, the third magnetic focusing plate is parallel to and opposite to the first magnetic focusing plate 3 and the second magnetic focusing plate 4, and the area of ​​the third magnetic focusing plate is smaller than the first magnetic focusing plate 3 and larger than the second magnetic focusing plate 4;

[0040] When there are multiple third magnetic concentrators, the areas of the third magnetic concentrators decrease in sequence from the first magnetic concentrator 3 to the second magnetic concentrator 4. A stepped decreasing third magnetic concentrator can also be provided according to actual needs.

[0041] Furthermore, in one embodiment, the materials of the first magnetic focusing plate 3, the second magnetic focusing plate 4 and the third magnetic focusing plate are any one of iron, cobalt and nickel respectively. Since cobalt and nickel are relatively expensive, preferably, the first magnetic focusing plate 3, the second magnetic focusing plate 4 and the third magnetic focusing plate are iron.

[0042] Furthermore, in one embodiment, the materials of the first magnetic focusing plate 3, the second magnetic focusing plate 4 and the third magnetic focusing plate are respectively DT4 pure iron, which is cheap and has good magnetic focusing effect.

[0043] Furthermore, in one embodiment, the thickness of the first magnetic focusing plate 3, the second magnetic focusing plate 4 and the third magnetic focusing plate are 5 mm to 10 mm respectively. Preferably, the thickness of the first magnetic focusing plate 3, the second magnetic focusing plate 4 and the third magnetic focusing plate are 5 mm respectively.

[0044] Furthermore, in one embodiment, the heating furnace 1 is in a cylindrical shape, and the cross-sections of the first magnetic focusing plate 3, the second magnetic focusing plate 4 and the fixing frame 2 are respectively circular.

[0045] Furthermore, in one embodiment, the correction unit 5 includes at least two iron correction pieces 51, the shape of the correction piece 51 is the same as the shape of the magnetic core to be corrected, and the thickness of the correction piece 51 is 20 mm to 30 mm. When the thickness of the correction piece 51 is 20 mm, the correction effect is best, the material utilization rate of the correction piece 51 used is the highest, the cost performance is the best, and the economy is the best. The correction method of the correction unit 5 is: by making the iron correction piece 51 into the same shape as the magnetic core 6 to be corrected, when correcting, each magnetic core 6 to be corrected is placed between the correction pieces 51, and the magnetic lines of force 81 pass through the second magnetic concentrator plate 4 and then pass through the correction piece 51 and the magnetic core 6 to be corrected in turn, so that the magnetic lines of force 81 passing through the magnetic core 6 can be parallelized, and when correcting the magnetic core 6, the magnetic domains 61 in the magnetic core 6 can be parallelized.

[0046] A plurality of correction units 5 can be placed in the fixing frame 2, and a plurality of magnetic cores 6 to be corrected can be placed between the correction pieces 51 of each correction unit 5, so that a plurality of magnetic cores 6 to be corrected can be corrected at the same time, and batch correction can be realized with high correction efficiency. Figure 3 to Figure 4 As shown, the magnetic domains 61 of the magnetic core 6 before correction are disordered, but after correction by the correction method for the magnetic field lines 81 of the iron-based or cobalt-based nanocrystalline magnetic core of this embodiment, the magnetic domains 61 in the magnetic core 6 tend to be parallel.

[0047] Furthermore, in one embodiment, the correction unit 5 further includes a non-magnetic fixing rod 52, the correction piece 51 and the magnetic core to be corrected are both annular, and the correction piece 51 and the magnetic core to be corrected are sleeved on the fixing rod 52. Preferably, the correction piece 51 and the magnetic core to be corrected are annular, and the fixing rod 52 is a round rod.

[0048] Furthermore, in one embodiment, the number of the correcting pieces 51 is two. In the specific correction process, only two correcting pieces 51 are needed. If more than two correcting pieces 51 are provided, the magnetic core 2 to be corrected can of course also be corrected, but this also causes unnecessary waste. The correcting piece 51 is made of DT4 pure iron. The first magnetic collecting plate 3, the second magnetic collecting plate 4, the third magnetic collecting plate and the correcting piece 51 of this embodiment can all be made of DT4 pure iron, but the first magnetic collecting plate 3, the second magnetic collecting plate 4, and the third magnetic collecting plate function to collect magnetism, and the correcting piece 51 functions to correct. The difference between their functions is that the thickness range of the correcting piece 51 is different from the thickness range of the first magnetic collecting plate 3, the second magnetic collecting plate 4, and the third magnetic collecting plate.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A magnetic field correction device, It is characterized in that Applied to the correction of magnetic field lines of iron-based or cobalt-based nanocrystalline magnetic cores; It includes a magnetic field device for providing a magnetic field, a tubular heating furnace, a fixing frame, two first magnetic focusing plates, two second magnetic focusing plates and at least one correction unit for correcting magnetic lines of force; The fixing frame is in a strip shape, and is arranged in the heating furnace. The length direction of the fixing frame is arranged along the length direction of the heating furnace. Two first magnetic focusing plates are respectively arranged at two ends of the heating furnace, and two second magnetic focusing plates are respectively arranged at two ends of the fixing frame. The first magnetic focusing plate and the second magnetic focusing plate are parallel and opposite to each other, and the area of ​​the first magnetic focusing plate is larger than that of the second magnetic focusing plate. The correction unit is arranged in the fixing frame; The area ratio of the first magnetic concentrator plate to the heating furnace diameter is 92% to 98%, the area ratio of the second magnetic concentrator plate to the first magnetic concentrator plate is 90% to 95%, and the area ratio of the second magnetic concentrator plate to the cross section of the fixing frame is 110% to 100%; At least one third magnetic focusing plate is further provided between the first magnetic focusing plate and the second magnetic focusing plate, the third magnetic focusing plate is parallel to and opposite to the first magnetic focusing plate and the second magnetic focusing plate, and the area of ​​the third magnetic focusing plate is smaller than the first magnetic focusing plate but larger than the second magnetic focusing plate; When there are multiple third magnetic concentrating plates, the areas of the third magnetic concentrating plates decrease in sequence from the first magnetic concentrating plate to the second magnetic concentrating plate; The correction unit comprises at least two iron correction pieces, the shapes of the correction pieces are the same as the shape of the magnetic core to be corrected, and are respectively located at two ends of the magnetic core to be corrected; the thickness of the correction pieces is 20 mm to 30 mm.

2. The magnetic field concentration correction device according to claim 1, It is characterized in that The materials of the first magnetic focusing plate, the second magnetic focusing plate and the third magnetic focusing plate are respectively any one of iron, cobalt and nickel.

3. The magnetic field correction device according to claim 2, It is characterized in that The materials of the first magnetic focusing plate, the second magnetic focusing plate and the third magnetic focusing plate are DT4 pure iron respectively.

4. The magnetic field correction device according to claim 1, It is characterized in that The thicknesses of the first magnetic focusing plate, the second magnetic focusing plate and the third magnetic focusing plate are 5 mm to 10 mm respectively.

5. The magnetic field concentration correction device according to claim 1, It is characterized in that The heating furnace is in the shape of a circular tube, and the cross sections of the first magnetic focusing plate, the second magnetic focusing plate and the fixing frame are respectively circular.

6. The magnetic field concentration correction device according to claim 1, It is characterized in that The correction unit also includes a non-magnetic fixing rod. The correction piece and the magnetic core to be corrected are both annular in shape. The correction piece and the magnetic core to be corrected are sleeved on the fixing rod.

7. The magnetic field concentration correction device according to claim 1, It is characterized in that The number of the correcting pieces is two, and the correcting pieces are made of DT4 pure iron.

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