Magnetic field applying device and three-phase three-dimensional core annealing apparatus

Abstract

The application relates to a magnetic field applying device and a three-phase three-dimensional core annealing furnace. The magnetic field applying device is arranged in the three-phase three-dimensional core annealing furnace to apply a direct-current magnetic field. The magnetic field applying device comprises a plurality of conductive members which are electrically connected to each other to form a first magnetic field applying circuit and a second magnetic field applying circuit which is sleeved in the first magnetic field applying circuit. The first magnetic field applying circuit and the second magnetic field applying circuit are connected in series with each other, and the current flow directions of the two through the same core window are consistent. In this way, the plurality of windows arranged in the three-dimensional space of the plurality of three-phase three-dimensional cores can be applied with the magnetic field by the conductive members. When the first magnetic field applying circuit and the second magnetic field applying circuit pass through the same window at the same time, the flow directions of the first magnetic field applying circuit and the second magnetic field applying circuit in the same window are consistent, and the magnetic field directions formed by the first magnetic field applying circuit and the second magnetic field applying circuit are consistent. The magnetic field directions are prevented from being opposite and being offset, so that the three-phase three-dimensional core can obtain a better magnetic domain orientation.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a magnetic field application device and a three-phase three-dimensional iron core annealing equipment. Background Technology

[0002] With the development of transformer technology, the distribution transformers used in power grids mainly include silicon steel distribution transformers and amorphous distribution transformers. Among them, amorphous distribution transformers have 80% lower no-load losses than silicon steel distribution transformers and have gradually become the mainstream product in the market. Amorphous alloys are solidified by ultra-rapid cooling. During the solidification process, the atoms do not have enough time to arrange themselves in an orderly manner to crystallize, resulting in a solid alloy with a long-range disordered structure. The molecules (or atoms, ions) that make up the alloy do not exhibit spatial regularity and periodicity, and there are no grains or grain boundaries like in crystalline alloys. This type of amorphous alloy has many unique properties, and due to its excellent performance and simple processing, it has gradually become a key research and development focus in materials science.

[0003] To obtain amorphous alloy cores with good magnetic properties and eliminate internal stress, magnetic field heat treatment is required on the wound core. During annealing, a magnetic field is applied to the core to significantly improve its magnetic properties. However, in related technologies, the magnetic fields applied to the core may cancel each other out, failing to achieve optimal magnetic domain orientation. Summary of the Invention

[0004] Therefore, it is necessary to provide a magnetic field application device and a three-phase three-dimensional iron core annealing furnace to address the problem of not being able to obtain good magnetic domain orientation.

[0005] A magnetic field applying device is provided in an annealing furnace for a three-phase three-dimensional iron core to apply a DC magnetic field. The magnetic field applying device includes:

[0006] Multiple conductive components are electrically connected to each other to form a first magnetic field application circuit and a second magnetic field application circuit sleeved within the first magnetic field circuit.

[0007] The first magnetic field application circuit and the second magnetic field application circuit are connected in series and the current flowing through the same iron core window is in the same direction.

[0008] The aforementioned magnetic field application device is installed in an annealing furnace. During the annealing process, if the volume of the three-phase three-dimensional iron core is suitable, multiple three-phase three-dimensional iron cores will be placed in the annealing furnace for simultaneous magnetic field heat treatment. Multiple conductive components are interconnected to apply the magnetic field, forming a first magnetic field application circuit and a second magnetic field application circuit that are nested together. In this way, multiple windows of multiple three-phase three-dimensional iron cores arranged in three-dimensional space can be filled with conductive components to apply the magnetic field. When the first magnetic field application circuit and the second magnetic field application circuit pass through a certain window at the same time, the flow direction of the first magnetic field application circuit and the second magnetic field application circuit in the same window is consistent, thus forming a consistent magnetic field direction. This prevents the magnetic field directions from being opposite and canceling each other out, so that the three-phase three-dimensional iron core can obtain better magnetic domain orientation.

[0009] In one embodiment, the annealing furnace is provided with four three-phase three-dimensional iron cores arranged in two rows and two columns;

[0010] The conductive element includes four components. Two of the four conductive elements are connected end to end to form the second magnetic field application circuit. The other two of the four conductive elements are disposed opposite each other on both sides of the second magnetic field application circuit and are electrically connected to each other to form the first magnetic field application circuit.

[0011] The second magnetic field applying circuit passes through a portion of the windows in each of the three-phase solid iron cores, while the first magnetic field applying circuit passes through at least the remaining windows in each of the three-phase solid iron cores.

[0012] In one embodiment, each conductive element includes a middle section and a first section and a tail section located at opposite ends of the middle section. The first section and the tail section are both bent toward the same side of the middle section and a bending opening is defined between them. Two of the four conductive elements have two bending openings facing each other, and the two conductive elements are connected to each other and the two bending openings are merged to form an annular cavity. The two bending openings of the other two conductive elements are located on opposite sides of the annular cavity and are arranged back to back.

[0013] In one embodiment, each of the three-phase three-dimensional iron cores has a first window, a second window, and a third window. The two second windows of two three-phase three-dimensional iron cores in the same column face each other and are connected. The window of one column of three-phase three-dimensional iron cores located away from the other column of three-phase three-dimensional iron cores is the first window, and the window of one column of three-phase three-dimensional iron cores located closer to the other column of three-phase three-dimensional iron cores is the third window. The four conductive elements are a first conductive element, a second conductive element, a third conductive element, and a fourth conductive element arranged sequentially in the same direction.

[0014] In the first conductive element and the fourth conductive element, the first segment passes through the first window of one of the three-phase three-dimensional iron cores in the same column, the middle segment passes through the two second windows of the two three-phase three-dimensional iron cores in the same column, and the tail segment passes through the first window of the other three-phase three-dimensional iron core in the same column.

[0015] In the second conductive element and the third conductive element, the first segment passes through the third window of one of the two three-phase three-dimensional iron cores in the same column, the middle segment passes through the two second windows of the two three-phase three-dimensional iron cores in the same column, and the tail segment passes through the third window of the other three-phase three-dimensional iron core in the two three-phase three-dimensional iron cores in the same column.

[0016] In one embodiment, two intermediate sections are provided in each of the second windows of the two three-phase three-dimensional iron cores in the same column, and the current flow direction of the two intermediate sections in the same second window is consistent.

[0017] In one embodiment, the magnetic field applying device further includes a first auxiliary connector and a second auxiliary connector, wherein the first auxiliary connector is conductively connected between the tail section of the first conductive member and the head section of the fourth conductive member, and the second auxiliary connector is conductively connected between the tail section of the fourth conductive member and the head section of the second conductive member.

[0018] In one embodiment, the tail section of the second conductive element is in contact with and electrically connected to the head section of the third conductive element, and the tail section of the third conductive element and the head section of the second conductive element are arranged in layers and supported by an insulating member between them.

[0019] In one embodiment, the magnetic field applying device further includes a positive electrode and a negative electrode, the positive electrode being connected to the first segment of the first conductive element, and the negative electrode being connected to the tail segment of the third conductive element.

[0020] In one embodiment, the plurality of conductive elements have the same specifications; and / or the conductive elements are copper rods.

[0021] A three-phase three-dimensional iron core annealing device includes an annealing furnace and the aforementioned magnetic field application device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the application of the magnetic field application device in one embodiment of the present invention;

[0023] Figure 2 for Figure 1 The diagram shows the structure of the magnetic field application device.

[0024] Explanation of reference numerals in the attached drawings: 100, magnetic field application device; 10, conductive element; 12, intermediate section; 14, first section; 16, tail section; 17, bent opening; 32, first conductive element; 34, second conductive element; 36, third conductive element; 38, fourth conductive element; 50, first auxiliary connector; 70, second auxiliary connector; 82, positive electrode; 84, negative electrode; 200, three-phase three-dimensional iron core; 201, first window; 203, second window; 205, third window. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be 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 the present invention. However, the present invention can be practiced 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 the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] 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 invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly 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 is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply 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 that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0031] As described in the background section, it is impossible to obtain good magnetic domain orientation when performing magnetic field heat treatment on the iron core. The inventors discovered that the root cause of this problem is that for a three-phase three-dimensional iron core, there are three windows in three-dimensional space. If multiple magnetic fields are applied to a certain window, and the directions of the multiple magnetic fields are opposite, then these multiple magnetic fields will actually resist each other, making it impossible to obtain good magnetic domain orientation.

[0032] See Figures 1-2 In order to solve the above-mentioned technical problems, in one embodiment of the present invention, a magnetic field applying device 100 is provided, which is installed in the annealing furnace of the three-phase three-dimensional iron core 200 to apply a DC magnetic field, which can obtain better magnetic domain orientation and has high installation efficiency.

[0033] In one embodiment of the present invention, a magnetic field applying device 100 includes a plurality of conductive elements 10. The plurality of conductive elements 10 are electrically connected to each other to form a first magnetic field applying circuit and a second magnetic field applying circuit sleeved within the first magnetic field applying circuit. The first magnetic field applying circuit and the second magnetic field applying circuit are connected in series and the current flowing through the same iron core window of both circuits is in the same direction.

[0034] During the annealing process, if the volume of the three-phase three-dimensional iron core 200 is suitable, multiple three-phase three-dimensional iron cores 200 will be set up in the annealing furnace for simultaneous magnetic field heat treatment. Multiple conductive elements 10 are interconnected to apply a magnetic field, forming a first magnetic field application circuit and a second magnetic field application circuit that are nested together. In this way, multiple windows of the multiple three-phase three-dimensional iron cores 200 arranged in three-dimensional space can be filled with conductive elements 10 to apply a magnetic field. When the first magnetic field application circuit and the second magnetic field application circuit pass through a certain window at the same time, the flow direction of the first magnetic field application circuit and the second magnetic field application circuit in the same window is consistent, and the magnetic field direction is consistent, preventing the magnetic field directions from being opposite and canceling each other out, so that the three-phase three-dimensional iron core 200 can obtain better magnetic domain orientation.

[0035] Furthermore, the annealing furnace contains four three-phase solid iron cores 200 arranged in two rows and two columns, i.e., the four three-phase solid iron cores 200 are arranged in a square trajectory array. There are four conductive elements 10. Two of the four conductive elements 10 are connected end-to-end to form a second magnetic field application circuit, and the other two conductive elements 10 are positioned opposite each other on both sides of the second magnetic field application circuit and are electrically connected to each other to form a first magnetic field application circuit. The second magnetic field application circuit passes through a portion of the window in each three-phase solid iron core 200, and the first magnetic field application circuit passes through at least the remaining window in each three-phase solid iron core 200. Thus, by electrically connecting the four conductive elements 10, a magnetic field is applied to each window of the four three-phase solid iron cores 200, ensuring the effectiveness of the magnetic field heat treatment of each three-phase solid iron core 200.

[0036] Specifically, each conductive element 10 includes a middle section 12 and a first section 14 and a last section 16 located at opposite ends of the middle section 12. The first section 14 and the last section 16 are both bent toward the same side of the middle section 12, and a bending opening 17 is defined between them, meaning each conductive element 10 has a bending opening 17. Two of the four conductive elements 10 have two bending openings 17 facing each other, and these two conductive elements 10 are interconnected, merging the two bending openings 17 to form an annular cavity. That is, two conductive elements 10 are connected end-to-end to form a ring, which has an annular cavity, and a second magnetic field application circuit is formed on this ring. The other two conductive elements 10 have two bending openings 17 located on opposite sides of the annular cavity and arranged back-to-back. Thus, the other two conductive elements 10 bend and extend toward opposite sides to pass through windows at different positions in the three-phase three-dimensional core 200 from opposite directions, and these two conductive elements 10 are electrically connected to form a first magnetic field application circuit.

[0037] In some embodiments, each three-phase three-dimensional iron core 200 has a first window 201, a second window 203, and a third window 205. For four three-phase three-dimensional iron cores 200 arranged in two rows and two columns, the two second windows 203 of two three-phase three-dimensional iron cores 200 in the same column face each other and are connected. The window of one column of three-phase three-dimensional iron cores 200 located away from the other column of three-phase three-dimensional iron cores 200 is the first window 201, and the window of one column of three-phase three-phase iron cores 200 located closer to the other column of three-phase three-phase three-dimensional iron cores 200 is the third window 205. The four conductive elements 10 are a first conductive element 32, a second conductive element 34, a third conductive element 36, and a fourth conductive element 38 arranged sequentially in the same direction.

[0038] In the first conductive element 32 and the fourth conductive element 38, the first segment 14 passes through the first window 201 of one of the two three-phase three-dimensional iron cores 200 in the same column, the middle segment 12 passes through the two second windows 203 of the two three-phase three-dimensional iron cores 200 in the same column, and the tail segment 16 passes through the first window 201 of the other three-phase three-dimensional iron core 200 in the same column; in the second conductive element 34 and the third conductive element 36, the first segment 14 passes through the third window 205 of one of the two three-phase three-dimensional iron cores 200 in the same column, the middle segment 12 passes through the two second windows 203 of the two three-phase three-dimensional iron cores 200 in the same column, and the tail segment 16 passes through the third window 205 of the other three-phase three-dimensional iron core 200 in the same column.

[0039] That is, the second conductive element 34 and the third conductive element 36 are interconnected in a ring shape and pass through the second window 203 and the third window 205 of each three-phase three-dimensional iron core 200 to form a second magnetic field application circuit. The first conductive element 32 and the fourth conductive element 38 surround the outer ring and pass through the first window 201 and the second window 203 of each three-phase three-dimensional iron core 200 to form a second magnetic field application circuit.

[0040] Furthermore, each of the second windows 203 of the two three-phase three-dimensional iron cores 200 in the same row is provided with two intermediate sections 12. For example, in one row of three-phase three-dimensional iron cores 200, the intermediate sections 12 of the first conductive element 32 and the second conductive element 34 are provided in the two second windows 203, and in another row of three-phase three-dimensional iron cores 200, the intermediate sections 12 of the third conductive element 36 and the fourth conductive element 38 are provided in the two second windows 203. Moreover, the current flow direction of the two intermediate sections 12 in the same window is consistent, so that the two intermediate sections 12 apply magnetic fields with the same direction to the corresponding windows to obtain better magnetic domain orientation.

[0041] In some embodiments, the magnetic field applying device 100 further includes a first auxiliary connector 50 and a second auxiliary connector 70. The first auxiliary connector is conductively connected between the tail end of the first conductive member 32 and the head segment 14 of the fourth conductive member 38 to electrically connect the first conductive member 32 and the fourth conductive member 38. The second auxiliary connector 70 is conductively connected between the tail end of the fourth conductive member 38 and the head segment 14 of the second conductive member 34 to connect the first magnetic field applying circuit and the second magnetic field applying circuit in series.

[0042] Furthermore, the tail segment 16 of the second conductive member 34 is in contact with and electrically connected to the head segment 14 of the third conductive member 36. The tail segment 16 of the third conductive member 36 and the head segment 14 of the second conductive member 34 are separately disposed and supported by an insulating member between them. This insulatingly isolates the tail segment 16 of the third conductive member 36 from the head segment 14 of the second conductive member 34, so that after the second magnetic field application circuit is input from the head segment 14 of the second conductive member 34, it is output from the tail segment 16 of the third conductive member 36, thus preventing the input and output of the second magnetic field application circuit from being connected and short-circuited.

[0043] Specifically, the magnetic field applying device 100 further includes a positive electrode 82 and a negative electrode 84. The positive electrode 82 is connected to the first segment 14 of the first conductive element 32, and the negative electrode 84 is connected to the tail segment 16 of the third conductive element 36. When the positive electrode 82 and the negative electrode 84 are connected to the positive and negative terminals of the power supply, respectively, the current flows through the positive electrode 82, the first conductive element 32, the first auxiliary connector 50, the fourth conductive element 38, the second auxiliary connector 70, the second conductive element 34, the second conductive element 34, and the negative electrode 84. The positive electrode 82 and the negative electrode 84 are used to input current to the multiple conductive elements 10.

[0044] Optionally, both the positive electrode 82 and the negative electrode 84 are copper busbars. The conductive element 10 is connected to the positive electrode 82 by screws, and the conductive element 10 is also connected to the negative electrode 84 by screws.

[0045] In any of the above embodiments, the multiple conductive elements 10 have the same specifications. During the installation of the multiple conductive elements 10, since the multiple conductive elements 10 have the same specifications, any one of the conductive elements 10 can be used as one of the first conductive element 32, the second conductive element 34, the third conductive element 36, and the fourth conductive element 38. No selection is required during the installation process, thus improving installation efficiency.

[0046] Optionally, the conductive element 10 is a copper rod, which has good electrical conductivity. Specifically, when connecting the second conductive element 34 and the third conductive element 36, they are connected by fasteners, such as flattening the end of the copper rod and then connecting it with screws.

[0047] In one embodiment of the present invention, a three-phase three-dimensional iron core annealing device 200 is also provided, including an annealing furnace and a magnetic field application device 100 as described in any of the above embodiments.

[0048] The magnetic field applying device 100 includes a plurality of conductive elements 10. The plurality of conductive elements 10 are electrically connected to each other to form a first magnetic field applying circuit and a second magnetic field applying circuit sleeved within the first magnetic field applying circuit. The first magnetic field applying circuit and the second magnetic field applying circuit are connected in series and the current flowing through the same iron core window of both circuits is in the same direction.

[0049] During the annealing process, if the volume of the three-phase three-dimensional iron core 200 is suitable, multiple three-phase three-dimensional iron cores 200 will be set up in the annealing furnace for simultaneous magnetic field heat treatment. Multiple conductive elements 10 are interconnected to apply a magnetic field, forming a first magnetic field application circuit and a second magnetic field application circuit that are nested together. In this way, multiple windows of the multiple three-phase three-dimensional iron cores 200 arranged in three-dimensional space can be filled with conductive elements 10 to apply a magnetic field. When the first magnetic field application circuit and the second magnetic field application circuit pass through a certain window at the same time, the flow direction of the first magnetic field application circuit and the second magnetic field application circuit in the same window is consistent, and the magnetic field direction is consistent, preventing the magnetic field directions from being opposite and canceling each other out, so that the three-phase three-dimensional iron core 200 can obtain better magnetic domain orientation.

[0050] Furthermore, all conductive components 10 have the same specifications. During installation, since all conductive components 10 have the same specifications, there is no need to select them, thereby improving installation efficiency.

[0051] 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.

[0052] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A magnetic field applying device, characterized in that, A DC magnetic field is applied in an annealing furnace containing a three-phase three-dimensional iron core. The magnetic field application device includes: Multiple conductive components are electrically connected to each other to form a first magnetic field applying circuit and a second magnetic field applying circuit sleeved within the first magnetic field applying circuit. The first magnetic field application circuit and the second magnetic field application circuit are connected in series and the current flowing through the same iron core window is in the same direction; the annealing furnace is equipped with four three-phase three-dimensional iron cores arranged in two rows and two columns. The conductive element comprises four components. Two of the four conductive elements are connected end to end to form the second magnetic field application circuit. The other two of the four conductive elements are disposed opposite each other on both sides of the second magnetic field application circuit and are electrically connected to each other to form the first magnetic field application circuit. The second magnetic field application circuit passes through a portion of the window in each of the three-phase three-dimensional iron cores, and the first magnetic field application circuit passes through at least the remaining window in each of the three-phase three-dimensional iron cores. Each of the conductive elements includes a middle section and a first section and a tail section located at opposite ends of the middle section. The first section and the tail section are both bent toward the same side of the middle section and a bend opening is defined between them. Two of the four conductive elements have two bend openings facing each other, and the two conductive elements are connected to each other and the two bend openings are merged to form an annular cavity. The two bend openings of the other two conductive elements are located on opposite sides of the annular cavity and are arranged back to back. Each of the three-phase three-dimensional iron cores has a first window, a second window and a third window. The two second windows of two three-phase three-dimensional iron cores in the same column face each other and are connected. The window of one column of three-phase three-dimensional iron cores located away from the other column of three-phase three-dimensional iron cores is the first window, and the window of one column of three-phase three-dimensional iron cores located closer to the other column of three-phase three-dimensional iron cores is the third window. Two intermediate sections are provided in each of the second windows of the two three-phase three-dimensional iron cores in the same column, and the current flow direction of the two intermediate sections in the same second window is consistent.

2. The magnetic field applying device according to claim 1, characterized in that, The four conductive elements are a first conductive element, a second conductive element, a third conductive element, and a fourth conductive element arranged sequentially in the same direction; among the first conductive element and the fourth conductive element, the first segment passes through the first window of one of the three-phase three-dimensional iron cores in the same column, the middle segment passes through the two second windows of the two three-phase three-dimensional iron cores in the same column, and the tail segment passes through the first window of the other three-phase three-dimensional iron core in the same column. In the second conductive element and the third conductive element, the first segment passes through the third window of one of the two three-phase three-dimensional iron cores in the same column, the middle segment passes through the two second windows of the two three-phase three-dimensional iron cores in the same column, and the tail segment passes through the third window of the other three-phase three-dimensional iron core in the two three-phase three-dimensional iron cores in the same column.

3. The magnetic field applying device according to claim 2, characterized in that, The magnetic field applying device further includes a first auxiliary connector and a second auxiliary connector. The first auxiliary connector is conductively connected between the tail section of the first conductive element and the head section of the fourth conductive element, and the second auxiliary connector is conductively connected between the tail section of the fourth conductive element and the head section of the second conductive element.

4. The magnetic field applying device according to claim 3, characterized in that, The tail section of the second conductive element is in contact with and electrically connected to the head section of the third conductive element. The tail section of the third conductive element and the head section of the second conductive element are arranged in layers and supported by an insulating element between them.

5. The magnetic field applying device according to claim 4, characterized in that, The magnetic field applying device further includes a positive electrode and a negative electrode. The positive electrode is connected to the first segment of the first conductive element, and the negative electrode is connected to the tail segment of the third conductive element.

6. The magnetic field applying device according to any one of claims 1-5, characterized in that, Multiple conductive elements have the same specifications; and / or the conductive elements are copper rods.

7. A three-phase three-dimensional iron core annealing device, characterized in that, It includes an annealing furnace and a magnetic field applying device as described in any one of claims 1-6.

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