A multi-pole magnetizing fixture structure for multi-layer windings

Abstract

The present invention relates to the technical field of magnetizing fixtures, and discloses a multi-pole magnetizing fixture structure with multi-layer windings, comprising a fixture body, a magnetic rod, and a conductor layer. The fixture body is provided with a plurality of conductor grooves penetrating the fixture body, and the plurality of conductor grooves are evenly arranged around the axis of the fixture body; the magnetic rod is located within the fixture body, and a placement area for the target product magnetic ring is formed between the magnetic rod and the inner wall of the fixture body; the conductor layer is formed by bending a conductor multiple times and passing through each of the conductor grooves in sequence, and the number of conductor layers is two or four. This application forms an even-numbered coil winding by providing a plurality of conductor grooves on the inner wall of a cylindrical fixture body and adopting a specific winding method. The magnetic fields generated by different conductor layers are superimposed and enhanced at the magnet, which can avoid loss, give full play to the effect of the magnetic field, and achieve a higher magnetic flux density than a traditional coil structure with the same voltage excitation.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetizing clamps, and in particular to a multi-pole magnetizing clamp structure for multi-layer windings. Background Art

[0002] Bonded NdFeB permanent magnets are increasingly popular in the fields of information technology, new energy, and precision manufacturing due to their exceptionally high dimensional accuracy, wide range of shape freedom, and excellent magnetic properties. Before use, permanent magnets must be magnetized to develop their magnetic properties. Currently, a pulse current, momentarily discharged from a capacitor, is applied to the magnetizing fixture's wires to generate a magnetic field that magnetizes the magnet. Traditional multi-pole magnetizing fixtures typically cut several conductor slots around the core near the magnet. A single wire is then strung through the slots using a specific winding method, forming several nearly closed series coils. By connecting the two ends of the fixture's wires to the magnetizing device circuit and applying current, several adjacent, circular magnetic fields with opposite directions are generated around the magnet. However, the magnetic field required to saturate the permanent magnet is extremely large, which means the initial capacitor voltage and peak pulse current are extremely high, placing high demands on the equipment and resulting in limited long-term use of the magnetizing device. Summary of the Invention

[0003] The technical problem solved by the present invention is that the magnetic field required for saturation magnetization of permanent magnets is very large, which means that the required initial capacitor voltage and pulse current peak are very high, and the requirements for equipment are very high, resulting in the inability to use the magnetization equipment for a long time.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A multi-pole magnetizing fixture structure for multi-layer windings, comprising:

[0006] A fixture body, wherein the fixture body is cylindrical in structure and has a plurality of wire grooves therein that penetrate the fixture body, wherein the wire grooves are aligned with the axis of the fixture body and are evenly arranged around the axis of the fixture body;

[0007] A magnetic conductive rod, the magnetic conductive rod is located in the fixture body, and a placement area for placing the target product magnetic ring is formed between the magnetic conductive rod and the inner wall of the fixture body;

[0008] The conductor layer is formed by bending a conductor multiple times and passing through each of the conductor slots in sequence. The number of the conductor layers is two or four, and both ends of the conductor are connected to a power source.

[0009] In one embodiment of the present invention, a cooling cavity is provided in the fixture body, and the cooling cavity is arranged along the axis direction of the fixture body.

[0010] In one embodiment of the present invention, the cross section of the cooling cavity is arc-shaped.

[0011] In one embodiment of the present invention, the two cooling chambers are symmetrically arranged, and the interval between the two cooling chambers corresponds to the interval between two adjacent wire grooves.

[0012] In one embodiment of the present invention, the clamp body is a solid body or a laminated structure of silicon steel or pure iron.

[0013] In one embodiment of the present invention, the wire trough is a multi-layer circular hole or an elongated rectangular hole in cross section.

[0014] In one embodiment of the present invention, the wire groove is connected to the space inside the clamp body.

[0015] In one embodiment of the present invention, the distance between the wire groove and the inner wall of the clamp body is less than 1 mm.

[0016] In one embodiment of the present invention, the number of the wire ducts is 4 to 60.

[0017] In one embodiment of the present invention, after the conductor layer is wound, the gas in the conductor duct is exhausted and epoxy resin is poured into the conductor duct.

[0018] Beneficial effects of the present invention:

[0019] This application opens multiple wire grooves on the inner wall of the cylindrical fixture body and adopts a specific winding method to form an even-layer coil winding. The magnetic fields generated by different wire layers are superimposed and enhanced at the magnet, which can avoid losses and give full play to the role of the magnetic field. It can be excited with the same voltage to achieve a higher magnetic flux density than the traditional coil structure.

[0020] A cooling chamber connected to a water-cooling pipe allows coolant to flow through, ensuring rapid cooling of the fixture body. Providing two discontinuous annular chambers allows for coverage of the largest possible area of ​​the fixture body, fully ensuring heat dissipation. The two cooling chambers are symmetrically positioned, with the spacing between them corresponding to the spacing between adjacent wire ducts. Heat generation is primarily due to the wires, and since coolant flows into the cooling chambers, the cooling effect is guaranteed. Therefore, aligning the spacing between the cooling chambers with the spacing between adjacent wire ducts ensures a fully integrated cooling effect.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0023] Figure 1 It is a structural schematic diagram of a four-layer coil winding model of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a two-layer coil winding model of the present invention;

[0025] Figure 3 Schematic diagram of the structure of a 1-layer coil winding model used as a comparative example;

[0026] Figure 4 The following are the current simulation diagrams of the magnetizing fixture with 1, 2, and 4-layer winding structures respectively;

[0027] Figure 5 The following are simulation diagrams of the magnetic flux density distribution on the outer circumference of the magnet for magnetizing fixtures with 1, 2, and 4-layer winding structures respectively;

[0028] Figure 6 yes Figure 5 Magnified view of the shaded area.

[0029] The reference numerals in the figures are:

[0030] 1. Fixture body; 2. Placement area; 3. Magnetic rod; 4. Wire duct; 5. Cooling chamber; 6. Sealing cover; 7. Connecting port. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0033] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0034] See also Figure 1-6 The present invention provides a multi-pole magnetizing fixture structure for multi-layer windings, comprising a fixture body 1 (i.e., the iron core of the magnetizing fixture) and a magnetic rod 3. The fixture body 1 is cylindrical and can be solid or laminated, made of a material with good magnetic conductivity, such as silicon steel or pure iron. Multiple wire grooves 4 are defined within the fixture body 1, extending through the fixture body 1. The wire grooves 4 are aligned with the axis of the fixture body 1 and are evenly distributed around the axis of the fixture body 1. In cross-section, the wire grooves 4 are multi-layer circular holes or elongated rectangular holes. The diameter of the circular holes or the width of the rectangular holes match the size of the wires to be placed therein. The multi-layer circular holes are formed by forming multiple layers of circular holes along the radial direction of the fixture body 1. Alternatively, a rectangular hole is defined along the radial direction, with a length corresponding to the sum of the diameters of the corresponding number of layers of wires. The wire grooves 4 may or may not be connected to the space within the fixture body 1. However, regardless of whether they are connected or not, the distance between the wire groove 4 and the inner wall of the clamp body 1 is less than 1 mm. The number of the wire grooves 4 can be 4 to 60, with 6 being used as an example in the drawings.

[0035] See also Figure 1-3 In one embodiment of the present invention, a magnetic rod 3 is placed at the center of the magnetic ring during use. The magnetic rod 3 can be made of a material with high magnetic permeability, such as industrial pure iron or silicon steel, effectively guiding magnetic lines of force radially through the magnet. The magnetic rod 3 is located within the fixture body 1 and can be coaxial with the fixture body 1. A placement area 2 for the target product's magnetic ring is formed between the magnetic rod 3 and the inner wall of the fixture body 1. After placement of the target magnetic ring, both ends of the fixture body 1 must be at least 5 mm higher (longer) than the centrally placed magnet. The conductor layer is formed by bending a single conductor (made of pure copper) multiple times (in an S-shape) through each of the conductor slots 4. This means that the conductor enters one end of a conductor slot 4 and exits the other end. The conductor then enters the other end of the adjacent conductor slot 4 and exits the other end of the adjacent conductor slot 4, and so on, until the innermost conductor layer is formed. A second conductor layer is then formed outward, until the desired number of conductor layers is reached. Both ends of the conductor are connected to a power source for power supply. The number of wire layers must be even, ensuring that all closed coils have the same number of layers to avoid mutual consumption when forming magnetic fields. The number of wire layers is preferably two or four. If there are more layers, the magnetic field generated by the outer coils may affect the magnetic field generated by the inner coils, resulting in losses and thus having the opposite effect.

[0036] See also Figure 1-3In one embodiment of the present invention, after the wire layer is wound, the air in the wire duct 4 is exhausted and epoxy resin is poured into the wire duct 4. This epoxy resin pouring process is performed in a vacuum furnace. First, the wire duct 4 of the fixture body 1 is evacuated in the vacuum furnace to exhaust the air in the holes. Then, the resin is poured into the wire duct 4 to ensure that the resin fills the entire wire duct 4. The resin filling method can fix the wire, ensure the stability of the coil, and improve the heat conduction efficiency and heat dissipation efficiency of the coil.

[0037] See also Figure 1-3 In one embodiment of the present invention, a cooling cavity 5 is provided within the fixture body 1 and is arranged along the axis of the fixture body 1. The cross-section of the cooling cavity 5 is arc-shaped. That is, two discontinuous annular cavities are cut out of the outer circumference of the core and penetrate the core body to serve as cooling grooves. The openings of the cooling grooves at the cross-sections of the core at both ends need to be connected to the sealing cover 6 by bonding. The sealing cover 6 has a connecting port for connecting to the water cooling pipe. The cooling cavity 5 connected to the water cooling pipe allows the flow of coolant to ensure rapid cooling of the fixture body 1. The provision of two discontinuous annular cavities can cover as large an area of ​​the fixture body 1 as possible, fully ensuring the heat dissipation effect. Furthermore, the two cooling cavities 5 are symmetrically arranged, and the spacing between the two cooling cavities 5 corresponds to the spacing between two adjacent wire grooves 4. The heat generation is mainly caused by the wires, and the cooling cavity 5 ensures the cooling effect because of the flow of coolant. Therefore, arranging the spacing of the cooling cavity 5 in the same position as the spacing between adjacent wire grooves 4 can fully ensure the overall cooling effect.

[0038] See also Figure 1-3 In one embodiment of the present invention, the radial 6-pole outer circumferential magnetization of an isotropic bonded NdFeB magnetic ring with a size of φ30×φ28×5mm is taken as an example for specific description. Figures 1 to 3 The magnetized fixture cores have 4, 2, and 1 layers of windings in the radial direction, respectively. Figure 3 The effect of the model is equivalent to the existing single-layer winding structure and is used as a comparative example. A magnetic rod 3 is placed in the center of the iron core, with a magnetic ring placement area 2 between the two. Inside the magnetic ring is a magnetic rod 3 made of pure iron. Multiple wire grooves 4 are distributed around the inner circumference of the iron core. After a layer of enameled pure copper wire with a diameter of φ2mm is wound around the inner circumference in an S-shape multiple times, the next layer is wound until the required number of layers is reached. In order to prevent the wire from generating excessive heat, which would cause the epoxy resin fixing layer to expand and damage the fixture, a dual cooling cavity 5 cooling structure for direct cooling of the iron core is designed to speed up the cooling efficiency. At the same time, in order to prevent welding from affecting the magnetic conductivity of the iron core, the sealing cover 6 is connected to the iron core by bonding. The sealing cover 6 has a connecting port 7 connected to the water cooling pipe.

[0039] See also Figure 2 In one embodiment of the present invention, the winding method is as follows Figure 2 For example, the wire is inserted along position p1, exited from position p2, and then inserted along position p3, and repeated in sequence. When it exits from position p6, it is directly inserted from position p7, and the cycle is repeated; eventually, a complete double-layer winding coil is formed, which is introduced at position p1 and exits at position p12.

[0040] See also Figure 4-6 , using the simulation software COMSOL6.2, respectively, the above ( Figures 1 to 3 The electromagnetic simulation is performed on the fixture model (shown as 4, 2, and 1 layer windings, respectively), using the same material model parameters and 1000V voltage excitation. Figure 4 It can be seen that as the number of wire winding layers increases, the peak value of the pulse current not only does not increase, but actually decreases. However, due to the use of a specific winding method to form an even number of wire layers, the magnetic field is superimposed at the magnet position, and the magnetic flux density generated at the magnet position is even higher than that of the fixture with a single-layer coil distribution. The traditional single-layer is only 1.49T, while the peak magnetic flux density of the fixture with a four-layer winding structure can reach 1.77T (such as Figure 5 、 6 ). Therefore, the present application adopts a specific winding method to form an even-numbered layer (2 or 4 layers) winding, which can achieve a higher magnetic field strength without increasing the peak value of the pulse current, thereby reducing the requirement for the initial voltage of the capacitor and ensuring the service life of the magnetizing equipment.

[0041] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A multi-pole magnetizing fixture structure for multi-layer windings, characterized in that: include: A clamp body (1), wherein the clamp body (1) is a cylindrical structure, and a plurality of wire grooves (4) are provided therein and pass through the clamp body (1), wherein the wire grooves (4) are aligned with the axis of the clamp body (1), and the plurality of wire grooves (4) are evenly arranged around the axis of the clamp body (1); A magnetic rod (3), the magnetic rod (3) being located in the fixture body (1), and a placement area (2) for placing a magnetic ring of a target product is formed between the magnetic rod (3) and the inner wall of the fixture body (1); The conductor layer is formed by bending a conductor multiple times and passing through each of the conductor slots (4) in sequence, and the number of the conductor layers is two or four, and both ends of the conductor are connected to a power source.

2. A multi-pole magnetizing fixture structure for multi-layer windings according to claim 1, characterized in that: A cooling cavity (5) is provided in the clamp body (1), and the cooling cavity (5) is arranged along the axial direction of the clamp body (1).

3. A multi-pole magnetizing fixture structure for multi-layer windings according to claim 2, characterized in that: The cross section of the cooling cavity (5) is arc-shaped.

4. A multi-pole magnetizing fixture structure for multi-layer windings according to claim 3, characterized in that: The two cooling cavities (5) are symmetrically arranged, and the interval between the two cooling cavities (5) corresponds to the interval between two adjacent wire grooves (4).

5. The multi-pole magnetizing fixture structure for multi-layer windings according to claim 1, characterized in that: The clamp body (1) is a solid body or a laminated structure of silicon steel or pure iron.

6. A multi-pole magnetizing fixture structure for multi-layer windings according to claim 5, characterized in that: In cross section, the wire duct (4) is a multi-layer circular hole or an elongated rectangular hole.

7. A multi-pole magnetizing fixture structure for multi-layer windings according to claim 6, characterized in that: The wire groove (4) is connected to the space inside the clamp body (1).

8. A multi-pole magnetizing fixture structure for multi-layer windings according to claim 7, characterized in that: The distance between the wire groove (4) and the inner wall of the clamp body (1) is less than 1 mm.

9. A multi-pole magnetizing fixture structure for multi-layer windings according to claim 8, characterized in that: The number of the wire ducts (4) is 4 to 60.

10. A multi-pole magnetizing fixture structure for multi-layer windings according to claim 9, characterized in that: After the conductor layer is wound, the gas in the conductor trough (4) is exhausted and epoxy resin is poured into the conductor trough (4).

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