An orientation device and orientation molding method for injection-molded magnets

Abstract

The application relates to the technical field of a magnet orientation device, and particularly discloses an orientation device and an orientation forming method for an injection-molded magnet, the orientation device comprising a permanent magnet, a magnetic-conducting outer sleeve abutting against the outer periphery of the permanent magnet, and a non-magnetic-conducting inner sleeve abutting against the inner wall of the permanent magnet, wherein a circular mold cavity is arranged in the middle of the non-magnetic-conducting inner sleeve; the permanent magnet comprises first magnetic blocks and second magnetic blocks as repeating units and is arranged in a ring structure in a head-to-tail manner according to a Halbach array arrangement mode. The size of the first magnetic blocks and the second magnetic blocks and the distance rule from the inner profile surface to the mold cavity wall are adjusted, the shortest distance relationship from the inner profile surface of the two kinds of magnetic blocks to the center of the mold and the curvature relationship of the two kinds of inner profile surfaces are limited, so that when the orientation device is used for injection molding of a magnet with relatively wide magnetic poles, the waveform of the orientation device is a sinusoidal wave, the waveform is smoother, the motor runs stably, and the noise and vibration are small.

Description

Technical Field

[0001] This invention relates to the technical field of magnet alignment devices, and specifically to an alignment device and alignment molding method for injection-molded magnets. Background Technology

[0002] Magnet injection molding is an industrial method for producing permanent magnets. The core of this method involves mixing magnetic powder with plastic or other binders, and then producing magnets of the desired shape through injection molding. When producing small, high-precision magnetic components such as electromagnets, sensors, and speaker magnetic rings, magnet injection molding offers advantages such as the ability to achieve complex geometric designs and high cost-effectiveness. Therefore, it is widely used in various fields including electronic equipment, motors, machinery manufacturing, medical equipment, and the automotive industry.

[0003] Orientation in magnet injection molding technology refers to aligning magnetic domains in a specific direction within the binder to fully release the material's magnetic properties. Orientation methods mainly include permanent magnet orientation and electromagnetic orientation. Permanent magnet orientation typically utilizes Halbach arrays. Halbach arrays arrange magnets according to a specific pattern, enhancing the magnetic field on one side of the array while significantly weakening or even canceling it out on the other. This arrangement usually involves alternating the north and south poles of the magnets, concentrating the magnetic field on one side of the array.

[0004] Currently, the traditional single-sided magnetic field-enhanced multi-pole ring Halbach array structure divides the ring magnet into multiple geometrically consistent sector-shaped magnetic blocks. These magnetic blocks are arranged and combined with different magnetization directions to form a specific magnetic field distribution, which is then assembled in subsequent steps. However, for injection-molded magnets with wide poles, the traditional Halbach permanent magnet array alignment device has some limitations in application. Injection-molded magnets produced using this device often exhibit a square wave or saddle wave waveform. The unevenness of this waveform can cause torque fluctuations in motors made from these magnets during operation, thus affecting the smooth operation of the motor and generating significant noise. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem of low smoothness of magnetic field waveform in injection-molded magnets produced by traditional alignment devices containing Halbach array structures in the prior art. This invention provides an alignment device and alignment molding method for injection-molded magnets. The structure of the permanent magnet has been specifically designed and adjusted. The smallest cycle unit of the permanent magnet is designed with different volumes and different distances from the inner surface to the mold cavity. This makes the alignment device have a smoother air gap magnetic field. When injection molding magnets with wider magnetic poles, the waveform is a quasi-sine wave. The waveform is smoother, the motor runs smoothly, and there is less noise and vibration.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] An orientation device for injection-molded magnets, comprising:

[0008] A permanent magnet, the permanent magnet comprising a ring structure formed by connecting end to end of a first magnetic block and a second magnetic block as repeating units in a Halbach arrangement;

[0009] A magnetically conductive outer sleeve is wrapped around the outside of the permanent magnet;

[0010] A non-magnetic inner sleeve, wherein the non-magnetic inner sleeve abuts against the annular inner wall of the permanent magnet;

[0011] The non-magnetic inner sleeve has a circular mold cavity in the middle, which is used to hold the injection-molded magnet melt.

[0012] The volume of the first magnetic block is not equal to the volume of the second magnetic block;

[0013] The shortest distance from the first inner surface of the first magnetic block to the mold cavity wall is less than the shortest distance from the second inner surface of the second magnetic block to the mold cavity wall;

[0014] The shortest distance r from the first inner surface of the first magnetic block to the center of the mold and the shortest distance R from the second inner surface of the second magnetic block to the center of the mold have the following relationship: R / r≥1;

[0015] The curvature K1 of the first inner surface of the first magnet and the curvature K2 of the second inner surface of the second magnet have the following relationship: K1 / K2<0.2.

[0016] The orientation device for injection-molded magnets provided in this application includes a permanent magnet, a magnetically conductive outer sleeve abutting the periphery of the permanent magnet, and a non-magnetically conductive inner sleeve abutting the inner wall of the permanent magnet. A circular mold cavity is provided in the center of the non-magnetically conductive inner sleeve. Simultaneously, the structure of the permanent magnet has been specifically designed and adjusted. The permanent magnet comprises a ring structure formed by connecting end-to-end first and second magnetic blocks in a Halbach arrangement, with the volumes of the first and second magnetic blocks being unequal. The shortest distance from the inner surface of the first magnetic block to the mold cavity wall is less than the shortest distance from the inner surface of the second magnetic block to the mold cavity wall. By adjusting the sizes of the first and second magnetic blocks and the distance rules from their inner surfaces to the mold cavity wall, the shortest distance relationship from the inner surfaces of the two types of magnetic blocks to the center of the mold and the curvature relationship of the two inner surfaces are defined. This results in a quasi-sine wave waveform when the orientation device injection-moldes magnets with wide magnetic poles; the waveform is smoother, the motor runs smoothly, and noise and vibration are low.

[0017] Furthermore, the shortest distance r from the first inner surface of the first magnetic block to the center of the mold and the shortest distance R from the second inner surface of the second magnetic block to the center of the mold have the following relationship: 1.05≤R / r≤1.4.

[0018] Furthermore, the outer diameter od of the circular mold cavity and the number of pole pairs 2*p of the orientation device have the following relationship: od*π / (2*p)>5 mm.

[0019] Furthermore, the first inner surface of the first magnetic block is a straight surface or an arc surface, the second inner surface of the second magnetic block is a straight surface or an arc surface, and the point with the shortest distance from the center of the mold among the contact points of the first magnetic block and the second magnetic block is located on the inner surface.

[0020] Furthermore, the first magnetic block and the second magnetic block are sector-shaped magnetic blocks, and the central angle of the first magnetic block is 20° to 60°.

[0021] Furthermore, the permanent magnets are arranged in a clockwise cycle with magnetization at 0°, 90°, 180° and 270°.

[0022] The first magnetic block is magnetized at 0° or 180°, and the second magnetic block is magnetized at 90° or 270°.

[0023] Furthermore, the orientation device has 2 to 4 pole pairs.

[0024] Furthermore, the magnetically conductive outer jacket is made of a material with an initial relative permeability >50 and a saturation magnetization >1T.

[0025] The non-magnetic inner sleeve is made of a material with an initial relative permeability of <10.

[0026] Another object of the present invention is to protect the method of orientation forming using the above-described orientation device.

[0027] A method for orientation molding using an orientation device for injection-molded magnets as described above includes the following steps:

[0028] Step 1: Assemble the above-mentioned orientation device for injection-molded magnets, and install the assembled orientation device into the injection mold frame to form an injection mold.

[0029] Step 2: Install the injection mold in the injection molding equipment;

[0030] Step 3: The injection molten material is injected into the injection mold using an injection molding machine. During the molding process, the injection molten magnetic material is oriented under the action of the magnetic field in the orientation device to obtain the injection-molded magnet.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] The orientation device for injection-molded magnets provided in this application includes a permanent magnet, a magnetically conductive outer sleeve abutting the periphery of the permanent magnet, and a non-magnetically conductive inner sleeve abutting the inner wall of the permanent magnet. A circular mold cavity is provided in the center of the non-magnetically conductive inner sleeve. Simultaneously, the structure of the permanent magnet has been specifically designed and adjusted. The permanent magnet comprises a ring structure formed by connecting end-to-end first and second magnetic blocks in a Halbach arrangement, with the volumes of the first and second magnetic blocks being unequal. The shortest distance from the inner surface of the first magnetic block to the mold cavity wall is less than the shortest distance from the inner surface of the second magnetic block to the mold cavity wall. By adjusting the sizes of the first and second magnetic blocks and the distance rules from their inner surfaces to the mold cavity wall, the shortest distance relationship from the inner surfaces of the two types of magnetic blocks to the center of the mold and the curvature relationship of the two inner surfaces are defined. This results in a quasi-sine wave waveform when the orientation device injection-moldes magnets with wide magnetic poles; the waveform is smoother, the motor runs smoothly, and noise and vibration are low. Attached image description:

[0033] Figure 1 This is a schematic diagram of the orientation device of the present invention with 2 pole pairs.

[0034] Figure 2 This is a schematic diagram of the orientation device of the present invention with 3 pole pairs.

[0035] Figure 3 This is a schematic diagram of the orientation device of the present invention with 4 pole pairs.

[0036] Figure 4 This is a schematic diagram of the magnetization direction of a magnetic block in a permanent magnet.

[0037] Figure 5 The diagram shows the air gap magnetic field waveform of the orientation device in the embodiment.

[0038] In the diagram, the markings are: 1-permanent magnet, 11-first magnetic block, 12-second magnetic block, 2-magnetic outer sleeve, 3-non-magnetic inner sleeve, 4-circular mold cavity, 41-mold cavity wall, 5-first inner surface, 6-second inner surface. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0040] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution. They do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship, and therefore should not be construed as limiting the present invention.

[0041] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0042] Furthermore, the use of terms such as "first," "second," "third," etc. in terminology is merely for distinguishing identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0043] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0044] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0045] Traditional single-sided magnetic field-enhanced multi-pole ring Halbach array structures divide a ring magnet into multiple geometrically consistent sector-shaped magnetic blocks. These blocks are arranged and combined with different magnetization directions to form a specific magnetic field distribution, which is then assembled in subsequent steps. However, for injection-molded magnets with wide poles, traditional Halbach permanent magnet array alignment devices have some limitations in application. Injection-molded magnets produced using this device often exhibit square wave or saddle wave waveforms. The unevenness of these waveforms can cause torque fluctuations in motors made from these magnets during operation, thus affecting the smooth operation of the motor and generating significant noise.

[0046] Therefore, such as Figures 1-4 As shown, an orientation device for injection-molded magnets includes: a permanent magnet 1, wherein the permanent magnet 1 comprises a ring structure formed by connecting end to end of a first magnetic block 11 and a second magnetic block 12 as repeating units in a Halbach arrangement.

[0047] A magnetically conductive outer sleeve 2 is wound around the outside of the permanent magnet 1;

[0048] A non-magnetic inner sleeve 3 abuts against the annular inner wall of the permanent magnet 1;

[0049] The non-magnetic inner sleeve 3 has a circular mold cavity 4 in the middle, which is used to hold the injection-molded magnet melt.

[0050] The volume of the first magnetic block 11 is not equal to the volume of the second magnetic block 12;

[0051] The shortest distance from the first inner surface 5 of the first magnetic block 11 to the mold cavity wall 41 is less than the shortest distance from the second inner surface 6 of the second magnetic block 12 to the mold cavity wall 41;

[0052] The shortest distance r from the first inner surface 5 of the first magnetic block 11 to the center of the mold and the shortest distance R from the second inner surface 6 of the second magnetic block 12 to the center of the mold have the following relationship: R / r≥1;

[0053] The curvature K1 of the first inner surface 5 of the first magnetic block 11 and the curvature K2 of the second inner surface 6 of the second magnetic block 12 have the following relationship: K1 / K2<0.2.

[0054] The orientation device for injection-molded magnets provided in this application, by adjusting the size of the first and second magnetic blocks and the distance rules from the inner surface to the mold cavity wall, limits the shortest distance relationship between the inner surfaces of the two magnetic blocks and the center of the mold, as well as the curvature relationship between the two inner surfaces, so that when the orientation device is used to injection-mold a magnet with a wide magnetic pole, its waveform is quasi-sine wave; the waveform is smoother, the motor runs smoothly, and the noise and vibration are small.

[0055] Furthermore, the shortest distance r from the first inner surface 5 of the first magnetic block 11 to the center of the mold and the shortest distance R from the second inner surface 6 of the second magnetic block 12 to the center of the mold have the following relationship: 1.05≤R / r≤1.4.

[0056] In some embodiments, the outer diameter od of the circular mold cavity 4 and the number of pole pairs 2*p of the orientation device have the following relationship: od*π / (2*p)>5 mm. The larger the arc length corresponding to each magnetic pole pair on the outer diameter of the mold in the orientation device, that is, the larger the space between the magnetic poles, the more uneven the magnetic field distribution inside the magnet will be, forming a region with low magnetic field strength between the magnetic poles. However, the orientation device provided in this application produces a quasi-sine wave waveform when injection molding a magnet with wide magnetic poles; the waveform is smoother, the motor runs smoothly, and the noise and vibration are small.

[0057] In some embodiments, the first inner surface 5 of the first magnetic block 11 is a straight surface or an arc surface, and the second inner surface 6 of the second magnetic block 12 is a straight surface or an arc surface. Among the contact points of the first and second magnetic blocks, the point with the shortest distance from the center of the mold is located on the inner surface. Preferably, when the second inner surface 6 of the second magnetic block 12 is a curved surface, the orientation effect of the orientation device is better. When the inner surface is a straight surface, the curvature K1 is infinitely small. The second inner surface 6 of the second magnetic block is an arc surface with a radius of R and a curvature of K2. The difference between K1 and K2 is large, and the orientation effect of the orientation device is more prominent. The shortest distance r from the centerline of the arc surface of the first magnetic block to the center of the mold and the shortest distance R from the inner surface of the second magnetic block to the center of the mold have the following relationship: R / r≥1, preferably 1.05≤R / r≤1.4. The curvature K1 of the inner surface of the first magnetic block and the curvature K2 of the inner surface of the second magnetic block have the following relationship: K1 / K2<0.2.

[0058] In some embodiments, the first magnetic block 11 and the second magnetic block 12 are sector-shaped magnetic blocks, and the central angle of the first magnetic block 11 is 20° to 60°. Within this angle range, the surface magnetic peak value of the orientation device can be maintained at a high level, while the waveform is relatively smooth.

[0059] In some embodiments, the permanent magnets 1 are arranged in a clockwise cycle of 0° magnetization, 90° magnetization, 180° magnetization, and 270° magnetization; the first magnetic block 11 is magnetized at 0° or 180°, and the second magnetic block 12 is magnetized at 90° or 270°.

[0060] In some embodiments, the number of pole pairs in the alignment device is 2 to 4. The number of pole pairs in the alignment device refers to the number of magnetic pole pairs in the magnetic field device used to align the magnets during injection molding. The number of pole pairs determines the spatial distribution of the magnetic field generated by the alignment device. This invention can improve the magnetic circuit for the arrangement and geometry of the annular Halbach magnets in alignment devices with a small number of pole pairs, making it have a smoother air gap magnetic field, thus solving the problem that conventional alignment devices in the prior art are difficult to solve with a small number of pole pairs.

[0061] Furthermore, the magnetic outer sleeve 2 is made of a material with an initial relative permeability >50 and a saturation magnetization >1T, while the non-magnetic inner sleeve 3 is made of a material with an initial relative permeability <10.

[0062] The method for orientation molding using the orientation device for injection-molded magnets as described above includes the following steps:

[0063] Step 1: Assemble the orientation device of the injection-molded magnet, and install the assembled orientation device into the injection mold frame to form an injection mold;

[0064] Step 2: Install the injection mold in the injection molding equipment;

[0065] Step 3: The injection molten material is injected into the injection mold using an injection molding machine. During the molding process, the injection molten magnetic material is oriented under the action of the magnetic field in the orientation device to obtain the injection-molded magnet.

[0066] Therefore, orientation devices of Example 1 and Comparative Example 1 are provided, and the air gap magnetic field waveforms of the orientation devices are tested, such as... Figure 5 As shown.

[0067] The specific structure is as follows:

[0068] Example 1

[0069] like Figure 1 As shown, Embodiment 1 provides an orientation device with two pole pairs. Specifically, it includes a permanent magnet 1, which comprises a ring structure formed by connecting end-to-end first magnetic blocks 11 and second magnetic blocks 12 in a Halbach array as repeating units; wherein the volume of the first magnetic blocks 11 is larger than the volume of the second magnetic blocks 12. There are a total of four repeating units: four first magnetic blocks 11 and four second magnetic blocks 12. The eight magnetic blocks are arranged in a clockwise cycle with magnetization of 0°, 90°, 180°, and 270°. The first magnetic blocks 11 are magnetized at 0° or 180°, and the second magnetic blocks 12 are magnetized at 90° or 270°. This forms two pole pairs.

[0070] The outer diameter od of the circular cavity 4 is 30mm, the number of pole pairs of the orientation device is 2, and od*π / (2*p) is 23.55mm. This orientation device has a wide magnetic pole.

[0071] The first magnetic block 11 and the second magnetic block 12 are sector-shaped magnetic blocks. The shortest distance from the first inner surface 5 of the first magnetic block 11 to the center of the mold is r, and the shortest distance from the second inner surface 6 of the second magnetic block 12 to the center of the mold is R, where R / r is 1.11. A magnetically conductive outer sleeve 2 is wrapped around the outside of the permanent magnet 1 and is made of magnetically conductive steel. A non-magnetically conductive inner sleeve 3 abuts against the annular inner wall of the permanent magnet 1 and is made of non-magnetic alloy. A circular mold cavity 4 is provided in the middle of the non-magnetically conductive inner sleeve 3, which is used to hold the molten injection-molded magnet.

[0072] Comparative Example 1

[0073] Comparative Example 1 uses a conventional Halbach display arrangement with an orientation device, specifically in... Figure 1 Based on this, the first magnetic block 11 and the second magnetic block 12 have the same volume and geometry. The annular structure is divided into 8 equal parts. The inner surfaces of the first and second magnetic blocks are both arc surfaces, and the inner wall of the entire annular structure is circular. The radius of curvature of the first and second magnetic blocks is set to... Figure 1 R in the text.

[0074] test:

[0075] The magnetic field strength (T) of the orientation devices of Example 1 and Comparative Example 1 was tested.

[0076] The specific testing process is as follows: The completed orientation device is placed on a dedicated magnetization characteristic measuring instrument to test its surface magnetic waveform curve. The obtained surface magnetic waveform curve is shown below. Figure 5 As shown.

[0077] Test results are as follows Figure 5 As shown, curve 1 is the magnetic flux density waveform of the alignment device manufactured by the method proposed in this patent, and curve 2 is the magnetic flux density waveform of the alignment device manufactured by a conventional Halbach array. A comparison of the two curves shows that the method proposed in this patent can effectively improve the smoothness of the surface magnetic flux waveform. The waveform is smoother than that of the alignment device manufactured by a conventional Halbach array. Therefore, products manufactured using this alignment device have more stable motor operation and less noise and vibration.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An orientation device for injection-molded magnets, characterized in that, include: The permanent magnet (1) comprises a ring structure formed by connecting the first magnetic block (11) and the second magnetic block (12) as repeating units in a Halbach arrangement. A magnetically conductive outer sleeve (2) is wrapped around the outside of the permanent magnet (1); A non-magnetic inner sleeve (3) abuts against the annular inner wall of the permanent magnet (1); The non-magnetic inner sleeve (3) has a circular mold cavity (4) in the middle, which is used to hold the injection-molded magnet melt; The volume of the first magnetic block (11) is not equal to the volume of the second magnetic block (12); The shortest distance from the first inner surface (5) of the first magnetic block (11) to the cavity wall (41) is less than the shortest distance from the second inner surface (6) of the second magnetic block (12) to the cavity wall (41); The shortest distance r from the first inner surface (5) of the first magnetic block (11) to the center of the mold and the shortest distance R from the second inner surface (6) of the second magnetic block (12) to the center of the mold have the following relationship: R / r≥1; The curvature K1 of the first inner surface (5) of the first magnetic block (11) and the curvature K2 of the second inner surface (6) of the second magnetic block (12) have the following relationship: K1 / K2<0.

2.

2. The orientation device for injection-molded magnets according to claim 1, characterized in that, The shortest distance r from the first inner surface (5) of the first magnetic block (11) to the center of the mold and the shortest distance R from the second inner surface (6) of the second magnetic block (12) to the center of the mold have the following relationship: 1.05≤R / r≤1.

4.

3. The orientation device for injection-molded magnets according to claim 1, characterized in that, The outer diameter od of the circular mold cavity (4) has the following relationship with the number of pole pairs 2*p of the orientation device: od*π / (2*p)>5 mm.

4. The orientation device for injection-molded magnets according to claim 1, characterized in that, The first inner surface (5) of the first magnetic block (11) is a straight surface or an arc surface, and the second inner surface (6) of the second magnetic block (12) is a straight surface or an arc surface. Among the contact points of the first magnetic block (11) and the second magnetic block (12), the point with the shortest distance from the center of the mold is located on the inner surface.

5. The orientation device for injection-molded magnets according to claim 4, characterized in that, The first magnetic block (11) and the second magnetic block (12) are sector-shaped magnetic blocks, and the central angle of the first magnetic block (11) is 20° to 60°.

6. The orientation device for injection-molded magnets according to claim 1, characterized in that, The permanent magnets (1) are arranged in a clockwise cycle of 0° magnetization, 90° magnetization, 180° magnetization and 270° magnetization; the first magnetic block (11) is magnetized at 0° or 180°, and the second magnetic block (12) is magnetized at 90° or 270°.

7. The orientation device for injection-molded magnets according to claim 2, characterized in that, The orientation device has 2 to 4 pole pairs.

8. The orientation device for injection-molded magnets according to any one of claims 1-7, characterized in that, The magnetic outer jacket (2) is made of a material with an initial relative permeability >50 and a saturation magnetization >1T. The non-magnetic inner sleeve (3) is made of a material with an initial relative permeability of <10.

9. A method for orientation molding using an orientation device for injection-molded magnets as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Assemble the orientation device for the injection-molded magnet as described in any one of claims 1-8, and install the assembled orientation device into the injection mold frame to form an injection mold. Step 2: Install the injection mold in the injection molding equipment; Step 3: The injection molten material is injected into the injection mold using an injection molding machine. During the molding process, the injection molten magnetic material is oriented under the action of the magnetic field in the orientation device to obtain the injection-molded magnet.

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