A method for three-dimensional orientation and magnetization of magnetic rings

Abstract

This invention belongs to the field of magnetic ring technology, and particularly relates to a method for three-dimensional orientation and magnetization of magnetic rings. The method includes a magnetic ring forming mold with an annular cavity for forming a magnetic ring forming space; the annular cavity is provided with an array of oriented magnets; the array of oriented magnets is formed by arranging multiple sheet magnets along the circumferential direction of the annular cavity; the array of oriented magnets includes at least one of an upper end face oriented magnet array, an outer circle oriented magnet array, a lower end face oriented magnet array, and an inner circle oriented magnet array; wherein the magnetization direction of the multiple sheet magnets is set to form an oriented magnetic field with at least two of radial, axial, or circumferential components within the annular cavity; a fluid material containing magnetic material fills the annular cavity to form a magnetic ring; the oriented magnetic field orients the magnetic material particles according to a preset direction during the magnetic ring forming process; after the magnetic ring solidifies, it is magnetized to give the magnetic ring a three-dimensional magnetic field.

Description

Technical Field

[0001] This invention belongs to the field of magnetic technology, and in particular relates to a three-dimensional orientation and magnetization method for a magnetic ring. Background Technology

[0002] Permanent magnetic materials are a crucial and widely used class of functional materials. Existing permanent magnet rings are generally produced through injection molding or powder molding. Injection-molded, bonded, and powder-molded magnets typically require the application of an orientation magnetic field during the molding process to align the easily magnetized magnetic particles in a predetermined direction. Common orientation methods include axial orientation, radial orientation, parallel orientation, multipole orientation, and local oblique orientation. For magnetic rings used in ordinary radial flux motors, the orientation magnetic field is usually established primarily radially; for magnets used in ordinary axial flux motors, the orientation magnetic field is usually established primarily axially. Therefore, traditional magnetic ring orientation molds often primarily employ a single radial or axial orientation, making it difficult to simultaneously meet the magnetization requirements of the upper, outer, and lower end faces. Furthermore, the orientation magnets are usually only arranged on the outer circumference or end face of the mold cavity, resulting in a singular spatial distribution of the magnetic field within the cavity and insufficient three-dimensional coupling. In a single-turn orientation magnet array, it is difficult to control the gradual change in orientation of the magnetic ring along the axial, radial, or thickness directions. When magnetic rings are used in multi-air-gap composite magnetic circuit motors, ordinary oriented magnetic rings are prone to problems such as weak end face magnetic field, strong outer circle magnetic field, or phase mismatch among multiple working surfaces after subsequent magnetization. Existing magnetic rings are generally suitable for magnets with a single working surface, but they are difficult to meet the requirement of simultaneously supplying magnets to multiple directions such as the upper end face, outer circle, lower end face, or inner circle of the same magnetic ring. Summary of the Invention

[0003] The purpose of this invention is to provide a three-dimensional orientation and magnetization method for a magnetic ring by arranging one or more rings of sheet-like oriented magnet arrays on the upper end face, outer circular face, lower end face and / or inner circular face of the annular mold cavity, so that the magnetic material in the mold cavity forms a three-dimensional orientation structure with radial, axial and circumferential components during the molding stage, so that the magnetic ring has a three-dimensional magnetic field after solidification and magnetization.

[0004] To achieve the above objectives, this invention provides a method for three-dimensional orientation and magnetization of a magnetic ring, used for magnetic ring forming, magnetic pole orientation, and magnetization. The method includes a magnetic ring forming mold with an annular cavity for forming a magnetic ring forming space. The annular cavity is provided with an array of oriented magnets. The array of oriented magnets is formed by arranging multiple sheet magnets along the circumferential direction of the annular cavity. The array of oriented magnets includes at least one of an upper end face oriented magnet array, an outer circle oriented magnet array, a lower end face oriented magnet array, and an inner circle oriented magnet array. The magnetization direction of the multiple sheet magnets is set to form an oriented magnetic field with at least two components (radial, axial, or circumferential) within the annular cavity. A fluid material containing magnetic material fills the annular cavity to form the magnetic ring. During the magnetic ring forming process, the oriented magnetic field orients the magnetic material particles according to a preset direction. After the magnetic ring solidifies, it is magnetized to give the magnetic ring a three-dimensional magnetic field.

[0005] Furthermore, the magnetic ring is injection molded within the annular mold cavity, and the orientation magnet array simultaneously completes the orientation and magnetization of the magnetic ring.

[0006] Furthermore, the magnetic pole directions of two adjacent sheet magnets of the plurality of sheet magnets are distributed at an angle and gradually change along the direction of the sheet magnet array.

[0007] Furthermore, the plurality of sheet magnets form several sets of orientation array cycles, and the first and last sheet magnets in the same orientation array cycle have the same magnetic poles.

[0008] Furthermore, the magnetic ring forming mold includes an outer mold and an inner mold, and the outer mold and / or the inner mold are provided with a plurality of mounting slots in an annular array, and each of the plurality of sheet magnets is disposed in the corresponding mounting slot.

[0009] Furthermore, the multiple sheet magnets of the outer mold and the inner mold are arranged at the same angle, and the magnetic poles of the two sheet magnets in the same radial direction are arranged in the same direction.

[0010] Furthermore, the outer mold includes an upper mold ring and a lower mold ring that are fitted together, and the inner ring of the outer mold has a semi-circular annular cavity; the upper mold ring and / or the lower mold ring are provided with an annular array of mounting grooves, the mounting grooves extending to the top side of the semi-circular annular cavity, and the sheet magnet is provided with an arc segment that extends to the top side of the semi-circular annular cavity.

[0011] Furthermore, the fluid material is metal powder. The metal powder containing the magnetic material is filled and compacted into the annular mold cavity to form the magnetic ring. After the magnetic ring formed by powder is sintered and solidified, it is placed in a magnetizing device to be magnetized, forming the magnetic ring with a three-dimensional magnetic field.

[0012] Furthermore, the magnetizing device includes at least three pairs of magnetizing coil groups, each group of magnetizing coil groups including an S-pole coil group and an N-pole coil group; the S-pole coil group and the N-pole coil group of the first group are opposite to the two sides of the magnetic ring, the S-pole coil group and the N-pole coil group of the second group are opposite to each other on the top side of the magnetic ring, and the S-pole coil group and the N-pole coil group of the third group are opposite to each other on the bottom side of the magnetic ring, with the S-pole coil group of the second group and the N-pole coil group of the third group opposite to each other.

[0013] Furthermore, both the S-pole coil group and the N-pole coil group include an armature and a coil wound around the outer ring of the armature; the cross-section of the armature is prismatic, and the thickness of the armature gradually decreases from the middle to both sides.

[0014] The above-mentioned technical solutions of the three-dimensional orientation and magnetization method of the magnetic ring provided in the embodiments of the present invention have at least the following technical effects: This method of three-dimensional orientation and magnetization of the magnetic ring utilizes a multi-faceted array of sheet magnets on the upper, outer, lower, and / or inner surfaces to achieve corresponding orientations on different working surfaces. The sheet magnet array can achieve gradual or helical orientations along the circumference, axis, or radial direction. After magnetization, it generates a magnetic field that rotates in three-dimensional space, which is beneficial for improving the effective magnetic performance of the magnetic ring on the upper, outer, and lower surfaces used in multi-air-gap composite magnetic circuits, and can meet the needs of magnetization in multiple directions. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the orientation structure of the three-dimensional orientation of the magnetic ring and the magnetization method provided for embodiments of the present invention.

[0017] Figure 2 This is a schematic diagram of an embodiment of a magnetic ring forming mold that provides a three-dimensional orientation and magnetization method for magnetic rings according to an embodiment of the present invention.

[0018] Figure 3 This is a front view of the orientation structure of the three-dimensional orientation and magnetization method of the magnetic ring provided in an embodiment of the present invention.

[0019] Figure 4 for Figure 3 AA sectional view.

[0020] Figure 5 for Figure 3 BB cross-sectional view.

[0021] Figure 6 for Figure 3 CC section view.

[0022] Figure 7 for Figure 3 DD sectional view.

[0023] Figure 8 This is a schematic diagram of another embodiment of a magnetic ring forming mold that provides a three-dimensional orientation and magnetization method for magnetic rings according to an embodiment of the present invention.

[0024] Figure 9 A cross-sectional view of a magnetic ring forming mold for providing a three-dimensional orientation and magnetization method for a magnetic ring according to an embodiment of the present invention.

[0025] Figure 10 This is a schematic diagram showing the vertical distribution of the orientation magnet array in the three-dimensional orientation and magnetization method of the magnetic ring, as provided in an embodiment of the present invention.

[0026] Figure 11 This is a schematic diagram of the lower mold ring for providing a three-dimensional orientation and magnetization method for a magnetic ring according to an embodiment of the present invention.

[0027] Figure 12 This is a schematic diagram of a magnetizing device for providing a three-dimensional orientation and magnetizing method for a magnetic ring according to an embodiment of the present invention.

[0028] Figure 13 A rendering of a magnetizing device for a three-dimensional orientation and magnetizing method of a magnetic ring, provided for an embodiment of the present invention.

[0029] Figure 14 A rendering of the magnetic ring formed by the three-dimensional orientation and magnetization method of the magnetic ring is provided for the embodiments of the present invention.

[0030] Figure 15 This is a schematic diagram of the polar plane of a magnetic ring formed by a three-dimensional orientation and magnetization method, provided for an embodiment of the present invention.

[0031] Figure 16 This diagram illustrates the three-dimensional orientation of the magnetic ring and the magnetic ring formed by the magnetization method, as provided in an embodiment of the present invention.

[0032] Figure 17 for Figure 16 A schematic diagram of the polar bisectors of the AA section.

[0033] Figure 18 for Figure 16 A schematic diagram of the polar bisectors of the CC section.

[0034] Figure 19 for Figure 16A schematic diagram of the polar bisectors of the BB section.

[0035] Figure 20 for Figure 16 A schematic diagram of the polar bisectors of the DD section. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0037] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0038] 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 one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0040] In one embodiment of the three-dimensional orientation and magnetization method of the magnetic ring of the present invention, please refer to... Figures 1 to 12 .in, Figure 1 and Figure 2 ,as well as Figures 8 to 10 This is a schematic diagram of a magnetic ring forming mold with an array of oriented magnets, which is part of the three-dimensional orientation and magnetization method of magnetic rings, but it is not a complete mold structure diagram. Figures 3 to 7 This is a schematic diagram of an oriented magnet array. Figure 12 It is a schematic diagram of the magnetization device after the magnetic ring powder is formed, but it is not a complete structural diagram.

[0041] The three-dimensional orientation and magnetization method of the magnetic ring in this embodiment realizes the forming, magnetic pole orientation and magnetization of the magnetic ring to complete the processing of the magnetic ring 100.

[0042] Specifically, refer to Figures 1 to 3 , Figures 8 to 10 The three-dimensional orientation and magnetization method for the magnetic ring in this embodiment includes a magnetic ring forming mold 200, which is provided with an annular cavity 201 for forming the forming space of the magnetic ring 100. The annular cavity 201 is provided with an orientation magnet array 300; the orientation magnet array 300 is formed by arranging a plurality of sheet magnets 310 along the circumferential direction of the annular cavity 201. The orientation magnet array 300 includes at least one of an upper end face orientation magnet array, an outer circle orientation magnet array, a lower end face orientation magnet array, and an inner circle orientation magnet array, and can also be a combination of multiple types. Specifically, The upper end face orientation magnet array is formed by arranging multiple sheet magnets 310 along the circumferential direction of the annular cavity 201 on the upper end side of the annular cavity 201 to achieve orientation of the upper end face of the magnetic ring 100.

[0043] The outer circular orientation magnet array is formed by arranging multiple sheet magnets 310 along the circumference of the annular cavity 201 on the outer ring of the annular cavity 201 to achieve orientation of the outer ring of the magnetic ring 100.

[0044] The lower end face orientation magnet array is formed by arranging multiple sheet magnets 310 along the circumferential direction of the annular cavity 201 on the lower end side of the annular cavity 201 to achieve orientation of the lower end face of the magnetic ring 100.

[0045] The inner circle orientation magnet array is formed by arranging multiple sheet magnets 310 along the circumference of the annular cavity 201 in the inner circle of the annular cavity 201 to achieve orientation of the inner circle of the magnetic ring 100.

[0046] In this process, the magnetization direction of multiple sheet magnets 310 is set to form an orientation magnetic field with at least two of the following components within the annular mold cavity 201: radial, axial, or circumferential. A fluid material containing magnetic material fills the annular mold cavity 201 to form a magnetic ring 100. During the molding process of the magnetic ring 100, the orientation magnetic field orients the magnetic material particles according to a preset direction. After the magnetic ring 100 solidifies, it is magnetized, giving it a three-dimensional magnetic field.

[0047] Furthermore, this embodiment provides an example of an injection molding process for a magnetic ring 100. Specifically, the magnetic ring 100 is injection molded within an annular mold cavity 201, and the orientation magnet array 300 simultaneously completes the orientation and magnetization of the magnetic ring 100. More specifically, the injection molding magnetic material includes thermoplastic resin and magnetic powder. The thermoplastic resin can be PA12, PA6, PA66, PPS, PEEK, or other engineering plastics; the magnetic powder can be NdFeB powder, ferrite powder, samarium cobalt powder, samarium iron nitrogen, or a combination thereof. During injection molding, the injection molding magnetic material is heated and plasticized before being injected into the annular mold cavity 201. During the filling, holding, and cooling processes, the composite orientation magnetic field within the annular mold cavity 201 continuously acts on the magnetic particles, causing the magnetic particles to align along the target orientation direction. After cooling and solidification, an injection-molded magnetic ring with a three-dimensional orientation structure is obtained. For a three-sided magnetized magnetic ring, it is preferable to set a sheet-like orientation magnet array 300 on the upper end face, outer circular face, or lower end face so that the upper end face, outer circular face, or lower end face of the injection-molded magnetic ring forms a corresponding orientation region.

[0048] Furthermore, the magnetic pole directions of two adjacent sheet magnets 310 are distributed at an angle and gradually change along the array direction of the sheet magnets 310. See [reference needed] for details. Figures 3 to 7 Each sheet magnet 310 has the same external shape, but the distribution direction of its magnetic poles differs. For example, in a complete array of oriented magnets 300, the S and N poles of the first sheet magnet 310 are vertical, and the dividing line is horizontal. The S and N poles of the second sheet magnet 310 along the array direction are deviated from the vertical direction, meaning the dividing line forms a certain angle with the horizontal. The size of this angle depends on the curvature of the array of oriented magnets 300 and the number of sheet magnets 310. More specifically, if a complete loop of the array of oriented magnets 300 has a curvature of 360° and the number of sheet magnets 310 is 36, then the deflection angle between two adjacent sheet magnets 310 is 10°; if the number of sheet magnets 310 is 360, then the deflection angle is 1°. Therefore, when the magnetic ring 100 is oriented, the magnetic material particles are oriented according to the magnetic pole direction of the sheet magnets 310 to achieve orientation in radial, circumferential, and other directions. This ensures that the magnetic ring 100 obtains a stable magnetic field with a continuously changing direction in the circumferential direction.

[0049] Furthermore, the multiple sheet magnets 310 in the orientation magnet array 300 form several sets of orientation array loops. These sets can be one or more, depending on the actual size of the magnetic ring 100 and specific requirements. The first and last sheet magnets 310 in the same orientation array loop have the same magnetic poles.

[0050] Furthermore, refer to Figure 1 and Figure 2The magnetic ring forming mold 200 includes an outer mold 210 and an inner mold 220. Multiple mounting grooves 202 are arranged in a ring array within the outer mold 210 and / or the inner mold 220. Each of the multiple sheet magnets 310 is positioned within its corresponding mounting groove 202. This allows for the orientation of the outer or inner circle of the magnetic ring 100.

[0051] Furthermore, the multiple sheet magnets 310 of the outer mold 210 and the inner mold 220 are arranged at the same angle, and the magnetic poles of two sheet magnets 310 in the same radial direction are arranged in the same direction. In this embodiment, this applies to the outer circular orientation magnet array and the inner circular orientation magnet array of the magnetic ring 100. Specifically, the number of sheet magnets 310 arranged in the outer mold 210 is the same as the number of sheet magnets 310 arranged in the inner mold 220, and they coincide radially. However, the magnetic poles of the two sheet magnets 310 in the radial direction are aligned, that is, the pole dividing lines are parallel.

[0052] For further details, please refer to... Figures 8 to 11 The outer mold 210 includes an upper mold ring 211 and a lower mold ring 212 that are fitted together. The inner ring of the outer mold 210, formed by the combination of the upper mold ring 211 and the lower mold ring 212, has a semi-circular annular cavity. Therefore, this embodiment can realize the forming of a magnetic ring 100 with an outer arc surface.

[0053] The upper mold ring 211 and / or the lower mold ring 212 are provided with a ring array of mounting grooves 202, which extend to the top side of the semi-circular annular cavity. The sheet magnet 310 is provided with an arc segment and extends to the top side of the semi-circular annular cavity.

[0054] Furthermore, this embodiment provides another molding example of the magnetic ring 100. Specifically, the fluid material is metal powder, and the metal powder containing magnetic material is filled and compacted into the annular mold cavity 201 to form a magnetic ring. After the magnetic ring formed by powder molding is sintered and cured, it is placed in the magnetizing device 400 for magnetization, forming a magnetic ring 100 with a three-dimensional magnetic field. Specifically, the magnetic material is powder-molded magnetic material. After filling the annular mold cavity 201 with magnetic powder or a magnetic powder mixture containing binder, a composite orientation magnetic field is established in the annular mold cavity using a sheet-like orientation magnet array 300 on the upper end face, outer circular surface, lower end face, and / or inner circular surface. Subsequently, it is pressed by an upper pressure head, a lower pressure head, or a radial pressing mechanism, so that the magnetic powder forms an annular magnetic blank while maintaining the orientation magnetic field. The magnetic blank can be further thermosetting, sintering, impregnating, machining, or subsequently three-dimensionally magnetized. The powder molding path is suitable for ferrite magnetic powder, rare earth permanent magnet powder, neodymium iron boron powder, samarium cobalt powder, or magnetic powder systems containing binders.

[0055] Furthermore, refer to Figure 12 and Figure 13 . Figure 13This is a rendering of the magnetizing device 400; the red part represents the S pole, and the blue part represents the N pole. The magnetizing device 400 includes at least three pairs of magnetizing coil groups, each magnetizing coil group including an S pole coil group 410 and an N pole coil group 420.

[0056] In this configuration, the first group of S-pole coils 410 and N-pole coils 420 are positioned opposite each other on both sides of the magnetic ring 100. The second group of S-pole coils 410 and N-pole coils 420 are positioned opposite each other on the top side of the magnetic ring 100. The third group of S-pole coils 410 and N-pole coils 420 are positioned opposite each other on the bottom side of the magnetic ring 100. The second group of S-pole coils 410 and the third group of N-pole coils 420 are positioned opposite each other, and the second group of N-pole coils and the third group of S-pole coils are positioned opposite each other. Therefore, the first group of S-pole coils 410 and N-pole coils 420 on the top and bottom sides can also form a magnetizing coil group. Furthermore, the number of magnetizing coil groups on the top and bottom sides of the magnetic ring 100 can be multiple, specifically determined by the number of cycles in the orientation array.

[0057] Furthermore, both the S-pole coil group 410 and the N-pole coil group 420 include an armature 401 and an electromagnetic coil 402 wound around the outer ring of the armature 401. The electromagnetic coil 402 causes the armature 401 to form a strong magnet, and magnetizes the magnetic ring 100. The magnetic pole direction of the magnetic ring 100 is set at an angle according to the orientation of the magnetic ring 100.

[0058] More preferably, refer to Figure 12 The armatures 402 located on both sides of the outer circle of the magnetic ring 100 have a prismatic cross-section, and the thickness of the armatures 402 gradually decreases from the middle to both sides. In this embodiment, the orientation of the armatures 402 can be better adapted to the orientation and magnetization component of the magnetic ring 100 by adjusting the angle of the armatures 402 on both sides.

[0059] Furthermore, the armature 402 located on the upper and lower end faces can also be tilted towards the magnetic ring 100, so that the orientation of the armature 402 on the upper and lower end faces can better adapt to the orientation and magnetization component of the upper and lower end faces of the magnetic ring 100.

[0060] The magnetic particle orientation direction in the magnetic ring 100 obtained by the three-dimensional orientation and magnetization method of the above embodiment includes at least two of the following: radial orientation component, axial orientation component, or circumferential orientation component, so that the polar plane of the magnetic ring 100 is a twisted spiral circular surface. See details... Figures 14 to 20 ;in Figure 14 This is a rendering of a magnetic ring. The red part represents the S pole of magnetic ring 100, and the blue part represents the N pole of magnetic ring 100. The S and N poles of magnetic ring 100 gradually deflect along the circumferential direction. The magnetic poles of magnetic ring 100 can form at least one turning cycle along the circumferential direction.

[0061] The above are merely preferred embodiments of the present invention and are 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. A method for three-dimensional orientation and magnetization of a magnetic ring, used for magnetic ring forming, magnetic pole orientation, and magnetization; characterized in that, The device includes a magnetic ring forming mold, which has an annular cavity for forming a magnetic ring forming space. The annular cavity is provided with an array of oriented magnets. The array of oriented magnets is formed by arranging multiple sheet magnets along the circumference of the annular cavity. The array of oriented magnets includes at least one of an upper end face oriented magnet array, an outer circle oriented magnet array, a lower end face oriented magnet array, and an inner circle oriented magnet array. The magnetization direction of the multiple sheet magnets is set to form an oriented magnetic field with at least two components (radial, axial, or circumferential) within the annular cavity. A fluid material containing magnetic material fills the annular cavity to form the magnetic ring. During the magnetic ring forming process, the oriented magnetic field orients the particles of the magnetic material according to a preset direction. After the magnetic ring solidifies, it is magnetized to give the magnetic ring a three-dimensional magnetic field.

2. The three-dimensional orientation and magnetization method of the magnetic ring according to claim 1, characterized in that: The magnetic ring is injection molded within the annular mold cavity, and the orientation magnet array simultaneously completes the orientation and magnetization of the magnetic ring.

3. The three-dimensional orientation and magnetization method of the magnetic ring according to claim 1, characterized in that: The magnetic poles of two adjacent sheet magnets of the plurality of sheet magnets are distributed at an angle and gradually change along the direction of the sheet magnet array.

4. The three-dimensional orientation and magnetization method of the magnetic ring according to claim 3, characterized in that: The plurality of sheet magnets form several sets of orientation array cycles, and the first and last sheet magnets in the same orientation array cycle have the same magnetic poles.

5. The three-dimensional orientation and magnetization method of the magnetic ring according to claim 1, characterized in that: The magnetic ring forming mold includes an outer mold and an inner mold. The outer mold and / or the inner mold are provided with a plurality of mounting slots in a ring array. Each of the plurality of sheet magnets is disposed in the corresponding mounting slot.

6. The three-dimensional orientation and magnetization method of the magnetic ring according to claim 5, characterized in that: The multiple sheet magnets of the outer mold and the inner mold are arranged at the same angle, and the magnetic poles of the two sheet magnets in the same radial direction are arranged in the same direction.

7. The three-dimensional orientation and magnetization method of the magnetic ring according to claim 5, characterized in that: The outer mold includes an upper mold ring and a lower mold ring that are fitted together. The inner ring of the outer mold has a semi-circular annular cavity. The upper mold ring and / or the lower mold ring have an array of mounting grooves that extend to the top side of the semi-circular annular cavity. The sheet magnet has an arc segment that extends to the top side of the semi-circular annular cavity.

8. The method for three-dimensional orientation and magnetization of a magnetic ring according to any one of claims 2 to 7, characterized in that: The fluid material is metal powder. The metal powder containing the magnetic material is filled and compacted into the annular mold cavity to form the magnetic ring. After the magnetic ring formed by powder is sintered and solidified, it is placed in a magnetizing device to be magnetized, forming the magnetic ring with a three-dimensional magnetic field.

9. The three-dimensional orientation and magnetization method of the magnetic ring according to claim 8, characterized in that: The magnetizing device includes at least three pairs of magnetizing coil groups, each group including an S-pole coil group and an N-pole coil group; the S-pole coil group and the N-pole coil group of the first group are opposite to the two sides of the magnetic ring, the S-pole coil group and the N-pole coil group of the second group are opposite to each other on the top side of the magnetic ring, and the S-pole coil group and the N-pole coil group of the third group are opposite to each other on the bottom side of the magnetic ring, with the S-pole coil group of the second group and the N-pole coil group of the third group opposite to each other.

10. The three-dimensional orientation and magnetization method of the magnetic ring according to claim 9, characterized in that: Both the S-pole coil group and the N-pole coil group include an armature and a coil wound around the outer ring of the armature; the cross-section of the armature is prismatic, and the thickness of the armature gradually decreases from the middle to both sides.

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