Magnetic steel structure and manufacturing method thereof, motor and vehicle

Abstract

The invention relates to a magnetic steel structure and a manufacturing method thereof, a motor and a vehicle. The magnetic steel structure comprises a main body block; the magnetic steel structure comprises a main body block and corner blocks located at the four corners of the main body block, the main body block and the corner blocks are of a split structure, and the corner blocks and the main body block are connected to jointly form the magnetic steel structure. The corner area most sensitive to heat in the magnetic steel structure is divided into the corner blocks, targeted heavy rare earth element grain boundary diffusion can be carried out on the corner blocks, and therefore the coercive force of the area is improved, the magnetic steel structure is more resistant to temperature, and the overall magnetic performance of the magnetic steel structure can be effectively improved. Moreover, the cost increase caused by grain boundary diffusion in other unexpected areas can be avoided, and the cost of the magnetic steel structure is further reduced on the basis of ensuring the performance of the magnetic steel structure.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motors, and in particular to a magnetic steel structure and a manufacturing method thereof, a motor and a vehicle. Background Art

[0002] As the requirements for motor performance increase, the requirements for motor magnet performance also increase. In the related art, heavy rare earth elements are used to diffuse the grain boundaries of magnets to ensure the magnetic properties of magnets. However, the cost of heavy rare earth elements is relatively high. How to reduce the amount of heavy rare earth elements is an urgent problem to be solved in this field. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a magnetic steel structure and a manufacturing method thereof, a motor and a vehicle.

[0004] According to a first aspect of an embodiment of the present disclosure, a magnetic steel structure is provided, comprising: a main body block; and corner blocks located at the four corners of the main body block, wherein the main body block and the corner blocks are constructed as a split structure, and the corner blocks are connected to the main body block to jointly construct the magnetic steel structure.

[0005] Optionally, along a first direction, the ratio of the size of the corner block to the size of the magnetic steel structure is one quarter to one third, and the first direction is the magnetization direction of the magnetic steel structure.

[0006] Optionally, in a direction perpendicular to a joining surface between the corner block and the main body block, a size of the corner block is 3 mm to 4 mm.

[0007] Optionally, two of the outer surfaces of the corner block are formed by parts of two adjacent side surfaces of the magnetic steel structure, and the other two are formed by parts of two opposite side surfaces of the magnetic steel structure.

[0008] Optionally, the butt joint surface between the corner block and the main body block is inclined to the magnetization direction of the magnetic steel structure.

[0009] Optionally, the corner block is configured as a right triangular prism, and the right triangular prism is configured to extend along a second direction, and the second direction is perpendicular to a magnetization direction of the magnetic steel structure.

[0010] Optionally, the cross section of the right triangular prism is configured as an isosceles triangle.

[0011] Optionally, the magnetic steel structure is constructed as a cuboid and has four corners in the projection along the second direction, the number of the corner blocks is four, and the second direction is perpendicular to the magnetization direction of the magnetic steel structure.

[0012] Optionally, the main block includes a center block and a side block, the center block is located in the middle area, the side blocks are located on both sides of the center block along a third direction, and the corner blocks are located at the corners of the side blocks away from the center block, and the third direction is perpendicular to the magnetization direction of the magnetic steel structure.

[0013] Optionally, at each side of the central block along the third direction, the side block includes at least one split block.

[0014] Optionally, the material of the main block is different from the material of the corner block.

[0015] Optionally, the material of the main block includes neodymium iron boron material, and the material of the corner block includes terbium element.

[0016] According to a second aspect of an embodiment of the present disclosure, a method for manufacturing a magnetic steel structure is provided, which is applied to the magnetic steel structure provided by the present disclosure, and the manufacturing method comprises: using a first material to respectively manufacture the main block and the corner block; using a second material to perform grain boundary diffusion on the corner block; and connecting the main block with the corner block.

[0017] Optionally, the cross-section of the corner block is constructed as an isosceles triangle, and the step of using the second material to perform grain boundary diffusion on the corner block includes: arranging a plurality of the corner blocks along a preset direction, and butting the isosceles sides of each two adjacent corner blocks among the plurality of corner blocks; and using the second material to perform grain boundary diffusion on the plurality of arranged corner blocks on one side of the base of the isosceles triangle.

[0018] Optionally, the step of using the second material to perform grain boundary diffusion on the corner blocks includes: connecting two of the corner blocks with one side thereof for docking with the main block as a group, and stacking multiple groups of the corner blocks into multiple layers; and performing grain boundary diffusion on the multiple layers of the corner blocks on at least one side of the arrangement direction of the multiple groups of the corner blocks.

[0019] According to a third aspect of an embodiment of the present disclosure, a motor is provided, comprising a rotor and a magnetic steel structure mounted on the rotor, wherein the magnetic steel structure is the magnetic steel structure provided by the present disclosure.

[0020] According to a fourth aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the motor provided by the present disclosure.

[0021] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the most heat-sensitive corner area in the magnetic steel structure is divided into corner blocks, and the grain boundary diffusion of heavy rare earth elements can be carried out in a targeted manner for the corner blocks, thereby increasing the coercivity of the area to be more tolerant to temperature, thereby effectively improving the magnetic properties of the magnetic steel structure as a whole. In addition, the cost increase caused by grain boundary diffusion in other undesirable areas can be avoided, and the cost of the magnetic steel structure can be further reduced on the basis of ensuring the performance of the magnetic steel structure.

[0022] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0024] Figure 1 is a three-dimensional diagram of a magnetic steel structure according to an exemplary embodiment.

[0025] Figure 2 is a top view of a magnetic steel structure according to an exemplary embodiment.

[0026] Figure 3 is a top view of another magnetic steel structure according to an exemplary embodiment.

[0027] Figure 4 FIG. 4 is a diagram showing an arrangement of corner blocks during grain boundary diffusion according to an exemplary embodiment.

[0028] Figure 5 yes Figure 4 Front view of .

[0029] Figure 6 FIG. 4 is another arrangement diagram of corner blocks during grain boundary diffusion according to an exemplary embodiment.

[0030] Figure 7 yes Figure 6 Front view of .

[0031] Figure 8 The figure is a flow chart of a method for manufacturing a magnetic steel structure according to an exemplary embodiment.

[0032] Fig. 9 The figure is a flow chart of a method for manufacturing a magnetic steel structure according to an exemplary embodiment.

[0033] Fig.10 The figure is a flow chart of a method for manufacturing a magnetic steel structure according to an exemplary embodiment.

[0034] Description of Reference Numerals 10-main body block, 11-center block, 12-side block, 20-corner block, 21-outer surface, 22-isosceles side, 23-bottom side. DETAILED DESCRIPTION

[0035] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0036] As the requirements for motor performance increase, the requirements for motor magnet performance also increase. In the related art, heavy rare earth elements are used to diffuse the grain boundaries of magnets to ensure the magnetic properties of magnets. However, the cost of heavy rare earth elements is relatively high, and how to reduce the amount of heavy rare earth elements is an urgent problem to be solved in this field. The general way to improve the performance of magnets is to use heavy rare earth elements to diffuse the grain boundaries of the entire magnet, or to cut the magnet into three regular rectangular blocks in one dimension direction, that is, Figure 1 The side blocks 12 on both sides of the middle are constructed in an integrated form with the connected corner blocks 20, and the side is cut in one piece to form a segmented way of connecting three rectangular blocks into a magnetic steel structure, and the rectangular structures on both sides are subjected to grain boundary diffusion. The existing solutions cannot reduce the cost to the minimum, and there will still be some redundant waste of heavy rare earth elements, and the utilization rate of heavy rare earth elements needs to be improved.

[0037] In order to solve this technical problem, the present disclosure provides a magnetic steel structure, referring to Figures 1 to 3 The magnetic steel structure may include a main body block 10 and a corner block 20. The corner block 20 is located at the four corners of the main body block 10. The main body block 10 and the corner block 20 are constructed as a split structure, and the corner block 20 is connected to the main body block 10 to form a magnetic steel structure together. Here, it should be noted that the corner refers to the corner area after the magnetic steel structure is installed in the magnetic steel slot of the rotor. For example, when the magnetic steel structure is installed in the rotor, it presents as follows Figure 2 and Figure 3 When the shape is shown, the corners refer to the upper left corner, lower left corner, upper right corner and lower right corner in the figure. During the operation of the motor, the most heat-sensitive part of the magnetic steel structure is the corner. The coercive force at the corner of the magnetic steel structure largely determines the magnetic properties of the entire magnetic steel. If the existing "one-size-fits-all" method is adopted on both sides, there will be excess waste of heavy rare earth elements in some areas of the magnetic steel blocks on both sides. In the embodiment of the present disclosure, a targeted segmentation scheme is adopted to carry out grain boundary diffusion.

[0038] Through the above technical solution, the most heat-sensitive corner area in the magnetic steel structure is divided into corner blocks 20, and the grain boundary diffusion of heavy rare earth elements can be carried out in a targeted manner for the corner blocks 20, thereby increasing the coercivity of the area to be more tolerant to temperature, thereby effectively improving the magnetic properties of the magnetic steel structure as a whole. In addition, the cost increase caused by grain boundary diffusion in other undesirable areas can be avoided, and the cost of the magnetic steel structure can be further reduced on the basis of ensuring the performance of the magnetic steel structure.

[0039] In a second aspect of the embodiment of the present disclosure, a method for manufacturing the magnetic steel structure provided in the embodiment of the present disclosure is further provided, referring to Figure 8 , the manufacturing method comprises: In S101, the main body block 10 and the corner block 20 are respectively made of a first material, and the first material is, for example, neodymium iron boron material; wherein, the first material is used to make the main body block 10 and the corner block 20 respectively by first making the entire magnetic steel structure and then dividing it, or by directly using the first material to make the main body block 10 and the corner block 20 into corresponding shapes respectively.

[0040] In S102, a second material is used to perform grain boundary diffusion on the corner block 20. The second material may be a heavy rare earth element to increase the coercivity of the corner block 20. For example, dysprosium may be used to perform grain boundary diffusion on the corner block 20. And In S103, the main body block 10 and the corner block 20 are connected. The connection method may be bonding, or forming mortise and tenon structures on the main body block 10 and the corner block 20 respectively and then riveting them.

[0041] In the embodiment of the present disclosure, the cross section of the corner block 20 can be configured as an isosceles triangle. Fig. 9 , S102 may include: In S1021, a plurality of corner blocks 20 are arranged along a preset direction, such as along Figure 4 The preset direction arrangement shown in Figure 4 and Figure 5 As shown, the isosceles sides 22 of each two adjacent corner blocks 20 in the plurality of corner blocks 20 are butted; and In S1022, a second material is used to perform grain boundary diffusion on the arranged corner blocks 20 on one side of the base 23 of the isosceles triangle. Figure 5 The upper surface or the lower surface of the arrangement is used to perform grain boundary diffusion on the multiple corner blocks 20. The corner blocks 20 are arranged in an isosceles triangle shape in cross section, which makes it easier to arrange the corner blocks 20, and the multiple corner blocks 20 can be arranged in one layer, which is more convenient for the penetration of heavy rare earth elements.

[0042] In the embodiment of the present disclosure, the size of the corner block 20 in the direction perpendicular to the interface between the corner block 20 and the main block 10 may be 3 mm to 4 mm. Figure 5The thickness in the upper and lower directions is 3mm~4mm. During grain boundary diffusion, the thickness of the corner block 20 is relatively small. Even if the edge of the outer surface of the magnetic steel structure of the corner block 20 is tilted, it will not affect the penetration effect. There is even no need to flip the corner block 20 for penetration on both sides, thus reducing the operation steps.

[0043] In other embodiments, Fig.10 As shown, S102 may include: In S1023, two corner blocks 20 are connected to each other at one side thereof for connecting with the main body block 10 as a group, and multiple groups of corner blocks 20 are stacked into multiple layers, such as Figure 6 and Figure 7 as shown; and In step S1024, grain boundary diffusion is performed on the multiple layers of corner blocks 20 on at least one side of the arrangement direction of the multiple groups of corner blocks 20, such as Figure 7 Grain boundary diffusion is carried out on the four sides of the drawing direction to ensure the penetration effect.

[0044] In the embodiment of the present disclosure, along the first direction, the ratio of the size of the corner block 20 to the size of the magnetic steel structure can be one quarter to one third, and the first direction is the magnetization direction of the magnetic steel structure. Figure 1 Taking the rectangular parallelepiped magnetic steel structure shown in the figure as an example, the first direction is the width direction of the rectangular parallelepiped shown in the figure, that is, the size of the corner block 20 in this direction accounts for one quarter to one third of the width of the magnetic steel structure, so as to ensure that the magnetic density area at the corner that is more sensitive to heat can be completely divided, and to ensure that there is no excessive division to waste heavy rare earth elements. The division size of the other side of the corner block 20 can be set to be the same as its division size in the width direction of the magnetic steel structure.

[0045] Reference Figure 1 As shown, two of the outer surfaces 21 of the corner block 20 are formed by parts of two adjacent side surfaces of the magnetic steel structure, and the other two are formed by parts of two opposite side surfaces of the magnetic steel structure. That is, the corner block 20 has four outer surfaces to ensure that the corner block 20 occupies the corner area of ​​the magnetic steel structure, rather than all the side areas of the magnetic steel structure. The outer surface here refers to the surface that constitutes the outer surface of the magnetic steel structure, and the surface of the corner block 20 that is connected to the main block 10 constitutes the inner surface.

[0046] The butt joint surface between the corner block 20 and the main block 10 is inclined to the magnetization direction of the magnetic steel structure. Figure 1 The butt joint surface is inclined in this direction, which can ensure that the corner block 20 is divided into areas as required. Different from the solution in the prior art where the dividing surface is parallel to the magnetization direction, the corner block 20 in the embodiment of the present disclosure is more targeted.

[0047] In one embodiment, the corner block 20 can be constructed as a straight triangular prism, which is configured to extend along a second direction perpendicular to the magnetization direction of the magnetic steel structure. The straight triangular prism is more convenient for grain boundary diffusion and ensures consistency along the second direction during grain boundary diffusion.

[0048] The cross section of the right triangular prism can be constructed as an isosceles triangle to facilitate grain boundary diffusion. In other embodiments, it can also be adjusted to other shapes according to the actual magnetic density area at the corner, such as an unequal right triangle.

[0049] In one embodiment, the magnetic steel structure can be constructed as a cuboid and has four corners in the projection along the second direction, and the number of corner blocks 20 is four to ensure that grain boundary diffusion can be carried out at each corner and the performance is consistent at each corner. The second direction is perpendicular to the magnetization direction of the magnetic steel structure.

[0050] In the embodiment of the present disclosure, the main body block 10 can be composed of a magnetic steel block, that is, a whole undivided magnetic steel block, such as Figure 3 shown.

[0051] In another embodiment, if Figure 1 and Figure 2 As shown, the main block 10 may include a central block 11 and a side block 12, wherein the central block 11 is located in the middle area, the side blocks 12 are located on both sides of the central block 11 along the third direction, and the corner blocks 20 are located at the corners of the side blocks 12 away from the central block 11, and the third direction is perpendicular to the magnetization direction of the magnetic steel structure. By further dividing the main block 10, the performance of different areas of the magnetic steel structure can be improved. For example, more expensive and better heavy rare earth elements can be used for grain boundary diffusion, while relatively low-cost heavy rare earth elements can be used for grain boundary diffusion of the side blocks 12, and lower-cost heavy rare earth elements can be used for grain boundary diffusion of the central block 11, or grain boundary diffusion treatment can be omitted. In one embodiment, terbium elements can be used for grain boundary diffusion in the corner blocks 20, dysprosium elements can be used for grain boundary diffusion in the side blocks 12, and the central block 11 can be left untreated.

[0052] In which, at each side of the central block 11 along the third direction, the side block 12 may include at least one split block. For example, the side block 12 may be further divided into two, three or more split blocks for more detailed division.

[0053] By dividing the magnetic steel structure in the embodiment of the present disclosure, the material of the main block 10 and the material of the corner block 20 can be set to be different, so as to make different treatments for different areas of the magnetic steel structure and improve the overall performance of the magnetic steel structure. For example, as described above, the main block 10 may include a neodymium iron boron material, and the corner block 20 may include a terbium element.

[0054] In a third aspect of the embodiments of the present disclosure, a motor is provided, comprising a rotor and a magnetic steel structure mounted on the rotor, wherein the magnetic steel structure is the magnetic steel structure described above. The motor has all the beneficial effects of the magnetic steel structure described above, which will not be described in detail here.

[0055] According to a fourth aspect of the embodiments of the present disclosure, a vehicle is provided, comprising the above-mentioned motor and having all the beneficial effects of the above-mentioned motor.

[0056] In the above detailed description, reference is made to the accompanying drawings, which illustrate specific aspects of the present disclosure that can be practiced by way of illustration. In this regard, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating directions or representing positional relationships, can be used with reference to the orientation of the described figures. Since the components of the described device can be positioned in a plurality of different orientations, directional terms can be used for illustrative purposes rather than restrictive. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concepts of the present disclosure. Therefore, the following detailed description should not be considered in a limiting sense.

[0057] It should be understood that, unless otherwise specifically noted, the features of some embodiments of the various present disclosures described herein may be combined with each other. As used herein, the term "and / or" includes any one of the related listed items and any combination of any two or more; similarly, "at least one of . . . " includes any one of the related listed items and any combination of any two or more.

[0058] It should be understood that, unless otherwise clearly specified and limited, the terms "joining", "attaching", "installing", "connecting", "connecting", "fixing" and the like used in the embodiments of the present disclosure should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0059] In addition, the term "above" used in relation to a component, element or material layer formed "above" or located "above" a surface may be used herein to indicate that the component, element or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements or layers are arranged between the surface and the component, element or material layer. However, the term "above" used in relation to a component, element or material layer formed "above" or located "above" a surface may also optionally have a specific meaning: the component, element or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, such as in direct contact with the surface.

[0060] Although terms such as "first", "second" and "third" can be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, component, region, layer or section from another component, component, region, layer or section. Therefore, without departing from the teachings of each example, the first component, component, region, layer or section mentioned in the examples described herein may also be referred to as the second component, component, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may expressly or implicitly include at least one of the features. In the description herein, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] It should be understood that spatially relative terms such as "above", "upper", "below", and "lower" are used herein to describe the relationship of one element to another element shown in the figures. In addition to the orientation depicted in the drawings, such spatially relative terms are also intended to include different orientations of the device in use or operation. For example, if the device in the drawings is turned over, the element described as being "above" or "upper" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" includes both upper and lower orientations. The device may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0062] In addition, the word "exemplary" is used herein to indicate serving as an example, instance, or diagram. Any aspect or design described as "exemplary" in this article is not necessarily understood to be advantageous compared to other aspects or designs. On the contrary, the use of the word exemplary is intended to present concepts in a specific way. As used herein, the term "or" is intended to represent an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to represent any one of the natural inclusive arrangements. That is, if X applies A; X applies B; or X applies both A and B, "X applies A or B" is satisfied under any of the aforementioned examples. In addition, unless otherwise specified or clearly pointed to a singular form from the context, the articles "one" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0063] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art after reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if the structure is not equivalent to the disclosed structure. In addition, although specific features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and beneficial to any given or specific application. In addition, with respect to "including", "having", "having", "having", or variations thereof used in a specific embodiment or claim, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0064] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0065] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A magnetic steel structure, characterized in that: include: Main block; as well as Corner blocks are located at the four corners of the main body block. The main body block and the corner blocks are constructed as a split structure, and the corner blocks are connected to the main body block to jointly construct the magnetic steel structure.

2. The magnetic steel structure according to claim 1, characterized in that: Along a first direction, the ratio of the size of the corner block to the size of the magnetic steel structure is one quarter to one third, and the first direction is the magnetization direction of the magnetic steel structure.

3. The magnetic steel structure according to claim 1, characterized in that: In a direction perpendicular to the butt joint surface between the corner block and the main body block, the size of the corner block is 3 mm to 4 mm.

4. The magnetic steel structure according to claim 1, characterized in that: Two of the outer surfaces of the corner block are formed by portions of two adjacent side surfaces of the magnetic steel structure, and the other two are formed by portions of two opposite side surfaces of the magnetic steel structure.

5. The magnetic steel structure according to claim 1, characterized in that: The butt joint surface between the corner block and the main body block is inclined to the magnetization direction of the magnetic steel structure.

6. The magnetic steel structure according to claim 1, characterized in that: The corner block is configured as a right triangular prism, and the right triangular prism is configured to extend along a second direction, and the second direction is perpendicular to a magnetization direction of the magnetic steel structure.

7. The magnetic steel structure according to claim 6, characterized in that: The cross section of the right triangular prism is configured as an isosceles triangle.

8. The magnetic steel structure according to claim 1, characterized in that: The magnetic steel structure is constructed as a cuboid and has four corners in a projection along a second direction. The number of the corner blocks is four. The second direction is perpendicular to the magnetization direction of the magnetic steel structure.

9. The magnetic steel structure according to claim 1, characterized in that: The main block includes a central block and side blocks, wherein the central block is located in the middle area, the side blocks are located on both sides of the central block along a third direction, and the corner blocks are located at the corners of the side blocks away from the central block, and the third direction is perpendicular to the magnetization direction of the magnetic steel structure.

10. The magnetic steel structure according to claim 9, characterized in that: At each side of the central block along the third direction, the side block includes at least one split block.

11. The magnetic steel structure according to any one of claims 1 to 10, characterized in that: The material of the main body block is different from the material of the corner block.

12. The magnetic steel structure according to claim 11, characterized in that: The material of the main block includes neodymium iron boron material, and the material of the corner block includes terbium element.

13. A method for manufacturing a magnetic steel structure, characterized in that: The magnetic steel structure applied to any one of claims 1 to 12, wherein the manufacturing method comprises: The main body block and the corner block are made of a first material respectively; Using a second material to perform grain boundary diffusion on the corner block; and Connect the main body block to the corner blocks.

14. The method for manufacturing a magnetic steel structure according to claim 13, characterized in that: The cross section of the corner block is an isosceles triangle, and the step of using the second material to perform grain boundary diffusion on the corner block comprises: Arrange the plurality of corner blocks along a preset direction, and butt the isosceles sides of each two adjacent corner blocks among the plurality of corner blocks; and The second material is used to perform grain boundary diffusion on the arranged plurality of corner blocks on one side of the base of the isosceles triangle.

15. The method for manufacturing a magnetic steel structure according to claim 13, characterized in that: The step of using the second material to perform grain boundary diffusion on the corner block comprises: Connecting two corner blocks at one side for connecting with the main body block into a group, and stacking multiple groups of corner blocks into multiple layers; and Grain boundary diffusion is performed on multiple layers of the corner blocks on at least one side of the arrangement direction of the multiple groups of the corner blocks.

16. A motor, characterized in that: It comprises a rotor and a magnetic steel structure installed on the rotor, and the magnetic steel structure is the magnetic steel structure according to any one of claims 1-12.

17. A vehicle, characterized in that: Comprising an electric machine according to claim 16.

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