Magnet and motor

Abstract

The utility model belongs to the technical field of magnets, and discloses a magnet and a motor, the magnet is provided with a magnetic surface perpendicular to the orientation direction of a magnetic field, the magnetic surface is divided into a middle area and two corner areas, the two corner areas are located on the two sides of the middle area in the first direction, and the two corner areas are located on the two sides of the middle area in the second direction. Each corner area is provided with at least one first separation groove; wherein the first direction is the length direction of the magnet. The magnet provided by the utility model has relatively low risk of loss of excitation and relatively high reliability, and the motor provided by the utility model has relatively high working efficiency and relatively low energy consumption.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnet technical field especially relates to a magnet and motor. BACKGROUND

[0002] Neodymium iron boron magnet is the largest magnetic material of magnetic energy product at present, can provide the biggest magnetic field in the similar material, is widely used in new energy automobile, wind power, energy-saving motor and other fields.

[0003] The neodymium iron boron magnet in prior art is usually a whole structure, and when the conductor moves in the non-uniform magnetic field or is in the magnetic field changing with time, induced current will be generated in the conductor, and the current forms a closed current line in the conductor, which is called eddy current (also called Foucault current). The neodymium iron boron magnet is usually bonded or inlaid on the rotor body of the motor, and is affected by the alternating current of the stator of the motor, so that the neodymium iron boron magnet itself generates induced eddy current, resulting in rapid temperature rise of the neodymium iron boron magnet. When the temperature exceeds the working temperature of the neodymium iron magnet, the neodymium iron boron magnet is easy to lose magnetism, and the existence of the induced eddy current reduces the working efficiency of the motor and increases the energy consumption.

[0004] Therefore, there is an urgent need for a magnet that reduces the generation of induced eddy current to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a magnet and motor, the magnet has lower risk of losing magnetism, higher reliability, improves the working efficiency of the motor and reduces the energy consumption.

[0006] According to the above idea, the technical scheme adopted by the utility model is:

[0007] The magnet has a magnetic surface perpendicular to the orientation direction of the magnetic field, the magnetic surface is divided into an intermediate region and two corner regions, the two corner regions are located on both sides of the intermediate region in a first direction, and each corner region is provided with at least one first separation groove.

[0008] Optionally, the magnet comprises an insulating adhesive layer and a plurality of magnetic parts, the plurality of magnetic parts are sequentially arranged along a second direction, and two adjacent magnetic parts in the second direction are bonded by the insulating adhesive layer. At least one magnetic part has the magnetic surface. The second direction is perpendicular to the first direction.

[0009] Optionally, the thickness of the insulating adhesive layer ranges from 50 μm to 150 μm.

[0010] And / or,

[0011] The insulating adhesive layer comprises a resin structure and solid particles embedded in the resin structure, wherein the average diameter of the solid particles ranges from 10 to 18 microns.

[0012] Optionally, the plurality of magnetic portions comprises two edge magnetic portions and at least one intermediate magnetic portion arranged between the two edge magnetic portions, and the two edge magnetic portions are arranged on two surfaces opposite to each other, and the two surfaces are the magnetic surfaces.

[0013] The intermediate magnetic portion has the magnetic surface; or the magnetic surfaces of the magnet are located on the edge magnetic portions.

[0014] Optionally, each of the corner regions is provided with a plurality of first separation grooves, and the plurality of first separation grooves are arranged at intervals in the first direction, and the interval between two adjacent first separation grooves in the first direction ranges from 2 to 4 millimeters; and / or, the length of the first separation groove in the first direction ranges from 0.05 to 1.5 millimeters; and / or, the depth of the first separation groove ranges from 2 to 9 millimeters.

[0015] Optionally, the sum of the areas of the two corner regions accounts for 5% to 20% of the area of the magnetic surface.

[0016] Optionally, the intermediate region is provided with a second separation groove, and the second separation groove is arranged at the middle of the intermediate region; or,

[0017] The intermediate region is provided with a plurality of second separation grooves, and the plurality of second separation grooves are arranged at intervals in the first direction, and the density of the second separation grooves of the intermediate region is less than the density of the first separation grooves of the corner regions.

[0018] Optionally, the interval between two adjacent second separation grooves in the first direction ranges from 4 to 30 millimeters.

[0019] And / or,

[0020] The length of the second separation groove in the first direction ranges from 0.05 to 1.5 millimeters; and the depth of the second separation groove ranges from 2 to 9 millimeters.

[0021] Optionally, the sum of the groove areas of all the first separation grooves on the magnetic surface is a first area, the sum of the groove areas of all the second separation grooves on the magnetic surface is a second area, and the sum of the first area and the second area accounts for 1% to 10% of the area of the magnetic surface.

[0022] Optionally, the first separation groove and / or the second separation groove is filled with an enhanced diffusion structure; or the first separation groove and / or the second separation groove is filled with an insulating structure.

[0023] The motor comprises the magnet as described above.

[0024] The utility model discloses beneficial effect:

[0025] The magnet provided by the utility model, the magnetic surface of the magnet has two corner areas, and the two corner areas are arranged close to the two end faces of the magnet in the first direction, each corner area is provided with a first separation groove, because the magnetic eddy current density in the alternating magnetic field is more concentratedly distributed at the edge of the length direction of the magnet, the magnetic eddy current density at the edge of the length direction of the magnet is maximum, and the working temperature rise amplitude of the edge of the magnet is larger than that of the middle part, the first separation groove is arranged close to the edge of the length direction of the magnet, so that the magnetic eddy current density at the edge of the magnet can be reduced, the proportion of eddy current loss can be reduced, the magnetic loss is significantly reduced, the energy consumption of the motor using the magnet is reduced, and the working temperature rise of the edge of the magnet is reduced by reducing the magnetic eddy current density of the edge of the magnet, the heating of the magnet is slowed down, the situation that the temperature of the magnet exceeds the working temperature is avoided, the risk of demagnetization of the magnet is reduced, and the reliability of the magnet is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings by those skilled in the art without creating labor.

[0027] Figure 1 It is a structural schematic diagram of the magnet provided by the embodiments of the utility model;

[0028] Figure 2 It is a top view of the magnet provided by the embodiments of the utility model;

[0029] Figure 3 It is a front view of the magnet provided by the embodiments of the utility model;

[0030] Figure 4 It is the A place enlarged view shown in the embodiments of the utility model Figure 3

[0031] Figure 5 It is a side view of the magnet provided by the embodiments of the utility model;

[0032] Figure 6 It is a structural schematic diagram of another magnet provided by the embodiments of the utility model;

[0033] Figure 7 ​is a front view of another magnet provided by the embodiment of the utility model;

[0034] Figure 8 is a side view of another magnet provided by the embodiment of the utility model.

[0035] In the figure,

[0036] 100, magnet; 110, magnetic surface; 111, corner area; 112, middle area;

[0037] 120, first separation groove; 130, magnetic part; 131, edge magnetic part; 132, middle magnetic part; 140, insulating adhesive layer; 150, second separation groove;

[0038] X, second direction; Y, first direction; Z, third direction. DETAILED DESCRIPTION

[0039] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further explained below by combining with the drawings and through specific embodiments. It can be understood that the specific embodiments described here are only used for explaining the utility model, and not limiting the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all.

[0040] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0041] In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0042] In the utility model, unless otherwise expressly provided and limited, the first feature is "on" or "under" the second feature, which can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on the surface of" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. In the description of the embodiment, if not specially stated, "a plurality of" specifically refers to two or more than two.

[0043] In the description of the embodiment, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and other orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be a middle element.

[0045] The technical scheme of the utility model will be further illustrated below by combining the drawings and through specific embodiments.

[0046] In the first aspect, the embodiment provides a magnet, which can reduce the generation of induced eddy current, thereby reducing the risk of loss of magnetism due to excessive temperature of the magnet, and has high reliability.

[0047] The magnet in the embodiment can be a neodymium iron boron magnet, which has a large magnetic energy product and can provide a large magnetic field with the same volume. Of course, it can be understood that the magnet can also be a magnet made of other materials, and the embodiment does not limit this.

[0048] Exemplarily, as Figures 1 to 5As shown, the magnet 100 provided in this embodiment has a magnetic surface 110 perpendicular to the magnetic field orientation direction. Magnetic field orientation refers to the process in which, during the production of magnetic materials, an external magnetic field is applied to align the magnetic domains within the material along a specific direction. This process is crucial for improving the magnetic properties of the material because the magnetic properties of the magnet 100 are highest in the magnetic field orientation direction. The magnet 100 may have one or two magnetic surfaces 110. Figure 1 As shown, when the magnet 100 has two magnetic surfaces 110, the two magnetic surfaces 110 are arranged opposite each other in a direction perpendicular to the magnetic field orientation.

[0049] The magnet 100 can have various shapes. For example, in this embodiment, the magnet 100 is rectangular. For ease of explanation, in this embodiment, the length direction of the magnet 100 is referred to as the first direction Y, the width direction of the magnet 100 is referred to as the second direction X, and the thickness direction of the magnet 100 is referred to as the third direction Z. Any two of the first direction Y, the second direction X, and the third direction Z are perpendicular to each other. The two magnetic surfaces 110 are arranged opposite each other in the second direction X. It is understood that the magnet 100 can also be square, cylindrical, etc., and this embodiment does not limit this.

[0050] like Figure 3 As shown, the magnetic surface 110 is divided into a central region 112 and two corner regions 111. The two corner regions 111 are located on both sides of the central region 112 in the first direction Y, that is, the corner regions 111 include the ends of the magnetic surface 110. Each corner region 111 is provided with at least one first dividing groove 120, so that both ends of the magnet 100 in the first direction Y have at least one first dividing groove 120, thereby reducing the generation of magnetic eddy currents.

[0051] It should be noted that the first dividing groove 120 is disposed on the magnetic surface 110 and extends into the interior of the magnet 100. In this embodiment, the depth direction of the first dividing groove 120 is the second direction X. The shape of the first dividing groove 120 can be a straight line, a curve, or other irregular shape; this embodiment does not limit this. For example, as shown... Figure 1 and Figure 3 As shown, the first dividing groove 120 is straight, and the first dividing groove 120 can extend to both surfaces of the magnet 100 in the third direction Z, which facilitates the processing and manufacturing of the first dividing groove 120.

[0052] It should be noted that the first dividing groove 120 in this embodiment is a non-through groove, that is, the depth of the first dividing groove 120 is less than the length of the magnet 100 in the second direction X.

[0053] The magnet 100 provided by the embodiment has two corner regions 111 on the magnetic surface 110 of the magnet 100, and the two corner regions 111 are arranged close to two end surfaces of the magnet 100 in the first direction Y. Each corner region 111 is provided with a first separation groove 120. Since the magnetic eddy current density in the alternating magnetic field is more concentratedly distributed at the edges in the length direction of the magnet 100, the magnetic eddy current density at the edges in the length direction of the magnet 100 is the largest, and the working temperature rise at the edges of the magnet 100 is larger than that at the middle part, and the working temperature at the edges of the magnet 100 is more likely to exceed the working temperature. The first separation groove 120 in the embodiment is arranged close to the edges in the length direction of the magnet 100, so that the magnetic eddy current density at the edges of the magnet 100 can be reduced, so that the proportion of eddy current loss can be reduced, the magnetic loss can be significantly reduced, the energy consumption of the motor using the magnet 100 is reduced, and the working temperature rise at the edges of the magnet 100 is reduced, the heating of the magnet 100 is slowed down, the situation that the temperature of the magnet 100 exceeds the working temperature is avoided, the problem of demagnetization of the magnet 100 is prevented, and the reliability of the magnet 100 is improved.

[0054] In some optional embodiments, the magnet 100 in the embodiment can be a whole piece of magnetic material.

[0055] In another set of optional embodiments, as shown in Figure 2 The magnet 100 includes a plurality of magnetic parts 130 arranged in sequence in the second direction X. The magnet 100 further includes an insulating adhesive layer 140, and two adjacent magnetic parts 130 in the second direction X are bonded by the insulating adhesive layer 140. In this way, compared with the whole piece of magnet 100, the magnetic eddy current loss can be further reduced; and the insulating adhesive layer 140 will not affect the effective magnetic flux of the magnet 100. In addition, the magnet 100 is assembled by the plurality of magnetic parts 130, and the size of the magnet 100 is related to the number of the magnetic parts 130, so that the magnet 100 with different sizes can be assembled, the flexibility is higher, and the production cost of the magnet 100 can be significantly reduced.

[0056] Optionally, at least one of the plurality of magnetic portions 130 has a magnetic surface 110, that is, at least one of the plurality of magnetic portions 130 is provided with the first separation groove 120. By providing the first separation groove 120 in the magnetic portion 130, on the one hand, the processing and manufacturing of the first separation groove 120 are facilitated, and since the size of the magnetic portion 130 is smaller than the size of the entire magnet 100, that is, the magnetic portion 130 can be thinner, the influence of the internal stress of the magnetic portion 130 during the processing of the first separation groove 120 is smaller, thereby reducing the influence on the internal stress of the entire magnet 100, ensuring that the magnet 100 has higher mechanical strength and bending strength. Moreover, the magnet 100 is divided into a plurality of magnetic portions 130, so that there can be magnetic portions 130 in the plurality of magnetic portions 130 that do not have the first separation groove 120, and the magnetic portion 130 that does not have the separation groove has higher mechanical strength, thereby being able to increase the mechanical strength of the entire magnet 100; and the composition of the magnet 100 can be more flexible and suitable for various application scenarios.

[0057] It should be noted that in the second direction X, the first separation groove 120 does not penetrate the magnetic portion 130, so as not to affect the mechanical strength of the magnetic portion 130.

[0058] Exemplarily, the thickness of the insulating adhesive layer 140 ranges from 50 μm to 150 μm. If the thickness of the insulating adhesive layer 140 is too large, the overall thickness of the magnet 100 will be increased, which is not conducive to the miniaturization of the magnet 100; and if the thickness of the insulating adhesive layer 140 is too small, the strength of the connection between the magnetic portions 130 will be affected and the current conduction between adjacent magnetic portions 130 will be caused. For example, the thickness of the insulating adhesive layer 140 is 50 μm, 60 μm, 80 μm, 100 μm, 120 μm, 150 μm, etc.

[0059] In some optional embodiments, the insulating adhesive layer 140 comprises a resin structure and solid particles embedded in the resin structure. The composition of the resin structure is thermosetting resin, for example, the resin structure comprises at least one of epoxy resin, phenolic resin and polyimide resin. The shape of the solid particles is spherical or irregular. The arrangement of the solid particles can make the insulating adhesive layer 140 have a certain shape, that is, improve the plasticity of the insulating adhesive layer 140 to have supporting ability. Exemplarily, the average diameter of the solid particles ranges from 10 μm to 18 μm. For example, the average diameter of the solid particles is 10 μm, 14 μm, 16 μm, 18 μm. It should be noted that the average diameter of the solid particles refers to the average diameter of a plurality of solid particles. For example, the average diameter of the solid particles can be obtained by dividing the sum of the diameters of a plurality of solid particles by the number of the solid particles, which is not limited in the present embodiment.

[0060] In some optional embodiments, as shown in FIG. 6, the magnet 100 comprises a plurality of magnetic portions 130, and the plurality of magnetic portions 130 are connected by the insulating adhesive layer 140. The plurality of magnetic portions 130 are arranged in the first direction Y and the second direction X. Figure 2As shown, the plurality of magnetic portions 130 includes two edge magnetic portions 131 and at least one intermediate magnetic portion 132 disposed between the two edge magnetic portions 131. In the embodiment, the intermediate magnetic portion 132 has one of the following two structures. Figure 2 is a schematic view of the case where the intermediate magnetic portion 132 has one of the following two structures. In the case, the two surfaces of the two edge magnetic portions 131 disposed opposite to each other are both magnetic surfaces 110, that is, the edge magnetic portion 131 in the embodiment is provided with the first separation groove 120.

[0061] The intermediate magnetic portion 132 can have one of the following two structures according to requirements, which are as follows.

[0062] The first structure of the intermediate magnetic portion 132 is that the intermediate magnetic portion 132 has a magnetic surface 110, that is, the intermediate magnetic portion 132 is also provided with the first separation groove 120, so as to further reduce the magnetic eddy current loss and further reduce the eddy current magnetic loss. When the intermediate magnetic portion 132 has one magnetic surface 110, the structure of the intermediate magnetic portion 132 is the same as that of the edge magnetic portion 131, so as to facilitate the batch production of the magnetic portion 130 and improve the production efficiency and assembly efficiency.

[0063] The second structure of the intermediate magnetic portion 132 is that the intermediate magnetic portion 132 does not have a magnetic surface 110, that is, the magnetic surfaces 110 of the magnet 100 are all located in the edge magnetic portion 131. In this way, the intermediate magnetic portion 132 can have a relatively strong structural strength, and the intermediate magnetic portion 132 does not need to be slotted, thereby reducing the manufacturing steps of the magnet 100 and reducing the production cost of the magnet 100.

[0064] It should be noted that the magnet 100 includes the first intermediate magnetic portion 132 and / or the second intermediate magnetic portion 132, and the edge magnetic portion 131, the first intermediate magnetic portion 132 and the second intermediate magnetic portion 132 are combined in any manner to obtain the required magnet 100.

[0065] In order to further take into account the reduction of the eddy current effect and the mechanical strength of the magnet 100, as shown in Figure 3 and Figure 4 Each corner region 111 is provided with a plurality of first separation grooves 120, and the plurality of first separation grooves 120 are spaced apart along the first direction Y. The spacing between two adjacent first separation grooves 120 in the first direction Y is a, wherein the value of a is in the range of 2mm-4mm. The spacing between two adjacent first separation grooves 120 in the first direction Y cannot be too large, otherwise the resistivity of the magnet 100 itself will be low, which will affect the effect of reducing the magnetic eddy current density and further affect the effect of reducing the magnetic eddy current loss. The spacing between two adjacent first separation grooves 120 in the first direction Y cannot be too small, otherwise the internal stress of the magnet 100 will be increased, which will affect the mechanical strength of the magnet 100. For example, the spacing a between two adjacent first separation grooves 120 in the first direction Y is 2mm, 3mm or 4mm.

[0066] In some optional embodiments, as shown in Figure 4 The length of the first separation groove 120 in the first direction Y is L, where L ranges from 0.05 mm to 1.5 mm, that is, the width of the first separation groove 120 ranges from 0.05 mm to 1.5 mm. The width of the first separation groove 120 cannot be too large, which can reduce the eddy current loss of the magnet 100, but will affect the effective magnetic flux of the magnet 100; the width of the first separation groove 120 cannot be too small, which will cause the first separation groove 120 to be blocked due to low processing quality or debris generated during processing, resulting in current breakdown and eddy current conduction problems. For example, the width of the first separation groove 120 is 0.05 mm, 0.1 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, etc.

[0067] In the embodiment, as shown in Figure 5 The depth of the first separation groove 120 is D, where D ranges from 2 mm to 9 mm. The depth of the first separation groove 120 cannot be too large, which will affect the mechanical strength of the magnet 100 and affect the discharge of debris during processing, causing the first separation groove 120 to be blocked; the depth of the first separation groove 120 cannot be too small, which will not achieve the effect of reducing the eddy current density and reducing the eddy current loss. For example, the depth of the first separation groove 120 is 2 mm, 4 mm, 6 mm, 8 mm, 9 mm.

[0068] Optionally, in the embodiment, the sum of the areas of the two corner regions 111 accounts for 5%-20% of the area of the magnetic surface 110. When the magnet 100 is of an equal cross-section structure, the sum of the areas of the two corner regions 111 is the sum of the areas of the portions where the two corner regions 111 are located. At this time, the sum of the areas of the portions where the two corner regions 111 are located accounts for 5%-20% of the area of the magnet 100. The proportion of the areas of the two corner regions 111 in the area of the magnetic surface 110 cannot be too large, which will affect the mechanical strength of the magnet 100; the proportion of the areas of the two corner regions 111 in the area of the magnetic surface 110 cannot be too small, which will not achieve the effect of reducing the eddy current density and reducing the eddy current loss. For example, the proportion of the areas of the two corner regions 111 in the area of the magnetic surface 110 is 5%, 10%, 15%, 20%, etc.

[0069] In some optional embodiments, as shown in Figures 6 to 8 The intermediate region 112 is provided with a second separation groove 150 for reducing the eddy current density in the middle part of the magnet 100, thereby avoiding the problem of excessive temperature rise in the middle part of the magnet 100. The number of the second separation groove 150 in the intermediate region 112 can be one or more.

[0070] When the intermediate region 112 is provided with one second separation groove 150, the one second separation groove 150 is arranged at the middle of the intermediate region 112, specifically, the second separation groove 150 is located at the middle of the intermediate region 112 in the first direction Y, so that the second separation groove 150 is far away from the first separation groove 120 in the two side corner regions 111, so as to minimize the influence on the mechanical strength of the magnet 100.

[0071] When the intermediate region 112 is provided with a plurality of second separation grooves 150, as shown in Figure 7 , the plurality of second separation grooves 150 are arranged at intervals along the first direction Y, and the density of the second separation grooves 150 of the intermediate region 112 is less than the density of the first separation grooves 120 of the corner region 111, that is, the pitch of the second separation grooves 150 in the intermediate region 112 is greater than the pitch of the first separation grooves 120 in the corner region 111. In this way, the second separation grooves 150 of the intermediate region 112 are relatively sparse, which reduces the influence on the mechanical strength of the magnet 100 on the basis of reducing the eddy current loss in the middle of the magnet 100 and ensuring the effective magnetic flux of the magnet 100, so that the magnet 100 has higher mechanical strength.

[0072] It should be noted that in the second direction X, the second separation groove 150 does not penetrate the magnet or the magnetic part 130, so as not to affect the mechanical strength of the magnet and the magnetic part 130. In the third direction Z, the second separation groove 150 penetrates the magnet or the magnetic part 130, so as to facilitate the processing and manufacturing of the second separation groove 150.

[0073] In some optional embodiments, the plurality of second separation grooves 150 can be equally spaced in the first direction Y, as shown in Figure 7 , the pitch of the two adjacent second separation grooves 150 in the first direction Y is b, wherein b is in the range of 4mm-30mm. Preferably, b is in the range of 5mm-20mm. The pitch of the two adjacent second separation grooves 150 in the first direction Y cannot be too small, otherwise it will increase the internal stress of the magnet 100, reduce the mechanical properties of the magnet 100 itself, cause the magnet 100 to be more easily damaged, and have a shorter service life. For example, the pitch of the two adjacent second separation grooves 150 in the first direction Y is 4mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, etc.

[0074] Of course, it can be understood that the plurality of second separation grooves 150 can also be non-equally spaced in the first direction Y, which is not limited in the present embodiment. Moreover, the pitch of the two adjacent second separation grooves 150 in the first direction Y can be determined according to actual conditions, which is also not limited in the present embodiment.

[0075] Exemplarily, the length of the second separation groove 150 in the first direction Y ranges from 0.05 mm to 1.5 mm. The width of the second separation groove 150 cannot be too large, which can reduce the eddy current loss of the magnet 100, but will affect the effective magnetic flux of the magnet 100; the width of the second separation groove 150 cannot be too small, which will cause the second separation groove 150 to be blocked due to low processing quality or debris generated during processing, resulting in current breakdown and eddy current conduction problems. For example, the width of the second separation groove 150 is 0.05 mm, 0.1 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, etc.

[0076] Optionally, the depth of the second separation groove 150 ranges from 2 mm to 9 mm. The depth of the second separation groove 150 cannot be too large, which will affect the mechanical strength of the magnet 100 and affect the discharge of debris during processing, causing the second separation groove 150 to be blocked; the depth of the second separation groove 150 cannot be too small, which cannot reduce the eddy current density and reduce the eddy current loss. For example, the depth of the second separation groove 150 is 2 mm, 4 mm, 6 mm, 8 mm, 9 mm.

[0077] In order to ensure that the separation grooves opened on the magnetic surface 110 can effectively reduce the eddy current effect and reduce the eddy current magnetic loss, in the embodiment, the sum of the opening areas of all the first separation grooves 120 on the magnetic surface 110 is a first area, the sum of the opening areas of all the second separation grooves 150 on the magnetic surface 110 is a second area, and the sum of the first area and the second area accounts for 1% to 10% of the area of the magnetic surface 110, preferably, the sum of the first area and the second area accounts for 1% to 5% of the area of the magnetic surface 110. In this way, the eddy current effect can be reduced and the eddy current magnetic loss can be reduced, and the magnet 100 can also have high mechanical strength.

[0078] In order to improve the surface diffusion capacity of the magnet 100, in some optional embodiments, the first separation groove 120 and / or the second separation groove 150 is filled with a diffusion-enhancing structure (not shown in the figure). The diffusion-enhancing structure can improve the diffusion capacity of the magnet 100. For example, the diffusion-enhancing structure can be a heavy rare earth diffusion source, which can be a powder or slurry containing heavy rare earth elements (such as terbium Tb, dysprosium Dy, etc.). The concentration of heavy rare earth in the first separation groove 120 and the second separation groove 150 is much higher than that in the inside of the magnet 100. Compared with the conventional surface diffusion of the magnet 100, the diffusion mode realized by using the structure in the embodiment can save the amount of heavy rare earth used and reduce the cost of the magnet 100.

[0079] In order to improve the insulation performance of the magnet 100, in some optional embodiments, the first separation groove 120 and / or the second separation groove 150 is filled with an insulation structure (not shown in the figure). In this way, the insulation performance of the local magnet 100 can be improved, and the insulation performance of the entire magnet 100 can be improved, and the local eddy current loss of the magnet 100 can be optionally reduced. Exemplarily, the insulation structure can be an insulation adhesive.

[0080] The magnet 100 provided in the embodiment is subjected to magnetic flux ratio calculation, magnetic loss ratio test and bending strength test. Specifically, Figure 1 The magnetic loss ratio of the magnet 100 shown is less than 10%, the magnetic flux ratio is higher than 97%, and the bending strength is greater than 15KN / mm 2 It can be seen that the magnet 100 in the embodiment can significantly reduce the eddy current effect, that is, the eddy current loss ratio is significantly reduced, and at the same time, the magnetic loss can also be significantly reduced; in terms of mechanical properties, the magnet 100 provided in the embodiment has high bending strength.

[0081] The calculation method of the magnetic flux ratio is that the magnetic flux meter is used to measure the magnet 100 assembled by the magnetic part provided with the first separation groove and the magnet 100 assembled by the magnetic sheet without the separation groove, and the magnetic flux ratio is the magnetic flux of the magnet 100 assembled by the magnetic part provided with the first separation groove / the magnetic flux of the magnet 100 assembled by the magnetic sheet without the separation groove. The calculation method of the magnetic loss is that the magnet 100 is placed in a 100℃ oven for 1.5 hours, then taken out and placed, and cooled to room temperature, the magnetic flux of the magnet 100 is tested, and compared with the magnetic flux before baking, the magnetic loss is (the magnetic flux before baking-the magnetic flux after baking) / the magnetic flux before baking. The test method of the bending strength is that the universal electronic tester is used, and the 3-point bending test method is adopted to detect the magnet 100, and the bending strength of the magnet 100 is obtained.

[0082] In a second aspect, the embodiment also provides an electric machine comprising the magnet 100 as described above. The electric machine provided in the embodiment has higher working efficiency and lower energy consumption.

[0083] The electric machine provided in the embodiment can be applied in the fields of new energy vehicles, wind power, energy-saving electric machines and the like.

[0084] It should be noted that the above only the preferred embodiments of the present application and the use of technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, those skilled in the art can make various obvious changes, re-adjustment and replacement without departing from the scope of the present application. Therefore, although the above embodiments of the present application has been described in more detail, but the present application is not limited to the above examples, without departing from the concept of the present application, but also can include more other equivalent embodiments, and the scope of the present application is determined by the appended claims.

Claims

1. A magnet, characterized in that, The magnet has a magnetic surface (110) perpendicular to the magnetic field orientation direction. The magnetic surface (110) is divided into a central region (112) and two corner regions (111). The two corner regions (111) are located on both sides of the central region (112) in a first direction (Y). Each corner region (111) is provided with at least one first dividing groove (120). The first direction (Y) is the length direction of the magnet.

2. The magnet according to claim 1, characterized in that, The magnet includes an insulating adhesive layer (140) and a plurality of magnetic parts (130), the plurality of magnetic parts (130) being arranged sequentially along a second direction (X), and two adjacent magnetic parts (130) in the second direction (X) being bonded together by the insulating adhesive layer (140); at least one of the magnetic parts (130) has the magnetic surface (110); wherein, the second direction (X) is perpendicular to the first direction (Y).

3. The magnet according to claim 2, characterized in that, The thickness of the insulating adhesive layer (140) ranges from 50 μm to 150 μm; And / or, The insulating adhesive layer (140) includes a resin structure and solid particles embedded in the resin structure, wherein the average diameter of the solid particles ranges from 10 μm to 18 μm.

4. The magnet according to claim 2, characterized in that, The plurality of magnetic parts (130) include two edge magnetic parts (131) and at least one intermediate magnetic part (132) disposed between the two edge magnetic parts (131), and the two surfaces of the two edge magnetic parts (131) disposed opposite to each other are both magnetic surfaces (110); The intermediate magnetic part (132) has the magnetic surface (110); or, the magnetic surfaces (110) of the magnet are all located in the edge magnetic part (131).

5. The magnet according to claim 1, characterized in that, Each of the corner regions (111) is provided with a plurality of first partition grooves (120), the plurality of first partition grooves (120) are spaced apart along the first direction (Y), the spacing between two adjacent first partition grooves (120) in the first direction (Y) is in the range of 2mm-4mm; and / or, the length of the first partition groove (120) in the first direction (Y) is in the range of 0.05mm-1.5mm; and / or, the depth of the first partition groove (120) is in the range of 2mm-9mm.

6. The magnet according to claim 1, characterized in that, The sum of the areas of the two corner regions (111) accounts for 5%-20% of the area of ​​the magnetic surface (110).

7. The magnet according to any one of claims 1-6, characterized in that, The intermediate region (112) is provided with a second dividing groove (150), which is located in the middle of the intermediate region (112); or, The intermediate region (112) is provided with a plurality of second partition grooves (150), which are spaced apart along the first direction (Y). The density of the second partition grooves (150) in the intermediate region (112) is less than the density of the first partition grooves (120) in the corner region (111).

8. The magnet according to claim 7, characterized in that, The spacing between two adjacent second dividing slots (150) in the first direction (Y) ranges from 4mm to 30mm; And / or, The length of the second dividing groove (150) in the first direction (Y) ranges from 0.05mm to 1.5mm; the depth of the second dividing groove (150) ranges from 2mm to 9mm.

9. The magnet according to claim 7, characterized in that, The sum of the slot areas of all the first partition grooves (120) on the magnetic surface (110) is the first area, and the sum of the slot areas of all the second partition grooves (150) on the magnetic surface (110) is the second area. The sum of the first area and the second area accounts for 1%-10% of the area of ​​the magnetic surface (110).

10. The magnet according to claim 7, characterized in that, The first partition groove (120) and / or the second partition groove (150) are filled with an enhanced diffusion structure; or, the first partition groove (120) and / or the second partition groove (150) are filled with an insulating structure.

11. An electric motor, characterized in that, Includes the magnet as described in any one of claims 1-10.

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