Magnet, rotor and motor

Abstract

The utility model provides a magnet, a rotor with the magnet and a motor with the rotor. The magnet comprises a main body, the main body is provided with a first surface and a second surface which are opposite, and a notch formed in at least one of the first surface and the second surface of the main body, the depth direction of the notch is perpendicular to at least one of the first surface and the second surface, and the magnet is in a cuboid shape. And the notch does not penetrate through the main body in the depth direction of the notch or penetrates through the main body in the depth direction of the notch. By adopting the technical scheme of the utility model, the stress concentration points of the magnet can be increased, the stress of the magnet can be dispersed, and the physical performance of the magnet can be improved while the magnetic loss of the magnet is reduced and the eddy-current loss of the magnet is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a magnet, a rotor and a motor. Background Art

[0002] Magnets have been widely used in various types of high-efficiency and energy-saving motors due to their high magnetic energy product and high coercive force.

[0003] Because magnets are good conductors and are usually large in size when used in motors, they are prone to generate strong eddy currents in high-frequency alternating magnetic fields, causing the magnets to heat up. This can easily cause reversible or irreversible magnetic losses in the magnets, increase motor energy consumption, and reduce efficiency.

[0004] In order to reduce the eddy current loss of magnets, small magnets are usually glued together into a large magnet with insulating glue, or conventional slots are opened on the magnets. However, both methods will increase the stress inside the magnets, thereby deteriorating the physical properties of the magnets, especially the bending strength. Therefore, it is urgent to improve the existing magnets. Summary of the invention

[0005] In order to overcome at least one aspect of the above-mentioned defects and problems in the prior art, the utility model provides a magnet.

[0006] According to a specific embodiment of the utility model, a magnet is provided, comprising: a main body having a first surface and a second surface opposite to each other; and a notch formed in at least one of the first surface and the second surface of the main body.

[0007] In a preferred embodiment, the depth direction of the notch is perpendicular to at least one of the first surface and the second surface.

[0008] In a preferred embodiment, the magnet is in the shape of a cuboid.

[0009] In a preferred embodiment, the notch does not penetrate through the body in the depth direction of the notch.

[0010] In a preferred embodiment the notch penetrates the body in the depth direction of the notch.

[0011] In a preferred embodiment, the slots include a first slot, a second slot, a third slot, and a fourth slot. The first slot and the second slot are both opened on the first surface and are respectively located on both sides of the first surface in the width direction of the magnet. The third slot and the fourth slot are both opened on the second surface and are respectively located on both sides of the second surface in the width direction of the magnet.

[0012] In a preferred embodiment, the first notch and the second notch are symmetrically arranged side by side along the length direction of the magnet.

[0013] In a preferred embodiment, a first notch and a second notch form a first notch group, and the magnet is provided with three or more first notch groups along its length direction, and the distance between any two adjacent first notch groups is the same.

[0014] In a preferred embodiment, the third slot and the fourth slot are symmetrically arranged side by side along the length direction of the magnet.

[0015] In a preferred embodiment, a third notch and a fourth notch form a second notch group, and the magnet is provided with three or more second notch groups along its length direction, and the distance between any two adjacent second notch groups is the same.

[0016] In a preferred embodiment, one end of the first slot, the second slot, the third slot, and the fourth slot all extend to the long side of the magnet, so that the slot ends are connected to the outside.

[0017] In a preferred embodiment, the plane where the half position of the magnet height direction is located is taken as the symmetry plane, the first notch is symmetrical with the third notch, and the second notch is symmetrical with the fourth notch.

[0018] In a preferred embodiment, the notches include a fifth notch and a sixth notch, and the fifth notch and the sixth notch are symmetrically arranged side by side along the length direction of the magnet and are respectively arranged on both sides of the main body in the width direction of the magnet.

[0019] In a preferred embodiment, a fifth notch and a sixth notch form a third notch group, and the magnet is provided with three or more third notch groups along its length direction, and the distance between any two adjacent third notch groups is the same.

[0020] In a preferred embodiment, the slots include a seventh slot and an eighth slot, the seventh slot and the eighth slot are respectively close to two sides of the main body in the width direction of the magnet, and the seventh slot and the eighth slot are alternately arranged along the length direction of the magnet.

[0021] In a preferred embodiment, a seventh slot and an eighth slot form a fourth slot group, and the magnet is provided with three or more fourth slot groups along its length direction, and the distance between any two adjacent fourth slot groups is the same.

[0022] In a preferred embodiment, the slots include a ninth slot and a tenth slot, the ninth slot is opened on the first surface, the tenth slot is opened on the second surface, both ends of the ninth slot and the tenth slot extend to the long side of the magnet, so that the slot ends are connected to the outside.

[0023] In a preferred embodiment, the distances between adjacent ninth notches are the same, and the distances between adjacent tenth notches are the same.

[0024] In a preferred embodiment, the second surface is used as the projection surface, and the projections of the ninth notch and the tenth notch are parallel to and spaced apart from each other.

[0025] In a preferred embodiment, a ninth slot and a tenth slot form a fifth slot group, the magnet is provided with two or more fifth slot groups along its length direction, and the projection of the ninth slot on the second surface is the same as the distance between the adjacent tenth slots.

[0026] In a preferred embodiment, the slots include an eleventh slot and a twelfth slot, the eleventh slot and the twelfth slot are symmetrically arranged side by side along the length direction of the magnet, the eleventh slot and the twelfth slot are respectively arranged on both sides of the main body in the width direction of the magnet, and one end of the eleventh slot and the twelfth slot are extended to the long side position of the magnet, so that the slot ends are connected to the outside world.

[0027] In a preferred embodiment, an eleventh notch and a twelfth notch form a sixth notch group, and the magnet is provided with three or more sixth notch groups along its length direction, and the distance between any two adjacent sixth notch groups is the same.

[0028] In a preferred embodiment the slots are parallel to the width of the magnet.

[0029] In order to overcome at least one aspect of the above-mentioned defects and problems in the prior art, the utility model provides a rotor, which includes the magnet as described above.

[0030] In order to overcome at least one aspect of the above-mentioned defects and problems in the prior art, the utility model provides a motor, which includes the rotor as described above.

[0031] In summary, the technical solution of the utility model can increase stress concentration points, disperse the stress of the magnet, and improve the physical properties of the magnet while reducing the magnetic loss and eddy current loss of the magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a three-dimensional diagram of the magnet in Example 1 of the present application;

[0033] Figure 2 It is a three-dimensional diagram of the magnet in another direction in Example 1 of the present application;

[0034] Figure 3 This is a schematic diagram of the first surface facing the magnet in Example 1 of the present application;

[0035] Figure 4 It is a three-dimensional diagram of the magnet in Example 2 of the present application;

[0036] Figure 5 This is a schematic diagram of the first surface facing the magnet in Example 2 of the present application;

[0037] Figure 6 is a three-dimensional diagram of the magnet in Example 3 of the present application;

[0038] Figure 7 This is a schematic diagram of the first surface facing the magnet in Example 3 of the present application;

[0039] Figure 8 is a three-dimensional diagram of the magnet in Example 4 of the present application;

[0040] Fig. 9 A three-dimensional diagram of the magnet in Example 4 of the present application from another direction;

[0041] Fig.10 This is a schematic diagram of the first surface facing the magnet in Example 4 of the present application;

[0042] Fig.11 This is a schematic diagram of the second surface facing the magnet in Example 4 of the present application;

[0043] Fig.12 is a three-dimensional diagram of the magnet in Example 5 of the present application;

[0044] Fig.13 This is a schematic diagram of the first surface facing the magnet in Example 5 of the present application;

[0045] Fig.14 It is a three-dimensional diagram of the magnet in comparative example 1 of the present application;

[0046] Fig.15 This is a bottom view of the magnet in comparative example 1 of the present application.

[0047] Explanation of the figure markings: 1. main body 11. first surface; 12. second surface; 2. notch; 21. first notch; 22. second notch; 23. third notch; 24. fourth notch; 25. fifth notch; 26. sixth notch; 27. seventh notch; 28. eighth notch; 29. ​​ninth notch; 30. tenth notch; 31. eleventh notch; 32. twelfth notch; 33. thirteenth notch; 41. first notch group; 42. second notch group; 43. third notch group; 44. fourth notch group; 45. fifth notch group; 46. sixth notch group. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] As shown in the accompanying drawings, the utility model discloses a magnet, which includes a main body 1, the main body 1 having a first surface 11 and a second surface 12 opposite to each other, and a notch 2 formed in at least one of the first surface 11 and the second surface 12 of the main body 1, the depth direction of the notch 2 is perpendicular to at least one of the first surface 11 and the second surface 12, the notch 2 can be filled with a material, the resistivity of the material is greater than the resistivity of the material of the main body 1, the magnet is a rectangular parallelepiped, and the first surface 11 and the second surface 12 are parallel to each other. After the magnet is slotted, the magnetic loss and eddy current loss of the magnet can be reduced, and by filling the notch 2 with a high resistivity material, the resistivity of the magnet can be improved, and at the same time, the physical properties such as low bending resistance caused by the slotting can be compensated.

[0050] Preferably, the slot 2 does not penetrate the main body 1 in the depth direction of the slot 2. The effects of the through slot and the non-through slot in reducing the magnetic loss and eddy current loss are not much different, but in terms of physical properties, the non-through slot has a better effect. Compared with the through slot, the non-through slot has more stress concentration points, which can better disperse the stress caused by the slot and has better physical properties.

[0051] Preferably, the slot 2 passes through the main body 1 in the depth direction of the slot 2, and the slot 2 passes through to the other surface. Compared with non-penetrating slots, the process of penetrating slots is simpler. At the same time, the penetrating slot also has a stress concentration point, which can disperse the stress caused by the slotting and improve the physical properties of the magnet.

[0052] Based on the technical solution of the utility model, several specific embodiments are provided below:

[0053] Embodiment 1: refer to the attached Figure 1 ~Attached Figure 3 .

[0054] Embodiment 1 provides a magnet, which is a rectangular parallelepiped with specific length, width and height of 33.5 mm×22 mm×5.5 mm, including a first surface 11 and a second surface 12, and the two surfaces are parallel to each other.

[0055] Preferably, see Attachment Figure 1 The slot 2 includes a first slot 21 and a second slot 22. The first slot 21 and the second slot 22 are both opened on the first surface 11 and are respectively located on both sides of the first surface 11 in the width direction of the magnet. The first slot 21 and the second slot 22 are both parallel to the width direction of the magnet. The first slot 21 and the second slot 22 are symmetrically arranged side by side along the length direction of the magnet. A first slot 21 and a second slot 22 form a first slot group 41. The magnet is provided with four first slot groups 41 along its length direction. The distance between any two adjacent first slot groups 41 is the same. One end of the first slot 21 and the second slot 22 extends to the long side position of the magnet, so that the end of the slot 2 is connected to the outside world.

[0056] Preferably, see Attachment Figure 2 The slot 2 includes a third slot 23 and a fourth slot 24. The third slot 23 and the fourth slot 24 are both opened on the second surface 12 and are respectively located on both sides of the second surface 12 in the width direction of the magnet. The third slot 23 and the fourth slot 24 are both parallel to the width direction of the magnet. The third slot 23 and the fourth slot 24 are symmetrically arranged side by side along the length direction of the magnet. A third slot 23 and a fourth slot 24 form a group of second slot groups 42. The magnet is provided with four groups of second slot groups 42 along its length direction. The distance between any two adjacent groups of second slot groups 42 is the same. One end of the third slot 23 and the fourth slot 24 extend to the long side position of the magnet, so that the end of the slot 2 is connected to the outside world.

[0057] Preferably, see Attachment Figure 1 ~Attached Figure 2 , taking the plane where the half position of the magnet height direction is located as the symmetry plane, the first slot 21 is symmetrical with the third slot 23, and the second slot 22 is symmetrical with the fourth slot 24.

[0058] Preferably, the depths of the first notch 21 , the second notch 22 , the third notch 23 , and the fourth notch 24 are all less than half the height of the magnet.

[0059] Preferably, the first notch 21 , the second notch 22 , the third notch 23 , and the fourth notch 24 have a length of 8.25 mm, a width of 0.2 mm, and a depth of 2 mm.

[0060] Preferably, see Attachment Figure 3 , the distances between adjacent second notches 22 are the same, and the distances between the second notches 22 on both sides and the two wide sides of the magnet are the same. Further, the second notches 22 are evenly arranged on the long sides of the magnet.

[0061] Preferably, see Attachment Figure 1 ~Attached Figure 3 The arrangement of the first slot 21, the third slot 23, and the fourth slot 24 is the same as that of the second slot 22, which will not be described in detail here.

[0062] The magnet in this embodiment is slotted to reduce the magnetic loss and eddy current loss of the magnet. The slotting position and method are similar to the traditional slotting method in comparative example 1 in reducing the magnetic loss and eddy current loss of the magnet. However, the bending resistance of the traditional slotting method is greatly reduced compared with that of the complete magnet, and cannot adapt to the performance requirements of various working environments. The magnet in this embodiment has a reasonable slotting position, 16 slots with a total of 48 stress concentration points. Experimental results show that the more stress concentration points there are, the more the stress caused by the slotting can be dispersed, the greater the bending strength of the magnet, and the better the physical properties.

[0063] Example 2: Refer to the attached Figure 4 ~Attached Figure 5 .

[0064] Embodiment 2 provides a magnet, which is a rectangular parallelepiped with specific length, width and height of 33.5 mm×22 mm×5.5 mm, including a first surface 11 and a second surface 12, and the two surfaces are parallel to each other.

[0065] Preferably, see Attachment Figure 4 The slots include a fifth slot 25 and a sixth slot 26. The fifth slot 25 and the sixth slot 26 are symmetrically arranged side by side along the length direction of the magnet and are respectively arranged on both sides of the main body 1 in the width direction of the magnet. The fifth slot 25 and the sixth slot 26 are both parallel to the width direction of the magnet. One fifth slot 25 and one sixth slot 26 form a third slot group 43. The magnet is provided with four third slot groups 43 along its length direction, and the distance between any two adjacent third slot groups 43 is the same.

[0066] Preferably, the fifth notch 25 and the sixth notch 26 have a length of 8.25 mm, a width of 0.2 mm, and a depth of 5.5 mm.

[0067] Preferably, see Attachment Figure 5 , the distances between adjacent fifth notches 25 are the same, and the distances between the fifth notches 25 on both sides and the two wide sides of the magnet are the same. Further, the fifth notches 25 are evenly arranged on the long sides of the magnet.

[0068] Preferably, see Attachment Figure 4 ~Attached Figure 5 The arrangement of the sixth slot 26 is the same as that of the fifth slot 25, which will not be described in detail here.

[0069] The magnet in this embodiment is slotted to reduce the magnetic loss and eddy current loss of the magnet. The slotting position and method are similar to the traditional slotting method in comparative example 1 in reducing the magnetic loss and eddy current loss of the magnet. However, the bending resistance of the traditional slotting method is greatly reduced compared with that of the complete magnet, and cannot adapt to the performance requirements of various working environments. The magnet in this embodiment has a reasonable slotting position, and 8 slots have a total of 32 stress concentration points. Experimental results show that the more stress concentration points, the more the stress caused by the slotting can be dispersed, the greater the bending strength of the magnet, and the better the physical properties. Although the physical properties are not as good as those in Example 1, the processing technology is simpler than that in Example 1, and the slotting method in the specific embodiment can be selected according to the specific working environment of the magnet.

[0070] Example 3: Refer to the attached Figure 6 ~Attached Figure 7 .

[0071] Embodiment 3 provides a magnet, which is a rectangular parallelepiped with specific length, width and height of 33.5 mm×22 mm×5.5 mm, including a first surface 11 and a second surface 12, and the two surfaces are parallel to each other.

[0072] Preferably, see Attachment Figure 6 The slot 2 includes a seventh slot 27 and an eighth slot 28. The seventh slot 27 and the eighth slot 28 are respectively close to the two sides of the main body 1 in the width direction of the magnet. The seventh slot 27 and the eighth slot 28 are parallel to the width direction of the magnet, and the seventh slot 27 and the eighth slot 28 are alternately arranged along the length direction of the magnet. One seventh slot 27 and one eighth slot 28 form a fourth slot group 44. The magnet is provided with four fourth slot groups 44 along its length direction, and the distance between any two adjacent fourth slot groups 44 is the same.

[0073] Preferably, the seventh notch 27 and the eighth notch 28 have a length of 14 mm, a width of 0.2 mm, and a depth of 5.5 mm.

[0074] Preferably, see Attachment Figure 7 The distances between adjacent seventh slots 27 are the same, the distances between adjacent eighth slots 28 are the same, and the distances between adjacent seventh slots 27 and eighth slots 28 are the same.

[0075] The magnet in this embodiment is slotted to reduce the magnetic loss and eddy current loss of the magnet. The slotting position and method are similar to the traditional slotting method in comparative example 1 in reducing the magnetic loss and eddy current loss of the magnet. However, the bending resistance of the traditional slotting method is greatly reduced compared with that of the complete magnet, and cannot adapt to the performance requirements of various working environments. The magnet in this embodiment has a reasonable slotting position, and 8 slots have a total of 28 stress concentration points. Experimental results show that the more stress concentration points, the more the stress caused by the slotting can be dispersed, the greater the bending strength of the magnet, and the better the physical properties. Although the physical properties are not as good as those in Examples 1 and 2, the processing technology is simpler than that in Examples 1 and 2, and the slotting method in the specific embodiment can be selected according to the specific working environment of the magnet.

[0076] Embodiment 4: refer to the attached Figure 8 ~Attached Fig.11 .

[0077] Embodiment 4 provides a magnet, which is a rectangular parallelepiped with specific length, width and height of 33.5 mm×22 mm×5.5 mm, including a first surface 11 and a second surface 12, and the two surfaces are parallel to each other.

[0078] Preferably, see Attachment Figure 8 ~Attached Fig. 9The slots include a ninth slot 29 and a tenth slot 30. The ninth slot 29 is provided on the first surface 11, and the tenth slot 30 is provided on the second surface 12. The ninth slot 29 and the tenth slot 30 are parallel to the width direction of the magnet. Both ends of the ninth slot 29 and the tenth slot 30 extend to the long side of the magnet, so that the end of the slot 2 is connected to the outside. The distance between adjacent ninth slots 29 is the same, and the distance between adjacent tenth slots 30 is the same. With the second surface 12 as the projection surface, the projections of the ninth slot 29 and the tenth slot 30 are parallel to each other and spaced apart. One ninth slot 29 and one tenth slot 30 form a fifth slot group 45. The magnet is provided with four fifth slot groups 45 along its length direction. The projection of the ninth slot 29 on the second surface 12 is the same as the distance between the adjacent tenth slots 30.

[0079] Preferably, the ninth notch 29 and the tenth notch 30 have a length of 22 mm, a width of 0.2 mm, and a depth of 3.25 mm.

[0080] The magnet in this embodiment is slotted to reduce the magnetic loss and eddy current loss of the magnet. The slotting position and method are similar to the traditional slotting method in comparative example 1 in reducing the magnetic loss and eddy current loss of the magnet. However, the bending resistance of the traditional slotting method is greatly reduced compared with that of the complete magnet, and cannot adapt to the performance requirements of various working environments. The magnet in this embodiment has a reasonable slotting position, and 8 slots have a total of 16 stress concentration points. Experimental results show that the more stress concentration points, the more the stress caused by the slotting can be dispersed, the greater the bending strength of the magnet, and the better the physical properties. Although not as good as the physical properties in Examples 1, 2, and 3, the slotting method in the specific embodiment can be selected according to the specific working environment of the magnet.

[0081] Example 5: Refer to the attached Fig.12 ~Attached Fig.13 .

[0082] Embodiment 5 provides a magnet, which is a rectangular parallelepiped with specific length, width and height of 33.5 mm×22 mm×5.5 mm, including a first surface 11 and a second surface 12, and the two surfaces are parallel to each other.

[0083] Preferably, see Attachment Fig.12The slot 2 includes an eleventh slot 31 and a twelfth slot 32. The eleventh slot 31 and the twelfth slot 32 are symmetrically arranged side by side along the length direction of the magnet. The eleventh slot 31 and the twelfth slot 32 are parallel to the width direction of the magnet. The eleventh slot 31 and the twelfth slot 32 are respectively arranged on both sides of the main body 1 in the width direction of the magnet. One end of the eleventh slot 31 and the twelfth slot 32 extend to the long side position of the magnet, so that the end of the slot 2 is connected to the outside world. An eleventh slot 31 and a twelfth slot 32 form a group of sixth slot groups 46. The magnet is provided with four groups of sixth slot groups 46 along its length direction, and the distance between any two adjacent groups of sixth slot groups 46 is the same.

[0084] Preferably, the eleventh notch 31 and the twelfth notch 32 have a length of 8.25 mm, a width of 0.2 mm, and a depth of 5.5 mm.

[0085] Preferably, see Attachment Fig.13 , the distances between adjacent twelfth notches 32 are the same, and the distances between the twelfth notches 32 on both sides and the two wide sides of the magnet are the same. Further, the twelfth notches 32 are evenly arranged on the long sides of the magnet.

[0086] Preferably, see Attachment Fig.12 ~Attached Fig.13 The arrangement of the eleventh slot 31 is the same as that of the twelfth slot 32, which will not be described in detail here.

[0087] The magnet in this embodiment is slotted to reduce the magnetic loss and eddy current loss of the magnet. The slotting position and method are similar to those of the traditional slotting method in comparative example 1 in reducing the magnetic loss and eddy current loss of the magnet. However, the bending resistance of the traditional slotting method is greatly reduced compared with that of the complete magnet, and cannot adapt to the performance requirements of various working environments. The magnet in this embodiment has a reasonable slotting position, and 8 slots have a total of 16 stress concentration points. Experimental results show that the more stress concentration points, the more the stress caused by the slotting can be dispersed, the greater the bending strength of the magnet, and the better the physical properties. Although the physical properties are not as good as those in Examples 1, 2, and 3, the processing technology is simpler than that in Examples 1, 2, and 3, and the slotting method in the specific embodiment can be selected according to the specific working environment of the magnet.

[0088] Embodiment 6:

[0089] Embodiment 6 provides a rotor, which includes a magnet as described in any one of Embodiments 1 to 5.

[0090] Embodiment 7:

[0091] Embodiment 7 provides a motor, which includes the rotor as described in Embodiment 6.

[0092] Comparative Example 1: Refer to the attached Fig.14 ~Attached Fig.15 .

[0093] Comparative Example 1 provides a conventional slotted magnet, which is square in shape, with specific length, width and height of 33.5mm×22mm×5.5mm, and has four thirteenth slots 33 evenly opened along the length direction, each with a length of 16.5mm, a slot depth of 5.5mm and a slot width of 0.2mm.

[0094] The parameters and related properties of Examples 1 to 5 and Comparative Example 1 are summarized as follows:

[0095]

[0096] It can be seen from the above table that the magnetic loss and eddy current loss of the magnets in Examples 1 to 5 and Comparative Example 1 are not much different, but the number of stress concentration points varies greatly. The stress concentration points are from least to most in Comparative Example 1, Example 5, Example 4, Example 3, Example 2, and Example 1. As the stress concentration points increase, the bending strength of the magnet also increases. It can be seen that the more stress concentration points the slotted magnet has, the greater the bending strength of the magnet, and thus the better the physical properties of the magnet.

[0097] The difference between the slots in Example 1 and Example 5 is that Example 1 is a non-through slot, and Example 5 is a through slot, and the bending strength of Example 1 is much higher than the bending strength of Example 5. It can be seen that when the slot positions are the same, the non-through slot has more stress concentration points than the through slot, and the magnet has better bending strength, so the physical properties of the magnet are also better.

[0098] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A magnet, comprising: A rectangular parallelepiped body, the body having a length, a width and a height, wherein the height is smaller than the length and the width, the body having a first surface and a second surface opposite to each other extending in the length direction and the width direction and a peripheral surface extending in the height direction; as well as a notch formed in at least one of the first surface and the second surface of the body, The depth direction of the notch is consistent with the height direction of the main body, The notch does not penetrate the body in a depth direction of the notch.

2. The magnet according to claim 1, characterized in that: The slots include a first slot, a second slot, a third slot, and a fourth slot. The first slot and the second slot are both opened on the first surface and are respectively located on both sides of the first surface in the width direction of the magnet. The third slot and the fourth slot are both opened on the second surface and are respectively located on both sides of the second surface in the width direction of the magnet.

3. The magnet according to claim 2, characterized in that: The first notch and the second notch are symmetrically arranged side by side along the length direction of the magnet.

4. The magnet according to claim 3, characterized in that: A first notch and a second notch form a first notch group. The magnet is provided with three or more first notch groups along its length direction. The distances between any two adjacent first notch groups are the same.

5. The magnet according to claim 2, characterized in that: The third slot and the fourth slot are symmetrically arranged side by side along the length direction of the magnet.

6. The magnet according to claim 5, characterized in that: A third notch and a fourth notch form a second notch group. The magnet is provided with three or more second notch groups along its length direction. The distances between any two adjacent second notch groups are the same.

7. The magnet according to claim 2, characterized in that: One end of the first slot, the second slot, the third slot and the fourth slot all extend to the long side of the magnet, so that the slot ends are connected to the outside.

8. The magnet according to claim 7, characterized in that: Taking the plane where the half position in the height direction of the magnet is located as the symmetry plane, the first notch is symmetrical to the third notch, and the second notch is symmetrical to the fourth notch.

9. The magnet according to claim 1, characterized in that: The slots include a ninth slot and a tenth slot, wherein the ninth slot is opened on the first surface, and the tenth slot is opened on the second surface, and both ends of the ninth slot and the tenth slot extend to the long side of the magnet, so that the slot ends are connected to the outside.

10. The magnet according to claim 9, characterized in that: The distances between adjacent ninth notches are the same, and the distances between adjacent tenth notches are the same.

11. The magnet according to claim 10, characterized in that: Taking the second surface as the projection surface, the projections of the ninth notch and the tenth notch are parallel to and spaced apart from each other.

12. The magnet according to claim 11, characterized in that: A ninth slot and a tenth slot form a fifth slot group, and the magnet is provided with two or more fifth slot groups along its length direction. The projection of the ninth slot on the second surface is the same as the distance between the adjacent tenth slots.

13. The magnet according to any one of claims 1 to 12, characterized in that: The slot is parallel to the width direction of the magnet.

14. A magnet, comprising: A rectangular parallelepiped body, the body having a length, a width and a height, wherein the height is smaller than the length and the width, the body having a first surface and a second surface opposite to each other extending in the length direction and the width direction and a peripheral surface extending in the height direction; as well as a notch formed in at least one of the first surface and the second surface of the body, wherein the depth direction of the notch coincides with the height direction of the body, The notch penetrates the body in the depth direction of the notch, The slots include a fifth slot and a sixth slot, the fifth slot and the sixth slot are symmetrically arranged side by side along the length direction of the magnet and are respectively arranged on both sides of the main body in the width direction of the magnet; and the fifth slot and the sixth slot are both located inside the main body and do not extend to the surrounding surface of the main body.

15. The magnet according to claim 14, characterized in that: A fifth notch and a sixth notch form a third notch group. The magnet is provided with three or more third notch groups along its length direction. The distances between any two adjacent third notch groups are the same.

16. The magnet according to claim 14 or 15, characterized in that: The slot is parallel to the width direction of the magnet.

17. A magnet comprising: A rectangular parallelepiped body, the body having a length, a width and a height, wherein the height is smaller than the length and the width, the body having a first surface and a second surface opposite to each other extending in the length direction and the width direction and a peripheral surface extending in the height direction; as well as a notch formed in at least one of the first surface and the second surface of the body, wherein the depth direction of the notch coincides with the height direction of the body, The notch penetrates the body in the depth direction of the notch, The slots include a seventh slot and an eighth slot, the seventh slot and the eighth slot are respectively close to both sides of the main body in the width direction of the magnet, and the seventh slot and the eighth slot are alternately arranged along the length direction of the magnet; and the seventh slot and the eighth slot are both located inside the main body and do not extend to the surrounding surface of the main body.

18. The magnet according to claim 17, characterized in that: A seventh slot and an eighth slot form a fourth slot group. The magnet is provided with three or more fourth slot groups along its length direction. The distances between any two adjacent fourth slot groups are the same.

19. The magnet according to claim 17 or 18, characterized in that: The slot is parallel to the width direction of the magnet.

20. A magnet comprising: A rectangular parallelepiped body, the body having a length, a width and a height, wherein the height is smaller than the length and the width, the body having a first surface and a second surface opposite to each other extending in the length direction and the width direction and a peripheral surface extending in the height direction; as well as a notch formed in at least one of the first surface and the second surface of the body, wherein the depth direction of the notch coincides with the height direction of the body, The notch penetrates the body in the depth direction of the notch, The slots include an eleventh slot and a twelfth slot, the eleventh slot and the twelfth slot are symmetrically arranged side by side along the length direction of the magnet, the eleventh slot and the twelfth slot are respectively arranged on both sides of the main body in the width direction of the magnet, and one end of the eleventh slot and the twelfth slot are extended to the long side position of the magnet, so that the slot ends are connected to the outside world.

21. The magnet according to claim 20, characterized in that: An eleventh notch and a twelfth notch form a sixth notch group. The magnet is provided with three or more sixth notch groups along its length direction, and the distances between any two adjacent sixth notch groups are the same.

22. The magnet according to claim 20 or 21, characterized in that: The slot is parallel to the width direction of the magnet.

23. A rotor for an electric motor, comprising: A magnet according to any one of claims 1 to 22.

24. A motor, comprising: A rotor according to claim 23.

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