Stator assembly and motor

Abstract

The embodiment of the utility model provides a stator assembly and a motor, and the stator assembly comprises a stator iron core which is provided with a plurality of grooves penetrating along the axial direction; at least a part of the stator coil is accommodated in the slot; the stator includes a stator core, a stator coil disposed in the stator core, and a piece of insulation paper disposed in the slot and located between the stator core and the stator coil, in which the insulation paper includes a first side portion facing a bottom surface of the slot, and the first side portion is formed with a protrusion protruding toward the bottom surface and extending in an axial direction. The insulation paper is provided with a first side part opposite to the bottom surface of the groove of the stator core, and the first side part of the insulation paper is provided with a bulge, so that the strength of the insulation paper can be improved, blockage during insertion of the insulation paper is avoided, and the insulation paper can be conveniently inserted into the groove; moreover, the insulation paper can be conveniently positioned, and the insulation paper is prevented from protruding out of the stator core in the radial direction.

Description

Technical Field

[0001] This utility model relates to the field of electromechanical engineering, and in particular to a stator assembly and a motor. Background Technology

[0002] The stator assembly of the motor includes a stator core and a stator coil. Insulating paper is placed between the stator core and the stator coil to insulate them.

[0003] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0004] The inventors discovered that insufficient folding during the forming of the insulating paper reduces its strength, leading to blockage when it is inserted into the stator core. Furthermore, insufficient folding also results in inaccurate positioning of the insulating paper within the stator core. For example, after insertion, the end of the insulating paper may protrude from the stator core, causing unreliable insulation between the stator core and the stator coils, and creating an unsightly appearance.

[0005] To address one or more of the aforementioned problems or other similar issues, this utility model provides a stator assembly and a motor. The insulating paper in the stator assembly has a first side portion facing the bottom of a slot in the stator core. By forming a protrusion on the first side portion of the insulating paper, the strength of the insulating paper is increased, thereby preventing blockage during insertion and facilitating insertion into the slot. Furthermore, it facilitates positioning of the insulating paper, preventing it from protruding radially from the stator core.

[0006] According to one aspect of the present invention, a stator assembly is provided, the stator assembly comprising: a stator core having a plurality of axially penetrating slots; a stator coil having at least a portion therein housed in the slots; and insulating paper disposed in the slots between the stator core and the stator coils, wherein the insulating paper includes a first side facing the bottom surface of the slot, the first side having an axially extending protrusion protruding toward the bottom surface.

[0007] In one or more embodiments, the protrusion extends from one axial end of the first side portion to the other axial end of the first side portion.

[0008] In one or more embodiments, the first side portion includes an inclined portion and a bottom, the inclined portion extending from the bottom toward the bottom surface and the side of the groove to form the protrusion.

[0009] In one or more embodiments, the groove includes a bottom surface and a first side surface and a second side surface connected to the bottom surface, a first angle is formed at the connection between the bottom surface and the first side surface, a second angle is formed at the connection between the bottom surface and the second side surface, and the protrusion contacts at least one of the first angle and the second angle.

[0010] In one or more embodiments, the protrusion includes a first protrusion and a second protrusion, the first protrusion and the second protrusion being located at opposite ends of the first side portion in the circumferential direction.

[0011] In one or more embodiments, the first side portion has a recess formed between the first protrusion and the second protrusion.

[0012] In one or more embodiments, the insulating paper further includes a second side and a third side, wherein the second side faces a first side of the groove, the third side faces a second side of the groove, and the first side connects the second side and the third side.

[0013] A first crease is formed at the junction of the first side and the second side, and a second crease is formed at the junction of the first side and the third side.

[0014] The first side portion has a third crease and a fourth crease, which are located between the first crease and the second crease.

[0015] The first side portion includes a first inclined portion connecting the first crease and the third crease, a second inclined portion connecting the second crease and the fourth crease, and a bottom portion connecting the third crease and the fourth crease.

[0016] In one or more embodiments, a third angle is formed between the first inclined portion and the second side portion.

[0017] A fourth angle is formed between the second inclined portion and the third side portion.

[0018] The angles of the third angle and the fourth angle are equal, and the angles of the third angle and the fourth angle are less than 90 degrees.

[0019] In one or more embodiments, when viewed axially, the distance between the first crease and the second crease is equal to the width of the bottom surface of the groove.

[0020] According to another aspect of the present invention, a motor is provided, the motor including the stator assembly described above.

[0021] One of the beneficial effects of this utility model embodiment is that the insulating paper in the stator assembly has a first side facing the bottom of the slot of the stator core. By forming a protrusion on the first side of the insulating paper, the strength of the insulating paper can be increased, thereby avoiding blockage when inserting the insulating paper and making it easier to insert the insulating paper into the slot; and, it is convenient to position the insulating paper and prevent the insulating paper from protruding from the stator core in the radial direction.

[0022] The embodiments of this utility model are disclosed in detail with reference to the following description and accompanying drawings. It should be understood that the embodiments of this utility model are not limited in scope thereto. Within the spirit and scope of the appended claims, the embodiments of this utility model include many changes, modifications, and equivalents.

[0023] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0024] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the embodiments of the present invention and illustrate the implementation of the present invention together with the text description. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0025] Figure 1 This is a schematic diagram of a stator assembly according to an embodiment of the present invention;

[0026] Figure 2 This is a partially enlarged view of the stator assembly according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the insulating paper according to an embodiment of the present invention;

[0028] Figure 4 This is another schematic diagram of the insulating paper according to an embodiment of the present invention;

[0029] Figure 5 This is a cross-sectional view of the insulating paper according to an embodiment of the present invention;

[0030] Figure 6 This is another cross-sectional view of the insulating paper according to an embodiment of the present invention. Detailed Implementation

[0031] Referring to the accompanying drawings, the foregoing and other features of this utility model will become apparent from the following description. Specific embodiments of this utility model are specifically disclosed in the description and drawings, illustrating partial implementations in which the principles of this utility model can be employed. It should be understood that this utility model is not limited to the described embodiments; rather, it includes all modifications, variations, and equivalents falling within the scope of the appended claims.

[0032] In embodiments of this utility model, the term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," etc., refer to the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.

[0033] In this embodiment of the invention, the singular forms "a," "the," etc., may include the plural forms and should be broadly interpreted as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.

[0034] Furthermore, in the following description of this utility model, for ease of explanation, the direction extending along or parallel to the central axis OO' of the stator assembly is referred to as the "axial direction," the radial direction centered on the central axis OO' is referred to as the "radial direction," the direction around the central axis OO' is referred to as the "circumferential direction," the side away from the central axis OO' along the radial direction is referred to as the "radial outer side," and the side closer to the central axis OO' along the radial direction is referred to as the "radial inner side." However, it is worth noting that these are merely for ease of explanation and do not limit the orientation of the stator assembly during use and manufacturing.

[0035] The embodiments of this utility model will now be described with reference to the accompanying drawings.

[0036] This utility model provides a stator assembly.

[0037] Figure 1 This is a schematic diagram of a stator assembly according to an embodiment of the present invention. Figure 2 This is a partially enlarged view of the stator assembly according to an embodiment of the present invention.

[0038] like Figure 1As shown, the stator assembly 100 includes a stator core 10, a stator coil 20, and insulating paper 30. The stator core 10 is provided with a plurality of axially extending slots 11. At least a portion of the stator coil 20 is housed in the slots 11. The insulating paper 30 is disposed in the slots 11 and located between the stator core 10 and the stator coil 20. The insulating paper 30 includes a first side portion 31 opposite to the bottom surface 111 of the slot 11, and the first side portion 31 forms an axially extending protrusion 311 protruding toward the bottom surface 111 of the slot 11.

[0039] According to the above embodiment, the insulating paper in the stator assembly has a first side facing the bottom of the slot of the stator core. By forming a protrusion on the first side of the insulating paper, the strength of the insulating paper can be increased, thereby avoiding blockage when inserting the insulating paper and facilitating the insertion of the insulating paper into the slot. Furthermore, it facilitates the positioning of the insulating paper and prevents the insulating paper from protruding from the stator core in the radial direction, thereby avoiding problems such as unreliable insulation between the stator core and the stator coil and unsightly appearance.

[0040] For example, such as Figure 2 As shown, the stator core 10 includes a yoke 12 and a plurality of teeth 14 protruding radially from the inner surface 121 of the yoke 12. The plurality of teeth 14 are arranged at intervals along the circumference of the yoke 12. A slot 11 is formed between two adjacent teeth 14, and the plurality of slots 11 are arranged at intervals along the circumference of the yoke 12. The slots 11 penetrate the stator core 10 axially. The stator coil 20 is inserted into the slot 11. To electrically insulate the stator coil 20 from the stator core 10, insulating paper 30 is disposed between the stator coil 20 and the slot 11. For example, the insulating paper 30 is inserted into the slot 11 first, and then the stator coil 20 is inserted into the slot 11.

[0041] The structure of slot 11 is described below as an example.

[0042] For example, such as Figure 2 As shown, the groove 11 includes a bottom surface 111, and a first side surface 112 and a second side surface 113 connected to the bottom surface 111. The bottom surface 111, the first side surface 112, and the second side surface 113 all extend axially from one end of the stator core 10 to the other end of the stator core 10. The bottom surface 111 is located on the inner side surface 121 of the yoke 12 of the stator core 10. The first side surface 112 and the second side surface 113 are located at opposite ends of the bottom surface 111 in the circumferential direction and extend radially from the bottom surface 111 toward one end of the tooth 14. A first angle A1 is formed at the junction of the bottom surface 111 and the first side surface 112, and a second angle A2 is formed at the junction of the bottom surface 111 and the second side surface 113.

[0043] The above description illustrates the structure of the stator core 10 by taking the example of the tooth 14 extending radially inward from the inner side of the yoke 12. This utility model is not limited to this. In some embodiments, the stator core 10 may also be in the form of the tooth 14 extending radially outward from the outer side of the yoke 12.

[0044] The structure of the insulating paper 30 is described below by way of example. Figure 3 This is a schematic diagram of the insulating paper according to an embodiment of the present invention. Figure 4 This is another schematic diagram of the insulating paper according to an embodiment of the present invention. Figure 5 This is a cross-sectional view of the insulating paper according to an embodiment of the present invention.

[0045] For example, such as Figures 3 to 5 As shown, the insulating paper 30 has a first side portion 31, a second side portion 32, and a third side portion 33. The first side portion 31 connects the second side portion 32 and the third side portion 33. For example, the second side portion 32 and the third side portion 33 are located at opposite ends of the first side portion 31 in the circumferential direction. The first side portion 31 of the insulating paper 30 faces the bottom surface 111 of the groove 11, the second side portion 32 of the insulating paper 30 faces the first side surface 112 of the groove 11, and the third side portion 33 of the insulating paper 30 faces the second side surface 113 of the groove 11.

[0046] For example, to achieve better electrical insulation, the shape and size of the insulating paper 30 are approximately the same as or match the shape and size of the groove 11. For instance, the axial lengths of the first side portion 31, the second side portion 32, and the third side portion 33 are equal to or slightly greater than the axial length of the groove 11, which is the axial length of the stator core 10; the circumferential length of the first side portion 31 (denoted as L) 31 The length of the bottom surface 111 of the groove 11 in the circumferential direction is equal to or slightly smaller than the length of the bottom surface 111 of the groove 11 (denoted as L). 111 ), where L 31 Slightly smaller than L 111 The meaning is L 111 With L 31 The difference is within a first set range; the lengths of the second side portion 32 and the third side portion 33 in the direction extending from the bottom surface 111 of the groove 11 to one radial end of the tooth 14 (denoted as L respectively) 32 L 33 The lengths of the first side surface 112 and the second side surface 113 of the groove 11, respectively, in the direction extending from the bottom surface 111 of the groove 11 towards one radial end of the tooth 14, are respectively denoted as L. 112 L 113 ), that is, L 32 Equal to or slightly greater than L 112 L 33 Equal to or slightly greater than L 113 , where L 32Slightly larger than L 112 The meaning is L 32 With L 112 The difference is within the second set range, L 33 Slightly larger than L 113 The meaning is L 33 With L 113 The difference is within the third set range. That is, when the insulating paper 30 is inserted into the slot 11, the insulating paper 30 can fully cover each surface of the slot 11, thereby reliably providing electrical insulation to the stator core 10 and the stator coil 20.

[0047] For example, in L 31 Slightly smaller than L 111 In the case of L 32 It can be slightly larger than L 112 L 33 It can be slightly larger than L 113 And, L 31 L 32 and L 33 The sum can be greater than L 111 L 112 and L 113 The sum. Therefore, through L... 31 Slightly smaller than L 111 This makes it easier for the first side portion 31 of the insulating paper 30 to be smoothly inserted into the groove 11, and, with the insulating paper 30 inserted into the groove 11, due to L 31 L 32 and L 33 The sum is greater than L 111 L 112 and L 113 Therefore, the insulating paper 30 can fully cover all surfaces of the slot 11, thereby reliably providing electrical insulation to the stator core 10 and the stator coil 20.

[0048] For example, in L 31 equal to L 111 In the case of L 32 It can be equal to or slightly greater than L. 112 L 33 It can be equal to or slightly greater than L. 113 Therefore, L 31 L 32 and L 33 The sum is equal to or slightly greater than L 111 L 112 and L 113 Thus, with the insulating paper 30 inserted into the slot 11, the insulating paper 30 can fully cover each surface of the slot 11, thereby reliably providing electrical insulation to the stator core 10 and the stator coil 20.

[0049] For example, such as Figures 3 to 5 As shown, the first side portion 31 of the insulating paper 30 has at least one protrusion 311, which protrudes toward the bottom surface 111 of the groove 11 and extends axially for a certain length. In some embodiments, the protrusion 311 extends from one axial end of the first side portion 31 of the insulating paper 30 to the other axial end of the first side portion 31. That is, the axial extension length of the protrusion 311 is equal to the axial extension length of the first side portion 31. This ensures the strength of the insulating paper at all axial positions, thereby further increasing the strength of the insulating paper.

[0050] For example, such as Figure 5 As shown, the first side portion 31 of the insulating paper 30 includes an inclined portion 312 and a bottom portion 313. The protrusion 311 is formed by the inclined portion 312 extending from the bottom portion 313 toward the bottom surface 111 and the first side surface 112 of the groove 11, or the protrusion 311 is formed by the inclined portion 312 extending from the bottom portion 313 toward the bottom surface 111 and the second side surface 113 of the groove 11. That is, the protrusion 311 includes an inclined portion 312 that extends from the bottom portion 313 toward the junction of the bottom surface 111 and the first side surface 112 of the groove 11 (e.g., the first angle A1), or the inclined portion 312 extends from the bottom portion 313 toward the junction of the bottom surface 111 and the second side surface 113 of the groove 11 (e.g., the second angle A2).

[0051] For example, the protrusion 311 contacts at least one of the first angle A1 and the second angle A2. The angular contact between the protrusion 311 and the groove 11 facilitates reliable positioning of the insulating paper 30.

[0052] For example, this utility model does not limit the shape, number, and location of the protrusions 311. For example, the shape of the protrusions 311 can be semi-circular, arched, triangular, etc., the number of protrusions 311 can be one, two, or more, and the protrusions 311 can be located at various positions such as the end of the first side portion 31 in the circumferential direction or the center of the first side portion 31 in the circumferential direction.

[0053] The insulating paper of this utility model will be described exemplarily below using the case where "two protrusions are formed on the first side". Figure 6 This is another cross-sectional view of the insulating paper according to an embodiment of the present invention, showing the case where "two protrusions are formed on the first side".

[0054] In some embodiments, such as Figure 6As shown, the first side portion 31 has a first protrusion 315 and a second protrusion 316, which are located at opposite ends of the first side portion 31 in the circumferential direction. For example, the first protrusion 315 contacts the first corner A1 of the groove 11, and the second protrusion 316 contacts the second corner A2 of the groove 11. By having the first protrusion 315 and the second protrusion 316 contact the two corners of the groove 11 respectively, it is easier to reliably position the insulating paper 30.

[0055] In some embodiments, such as Figure 6 As shown, a recess 314 is formed between the first protrusion 315 and the second protrusion 316 in the first side portion 31. By forming the recess 314 between the first protrusion 315 and the second protrusion 316, the first protrusion 315 and the second protrusion 316 can be made more prominent, thereby further increasing the strength of the insulating paper 30 and facilitating the positioning of the insulating paper 30.

[0056] For example, at least a portion of the bottom 313 of the first side portion 31 located between the first protrusion 315 and the second protrusion 316 is formed with a recess 314. However, the present invention is not limited to this, and the bottom 313 between the first protrusion 315 and the second protrusion 316 may also be formed with a protrusion, a plane or other shaped structure.

[0057] In some embodiments, such as Figure 6 As shown, in the insulating paper 30, a first crease 3151 is formed at the connection between the first side portion 31 and the second side portion 32; a second crease 3161 is formed at the connection between the first side portion 31 and the third side portion 33; the first side portion 31 has a third crease 3152 and a fourth crease 3162, wherein the third crease 3152 and the fourth crease 3162 are located between the first crease 3151 and the second crease 3161. The first side portion 31 includes a first inclined portion 317 connecting the first crease 3151 and the third crease 3152, a second inclined portion 318 connecting the second crease 3161 and the fourth crease 3162, and a bottom portion 313 connecting the third crease 3152 and the fourth crease 3162. By setting the creases, the connection between the first side portion 31 and the second side portion 32 and the connection between the first side portion 31 and the third side portion 33 becomes sharper, thereby further increasing the strength of the insulating paper 30 and facilitating the positioning of the insulating paper 30.

[0058] For example, the first protrusion 315 includes a first inclined portion 317 connecting the first crease 3151 and the third crease 3152. The first crease 3151 is located at the top of the first protrusion 315, and the third crease 3152 is located at the boundary between the first protrusion 315 and the bottom 313. The first protrusion 315 is formed by the first inclined portion 317 extending from the bottom 313 toward the bottom surface 111 and the first side surface 112 of the groove 11.

[0059] For example, the second protrusion 316 includes a second inclined portion 318 connecting the second crease 3161 and the fourth crease 3162. The second crease 3161 is located at the top of the second protrusion 316, and the fourth crease 3162 is located at the boundary between the second protrusion 316 and the bottom 313. The second protrusion 316 is formed by the second inclined portion 318 extending from the bottom 313 toward the bottom surface 111 and the second side surface 113 of the groove 11.

[0060] In some embodiments, such as Figure 6 As shown, a third angle A3 is formed between the first inclined portion 317 and the second side portion 32, and a fourth angle A4 is formed between the second inclined portion 318 and the third side portion 33. The angles of the third angle A3 and the fourth angle A4 are equal, and the angle between the third angle A3 and the fourth angle A4 is less than 90 degrees. The acute angles between the first inclined portion 317 and the second side portion 32, and between the second inclined portion 318 and the third side portion 33, further facilitate the positioning of the insulating paper 30.

[0061] For example, the angle of the third angle A3 formed between the first inclined portion 317 and the second side portion 32 is less than 90 degrees, that is, the angle of the top of the first protrusion 315 is less than 90 degrees, and this third angle A3 contacts the first angle A1 of the groove 11. The angle of the fourth angle A4 formed between the second inclined portion 318 and the third side portion 33 is less than 90 degrees, that is, the angle of the top of the second protrusion 316 is less than 90 degrees, and this fourth angle A4 contacts the second angle A2 of the groove 11.

[0062] In some embodiments, when viewed axially, the distance between the first crease 3151 and the second crease 3161 is equal to the width of the bottom surface 111 of the groove 11. This makes it easier to position the insulating paper 30.

[0063] However, this utility model is not limited thereto. For example, the distance S between the first crease 3151 and the second crease 3161 3151-3161 It can also be slightly smaller than the circumferential length L of the bottom surface 111 of groove 11. 111 , of which S 3151-3161 Slightly smaller than L 111 The meaning is S 3151-3161 With L 111 The difference is within the fourth set range.

[0064] According to the above embodiment, the insulating paper in the stator assembly has a first side facing the bottom of the slot of the stator core. By forming a protrusion on the first side of the insulating paper, the strength of the insulating paper can be increased, thereby avoiding blockage when inserting the insulating paper and facilitating the insertion of the insulating paper into the slot. Furthermore, it facilitates the positioning of the insulating paper and prevents the insulating paper from protruding from the stator core in the radial direction, thereby avoiding problems such as unreliable insulation between the stator core and the stator coil and unsightly appearance.

[0065] This utility model embodiment also provides a motor, which includes the stator assembly described above. For other motor structures, please refer to related technologies, which will not be elaborated here.

[0066] It is worth noting that the above description is merely illustrative, but the present invention is not limited thereto, and appropriate modifications can be made based on the above embodiments. Furthermore, the above description is merely illustrative of the various components, but the present invention is not limited thereto, and the specific details of each component can be found in related technologies; additionally, components not shown in the figures can be added, or one or more components in the figures can be removed.

[0067] The present invention has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present invention. Those skilled in the art can make various modifications and variations to the present invention based on its principles, and these modifications and variations are also within the scope of the present invention.

[0068] Preferred embodiments of the present invention have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are apparent from this detailed description, and therefore the appended claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of the present invention are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.

Claims

1. A stator assembly, characterized in that, The stator assembly includes: The stator core has multiple slots that run through the axial direction. Stator coils, at least a portion of which are housed in the slots; and Insulating paper, disposed in the slot, is located between the stator core and the stator coil. The insulating paper includes a first side portion facing the bottom surface of the groove, and the first side portion has an axially extending protrusion protruding toward the bottom surface.

2. The stator assembly according to claim 1, characterized in that, The protrusion extends from one axial end of the first side to the other axial end of the first side.

3. The stator assembly according to claim 1, characterized in that, The first side portion includes an inclined portion and a bottom, the inclined portion extending from the bottom toward the bottom surface and the side of the groove to form the protrusion.

4. The stator assembly according to claim 1, characterized in that, The groove includes a bottom surface and a first side surface and a second side surface connected to the bottom surface. A first angle is formed at the connection between the bottom surface and the first side surface, and a second angle is formed at the connection between the bottom surface and the second side surface. The protrusion contacts at least one of the first corner and the second corner.

5. The stator assembly according to claim 1, characterized in that, The protrusion includes a first protrusion and a second protrusion, which are located at opposite ends of the first side portion in the circumferential direction.

6. The stator assembly according to claim 5, characterized in that, The first side portion has a recess formed between the first protrusion and the second protrusion.

7. The stator assembly according to claim 5, characterized in that, The insulating paper further includes a second side portion and a third side portion, wherein the second side portion faces the first side portion of the groove, the third side portion faces the second side portion of the groove, and the first side portion connects the second side portion and the third side portion. A first crease is formed at the junction of the first side and the second side, and a second crease is formed at the junction of the first side and the third side. The first side portion has a third crease and a fourth crease, which are located between the first crease and the second crease. The first side portion includes a first inclined portion connecting the first crease and the third crease, a second inclined portion connecting the second crease and the fourth crease, and a bottom portion connecting the third crease and the fourth crease.

8. The stator assembly according to claim 7, characterized in that, A third angle is formed between the first inclined portion and the second side portion. A fourth angle is formed between the second inclined portion and the third side portion. The angles of the third angle and the fourth angle are equal, and the angles of the third angle and the fourth angle are less than 90 degrees.

9. The stator assembly according to claim 7, characterized in that, Viewed along the axial direction, the distance between the first crease and the second crease is equal to the width of the bottom surface of the groove.

10. A motor, characterized in that, The motor includes the stator assembly as described in any one of claims 1 to 9.

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