Stator core and motor

Abstract

The invention relates to a stator core and a motor, the stator core comprises an inner stator and an outer stator, the inner stator comprises an annular fixing part and a stator tooth part arranged on the outer ring of the fixing part, the stator tooth part comprises a plurality of stator teeth, the plurality of stator teeth are arranged at intervals along the circumferential direction of the fixing part, and the stator teeth extend in the direction away from the fixing part. A stator slot is formed between every two adjacent stator teeth and the fixed part, the plurality of stator teeth are annularly arranged, the stator teeth are arc-shaped teeth, and the bending directions of the plurality of stator teeth are consistent; the outer stator sleeves the outer side of the inner stator, the outer stator comprises a plurality of stator blocks, and every two adjacent stator blocks are detachably connected. According to the stator iron core provided by the invention, the plurality of stator blocks of the outer stator can be spliced on the outer side of the inner stator in a block-to-block manner, so that adverse effects such as pressure loss and scratch loss on a coil winding on the inner stator in the assembly process of the outer stator are avoided, and the arc-shaped stator teeth can guide the coil to enter the stator grooves, so that the coil can be conveniently wound and fixed on the stator teeth.

Description

Technical Field

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

[0002] A motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. It consists of a main shaft, a stator assembly, and a rotor assembly. The stator assembly is the stationary part of the motor and includes the stator core, winding support, and stator windings.

[0003] Currently, the stator core typically consists of an outer stator and an inner stator nested within it. Coils are wound around the inner stator's stator teeth to generate a varying magnetic field. Because the outer stator is an integrated structure, the outer stator can easily cause pressure loss and scratches on the inner stator's coil windings during assembly. Furthermore, the narrow gap between adjacent stator teeth on the inner stator makes coil winding difficult, severely impacting the stator core's quality. Summary of the Invention

[0004] Based on this, it is necessary to provide a stator core and a motor to address the problem that the coil winding is difficult to wind and easily causes pressure loss and scratches to the coil winding during the assembly process of the stator core.

[0005] A stator core, comprising:

[0006] An inner stator, the inner stator comprising an annular fixed portion and a stator tooth portion disposed on an outer ring of the fixed portion, the stator tooth portion comprising a plurality of stator teeth, the plurality of stator teeth being spaced apart along the circumferential direction of the fixed portion and extending in a direction away from the fixed portion, a stator slot being formed between two adjacent stator teeth and the fixed portion, the plurality of stator teeth being arranged in an annular shape, the stator teeth being arc-shaped, and the plurality of stator teeth having a consistent curvature direction;

[0007] The outer stator is sleeved on the outer side of the inner stator. The outer stator includes a plurality of stator blocks, and two adjacent stator blocks are detachably connected.

[0008] In one embodiment, the outer stator includes a first stator group and a second stator group, each of the first stator group and the second stator group includes a plurality of stator blocks, the plurality of stator blocks in the first stator group and the second stator group are arranged in a ring shape outside the inner stator, the first stator group and the second stator group are layered in the axial direction of the inner stator, and a gap between the first stator group and the second stator group is formed to form an oil injection channel;

[0009] A first oil guide channel communicating with the oil injection channel is provided in the stator slot.

[0010] In one embodiment, the stator tooth has an oil guide protrusion protruding toward the inside of the stator slot, the outer contour of the oil guide protrusion is an arc-shaped surface, and the first oil guide channel is formed between the oil guide protrusion, the stator tooth and the fixing portion.

[0011] In one embodiment, the oil guiding protrusion has an arc-shaped outer contour, and the oil guiding protrusion is bent toward the fixing portion.

[0012] In one embodiment, the inner stator includes a first punching sheet, a second punching sheet, a third punching sheet, the second punching sheet and the first punching sheet stacked in sequence, and the stator teeth of the two second punching sheets are provided with an oil guide notch on the side of the end facing away from the fixed portion, and a second oil guide channel is formed between the oil guide notch and the stator teeth of the second punching sheet, and the second oil guide channel is connected to the oil injection channel.

[0013] In one embodiment, the two first punches are provided with a pressing portion on one side of the end away from the fixing portion;

[0014] When the outer stator is sleeved on the outer side of the inner stator, in the axial direction of the inner stator, the pressed portions of the two first punching sheets are respectively pressed on opposite ends of the outer stator.

[0015] In one embodiment, one of the two adjacent stator blocks is provided with a hook portion, and the other one is provided with a slot portion cooperating with the hook portion.

[0016] In one embodiment, the inner stator is one of a silicon steel part, an amorphous alloy part, and a nanocrystalline alloy part;

[0017] The outer stator is one of a silicon steel part, an amorphous alloy part and a nanocrystalline alloy part.

[0018] In one embodiment, the stator tooth has a first arcuate surface and a second arcuate surface on one side close to two adjacent stator slots, respectively. The first arcuate surface and the second arcuate surface are used to guide coil winding.

[0019] A motor, comprising:

[0020] A stator core as described in any of the above technical solutions.

[0021] The stator core and motor described above feature an outer stator comprising multiple stator segments. Adjacent stator segments are detachably connected, allowing the segments of the outer stator to be individually spliced onto the outer side of the inner stator. This prevents the outer stator from causing adverse effects such as pressure loss and scratches on the coil windings on the inner stator during assembly. Furthermore, the stator teeth are curved, which guide the coils into the stator slots, facilitating coil winding and fixation on the stator teeth and simplifying the stator core assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the stator core provided in some embodiments.

[0023] Figure 2 This is a schematic diagram of an exploded view of the inner stator provided in some embodiments.

[0024] Figure 3 for Figure 2 A partial enlarged view of area A in the middle.

[0025] Figure 4 It is a front view of the stator core provided in some embodiments.

[0026] Figure 5 for Figure 4 A partial enlarged view of area B in the middle.

[0027] Figure 6 Schematic diagram of the structure of the stator block provided in some embodiments.

[0028] Reference numerals:

[0029] 100. stator core;

[0030] 110, inner stator; 111, fixing portion; 112, stator tooth portion; 1121, stator tooth; 1122, first arcuate surface; 1123, second arcuate surface; 113, stator slot; 114, first oil guide channel; 115, oil guide protrusion; 116, first punching plate; 1161, pressing portion; 117, second punching plate; 1171, oil guide notch; 118, third punching plate; 119, second oil guide channel;

[0031] 120. Outer stator; 121. Stator block; 1211. Hook portion; 1212. Slot portion; 122. First stator assembly; 123. Second stator assembly; 124. Oil injection channel. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0038] The technical solutions provided by the embodiments of the present application are described below with reference to the accompanying drawings.

[0039] See Figure 1 and Figure 2 As shown, the present application provides a stator core 100, which includes an inner stator 110 and an outer stator 120. The stator core 100 is used to fix the coil windings and ensure efficient conversion or transmission of the electric field inside the motor.

[0040] The inner stator 110 includes an annular fixed portion 111 and a stator tooth portion 112, which is disposed on the outer ring of the fixed portion 111. Preferably, the stator tooth portion 112 and the fixed portion 111 are integrally formed, simplifying the molding process of the inner stator 110 while improving the structural strength of the inner stator 110. The stator tooth portion 112 includes a plurality of stator teeth 1121, which are spaced apart along the circumference of the fixed portion 111 and extend away from the fixed portion 111. For example, one end of each stator tooth 1121 is connected to the outer ring of the fixed portion 111, and the other end extends away from the fixed portion 111. Stator slots 113 are formed between adjacent stator teeth 1121 and the fixed portion 111. The plurality of stator teeth 1121 are arranged in a circular pattern, are arc-shaped, and have the same curvature. Since the stator teeth 1121 are arc-shaped teeth, the stator slots 113 formed by two adjacent stator teeth 1121 are also arc-shaped slots. The stator slots 113 can be used to accommodate and fix the coil windings. The arc-shaped stator teeth 1121 can guide the coils into the stator slots 113, making it convenient for the coils to be wound and fixed on the stator teeth 1121. Moreover, since the stator slots 113 are arc-shaped slots, especially for flat coils, the coils do not need to distinguish the circumferential direction of the coils during the winding process. The coils can be wound into the slots through the guidance of the stator slots 113, and the coils can be ensured to fit the fixing portion 111, thereby reducing the noise impact of the stator core 100.

[0041] The outer stator 120 is sleeved onto the outer side of the inner stator 110. The outer stator 120 comprises multiple stator blocks 121, with adjacent stator blocks 121 detachably connected. This allows the multiple stator blocks 121 to be individually spliced onto the outer side of the inner stator 110, where the coil windings are wound. Specifically, the coil windings are first wound onto the inner stator 110 before the outer stator 120 is spliced onto the outer side of the inner stator 110. This prevents the outer stator 120 from causing adverse effects such as pressure loss or scratches on the coil windings of the inner stator 110 during assembly.

[0042] In one embodiment, see Figure 1-Figure 3 As shown, the outer stator 120 includes a first stator group 122 and a second stator group 123. The first stator group 122 and the second stator group 123 each include a plurality of stator blocks 121. The plurality of stator blocks 121 in the first stator group 122 and the second stator group 123 are arranged in a ring outside the inner stator 110. For example, see Figure 1As shown, the first stator assembly 122 and the second stator assembly 123 each include six stator blocks 121, wherein six stator blocks 121 are connected end-to-end to form the first stator assembly 122, and another six stator blocks 121 are connected end-to-end to form the second stator assembly 123. The first stator assembly 122 and the second stator assembly 123 have an annular structure, and the central portion of each of the first stator assembly 122 and the second stator assembly 123 has a space for accommodating the inner stator 110. Of course, in other feasible embodiments, the number of stator blocks 121 included in the first stator assembly 122 and the second stator assembly 123 is not limited to the six provided above, and may also be other numbers. The first stator assembly 122 and the second stator assembly 123 formed by other numbers of stator blocks 121 can be specifically configured according to the above embodiment and will not be further described here. The first stator assembly 122 and the second stator assembly 123 are layered in the axial direction of the inner stator 110, with a gap between the layers to form an oil injection channel 124. A first oil guide channel 114 is provided in the stator slot 113 and communicates with the oil injection channel 124.

[0043] In the above-mentioned stator core 100, since the first stator group 122 and the second stator group 123 are arranged in layers, a gap is provided between the first stator group 122 and the second stator group 123 to form an oil injection channel 124. A cooling medium (such as cooling oil) is injected into the oil injection channel 124, and the cooling medium flows through the oil injection channel 124 to the first oil guide channel 114. During the flow of the cooling medium in the first oil guide channel 114, the cooling medium can carry away the heat generated by the inner stator 110, thereby cooling the stator core 100.

[0044] Specifically, see Figure 1-Figure 3 As shown, stator teeth 1121 have oil-guiding protrusions 115 protruding toward the interior of stator slots 113. The outer contour of oil-guiding protrusions 115 is an arcuate surface. A first oil-guiding channel 114 is formed between oil-guiding protrusions 115, stator teeth 1121, and fixed portion 111. As such, because the outer contour of oil-guiding protrusions 115 is an arcuate surface, first oil-guiding channel 114 can guide the cooling medium, and oil-guiding protrusions 115 do not hinder the flow of the cooling medium. The flow rate of the cooling medium within first oil-guiding channel 114 tends to be consistent, improving the smoothness of the cooling medium's flow within first oil-guiding channel 114. This ensures that the cooling medium maintains a consistently low temperature while flowing within first oil-guiding channel 114, thereby enhancing the cooling effect of the cooling medium on the stator core 100.

[0045] Further, see Figure 1-Figure 3As shown, the oil-guiding protrusion 115 has an arcuate outer profile and is curved toward the fixing portion 111. In other words, the oil-guiding protrusion 115 is curved toward the interior of the inner stator 110. As a result, when the coolant flows into the first oil-guiding channel 114, the oil-guiding protrusion 115 prevents the coolant from overflowing, confining the coolant to the first oil-guiding channel 114. This ensures that the first oil-guiding channel 114 is always filled with coolant, ensuring that the coolant effectively cools the stator core 100.

[0046] In one embodiment, see Figure 1-Figure 3 As shown, the inner stator 110 includes a first punching 116, a second punching 117, a third punching 118, and the second punching 117 and the first punching 116, which are stacked in sequence. In other words, the inner stator 110 is a laminated design. This not only reduces losses in the stator core 100, but also conducts heat from the inner stator 110 to the external environment, improving the heat dissipation of the stator core 100. The stator teeth 1121 of the two second punchings 117 are provided with oil guide notches 1171 on the ends facing away from the fixing portion 111. A second oil guide channel 119 is formed between the oil guide notches 1171 and the stator teeth 1121 of the second punchings 117. The second oil guide channel 119 is connected to the oil injection channel 124.

[0047] Among them, since the second oil guiding channel 119 is connected to the oil injection channel 124, when the cooling medium is introduced into the oil injection channel 124, part of the cooling medium flows to the first oil guiding channel 114 to remove the heat generated by the inner stator 110 near the first oil guiding channel 114, and the other part of the cooling medium flows to the second oil guiding channel 119 to remove the heat generated by the inner stator 110 near the second oil guiding channel 119. Since the first oil guiding channel 114 is close to the inner side of the inner stator 110 and the second oil guiding channel 119 is close to the outer side of the inner stator 110, the cooling effect of the stator core 100 can be improved by the coordinated flow of the cooling medium in the first oil guiding channel 114 and the second oil guiding channel 119. In addition, the first oil guiding channel 114 removes the heat near the inner side of the inner stator 110, and the second oil guiding channel 119 removes the heat near the outer side of the inner stator 110, thereby ensuring that the temperature of each area of the inner stator 110 tends to be consistent, thereby ensuring the working stability of the stator core 100.

[0048] Specifically, see Figure 4As shown, the cooling medium is introduced into the oil injection channel 124 along the S direction. Since the first stator group 122 and the second stator group 123 are arranged in layers along the axial direction of the inner stator 110, the cooling medium flows along the V direction toward the first oil guide channel 114 and the second oil guide channel 119 on both sides of the stator core 100. During the flow of the cooling medium in the first oil guide channel 114 and the second oil guide channel 119, the cooling medium can take away the heat generated by the inner stator 110, thereby cooling the stator core 100 and maintaining the stator core 100 in a better working environment.

[0049] In one embodiment, see Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, the two first punches 116 are provided with a pressing portion 1161 on one side of the end away from the fixing portion 111. When the outer stator 120 is sleeved on the outside of the inner stator 110, the pressing portions 1161 of the two first punches 116 are respectively pressed on the opposite ends of the outer stator 120 in the axial direction of the inner stator 110. For example, the size of the first punch 116 is larger than the size of the second punch 117 and the third punch 118. When the outer stator 120 is sleeved on the outside of the second punch 117 and the third punch 118, the portion of the first punch 116 extending out of the second punch 117 and the third punch 118 is pressed on the opposite ends of the outer stator 120 to axially limit the outer stator 120 and avoid the undesirable phenomenon of axial movement of the outer stator 120 during operation, thereby improving the structural stability of the stator core 100.

[0050] In one embodiment, see Figure 1 and Figure 6 As shown, one of the two adjacent stator blocks 121 is provided with a hook portion 1211, and the other of the two adjacent stator blocks 121 is provided with a slot portion 1212. For example, the hook portion 1211 and the slot portion 1212 are provided at opposite ends of the stator block 121. During the connection process of the two adjacent stator blocks 121, the hook portion 1211 of one stator block 121 engages with the slot portion 1212 of the other stator block 121, achieving a detachable connection between the two adjacent stator blocks 121, thereby allowing the multiple stator blocks 121 to be spliced separately on the outside of the inner stator 110.

[0051] Preferably, the hook portion 1211 and the slot portion 1212 are both disposed on one side of the interior of the stator block 121. After two adjacent stator blocks 121 are connected, the hook portion 1211 and the slot portion 1212 are hidden within the stator core 100, thereby reducing the overall volume of the stator core 100 and achieving a miniaturized design of the stator core 100. Furthermore, the hook portion 1211 and the slot portion 1212 are integrally formed with the stator block 121 to enhance the structural strength of the stator block 121.

[0052] Of course, in other feasible embodiments, two adjacent stator blocks 121 may also be detachably connected by magnetic attraction, screw connection, etc. The present application does not limit the specific connection method between the two adjacent stator blocks 121.

[0053] In one embodiment, see Figure 1 As shown, the inner stator 110 is made of one of silicon steel, amorphous alloy, and nano-alloy. Furthermore, the outer stator 120 is made of one of silicon steel, amorphous alloy, and nano-alloy. This configuration of the inner and outer stators 110, 120 increases the magnetic permeability of the stator core 100, reduces residual magnetism, reduces eddy current losses and hysteresis losses, and enhances the structural strength of the stator core 100.

[0054] In one embodiment, see Figure 1-Figure 3 As shown, the stator tooth 1121 has a first curved surface 1122 and a second curved surface 1123 on one side near two adjacent stator slots 113. The first curved surface 1122 and the second curved surface 1123 are used to guide coil winding. For example, in one embodiment, the first curved surface 1122 is a concave curved surface, and the second curved surface 1123 is also a concave curved surface. During the winding process, the coil can enter the stator slot 113 along the concave first curved surface 1122 and the second curved surface 1123. The first curved surface 1122 and the second curved surface 1123 guide the coil into the stator slot 113, facilitating the coil's entry and winding. In another embodiment, the first curved surface 1122 is a convex curved surface, and the second curved surface 1123 is also a convex curved surface. During the winding process, the coil can enter the stator slot 113 along the convex first curved surface 1122 and the second curved surface 1123. The first curved surface 1122 and the second curved surface 1123 guide the coil into the stator slot 113, making it easier for the coil to enter the slot and be wound.

[0055] Also, see Figure 1-Figure 3 As shown, the present application also provides a motor, which includes a stator core 100 as described in the above technical solution.

[0056] In the aforementioned motor, the outer stator 120 includes a plurality of stator blocks 121. Adjacent stator blocks 121 are detachably connected, allowing the plurality of stator blocks 121 of the outer stator 120 to be individually spliced onto the outer side of the inner stator 110. This prevents the outer stator 120 from causing adverse effects such as pressure loss and scratches on the coil windings on the inner stator 110 during assembly. Furthermore, the stator teeth 1121 are arcuate teeth that guide the coils into the stator slots 113, facilitating the winding and securing of the coils on the stator teeth 1121 and simplifying the motor assembly process. Furthermore, because the stator slots 113 are arcuate, particularly for flat coils, there is no need to distinguish the circumferential direction of the coils during winding; the coils can be wound into the slots guided by the stator slots 113.

[0057] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A stator core, characterized in that: The stator core comprises: An inner stator, the inner stator comprising an annular fixed portion and a stator tooth portion disposed on an outer ring of the fixed portion, the stator tooth portion comprising a plurality of stator teeth, the plurality of stator teeth being spaced apart along the circumferential direction of the fixed portion and extending in a direction away from the fixed portion, a stator slot being formed between two adjacent stator teeth and the fixed portion, the plurality of stator teeth being arranged in an annular shape, the stator teeth being arc-shaped, and the plurality of stator teeth having a consistent curvature direction; The outer stator is sleeved on the outer side of the inner stator. The outer stator includes a plurality of stator blocks, and two adjacent stator blocks are detachably connected.

2. The stator core according to claim 1, characterized in that The outer stator includes a first stator group and a second stator group, each of which includes a plurality of stator blocks. The plurality of stator blocks in the first stator group and the second stator group are arranged in a ring shape outside the inner stator. The first stator group and the second stator group are layered in the axial direction of the inner stator, and a gap is formed between the layers to form an oil injection channel. A first oil guide channel communicating with the oil injection channel is provided in the stator slot.

3. The stator core according to claim 2, characterized in that The stator tooth has an oil guide protrusion protruding toward the inside of the stator slot. The outer contour of the oil guide protrusion is an arc-shaped surface. The first oil guide channel is formed between the oil guide protrusion, the stator tooth and the fixing portion.

4. The stator core according to claim 3, characterized in that The oil guiding protrusion has an arc-shaped outer contour and is bent toward the fixing portion.

5. The stator core according to any one of claims 2 or 3, characterized in that: The inner stator includes a first punching sheet, a second punching sheet, a third punching sheet, the second punching sheet and the first punching sheet which are stacked in sequence. The stator teeth of the two second punching sheets are provided with an oil guide notch on the side of the end facing away from the fixed portion. A second oil guide channel is formed between the oil guide notch and the stator teeth of the second punching sheet. The second oil guide channel is connected to the oil injection channel.

6. The stator core according to claim 5, characterized in that The two first punches are provided with a pressing portion on one side of the end away from the fixing portion; When the outer stator is sleeved on the outer side of the inner stator, in the axial direction of the inner stator, the pressed portions of the two first punching sheets are respectively pressed on opposite ends of the outer stator.

7. The stator core according to claim 1, characterized in that One of the two adjacent stator blocks is provided with a hook portion, and the other is provided with a slot portion matched with the hook portion.

8. The stator core according to claim 1, characterized in that The inner stator is one of a silicon steel part, an amorphous alloy part and a nanocrystalline alloy part; The outer stator is one of a silicon steel part, an amorphous alloy part and a nanocrystalline alloy part.

9. The stator core according to claim 1, characterized in that The stator tooth has a first arcuate surface and a second arcuate surface on one side close to two adjacent stator slots, respectively. The first arcuate surface and the second arcuate surface are used to guide coil winding.

10. A motor, characterized in that: The motor comprises: The stator core according to any one of claims 1 to 9.

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