Stator core, stator assembly and motor

Abstract

The embodiment of the utility model discloses a stator core, a stator assembly and a motor, and relates to the technical field of motor stators. The stator core comprises a stator yoke, stator teeth and a supporting part. The stator yoke is in a closed ring shape. The number of the stator teeth is multiple, the multiple stator teeth are all arranged in the circumferential direction of the inner side of the stator yoke, and a stator groove is formed between every two adjacent stator teeth in a matched mode. The supporting part is arranged in the outer circumferential direction, away from the stator teeth, of the stator yoke, and an oil inlet groove is formed in the supporting part and communicated with the stator groove. According to the stator iron core, the oil inlet grooves are formed in the supporting parts in the circumferential direction of the outer side of the stator yoke, so that cooling oil is divided into a plurality of flow paths, each flow path can quickly enter the stator iron core, the cooling oil is distributed more uniformly, the problem of uneven cooling is avoided, and the cooling effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor stators, in particular to a stator core, a stator assembly and a motor. Background Art

[0002] As the industry becomes more and more aware of the performance of oil-cooled motors, oil-cooled motors are increasingly used in new energy vehicles. However, most of the current technologies are spray cooling of the winding ends or cooling of the inner and outer diameters of the core, while the windings in the core slots where the heat is the most serious cannot be cooled.

[0003] In the related art, some motors are equipped with oil cooling devices for heat dissipation, which are formed by punching holes in the stator core punching sheets (i.e., the structural part of the stator yoke), stacking them to form flow channels, and supplying oil through the flow channels to complete cooling. However, the cooling oil in this structural form cannot be divided into multiple flow paths, and the flow path of the cooling oil is relatively single, which easily leads to uneven cooling, thereby reducing the cooling effect. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a stator core, a stator assembly and a motor. The stator core can divide the cooling oil into multiple flow paths by opening an oil inlet groove on the circumferential support portion on the outer side of the stator yoke, and each flow path can quickly enter the interior of the stator core, thereby more evenly distributing the cooling oil, avoiding the problem of uneven cooling and improving the cooling effect.

[0005] The utility model discloses a stator core, which comprises:

[0006] The stator yoke is in the form of a closed ring;

[0007] There are multiple stator teeth, and the multiple stator teeth are all arranged on the inner circumference of the stator yoke, and a stator slot is formed between two adjacent stator teeth;

[0008] The support part is arranged on the outer circumference of the stator yoke away from the stator teeth, and an oil inlet groove is arranged in the support part, and the oil inlet groove is communicated with the stator groove.

[0009] Furthermore, there are a plurality of support portions, and the plurality of support portions are evenly spaced and arranged on the outer circumference of the stator yoke.

[0010] Furthermore, the stator core includes a plurality of annular punchings arranged in an axially overlapping manner, and any annular punching includes a stator yoke, stator teeth and a support portion. Oil chamber holes for overlapping to form an oil flow channel are opened on the plurality of annular punchings. The number of the oil chamber holes is multiple, and the plurality of oil chamber holes all penetrate the axial direction of the annular punchings, and the stator slots are connected to the oil chamber holes; wherein, the oil chamber holes of at least two adjacent annular punchings are staggered in the circumferential direction and partially connected in the axial direction.

[0011] Furthermore, at least one annular punching sheet is provided with an oil guide hole, and two ends of the oil guide hole are respectively connected to the oil inlet groove and the oil cavity hole.

[0012] Furthermore, a plurality of annular punching sheets are located in the middle section of the stator core in the axial direction.

[0013] Furthermore, a sealing structure is included, which is arranged at the slot opening of the stator slot to cooperate with the slot bottom of the stator slot to seal the stator slot in the radial direction.

[0014] Further, the sealing structure includes insulating paper.

[0015] Furthermore, the sealing structure includes an injection molded part, and the injection molded part is integrally injection molded in the stator slot or the injection molded part is embedded in the stator slot.

[0016] Furthermore, it also includes a clamping structure, which is arranged at both ends of the stator yoke, and the clamping structure has a plurality of clamping chambers for fixing the enameled wire, the plurality of clamping chambers cooperate with and correspond one to one with the plurality of stator slots, and the projection of the clamping chamber in the radial direction completely falls into a partial area of ​​the projection of the stator slot in the radial direction.

[0017] Furthermore, the clamping structure includes a plurality of clamping units, and the plurality of clamping units are connected end to end to form an annular clamping structure, and any clamping unit has a plurality of clamping chambers.

[0018] Furthermore, the clamping structure is provided with a plurality of first oil guiding grooves for discharging oil, and the plurality of first oil guiding grooves are all connected along the axial direction of the clamping structure.

[0019] Furthermore, a second oil guide groove for oil discharge is provided on the side wall of the clamping chamber, and the second oil guide groove is recessed along the radial direction of the clamping chamber.

[0020] The utility model also discloses a stator assembly, which comprises the above-mentioned stator core, and the stator assembly also comprises enameled wire.

[0021] The utility model also discloses a motor, including the stator core as described above, and / or the stator assembly as described above.

[0022] The stator core provided by the utility model has the following beneficial effects, including but not limited to:

[0023] 1) The stator core can divide the cooling oil into multiple flow paths by opening an oil inlet groove on the circumferential support portion of the outer side of the stator yoke, and each flow path can quickly enter the interior of the stator core, thereby more evenly distributing the cooling oil, avoiding the problem of uneven cooling, and improving the cooling effect;

[0024] 2) In the axial middle section of the stator core, an oil cavity hole is provided on the annular punching sheet to realize a staggered slot structure, so that the cooling oil entering the core can flow into all the stator slots more smoothly and evenly, thereby improving the cooling effect of the winding;

[0025] 3) In the stator core, the sealing structure is provided to realize the oil blocking function, preventing the cooling oil in the stator slot from leaking into the motor air gap, so as to ensure that the cooling oil can fully cool the heating winding in the stator slot;

[0026] 4) The stator core is provided with a clamping structure at both ends of the stator yoke to ensure that the enameled wire can be centered in the stator slot, and the paint coating of the enameled wire does not come into direct contact with the stator core in the absence of insulating paper, so as to ensure the insulation of the enameled wire;

[0027] 5) The stator core is provided with a first oil guide groove and a second oil guide groove so that the cooling oil in the stator groove can flow out quickly, thereby forming a more complete closed loop, reducing flow resistance, and improving the final cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0029] Figure 1 A schematic diagram of the structure of a stator assembly provided in an embodiment of the utility model;

[0030] Figure 2 A cross-sectional view of a stator core provided in an embodiment of the utility model;

[0031] Figure 3 An exploded schematic diagram of a plurality of annular punching sheets provided in an embodiment of the utility model;

[0032] Figure 4 A schematic diagram of a sealing structure provided by an embodiment of the utility model;

[0033] Figure 5 A schematic diagram of the structure of the clamping structure provided by an embodiment of the utility model;

[0034] Figure 6 One of the structural schematic diagrams of the clamping unit provided in the embodiment of the utility model;

[0035] Figure 7 The second structural schematic diagram of the clamping unit provided in the embodiment of the utility model;

[0036] Figure 8Another structural schematic diagram of a stator assembly provided in an embodiment of the utility model;

[0037] Fig. 9 for Figure 8 A magnified schematic diagram of the middle A area;

[0038] Fig.10 A schematic diagram of a cooling oil flow path provided by an embodiment of the utility model;

[0039] Fig.11 Another structural schematic diagram of a stator assembly provided in an embodiment of the utility model.

[0040] Icon: 100- stator core;

[0041] 10-annular punching sheet; 101-stator yoke; 102-stator tooth; 103-supporting part; 104-stator slot; 105-oil inlet slot; 106-oil cavity hole; 107-oil guide hole;

[0042] 11- Sealing structure;

[0043] 12-clamping structure; 121-clamping unit; 1211-clamping chamber; 1212-fixed block; 1213-first oil guide groove; 1214-second oil guide groove;

[0044] 200- stator assembly; 21- enameled wire; 22- winding. DETAILED DESCRIPTION

[0045] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0046] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0047] Please refer to Figure 1 and Figure 2The utility model provides a stator core 100, which includes a stator yoke 101, stator teeth 102 and a support portion 103. The stator yoke 101 is in a closed ring shape. There are multiple stator teeth 102, and the multiple stator teeth 102 are all arranged on the inner circumference of the stator yoke 101, and a stator slot 104 is formed between two adjacent stator teeth 102. The support portion 103 is arranged on the outer circumference of the stator yoke 101 away from the stator teeth 102, and an oil inlet groove 105 is arranged in the support portion 103, and the oil inlet groove 105 is connected to the stator slot 104.

[0048] It is worth mentioning that the stator core 100 can divide the cooling oil into multiple flow paths by opening an oil inlet groove 105 on the circumferential support portion 103 on the outer side of the stator yoke 101. Each flow path can quickly enter the interior of the stator core 100, thereby more evenly distributing the cooling oil, avoiding the problem of uneven cooling and improving the cooling effect.

[0049] It is also worth explaining that, as shown in the figure, the support portion 103 in this embodiment refers to a support ear (whose shape is similar to an "ear") located on the outer circumference of the stator yoke 101. In the related art, its function is usually to support and install the stator assembly 200 as a whole. Here, the structural improvement of the oil inlet groove 105 of the support ear can be directly processed on the basis of existing related products, and then it can also play an effect of saving production costs, and there is no need to make too many improvements to the current production line. Depending on the specific implementation environment, the oil inlet groove 105 can also be set at other similar positions (that is, different from the position where the support ear is located). The illustration in this embodiment is only an example of the position of the support portion 103, and does not constitute a specific limitation on its position.

[0050] Please refer again Figure 1 and Figure 2 , the number of the support parts 103 is multiple, and the multiple support parts 103 are evenly spaced and arranged on the outer circumference of the stator yoke 101. It can be understood that through the multiple evenly spaced support parts 103, the force applied by the external load on the stator core 100 can be more evenly distributed, thereby reducing the stress concentration of the stator core 100 and reducing the risk of fatigue and damage caused by excessive loads in certain areas. In addition, oil inlet grooves 105 are provided in the multiple support parts 103, which can promote the flow of coolant together with the channel formed by the stator slots 104, thereby ensuring that the coolant can evenly enter each area (that is, the number of oil inlet grooves 105 is increased and the oil inlet grooves 105 are evenly distributed), effectively cooling various parts of the stator core 100.

[0051] In this embodiment, there are three support parts 103, which are arranged at 120° intervals on the outer circumference of the stator yoke 101. Depending on the specific implementation environment, the number of support parts 103 can also be 2, 4, etc., and this embodiment does not limit the specific number.

[0052] Please refer to Figure 3 The stator core 100 includes a plurality of annular punching sheets 10 which are arranged to overlap in the axial direction. Any annular punching sheet 10 includes a stator yoke 101, stator teeth 102 and a support portion 103. The plurality of annular punching sheets 10 are provided with oil chamber holes 106 for overlapping to form an oil flow channel. The number of the oil chamber holes 106 is multiple, and the plurality of oil chamber holes 106 are all through the axial direction of the annular punching sheets 10, and the stator slots 104 are connected to the oil chamber holes 106; wherein, the oil chamber holes 106 of at least two adjacent annular punching sheets 10 are staggered in the circumferential direction and partially connected in the axial direction. It can be understood that the axial direction in this embodiment refers to the direction of the central axis of the stator core 100 (such as Fig.11 ), radial direction refers to the direction perpendicular to the axial direction (such as Fig.11 The axial and radial directions mentioned in the following text will not be described in detail.

[0053] It is worth noting that the stator core 100 realizes a staggered slot structure by setting the oil cavity hole 106 on the annular punching sheet 10, thereby forming a zigzag oil flow channel (see Fig.10 As shown in the figure, the zigzag oil flow channel can better cover the circumference of the stator core 100, thereby ensuring more uniform heat dissipation of the winding 22, so that the cooling oil entering the core can flow more smoothly and evenly into all the stator slots 104, thereby improving the cooling effect of the winding 22.

[0054] Please refer again Figure 3 At least one annular punching piece 10 is also provided with an oil guide hole 107 , and two ends of the oil guide hole 107 are respectively connected to the oil inlet groove 105 and the oil cavity hole 106 .

[0055] It is worth noting that the setting of the oil guide hole 107 can directly guide the cooling oil from the oil inlet groove 105 to the oil cavity hole 106 arranged along the axial direction, so as to more effectively guide the coolant to the stator slot 104, cover the surface of the stator coil and the iron core, and improve the heat dissipation efficiency. At the same time, it can also make the cooling oil flow along a predetermined path, avoiding unnecessary vortices or liquid flow chaos, thereby ensuring that the cooling oil can effectively cover the surface of the entire stator iron core 100.

[0056] Please refer again Figure 1 and Figure 3 A plurality of annular punching sheets 10 are located in the middle section of the stator core 100 in the axial direction.

[0057] It is worth noting that arranging the annular punching sheet 10 in the axial middle section position can ensure that the cooling oil can evenly cover all parts of the upper and lower planes of the stator core 100, avoiding the problem of insufficient cooling or scattered distribution of hot spots caused by the annular punching sheet 10 being located at the top or bottom of the stator core 100, thereby improving the uniformity and comprehensiveness of the cooling effect. In addition, the axial middle section position is one of the hot spots inside the motor. Arranging the annular punching sheet 10 in this structural position can directly cool these hot spots, maximize the cooling efficiency, effectively reduce the temperature inside the motor, reduce thermal stress, and extend the service life of the motor. At the same time, its structural setting can not affect the layout and function of other components, so that the structure of the stator core 100 is more compact and lightweight.

[0058] Please refer to Figure 4 The stator core 100 further includes a sealing structure 11, which is disposed at the slot opening of the stator slot 104 to cooperate with the slot bottom of the stator slot 104 to seal the stator slot 104 in the radial direction.

[0059] It is worth noting that in the stator core 100 , the sealing structure 11 is provided to achieve the oil blocking function, thereby preventing the cooling oil in the stator slot 104 from leaking into the motor air gap, so as to ensure that the cooling oil can fully cool the heated winding 22 in the stator slot 104 .

[0060] In some implementations of this embodiment, the sealing structure 11 may be insulating paper. It is understood that the insulating paper as a sealing structure 11 has the flexibility and plasticity to effectively fill the notch of the stator slot 104 and cooperate with the bottom of the stator slot 104, thereby achieving sealing in the radial direction. Using insulating paper as the sealing structure 11 can simplify the manufacturing process of the stator core 100, reduce the need to use other sealing materials or add other sealing processes, reduce production costs and improve production efficiency.

[0061] In some other implementations of this embodiment, the sealing structure 11 can be an injection molded part, and the injection molded part can be integrally injection molded in the stator slot 104, or can be embedded in the stator slot 104. Compared with the insulating paper structure, the sealing structure 11 of the injection molded part can form a more complete and seamless connection with the stator core 100, which can effectively improve the stability and reliability of the sealing structure 11, and avoid the problem of reduced sealing performance due to loosening or falling off. In addition, the injection molded part is usually made of high temperature resistant and corrosion resistant materials, has good durability and anti-aging performance, and can ensure that the sealing structure 11 will not be damaged or degraded due to temperature changes, the action of chemical media or other external factors during long-term use, thereby extending the service life of the sealing structure 11.

[0062] Please refer to Figure 5 , Figure 8 and Fig. 9 The stator core 100 further includes a clamping structure 12, which is disposed at both ends of the stator yoke 101 (such as Fig.11 As shown), the clamping structure 12 has a plurality of clamping chambers 1211 for fixing the enameled wire 21, the plurality of clamping chambers 1211 cooperate with the plurality of stator slots 104 and correspond one to one, and the projection of the clamping chamber 1211 in the radial direction completely falls into a partial area of ​​the projection of the stator slot 104 in the radial direction.

[0063] It is worth noting that the projection of the clamping chamber 1211 in the radial direction completely falls within a partial area of ​​the projection of the stator slot 104 in the radial direction, that is, the open slot covers the entire projection of the clamping chamber 1211, indicating that the size (area) of the open slot is larger than the size (area) of the clamping chamber 1211. Therefore, by providing the clamping structure 12 at both ends of the stator yoke 101, it can be ensured that the enameled wire 21 is always in the center of the stator slot 104, and the paint of the enameled wire 21 does not come into direct contact with the stator core 100 in the absence of insulating paper, so as to ensure the insulation of the enameled wire 21.

[0064] Please refer to Figure 6 and Figure 7 The clamping structure 12 includes a plurality of clamping units 121 , and the plurality of clamping units 121 are connected end to end to form a ring-shaped clamping structure 12 , and any clamping unit 121 has a plurality of clamping chambers 1211 .

[0065] It is worth noting that there are 8 clamping units 121 in this embodiment, and the curvature of each clamping unit 121 itself is 45°, which is spliced ​​together by connecting end to end to form a clamping structure 12. This structural setting can evenly distribute the clamping force to ensure that the clamped parts are evenly supported and fixed. At the same time, since the clamping units 121 can be connected end to end to form a ring structure, the number of clamping units 121 can be flexibly increased or decreased according to actual needs to adapt to clamped parts of different sizes or shapes, thereby improving the flexibility and scalability of the system. When a clamping unit 121 fails or is damaged, other clamping units 121 can still maintain the clamping function, reducing the impact of single-point failures and improving overall reliability and stability. Depending on the specific implementation environment, the number of clamping units 121 can also be 12, and the curvature of each clamping unit 121 itself is 30°, etc. This embodiment does not constitute a limitation on its specific number and structural form. In addition, in some special implementation environments, an integrally formed clamping structure 12 can also be used, which has better integrity and more structural stability.

[0066] Please refer again Figure 6and Figure 7 The clamping structure 12 is provided with a plurality of first oil guide grooves 1213 for oil discharge, and the plurality of first oil guide grooves 1213 are all through the axial direction of the clamping structure 12. It is understood that, as shown in the figure, the cross section of the first oil guide groove 1213 is circular, and in some other embodiments, the cross section of the first oil guide groove 1213 may also be square, fan-shaped, etc. In the stator core 100, by providing the first oil guide groove 1213 and the second oil guide groove 1214, the cooling oil in the stator slot 104 can flow out quickly, forming a more complete closed loop, reducing the flow resistance, and improving the final cooling effect.

[0067] The clamping unit 121 provided in this embodiment further includes a fixed block 1212, which can be clamped in the stator slot 104 (such as Figure 1 As shown), to achieve the installation of the clamping unit 121.

[0068] The embodiment of the utility model further discloses a stator assembly 200, comprising the above-mentioned stator core 100 and enameled wire 21, having all the beneficial effects thereof.

[0069] The embodiment of the utility model further discloses a motor, comprising the stator core 100 as described above, and / or the stator assembly 200 as described above.

[0070] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

[0071] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more specific details or by other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0072] References throughout the specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. In addition, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described herein and shown may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0073] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0074] In addition, unless otherwise explicitly indicated, any marking arrows in the drawings should be regarded as exemplary only and not limiting. In addition, unless otherwise indicated, the term "or" used herein is generally intended to mean "and / or". In the case where the term is not clear because it is anticipated that the ability to separate or combine is provided, the combination of components or steps will also be regarded as indicated.

[0075] As used in the description herein and throughout the claims that follow, "a", "an", and "the" include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of "in" includes "in" and "on" unless otherwise indicated.

[0076] The above description of the illustrated embodiments of the present invention (including the contents in the abstract of the specification) is not intended to be an exhaustive list or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention as will be recognized and understood by those skilled in the art. As noted, these modifications may be made to the present invention in accordance with the above description of the embodiments of the present invention, and these modifications will be within the spirit and scope of the present invention.

[0077] Systems and methods have been generally described herein as details that are helpful for understanding the present invention. In addition, various specific details have been given to provide an overall understanding of the embodiments of the present invention. However, those skilled in the relevant art will recognize that the embodiments of the present invention can be practiced without one or more specific details, or practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusion with various aspects of the embodiments of the present invention.

Claims

1. A stator core, characterized in that: include: The stator yoke is in the form of a closed ring; There are multiple stator teeth, and the multiple stator teeth are all arranged on the inner circumference of the stator yoke, and a stator slot is formed between two adjacent stator teeth; The support portion is arranged on the outer circumferential direction of the stator yoke away from the stator teeth, and an oil inlet groove is arranged in the support portion, and the oil inlet groove is communicated with the stator groove.

2. The stator core according to claim 1, characterized in that: There are multiple support parts, and the multiple support parts are evenly spaced and arranged on the outer circumference of the stator yoke.

3. The stator core according to claim 1, characterized in that: The stator core includes a plurality of annular punchings arranged in an axially stacked manner, any of the annular punchings includes the stator yoke, the stator teeth and the support portion, and a plurality of the annular punchings are provided with oil chamber holes for stacking to form an oil flow channel. The number of the oil chamber holes is multiple, and the plurality of oil chamber holes are all through the axial direction of the annular punchings, and the stator slots are connected to the oil chamber holes; wherein, the oil chamber holes of at least two adjacent annular punchings are staggered in the circumferential direction and partially connected in the axial direction.

4. The stator core according to claim 3, characterized in that: At least one of the annular punching sheets is also provided with an oil guide hole, and two ends of the oil guide hole are respectively connected with the oil inlet groove and the oil cavity hole.

5. The stator core according to claim 3, characterized in that: The plurality of annular punching sheets are located in the middle section of the stator core in the axial direction.

6. The stator core according to claim 1, characterized in that: It also includes a sealing structure, which is arranged at the slot opening of the stator slot to cooperate with the slot bottom of the stator slot to seal the stator slot in the radial direction.

7. The stator core according to claim 6, characterized in that: The sealing structure includes insulating paper.

8. The stator core according to claim 6, characterized in that: The sealing structure includes an injection molded part, and the injection molded part is integrally injection molded in the stator slot or the injection molded part is embedded in the stator slot.

9. The stator core according to claim 1, characterized in that: It also includes a clamping structure, which is arranged at both ends of the stator yoke and has a plurality of clamping chambers for fixing the enameled wire. The plurality of clamping chambers cooperate with and correspond to the plurality of stator slots. The projection of the clamping chamber in the radial direction completely falls into a partial area of ​​the projection of the stator slot in the radial direction.

10. The stator core according to claim 9, characterized in that: The clamping structure comprises a plurality of clamping units, and the plurality of clamping units are connected end to end to enclose the ring-shaped clamping structure, and any of the clamping units has a plurality of the clamping chambers.

11. The stator core according to claim 9, characterized in that: The clamping structure is provided with a plurality of first oil guiding grooves for oil discharge, and the plurality of first oil guiding grooves are all connected along the axial direction of the clamping structure.

12. The stator core according to claim 9 or 11, characterized in that: A second oil guide groove for oil discharge is formed on the side wall of the clamping chamber, and the second oil guide groove is recessed along the radial direction of the clamping chamber.

13. A stator assembly, comprising the stator core according to any one of claims 1 to 12, characterized in that: The stator assembly also includes enameled wires.

14. A motor, characterized in that: It comprises the stator core according to any one of claims 1 to 12, and / or the stator assembly according to claim 13.

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