Stator and motor

Abstract

The invention provides a stator and a motor. The stator comprises an iron core, a winding and insulation paper. The iron core is provided with a wire slot, a jet hole and a medium flow channel; the jet hole is provided with a first inlet end and a first outlet end; the first outlet end is positioned on the end surface of the iron core; the medium flow channel is provided with a plurality of second outlet ends; each wire slot is communicated with at least one first inlet end and at least one second outlet end; the winding is partially arranged in the wire slot; the insulation paper is partially arranged in the groove and between the winding and the iron core; a hollow structure is formed on the insulation paper, and the hollow structure is arranged in the wire duct and corresponds to the first inlet end and the second outlet end correspondingly. The stator is applied to the motor, can reduce the loss of the motor, and improves the peak performance and operation reliability of the motor.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a stator and a motor. Background Technology

[0002] The development trend of drive motors used in new energy vehicles is to improve motor efficiency and reduce losses. Motor losses mainly include stator losses, rotor losses, and mechanical losses. These losses not only waste energy and reduce the driving range of new energy vehicles, but also generate heat, which in turn affects the peak performance and operational reliability of the motor.

[0003] For the stator, one of the main sources of heat is the windings, and the stator slots have the highest temperature during actual motor operation. The mainstream method for cooling the windings in existing technologies is to use oil spray rings. Cooling oil sprayed from these rings cools the portion of the windings outside the stator slots. However, this cooling solution has a complex assembly process and cannot cool the portion of the windings inside the stator slots, resulting in poor cooling performance. Summary of the Invention

[0004] The purpose of this invention is to provide a stator and motor that aims to cool the inside of the stator slots and improve the cooling effect.

[0005] To achieve the above objectives, the present invention provides a stator comprising:

[0006] An iron core having grooves, injection holes, and medium channels formed thereon; each injection hole has a first inlet end and a first outlet end, the first outlet end being located on the end face of the iron core; the medium channels have multiple second outlet ends; each groove is correspondingly disposed with at least one first inlet end and at least one second outlet end and is interconnected with each other;

[0007] The winding is partially disposed within the slot; and,

[0008] Insulating paper is partially disposed within the wire groove and located between the winding and the iron core; a hollow structure is formed on the insulating paper, the hollow structure is located within the wire groove, and is disposed corresponding to and connected to the corresponding first inlet end and second outlet end.

[0009] Optionally, the insulating paper includes a first region, a second region, a third region, and a fourth region, wherein the first region and the third region are opposite to each other in the depth direction of the groove, the first region is disposed at the groove opening of the groove, the third region is disposed at the groove bottom of the groove, and the second region and the fourth region are opposite to each other in the circumferential direction of the stator.

[0010] The hollow structure is located on at least one of the second region, the third region, and the fourth region.

[0011] Optionally, the second region is provided with a first sub-cutout structure, and the fourth region is provided with a second sub-cutout structure;

[0012] The hollow structure includes a first sub-hollow structure and a second sub-hollow structure.

[0013] Optionally, the insulating paper includes a first segment and at least one second segment, each second segment being connected to the first segment at one axial end of the stator, and the first segment having the perforated structure.

[0014] The first segment includes a first sub-segment and two second sub-segments, with the two second sub-segments respectively connected to the first sub-segment at both axial ends of the stator;

[0015] In the depth direction of the groove, the maximum size of the portion of the third region located at the first sub-segment is greater than the size of the portion of the third region located at the second sub-segment.

[0016] Optionally, the iron core includes a yoke and teeth, the teeth being disposed on the inner periphery of the yoke and spaced apart along the circumferential direction of the yoke, and the groove being formed between two adjacent teeth;

[0017] The surface of the teeth adjacent to the second region facing the groove is provided with a first inlet end and a second outlet end corresponding to the first sub-hollow structure; and,

[0018] The surface of the toothed portion near the fourth region facing the groove is provided with a first inlet end and a second outlet end corresponding to the second sub-hollow structure.

[0019] Optionally, the third region is provided with a third sub-hollow structure;

[0020] The hollow structure includes the third sub-hollow structure.

[0021] Optionally, the stator includes a yoke and teeth, the teeth being disposed on the inner periphery of the yoke and spaced apart along the circumferential direction of the yoke, and the groove being formed between two adjacent teeth;

[0022] The yoke has a first inlet end and a second outlet end on its surface facing the groove, which correspond to the third sub-hollow structure.

[0023] Optionally, the insulating paper is at least partially bonded to the iron core and the winding, so that the iron core and the winding remain relatively stationary.

[0024] Optionally, the insulating paper is also configured to seal the portion of the groove located on the end face of the iron core between the winding and the iron core.

[0025] Optionally, the core has a first end face and a second end face that are opposite each other in its axial direction;

[0026] The insulating paper is expandable foamed insulating paper, and the hollow structure has a first edge line and a second edge line opposite to each other in the axial direction of the stator. The first edge line is adjacent to the first end face, and the distance from the first edge line to the first end face is greater than or equal to 2 mm; the second edge line is adjacent to the second end face, and the distance from the second edge line to the second end face is greater than or equal to 2 mm.

[0027] Optionally, the insulating paper is also configured to seal the opening of the groove.

[0028] Optionally, the groove is symmetrical about a reference plane, which passes through the axis of the stator;

[0029] The insulating paper is an expandable foam insulating paper and has a first region; the first region is disposed at the opening of the groove, the circumferential dimension of the first region in the stator is greater than the circumferential dimension of the opening of the groove in the stator, and the ratio of the distance from any edge line of the first region in the circumferential direction of the stator to the reference surface along the circumferential direction of the stator to the circumferential dimension of the groove in the stator is greater than or equal to 0.4.

[0030] Optionally, the stator includes a yoke and teeth, the teeth being disposed on the inner periphery of the yoke and spaced apart along the circumferential direction of the yoke, and the groove being formed between two adjacent teeth;

[0031] The outlet end of the injection hole is located on the end face of the yoke.

[0032] To achieve the above objectives, the present invention also provides an electric motor, including the stator as described above.

[0033] Compared with the prior art, the stator and motor of the present invention have the following advantages:

[0034] The aforementioned stator includes an iron core, windings, and insulating paper; the iron core is provided with slots, injection holes, and dielectric channels; each injection hole has a first inlet end and a first outlet end, the first outlet end being located on the end face of the iron core; the dielectric channels have multiple second outlet ends; each slot communicates with at least one first inlet end and at least one second outlet end; the windings are partially disposed within the slots; the insulating paper is partially disposed within the slots and located between the windings and the iron core; the insulating paper has a perforated structure formed on it, the perforated structure being located within the slots and corresponding to the respective first inlet end and second outlet end. The stator is used in a motor. During motor operation, a cooling medium is supplied to the medium flow channel. The cooling medium enters the portion of the winding groove located inside the insulating paper after passing through the second outlet end and the hollow structure, and directly contacts the portion of the winding located within the winding groove to cool that portion. Then, the cooling medium flows into the injection hole along the first inlet end and finally exits from the first outlet end to cool the portion of the winding located outside the winding groove. This cooling method improves the cooling efficiency of the stator, thereby reducing motor losses and improving the motor's peak performance and operational reliability. Furthermore, this arrangement does not increase the electromagnetic air gap of the stator. Attached Figure Description

[0035] The accompanying drawings are provided to better understand the invention and are not intended to unduly limit the scope of the invention. Wherein:

[0036] Figure 1 This is a schematic diagram of the stator structure provided by the present invention according to an embodiment. The part of the winding outside the slot is not shown in the figure, and the insulating paper and winding in one of the slots are omitted.

[0037] Figure 2 yes Figure 1 The diagram shows a partially enlarged view of the stator.

[0038] Figure 3 This is a schematic diagram of the structure of the insulating paper of the stator provided according to an embodiment of the present invention. In the diagram, the first sub-hole structure, the second sub-hole structure, and the third sub-hole structure are connected in sequence.

[0039] Figure 4 This is a partial cross-sectional view of a stator provided according to an embodiment of the present invention. In the figure, the first sub-hollow structure, the second sub-hollow structure, and the third sub-hollow structure are connected in sequence. The surface of the yoke facing the slot is provided with a first inlet end and a second outlet end, and the winding is omitted.

[0040] Figure 5This is a partial cross-sectional view of the stator provided by the present invention according to an embodiment. In the figure, the first sub-hollow structure, the second sub-hollow structure, and the third sub-hollow structure are connected in sequence. The surface of the tooth portion near the second region facing the wire groove is provided with a first inlet end and a second outlet end, and the winding is omitted.

[0041] Figure 6 This is a partial sectional view of the stator provided by the present invention according to an embodiment. Figure 6 The cutting surface and Figure 4 , Figure 5 The cutting surfaces are different;

[0042] Figure 7 This is a schematic diagram of the structure of the insulating paper of the stator provided according to an embodiment of the present invention. In the diagram, the first sub-hole structure, the second sub-hole structure, and the third sub-hole structure are isolated from each other.

[0043] Figure 8 This is a partial cross-sectional view of the stator provided by the present invention according to an embodiment. In the figure, the first sub-hollow structure, the second sub-hollow structure, and the third sub-hollow structure are isolated from each other.

[0044] Figure 9 This is a schematic diagram of the structure of the insulating paper of the stator provided according to an embodiment of the present invention. The diagram does not show the third-stage perforated structure.

[0045] Figure 10 This is a partial cross-sectional view of the stator provided according to an embodiment of the present invention. The stator does not have a third sub-hole structure and the winding is omitted.

[0046] Figure 11 This is a partial sectional view of the stator provided by the present invention according to an embodiment. Figure 11 The cutting surface and Figure 10 The cross-sections are different.

[0047] [The following are explanations of the reference numerals in the attached drawings]: 10-Stator, 11-First end face, 12-Second end face, 100-Core, 101-Slot, 1011-Opening, 102-Injection hole, 1021-First inlet end, 1022-First outlet end, 1031-Second outlet end, 110-Yoke, 120-Tooth, 200-Winding, 300-Insulating paper, 301-Hollow structure, 3011-First edge line, 3012-Second edge line, 302-First segment, 3021-First sub-segment, 3022-Second sub-segment, 303-Second segment, 310-First region, 320-Second region, 321-First sub-hollow structure, 330-Third region, 331-Third sub-hollow structure, 340-Fourth region, 341-Second sub-hollow region, 01-Reference plane. Detailed Implementation

[0048] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the actual number, shape, and size of components in the actual implementation. In the actual implementation, the type, quantity, and proportion of each component can be arbitrarily changed, and the component layout may also be more complex.

[0049] Furthermore, while each embodiment described below possesses one or more technical features, this does not imply that users of the present invention must simultaneously implement all technical features in any embodiment, or can only separately implement some or all technical features in different embodiments. In other words, provided it is feasible, those skilled in the art can, based on the disclosure of the present invention and depending on design specifications or implementation requirements, selectively implement some or all technical features in any embodiment, or selectively implement a combination of some or all technical features in multiple embodiments, thereby increasing the flexibility in implementing the present invention.

[0050] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “multiple” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “installed,” “connected,” and “linked” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be mechanical or electrical. Connections can be direct or indirect through an intermediate medium, and can be internal communication between two elements or an interaction between two elements. Relational terms such as “first,” “second,” etc., are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly specify the number of indicated technical features. It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0051] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly illustrate the objectives of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar parts.

[0052] Figure 1 This diagram shows a structural schematic of the stator 10 provided in an embodiment of the present invention. Figure 2 Show Figure 1 The stator 10 shown is a partially enlarged schematic diagram.

[0053] like Figure 1 and Figure 2 As shown, the stator 10 includes an iron core 100, a winding 200, and insulating paper 300. The iron core 100 has wire grooves 101 and injection holes 102 (e.g., ...). Figure 4 , Figure 6 , Figure 8 and Figure 11(as indicated in the figure) and a medium flow channel (not shown in the figure). The injection hole 102 has a first inlet end 1021 (as shown in the figure). Figure 4 , Figure 5 , Figure 10 (as indicated) and a first outlet end 1022, the first outlet end 1022 being located on the end face of the iron core 100. The medium flow channel has a plurality of second outlet ends 1031 (as shown in the diagram) and a first outlet end 1022, the first outlet end 1022 being located on the end face of the iron core 100. Figure 4 , Figure 5 , Figure 10 (As indicated). Each of the slots 101 communicates with at least one first inlet end 1021 and at least one second outlet end 1031. The winding 200 is partially disposed within the slot 101. The insulating paper 300 is partially disposed within the slot 101 and located between the winding 200 and the core 100. Figures 3 to 5 , Figure 6 , Figure 7 , Figure 8 , Figures 9 to 11 As shown, a hollow structure 301 is formed on the insulating paper 300. The hollow structure 301 is located in the wire groove 101 and is correspondingly arranged with the first inlet end 1021 and the second outlet end 1031.

[0054] The stator 10 is applied to the motor. During motor operation, a cooling medium is supplied to the medium flow channel in any suitable manner. The cooling medium then flows along the path of the second outlet end 1031 → the groove 101 → the hollow structure 301 → the first inlet end 1021 → the first outlet end 1022. During this process, the cooling medium contacts the portion of the winding 200 within the groove 101 at the hollow structure 301, achieving the effect of cooling the portion of the winding 200 located within the groove 101. The cooling medium flowing out from the first outlet end 1022 contacts the portion of the winding 200 outside the groove 101, achieving the effect of cooling the portion of the winding 200 located outside the groove 101. That is, the application of the stator 10 achieves the purpose of cooling the portion of the winding 200 located within the groove 101, effectively improving the cooling effect of the stator 10, thereby reducing the energy consumption of the motor, improving the peak performance and operational reliability of the motor. Furthermore, this arrangement does not increase the electromagnetic air gap.

[0055] The cooling medium is, for example, cooling oil. It is understood that the medium flow channel also has a second inlet end (not shown in the figure), which can be located at any suitable position on the outer surface of the iron core 100, such as on the outer circumferential surface of the iron core 100. The cooling medium enters the medium flow channel via the second inlet end.

[0056] Those skilled in the art will understand that the iron core 100 includes a yoke 110 and teeth 120. The yoke 110 has a circular annular structure. There are multiple teeth 120, which are disposed on the inner circumferential surface of the yoke 110 and spaced apart along the circumferential direction of the stator 10, such that a groove 101 is formed between two adjacent teeth 120. It should be understood that the circumferential direction of the stator 10 is essentially the circumferential direction of the yoke 110.

[0057] The end face of the core 100 includes the end face of the yoke 110 and the end face of the toothed portion 120. The first outlet end 1022 is located at any suitable position on the end face of the core 100, but in a preferred embodiment, the first outlet 1022 is located on the end face of the yoke 110. This is because when the portion of the winding 200 outside the slot 101 is projected onto the end face of the core 100 along the axial direction of the stator 10, the projected area of ​​the winding 200 on the end face of the yoke 110 is larger than the projected area on the end face of the toothed portion 120. That is, by placing the first outlet end 1022 on the surface of the yoke 110, the cooling effect on the portion of the winding 200 outside the slot 101 can be improved.

[0058] The two axial end faces of the stator 10 are respectively referred to as the first end face 11 and the second end face 12. In practice, a portion of the winding 200 protrudes from the first end face 11 and another portion protrudes from the second end face 12. In a preferred embodiment, the second outlet end 1031 is located at the middle of the iron core 100 in the axial direction, and each of the wire grooves 101 communicates with at least two injection holes 102. A portion of the injection holes 102 have their first inlet end 1021 adjacent to the first end face 11 and their first outlet end 1022 located on the first end face 11, while another portion of the injection holes 102 have their first inlet end 1021 adjacent to the second end face 12 and their first outlet end 1022 located on the second end face 12. Thus, the cooling medium flowing into the groove 101 from the second outlet end 1031 forms two parts. One part of the cooling medium flows to the first inlet end 1021 near the first end face 11 and is ejected from the first outlet end 1022 located on the first end face 11 to cool the portion of the winding 200 that protrudes from the first end face 11. The other part of the cooling medium flows to the first inlet end 1021 near the second end face 12 and is ejected from the first outlet end 1022 located on the second end face 12 to cool the portion of the winding 200 that protrudes from the second end face 12.

[0059] It should be noted that the specific location of "the middle part of the iron core 100 in the axial direction" is between the first end face 11 and the second end face 12. It can be at the 1 / 2 position in the axial direction of the iron core 100, or it can be deviated from the 1 / 2 position in the axial direction of the iron core 100 and be closer to the first end face 11 or closer to the second end face 12.

[0060] The groove 101 has an opening 1011 at one end near the axis of the yoke 110, which is referred to as the groove opening of the groove 101. The end of the groove 101 near the yoke 110 can be referred to as the groove bottom of the groove 101. In addition, the "depth direction of the groove 101" mentioned later refers to the extension direction of the tooth 120.

[0061] In embodiments of the present invention, such as Figures 1 to 6 , Figure 7 , Figure 8 , Figures 9 to 11 As shown, the insulating paper 300 includes a first region 310, a second region 320, a third region 330, and a fourth region 340. The first region 310 and the third region 330 are opposite each other in the depth direction of the groove 101, with the first region 310 located at the opening of the groove 101 and the third region 330 located at the bottom of the groove 101. The second region 320 and the fourth region 340 are opposite each other in the circumferential direction of the stator 10.

[0062] The hollow structure 301 is disposed on at least one of the second region 320, the third region 330, and the fourth region 340. For example, it may be entirely disposed on the second region 320, or entirely disposed on the third region 330, or entirely disposed on the fourth region 340, or partially disposed on the second region 320 and partially disposed on the third region 330, or partially disposed on the second region 320 and partially disposed on the fourth region 340, or partially disposed on the third region 330 and partially disposed on the fourth region 340, or partially disposed on the second region 320, partially disposed on the third region 330, and partially disposed on the fourth region 340.

[0063] The positions of the first inlet end 1021 and the second outlet end 1031 are determined according to the position of the hollow structure 301.

[0064] For example, in such Figures 3 to 6 The first embodiment shown and as follows Figure 7 and Figure 8In the second embodiment shown, a portion of the hollow structure 301 is disposed on the second region 320, a portion on the fourth region 340, and a portion on the third region 330. For ease of description, the portion of the hollow structure 301 located on the second region 320 is referred to as the first sub-hollow structure 321, the portion of the hollow structure 301 located on the fourth region 340 is referred to as the second sub-hollow structure 341, and the portion of the hollow structure 301 located on the third region 330 is referred to as the third sub-hollow structure 331. In the first embodiment, viewed in the arrangement direction of the first region 310, the second region 320, the third region 330, and the fourth region 340, the first sub-hollow structure 321 extends to the junction of the second region 320 and the third region 330; the second sub-hollow structure 341 extends to the junction of the fourth region 340 and the third region 330; and the third sub-hollow structure 331 extends to both the intersection of the third region 330 and the second region 320 and the intersection of the third region 330 and the fourth region 340, thereby making the first sub-hollow structure 321, the second sub-hollow structure 341, and the third sub-hollow structure 331 sequentially connected. In the second embodiment, the first sub-hollow structure 321, the second sub-hollow structure 341, and the third sub-hollow structure 331 are not interconnected.

[0065] In the first and second embodiments, the first inlet end 1021 and the second outlet end 1031 can be provided on the surface of the yoke 110 facing the groove 101, and the first inlet end 1021 and the second outlet end 1031 provided on the yoke 110 correspond to the third sub-hollow structure 331 (e.g., Figure 4 (As shown). In this case, the cooling medium can flow into the groove 101 via the second outlet end 1031 on the yoke 110.

[0066] For ease of description, the cooling medium flowing into the groove 101 via the second outlet end 1031 on the yoke 110 is referred to as the first cooling medium, such as... Figure 4As shown, the first cooling medium contacts the winding 200 at the third sub-hollow structure 331. A portion of the first cooling medium flows along the axial direction of the stator 10 towards the first end face 11 within the third sub-hollow region 331, flowing into the first inlet end 1021 near the first end face 11, and then exiting from the first outlet end 1022 located on the first end face 11; another portion of the first cooling medium flows along the axial direction of the stator 10 towards the second end face 12 within the third sub-hollow structure 331, flowing into the first inlet end 1021 near the second end face 12, and then exiting from the first outlet end 1022 located on the second end face 12 (e.g., Figure 4 (As indicated by the purple arrow in the image).

[0067] In the first and second embodiments, the first inlet end 1021 and the second outlet end 1031 can be provided on the surface of the toothed portion 120 adjacent to the second region 320 facing the groove 101, and the first inlet end 1021 and the second outlet end 1031 provided on the surface of the toothed portion 120 adjacent to the second region 320 facing the groove 101 correspond to the first sub-hollow structure 321 (e.g., Figure 5 (As shown). In this case, the cooling medium can enter the groove 101 via the second outlet end 1031 on the tooth 120 adjacent to the second region 320.

[0068] For ease of description, the cooling medium entering the groove 101 via the second outlet end 1031 on the tooth 120 adjacent to the second region 320 is referred to as the second cooling medium. The second cooling medium contacts the winding 200 at the first sub-perforated structure 321. Furthermore, a portion of the second cooling medium flows along the axial direction of the stator 10 towards the first end face 11 within the first sub-perforated structure 321 and flows into the first inlet end 1021 adjacent to the first end face 11, and is then ejected from the first outlet end 1022 located on the first end face 11; another portion of the second cooling medium flows along the axial direction of the stator 10 towards the second end face 12 within the first sub-perforated structure 321 and flows into the first inlet end 1021 adjacent to the second end face 12 and is ejected from the first outlet end 1022 located on the second end face 12.

[0069] In the first and second embodiments, a first inlet end 1021 and a second outlet end 1031 may be provided on the surface of the toothed portion 120 adjacent to the fourth region 340 facing the wire groove 101, and the first inlet end 1021 and the second outlet end 1031 on the surface of the toothed portion 120 adjacent to the fourth region 340 facing the wire groove 101 correspond to the second sub-hollow structure 341. In this case, the cooling medium can enter the wire groove 101 via the second outlet end 1031 on the toothed portion 120 adjacent to the fourth region 340.

[0070] For ease of description, the cooling medium entering the slot 101 via the second outlet end 1031 on the tooth 120 adjacent to the fourth region 340 is referred to as the third cooling medium. The third cooling medium comes into contact with the winding 200 at the second sub-perforated structure 341. A portion of the third cooling medium flows along the axial direction of the stator 10 towards the first end face 11 within the second sub-perforated structure 341 and flows into the first inlet end 1021 adjacent to the first end face 11, and is then ejected from the first outlet end 1022 located on the first end face 11; another portion of the second cooling medium flows along the axial direction of the stator 10 towards the second end face 12 within the second sub-perforated structure 341 and flows into the first inlet end 1021 adjacent to the second end face 12, and is then ejected from the first outlet end 1022 located on the second end face 12.

[0071] In other words, for the first and second embodiments, the first inlet end 1021 and the second outlet end 1031 corresponding to the respective sub-cutting mechanism can be provided on at least one of the surface of the yoke 110 facing the groove 101, the surface of the tooth 120 adjacent to the second region 320 facing the groove 101, and the surface of the tooth 120 adjacent to the fourth region 340 facing the groove 101.For example, the first inlet end 1021 and the second outlet end 1031 corresponding to the third sub-hollow structure 331 are provided only on the surface of the yoke 110 facing the groove 101; or, the first inlet end 1021 and the second outlet end 1031 corresponding to the first sub-hollow structure 321 are provided only on the surface of the toothed portion 120 adjacent to the second region 320 facing the groove 101; or, the first inlet end 1021 and the second outlet end 1031 corresponding to the second sub-hollow structure 341 are provided only on the surface of the toothed portion 120 adjacent to the fourth region 340 facing the groove 101. 31; or, the first inlet end 1021 and the second outlet end 1031 corresponding to the third sub-hollow structure 331 are provided on the surface of the yoke 110 facing the groove 101, and the first inlet end 1021 and the second outlet end 1031 corresponding to the first sub-hollow structure 321 are provided on the surface of the toothed portion 120 adjacent to the second region 320 facing the groove 101; or, the first inlet end 1021 and the second outlet end 1031 corresponding to the third sub-hollow structure 331 are provided on the surface of the yoke 110 facing the groove 101, and the first inlet end 1021 and the second outlet end 1031 corresponding to the first sub-hollow structure 321 are provided on the surface of the toothed portion 120 adjacent to the fourth region 320. The toothed portion 120 of region 340 has a first inlet end 1021 and a second outlet end 1031 corresponding to the second sub-hollow structure 341 on its surface facing the groove 101; or, the toothed portion 120 of region 320 has a first inlet end 1021 and a second outlet end 1031 corresponding to the first sub-hollow structure 321 on its surface facing the groove 101, and the toothed portion 120 of region 340 has a first inlet end 1021 and a second outlet end 1031 corresponding to the second sub-hollow structure 341 on its surface facing the groove 101, and the toothed portion 120 of region 340 has a first inlet end 1021 and a second outlet end 1031 corresponding to the second sub-hollow structure 341 on its surface facing the groove 101. 1; Alternatively, the first inlet end 1021 and the second outlet end 1031 corresponding to the third sub-hollow structure 331 are provided on the surface of the yoke 110 facing the groove 101, the first inlet end 1021 and the second outlet end 1031 corresponding to the first sub-hollow structure 321 are provided on the surface of the toothed portion 120 near the second region 320 facing the groove 101, and the first inlet end 1021 and the second outlet end 1031 corresponding to the second sub-hollow structure 341 are provided on the surface of the toothed portion 120 near the fourth region 340 facing the groove 101.

[0072] For example, in such Figures 9 to 11In the third embodiment shown, the hollow structure 301 includes two parts, one part located on the second region 320 and the other part located on the fourth region 340. That is, the hollow structure 301 includes a first sub-hollow structure 321 and a second sub-hollow structure 341. In this case, a first inlet end 1021 and a second outlet end 1031 corresponding to the first sub-hollow structure 321 can be provided on the surface of the toothed portion 120 adjacent to the second region 320 facing the groove 101, and / or a first inlet end 1021 and a second outlet end 1031 corresponding to the second sub-hollow structure 341 can be provided on the surface of the toothed portion 120 adjacent to the fourth region 340 facing the groove 101.

[0073] It is worth noting that, compared to the first embodiment, the insulating paper 300 in the second embodiment has better rigidity, making it easier to insert into the wire groove 101 and less prone to bending and wrinkling. Compared to the second embodiment, the insulating paper 300 in the third embodiment has even better rigidity.

[0074] like Figure 3 , Figure 7 , Figure 9 As shown, along the axial direction of the stator 10, the insulating paper 300 can be divided into three segments: a first segment 302 and two second segments 303. The two second segments 303 are respectively disposed at both ends of the first segment 302 along the axial direction of the stator 10. The perforated structure 301 is disposed on the first segment 302 and can be aligned with the first segment 302 along the axial direction of the stator 10. In other words, the perforated structure 301 is located in the middle region of the insulating paper 300 along the axial direction of the stator 10.

[0075] like Figure 7 and Figure 9 As shown, the first segment 302 is divided into three sub-segments, namely the first sub-segment 3021 and two second sub-segments 3022, and the two second sub-segments 3022 are respectively connected to the first sub-segment 3021 at both ends of the axial direction of the stator 10.

[0076] In the second embodiment, when the distance from the edge line of the third sub-hole structure 331 near the second region 320 to the intersection of the third region 330 and the second region 320 is greater than zero, and / or, the distance from the edge line of the third sub-hole structure 331 near the fourth region 340 to the intersection of the third region 330 and the fourth region 340 is greater than zero, preferably, the dimension L1 of the portion of the third region 330 located on the second sub-segment 3022 in the depth direction of the groove 101 is smaller than the maximum dimension L2 of the portion of the third region 330 located on the first sub-segment 3021 in the depth direction of the groove 101 (e.g., ...). Figure 7 (As shown). This further increases the rigidity of the insulating paper 300, preventing it from bending when inserted into the wire groove 101.

[0077] Similarly, in the third embodiment, preferably, the portion of the third region 330 located on the second sub-segment 3022 has a dimension in the depth direction of the groove 101 that is smaller than the maximum dimension of the portion of the third region 330 located on the first sub-segment 3021 in the depth direction of the groove 101.

[0078] In the second and third embodiments, if the distance from the edge line of the first sub-perforated structure 321 near the third region 330 to the intersection of the second region 320 and the third region 330 is greater than zero, it is preferable that the portion of the second region 320 located on the side of the first sub-perforated structure 321 near the third region 330 at the second sub-segment 3022 has a dimension in the depth direction of the groove 101 smaller than the maximum dimension of the portion of the second region 320 located on the side of the first sub-perforated structure 321 near the third region 330 at the first sub-segment 3021 in the depth direction of the groove 101, so as to improve the stiffness of the insulating paper 300.

[0079] Furthermore, in the second and third embodiments, if the distance from the edge line of the second sub-perforated structure 341 near the third region 330 to the intersection of the fourth region 340 and the third region 330 is greater than zero, it is preferable that the portion of the fourth region 340 located on the side of the second sub-perforated structure 341 near the third region 330, located at the second sub-segment 3022, has a dimension in the depth direction of the groove 101 smaller than the maximum dimension of the portion of the fourth region 340 located on the side of the second sub-perforated structure 341 near the third region 330, located at the first sub-segment 3021, in the depth direction of the groove 101, thereby improving the stiffness of the insulating paper 300.

[0080] It should be noted that, when producing the insulating paper 300, the insulating paper 300 can be directly produced as a three-dimensional structure in which the first region 310 is opposite to the third region 330 and the second region 320 is opposite to the fourth region 340.

[0081] Alternatively, during the production of the insulating paper 300, the insulating paper 300 is made into a planar shape, and then, during the assembly of the iron core 100 and the insulating paper 300, the planar insulating paper 300 is folded to form a three-dimensional structure. In this case, the third region 330 of the insulating paper 300 includes two sub-regions, one of which is connected to the side of the second region 320 away from the first region 310, and the other sub-region is connected to the side of the fourth region 340 away from the first region 310. When folding the insulating paper 300, the two sub-regions can be joined together without overlapping (e.g., Figure 3 and Figure 7 (as shown), or the two said sub-regions partially overlap (as shown). Figure 9 (As shown).

[0082] In the stator 10, the iron core 100, the winding 200, and the insulating paper 300 should remain relatively stationary. In this embodiment of the invention, any suitable method can be used to keep the iron core 100 and the winding 200 relatively stationary.

[0083] In an optional example, the core 100, winding 200, and insulating paper 300 are kept relatively stationary by bonding the insulating paper 300 at least partially to the core 100 and winding 200. For example, the insulating paper 300 is expandable foamed insulating paper, and after the insulating paper 300 and winding 200 are both inserted into the slot 101, the insulating paper 300 is heated to foam and bond it to the core 100 and winding 200. Optionally, the two first segments 302 of the insulating paper 300 are bonded to the core 100 and winding 200.

[0084] like Figure 5 and Figure 10As shown, the hollow structure 301 has a first edge line 3011 and a second edge line 3012 that are axially opposite to each other on the stator 10, wherein the first edge line 3011 is adjacent to the first end face 11, and the second edge line 3012 is adjacent to the second end face 12. It should be understood that when the hollow structure 301 is aligned with the first segment 302 on the axial direction of the stator 10, the first edge line 3011 is part of the boundary line between the second segment 303 and the first segment 302 adjacent to the first end face 11, and the second edge line 3012 is part of the boundary line between the second segment 303 and the first segment 302 adjacent to the second end face 12.

[0085] In this embodiment of the invention, the portion of the end of the groove 101 located between the winding 200 and the core 100 in the axial direction of the core 100 can be sealed in any suitable manner to prevent the cooling medium entering the groove 101 from overflowing from the groove 101 at the end face of the core 100.

[0086] Optionally, the insulating paper 300 is used to seal the portion of the wire groove 101 located between the winding 200 and the iron core 100 at its axial end. Specifically, when the insulating paper 300 is foamed insulating paper, the distance L3 from the first edge line 3011 to the iron core 100 at the first end face 11 can be greater than or equal to 2 mm, and the distance L4 from the second edge line 3012 to the iron core 100 at the second end face 12 can be greater than or equal to 2 mm. Thus, after the insulating paper 300 is foamed, it can seal the portion of the wire groove 101 located between the winding 200 and the iron core 100 at its axial end.

[0087] It should be noted that when the hollow structure 301 includes multiple sub-hollow structures (here, the sub-hollow structures include at least one of the first sub-hollow structure 321, the second sub-hollow structure 341, and the third sub-hollow structure 331), each sub-hollow structure includes a first sub-edge line and a second sub-edge line opposite each other in the axial direction of the stator 10. The first sub-edge line is adjacent to the first end face 11, and the second sub-edge line is adjacent to the second end face 12. The first edge line 3011 includes the first sub-edge lines of all sub-hollow structures, and the second edge line 3012 includes the second sub-edge lines of all sub-hollow structures.

[0088] In addition, at both axial ends of the stator 10, the insulating paper 300 may protrude from the end face of the iron core 100.

[0089] In this embodiment of the invention, any suitable method can be used to seal the opening of the wire groove 101 to prevent the cooling medium entering the wire groove 101 from leaking from the opening of the wire groove 101.

[0090] When the insulating paper 300 is foamed insulating paper, the dimensions of the first region 310 of the insulating paper 300 in the circumferential direction of the iron core 100 can be reasonably set so that the first region 310 can seal the opening of the wire groove 101.

[0091] Specifically, such as Figure 1 As shown, the groove 101 is symmetrical about a reference plane 01, which is a plane passing through the axis of the stator 10. When the dimension L5 of the first region 310 in the circumferential direction of the stator 10 is greater than the dimension L6 of the groove opening in the circumferential direction of the stator 101, and the ratio of the distance L7 from any edge line of the first region 310 in the circumferential direction of the stator 10 to the reference plane 01 along the circumferential direction to the dimension L8 of the groove 101 in the circumferential direction of the stator 10 is greater than or equal to 0.4, the first region 310 can seal the groove opening of the groove 101 after the insulating paper 300 is heated and foamed.

[0092] Additionally, it should be noted that although the above description uses the example of the insulating paper 300 including two second segments 303, in practice, the number of second segments 303 can also be one. That is, the first segment 302 is connected to the second segment 303 at one end of the iron core 100 in the axial direction, and the second segment 303 is not provided at the other end.

[0093] A second objective of this invention is to provide an electric motor, which includes the aforementioned stator 10.

[0094] While the present invention has been disclosed above, it is not limited thereto. Those skilled in the art can make various modifications and variations to the present invention without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, the present invention also intends to include such modifications and variations.

Claims

1. A stator, characterized in that, include: An iron core having grooves, injection holes, and medium channels formed thereon; each injection hole has a first inlet end and a first outlet end, the first outlet end being located on the end face of the iron core; the medium channels have multiple second outlet ends; each groove is correspondingly disposed with at least one first inlet end and at least one second outlet end and is interconnected with each other; The winding is partially disposed within the slot; and, Insulating paper is partially disposed within the wire groove and located between the winding and the iron core; a hollow structure is formed on the insulating paper, the hollow structure is located within the wire groove, and is disposed corresponding to and connected to the corresponding first inlet end and second outlet end.

2. The stator according to claim 1, characterized in that, The insulating paper includes a first region, a second region, a third region, and a fourth region, wherein the first region and the third region are opposite to each other in the depth direction of the groove, the first region is located at the opening of the groove, the third region is located at the bottom of the groove, and the second region and the fourth region are opposite to each other in the circumferential direction of the stator. The hollow structure is located on at least one of the second region, the third region, and the fourth region.

3. The stator according to claim 2, characterized in that, The second region has a first sub-cutout structure, and the fourth region has a second sub-cutout structure; The hollow structure includes a first sub-hollow structure and a second sub-hollow structure.

4. The stator according to claim 3, characterized in that, The insulating paper includes a first segment and at least one second segment, each second segment being connected to one end of the first segment in the axial direction of the stator, and the first segment having the hollow structure. The first segment includes a first sub-segment and two second sub-segments, with the two second sub-segments respectively connected to the first sub-segment at both axial ends of the stator; In the depth direction of the groove, the maximum size of the portion of the third region located at the first sub-segment is greater than the size of the portion of the third region located at the second sub-segment.

5. The stator according to claim 3, characterized in that, The iron core includes a yoke and teeth. The teeth are located on the inner periphery of the yoke and are spaced apart along the circumferential direction of the yoke. A groove is formed between two adjacent teeth. The surface of the teeth adjacent to the second region facing the groove is provided with a first inlet end and a second outlet end corresponding to the first sub-hollow structure; and, The surface of the toothed portion near the fourth region facing the groove is provided with a first inlet end and a second outlet end corresponding to the second sub-hollow structure.

6. The stator according to claim 3, characterized in that, The third region is provided with a third sub-hollow structure; The hollow structure includes the third sub-hollow structure.

7. The stator according to claim 6, characterized in that, The stator includes a yoke and teeth. The teeth are located on the inner periphery of the yoke and are spaced apart along the circumferential direction of the yoke. A groove is formed between two adjacent teeth. The yoke has a first inlet end and a second outlet end on its surface facing the groove, which correspond to the third sub-hollow structure.

8. The stator according to claim 1, characterized in that, The insulating paper is at least partially bonded to the iron core and the winding, so that the iron core and the winding remain relatively stationary.

9. The stator according to claim 8, characterized in that, The insulating paper is also configured to seal the portion of the end of the wire groove located axially on the iron core between the winding and the iron core.

10. The stator according to claim 8, characterized in that, The iron core has a first end face and a second end face that are opposite each other in its axial direction; The insulating paper is expandable foamed insulating paper, and the hollow structure has a first edge line and a second edge line opposite to each other in the axial direction of the stator. The first edge line is close to the first end face, and the distance from the first edge line to the first end face is greater than or equal to 2 mm. The second edge line is adjacent to the second end face, and the distance from the second edge line to the second end face is greater than or equal to 2mm.

11. The stator according to claim 8, characterized in that, The insulating paper is also configured to seal the opening of the wire groove.

12. The stator according to claim 11, characterized in that, The groove is symmetrical about a reference plane, which passes through the axis of the stator; The insulating paper is an expandable foam insulating paper and has a first region; the first region is disposed at the opening of the groove, the circumferential dimension of the first region in the stator is greater than the circumferential dimension of the opening of the groove in the stator, and the ratio of the distance from any edge line of the first region in the circumferential direction of the stator to the reference surface along the circumferential direction of the stator to the circumferential dimension of the groove in the stator is greater than or equal to 0.

4.

13. The stator according to claim 1, characterized in that, The stator includes a yoke and teeth. The teeth are located on the inner periphery of the yoke and are spaced apart along the circumferential direction of the yoke. A groove is formed between two adjacent teeth. The outlet end of the injection hole is located on the end face of the yoke.

14. An electric motor, characterized in that, Includes the stator as described in any one of claims 1-13.

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