Electric machine and stator assembly thereof

Abstract

The application provides an electric machine and a stator assembly thereof. The stator assembly comprises a stator core, an insulation piece, a multi-turn coil and a plurality of connecting layers. A plurality of stator slots are formed on an inner ring wall of the stator core. The insulation piece has a plurality of insulation units. The insulation piece is arranged on the inner ring of the stator core. The plurality of insulation units are arranged in the plurality of stator slots. An accommodation space is defined in each insulation unit. At least a part of the multi-turn coil is arranged in the accommodation space. The multi-turn coil is arranged in sequence and at intervals in a first direction. The plurality of connecting layers are arranged in the accommodation space. The plurality of connecting layers are arranged on the multi-turn coil at intervals in the first direction. The connecting layers are used to connect the coil and the insulation unit and to connect the plurality of coils. The coil and the insulation unit are arranged at intervals in a second direction to form a cooling liquid channel. In the stator assembly of the application, the connecting layers are arranged on the coil. After a melting process, the connecting layers can fix the coil and facilitate the formation of an oil channel to achieve oil cooling of the coil.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a motor and its stator assembly. Background Technology

[0002] Currently, the stator slot oil direct cooling solution involves either foaming insulating paper to fix the flat wires, or injection molding the insulation layer inside the stator slots and fixing the windings with drip-painted enamel. However, these solutions cannot accurately create cooling oil channels within the stator slots, and therefore require further improvement. Utility Model Content

[0003] This application provides an electric motor and its stator assembly, wherein the stator assembly has a connecting layer between coils and between coils and insulation units, so as to fix the coils and insulation units by means of the connecting layer, and can accurately form cooling oil channels in the stator slots.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] In a first aspect, this application provides a stator assembly for an electric motor, comprising: a stator core having a plurality of stator slots on its inner ring wall; an insulating member having a plurality of insulating units located in the plurality of stator slots, and each insulating unit defining a receiving space; a multi-turn coil having at least a portion of the multi-turn coil located in the receiving space, the multi-turn coil being arranged sequentially at intervals along a first direction; and a plurality of connecting layers disposed in the receiving space and spaced along the first direction on the multi-turn coil for connecting the coil to the insulating unit and for connecting the plurality of coils, the coil and the insulating unit being spaced apart in a second direction to form a coolant channel, wherein the second direction intersects the first direction; or, a plurality of connecting layers disposed on both sides of the coil in the second direction, each connecting layer being used to connect the insulating unit to the plurality of coils, wherein in the first direction, the insulating unit and the coil, as well as between two adjacent coils, form a coolant channel, wherein the second direction intersects the first direction.

[0006] As an optional implementation, each stator slot has a depth direction extending radially along the stator core and a width direction extending circumferentially along the stator core; the first direction is set as the depth direction and the second direction is set as the width direction.

[0007] As an alternative implementation, the coil has a square cross-section, with each turn of the coil having two adjacent sides extending along a first direction and a second direction, respectively.

[0008] As an alternative implementation, the connecting layer is disposed on both sides of the coil extending in the first direction.

[0009] As an alternative implementation, the connecting layer is disposed on both sides of the coil extending along the second direction.

[0010] As an alternative implementation, multiple connecting layers are connected in the depth direction of the stator slot.

[0011] As an alternative implementation, the connecting layer is formed by any one or more combinations of adhesives, resins, and foaming agents.

[0012] As an alternative implementation, the thickness of the insulating unit is 0.2 mm to 1 mm.

[0013] As an optional implementation, the thickness of the connecting layer is 0.1 mm to 0.5 mm.

[0014] Secondly, this application provides an electric motor including a stator assembly as described above.

[0015] Since the connecting layer of the stator assembly of this application can be pre-arranged on the coil, a molten layer can be added at a specific position of the coil according to the design requirements. In this way, on the one hand, after the melting process is carried out, the fixed position and the unfixed part between the coil and the insulation unit can be accurately controlled, improving the fixing effect and saving fixing materials; on the other hand, oil channels can be precisely designed between the coil and the insulation unit to realize oil cooling of the coil. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram showing the installation relationship between the stator core and the insulating components in a stator assembly according to an embodiment of this application;

[0018] Figure 2 This is an exploded view of the stator core and insulation components in a stator assembly according to an embodiment of this application;

[0019] Figure 3 This is a cross-sectional view showing the installation relationship between the stator core and the insulating components in a stator assembly according to an embodiment of this application;

[0020] Figure 4 The curing process state of a stator assembly according to an embodiment of this application. Figure 1 ;

[0021] Figure 5The curing process state of a stator assembly according to an embodiment of this application. Figure 2 .

[0022] Explanation of reference numerals in the attached figures:

[0023] 100, Stator core; 110, Stator slot; 200, Insulating component; 210, Insulating unit; 212, Accommodating space; 214, Fitting part; 216, Sealing part; 300, Coil; 310, Molten layer; 400, Connecting layer; 500, Coolant channel. Detailed Implementation

[0024] In existing technologies, the stator slot direct oil cooling scheme involves using foamed insulating paper to fix the flat wire, or injection molding the insulation layer inside the stator slot and using dripping paint to fix the winding. However, these schemes cannot accurately form cooling oil channels.

[0025] To overcome the shortcomings of the prior art, this application provides a stator assembly for an electric motor. Since the connecting layer can be pre-arranged on the coil, a molten layer can be added at a specific position of the coil according to the design requirements. In this way, on the one hand, after the melting process, the fixed position and the unfixed part between the coil and the insulation unit can be accurately controlled, improving the fixing effect and saving fixing materials; on the other hand, an oil channel can be precisely designed between the coil and the insulation unit to realize oil cooling of the coil.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] See Figures 1 to 5 This application provides a stator assembly for an electric motor, which may include a stator core 100, an insulator 200, and a multi-turn coil 300. The stator core 100 has a plurality of stator slots 110 formed on its inner ring wall. The insulator 200 has a plurality of insulating units 210, which are disposed within the inner ring of the stator core 100, such that the insulating units 210 are located within the plurality of stator slots 110, and each insulating unit 210 defines a receiving space 212. At least a portion of each turn of the coil 300 is located within a stator slot 110.

[0028] See Figures 1 to 3In some exemplary embodiments, the stator core 100 is generally cylindrical and annular, and the inner ring of the stator core 100 is used to arrange components such as the rotor of the motor. A plurality of stator slots 110 are provided circumferentially on the inner ring wall of the stator core 100, each stator slot 110 extending radially and axially along the stator core 100, and each stator slot 110 is open at both ends in the axial direction.

[0029] See Figures 1 to 3 The insulating component 200 is made of insulating material (such as insulating paper, plastic, rubber, etc.). The insulating component 200 can be formed in the inner ring of the stator core 100 by injection molding. After injection molding, the insulating component 200 is cylindrical and ring-shaped. The solid part of the insulating component 200 forms multiple insulating units 210 along the circumferential direction. The multiple insulating units 210 are formed one-to-one in the multiple stator slots 110.

[0030] See Figure 4 and Figure 5 Furthermore, each insulation unit 210 has a fitting portion 214 that fits against the inner wall of the stator slot 110 and a blocking portion 216 that blocks the opening of the stator slot 110, wherein the fitting portion 214 and the blocking portion 216 enclose and form a receiving space 212 of the insulation unit 210.

[0031] See Figure 4 and Figure 5 Each coil 300 can be wound in two of the receiving spaces 212. During winding, a portion of the multi-turn coil 300 is located in one of the stator slots 110. Specifically, a coil 300 can pass through an opening at one end of the axial direction of one stator slot 110 into another stator slot 110, that is, a coil 300 is wound in both stator slots 110, and the multi-turn coil 300 can be arranged sequentially along the radial direction of the stator slots 110 in both stator slots 110.

[0032] In this embodiment, the coil 300 is disposed within the receiving space 212 formed by the insulating member 200. In this way, the insulating member 200 can physically isolate the stator core 100 and the coil 300, prevent abnormal current conduction (such as short circuit or leakage), and ensure that the motor operates stably for a long time under rated conditions.

[0033] See Figure 4 In some embodiments, the multi-turn coils 300 are arranged sequentially at intervals along a first direction. The stator assembly may also include a plurality of connecting layers 400 disposed in the receiving space and spaced apart on the multi-turn coils 300 along the first direction for connecting the coils 300 and the insulating unit 210 and for connecting the plurality of coils 300. The coils 300 and the insulating unit 210 are spaced apart in a second direction to form a coolant channel 500, wherein the second direction intersects the first direction.

[0034] In this embodiment, the multi-turn coils 300 are arranged sequentially at intervals along a first direction, and multiple connecting layers 400 are disposed at intervals on the multi-turn coils 300 along the first direction. That is, in the first direction, the first connecting layer 400 can be disposed between the first turn coil 300 and the inner wall of the insulating unit 210 to connect the first turn coil 300 and the insulating unit 210; the last connecting layer 400 is disposed between the last turn coil 300 and the insulating unit 210 to connect the last turn coil 300 and the insulating unit 210; and the remaining intermediate connecting layers 400 can be disposed between two adjacent turn coils 300 to connect the two adjacent turn coils 300. With this design, the multiple connecting layers 400 can fix the multi-turn coils 300 internally and fix the multi-turn coils 300 to the insulating unit 210.

[0035] Furthermore, since the multi-turn coils 300 are arranged sequentially at intervals along the first direction, and multiple connecting layers 400 are disposed at intervals on the multi-turn coils 300 along the first direction, there is no need to provide connecting layers 400 in the second direction that intersects with the first direction. Thus, when the coils 300 and the insulating units 210 are disposed at intervals in the second direction, the coils 300 and the insulating units 210 form a coolant channel 500 in the second direction, so as to realize the cooling of the coils 300 by introducing coolant (e.g., oil).

[0036] In some exemplary embodiments, the surface of the coil 300 is provided with a molten layer 310, and a connecting layer 400 is formed between two molten layers 310 and / or between the molten layer 310 and the insulating unit 210 by melting.

[0037] With this configuration, after the coil 300 is wound in the receiving space 212, a melting process can be performed on the coil 300 or the entire stator assembly, such that: the molten layers 310 of two adjacent coils 300 form a connecting layer 400 to achieve solidification between the two coils 300; or the molten layer 310 on the coil 300 forms a connecting layer 400 with the contact portion 214 and / or the sealing portion 216 of the insulation unit 210 to achieve solidification between the coil 300 and the insulation unit 210; or the molten layer 310 on one coil 300, the insulation unit 210, and the molten layer 310 on another coil 300 simultaneously form a connecting layer 400 to achieve solidification between one coil 300 and another coil 300 and the insulation unit 210.

[0038] Furthermore, the insulating component 200 is formed entirely of materials such as polyethylene, polypropylene, and polyvinyl chloride within the inner ring of the stator core 100. A molten layer 310, formed of any one or more combinations of adhesive, resin, and foaming agent, is pre-formed on the surface of the coil 300 facing the insulating unit 210 (adhesive portion 214 and / or sealing portion 216) and on the side of adjacent coils 300 that is close to each other.

[0039] After the coil 300 is wound into the receiving space 212 of the insulating unit 210, the molten layer 310 can be melted by heating. During the melting process, the molecules inside the solid material of the molten layer 310 overcome the interaction forces, change from an ordered arrangement to a disordered flow state, and expand appropriately, combining with the nearby insulating unit 210 and / or the molten layer 310. After cooling, the molecules of the molten layer 310 reform into an ordered arrangement, and are fixed in position by the interaction forces, thus achieving a fixed connection with the insulating unit 210 and / or the molten layer 310.

[0040] In this embodiment, since the molten layer 310 can be pre-coated on the coil 300 to form the connecting layer 400, on the one hand, after the melting process, the fixed position and the unfixed part between the coil 300 and the insulation unit 210 can be accurately controlled, improving the fixing effect and saving fixing materials; on the other hand, a coolant channel 500 can be precisely designed between the coil 300 and the insulation unit 210.

[0041] See Figure 5 In some embodiments, the multi-turn coils 300 are arranged sequentially at intervals along a first direction. The stator assembly may also include a plurality of connecting layers 400 disposed on both sides of the coils 300 in a second direction. Each connecting layer 400 is used to connect the insulating unit 210 to the plurality of coils 300. In the first direction, a coolant passage 500 is formed between the insulating unit 210 and the coils 300, as well as between two adjacent coils 300, wherein the second direction intersects the first direction.

[0042] In this embodiment, the multi-turn coils 300 are arranged sequentially at intervals along the first direction, and multiple connecting layers 400 are disposed on both sides of the second direction. That is, in the second direction, the connecting layers 400 can be disposed between the multi-turn coils 300 and the inner wall of the insulating unit 210 to connect the multi-turn coils 300 and the insulating unit 210. With this design, the multiple connecting layers 400 can fix the multi-turn coils 300 to the insulating unit 210.

[0043] Furthermore, since the multi-turn coils 300 are arranged at intervals along the first direction, the connecting layer 400 can be disposed between the multi-turn coils 300 and the inner wall of the insulating unit 210. Therefore, in the first direction that intersects with the second direction, there is no need to provide the connecting layer 400. In this way, when the coils 300 are arranged at intervals along the first direction, a coolant channel 500 can be formed between the coils 300 and the insulating unit 210 and between two adjacent coils 300, so as to realize the cooling of the coils 300 by introducing coolant (e.g., oil).

[0044] In some exemplary embodiments, the coil 300 has molten layers 310 on both sides of its second direction. After the coil 300 is wound in the receiving space 212, a melting process can be performed on the coil 300 or the entire stator assembly, such that the molten layers 310 on the coil 300 melt with the inner wall of the insulating unit 210 to form a connecting layer 400, thereby achieving solidification between the coil 300 and the insulating unit 210.

[0045] In this embodiment, since the molten layer 310 can be pre-coated on the coil 300 to form the connecting layer 400, on the one hand, after the melting process, the fixed position and the unfixed part between the coil 300 and the insulation unit 210 can be accurately controlled, improving the fixing effect and saving fixing materials; on the other hand, a coolant channel 500 can be precisely designed between the coil 300 and the insulation unit 210.

[0046] In some embodiments, each stator slot 110 has a depth direction extending radially along the stator core 100 and a width direction extending circumferentially along the stator core. The first direction is set as the depth direction, and the second direction is set as the width direction.

[0047] In other words, the multi-turn coil 300 is arranged sequentially at intervals along the radial direction of the stator core 100.

[0048] See Figure 4 When multiple connecting layers 400 are spaced apart on the multi-turn coil 300 along the first direction, that is, multiple connecting layers 400 are spaced apart on the multi-turn coil 300 along the radial direction of the stator core 100.

[0049] During manufacturing, a molten layer 310 is provided on the radial surface of the coil 300 facing the stator core 100, and a connecting layer 400 is formed between two molten layers 310 and / or between the molten layer 310 and the insulating unit 210 by melting. After melting, coolant channels 500 can be formed on both sides of the stator core 100 along the circumferential direction of the multiple coils 300.

[0050] See Figure 5When multiple connecting layers 400 are disposed on both sides of the coil 300 in the second direction, that is, multiple connecting layers 400 are disposed on the multi-turn coil 300 in the circumferential direction along the stator core 100.

[0051] During manufacturing, a molten layer 310 is provided on the circumferential surface of the coil 300 facing the stator core 100, and a connecting layer 400 is formed between the molten layer 310 and the insulating unit 210 by melting. After melting, multiple coolant channels 500 can be formed in the radial direction of the multiple coils 300 on the stator core 100.

[0052] In some embodiments, the coil 300 has a square cross-section, and the two adjacent sides of each turn of the coil 300 extend along a first direction and a second direction, respectively.

[0053] In some exemplary embodiments, the coil 300 may be a flat wire with a square cross-section, with the shorter side of each coil 300 extending along the depth direction of the stator slot 110 and the longer side extending along the width direction of the stator slot 110; and in each receiving space 212, the multiple coils 300 are arranged sequentially along the depth direction of the stator slot 110.

[0054] See Figure 4 Furthermore, the molten layer 310 is disposed on the two longer sides of the coil 300.

[0055] When multiple connecting layers 400 are spaced apart on the multi-turn coil 300 along a first direction, that is, when multiple connecting layers 400 are spaced apart radially along the stator core 100 on the multi-turn coil 300, since the longer side of the coil 300 extends in the width direction of the stator slot 110, and the multi-turn coil 300 is arranged sequentially along the depth direction of the stator slot 110, the molten layer 310 on the innermost and outermost coil 300, located near the insulating unit 210, can be melted and solidified with the insulating unit 210 by heating to form a connecting layer 400. The molten layer 310 on the side away from the insulating unit 210 can be melted and solidified with the molten layer 310 on the adjacent coil 300 by heating to form a connecting layer 400. For the multiple coils 300 in the middle, the molten layers 310 of two adjacent coils 300 are melted and solidified by heating.

[0056] In this embodiment, both the outermost coil 300 and the innermost coil 300 are solidified with the insulation unit 210. All coils 300 are solidified in pairs. This fixing method makes the fixing between each coil 300 and between the coil 300 and the insulation unit 210 more stable, which is beneficial to forming an integral part with the stator core 100 and optimizing the improvement in noise, vibration and harshness (NVH).

[0057] Furthermore, in this embodiment, since the molten layer 310 is disposed on the two longer sides of the coil 300, the longer side of the coil 300 extends in the width direction of the stator slot 110, and the multi-turn coil 300 is arranged sequentially along the depth direction of the stator slot 110, that is, the shorter side of the multi-turn coil 300 may not be connected to the insulation unit 210. In this way, space can be reserved as a coolant channel 500, and the cooling oil entering the space can contact the coil 300 to realize oil cooling of the coil 300.

[0058] See Figure 5 In some embodiments, the molten layer 310 is disposed on the two shorter sides of the coil 300.

[0059] When multiple connecting layers 400 are disposed on both sides of the coil 300 in the second direction, that is, when multiple connecting layers 400 are disposed circumferentially on the multi-turn coil 300 along the stator core 100, since the shorter side of the coil 300 extends along the depth direction of the stator slot 110, and the coil 300 is arranged sequentially along the depth direction of the stator slot 110, when the molten layer 310 is disposed on the two shorter sides of the coil 300, the molten layers 310 on both sides of the width direction of the coil 300 respectively melt and solidify with the adjacent insulating unit 210. After solidification, a space is reserved between two adjacent coils 300 as a coolant channel 500, and the cooling oil entering this space can contact the coil 300 to achieve oil cooling of the coil 300.

[0060] See Figure 5 Furthermore, in the depth direction of the stator slot 110, the connecting layers 400 formed by multiple molten layers 310 are connected together.

[0061] Because the gap between two adjacent coils 300 in the depth direction of the stator slot 110 is small, the gap between two adjacent molten layers 310 is also relatively small. When the molten layer 310 is heated and melted, the molten layer 310 can expand and grow appropriately to form a flowing intermediate medium. Under the action of surface tension, two adjacent connecting layers 400 can be connected, and finally a continuous connecting layer 400 is formed in the depth direction of the coil 300, which can further improve the stability of the coil 300.

[0062] In some embodiments, the molten layer 310 is formed from any one or more combinations of adhesives, resins, and foaming agents.

[0063] The molten layer 310 made of the above three materials can fill the gaps between coils 300 and between coils 300 and insulating components 200 through melting, flowing, and solidification processes. Furthermore, this material combination can achieve complete filling of complex gaps through controllable melt flow and stable solidification reaction, ensuring that the molten bonding layer 400 forms a gapless integral structure with the coils 300 and insulating components 200, balancing process efficiency and structural reliability.

[0064] In addition, in motors with direct oil cooling in stator slots 110, the molten layer 310 needs to be in contact with cooling oil (such as synthetic ester or polyether insulating oil) for a long time, and its oil resistance directly determines the life of the insulation system.

[0065] The resins in the above materials (such as epoxy resin, phenolic resin, and polyimide resin) have strong resistance to oil penetration, which can prevent oil molecules from penetrating into the interior of the molten layer 310 and causing a decrease in insulation performance.

[0066] The adhesive (such as modified polyurethane adhesive or epoxy adhesive) has strong adhesion to the surface of coil 300 (enameled layer) and insulation component 200 (such as polyimide insulating paper), which can form a physical barrier at the interface and prevent cooling oil from seeping in from the gap between coil 300 and molten layer 310 and the gap between molten layer 310 and insulation component 200.

[0067] The closed-cell structure formed by the foaming agent can reduce the overall porosity of the molten layer 310, reduce the penetration path of oil molecules, and reduce the density of the molten layer 310 after foaming.

[0068] In addition, foaming agents can be combined with adhesives and resins. The density of the molten layer 310 after foaming is reduced, but the matrix is ​​still an oil-resistant resin or adhesive, which can maintain oil resistance while ensuring lightweight.

[0069] In some embodiments, the thickness of the insulating unit 210 is 0.2 mm to 1 mm, such as 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, etc.

[0070] In this embodiment, setting the thickness of the insulating unit 210 within the above-mentioned range not only ensures that the insulating component 200 performs the basic insulating function, but also facilitates the adaptation to the melting and solidification process between the insulating unit 210 and the molten layer 310. When the thickness of the insulating unit 210 is within the above-mentioned range, the tiny pores or textures on its surface can form a mechanical interlock with the molten layer 310, enhancing the bonding strength between the two, and will not cause surface wrinkles due to excessive thinness.

[0071] In some embodiments, the thickness of the molten layer 310 is 0.1 mm to 0.5 mm, such as 0.1 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.

[0072] In this embodiment, the thickness of the molten layer 310 is set within the above-mentioned range so that the viscosity of the molten material can be adjusted by temperature to a state suitable for filling, which can penetrate into tiny gaps without being too thin and causing loss, thus making it difficult to control the solidification position.

[0073] In some embodiments, the thickness of the connecting layer 400 is 0.5 mm to 1.5 mm, such as 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, etc.

[0074] This application also provides an electric motor, which may include the stator assembly in any of the above embodiments. Since the coil 300 is disposed within the insulating unit 210 of the insulating member 200, and a molten layer 310 is provided on the surface of the coil 300, and the two molten layers 310 and / or the molten layer 310 and the insulating unit 210 are connected by a molten bonding layer 400, on the one hand, after the melting process, the fixed position and unfixed portion between the coil 300 and the insulating unit 210 can be precisely controlled, improving the fixing effect and saving fixing materials; on the other hand, a coolant channel 500 can be precisely designed between the coil 300 and the insulating unit 210 to achieve oil cooling of the coil 300.

[0075] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0076] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "one" or "" can also be understood to convey either singular or plural usage.

[0077] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0078] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of devices in use or operation other than those shown in the figures. Devices may have other orientations, and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A stator assembly of an electric machine, characterized in that include: A stator core, wherein a plurality of stator slots are provided on the inner ring wall of the stator core; An insulating component having a plurality of insulating units located in a plurality of stator slots, and each insulating unit defining a receiving space; A multi-turn coil, at least a portion of which is located within the receiving space, wherein the multi-turn coil is arranged at intervals along a first direction; and, Multiple connecting layers are disposed in the receiving space, and the multiple connecting layers are spaced apart along the first direction on multiple turns of the coil for connecting the coil and the insulating unit and for connecting multiple coils. The coil and the insulating unit are spaced apart in a second direction to form a coolant channel, wherein the second direction intersects the first direction; or, Multiple connecting layers are disposed on both sides of the coil in a second direction. Each connecting layer is used to connect the insulating unit to the multiple coils. In the first direction, a coolant channel is formed between two adjacent coils. The second direction intersects the first direction.

2. The stator assembly according to claim 1, characterized in that, Each of the stator slots has a depth direction extending radially along the stator core and a width direction extending circumferentially along the stator core; The first direction is set as the depth direction, and the second direction is set as the width direction.

3. The stator assembly according to claim 2, characterized in that, The coil has a square cross-section, and the two adjacent sides of each turn of the coil extend along the first direction and the second direction, respectively.

4. The stator assembly according to claim 3, characterized in that, The connecting layer is disposed on both sides of the coil extending along the first direction.

5. The stator assembly according to claim 3, characterized in that, The connecting layer is disposed on both sides of the coil extending along the second direction.

6. The stator assembly according to claim 5, characterized in that, In the depth direction of the stator slot, multiple connecting layers are connected to each other.

7. The stator assembly according to any one of claims 1 to 6, characterized in that, The connecting layer is formed by any one or more of adhesives, resins, and foaming agents.

8. The stator assembly according to any one of claims 1 to 6, characterized in that, The thickness of the insulating unit is 0.2 mm to 1 mm.

9. The stator assembly according to any one of claims 1 to 6, characterized in that, The thickness of the connecting layer is 0.1 mm to 0.5 mm.

10. An electric machine characterized by Includes the stator assembly according to any one of claims 1 to 9.

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