Stator assembly and flat wire motor

Abstract

The utility model provides a stator assembly and a flat wire motor, the stator assembly comprises an iron core, a plurality of flat wire grooves are uniformly distributed along the circumferential direction of the iron core, the openings of the flat wire grooves face the center of the iron core and penetrate through the inner circumferential surface of the iron core, a plurality of flat wires are sequentially arranged in the flat wire grooves along the radial direction of the iron core, and the flat wires are partially accommodated in the flat wire grooves; an insulating film used for isolating the inner wall of the flat wire groove from the flat wire is inserted into the flat wire groove, the insulating film comprises a resin insulating layer and a foaming layer capable of expanding when heated, and the resin insulating layer is located on the side, facing the flat wire, of the foaming layer so as to separate the foaming layer from the flat wire; the foaming layer can be heated to foam so as to fill gaps between the flat wires and the flat wire grooves, at least one side face of each flat wire is provided with an oil guide groove used for circulation of cooling liquid, and the oil guide grooves extend in the length direction of the flat wires.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and more specifically to a stator assembly and a flat wire motor. Background Art

[0002] In a flat wire motor, at least a portion of the flat copper wire (also known as flat wire) is inserted into the flat wire slots of the stator core. Multiple flat copper wires form a flat wire winding, which, combined with the core, forms the stator assembly. To dissipate heat from the stator assembly, conventional cooling channels are provided within the flat copper wires. A cooling medium flows through the cooling channels, directly contacting the heat source and dissipating heat from the flat copper wires.

[0003] In related technical solutions, insulating paper is applied to the exterior of the flat wire windings to insulate the core and flat wire. However, gaps exist between the insulating paper and the walls of the flat wire slots, as well as between the insulating paper and the flat wires. Furthermore, existing insulating paper is often made of fiber material. During the subsequent sealing process of dripping lacquer (typically resin) onto both ends of the flat wire windings, the capillary properties of the fiber material allow the insulating lacquer to easily penetrate the insulating paper and gaps into the cooling channels, thereby clogging the cooling channels with the lacquer and preventing the flow of the cooling medium. Furthermore, if foamed insulating paper is used, there is a risk of clogging the cooling channels due to the shedding of the foaming material during the foaming process or during use. Utility Model Content

[0004] The purpose of this application is to overcome or at least alleviate the deficiencies of the above-mentioned prior art and to provide a stator assembly and a flat wire motor to solve the problem that the gaps between the insulating paper used in the stator assembly are easily penetrated by insulating varnish, and the insulating varnish easily blocks the cooling channel.

[0005] According to a first aspect of the present application, a stator assembly is provided, comprising an iron core, with a plurality of flat wire slots evenly distributed along the circumference of the iron core, the openings of the flat wire slots facing the center of the iron core and penetrating the inner circumference of the iron core, a plurality of flat wires being arranged in sequence in the radial direction of the iron core in the flat wire slots, and the flat wires being partially accommodated in the flat wire slots; an insulating film for isolating the inner wall of the flat wire slot and the flat wires is inserted into the flat wire slots, the insulating film comprising a resin insulating layer and a foaming layer capable of thermal expansion, the resin insulating layer being located on the side of the foaming layer facing the flat wire to separate the foaming layer and the flat wire; the foaming layer being capable of thermal expansion to fill the gap between the flat wire and the flat wire slot, and each flat wire having at least one side provided with an oil guide groove for circulating cooling liquid, the oil guide groove extending along the length direction of the flat wire.

[0006] In at least one embodiment, the flat wires located in the same flat wire slot include at least one of a first type of flat wire, a second type of flat wire, and a third type of flat wire;

[0007] The first type of flat wire has an oil guide groove on one side, the second type of flat wire has an oil guide groove on two parallel sides, and the third type of flat wire has an oil guide groove on each side.

[0008] In at least one embodiment, when all flat wires in the same flat wire groove are first-type flat wires: at least one oil guide groove and the resin insulation layer are enclosed to form a first cooling channel, and / or at least one oil guide groove and the side surface of an adjacent flat wire are enclosed to form a first cooling channel.

[0009] In at least one embodiment, along the radial direction of the iron core, the openings of the oil guiding grooves of at least two adjacent flat wires face in opposite directions.

[0010] In at least one embodiment, when all flat wires in the same flat wire groove are second-type flat wires: one oil guide groove of at least one flat wire is enclosed by the resin insulation layer to form a first cooling channel, and another oil guide groove is enclosed by an oil guide groove of an adjacent flat wire to form a second cooling channel, and / or, both oil guide grooves of at least one flat wire are enclosed by the resin insulation layer to form two first cooling channels.

[0011] In at least one embodiment, when the flat wires in the same flat wire slot include at least two types of flat wires of the first, second, and third types, the flat wire with more oil guide grooves is closer to the center of the core.

[0012] In at least one embodiment, the corners of adjacent sides of the flat wire are rounded, and the adjacent rounded corners of adjacent flat wires and the insulating film enclose a rounded corner space; the opposite sides of two adjacent flat wires have a gap, which is used to connect the oil guide groove and the rounded corner space.

[0013] In at least one embodiment, the flat wire groove has a width direction perpendicular to the radial direction of the core, and the oil guide groove is located at the center of the flat wire along the width direction of the core.

[0014] In at least one embodiment, the resin insulation layer is one of a PI film, a PPS film, a PES film, a PEEK film, a PEI film, or a PTEF film.

[0015] According to a second aspect of the present application, a flat wire motor is provided, comprising a rotor assembly and the stator assembly of the first aspect, wherein the rotor assembly is embedded in the stator assembly.

[0016] The beneficial effects of one or more of the above technical solutions are:

[0017] In this solution, an insulating film is inserted into the flat wire trough to insulate the inner wall of the trough from the flat wires. The insulating film comprises a resin insulation layer and a thermally expandable foam layer. This arrangement utilizes the thermal expansion of the foam layer to fill the gaps between the insulating film and the inner wall of the trough, as well as between the insulating film and the sides of the flat wires. This prevents the insulating varnish dripping from the ends of the flat wire windings from flowing into the oil guide trough along these gaps, thereby preventing the insulating varnish from clogging the oil guide trough and affecting the flow of the coolant. Furthermore, by replacing insulating paper made of fiber material with a resin insulation layer, this application prevents the insulating varnish from entering the oil guide trough along the resin insulation layer.

[0018] Secondly, the resin insulation layer is located on the side of the foam layer facing the flat wire. This arrangement can use the resin insulation layer to separate the foam layer and the coolant at the oil guide groove, thereby preventing the coolant flow from impacting the foam layer and causing part of the foam layer material to fall off, thereby preventing the foam layer fragments from clogging the oil guide groove and affecting the flow of coolant.

[0019] Finally, the insulating film of this solution includes a resin insulating layer and a foaming layer. The foaming layer can be heated to foam and squeeze the side of the flat wire and the inner wall of the flat wire groove, thereby facilitating the stable installation of multiple flat wires in the flat wire groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of one of the structural foam layers in Example 1 of the present application when it is not foamed;

[0021] Figure 2 This is a schematic diagram of one of the structural foaming layers after foaming in Example 1 of the present application;

[0022] Figure 3 is a schematic cross-sectional view of the flat wire in Example 1 of the present application;

[0023] Figure 4 This is a schematic diagram of the unfoamed second structural foam layer in Example 1 of the present application;

[0024] Figure 5 This is a schematic diagram of the second structural foaming layer after foaming in Example 1 of the present application;

[0025] Figure 6 This is a schematic diagram of the unfoamed foam layer of the third structure in Example 1 of the present application;

[0026] Figure 7 This is a schematic diagram of the foaming layer of the third structure after foaming in Example 1 of the present application;

[0027] Figure 8 This is a schematic diagram of the fourth structural foam layer in Example 1 of the present application without foaming;

[0028] Figure 9This is a schematic diagram of the fourth structural foaming layer after foaming in Example 1 of the present application;

[0029] Figure 10 This is a schematic diagram of one of the structural foam layers in Example 2 of the present application when it is not foamed;

[0030] Figure 11 This is a schematic diagram of one of the structural foaming layers after foaming in Example 2 of the present application;

[0031] Figure 12 is a schematic cross-sectional view of the flat wire in Example 2 of the present application;

[0032] Figure 13 This is a schematic diagram of the unfoamed second structural foam layer in Example 2 of the present application;

[0033] Figure 14 This is a schematic diagram of the second structural foaming layer after foaming in Example 2 of the present application;

[0034] Figure 15 This is a schematic diagram of the unfoamed foam layer in Example 3 of the present application;

[0035] Figure 16 This is a schematic diagram of the foaming layer after foaming in Example 3 of the present application;

[0036] Figure 17 This is a schematic diagram of the unfoamed foamed layer in Example 4 of the present application;

[0037] Figure 18 This is a schematic diagram of the foaming layer after foaming in Example 4 of the present application;

[0038] Figure 19 It is a schematic cross-sectional view of the flat wire in Example 4 of the present application.

[0039] Reference numerals: 1, insulating film; 101, resin insulating layer; 102, foaming layer; 2, flat wire; 3, first cooling channel; 4, second cooling channel; 5, gap; 6, flat wire groove; 7, iron core; 8, oil guide groove; 9, void. DETAILED DESCRIPTION

[0040] The following describes exemplary embodiments of the present application with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible embodiments of the present application, nor to limit the scope of the present application.

[0041] The flat wire in this embodiment refers to a flat copper wire. In other embodiments, the flat wire can be made of other materials, as long as they meet the requirements. In this embodiment, for any flat wire slot, its length direction L coincides with the radial direction of the core; its width direction W is perpendicular to the length direction L and the axial direction of the core. The two sides of the flat wire slot along the width direction are its left and right sides.

[0042] Example 1

[0043] Reference Figure 1-Figure 2 , for one or more embodiments of the present application, a stator assembly is provided, comprising an iron core 7, with a plurality of flat wire slots 6 uniformly distributed along the circumference of the iron core 7, the openings of the flat wire slots 6 facing the center of the iron core 7 and penetrating the inner circumference of the iron core 7. A plurality of flat wires 2 are sequentially arranged in the flat wire slots 6 along the radial direction of the iron core 7, and the flat wires 2 are partially accommodated in the flat wire slots 6. An insulating film 1 is inserted into the flat wire slots 6 to insulate the inner wall of the flat wire slots 6 from the flat wires 2. The insulating film 1 includes a resin insulating layer 101 and a foaming layer 102 capable of thermal expansion. The resin insulating layer 101 is located on the side of the foaming layer 102 facing the flat wire 2 to separate the foaming layer 102 and the flat wire 2; the foaming layer 102 can foam when heated to fill the gap 5 between the flat wire 2 and the flat wire slots 6. Each flat wire 2 is provided with an oil guide groove 8 for circulating coolant on at least one side surface, and the oil guide groove 8 extends along the length direction of the flat wire 2.

[0044] Specifically, the main structure of the stator assembly is an annular iron core 7, and the extension direction of each flat wire slot 6 coincides with the radial direction of the iron core 7. The multiple flat wires 2 in the flat wire slot 6 are stacked in sequence along the radial direction of the iron core 7. At this time, adjacent flat wires 2 abut against each other through their own side surfaces. However, the side abutment between adjacent flat wires 2 is not sufficient to achieve a complete surface seal, and a certain gap 9 still exists between the abutting sides of adjacent flat wires 2. More specifically, Figure 1 In the flat wire slot 6 shown in FIG, four flat wires 2 are arranged. In other embodiments, the number of flat wires 2 in each flat wire slot 6 may also be five, six, or other numbers, which can be set by those skilled in the art according to needs.

[0045] In this embodiment, part of the structure of each flat wire 2 is inserted into the flat wire groove 6, and the other part extends outward from the flat wire groove 6 to form a crown end or a welding end (not shown in the figure). Therefore, the part of the flat wire 2 in the flat wire groove 6 is provided with an oil guide groove 8 to accommodate the coolant, while the part of the flat wire 2 outside the flat wire groove 6 is not provided with an oil guide groove 8 to avoid the oil guide groove 8 affecting the welding of the flat wire 2.

[0046] During use, the insulating film 1 is first placed within the flat wire slot 6. After the flat wires 2 are fully inserted into the slot 6, multiple flat wires 2 are combined into a flat wire winding, with the insulating film 1 surrounding the flat wire winding. At this point, gaps 5 are defined between the insulating film 1 and the sides of the flat wires 2 and the inner walls of the flat wire slot 6. After the stator assembly, consisting of the iron core 7 and flat wires 2, is simultaneously transferred to a heating device (e.g., a vacuum heating chamber), the entire stator assembly is heated, causing the foam layer 102 to expand. This expands the gap 5 between the flat wires 2 and the slot 6, completely securing the flat wires 2 within the slot 6. After the foam layer 102 has foamed, insulating varnish can be dripped onto both ends of the flat wire winding. Due to the insulating effect of the resin insulation layer 101, the varnish will not penetrate the insulating film 1 and flow into the oil guide groove 8, thereby preventing the varnish from clogging the oil guide groove 8.

[0047] It should be noted that, in this embodiment, the softening temperature of the resin insulating layer 101 is greater than the foaming temperature of the foaming layer 102. Therefore, when the foaming layer 102 is heated and expanded, the resin insulating layer 101 can be prevented from being damaged by heating.

[0048] In actual use, the flat wire motor experiences magnetic field distortion within it. Due to the air gap harmonic magnetic field, the flat wire 2 within the flat wire slots 6 can easily experience significant AC losses due to eddy currents. Furthermore, the closer the flat wire 2 is to the rotor (i.e., toward the center of the core 7), the greater the AC losses. In this embodiment, oil guide grooves 8 are provided on the sides of the flat wire 2. These grooves partially block the eddy current paths, thereby reducing AC losses and heat generation in the flat wire 2.

[0049] Specifically, oil guide groove 8 is a trapezoidal groove with a relatively large opening, which helps to increase the flow rate of the refrigerant. The size of oil guide groove 8 gradually decreases as it approaches the center of flat wire 2. In other configurations, oil guide groove 8 can be a square groove, a semicircular groove, a triangular groove, or other configurations, which can be configured by those skilled in the art.

[0050] See also Figure 3 The flat wire 2 of this embodiment is a first type flat wire, and one side of the first type flat wire is provided with an oil guide groove 8. Figure 1-Figure 2, this embodiment provides a stator assembly in one structural form: in this case, the oil guide groove 8 is located on the side of the flat wire 2 that is perpendicular to the radial direction of the iron core 7 and away from the center of the iron core 7. That is, the openings of all the oil guide grooves 8 face in a direction away from the center of the iron core 7. Preferably, the symmetrical center plane of the oil guide groove 8 passes through the center of the flat wire 2 to ensure the structural strength of the flat wire 2 and enable the oil guide groove 8 to better block the eddy current path. At this time, in a single flat wire slot 6, one oil guide groove 8 and the resin insulation layer 101 enclose a first cooling channel 3, and the remaining oil guide grooves 8 and the side surfaces of the adjacent flat wire 2 enclose a first cooling channel 3. The number of first cooling channels 3 is equal to the number of oil guide grooves 8.

[0051] In this embodiment, the corners of adjacent sides of the flat wires 2 are rounded, and the adjacent rounded corners of adjacent flat wires 2 and the insulating film 1 enclose a rounded space. A gap 9 is formed between the opposing sides of two adjacent flat wires 2, connecting the oil guide groove 8 with the rounded space. Coolant flowing through the gap 9 increases the contact area between the coolant and the flat wires 2, thereby improving the heat exchange efficiency of the motor. Furthermore, coolant can flow into the rounded space through the gaps between the flat wires 2, forming a cooling channel within the rounded space, further improving the heat exchange efficiency of the motor.

[0052] In this embodiment, resin insulation layer 101 is a PI film, a PPS film, a PES film, a PEEK film, a PEI film, or a PTFE film. This type of resin insulation layer 101 prevents degradation during contact with the coolant. In this embodiment, resin insulation layer 101 is oil-resistant and high-temperature resistant, being incompatible with coolants such as engine oil and transmission fluid. Furthermore, resin insulation layer 101 has a temperature resistance exceeding 200°C.

[0053] See also Figure 4-Figure 5 This embodiment also provides a second structural form of the stator assembly, in which the flat wires 2 in the flat wire slots of the second stator assembly are also the first type of flat wires. Specifically, Figure 4 The second stator assembly and Figure 1 Compared to the structure in the second embodiment, the difference lies in that the oil guide groove 8 is located on the side of the flat wire 2 perpendicular to the radial direction of the iron core 7 and near the center of the iron core 7. As mentioned above, during use of the stator assembly, eddy current losses are easily generated within the flat wire 2 and between adjacent flat wires 2. Specifically, these eddy current losses are primarily concentrated on the side of the flat wire 2 perpendicular to the radial direction of the iron core 7 and near the center of the iron core 7. The location of the oil guide groove 8 in the second stator assembly of this embodiment further enhances its effectiveness in reducing eddy currents in the flat wire 2.

[0054] See also Figure 6-Figure 7This embodiment also provides a third structural form of a stator assembly. In this third structural form, the flat wires 2 in the flat wire slots are also all first-class flat wires. Specifically, the oil guide grooves 8 are located on the side of the flat wire 2 that is not perpendicular to the radial direction of the iron core 7. In other words, the openings of the oil guide grooves 8 face left and right of the flat wire slot. More specifically, along the radial direction of the iron core 7, the openings of the oil guide grooves 8 of any two adjacent flat wires 2 face opposite directions. This arrangement allows the first cooling channels 3 in the flat wire slots to be staggered, which helps improve heat dissipation efficiency within the entire flat wire slot.

[0055] See also Figure 8-Figure 9 This embodiment also provides a stator assembly of a fourth structural form. In the fourth stator assembly, the flat wires 2 in the flat wire slots are also all first-class flat wires. Specifically, the oil guide groove 8 is provided on the side of the flat wire 2 that is not perpendicular to the radial direction of the iron core 7. That is, the opening direction of the oil guide groove 8 is on the side of the flat wire 2 that is parallel to the radial direction of the iron core 7. More specifically, in the same flat wire slot, the openings of multiple oil guide grooves 8 are oriented in the same direction. The openings of the oil guide grooves 8 in the same flat wire slot are all oriented in the same direction. Figure 8 In some other structural arrangements, although not shown in the figure, the openings of the oil guide groove 8 may also be oriented toward Figure 8 This arrangement can simplify the arrangement order of the flat wires 2 in the flat wire slots, facilitate the installation of the flat wires 2, and help improve the production efficiency of the stator assembly.

[0056] One or more embodiments of the present application further provide a flat wire motor, comprising a rotor assembly and the above-mentioned stator assembly, wherein the rotor assembly is embedded inside the stator assembly.

[0057] Example 2

[0058] This embodiment has the same structure and configuration as the embodiment 1, and also provides a stator assembly and a flat wire motor. The difference is that the flat wire 2 in the flat wire slot 6 in this embodiment is a second type flat wire. Figure 12 An oil guide groove 8 is provided on two mutually parallel side surfaces of the second type flat wire 2 , and the two oil guide grooves 8 are symmetrically arranged about the center of the flat wire 2 .

[0059] As a specific structural form of this embodiment, Figure 10-11A stator assembly is provided in which the flat wires 2 in the flat wire slots are all second-class flat wires. Specifically, an oil guide groove 8 is provided on each flat wire 2 on two radial side surfaces perpendicular to the iron core 7. At this time, the two flat wires 2 at the radial ends of the flat wire slot and the inner surface of the resin insulation layer 101 in the insulating film 1 respectively form a first cooling channel 3. Oil guide grooves 8 are provided on the sides where adjacent flat wires 2 abut each other, and the two oil guide grooves 8 together form the above-mentioned second cooling channel 4. The aperture of the second cooling channel 4 is larger than the aperture of the first cooling channel 3. In this arrangement, oil guide grooves 8 are provided on two radial side surfaces of the flat wire 2 perpendicular to the iron core 7, and the two oil guide grooves 8 together form a second cooling channel 4, which can increase the flow rate of the cooling oil and thereby improve the cooling effect of the cooling medium on the entire flat wire winding. In addition, this can further improve the effect of the oil guide grooves 8 on reducing eddy current losses in the flat wire 2.

[0060] As the second specific structural form of this embodiment, Figure 13-14 A stator assembly is also provided in which all flat wires 2 within the flat wire slots are second-class flat wires. Specifically, an oil guide groove 8 is provided on each of the two radial side surfaces of each flat wire 2 parallel to the iron core 7, with the openings of the oil guide grooves 8 oriented to the left and right of the flat wire slot. In this arrangement, the oil guide grooves 8 are not provided on the sides where adjacent flat wires 2 abut each other, thereby increasing the contact area between adjacent flat wires 2 and enhancing the stability of the stack of multiple flat wires 2 within the flat wire slots.

[0061] Example 3

[0062] The structural setting of this embodiment is basically the same as that of embodiment 1, and also provides a stator assembly and a flat wire motor. The difference is that in this embodiment, the flat wire 2 in the same flat wire slot includes at least two types of flat wires 2 of the first type flat wire, the second type flat wire and the third type flat wire.

[0063] As one of the specific structural forms, see Figure 15-16 The same flat wire slot includes two first-class flat wires and two second-class flat wires. The two first-class flat wires are located at the radial ends of the flat wire slot along the iron core 7, and the two second-class flat wires are located in the middle of the flat wire slot. In this case, the oil guide slots 8 are used in pairs, and two adjacent oil guide slots 8 are connected to form a second cooling channel 4. This arrangement prevents the oil guide slots 8 and even the second cooling channel 4 formed by the oil guide slots 8 from contacting the insulating film 1, reducing the probability of the cooling medium contacting the insulating film 1 and causing the insulating film 1 material to fall off and enter the oil guide slots 8. In addition, the cross-sectional area of the second cooling channel 4 in this arrangement is larger, which facilitates increasing the flow rate of the cooling medium in the flat wire slot and improving the cooling effect of the cooling medium on the flat wire 2.

[0064] More specifically, in this embodiment, the flat wires with more oil-conducting grooves are positioned closer to the center of the core. This arrangement reduces eddy current losses caused by this skin effect, as the flat wires are closer to the core center (i.e., closer to the rotor). Furthermore, the flat wires closer to the rotor generate more heat, which improves heat dissipation efficiency.

[0065] Example 4

[0066] The structural arrangement of this embodiment is basically the same as that of the first embodiment, and both provide a stator assembly and a flat wire motor. The difference is that the oil guide groove 8 in the flat wire 2 is arranged at a different position within the flat wire slot 6 in this embodiment.

[0067] As a specific structural form, see Figure 17-Figure 19 Oil guide grooves 8 are provided on each of the four side surfaces of the flat wire 2 (two of which are perpendicular to the radial direction of the iron core 7). The oil guide grooves 8 are located in the middle of each side surface of the flat wire 2. This arrangement increases the number of oil guide grooves 8 within the flat wire slot 6 and expands the diameter of the cooling channel, further improving heat exchange efficiency.

[0068] Of course, the present invention is not limited to the above embodiments. Those skilled in the art can make various combinations and modifications to the above embodiments of the present invention under the guidance of the present invention without departing from the scope of the present invention.

Claims

1. A stator assembly, comprising an iron core, with a plurality of flat wire slots uniformly distributed along the circumference of the iron core, the openings of the flat wire slots facing the center of the iron core and penetrating the inner circumference of the iron core, a plurality of flat wires sequentially arranged in the flat wire slots along the radial direction of the iron core, the flat wires partially accommodated in the flat wire slots; an insulating film is inserted into the flat wire slots to isolate the inner wall of the flat wire slots from the flat wires, characterized in that: The insulating film includes a resin insulating layer and a foaming layer that can expand when heated. The resin insulating layer is located on the side of the foaming layer facing the flat wire; the foaming layer can foam when heated to fill the gap between the flat wire and the flat wire groove. Each flat wire has at least one side provided with an oil guide groove for circulating coolant and extending along the length direction of the flat wire.

2. The stator assembly according to claim 1, characterized in that The flat wires located in the same flat wire slot include at least one of the first type flat wires, the second type flat wires and the third type flat wires; One side surface of the first type flat wire is provided with an oil guide groove, two mutually parallel side surfaces of the second type flat wire are provided with an oil guide groove, and each side surface of the third type flat wire is provided with an oil guide groove.

3. The stator assembly according to claim 2, characterized in that When all the flat wires in the same flat wire slot are flat wires of the first type, At least one of the oil guide grooves and the resin insulation layer encloses a first cooling channel, and / or at least one of the oil guide grooves and the adjacent side surfaces of the flat wires encloses the first cooling channel.

4. The stator assembly according to claim 3, characterized in that In the radial direction of the iron core, the openings of the oil guide grooves of at least two adjacent flat wires face in opposite directions.

5. The stator assembly according to claim 2, characterized in that When all the flat wires in the same flat wire slot are flat wires of the second type, One oil guide groove of at least one flat wire is enclosed with the resin insulation layer to form a first cooling channel, another oil guide groove is enclosed with one oil guide groove of an adjacent flat wire to form a second cooling channel, and / or both oil guide grooves of at least one flat wire are enclosed with the resin insulation layer to form two first cooling channels.

6. The stator assembly according to claim 2, characterized in that When the flat wires in the same flat wire slot include at least two of the first type flat wires, the second type flat wires, and the third type flat wires, the flat wire having more oil guide grooves is closer to the center of the core.

7. The stator assembly according to claim 1, characterized in that The corners of adjacent sides of the flat wire are rounded, and the adjacent rounded corners of adjacent flat wires and the insulating film enclose a rounded corner space; the opposite sides of two adjacent flat wires have a gap, and the gap is used to connect the oil guide groove and the rounded corner space.

8. The stator assembly according to claim 1, wherein: The flat wire groove has a width direction perpendicular to the radial direction of the iron core, and the oil guide groove is located at the center of the flat wire along the width direction of the iron core.

9. The stator assembly according to claim 1, wherein: The resin insulation layer is one of PI film, PPS film, PES film, PEEK film, PEI film or PTEF film.

10. A flat wire motor, characterized in that: The invention comprises a rotor assembly and a stator assembly according to any one of claims 1 to 9.

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