A flat wire motor stator structure for logistics vehicles and its production process

Abstract

The present application relates to a stator structure of a flat wire motor for a logistics vehicle and its production process, which relates to the technical field of motor power devices, and includes a stator, a wire slot, a hairpin coil and an O-type insulating paper. A number of wire slots are evenly arranged along the circumference of the stator, and each wire slot is provided with a connecting hole connected to the inner hole of the stator. The O-type insulating paper corresponds to the wire slot one by one and is plugged into the wire slot. The hairpin coil is plugged into the O-type insulating paper in the wire slot to form a stator winding; the O-type insulating paper includes a base located in the wire slot and an extension located in the connecting hole, and the cross-sectional area of ​​the extension can be reduced as the cross-sectional area of ​​the base increases. The present application has the effect that the base is expanded by compensating for the expansion part arranged in the connecting hole, increasing the cross-sectional area of ​​the O-type insulating paper located in the wire slot, thereby effectively avoiding the influence of the O-type insulating paper on the slot full rate of the motor.

Description

Technical Field

[0001] The present application relates to the technical field of motor power devices, and in particular to a stator structure of a flat wire motor for a logistics vehicle and a production process thereof. Background Art

[0002] At present, in the field of logistics and transportation, new energy vehicles are mostly used as logistics vehicles. In terms of power supply equipment, flat wire motors are widely used in the field of new energy logistics vehicles due to their advantages such as small size, high slot fill rate, high power density, good NVH performance, and better thermal conduction and heat dissipation performance.

[0003] In order to avoid short circuit between stator windings, existing flat wire motors need to insert insulating paper into the wire slots on the stator. Commonly used insulating papers include O-type, C-type, S-type, etc. Among them, O-type insulating paper can adapt to various types of stators and has a wide range of product compatibility. In order to facilitate the insertion of existing O-type insulating paper into the wire slot, the cross-sectional area of ​​the O-type insulating paper is usually smaller than the cross-sectional area of ​​the wire slot, which makes it difficult for the O-type insulating paper to fit the wire slot, thereby reducing the slot fill rate of the motor. Summary of the invention

[0004] In order to improve the problem that O-type insulating paper is difficult to fit into the wire slot and reduce the slot fill rate of the motor, the present application provides a stator structure of a flat wire motor for a logistics vehicle and a production process thereof.

[0005] On the one hand, the stator structure of a flat wire motor for a logistics vehicle provided in the present application adopts the following technical solution:

[0006] A stator structure of a flat wire motor for a logistics vehicle, comprising a stator, a wire slot, a hairpin coil and an O-shaped insulating paper, wherein a plurality of the wire slots are evenly arranged along the circumference of the stator, each wire slot is provided with a connecting hole connected to an inner hole of the stator, the O-shaped insulating paper corresponds to the wire slots one by one and is inserted into the wire slots, and the hairpin coil is inserted into the O-shaped insulating paper in the wire slots to form a stator winding;

[0007] The O-type insulating paper includes a base portion located in the wire slot and an extension portion located in the connecting hole, and the cross-sectional area of ​​the extension portion can be reduced as the cross-sectional area of ​​the base portion increases.

[0008] By adopting the above technical solution, when processing the stator structure, the insulating paper is first processed into O-shaped insulating paper, and then the O-shaped insulating paper is inserted into the corresponding wire slot one by one, and then the base is expanded in the wire slot through an expansion process to fill the wire slot, and then the PIN coil is made into a hairpin coil through a series of processes such as straightening, paint removal, cutting, and forming, and then the hairpin coil is inserted into the profiling tooling, and then all the hairpin coils are inserted into the iron core as a whole and pressed into the corresponding design size, and then the fixture positioning mechanism equipped with the stator is moved to the position to be layered and expanded. The expansion mechanism covers the upper ends of all layers of flat wires except the innermost two layers, and pulls the flat wires outward, then twists the ends of the flat wires into a certain shape, and then welds the twisted coil ends together to form a stator winding. The stator is then coated and painted, and the lead wires are welded to the stator winding to complete the production of the stator structure of the flat wire motor. The base is expanded by compensating for the expansion part arranged in the connecting hole, thereby increasing the cross-sectional area of ​​the O-type insulating paper in the wire slot, thereby effectively avoiding the influence of the O-type insulating paper on the slot fill rate of the motor and improving the slot fill rate of the motor.

[0009] In a specific implementation manner, the cross section of the extension portion is in a V-shaped structure, and the tip of the extension portion faces the center of the stator.

[0010] By adopting the above technical solution and utilizing the V-shaped design of the expansion part, it is convenient for the base to pull the expansion part out of the connecting hole, thereby improving the convenience of the expansion of the base.

[0011] In a specific possible implementation manner, the cross section of the expansion portion is in a U-shaped structure, and the end of the expansion portion faces the center of the stator.

[0012] By adopting the above technical solution and utilizing the U-shaped design of the extension part, the elasticity of the insulation paper on both sides of the end of the extension part is increased, the pressure between the insulation paper and the stator is increased, and the stability of the O-type insulation paper inserted in the wire slot is improved.

[0013] On the other hand, the present application provides a production process for a stator structure of a flat wire motor for a logistics vehicle using the following technical solution:

[0014] A production process of a flat wire motor stator structure for a logistics vehicle, using the above-mentioned flat wire motor stator structure for a logistics vehicle, comprises the following steps:

[0015] S1, insulating paper forming, processing the insulating paper into O-shaped insulating paper;

[0016] S2, a paper inserting step, inserting O-type insulating papers into the corresponding wire slots one by one, and then expanding the base in the wire slots through an expansion process to fill the wire slots;

[0017] S3, PIN coil forming, the PIN coil is made into a hairpin coil through a series of processes such as straightening, paint removal, cutting, and forming;

[0018] S4. Insert the coil. Insert the hairpin coil into the contoured tooling. Then insert all the hairpin coils into the iron core as a whole and press them into the corresponding design size.

[0019] S5, expanding, twisting, welding, moving the fixture positioning mechanism equipped with the stator to the layered expanding station, the expanding mechanism covers the upper ends of all layers of flat wires except the innermost two layers, and pulls the flat wires outward, then twists the ends of the flat wires into a certain shape, and then welds the ends of the twisted coils together to form the stator winding;

[0020] S6, coating and varnishing, coating and varnishing the stator;

[0021] S7. Lead wire welding: weld the lead wire to the stator winding.

[0022] In a specific feasible implementation scheme, in step S2, after the O-type insulating paper is inserted into the wire trough, an expansion airbag is inserted into the base of the O-type insulating paper, and then the expansion airbag is inflated. The expansion airbag expands the base to fit the wall of the wire trough, and the cross-section of the expanded portion decreases accordingly. After the base is fixed, the expansion airbag contracts and the O-type insulating paper is pulled out, forming an expansion process for the O-type insulating paper.

[0023] By adopting the above technical solution, the base is expanded to fit with the groove wall of the wire groove by utilizing the expansion of the expansion airbag, thereby increasing the cross-sectional area of ​​the O-type insulation paper in the wire groove, and then improving the slot fill rate of the motor; the expansion process of the O-type insulation paper is completed by the expansion airbag, thereby improving the convenience of expanding the O-type insulation paper.

[0024] In a specific possible implementation manner, four extrusion portions are formed on the circumference of the expansion airbag, and the extrusion portions can be matched with the corners of the wire groove.

[0025] By adopting the above technical solution, the O-type insulating paper is pressed onto the corner of the wire slot by the extrusion part, so that the porosity between the O-type insulating paper and the wire slot can be reduced and the cross-sectional area of ​​the O-type insulating paper in the wire slot can be increased.

[0026] In a specific possible implementation manner, in step S3, straightening: straightening the enameled copper wire in the up, down, left and right directions;

[0027] Paint removal: Use laser to remove the paint;

[0028] Cutting: Cut the copper wire into fixed lengths;

[0029] Forming: The cut copper wire is bent into a certain shape through a stamping process to adapt to the slot shape of the stator core.

[0030] In a specific possible implementation scheme, in step S4, before the hairpin coil is inserted into the O-type insulating paper, a support ring is used to support the extended portion of the O-type insulating paper, and the outer edge of the support ring is located on the inner side of the wire slot.

[0031] By adopting the above technical solution, the support ring supports the extended portion of the O-type insulating paper, which can prevent the O-type insulating paper from moving when the hairpin coil is inserted into the O-type insulating paper, thereby improving the stability of the O-type insulating paper in the wire slot.

[0032] In a specific implementation manner, the number of layers of the stator winding formed by inserting the hairpin coil into the slot is 8.

[0033] By adopting the above technical solution and using 8 layers of stator winding, the slot fill rate of the motor can be improved.

[0034] In a specific implementation scheme, in step S5:

[0035] Expanding: Move the fixture positioning mechanism equipped with the stator to the position to be expanded in layers. The expanding mechanism covers the upper ends of all flat wires except the innermost two layers, and pulls the flat wires outward to complete the expansion of all layers of flat wires successively.

[0036] Twisting: Move the twisting mechanism and the stator to the working position, extend the flaring mechanism to press against the ends of the two innermost layers of flat wires, align the ends of the two innermost layers of flat wires with the twisting mechanism, then move the flaring mechanism away from the upper ends of the flat wires and retract, insert the ends of the two innermost layers of flat wires into the twisting mechanism, and the inner and outer dies of the twisting mechanism rotate in opposite directions to complete the twisting process of the two innermost layers of flat wires;

[0037] Welding: mainly laser welding or argon arc welding, which melts copper at instantaneous high temperature to form welding points and complete the electrical connection of the stator winding.

[0038] In summary, the present application includes at least one of the following beneficial technical effects:

[0039] 1. When the stator structure of the flat wire motor is produced, the base is expanded by compensating through the expansion part arranged in the connecting hole, thereby increasing the cross-sectional area of ​​the O-type insulating paper located in the wire slot, thereby effectively avoiding the influence of the O-type insulating paper on the slot fill rate of the motor and improving the slot fill rate of the motor;

[0040] 2. By using the expansion of the expansion airbag, the base is expanded to fit with the wall of the wire slot, thereby increasing the cross-sectional area of ​​the O-type insulation paper in the wire slot, and then improving the slot fill rate of the motor; the expansion process of the O-type insulation paper is completed by the expansion airbag, which improves the convenience of the O-type insulation paper expansion;

[0041] 3. The support of the extended portion of the O-type insulating paper by the support ring can prevent the movement of the O-type insulating paper when the hairpin coil is inserted into the O-type insulating paper, thereby improving the stability of the O-type insulating paper in the wire slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of a stator structure of a flat wire motor for a logistics vehicle according to Example 1 of the present application.

[0043] Figure 2 It is a schematic diagram of the structure of the O-type insulating paper of this embodiment 1.

[0044] Figure 3 It is a schematic diagram of the structure of the O-type insulating paper of the second embodiment.

[0045] Figure 4 It is a schematic diagram for showing the structure of an inflatable airbag.

[0046] Figure 5 It is a schematic diagram for showing the structure of the support plate.

[0047] Figure 6 yes Figure 5 Enlarged view of part A in the middle.

[0048] Explanation of the reference numerals: 1. Shell; 2. Stator; 21. Wire slot; 22. Connecting hole; 3. Hairpin coil; 4. O-type insulating paper; 41. Base; 42. Extension part; 5. Stator winding; 6. Inflatable airbag; 61. Extrusion part; 7. Support ring. DETAILED DESCRIPTION

[0049] The following is combined with Figure 1-6 This application is described in further detail.

[0050] The embodiment of the present application discloses a stator structure of a flat wire motor for a logistics vehicle.

[0051] Example 1

[0052] Reference Figure 1 , Figure 2A stator structure of a flat wire motor for a logistics vehicle includes a housing 1, a stator 2, a wire slot 21, a hairpin coil 3 and an O-type insulating paper 4. The stator structure is installed in the housing 1. A plurality of wire slots 21 are evenly arranged along the circumference of the stator 2. Each wire slot 21 is provided with a connecting hole 22 connected to the inner hole of the stator 2. The O-type insulating paper 4 corresponds to the wire slot 21 one by one and is inserted into the wire slot 21. The hairpin coil 3 is inserted into the O-type insulating paper 4 in the wire slot 21 to form a stator winding 5. The O-type insulating paper 4 includes a base 41 located in the wire slot 21 and an extension 42 located in the connecting hole 22. The cross-sectional area of ​​the extension 42 can be reduced as the cross-sectional area of ​​the base 41 increases. When the base 41 expands in the wire slot 21, the cross-sectional area of ​​the extension 42 is reduced by pulling the insulating paper in the extension 42 into the wire slot 21.

[0053] When the stator 2 structure of the flat wire motor is produced, the base 41 is expanded by compensating through the extension portion 42 arranged in the connecting hole 22, thereby increasing the cross-sectional area of ​​the O-type insulating paper 4 located in the wire slot 21, thereby effectively avoiding the influence of the O-type insulating paper 4 on the slot fill rate of the motor and improving the slot fill rate of the motor.

[0054] Reference Figure 1 The stator winding 5 formed in this embodiment has 8 layers, and the 8-layer winding adopts a full-pitch single-layer connection mode, that is, the windings are all in the same slot and in the same phase, and the welding end winding has no bridge wire, only the three-phase power lead wire and the neutral wire are retained, and the lead wire and the neutral wire are concentrated and on the same side, which simplifies the layout of the winding end. In the U-phase winding, different branches are formed by flat wires from the starting points located at different layers to the end points in turn with hairpins to reciprocate between adjacent layers, and are wound along 8 layers and 72 slots. The V-phase winding and the W-phase winding are respectively rotated 8 and 16 slots relative to the U-phase winding in the direction of increasing slots. The arrangement of the hairpin coil 3 in the stator 2 structure of the 8-layer winding improves the performance of the motor and the feasibility of the manufacturing process by optimizing parallel branches, simplifying the structure, improving the slot full rate and potential balance.

[0055] Reference Figure 2 The cross-section of the extension portion 42 in this embodiment is V-shaped, and the tip of the extension portion 42 faces the center of the stator 2. The V-shaped design of the extension portion 42 facilitates the base 41 to pull the extension portion 42 out of the connecting hole 22, thereby improving the convenience of expansion of the base 41.

[0056] The implementation principle of Example 1 is: when the stator 2 structure of the flat wire motor is produced, the base 41 is expanded by compensating through the extension portion 42 set in the connecting hole 22, thereby increasing the cross-sectional area of ​​the O-type insulating paper 4 located in the wire slot 21, thereby effectively avoiding the influence of the O-type insulating paper 4 on the slot fill rate of the motor and improving the slot fill rate of the motor.

[0057] Example 2

[0058] Reference Figure 3 The cross-section of the extension portion 42 is a U-shaped structure, and the end of the extension portion 42 is toward the center of the stator 2. The U-shaped design of the extension portion 42 increases the elasticity of the insulating paper on both sides of the end of the extension portion 42, increases the pressure between the insulating paper and the stator 2, and improves the stability of the O-type insulating paper 4 when inserted into the wire slot 21.

[0059] The embodiment of the present application discloses a production process for a stator structure of a flat wire motor for a logistics vehicle.

[0060] A production process of a flat wire motor stator structure for a logistics vehicle, using the above-mentioned flat wire motor stator structure for a logistics vehicle, comprises the following steps:

[0061] S1, insulating paper forming, processing the insulating paper into O-shaped insulating paper 4.

[0062] First, use the pre-paper feeding assembly to pre-extract the insulating paper on the paper tray. This assembly includes a paper tray rack, a power source (such as a motor), a guide wheel, etc. The insulating paper is passed through the guide wheel for subsequent processing; the insulating paper is processed by the indentation assembly, which includes an indentation roller, and the groove of the first indentation roller is matched with the convex part of the second indentation roller to form an indentation, and then the insulating paper is bent along the indentation, and then the second molding unit is used to converge the insulating paper into shape, and the cutting unit is used to cut the insulating paper to a suitable size. Finally, the insulating paper is pushed into the molding groove by the third molding unit (including the pushing unit and the molding groove) to form it into the shape of the O-type insulating paper 4 required in this application.

[0063] S2, a paper inserting step, inserting the O-shaped insulating papers 4 into the corresponding wire slots 21 one by one, and then expanding the base 41 in the wire slots 21 through an expansion process to fill the wire slots 21.

[0064] First, the formed insulating paper is installed into the wire slot 21 through an insertion assembly. The insertion assembly includes a moving unit and a push rod. The push rod slides in the forming slot and is driven by the moving unit to push the insulating paper into the wire slot 21.

[0065] Reference Figure 4, insert the expansion airbag 6 into the base 41 of the O-type insulating paper 4. The expansion airbag 6 is made of rubber material. Vulcanization treatment is performed at four positions of the expansion airbag 6 to harden it, forming four extrusion parts 61. The end faces of the extrusion parts 61 are two vertical planes, and they are adapted to the side walls at the corners of the wire slot 21. Then the expansion airbag 6 is inflated, and the expansion airbag 6 expands the base 41 to fit the groove wall of the wire slot 21, and the cross-section of the expansion part 42 is reduced accordingly. After the base 41 is qualitatively determined, the expansion airbag 6 shrinks and the O-type insulating paper 4 is pulled out to form the expansion process of the O-type insulating paper 4. When the expansion airbag 6 is inflated, the four extrusion parts 61 squeeze the O-type insulating paper 4 to the corners of the wire slot 21. The extrusion part 61 is used to press the O-type insulating paper 4 at the corners of the wire slot 21, which can reduce the porosity between the O-type insulating paper 4 and the wire slot 21 and increase the cross-sectional area of ​​the O-type insulating paper 4 in the wire slot 21.

[0066] By utilizing the expansion of the expansion bag 6, the base 41 is expanded to fit with the groove wall of the wire groove 21, thereby increasing the cross-sectional area of ​​the O-type insulation paper 4 in the wire groove 21, and then improving the slot fill rate of the motor; the expansion process of the O-type insulation paper 4 is completed by the expansion bag 6, and the convenience of expanding the O-type insulation paper 4 is improved.

[0067] S3, PIN coil forming, the PIN coil is made into a hairpin coil 3 through a series of processes such as straightening, paint removal, cutting, and forming.

[0068] Straightening: Straighten the enameled copper wire in the up, down, left and right directions to ensure the straightness of the copper wire.

[0069] Paint removal: Use laser to remove the paint so that the copper wire can be well connected during the subsequent welding process.

[0070] Cutting: Cutting the copper wire into fixed lengths ensures the coils are of consistent length.

[0071] Forming: The cut copper wire is bent into a certain shape by means of a stamping process to adapt to the slot shape of the stator 2 core. The press forming is first plane forming and then three-dimensional forming to form the hairpin coil 3.

[0072] S4, coil insertion, refer to Figure 5 , Figure 6Before the hairpin coil 3 is inserted into the O-type insulating paper 4, the extension part 42 of the O-type insulating paper 4 is supported by the support ring 7. The support ring 7 is located at the end of the stator 2 along which the hairpin coil 3 is inserted. In order to ensure the insulating effect of the O-type insulating paper 4, the O-type insulating paper 4 will extend out of a part of the wire slot 21. For this reason, there is a certain distance between the support ring 7 and the end wall of the stator 2, and the outer edge of the support ring 7 is located on the inner side of the wire slot 21. The support of the extension part 42 of the O-type insulating paper 4 by the support ring 7 can prevent the movement of the O-type insulating paper 4 when the hairpin coil 3 is inserted into the O-type insulating paper 4, thereby improving the stability of the O-type insulating paper 4 in the wire slot 21.

[0073] Insert the hairpin coils 3 into the contoured tooling, and then insert all the hairpin coils 3 as a whole into the iron core and press them into the corresponding design size to form an 8-layer stator 2 structure.

[0074] S5, expanding, twisting, welding, move the fixture positioning mechanism equipped with the stator 2 to the position to be expanded in layers, the expanding mechanism covers the upper ends of all layers of flat wires except the innermost two layers, and pulls the flat wires outward, then twists the ends of the flat wires into a certain shape, and then welds the twisted coil ends together to form the stator winding 5.

[0075] Expanding: Move the fixture positioning mechanism equipped with the stator 2 to the position to be expanded in layers, and the expanding mechanism covers the upper ends of all flat wires except the innermost two layers, and pulls the flat wires outward to complete the expansion of all layers of flat wires successively;

[0076] Twisting: Move the twisting mechanism and stator 2 to the working position, extend the flaring mechanism to abut the ends of the two innermost layers of flat wires, align the ends of the two innermost layers of flat wires with the twisting mechanism, then move the flaring mechanism away from the upper ends of the flat wires and retract, insert the ends of the two innermost layers of flat wires into the twisting mechanism, and rotate the inner and outer dies of the twisting mechanism in opposite directions to complete the twisting process of the two innermost layers of flat wires;

[0077] Welding: mainly laser welding or argon arc welding, which melts copper at instantaneous high temperature to form welding points, thus completing the electrical connection of the stator winding 5.

[0078] S6, coating and varnishing, the stator 2 is subjected to coating and varnishing treatment.

[0079] Coating and loading: First, place the stator 2 on the coating equipment to prepare for the coating process.

[0080] Armature preheating: Preheat the stator 2 to improve the fluidity and coating effect of the insulating varnish.

[0081] Armature coating: Insulating material is coated on the preheated stator 2, which can be powder or liquid material, to increase the thickness and strength of the insulation layer.

[0082] Armature curing: The coated stator 2 needs to enter a curing oven for curing to ensure that the insulating material is completely cured to form a solid insulating layer.

[0083] Coating and unloading: After curing is completed, the stator 2 is removed from the coating equipment and prepared for the next step of paint dripping.

[0084] Weighing of armature before painting: Before painting, the stator 2 is weighed to monitor the material usage and curing effect.

[0085] Scan the code before painting the armature: record the information of stator 2 by scanning the code to ensure that each stator 2 can be placed in the correct position for subsequent production operations.

[0086] Armature paint dripping and loading: Place the stator 2 on the paint dripping equipment and prepare for the paint dripping process.

[0087] Armature preheating: Preheat the stator 2 again to ensure the fluidity of the insulating paint when dripping the paint.

[0088] Armature paint dripping: The stator 2 is subjected to paint dripping treatment through the paint dripping equipment, and the insulating paint is evenly dripped on the flat wire of the stator 2 and fills the gap between the flat wire and the slot body.

[0089] Armature gel curing: After dripping the paint, the stator 2 is gelled so that the insulating paint quickly enters the gel state and initially fixes the insulating layer.

[0090] Armature unloading: After the gel is cured, the stator 2 is removed from the paint dripping equipment.

[0091] Weighing of armature after painting: Stator 2 is weighed again to ensure that the material changes during painting and curing meet the requirements.

[0092] Cooling process: Finally, the stator 2 is rapidly cooled to a safe operating temperature by natural cooling or forced air cooling, completing the entire coating and varnishing process.

[0093] S7, lead wire welding: welding the lead wire to the stator winding 5.

[0094] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A production process for a flat wire motor stator structure for a logistics vehicle, characterized in that: The steps include: S1, forming the insulating paper, processing the insulating paper into O-shaped insulating paper (4); S2, a paper inserting step, inserting the O-type insulating papers (4) into the corresponding wire slots (21) one by one, and then expanding the base (41) in the wire slots (21) through an expansion process to fill the wire slots (21); S3, PIN coil forming, the PIN coil is subjected to a series of processes such as straightening, paint removal, cutting, and forming to form a hairpin coil (3); S4, coil insertion, inserting the hairpin coil (3) into the contour tooling, and then inserting all the hairpin coils (3) as a whole into the iron core and pressing them into the corresponding design size; S5, expanding, twisting, and welding. The fixture positioning mechanism equipped with the stator (2) is moved to the position to be expanded in layers. The expanding mechanism covers the upper ends of all layers of flat wires except the innermost two layers, and pulls the flat wires outward. The ends of the flat wires are twisted into a certain shape, and the ends of the twisted coils are welded together to form a stator winding (5). S6, coating and varnishing, coating and varnishing the stator (2); S7, lead wire welding: welding the lead wire to the stator winding (5).

2. The production process of the stator structure of the flat wire motor for logistics vehicles according to claim 1 is characterized in that: In step S2, after the O-type insulating paper (4) is inserted into the wire trough (21), the expansion airbag (6) is inserted into the base (41) of the O-type insulating paper (4), and then the expansion airbag (6) is inflated. The expansion airbag (6) expands the base (41) to fit the groove wall of the wire trough (21), and the cross-section of the expansion part (42) is reduced accordingly. After the base (41) is fixed, the expansion airbag (6) is contracted and the O-type insulating paper (4) is pulled out, forming an expansion process of the O-type insulating paper (4).

3. The production process of the stator structure of the flat wire motor for logistics vehicles according to claim 2 is characterized in that: Four extrusion portions (61) are formed in the circumference of the expansion airbag (6), and the extrusion portions (61) can be matched with the corners of the wire groove (21).

4. The production process of the stator structure of the flat wire motor for logistics vehicles according to claim 1 is characterized in that: In step S3, straightening: straightening the enameled copper wire in the up, down, left and right directions; Patent leather removal: Use laser to remove the patent leather; Cutting: Cut the copper wire into fixed lengths; Forming: The cut copper wire is bent into a certain shape by means of a stamping process to adapt to the slot shape of the stator (2) core.

5. The production process of the stator structure of the flat wire motor for logistics vehicles according to claim 1 is characterized in that: In step S4, before the hairpin coil (3) is inserted into the O-type insulating paper (4), the extended portion (42) of the O-type insulating paper (4) is supported by a support ring (7), and the outer edge of the support ring (7) is located on the inner side of the wire slot (21).

6. The production process of the stator structure of the flat wire motor for logistics vehicles according to claim 1 is characterized by: The number of layers of the stator winding (5) formed by inserting the hairpin coil (3) into the wire slot (21) is 8.

7. The production process of the stator structure of the flat wire motor for logistics vehicles according to claim 1, characterized in that: In step S5: Expanding: the fixture positioning mechanism equipped with the stator (2) is moved to the position to be expanded in layers, the expanding mechanism covers the upper ends of all flat wires except the innermost two layers, and pulls the flat wires outward, and the expansion of all layers of flat wires is completed successively; Twisting: the twisting mechanism and the stator (2) are moved to the working position, the flaring mechanism is extended to abut against the ends of the two innermost layers of flat wires, so that the ends of the two innermost layers of flat wires are aligned with the twisting mechanism, and then the flaring mechanism is moved away from the upper ends of the flat wires and retracted, and then the ends of the two innermost layers of flat wires are inserted into the twisting mechanism, and the inner and outer dies of the twisting mechanism rotate in opposite directions, completing the twisting process of the two innermost layers of flat wires; Welding: mainly laser welding or argon arc welding, which forms welding spots by melting copper to complete the electrical connection of the stator winding (5).

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