Flat wire welding method, stator winding and electric machine

Abstract

The application discloses a flat wire welding method, a stator winding and a motor, and belongs to the technical field of welding. The flat wire welding method, the stator winding and the motor are characterized in that the size of a gap between the end faces of a first flat wire and a second flat wire is obtained, and when the size of the gap meets preset conditions, a first laser beam and a second laser beam are respectively irradiated along preset welding moving tracks in the end faces of the first flat wire and the second flat wire to respectively form a first molten pool and a second molten pool, at this time, no laser is shot into the gap, then a third laser beam is moved between the first molten pool and the second molten pool to make the first molten pool and the second molten pool fuse, so that the gap is filled through the fused molten pool, and thus the welding can be realized when there is a certain gap between the end faces of the first flat wire and the second flat wire, and the flat wire welding stability, the welding efficiency and the welding quality can be improved compared with the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding, in particular to a flat wire welding method, a stator winding and a motor. BACKGROUND

[0002] Flat wire motors are widely used due to their high slot fill factor, small size, high efficiency and low noise. Laser welding, as a core process in the production of flat wire motors, determines the overall performance of the motor.

[0003] In the prior art, the tool fixture cannot achieve the desired effect of the two flat wires to be welded, that is, after clamping and cutting the two flat wires to be welded, there are still problems such as height difference, gap, angle, misalignment between the two flat wires, resulting in poor welding stability, low welding efficiency and difficult to guarantee the welding quality. SUMMARY

[0004] The purpose of the present application is to provide a flat wire welding method, a stator winding and a motor, which can improve the welding stability, welding efficiency and welding quality of the flat wire.

[0005] To achieve the above-mentioned purpose, the following technical solutions are provided:

[0006] In a first aspect, a flat wire welding method is provided for welding a first flat wire and a second flat wire to be welded, the flat wire welding method comprising:

[0007] Obtaining the size of the gap between the end faces of the first flat wire and the second flat wire;

[0008] Determining whether the size of the gap meets a predetermined condition; the predetermined condition includes a first predetermined condition; the size of the gap includes the gap width a and the misalignment distance b between the end faces of the first flat wire and the second flat wire;

[0009] If the gap width a or the misalignment distance b between the end faces of the first flat wire and the second flat wire meets the first predetermined condition, a first laser beam and a second laser beam are respectively irradiated along a predetermined welding movement trajectory in the end face of the first flat wire and the second flat wire to form a first molten pool and a second molten pool, respectively.

[0010] A third laser beam is used to move between the first molten pool and the second molten pool to make the first molten pool and the second molten pool fuse.

[0011] As an optional solution of the flat wire welding method, the predetermined welding movement trajectory includes a running trajectory and a swinging trajectory, and the first laser beam and the second laser beam swing along the swinging trajectory and run along the running trajectory, respectively.

[0012] As an alternative to the flat wire welding method, the first laser beam, the second laser beam and / or the third laser beam are adjustable ring film lasers.

[0013] As an alternative to the flat wire welding method, the preset condition further comprises a second preset condition; and the size of the gap further comprises a height difference h between the end faces of the first flat wire and the second flat wire.

[0014] The flat wire welding method further comprises the following steps: if the height difference h between the end faces of the first flat wire and the second flat wire meets the second preset condition, the laser output power of the first laser beam and the second laser beam is determined according to the height of the end faces of the first flat wire and the second flat wire and the height difference h between the end faces of the first flat wire and the second flat wire, and the first laser beam and the second laser beam are caused to emit respectively according to the determined laser output power.

[0015] As an alternative to the flat wire welding method, the laser output power of the first laser beam and the second laser beam is determined according to the height of the end faces of the first flat wire and the second flat wire and the height difference h between the end faces of the first flat wire and the second flat wire, and the first laser beam and the second laser beam are caused to emit respectively according to the determined laser output power, comprising the following steps:

[0016] If the height difference h between the end faces of the first flat wire and the second flat wire is zero, the laser output power of the first laser beam and the second laser beam is determined to be equal.

[0017] If the height difference h between the end faces of the first flat wire and the second flat wire is not zero, the laser output power of the laser beam corresponding to the flat wire with the smaller height of the end faces is determined to be smaller than the laser output power of the laser beam corresponding to the flat wire with the larger height of the end faces.

[0018] As an alternative to the flat wire welding method, the laser output power of the first laser beam and the second laser beam is determined according to the height of the end faces of the first flat wire and the second flat wire and the height difference h between the end faces of the first flat wire and the second flat wire, and the first laser beam and the second laser beam are caused to emit respectively according to the determined laser output power, further comprising the following steps:

[0019] According to the height difference h between the end faces of the first flat wire and the second flat wire, offset data of the laser beam corresponding to the flat wire with the larger height of the end faces is given to reduce the distance between the first laser beam and the second laser beam; the offset data is configured to correct the height difference h between the end faces of the first flat wire and the second flat wire.

[0020] As an alternative to the flat wire welding method, the size of the gap is obtained by a visual device.

[0021] In a second aspect, a stator winding is provided, which is made by the flat wire welding method according to any one of the preceding aspects.

[0022] In a third aspect, an electric machine is provided, comprising a stator winding according to the preceding aspect.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] The flat wire welding method, the stator winding and the electric machine of the present application first obtain the size of the gap between the end faces of the first flat wire and the second flat wire, and when the size of the gap meets the preset condition, the first laser beam and the second laser beam are respectively irradiated along the preset welding moving track in the end face of the first flat wire and the end face of the second flat wire to form the first molten pool and the second molten pool, respectively. At this time, no laser is shot into the gap, so the part other than the welding part of the first flat wire and the second flat wire will not be damaged. Then the third laser beam is moved between the first molten pool and the second molten pool to make the first molten pool and the second molten pool fuse, which is equivalent to stirring the first molten pool and the second molten pool to fill the gap through the fused molten pool. Thus, the welding can be realized when there is a certain gap between the end faces of the first flat wire and the second flat wire, and the flat wire welding stability, welding efficiency and welding quality can be improved compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the first welding method of the first flat wire and the second flat wire in the embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of the second welding method of the first flat wire and the second flat wire in the embodiment of the present application.

[0027] Figure 3 It is a schematic diagram of the state when there is an included angle between the first flat wire and the second flat wire in the embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of the welding method when the first flat wire and the second flat wire are misaligned in the embodiment of the present application.

[0029] Figure 5 It is a flowchart of the flat wire welding method in the embodiment of the present application.

[0030] Figure 6 It is a schematic diagram of the state when there is a height difference between the end faces of the first flat wire and the second flat wire in the embodiment of the present application.

[0031] Figure 7 It is a schematic diagram of the shape of the preset welding moving track formed when the running track is circular and the swinging track is wavy in the embodiment of the present application.

[0032] REFERENCE NUMERALS:

[0033] 100, first flat wire; 200, second flat wire;

[0034] 11, preset welding moving track one; 21, preset welding moving track two; 31, preset welding moving track three. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0037] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "arranged", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0041] Embodiments of the present application are described in detail below with reference to examples shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0042] As shown in the drawings, Figures 1-7 The present embodiment provides a flat wire welding method for welding a first flat wire 100 and a second flat wire 200 to be welded. It can be understood that the first flat wire 100 has a first side facing the second flat wire 200, and the second flat wire 200 has a second side facing the first flat wire 100. The welding of the first flat wire 100 and the second flat wire 200 to be welded is to weld the first side and the second side.

[0043] Optionally, the material of the first flat wire 100 and the second flat wire 200 is copper, or aluminum, or an alloy with copper or aluminum as the main component, so that the first flat wire 100 and the second flat wire 200 have high electrical conductivity.

[0044] In the present embodiment, the first flat wire 100 and the second flat wire 200 are both rectangular structures, and the first flat wire 100 and the second flat wire 200 both include wide edges and narrow edges. Exemplarily, the wide edges are not greater than 6mm, and the narrow edges are not greater than 5mm. The wide edges of the first flat wire 100 and the second flat wire 200 can be welded, or the narrow edges of the first flat wire 100 and the second flat wire 200 can be welded.

[0045] The flat wire welding method of the present embodiment includes the following steps:

[0046] S11, obtaining the size of the gap between the end faces of the first flat wire 100 and the second flat wire 200;

[0047] S21, judging whether the size of the gap meets a preset condition; the preset condition includes a first preset condition; the size of the gap includes a gap width a and a misalignment distance b between the end faces of the first flat wire 100 and the second flat wire 200;

[0048] It should be noted that, as shown in Figure 3 When there is an included angle q between the first side and the second side, the maximum distance l between the first side and the second side is taken as the gap width a.

[0049] S31, if the gap width a or the misalignment distance b of the end faces of the first flat wire 100 and the second flat wire 200 meets the first preset condition, the first laser beam and the second laser beam are respectively irradiated along the preset welding moving track in the end face of the first flat wire 100 and the second flat wire 200, to respectively form the first molten pool and the second molten pool.

[0050] S41, the third laser beam is used to move between the first molten pool and the second molten pool, so that the first molten pool and the second molten pool are fused.

[0051] As shown in Figure 1 , Figure 2 and Figure 4 For ease of understanding, the preset welding moving track of the first laser beam is denoted as preset welding moving track one 11, the preset welding moving track of the second laser beam is denoted as preset welding moving track two 21, and the welding moving track of the third laser beam is denoted as preset welding moving track three 31.

[0052] In this embodiment, the gap width a or the misalignment distance b meeting the first preset condition is that the gap width a or the misalignment distance b is in the preset distance interval.

[0053] It should be noted that the value of the preset distance interval is not limited in this embodiment. For ease of description, the two end point values of the preset distance interval are denoted as preset distance minimum value and preset distance maximum value, respectively. The gap width a or the misalignment distance b is in the preset distance interval, that is, preset distance minimum value ≤ gap width a or misalignment distance b ≤ preset distance maximum value. At this time, it can be considered that there is a certain gap or misalignment between the first flat wire 100 and the second flat wire 200, and the gap width a or the misalignment distance b is small. The flat wire welding method of this embodiment is used to weld the first flat wire 100 and the second flat wire 200, which can meet the flat wire welding requirements.

[0054] The flat wire welding method of the embodiment first acquires the size of the gap between the end faces of the first flat wire 100 and the second flat wire 200, and when the size of the gap meets the preset condition, the first laser beam and the second laser beam are respectively irradiated along the preset welding moving track in the end face of the first flat wire 100 and the second flat wire 200 to respectively form the first molten pool and the second molten pool. At this time, no laser is shot into the gap, so the part of the first flat wire 100 and the second flat wire 200 outside the welding position will not be damaged. Then the third laser beam is moved between the first molten pool and the second molten pool to make the first molten pool and the second molten pool fuse, which is equivalent to stirring the first molten pool and the second molten pool to fill the gap through the fused molten pool. Thus, the welding can be realized when there is a certain gap between the end faces of the first flat wire 100 and the second flat wire 200, and the flat wire welding stability, welding efficiency and welding quality can be improved compared with the prior art.

[0055] Further, step S21 further includes the following steps:

[0056] If the gap width a or the misalignment distance b of the end faces of the first flat wire 100 and the second flat wire 200 does not meet the first preset condition, that is, the width of the gap is not in the preset interval, it is judged whether the width of the gap is greater than the maximum value in the preset interval. If yes, the first flat wire 100 and the second flat wire 200 are trimmed until the width of the gap is less than the gap threshold, and then step S31 is entered.

[0057] The width of the gap is not in the preset interval and the width of the gap is greater than the maximum value in the preset interval, that is, the width of the gap > the maximum value of the preset interval. At this time, it can be considered that there is a certain gap between the first flat wire 100 and the second flat wire 200, and the width of the gap is large. The first flat wire 100 and the second flat wire 200 can be rejected and trimmed before welding, which is beneficial to ensure the welding quality and welding efficiency.

[0058] Further, if the width of the gap is not in the preset interval and the width of the gap is not greater than the maximum value in the preset interval, it means that the width of the gap < the minimum value of the preset interval. At this time, it is considered that the width of the gap is very small, and the laser will not enter the gap, so the existing welding method can meet the flat wire welding requirements.

[0059] Further, the preset condition further includes a second preset condition; and the size of the gap further includes a height difference h between the end faces of the first flat wire 100 and the second flat wire 200.

[0060] The flat wire welding method of the embodiment further includes the following steps: if the height difference h between the end faces of the first flat wire 100 and the second flat wire 200 meets the second preset condition, the laser output powers of the first laser beam and the second laser beam are determined according to the height of the end faces of the first flat wire 100 and the second flat wire 200 and the height difference h between the end faces of the first flat wire 100 and the second flat wire 200, and the first laser beam and the second laser beam are caused to emit respectively according to the determined laser output powers.

[0061] In the embodiment, the height difference h meeting the second preset condition is that the height difference h is not greater than a height difference threshold. It should be noted that the value of the height difference threshold is not limited in the embodiment.

[0062] The height difference threshold is a standard for judging whether the height difference h between the end faces of the first flat wire 100 and the second flat wire 200 to be welded is qualified. When the height difference h between the end faces of the first flat wire 100 and the second flat wire 200 is not greater than the height difference threshold, it is considered that the height difference h between the end faces of the first flat wire 100 and the second flat wire 200 to be welded is qualified. Then, the laser output powers of the first laser beam and the second laser beam are adjusted according to the height of the end faces of the first flat wire 100 and the second flat wire 200 and the height difference h between the end faces of the first flat wire 100 and the second flat wire 200, and the melting height of the first flat wire 100 and the second flat wire 200 is controlled. This is conducive to adjusting the end face height difference h between the first flat wire 100 and the second flat wire 200, avoiding welding defects such as head skewing, and further achieving the purpose of improving the welding quality.

[0063] When the end face height difference h between the first flat wire 100 and the second flat wire 200 is greater than the height difference threshold, it is considered that the end face height difference h between the first flat wire 100 and the second flat wire 200 to be welded is unqualified. Then, the first flat wire 100 and the second flat wire 200 can be rejected and trimmed first, and the next step is performed after they are qualified. This is conducive to improving the welding quality and the welding efficiency.

[0064] In the embodiment, the laser output powers of the first laser beam and the second laser beam are determined according to the height of the end faces of the first flat wire 100 and the second flat wire 200 and the height difference h between the end faces of the first flat wire 100 and the second flat wire 200, and the first laser beam and the second laser beam are caused to emit respectively according to the determined laser output powers. This includes the following steps:

[0065] If the height difference h between the end faces of the first flat wire 100 and the second flat wire 200 is zero, the laser output powers of the first laser beam and the second laser beam are determined to be equal;

[0066] If the height difference h between the end faces of the first flat wire 100 and the second flat wire 200 is not zero, the laser output power of the laser beam corresponding to the flat wire with the smaller height of the end face is smaller than the laser output power of the laser beam corresponding to the flat wire with the larger height of the end face.

[0067] It should be noted that the end face height difference h is not greater than the height difference threshold value, including two cases, one is that the end face height difference h is zero, and the other is that zero < end face height difference h ≤ height difference threshold value.

[0068] When the end face height difference h is zero, that is, the end faces of the first flat wire 100 and the second flat wire 200 are flush, there is no height difference, at this time, the laser output powers of the first laser beam and the second laser beam are equal, and then the melting heights of the first flat wire 100 and the second flat wire 200 can be equal, thereby ensuring the welding quality.

[0069] When zero < end face height difference h ≤ height difference threshold value, at this time, the laser output power of the laser beam corresponding to the flat wire with the smaller height of the end face is smaller than the laser output power of the laser beam corresponding to the flat wire with the larger height of the end face, and then the melting height of the flat wire with the smaller height of the end face under the action of the corresponding laser beam is smaller, in other words, the formed molten pool is smaller, while the melting height of the flat wire with the larger height of the end face under the action of the corresponding laser beam is larger, in other words, the formed molten pool is larger, thereby the liquid in the large molten pool can flow to the small molten pool, which is conducive to adjusting the end face height difference h between the first flat wire 100 and the second flat wire 200, and then the melting height of the first flat wire 100 and the melting height of the second flat wire 200 can be equal, which is conducive to solving the poor welding such as head skew.

[0070] Exemplarily, in the embodiment, the flat wire with the smaller height of the end face is the first flat wire 100, and the flat wire with the larger height of the end face is the second flat wire 200, then the laser beam corresponding to the flat wire with the smaller height of the end face is the first laser beam, and the laser beam corresponding to the flat wire with the larger height of the end face is the second laser beam. Of course, in other embodiments, it can also be set that the flat wire with the smaller height of the end face is the second flat wire 200, and the flat wire with the larger height of the end face is the first flat wire 100, then the laser beam corresponding to the flat wire with the smaller height of the end face is the second laser beam, and the laser beam corresponding to the flat wire with the larger height of the end face is the first laser beam.

[0071] When the end face height difference h is zero, the laser output powers of the first laser beam and the second laser beam are recorded as a preset power. The value of the preset power is not limited in the embodiment, and exemplarily, the value of the preset power can be determined according to experience or repeated experiments.

[0072] Optionally, when the end face height difference h is less than or equal to a height difference threshold, the laser output power of the laser beam corresponding to the shorter end face is less than a preset power. Furthermore, when the end face height difference h is less than or equal to the height difference threshold, the laser output power of the laser beam corresponding to the taller end face is greater than a preset power. This configuration facilitates rapid determination of the laser output power of the first and second laser beams, improving welding efficiency.

[0073] Optionally, the laser output powers of the first laser beam and the second laser beam are determined according to the heights of the end surfaces of the first flat wire 100 and the second flat wire 200 and the height difference h between the end surfaces of the first flat wire 100 and the second flat wire 200, and the first laser beam and the second laser beam are emitted according to the determined laser output powers, respectively, further comprising the following steps:

[0074] According to the height difference h between the end faces of the first flat wire 100 and the second flat wire 200, the laser beam offset data corresponding to the flat wire with the higher end face is given to reduce the distance between the first laser beam and the second laser beam; the offset data is configured to be suitable for correcting the height difference h between the end faces of the first flat wire 100 and the second flat wire 200.

[0075] It should be noted that, based on the height difference h between the end faces of the first flat wire 100 and the second flat wire 200, the laser beam offset data corresponding to the flat wire with a larger end face height is given, so that the laser beam corresponding to the flat wire with a larger end face height can be translated toward the laser beam corresponding to the flat wire with a smaller end face height, which is equivalent to reducing the distance between the first laser beam and the second laser beam, so that the molten pool formed by the flat wire with a larger end face height under the action of its corresponding laser beam can flow to the flat wire with a smaller end face height, so as to compensate for the height of the flat wire with a smaller end face height, thereby achieving the purpose of correcting the height difference.

[0076] In this embodiment, the size of the gap is obtained by a visual device. Specifically, the gap width a, the offset distance b, and the height difference h between the end faces of the first flat wire 100 and the second flat wire 200 are obtained by a visual device.

[0077] Exemplarily, the visual device is a 3D laser profiler. Of course, in other embodiments, the size of the gap can also be obtained by other visual devices or ranging sensors such as laser ranging sensors or infrared ranging sensors, which are not limited here.

[0078] In summary, the flat wire welding method of this embodiment can solve the problems of poor welding stability, low welding efficiency and poor welding quality caused by height difference, gap, angle and misalignment between the first flat wire 100 and the second flat wire 200 to be welded.

[0079] Optionally, the preset welding movement track one 11, the preset welding movement track two 21 and the preset welding movement track three 31 all include a running track and a swinging track. In the embodiment, the laser beams are emitted by the laser emitters, and it can be understood that the laser emitters swing in place to form the swinging tracks, and the laser emitters run along the welding direction to form the running tracks. In other words, the first laser beam, the second laser beam and the third laser beam respectively run along the corresponding running tracks and respectively swing along the corresponding swinging tracks.

[0080] For the convenience of description, the running track of the first laser beam is denoted as a first running track, and the swinging track of the first laser beam is denoted as a first swinging track; the running track of the second laser beam is denoted as a second running track, and the swinging track of the second laser beam is denoted as a second swinging track; the running track of the third laser beam is denoted as a third running track, and the swinging track of the third laser beam is denoted as a third swinging track.

[0081] Optionally, the first running track is annular. Optionally, the second running track is annular. Optionally, the third running track is annular. It should be noted that the annular shape can be a regular annular shape such as a circular ring, an elliptical ring, a rectangular ring, etc., or an irregular annular shape. Further, the rectangular ring can be a square ring or a rectangular ring.

[0082] Optionally, the first swinging track is a wavy line, a spiral line, an ∞ shape, an 8 shape, a circle, a square wave or a sawtooth shape. Optionally, the second swinging track is a wavy line, a spiral line, an ∞ shape, an 8 shape, a circle, a square wave or a sawtooth shape. Optionally, the third swinging track is a wavy line, a spiral line, an ∞ shape, an 8 shape, a circle, a square wave or a sawtooth shape.

[0083] In this way, the phenomenon of liquid droplets splashing during welding can be improved, and the welding quality can be further improved.

[0084] Figure 7 The preset welding movement track formed when the running track is circular and the swinging track is a wavy line is shown. In the embodiment, the first laser beam, the second laser beam and the third laser beam all adopt the movement path as shown in FIG. 8. Figure 7

[0085] In other embodiments, the first laser beam can also be an adjustable annular film laser, the second laser beam can also be an adjustable annular film laser, and the third laser beam can also be an adjustable annular film laser, which can also achieve the purpose of improving the phenomenon of liquid droplets splashing during welding.

[0086] The embodiment also provides a stator winding and a motor. The motor includes the stator winding, and the stator winding is made by using the flat wire welding method described above.

[0087] ​Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications and substitutions can be made without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A flat wire welding method for welding a first flat wire (100) and a second flat wire (200) to be welded, characterized in that: The flat wire welding method comprises: Obtaining the size of the gap between the end faces of the first flat wire (100) and the second flat wire (200); Determining whether the size of the gap meets a preset condition; the preset condition includes a first preset condition; the size of the gap includes a gap width a and a misalignment distance b between the end faces of the first flat wire (100) and the second flat wire (200); If the gap width a or the offset distance b between the end surfaces of the first flat wire (100) and the second flat wire (200) meets the first preset condition, a first laser beam and a second laser beam are irradiated along a preset welding movement trajectory in the end surfaces of the first flat wire (100) and the second flat wire (200) to form a first molten pool and a second molten pool respectively; using a third laser beam to move between the first molten pool and the second molten pool to fuse the first molten pool and the second molten pool; The preset condition also includes a second preset condition; the size of the gap also includes a height difference h between the end faces of the first flat wire (100) and the second flat wire (200); The flat wire welding method further comprises the following steps: if the height difference h between the end faces of the first flat wire (100) and the second flat wire (200) satisfies the second preset condition, then according to the heights of the end faces of the first flat wire (100) and the second flat wire (200) and the height difference h between the end faces of the first flat wire (100) and the second flat wire (200), respectively determining the laser output powers of the first laser beam and the second laser beam, and respectively emitting the first laser beam and the second laser beam according to the determined laser output powers; According to the heights of the end faces of the first flat wire (100) and the second flat wire (200) and the height difference h between the end faces of the first flat wire (100) and the second flat wire (200), respectively determining the laser output powers of the first laser beam and the second laser beam, and respectively emitting the first laser beam and the second laser beam according to the determined laser output powers, the method comprises the following steps: If the height difference h between the end faces of the first flat wire (100) and the second flat wire (200) is zero, it is determined that the laser output powers of the first laser beam and the second laser beam are equal; If the height difference h between the end faces of the first flat wire (100) and the second flat wire (200) is not zero, it is determined that the laser output power of the laser beam corresponding to the flat wire with the smaller end face height is smaller than the laser output power of the laser beam corresponding to the flat wire with the larger end face height; According to the height difference h between the end faces of the first flat wire (100) and the second flat wire (200), the laser beam offset data corresponding to the flat wire with the larger end face is given to reduce the distance between the first laser beam and the second laser beam; the offset data is configured to be suitable for correcting the height difference h between the end faces of the first flat wire (100) and the second flat wire (200).

2. The flat wire welding method according to claim 1, characterized in that: The preset welding movement trajectory includes a traveling trajectory and a swinging trajectory, and the first laser beam and the second laser beam swing along the swinging trajectory and travel along the traveling trajectory respectively.

3. The flat wire welding method according to claim 2, characterized in that: The first laser beam, the second laser beam and / or the third laser beam are adjustable ring film lasers.

4. The flat wire welding method according to claim 1, characterized in that: The size of the gap is obtained by visual equipment.

5. Stator winding, characterized in that, The flat wire is manufactured by the flat wire welding method according to any one of claims 1 to 4.

6. The motor is characterized in that Comprising the stator winding according to claim 5.

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