Flat wire and stator of flat wire motor

Abstract

The utility model provides a flat wire and a stator of a flat wire motor. The flat wire comprises a first straight line section, a first arc section, a first sinking section, a bending section, a second sinking section, a second arc section and a second straight line section which are connected in sequence; the first linear section, the first arc section, the first sinking section, the second sinking section, the second arc section and the second linear section form a U-shaped structure by taking the bending section as a center; the first straight line segment and the second straight line segment serve as two opposite sides of the U-shaped structure and are respectively inserted into two iron core grooves which are spaced by a preset distance; the bending section is S-shaped; the first straight line section and the second straight line section are arranged in adjacent layers of the iron core groove through the bending section; the utility model can effectively reduce the height of the end part of the flat wire.

Description

Technical Field

[0001] The utility model relates to the field of new energy motors, in particular to a flat wire motor, and in particular to a motor stator, in particular to a flat wire and a stator of the flat wire motor. Background Art

[0002] At present, new energy motors use flat wire motors. With the development of new energy, the performance requirements for flat wire motors are getting higher and higher. Existing flat wire motors use methods such as HAIR-PIN, and the end height is relatively high. The hairpin wire of the flat wire motor is V-shaped. The V-shaped forming structure is simple and the manufacturing process is simple, but it will further increase the height of the motor end, resulting in the inability to avoid mutual interference between copper wires when crossing the line. The mutual interference between the copper wires has to be solved by increasing the end height, which makes the overall end of the motor relatively high. Utility Model Content

[0003] The purpose of the present utility model is to provide a flat wire and a stator of a flat wire motor, so as to solve the problems pointed out in the above background technology.

[0004] In the first aspect, the utility model provides a flat wire, which is applied to the stator winding of a flat wire motor and is used in conjunction with the stator core of the flat wire motor. The stator core is provided with a plurality of evenly distributed core slots, and the flat wire includes: a first straight line segment, a first arc segment, a first sunken segment, a bent segment, a second sunken segment, a second arc segment and a second straight line segment connected in sequence; the first straight line segment, the first arc segment and the first sunken segment, and the second sunken segment, the second arc segment and the second straight line segment form a U-shaped structure with the bent segment as the center; wherein the first straight line segment and the second straight line segment serve as the opposite sides of the U-shaped structure; the bent segment is "S"-shaped; the first straight line segment and the second straight line segment are respectively used to be inserted into two of the core slots spaced a preset distance apart, And the first straight segment and the second straight segment are arranged in adjacent layers of the core slot through the bending segment; the axial direction of the stator core is defined as the up and down direction, and the direction of inserting the first straight segment into the core slot is defined as down; in the axial direction of the stator core, the height of the lowest point on the upper surface of the first sunken segment is lower than the height of the first target line segment, and the height of the lowest point on the upper surface of the second sunken segment is lower than the height of the second target line segment; the first target line segment is the connecting line between the upper end of the bending segment close to the end of the first arc segment and the upper end of the first arc segment close to the end of the first straight segment; the second target line segment is the connecting line between the upper end of the bending segment close to the end of the second arc segment and the upper end of the second arc segment close to the end of the second straight segment.

[0005] The present invention provides a novel flat wire structure. Through the design of the first sinking section and the second sinking section, when the flat wire is applied to the stator winding of the flat wire motor, the height of the end of the flat wire motor can be effectively reduced.

[0006] In an implementation of the first aspect, in the axial direction of the stator core, the height of the upper surface of the first sunken segment is lower than the height of the first target line segment, and the height of the upper surface of the second sunken segment is lower than the height of the second target line segment.

[0007] In an implementation of the first aspect, the first arc segment, the first sunken segment, the bent segment, the second sunken segment, and the second arc segment are inclined toward a side away from the axial direction of the stator core.

[0008] In an implementation manner of the first aspect, the first arc segment and the second arc segment are located on two coaxial curved surfaces, and a gap between the two coaxial curved surfaces meets a preset condition.

[0009] In this implementation, by setting the first arc segment and the second arc segment on two coaxial curved surfaces, and the gap between the two coaxial curved surfaces meets the preset conditions, it is ensured that the gap between adjacent first straight line segments or second straight line segments in the core slot is very small, thereby increasing the full slot rate of the core slot; at the same time, it can ensure a large gap at the bending section position, which facilitates the stamping process manufacturing of the flat wire.

[0010] In an implementation manner of the first aspect, the preset condition is greater than or equal to 0.2 mm.

[0011] In an implementation of the first aspect, any one or two or more combined angles of the following are obtuse angles: the angle formed by the line between the two ends of the first arc segment and the line between the two ends of the first sunken segment, the angle formed by the line between the two ends of the second arc segment and the line between the two ends of the second sunken segment, the angle formed by the line between the two ends of the first sunken segment and the line between the two ends of the curved segment, and the angle formed by the line between the two ends of the second sunken segment and the line between the two ends of the curved segment.

[0012] In this implementation, by making the aforementioned included angle an obtuse angle, damage to the flat wire can be reduced, thereby increasing the reliability of the flat wire.

[0013] In an implementation of the first aspect, the first straight line segment and the first arc segment are connected by a first transition segment; the second straight line segment and the second arc segment are connected by a second transition segment.

[0014] In a second aspect, the utility model provides a stator of a flat wire motor, the stator of the flat wire motor comprising: a stator winding and a stator core; the stator winding is arranged on the stator core; wherein the stator winding comprises a plurality of the above-mentioned flat wires; the stator winding is formed by stacking the flat wires layer by layer in the core slots of the stator core.

[0015] In an implementation of the second aspect, in the circumferential direction of the stator core, the layer where the bent section of the flat wire is located farthest from the axis of the stator core is defined as the outermost layer, and the layer where the bent section of the flat wire is located closest to the axis of the stator core is defined as the innermost layer; in the circumferential direction of the stator core, the inclination angles of the first arc segment, the first sunken segment, the bent segment, the second sunken segment and the second arc segment of the flat wire toward the side away from the axis of the stator core decrease successively from the outermost layer to the innermost layer.

[0016] In this implementation, by reducing the inclination angle layer by layer, the gap between the flat wires at the crossing position can be increased, thereby increasing the insulation safety distance, facilitating manufacturing, and improving the reliability of the flat wire motor.

[0017] In an implementation of the second aspect, in the circumferential direction of the stator core, two flat wires adjacent to one of the flat wires are defined as a first adjacent wire and a second adjacent wire respectively; the first arc segment and the first sunken segment of one of the flat wires are both located directly above the first arc segment and the first sunken segment of the first adjacent wire, and are both located directly below the first arc segment and the first sunken segment of the second adjacent wire; the second arc segment and the second sunken segment of one of the flat wires are both located directly below the second arc segment and the second sunken segment of the first adjacent wire, and are both located directly above the second arc segment and the second sunken segment of the second adjacent line.

[0018] In an implementation of the second aspect, in the circumferential direction of the stator core, the heights of the bent sections of any two adjacent rectangular wires are consistent.

[0019] In an implementation of the second aspect, in the circumferential direction of the stator core, the bent sections of any two adjacent rectangular wires are located on the same circumference.

[0020] In an implementation of the second aspect, in the circumferential direction of the stator core, the lowest point of a bent segment of the flat wire is higher than the highest point of the first arc segment or the second arc segment of an adjacent flat wire.

[0021] In this implementation, by ensuring that the lowest point of the bent section of a flat wire is higher than the highest point of the first arc section or the second arc section of the adjacent flat wire in the circumferential direction of the stator core, and by utilizing the concave first sinking section and the second sinking section of the flat wire, the interference distance between adjacent flat wires can be avoided. Since the ends of the flat wire do not interfere, the height of the entire flat wire can be reduced, thereby reducing the amount of flat wire manufacturing material, increasing the insulation gap, and the reliability of the flat wire motor stator, and facilitating manufacturing.

[0022] In an implementation of the second aspect, in the circumferential direction of the stator core, the minimum distance between the bent sections of any two adjacent flat wires in the radial direction of the stator core is greater than or equal to the gap between the two adjacent flat wires in the core slot in the radial direction of the stator core.

[0023] As described above, the flat wire and the stator of the flat wire motor described in the present invention have the following beneficial effects:

[0024] (1) Compared with the prior art, the present invention provides a U-shaped flat wire. Through the design of the first sinking section and the second sinking section, when the flat wire is applied to the stator winding of the flat wire motor, the height of the flat wire motor end can be effectively reduced.

[0025] (2) The utility model can improve the efficiency of the flat wire motor and enhance its motor performance by applying the stator of the flat wire motor provided by the utility model to the flat wire motor.

[0026] (3) The present invention can be applied to motors with smaller layout spaces.

[0027] (4) The utility model reduces the amount of materials used in flat wire manufacturing, thereby reducing manufacturing costs.

[0028] (5) The utility model reduces the overall volume and weight of the motor and increases the power density of the motor.

[0029] (6) The utility model reduces the wire used at the end of the flat wire motor, reduces the internal resistance of the flat wire, and reduces the heat generated at the end.

[0030] (7) The utility model reduces the gaps between the flat wires and is more suitable for heat dissipation of the flat wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Shown is a front view of the flat wire according to an embodiment of the present invention.

[0032] Figure 2 Shown is a side view of the flat wire according to an embodiment of the present invention.

[0033] Figure 3Shown is a schematic diagram of the partial structure of the flat wire according to an embodiment of the present utility model.

[0034] Figure 4 Shown is a schematic structural diagram of the flat wire according to an embodiment of the present utility model.

[0035] Figure 5 Shown is a partial stereoscopic view of the stator of the flat wire motor according to an embodiment of the present invention at a first viewing angle.

[0036] Figure 6 Shown is a partial stereoscopic view of the stator of the flat wire motor according to an embodiment of the present invention at a second viewing angle.

[0037] Figure 7 Display as Figure 5 Partial bottom view.

[0038] Figure 8 Display as Figure 5 Top view of .

[0039] Figure 9 The figure shows a comparison between the end height of the stator of the flat wire motor according to the embodiment of the present invention and the end height of the stator of the flat wire motor in the prior art.

[0040] Figure 10 Shown is a partial structural schematic diagram of the stator of the flat wire motor according to an embodiment of the present utility model.

[0041] Figure 11 Shown is a cross-sectional view of the core slot according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features within these embodiments may be combined with one another, unless they conflict.

[0043] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0044] HAIR-PIN refers to a technology that uses flat copper hairpin wire instead of traditional thin round wire in the stator winding of the drive motor. Because the coil of the stator winding is shaped like a hairpin, it is also called a hairpin motor or a flat wire motor.

[0045] The hairpin wire of the existing flat wire motor is V-shaped, and the V-shaped forming angle is large, which can easily cause damage to the copper wire paint film.

[0046] It should be noted that the motor ends have no effect. The ends are to ensure connection with the stator core ends and do not actually do any work. Moreover, due to current loss, heat generation will increase. Therefore, in order to further reduce the ineffective copper wire of the core, improve material utilization, reduce copper usage, increase motor efficiency, and improve motor performance, reducing the height of the motor ends has become an urgent problem to be solved.

[0047] See Figures 1 to 11 The following embodiments of the present invention provide a flat wire and a stator for a flat wire motor. Compared with the prior art, the present invention provides a flat wire with a U-shaped structure. Through the design of the first sinking section and the second sinking section, when the flat wire is applied to the stator winding of the flat wire motor, the height of the end of the flat wire motor can be effectively reduced; by applying the provided flat wire motor stator to the flat wire motor, the efficiency of the flat wire motor can be improved, and its motor performance can be enhanced; it can be suitable for motors with smaller layout spaces; the amount of flat wire manufacturing materials used is reduced, thereby reducing manufacturing costs; the overall volume and weight of the motor are reduced, and the power density of the motor is increased; the wire used at the end of the flat wire motor is reduced, the internal resistance of the flat wire is reduced, and the heat generation at the end is reduced; the gap between the flat wires is reduced, which is more suitable for the heat dissipation of the flat wire.

[0048] The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention.

[0049] In one embodiment, the present invention provides a flat wire 1 , which is applied to the stator winding of a flat wire motor and used in conjunction with a stator core 2 of the flat wire motor. The stator core 2 is provided with a plurality of evenly distributed core slots 3 .

[0050] like Figure 1 As shown, in one embodiment, the flat wire 1 includes: a first straight segment 101, a first arc segment 102, a first sunken segment 103, a curved segment 104, a second sunken segment 105, a second arc segment 106 and a second straight segment 107 connected in sequence.

[0051] Specifically, the first straight segment 101, the first arc segment 102 and the first sunken segment 103, the second sunken segment 105, the second arc segment 106 and the second straight segment 107 form a U-shaped structure with the curved segment 104 as the center; wherein the first straight segment 101 and the second straight segment 107 serve as the opposite sides of the U-shaped structure; the curved segment 104 is "S" shaped (such as Figure 3 shown).

[0052] It should be noted that, when the flat wire 1 is used, the first straight segment 101 and the second straight segment 107 are respectively used to be inserted into two core slots 3 spaced apart by a preset distance (e.g. Figure 5 and Figure 6 As shown), and the first straight segment 101 and the second straight segment 107 are arranged in adjacent layers of the core slot 3 through the bending segment 104.

[0053] like Figures 5 to 7 and Figure 11 As shown, the layer closest to the axis of the stator core 2 in the core slot 3 is defined as the first layer in the core slot 3 (corresponding to Figure 11 The Arabic numeral "1" in the stator core 2 is the nth layer in the core slot 3. Figure 11 In the example, n=6, corresponding to Figure 11 the Arabic numeral “6” in the middle).

[0054] like Figure 1 、 Figure 7 and Figure 11 As shown in the figure, the two black parts in the two core slots 3 pointed to by the numbers are one end of the first straight segment 101 and one end of the second straight segment 107 of a flat wire 1, respectively, and the structure in the core slot 3 between the two core slots 3 is a part of the bent section of the flat wire 1. Figure 7 As can be seen from the figure, the first straight segment 101 and the second straight segment 107 of the flat wire 1 are located in adjacent layers (the first layer and the second layer) of the core slot 3 .

[0055] In this embodiment, the axial direction of the stator core 2 is defined as the up-down direction, and the direction in which the first straight segment 101 is inserted into the core slot 3 is defined as down, and the direction opposite to the direction in which the first straight segment 101 is inserted into the core slot 3 is up.

[0056] In this embodiment, in the axial direction of the stator core 2, the lowest point on the upper surface of the first sinking section 103 (such as Figure 1 The height of the black dot on the left side of the middle is lower than the height of the first target line segment, and the lowest point on the upper surface of the second sinking segment 105 (such as Figure 1The height of the black dot on the right side of the image is lower than the height of the second target segment.

[0057] Specifically, the first target line segment is the connecting line between the upper end of the curved segment 104 close to the end of the first arc segment 102 and the upper end of the first arc segment 102 close to the end of the first straight line segment 101; the second target line segment is the connecting line between the upper end of the curved segment 104 close to the end of the second arc segment 106 and the upper end of the second arc segment 106 close to the end of the second straight line segment 107.

[0058] It should be noted that the above-mentioned design of the height of the first sinking section 103 and the second sinking section 105 is intended to sink the original connecting section between the bending section 104 and the first arc section 102 (connected in a line segment manner), and the original connecting section between the bending section 104 and the second arc section 106 (connected in a line segment manner), thereby reducing the height of the end of the flat wire 1.

[0059] It should be noted that the above-mentioned "n" represents the number of flat wires 1 contained in an iron core slot 3, which is a positive integer. However, the specific number is not a condition to limit the present invention. In actual application, it can be determined according to the specific application scenario.

[0060] In one embodiment, the preset distance is a preset number of core slots 3 .

[0061] It should be noted that the specific number of the "preset number" is not a condition to limit the present invention. In actual application, it can be determined according to the specific application scenario.

[0062] like Figure 5 and Figure 6 As shown, in one embodiment, the preset distance is five core slots 3 .

[0063] Specifically, the first straight segment 101 and the second straight segment 107 of a flat wire 1 are spaced apart by five core slots 3 .

[0064] In one embodiment, the flat wire 1 can be processed in a variety of ways; specifically, it can be processed by CNC, mold, or a combination thereof.

[0065] In one embodiment, the interior of the flat wire 1 is made of copper or a good conductor.

[0066] Among them, good conductors include at least but not limited to aluminum and alloys.

[0067] Specifically, the interior of the flat wire 1 is copper or a good conductor, and the outer surface of the flat wire 1 is one or more insulating layers wrapped around the outer surface of the copper or the good conductor.

[0068] In one embodiment, the insulator layer has the characteristics of wear resistance, insulation, and high temperature resistance.

[0069] In one embodiment, in the axial direction of the stator core 2 , the height of the upper surface of the first sunken section 103 is lower than the height of the first target line segment, and the height of the upper surface of the second sunken section 105 is lower than the height of the second target line segment.

[0070] like Figure 1 and Figure 2 As shown, in one embodiment, the first arc segment 102, the first sunken segment 103, the bent segment 104, the second sunken segment 105 and the second arc segment 106 are inclined toward a side away from the axis direction of the stator core 2, and the inclination angle is Figure 2 ∠a in.

[0071] In one embodiment, when the flat wire 1 is assembled on the stator core 2 , the first arc segment 102 , the first sunken segment 103 , the bent segment 104 , the second sunken segment 105 , and the second arc segment 106 of each flat wire 1 may be tilted at the same angle or at different angles away from the axis of the stator core 2 .

[0072] like Figure 3 As shown, in one embodiment, the first arc segment 102 and the second arc segment 106 are located on two coaxial curved surfaces (such as Figure 3 As shown, the radii of the two coaxial curved surfaces are R11 and R12 respectively, and the gap between the two coaxial curved surfaces meets the preset conditions.

[0073] In one embodiment, the preset condition is greater than or equal to 0.2 mm.

[0074] It should be noted that by locating the first arc segment 102 and the second arc segment 106 on two coaxial curved surfaces and ensuring that the gap between the two coaxial curved surfaces is ≥0.2 mm, the gap between two adjacent straight segments (the first straight segment 101 or the second straight segment 107) in an iron core slot 3 is ensured to be very small, thereby increasing the slot fill rate of the iron core slot 3. At the same time, the maximum gap at the position of the bending segment 104 can be guaranteed, which facilitates the stamping process manufacturing of the flat wire.

[0075] like Figure 4As shown, in one embodiment, any one or two or more combined angles of the following are obtuse angles: the angle β1 formed by the line between the two ends of the first arc segment 102 and the line between the two ends of the first sunken segment 103, the angle β4 formed by the line between the two ends of the second arc segment 106 and the line between the two ends of the second sunken segment 105, the angle β2 formed by the line between the two ends of the first sunken segment 103 and the line between the two ends of the curved segment 104, and the angle β3 formed by the line between the two ends of the second sunken segment 105 and the line between the two ends of the curved segment 104.

[0076] It should be noted that, in this embodiment, by making the aforementioned included angle an obtuse angle, damage to the flat wire is reduced (compared to the existing V-shaped flat wire), and the reliability of the flat wire is increased.

[0077] like Figure 1 and Figure 4 As shown, in one embodiment, the first straight line segment 101 and the first arc segment 102 are connected by a first transition segment 108 ; the second straight line segment 107 and the second arc segment 106 are connected by a second transition segment 109 .

[0078] It should be noted that, after the flat wire 1 is assembled with the stator core 2 , it can ensure that the conductors connected to each other are conductive, and the flat wires that do not need to be conductive are insulated and isolated from each other.

[0079] like Figure 9 As shown, the utility model provides a flat wire with a new structure, which effectively reduces the size of the flat wire end, thereby increasing the motor efficiency and reducing the motor material cost; wherein, Figure 9 The figure on the left is a partial structural diagram of the flat wire provided by the present invention applied to the stator of a flat wire motor; Figure 9 The figure on the right is a partial structural diagram of the stator of the flat wire motor in the prior art. Figure 9 It can be seen from the figure that after the flat wire provided by the present invention is applied to the stator of the flat wire motor, the end height is H; the end height of the stator of the flat wire motor in the prior art is H2; H is significantly smaller than H2.

[0080] like Figure 5 and Figure 6 As shown, in one embodiment, the utility model further provides a stator of a flat wire motor, the stator of the flat wire motor comprising: a stator winding and a stator core 2; the stator winding is arranged on the stator core 2; wherein, the stator winding comprises a plurality of the above-mentioned flat wires 1; the stator winding is formed by stacking the flat wires 1 layer by layer in the core slots 3 of the stator core 2.

[0081] like Figure 1 and Figure 8As shown, in one embodiment, in the circumferential direction of the stator core 2, the winding sections 104 of any two adjacent flat wires 1 are located on the same circumference (corresponding to Figure 8 dotted circle in the figure).

[0082] In one embodiment, in the circumferential direction of the stator core 2, the layer where the bent section 104 of the flat wire 1 is located farthest from the axis of the stator core 2 is defined as the outermost layer, and the layer where the bent section 104 of the flat wire 1 is located closest to the axis of the stator core 2 is defined as the innermost layer; in the circumferential direction of the stator core 2, the inclination angles of the first arc segment 102, the first sunken section 103, the bent section 104, the second sunken section 105 and the second arc segment 106 of the flat wire 1 toward the side away from the axis of the stator core 2 decrease successively from the outermost layer to the innermost layer.

[0083] It should be noted that if Figure 1 and Figure 8 As shown, in this embodiment, in the circumferential direction of the stator core 2, the bent sections 104 of any two adjacent flat wires 1 are on the same circumference; one circumference corresponds to one layer, the circumference farthest from the axis of the stator core 2 represents the outermost layer, and the circumference closest to the axis of the stator core 2 represents the innermost layer; in the stator core 2, by making the inclination angle of the flat wires in the outermost layer the largest and decreasing it successively along the number of layers, the inclination angle of the flat wires in the innermost layer is the smallest, so that the gap between the flat wires at the crossing position can be increased, thereby increasing the insulation safety distance between the flat wires, facilitating manufacturing and improving product reliability.

[0084] It is particularly noted that the layers in the "outermost layer" and "innermost layer" here are not the same layers as the layers in the above-mentioned "adjacent layers of the core slot 3" (including the above-mentioned 1st layer and nth layer); the layers in the "outermost layer" and "innermost layer" correspond to the layers where the bent segments 104 of the flat wire 1 are located, while the layers in the "adjacent layers of the core slot 3" correspond to the layers where the first straight segment 101 or the second straight segment 107 of the flat wire 1 is located.

[0085] like Figure 1 、 Figure 5 and Figure 6As shown, in one embodiment, in the circumferential direction of the stator core 2, two flat wires adjacent to the flat wire 1 are defined as the first adjacent wire and the second adjacent wire respectively; the first arc segment 102 and the first sunken segment 103 of the flat wire 1 are both located directly above the first arc segment 102 and the first sunken segment 103 of the first adjacent wire, and are both located directly below the first arc segment 102 and the first sunken segment 103 of the second adjacent wire; the second arc segment 106 and the second sunken segment 105 of the flat wire 1 are both located directly below the second arc segment 106 and the second sunken segment 105 of the first adjacent line, and are both located directly above the second arc segment 106 and the second sunken segment 105 of the second adjacent line.

[0086] In one embodiment, in the circumferential direction of the stator core 2 , the heights of the bent sections 104 of any two adjacent rectangular wires 1 are the same.

[0087] In one embodiment, in the circumferential direction of the stator core 2 , the lowest point of the bent segment 104 of the flat wire 1 is higher than the highest point of the first arc segment 102 or the second arc segment 106 of the adjacent flat wire 1 .

[0088] It should be noted that, in the circumferential direction of the stator core 2, by making the lowest point of the bent section 104 of a flat wire 1 higher than the highest point of the first arc section 102 or the second arc section 106 of the adjacent flat wire 1, and by making use of the first sinking section 103 and the second sinking section 105 of the flat wire 1 to be concave downward, the interference distance with the adjacent flat wires is avoided; since the ends do not interfere, the height of the entire flat wire 1 is reduced, thereby reducing the height of the flat wire ends (such as Figure 9 As shown in the figure, the amount of flat wire manufacturing materials is reduced, and the insulation gap between the flat wires is increased, which is beneficial to prolonging the life of the flat wire motor, increasing the reliability of the flat wire motor and facilitating manufacturing.

[0089] like Figure 1 、 Figure 5 and Figure 10 As shown, in one embodiment, in the circumferential direction of the stator core 2, the minimum distance t1 between the bent segments 104 of any two adjacent flat wires 1 in the radial direction of the stator core 2 is greater than or equal to the gap t2 between the two adjacent flat wires 1 in the core slots 3 in the radial direction of the stator core 2.

[0090] The descriptions of the processes or structures corresponding to the above figures have different emphases. For parts that are not described in detail in a certain process or structure, please refer to the relevant descriptions of other processes or structures.

[0091] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A flat wire, used for stator winding of a flat wire motor, used in conjunction with the stator core of the flat wire motor, wherein the stator core is provided with a plurality of evenly distributed core slots, characterized in that: The flat wire includes: a first straight line segment, a first arc segment, a first sunken segment, a curved segment, a second sunken segment, a second arc segment and a second straight line segment connected in sequence; the first straight line segment, the first arc segment and the first sunken segment, the second sunken segment, the second arc segment and the second straight line segment form a U-shaped structure with the curved segment as the center; wherein, The first straight line segment and the second straight line segment serve as two opposite sides of the U-shaped structure; The bending section is in an "S" shape; The first straight segment and the second straight segment are respectively used to be inserted into two of the core slots spaced apart by a preset distance, and the first straight segment and the second straight segment are arranged in adjacent layers of the core slots through the bending segment; The axial direction of the stator core is defined as the up-down direction, and the direction in which the first straight line segment is inserted into the core slot is defined as down; in the axial direction of the stator core, the height of the lowest point on the upper surface of the first sunken segment is lower than the height of the first target line segment, and the height of the lowest point on the upper surface of the second sunken segment is lower than the height of the second target line segment; the first target line segment is a connecting line between the upper end of the bent segment close to the end of the first arc segment and the upper end of the first arc segment close to the end of the first straight line segment; the second target line segment is a connecting line between the upper end of the bent segment close to the end of the second arc segment and the upper end of the second arc segment close to the end of the second straight line segment.

2. The flat wire according to claim 1, characterized in that In the axial direction of the stator core, the height of the upper surface of the first sunken segment is lower than the height of the first target line segment, and the height of the upper surface of the second sunken segment is lower than the height of the second target line segment.

3. The flat wire according to claim 1, wherein: The first arc segment, the first sunken segment, the bent segment, the second sunken segment, and the second arc segment are inclined toward a side away from the axial direction of the stator core.

4. The flat wire according to claim 1, wherein: The first arc segment and the second arc segment are located on two coaxial curved surfaces, and a gap between the two coaxial curved surfaces meets a preset condition.

5. The flat wire according to claim 4, characterized in that The preset condition is greater than or equal to 0.2 mm.

6. The flat wire according to claim 1, wherein: Any one or two or more of the following combined angles are obtuse angles: the angle between the line between the two ends of the first arc segment and the line between the two ends of the first sunken segment, the angle between the line between the two ends of the second arc segment and the line between the two ends of the second sunken segment, the angle between the line between the two ends of the first sunken segment and the line between the two ends of the curved segment, and the angle between the line between the two ends of the second sunken segment and the line between the two ends of the curved segment.

7. The flat wire according to claim 1, wherein: The first straight line segment and the first arc segment are connected via a first transition segment; the second straight line segment and the second arc segment are connected via a second transition segment.

8. A stator of a flat wire motor, characterized in that: The stator of the flat wire motor includes: a stator winding and a stator core; the stator winding is arranged on the stator core; wherein, The stator winding comprises a plurality of flat wires according to any one of claims 1 to 7; the stator winding is formed by stacking the flat wires one layer at a time in the core slots of the stator core.

9. The stator of the flat wire motor according to claim 8, characterized in that: In the circumferential direction of the stator core, the layer where the bent section of the flat wire is located farthest from the axis of the stator core is defined as the outermost layer, and the layer where the bent section of the flat wire is located closest to the axis of the stator core is defined as the innermost layer; in the circumferential direction of the stator core, the inclination angles of the first arc segment, the first sunken segment, the bent segment, the second sunken segment and the second arc segment of the flat wire toward the side away from the axis of the stator core decrease successively from the outermost layer to the innermost layer.

10. The stator of the flat wire motor according to claim 8, characterized in that: In the circumferential direction of the stator core, two flat wires adjacent to one of the flat wires are defined as the first adjacent line and the second adjacent line respectively; the first arc segment and the first sunken segment of one of the flat wires are both located directly above the first arc segment and the first sunken segment of the first adjacent line, and are both located directly below the first arc segment and the first sunken segment of the second adjacent line; the second arc segment and the second sunken segment of one of the flat wires are both located directly below the second arc segment and the second sunken segment of the first adjacent line, and are both located directly above the second arc segment and the second sunken segment of the second adjacent line.

11. The stator of the flat wire motor according to claim 8, characterized in that: In the circumferential direction of the stator core, the heights of the bent sections of any two adjacent rectangular wires are consistent.

12. The stator of the flat wire motor according to claim 8, characterized in that: In the circumferential direction of the stator core, the bent sections of any two adjacent rectangular wires are located on the same circumference.

13. The stator of the flat wire motor according to claim 8, characterized in that: In the circumferential direction of the stator core, the lowest point of a bent segment of the flat wire is higher than the highest point of the first arc segment or the second arc segment of the adjacent flat wire.

14. The stator of the flat wire motor according to claim 8, characterized in that: In the circumferential direction of the stator core, the minimum distance between the bent sections of any two adjacent flat wires in the radial direction of the stator core is greater than or equal to the gap between the two adjacent flat wires in the core slots in the radial direction of the stator core.

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