Flat wire and stator of flat wire motor

Abstract

The invention 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 height of the end part of the flat wire can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of new energy motors, to flat wire motors, and particularly to motor stators, specifically a flat wire and a stator for a flat wire motor. Background Technology

[0002] Currently, 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, which result in a relatively high end height. In addition, 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 end height of the motor. This makes it impossible to avoid mutual interference between copper wires when crossing wires. The mutual interference between copper wires has to be solved by increasing the end height, which results in the overall end height of the motor being relatively high. Summary of the Invention

[0003] The purpose of this invention is to provide a flat wire and a stator for a flat wire motor to solve the problems mentioned in the background art.

[0004] In a first aspect, the present invention provides a flat wire used in the stator winding of a flat wire motor, in conjunction with the stator core of the flat wire motor. The stator core has multiple evenly distributed core slots. The flat wire includes: a first straight segment, a first arc segment, a first recessed segment, a bent segment, a second recessed segment, a second arc segment, and a second straight segment connected in sequence. The first straight segment, the first arc segment, and the first recessed segment, together with the second recessed segment, the second arc segment, and the second straight segment, form a U-shaped structure with the bent segment as the center. The first straight segment and the second straight segment serve as opposite sides of the U-shaped structure. The bent segment is S-shaped. The first straight segment and the second straight segment are respectively inserted into two core slots spaced at a predetermined distance. The first straight segment and the second straight segment are positioned in adjacent layers of the core slot through the bending section; the axial direction of the stator core is defined as the up-down direction, and the direction in which the first straight 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 sinking section 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 sinking section 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 section near the end of the first arc segment and the upper end of the first arc segment near the end of the first straight segment; the second target line segment is the connecting line between the upper end of the bending section near the end of the second arc segment and the upper end of the second arc segment near the end of the second straight segment.

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

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

[0007] In one implementation of the first aspect, the first arc segment, the first sinking segment, the bending segment, the second sinking segment, and the second arc segment are inclined to one side away from the axis of the stator core.

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

[0009] In this implementation, by setting the first and second arc segments to be located on two coaxial curved surfaces, and ensuring that the gap between the two coaxial curved surfaces meets the preset conditions, the gap between adjacent first or second straight segments in the core slot is very small, thereby increasing the fullness of the core slot; at the same time, it can also ensure a large gap at the bending section position, which is convenient for the stamping process of flat wire.

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

[0011] In one implementation of the first aspect, any one or two or more of the following angles are obtuse angles: the angle between the line connecting the two ends of the first arc segment and the line connecting the two ends of the first sinking segment; the angle between the line connecting the two ends of the second arc segment and the line connecting the two ends of the second sinking segment; the angle between the line connecting the two ends of the first sinking segment and the line connecting the two ends of the bending segment; and the angle between the line connecting the two ends of the second sinking segment and the line connecting the two ends of the bending segment.

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

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

[0014] Secondly, the present invention provides a stator for a flat wire motor, the stator comprising: a stator winding and a stator core; the stator winding is disposed on the stator core; wherein the stator winding comprises a plurality of the aforementioned flat wires; the stator winding is formed by stacking the flat wires layer by layer on the core slots of the stator core.

[0015] In one implementation of the second aspect, in the circumferential direction of the stator core, the layer furthest from the axis of the stator core where the bent section of the flat wire is located is defined as the outermost layer, and the layer closest to the axis of the stator core where the bent section of the flat wire is located is defined as the innermost layer; in the circumferential direction of the stator core, the inclination angle of the first arc segment, the first sinking segment, the bent segment, the second sinking segment, and the second arc segment of the flat wire inclines toward the side away from the axis of the stator core in sequence from the outermost layer to the innermost layer.

[0016] In this implementation, by gradually reducing the tilt angle layer by layer, the gap between the flat wires at the intersection can be increased, thereby increasing the insulation safety distance, which facilitates manufacturing and improves the reliability of the flat wire motor.

[0017] In one 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 recessed segment of one of the flat wires are both located directly above the first arc segment and the first recessed segment of the first adjacent wire, and both are located directly below the first arc segment and the first recessed segment of the second adjacent wire; the second arc segment and the second recessed segment of one of the flat wires are both located directly below the second arc segment and the second recessed segment of the first adjacent wire, and both are located directly above the second arc segment and the second recessed segment of the second adjacent wire.

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

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

[0020] In one implementation of the second aspect, in the circumferential direction of the stator core, the lowest point of the bend of one of the flat wires is higher than the highest point of the first or second arc segment of the 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 or second arc segment of the adjacent flat wire in the circumferential direction of the stator core, and by utilizing the concavity of the first and second recessed sections of the flat wire, interference distance between adjacent flat wires can be avoided. Since there is no interference at the ends of the flat wires, the overall height of the flat wire is reduced, thereby reducing the amount of material used in the flat wire manufacturing, increasing the insulation gap, improving the reliability of the flat wire motor stator, and facilitating manufacturing.

[0022] In one implementation of the second aspect, the minimum distance between the bent sections of any two adjacent flat wires in the circumferential direction of the stator core in the radial direction of the stator core is greater than or equal to the gap between 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 of 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 and second sinking sections, the end height of the flat wire motor can be effectively reduced when the flat wire is applied to the stator winding of the flat wire motor.

[0025] (2) By applying the stator of the flat wire motor provided by the present invention to the flat wire motor, the efficiency of the flat wire motor can be improved and its motor performance can be enhanced.

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

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

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

[0029] (6) The present invention reduces the amount of wire used at the end of the flat wire motor, reduces the internal resistance of the flat wire, and reduces the heat generation at the end.

[0030] (7) The present invention reduces the gap between flat wires, making it more suitable for heat dissipation of flat wires. Attached Figure Description

[0031] Figure 1 The image shown is a front view of the flat line described in an embodiment of the present invention.

[0032] Figure 2 The image shown is a side view of the flat line described in an embodiment of the present invention.

[0033] Figure 3 The diagram shown is a partial structural schematic of the flat wire described in an embodiment of the present invention.

[0034] Figure 4 The diagram shown is a structural schematic of the flat wire described in an embodiment of the present invention.

[0035] Figure 5 The image shown is a partial perspective view of the stator of the flat wire motor described in an embodiment of the present invention, viewed from a first perspective.

[0036] Figure 6 The image shown is a partial perspective view of the stator of the flat wire motor described in an embodiment of the present invention from a second perspective.

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

[0038] Figure 8 Displayed as Figure 5 Top view.

[0039] Figure 9 The diagram shows a comparison between the end height of the stator of the flat wire motor described in this embodiment of the invention and the end height of the stator of a flat wire motor in the prior art.

[0040] Figure 10 The diagram shown is a partial structural schematic of the stator of the flat wire motor according to an embodiment of the present invention.

[0041] Figure 11 The image shown is a cross-sectional view of the iron core slot as described in an embodiment of the present invention. Detailed Implementation

[0042] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

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

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

[0045] The hairpin wires of existing flat wire motors are V-shaped. The forming angle of the V-shape is large, which can easily lead to damage to the copper wire coating.

[0046] It should be noted that the motor end has no functional purpose. The end is only for ensuring connection with the stator core end and does not actually perform any work. Moreover, due to current loss, it will increase heat generation. Therefore, in order to further reduce the ineffective copper wire in the core, improve material utilization, reduce copper usage, increase motor efficiency, and improve motor performance, reducing the height of the motor end has become an urgent problem to be solved.

[0047] See Figures 1 to 11 The following embodiments of the present invention provide flat wire and a stator for a flat wire motor. Compared with the prior art, the present invention provides a U-shaped flat wire structure. Through the design of the first and second recessed sections, the height of the flat wire end of the motor can be effectively reduced when the flat wire is applied to the stator winding of the flat wire motor. 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 applied to motors with more limited space. The amount of flat wire manufacturing material 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 amount of wire used at the end of the flat wire motor is reduced, the internal resistance of the flat wire is reduced, and the end heat generation 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 of the present invention will now be described in detail with reference to the accompanying drawings.

[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 is used in conjunction with the stator core 2 of the flat wire motor. The stator core 2 is provided with a plurality of uniformly distributed core slots 3.

[0050] like Figure 1 As shown, in one embodiment, the flat line 1 includes: a first straight segment 101, a first arc segment 102, a first sunken segment 103, a bending 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, together with the second sunken segment 105, the second arc segment 106, and the second straight segment 107, form a U-shaped structure with the bending segment 104 as the center; wherein, the first straight segment 101 and the second straight segment 107 serve as opposite sides of the U-shaped structure; the bending segment 104 is S-shaped (e.g., Figure 3 (As 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 insert into the two core slots 3 spaced at 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 disposed in adjacent layers of the core groove 3 through the bending segment 104.

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

[0054] like Figure 1 , Figure 7 and Figure 11 As shown, the two black portions within the two core slots 3 indicated by the labels are one end of the first straight segment 101 and the second straight segment 107 of a flat wire 1, respectively. The structure within the core slot 3 between these two slots is part of the bent section of the flat wire 1. Figure 7 As can be seen from the image, 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. 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 recessed section 103 (e.g., Figure 1 The height of the black dot on the left side of the middle section is lower than the height of the first target line segment, and the lowest point of the upper surface of the second sunken segment 105 (such as...) Figure 1 The height of the black dot on the right side of the middle line is lower than the height of the second target line segment.

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

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

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

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

[0061] It should be noted that the specific number of "preset units" is not a limitation of the present invention. In practical applications, 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 iron core slots 3.

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

[0064] In one embodiment, the flat wire 1 can be processed in various 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, but are not limited to, aluminum and alloys.

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

[0068] In one embodiment, the insulating 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 sinking section 103 is lower than the height of the first target line segment, and the height of the upper surface of the second sinking section 105 is lower than the height of the second target line segment.

[0070] like Figure 1 and Figure 2As shown, in one embodiment, the first arc segment 102, the first sinking segment 103, the bending segment 104, the second sinking segment 105, and the second arc segment 106 are inclined towards a side away from the axis of the stator core 2, with an inclination angle of [insert angle here]. Figure 2 ∠a in the middle.

[0071] In one embodiment, when the flat wire 1 is assembled onto the stator core 2, the tilt angles of the first arc segment 102, the first sinking segment 103, the bending segment 104, the second sinking segment 105, and the second arc segment 106 of each flat wire 1 inclining away from the axis of the stator core 2 may be the same or different.

[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 (e.g., Figure 3 As shown, the radii of the two coaxial surfaces are R11 and R12 respectively, and the gap between the two coaxial surfaces satisfies 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 placing 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 ≥0.2mm, the gap between two adjacent straight segments (the first straight segment 101 or the second straight segment 107) within a core slot 3 is very small, thereby increasing the slot fill factor of the core slot 3. At the same time, it can also ensure the maximum gap at the position of the bending segment 104, which is convenient for the stamping process of flat wire.

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

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

[0077] like Figure 1 and Figure 4As 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 all interconnected conductors are conductive, while the flat wires that do not need to be conductive are insulated from each other.

[0079] like Figure 9 As shown, this invention provides a novel flat wire structure that effectively reduces the end dimensions of the flat wire, thereby increasing motor efficiency and reducing motor material costs; wherein, Figure 9 The figure on the left is a partial structural diagram of the stator of a flat wire motor provided by the present invention. Figure 9 The diagram on the right is a partial structural diagram of the stator of a flat wire motor in the prior art. Figure 9 As can be seen from the above, the flat wire provided by the present invention, when applied to the stator of a flat wire motor, has an end height of H; the end height of the stator of a 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 present invention also provides a stator for a flat wire motor, the stator of the flat wire motor comprising: a stator winding and a stator core 2; the stator winding is disposed on the stator core 2; wherein the stator winding comprises multiple flat wires 1 as described above; the stator winding is formed by stacking the flat wires 1 layer by layer on the core slots 3 of the stator core 2.

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

[0082] In one embodiment, in the circumferential direction of the stator core 2, the layer where the bending section 104 of the flat wire 1 is located furthest from the axis of the stator core 2 is defined as the outermost layer, and the layer where the bending 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 angle of the first arc segment 102, the first sinking segment 103, the bending segment 104, the second sinking segment 105, and the second arc segment 106 of the flat wire 1 tilts toward the side away from the axis of the stator core 2 decreases sequentially from the outermost layer to the innermost layer.

[0083] It should be noted that, as Figure 1 and Figure 8 As shown in this embodiment, in the circumferential direction of the stator core 2, the bending segments 104 of any two adjacent flat wires 1 are on the same circumference; one circumference corresponds to one layer, the circumference furthest 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 tilt angle of the outermost flat wire the largest and decreasing sequentially along the layers, and the tilt angle of the innermost flat wire the smallest, the gap between the flat wires at the crossing position can be increased, thereby increasing the insulation safety distance between the flat wires, which facilitates manufacturing and product reliability.

[0084] It should be noted that the layers referred to as "outermost layer" and "innermost layer" here are not the same as the layers in the "adjacent layers of the core groove 3" (including the first and nth layers mentioned above); the layers in "outermost layer" and "innermost layer" correspond to the layers where the bending section 104 of the flat wire 1 is located, while the layers in the "adjacent layers of the core groove 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 6 As shown, in one embodiment, in the circumferential direction of the stator core 2, two flat wires adjacent to a flat wire 1 are respectively defined as the first adjacent line and the second adjacent line; the first arc segment 102 and the first recessed segment 103 of the flat wire 1 are both located directly above the first arc segment 102 and the first recessed segment 103 of the first adjacent line, and both are located directly below the first arc segment 102 and the first recessed segment 103 of the second adjacent line; the second arc segment 106 and the second recessed segment 105 of the flat wire 1 are both located directly below the second arc segment 106 and the second recessed segment 105 of the first adjacent line, and both are located directly above the second arc segment 106 and the second recessed segment 105 of the second adjacent line.

[0086] In one embodiment, the height of the bending segment 104 of any two adjacent flat wires 1 is the same in the circumferential direction of the stator core 2.

[0087] In one embodiment, in the circumferential direction of the stator core 2, the lowest point of the bending segment 104 of one of the flat wires 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 simultaneously utilizing the downward concavity of the first and second downward sections 103 and 105 of the flat wire 1, interference distance with adjacent flat wires is avoided; since there is no interference at the ends, the overall height of the flat wire 1 is reduced, thereby reducing the height of the flat wire ends (as shown in the image). Figure 9 As shown, reducing the amount of material used in flat wire manufacturing and increasing the insulation gap between flat wires helps to increase the lifespan of flat wire motors, improves their reliability, and facilitates 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 any two adjacent flat wires 1 bending segments 104 in the radial direction of the stator core 2 is greater than or equal to the gap t2 between two adjacent flat wires 1 in the core slot 3 in the radial direction of the stator core 2.

[0090] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, 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 invention. Any person skilled in the art can 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 those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A flat wire, used in the stator winding of a flat wire motor, and in conjunction with the stator core of the flat wire motor, wherein the stator core has a plurality of evenly distributed core slots, characterized in that, The flat wire comprises: a first straight segment, a first arc segment, a first sunken segment, a bent segment, a second sunken segment, a second arc segment, and a second straight segment connected sequentially; the first straight segment, the first arc segment, and the first sunken segment, together with the second sunken segment, the second arc segment, and the second straight segment, form a U-shaped structure with the bent segment as the center; wherein... The first straight segment and the second straight segment serve as the two opposite sides of the U-shaped structure; The bent section is S-shaped; The first straight segment and the second straight segment are respectively used to insert into the two iron core slots with a preset distance between them, and the first straight segment and the second straight segment are arranged in adjacent layers of the iron 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 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 sinking 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 sinking 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 near the end of the first arc segment and the upper end of the first arc segment near the end of the first straight segment; the second target line segment is the connecting line between the upper end of the bending segment near the end of the second arc segment and the upper end of the second arc segment near the end of the second straight 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 sinking section is lower than the height of the first target line segment, and the height of the upper surface of the second sinking section is lower than the height of the second target line segment.

3. The flat wire according to claim 1, characterized in that, The first arc segment, the first sinking segment, the bending segment, the second sinking segment, and the second arc segment are inclined to the side away from the axis of the stator core.

4. The flat wire according to claim 1, characterized in that, The first arc segment and the second arc segment are located on two coaxial curved surfaces, and the 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, characterized in that, The following angles, or any combination of two or more, are obtuse angles: the angle between the line connecting the two ends of the first arc segment and the line connecting the two ends of the first sinking segment; the angle between the line connecting the two ends of the second arc segment and the line connecting the two ends of the second sinking segment; the angle between the line connecting the two ends of the first sinking segment and the line connecting the two ends of the bending segment; and the angle between the line connecting the two ends of the second sinking segment and the line connecting the two ends of the bending segment.

7. The flat wire according to claim 1, characterized in that, The first straight line segment and the first circular arc segment are connected by a first transition segment; the second straight line segment and the second circular arc segment are connected by a second transition segment.

8. A stator for 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 disposed on the stator core; wherein, The stator winding comprises a plurality of flat wires as described in any one of claims 1 to 7; the stator winding is formed by stacking the flat wires one layer on top of each other 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 furthest 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 angle of the first arc segment, the first sinking segment, the bent segment, the second sinking segment, and the second arc segment of the flat wire inclines toward the side away from the axis of the stator core in sequence 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 wire and the second adjacent wire, respectively; the first arc segment and the first recessed segment of the flat wire are both located directly above the first arc segment and the first recessed segment of the first adjacent wire, and both are located directly below the first arc segment and the first recessed segment of the second adjacent wire; the second arc segment and the second recessed segment of the flat wire are both located directly below the second arc segment and the second recessed segment of the first adjacent wire, and both are located directly above the second arc segment and the second recessed segment of the second adjacent wire.

11. The stator of the flat wire motor according to claim 8, characterized in that, In the circumferential direction of the stator core, the bending sections of any two adjacent flat wires have the same height.

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 flat 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 the bend of one of the flat wires is higher than the highest point of the first or 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 two adjacent flat wires in the core slot in the radial direction of the stator core.

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