Wear-resistant enameled flat wire

Abstract

The utility model relates to the technical field of enameled wires, in particular to a wear-resistant enameled flat wire, which comprises a metal wire core and an insulating layer wrapped outside the metal wire core, the insulating layer comprises a bonding layer, a low dielectric layer and a wear-resistant layer which are sequentially distributed from inside to outside, the metal wire core is a copper flat wire core, and the metal wire core is a copper flat wire core. The bonding layer is coated on two side surfaces of the metal wire core in the thickness direction, the low dielectric layer is coated on the outer side of the bonding layer and two side surfaces of the metal wire core in the width direction, the wear-resistant layer is coated on the outer side of the low dielectric layer, and a film is arranged in the wear-resistant layer. According to the utility model, the low dielectric layer with a proper thickness is arranged in the middle, the enameled flat wire has high PDIV performance, and the defects that the enameled flat wire is not wear-resistant and is easy to scratch are improved; the wear-resistant layer and the thin film are arranged on the outer side of the low dielectric layer, so that the mechanical property of the enameled flat wire is improved, and the enameled flat wire has excellent wear resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of enameled wires, in particular to a wear-resistant enameled flat wire. Background Art

[0002] Enameled flat copper wire is a mainstream special-shaped wire used in the stators of new energy vehicle motors. Different working environments of motors have different requirements for the enameled wire used in motors. In current high-voltage motors, it is necessary to increase the partial discharge inception voltage value of the enameled wire, i.e., the PDIV value, so that the PDIV value of the enameled wire is higher than the overshoot voltage during motor operation to ensure that insulation loss does not occur due to partial discharge.

[0003] The enameled wire used in high-voltage motors usually adopts a bubble PI paint film with a low dielectric constant, because the PDIV and dielectric constant are inversely proportional, and the lower the dielectric constant, the higher the PDIV value. However, the inherent defect of bubble PI paint is that the mechanical properties are lower than those of ordinary PI paint, especially in terms of wear resistance. After the bubble PI paint is used in the enameled wire, it is easy to scratch the paint film during processing in the main engine factory. Usually, larger scratches and scratches can be manually identified, but some tiny and deeper scratches are difficult to identify in industrial production. Often when the problem is identified, such enameled wire has been processed into a stator, and the entire stator can only be scrapped, causing huge time and property losses, delaying the progress of the project.

[0004] The Chinese utility model patent with authorization announcement number CN217214235U discloses a wear-resistant and pressure-resistant enameled wire, including a copper wire and a buffer component. The enameled wire adopts a setting in which multiple components cooperate with each other, which can not only improve the pressure resistance of the enameled wire, but also improve the anti-static ability of the enameled wire, and also improve the wear resistance of the enameled wire. However, the structure of the enameled wire is complex, and the thickness of the insulation layer of the enameled wire is greatly increased. Utility Model Content

[0005] The utility model aims to provide a wear-resistant enameled flat wire to solve the problems raised in the background technology and improve the wear resistance of the enameled flat wire.

[0006] The above-mentioned purpose of the utility model is achieved through the following technical scheme: a wear-resistant enameled flat wire, comprising a metal wire core and an insulating layer wrapped around the outside of the metal wire core, the insulating layer comprising an adhesive layer, a low dielectric layer and a wear-resistant layer distributed in sequence from the inside to the outside, the metal wire core is a copper flat wire core, the adhesive layer is coated on two side surfaces in the thickness direction of the metal wire core, the low dielectric layer is coated on the outside of the adhesive layer and on two side surfaces in the width direction of the metal wire core, the wear-resistant layer is coated on the outside of the low dielectric layer, and a thin film is arranged inside the wear-resistant layer.

[0007] Preferably, the film is strip-shaped and wound around the metal wire core.

[0008] Preferably, there is a gap between two adjacent turns of the film during winding, and the width of the gap is smaller than the width of the film.

[0009] Preferably, through holes are provided on the film, and the through holes are distributed at intervals along the length direction.

[0010] Preferably, the through holes are round holes or long strip holes.

[0011] Preferably, the cross-section of the metal wire core is rectangular, and grooves are provided at four corners of the rectangle, and two ends of the adhesive layer are located in the grooves.

[0012] Preferably, the low dielectric layer is PI bubble paint, and the thickness of the low dielectric layer is greater than the thicknesses of the adhesive layer and the wear-resistant layer.

[0013] Advantages of the present utility model:

[0014] 1. In the present utility model, a low dielectric layer with a suitable thickness is placed in the middle. While using the enameled flat wire with high PDIV performance, the disadvantages of being not wear-resistant and easy to be scratched are improved.

[0015] 2. By providing a wear-resistant layer and a film outside the low dielectric layer, the mechanical properties of the enameled flat wire are improved, and it has excellent wear-resistant performance. Description of the drawings

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0017] Figure 2 is a cross-sectional view of an embodiment of the present utility model;

[0018] Figure 3 is a schematic diagram of the distribution of the film in an embodiment of the present utility model;

[0019] In the figure: 1 - metal wire core, 101 - groove, 2 - adhesive layer, 3 - low dielectric layer, 4 - wear-resistant layer, 5 - film, 501 - through hole, 6 - gap. Specific embodiments

[0020] The following further describes the present utility model in detail with reference to the drawings.

[0021] This specific embodiment is only an explanation of the present utility model, and it is not a limitation of the present utility model. After reading this specification, those skilled in the art can make modifications without creative contributions to this embodiment as needed, but as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.

[0022] Embodiment: As Figure 1 and Figure 2 shown, a wear-resistant enameled flat wire includes a metal wire core 1 and an insulating layer wrapped outside the metal wire core 1. The insulating layer includes an adhesive layer 2, a low-dielectric layer 3, and a wear-resistant layer 4 that are distributed in sequence from the inside to the outside. The metal wire core 1 is a copper flat wire core. The adhesive layer 2 is made of polyester imide paint, the low-dielectric layer 3 is made of bubble PI paint, and the wear-resistant layer 4 is made of insulating resin paint.

[0023] In this embodiment, the adhesive layer 2 is coated on two sides of the metal wire core 1 in the thickness direction. The low-dielectric layer 3 is coated outside the adhesive layer 2 and on two sides of the metal wire core 1 in the width direction. The wear-resistant layer 4 is coated outside the low-dielectric layer 3.

[0024] The cross-section of the metal wire core 1 is rectangular, and grooves 101 are provided at four corners of the rectangle. Both ends of the adhesive layer 2 are located in the grooves 101.

[0025] With the above structure, the problem of insufficient adhesion between the bubble PI paint and the copper flat wire core is improved, and the size of the enameled flat wire in the width direction is reduced.

[0026] A thin film 5 is provided in the wear-resistant layer 4, and the thin film 5 is made of polyimide film.

[0027] As Figure 3 shown, the thin film 5 is strip-shaped and wound around the metal wire core 1. There is a gap 6 between two adjacent turns of the thin film 5 during winding, and the width of the gap 6 is smaller than the width of the thin film 5.

[0028] Through holes 501 are provided on the thin film 5, and the through holes 501 are spaced along the length direction. The through holes 501 are round holes or long strip holes. In this embodiment, the through holes 501 are preferably round holes, so as to ensure that the wear-resistant layers 4 on both sides of the thin film 5 can be combined into one body and improve the strength of the wear-resistant layer 4.

[0029] The thickness of the low-dielectric layer 3 is greater than the thicknesses of the adhesive layer 2 and the wear-resistant layer 4, and the thickness of the wear-resistant layer 4 is greater than the thickness of the thin film 5.

[0030] In this embodiment, the thickness of the adhesive layer 2 is 0.01 mm, the thickness of the low-dielectric layer 3 is 0.025 mm, the width of the thin film 5 is 2 - 3 mm, the thickness is 0.0125 mm, and the total thickness of the wear-resistant layer 4 (including the thickness of the thin film 5) is 0.02 mm.

Claims

1. A wear-resistant enameled flat wire, comprising a metal wire core (1) and an insulating layer wrapped outside the metal wire core (1), characterized in that, The insulating layer includes an adhesive layer (2), a low-dielectric layer (3), and a wear-resistant layer (4) which are sequentially distributed from the inside to the outside. The metal wire core (1) is a flat copper wire core. The adhesive layer (2) covers two sides of the metal wire core (1) in the thickness direction. The low-dielectric layer (3) covers the outside of the adhesive layer (2) and two sides of the metal wire core (1) in the width direction. The wear-resistant layer (4) covers the outside of the low-dielectric layer (3), and a thin film (5) is arranged in the wear-resistant layer (4).

2. The abrasion-resistant enameled rectangular wire according to claim 1, wherein: The thin film (5) is strip-shaped and wound around the metal wire core (1).

3. The abrasion-resistant enameled rectangular wire according to claim 2, characterized in that: When the thin film (5) is wound, there is a gap (6) between two adjacent turns of the thin film (5) before and after, and the width of the gap (6) is smaller than the width of the thin film (5).

4. A wear-resistant enameled rectangular wire according to claim 2 or 3, characterized in that: Through holes (501) are arranged on the thin film (5), and the through holes (501) are distributed at intervals along the length direction.

5. The abrasion-resistant enameled rectangular wire according to claim 4, characterized in that: The through holes (501) are round holes or long strip holes.

6. A wear-resistant enameled rectangular wire according to claim 1, characterized in that: The cross-section of the metal wire core (1) is rectangular, and grooves (101) are arranged at four corners of the rectangle. Both ends of the adhesive layer (2) are located in the grooves (101).

7. A wear-resistant enameled rectangular wire according to claim 1, characterized in that: The low-dielectric layer (3) is a bubble PI paint, and the thickness of the low-dielectric layer (3) is greater than the thicknesses of the adhesive layer (2) and the wear-resistant layer (4).

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