Self-lubricating enameled wire

Abstract

The utility model provides a self-lubricating enameled wire, and belongs to the technical field of cables. The self-lubricating enameled wire comprises a metal core wire, a primer layer is coated outside the metal core wire, a surface paint layer is coated outside the primer layer, a self-lubricating layer is coated outside the surface paint layer, and the thickness of the self-lubricating layer is 0.002-0.004 mm. According to the enameled wire, through the arrangement of the self-lubricating layer, the friction coefficient of the enameled wire in the use process is remarkably reduced, the lubricity and wear resistance of the enameled wire are improved, and the service life of the enameled wire can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field especially relates to a self-lubricating enameled wire. BACKGROUND

[0002] In the use of compressor, the performance requirement of enameled copper round wire is extremely strict, and the 200-grade polyamide-imide composite polyester or polyester-imide enameled copper round wire is widely applied due to its excellent performance in heat resistance, mechanical property and chemical property. With the continuous progress of technology, the compressor manufacturers vigorously promote high-speed winding equipment, which puts forward higher requirements for the winding performance of enameled wire, and the enameled wire needs to have good self-lubricating property to adapt to the high-speed winding process. At the same time, the influence of environmental protection factor in industrial production is increasing, and the type of stator impregnating varnish has also undergone a major change. The traditional solvent type impregnating varnish is gradually replaced by water-based impregnating varnish which is more friendly to the environment due to its greater pollution to the environment. However, a key problem is exposed in the application process of water-based impregnating varnish, that is, the adhesion between the water-based impregnating varnish and the usual self-lubricating copper round enameled wire is much lower than that of the solvent type impregnating varnish, which is difficult to meet the actual production demand, and this contradiction seriously restricts the further development of the compressor industry.

[0003] Therefore, it is necessary to improve the existing self-lubricating enameled wire to overcome the defects of the prior art. CONTENT OF THE UTILITY MODEL

[0004] In order to overcome the problems in the related art, the purpose of the utility model is to provide a self-lubricating enameled wire, which significantly reduces the friction coefficient of the enameled wire in the use process by setting a self-lubricating layer, increases the lubricity and wear resistance of the enameled wire, and can prolong the service life of the enameled wire.

[0005] A self-lubricating enameled wire, comprising a metal core wire, the metal core wire is coated with a primer layer, the primer layer is coated with a finish layer, and the finish layer is coated with a self-lubricating layer, and the thickness of the self-lubricating layer is 0.002mm-0.004mm.

[0006] The enameled wire can improve the strength and toughness of the enameled wire through the primer layer and the finish layer, so that it can withstand certain mechanical external force without breaking or falling off the paint film, ensure that the enameled wire can maintain good mechanical integrity, and ensure the stability of electrical performance. The setting of the self-lubricating layer reduces the friction coefficient of the enameled wire in the use process. In the high-speed winding equipment, the friction between the enameled wire and the winding equipment parts is reduced, not only reducing the wear of the surface of the enameled wire, but also prolonging the service life of the enameled wire, and reducing the energy consumption in the winding process and improving the production efficiency.

[0007] In the preferable technical scheme of the utility model, the primer layer comprises polyester imine, the topcoat layer comprises polyamide imide, and the self-lubricating layer comprises self-lubricating polyamide imide.

[0008] The polyester imine of the primer layer and the polyamide imide of the topcoat layer each have a high heat resistance index, and can maintain stable physical and chemical properties in a high-temperature environment. When the enameled wire is applied to equipment such as motors and transformers, even if the equipment generates a large amount of heat during long-time operation, the enamel film of the enameled wire will not easily soften, break down or fall off, effectively ensuring the safe and stable operation of the equipment and prolonging the service life of the equipment.

[0009] In the application scenario of water-based impregnating paint, the self-lubricating polyamide imide as the outermost self-lubricating layer of the enameled wire, coated by a specific process (thickness about 0.002-0.004mm), helps to improve the adhesion of the enameled wire to the water-based impregnating paint. Compared with traditional self-lubricating materials or coatings, it can better adapt to the characteristics of water-based impregnating paint, so that the enameled wire forms a tighter and more secure bond with the water-based impregnating paint during the impregnation process, ensuring the insulation performance and overall performance of the motor stator and other components after impregnation treatment.

[0010] In the preferable technical scheme of the utility model, the polyester imine of the primer layer accounts for 60%-70%.

[0011] In the preferable technical scheme of the utility model, the heat resistance index of the polyester imine of the primer layer is greater than 200, and the primer layer is formed by 10-14 coating and drying processes.

[0012] By controlling the proportion of polyester imine in the primer layer to be 60%-70%, the application effectively balances the material cost while ensuring good performance of the primer layer. Compared with the use of a higher proportion of polyester imine, the raw material procurement cost can be reduced, the production efficiency can be improved, and the product has a cost advantage in market competition without sacrificing the key performance of the enameled wire. Since the heat resistance index of the polyester imine is greater than 200, and the primer layer is formed by multiple coating and drying processes, the primer layer can form a dense enamel film structure, greatly enhancing the heat resistance of the enameled wire.

[0013] In the preferable technical scheme of the utility model, the polyamide imide of the topcoat layer accounts for 30%-40%.

[0014] In the preferable technical scheme of the utility model, the heat resistance index of the polyamide imide of the topcoat layer is greater than 220, and the primer layer is formed by 5-8 coating and drying processes.

[0015] The proportion of the polyamide-imide in the surface paint layer is controlled at 30%-40%, which can fully play the excellent heat resistance and chemical properties, and can reasonably control the material cost.

[0016] Since the heat resistance index of the polyamide-imide is greater than 220, and the surface paint layer structure formed through 5-8 coating and drying processes is dense, the heat resistance of the enameled wire is greatly enhanced.

[0017] In the preferable technical scheme of the utility model, the total thickness of the primer layer, the surface paint layer and the self-lubricating layer is 0.03mm-0.08mm.

[0018] The total thickness of the paint layer designed in the application is in the range of 0.03mm-0.08mm, which can provide good electrical insulation protection for the metal core wire. In electrical equipment, the enameled wire serves as an insulation layer of a conductive component, and this thickness can effectively prevent current leakage, ensure the electrical safety and stability of the equipment, reduce the risk of short circuit, electric leakage and other faults caused by poor insulation, and improve the reliability and service life of the equipment.

[0019] Moreover, the total thickness of the paint layer is in the range of 0.03mm-0.08mm, which avoids material waste and cost increase caused by too thick paint layer, and also prevents the problem of not meeting the performance requirements caused by too thin paint layer

[0020] In the preferable technical scheme of the utility model, the thickness ratio of the primer layer to the surface paint layer is 3:2-5:4.

[0021] The thickness ratio of the primer layer to the surface paint layer in the application is between 3:2-5:4, which can make the performance advantages of the two kinds of paint layer materials fully play and synergize. The polyester-imide primer layer lays a foundation for the enameled wire with good adhesion and certain heat resistance, and the polyamide-imide surface paint layer provides outer protection with excellent heat resistance and chemical properties, and the two form a tightly combined structure at a certain thickness ratio, which effectively improves the overall heat resistance, mechanical strength and chemical stability of the enameled wire.

[0022] The utility model has the advantages of:

[0023] The utility model provides a kind of self-lubricating enameled wire, the self-lubricating enameled wire includes metal core wire, metal core wire is covered with primer layer, primer layer is covered with surface varnish layer, surface varnish layer is covered with self-lubricating layer, the thickness of self-lubricating layer is 0.002mm-0.004mm.The enameled wire can improve enameled wire strength and tenacity by primer layer and surface varnish layer, so that certain mechanical external force can be withstood without paint film rupture or peeling, ensure that enameled wire can keep good mechanical integrity, ensure the stability of electrical performance.The setting of self-lubricating layer reduces the friction coefficient of enameled wire in use process.In high-speed winding equipment, the friction between enameled wire and winding equipment component reduces, not only reduces the abrasion of enameled wire surface, improves the service life of enameled wire, but also can reduce the energy consumption in winding process, improve production efficiency.Self-lubricating layer thickness is between 0.002mm-0.004mm, enough lubricating effect can be guaranteed, and other properties of enameled wire or unnecessary cost cannot be affected due to over-thickness. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the schematic diagram of the self-lubricating enameled wire provided in the embodiment of the utility model;

[0025] Figure 2 It is the schematic diagram of the self-lubricating enameled wire including connecting grid provided in the embodiment of the utility model;

[0026] Figure 3 It is the flow chart of the preparation method of the self-lubricating enameled wire provided in the embodiment of the utility model.

[0027] REFERENCE SIGNS:

[0028] 1, metal core wire;2, primer layer;3, surface varnish layer;4, self-lubricating layer;5, connecting grid; DETAILED DESCRIPTION

[0029] Preferred embodiments of the utility model will be described in more detail below with reference to the drawings. Although the preferred embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be implemented in various forms and should not be limited by the embodiments described here. On the contrary, these embodiments are provided to make the utility model more thorough and complete, and to convey the scope of the utility model to the skilled in the art completely.

[0030] In the compressor use, the performance requirements of the enameled copper round wire are extremely strict, and the 200-grade polyamide-imide composite polyester or polyester-imide enameled copper round wire is widely used because of its excellent performance in heat resistance, mechanical properties, chemical properties and the like. With the continuous progress of technology, the compressor manufacturers vigorously promote high-speed winding equipment, which puts forward higher requirements for the winding performance of the enameled wire, and the enameled wire needs to have good self-lubricating property to adapt to the high-speed winding process. At the same time, the influence of environmental protection factors on industrial production is increasing, and the type of stator dipping paint has also undergone a major change. The traditional solvent-based dipping paint is gradually being replaced by water-based dipping paint which is more friendly to the environment. However, a key problem is exposed in the application process of the water-based dipping paint, that is, the adhesion between the water-based dipping paint and the usual self-lubricating copper round enameled wire is much lower than that of the solvent-based dipping paint, which is difficult to meet the actual production needs, and this contradiction seriously restricts the further development of the compressor industry.

[0031] Based on this, the application provides a kind of self-lubricating enameled wire.

[0032] Embodiment 1

[0033] Referring to Figures 1-2 , the embodiment provides a kind of self-lubricating enameled wire, including metal core wire 1, the metal core wire 1 is coated with primer layer 2, the primer layer 2 is coated with finish paint layer 3, the finish paint layer 3 is coated with self-lubricating layer 4, the thickness of the self-lubricating layer 4 is 0.002mm-0.004mm.

[0034] The enameled wire can improve the strength and toughness of the enameled wire through the primer layer 2 and the finish paint layer 3, so that it can withstand certain mechanical external force without paint film rupture or falling off, ensuring that the enameled wire can maintain good mechanical integrity and ensure the stability of electrical performance. The setting of the self-lubricating layer 4 reduces the friction coefficient of the enameled wire during use. In high-speed winding equipment, the friction between the enameled wire and the winding equipment parts is reduced, not only reducing the wear of the surface of the enameled wire, but also improving the service life of the enameled wire, and reducing the energy consumption in the winding process and improving the production efficiency.

[0035] The thickness of the self-lubricating layer 4 is between 0.002mm-0.004mm, which can not only ensure sufficient lubricating effect, but also will not affect other properties of the enameled wire or increase unnecessary cost due to excessive thickness.

[0036] Specifically, the material of the self-lubricating layer 4 in the embodiment can be any one of polyester-imide, polyester, polyamide-imide, polytetrafluoroethylene or polyimide.

[0037] Embodiment 2

[0038] This embodiment is optimized on the basis of embodiment 1.

[0039] Referring to Figures 1-2 In this embodiment, the primer layer 2 comprises polyester imide, the topcoat layer 3 comprises polyamide-imide, and the self-lubricating layer 4 comprises self-lubricating polyamide-imide.

[0040] The polyester imide of the primer layer 2 and the polyamide-imide of the topcoat layer 3 each have a high heat resistance index, and can maintain stable physical and chemical properties in a high-temperature environment. When the enameled wire is applied to equipment such as motors and transformers, even if the equipment generates a large amount of heat during long-time operation, the enamel film of the enameled wire will not easily soften, break down, or fall off, effectively ensuring the safe and stable operation of the equipment and prolonging the service life of the equipment.

[0041] In the application scenario of water-based impregnating paint, the self-lubricating polyamide-imide as the outermost self-lubricating layer of the enameled wire, coated by a specific process (thickness about 0.002-0.004 mm), helps to improve the adhesion of the enameled wire to the water-based impregnating paint. Compared with traditional self-lubricating materials or coatings, it can better adapt to the characteristics of water-based impregnating paint, enabling the enameled wire to form a tighter and more secure bond with the water-based impregnating paint during the impregnation process, ensuring the insulation performance and overall performance stability of components such as motor stators after impregnation treatment.

[0042] Embodiment 3

[0043] This embodiment is an improvement based on Embodiment 2.

[0044] Referring to Figures 1-2 Specifically, in this embodiment, the polyester imide of the primer layer 2 accounts for 60%-70%.

[0045] In this embodiment, the heat resistance index of the polyester imide of the primer layer 2 is greater than 200, and the primer layer 2 is formed by 10-14 coating and drying processes.

[0046] By controlling the proportion of polyester imide in the primer layer 2 to be 60%-70%, the present application effectively balances the material cost while ensuring good performance of the primer layer 2. Compared with the use of a higher proportion of polyester imide, it can reduce the raw material procurement cost and improve production efficiency, giving the product a cost advantage in market competition without sacrificing the key performance of the enameled wire. Since the heat resistance index of the polyester imide is greater than 200, and the primer layer 2 is formed by multiple coating and drying processes, it can form a dense enamel film structure, greatly enhancing the heat resistance of the enameled wire.

[0047] Moreover, the coating and drying process of 10-14 passes forms a tight bond between the primer layer 2 and the metal core wire 1, enhancing the mechanical stability of the enameled wire. During the winding, installation and use of the enameled wire, it can withstand certain mechanical stress such as bending, stretching, etc., without the paint film peeling off or being damaged. This not only improves the processing efficiency and product quality during production, reduces the scrap rate, but also ensures the reliability of the enameled wire during long-term operation of the equipment, maintaining stable electrical performance.

[0048] More specifically, in the primer layer 2, in addition to the polyester imine, a small amount of coupling agent is also included. The coupling agent can form a chemical bond or physical adsorption between the polyester imine and the metal surface, improving the interface bonding state between the two, so that the primer layer 2 is more firmly attached to the metal core wire 1.

[0049] Example 4

[0050] This embodiment is an improvement based on Example 2.

[0051] Referring to Figures 1-2 In this embodiment, the polyamide-imide in the topcoat layer 3 accounts for 30%-40%.

[0052] More preferably, in this embodiment, the heat resistance index of the polyamide-imide in the topcoat layer 3 is greater than 220, and the primer layer 2 is formed by 5-8 coating and drying processes.

[0053] Controlling the proportion of polyamide-imide in the topcoat layer 3 to 30%-40% can fully exert its excellent heat resistance and chemical properties, and reasonably control the material cost. Compared with the use of a higher proportion of polyamide-imide, the overall performance of the enameled wire is not reduced, the raw material procurement cost is reduced, and the market competitiveness of the product is improved.

[0054] Since the heat resistance index of the polyamide-imide is greater than 220, and the topcoat layer 3 structure formed by 5-8 coating and drying processes is dense, the heat resistance of the enameled wire is greatly enhanced.

[0055] Example 5

[0056] This embodiment is an improvement based on Example 2.

[0057] In this embodiment, the total thickness of the primer layer 2, the topcoat layer 3 and the self-lubricating layer 4 is 0.03-0.08mm.

[0058] The total thickness of the paint layer in the application is in the range of 0.03mm-0.08mm, which can provide good electrical insulation protection for the metal core wire 1. In electrical equipment, the enameled wire serves as the insulation layer of the conductive part. This thickness can effectively prevent current leakage, ensure the electrical safety and stability of the equipment, reduce the risk of short circuit, electric leakage and other faults caused by poor insulation, and improve the reliability and service life of the equipment.

[0059] Moreover, the total thickness of the paint layer is in the range of 0.03mm-0.08mm, which avoids material waste and cost increase caused by excessive thickness of the paint layer, and also prevents the problem of insufficient performance caused by too thin paint layer

[0060] More preferably, in the present embodiment, the ratio of the thickness of the primer layer 2 to the topcoat layer 3 is 3:2-5:4.

[0061] The thickness ratio of the primer layer 2 to the topcoat layer 3 in the application is between 3:2-5:4, which can fully exert the performance advantages of the two kinds of paint layers and synergize with each other. The polyester-imide primer layer 2 lays the foundation for the enameled wire with good adhesion and certain heat resistance, and the polyamide-imide topcoat layer 3 provides outer protection with excellent heat and chemical resistance. The two form a tightly combined structure under a certain thickness ratio, effectively improving the overall heat resistance, mechanical strength and chemical stability of the enameled wire.

[0062] In a more preferred embodiment, a connecting mesh 5 is further arranged between the primer layer 2 and the topcoat layer 3, which extends from the inside to the outside along the radial direction of the metal core wire 1.

[0063] Specifically, the connecting mesh 5 can be made of high-strength, high-temperature-resistant and chemically stable metal or alloy fibers, such as stainless steel fibers or nickel-based alloy fibers. The appropriate fiber length and weaving method are determined according to the size and performance requirements of the enameled wire to form a connecting mesh 5 with good mechanical properties and thermal conductivity.

[0064] During preparation, the pre-prepared connecting mesh 5 is carefully installed and fixed in the appropriate position on the surface of the cured primer layer 2 using auxiliary devices, ensuring that the connecting mesh 5 extends from the inside to the outside along the radial direction of the metal core wire 1 and is evenly distributed, and has good contact and combination with the primer layer 2, which can effectively transfer stress and heat.

[0065] The presence of the connecting web 5 significantly improves the mechanical strength and toughness of the enameled wire. When the enameled wire is subjected to mechanical stress such as bending, stretching, twisting, etc., the connecting web 5 can effectively disperse the stress and prevent damage such as cracking and peeling of the enamel film, thereby improving the reliability and stability of the enameled wire in complex mechanical environments. For example, during the winding and installation of the motor winding, the enameled wire needs to withstand a certain mechanical operating force, at which time the connecting web 5 can effectively protect the enamel layer structure and reduce the risk of electrical performance degradation and failure caused by mechanical damage.

[0066] Example 6

[0067] The present embodiment provides a preparation method of a self-lubricating enameled wire, which is used for preparing the self-lubricating enameled wire as described above.

[0068] Referring to Figures 1-3 , specifically, the method comprises the following steps:

[0069] The method comprises the following steps:

[0070] S100, obtaining a metal core wire 1;

[0071] S200, coating multiple layers of polyester imine on the metal core wire 1 and drying to form a primer layer 2;

[0072] Specifically, during the polyester imine coating process, 10-14 layers of polyester imine are coated and dried to produce the final layer of polyester imine, and then the last layer of polyester imine is sent to an oven for curing at 600-630°C;

[0073] S300, coating multiple layers of polyamide imide on the primer layer 2 and drying to form a topcoat layer 3;

[0074] During the polyamide imide coating process, 5-8 layers of polyamide imide are coated and dried to produce the final layer of polyamide imide, and then the last layer of polyamide imide is sent to an oven for curing at 600-630°C;

[0075] S400, coating multiple layers of self-lubricating polyamide imide on the topcoat layer 3 and drying to form a self-lubricating layer 4;

[0076] During the self-lubricating polyamide imide coating process, 1 layer of self-lubricating polyamide imide is coated and cured at 600-630°C.

[0077] A lubricant is coated on the cured self-lubricating layer 4.

[0078] Specifically, the preparation method of the self-lubricating enameled wire of the present application is as follows:

[0079] I. Material preparation process:

[0080] Obtaining metal core wire 1: select high-quality copper material with a diameter of 10 mm, after fine drawing and annealing treatment, to ensure smooth surface, no impurities and good electrical conductivity and flexibility, to provide a solid foundation for subsequent paint layer coating.

[0081] Primer layer 2 material: polyester imide, wherein the proportion of polyester imide is 60%-70%, which is strictly formulated according to the process formula to ensure that the proportion in the primer layer 2 meets the requirements and has good thermal stability and adhesion.

[0082] Topcoat layer 3 material: polyamide-imide is selected, the proportion of polyamide-imide is 30%-40%, the heat resistance index is greater than 220, the purity and chemical properties are stable, and the proportion in the topcoat layer 3 is accurately controlled in the predetermined range to achieve the best performance.

[0083] Self-lubricating layer 4 material: self-lubricating polyamide-imide, uniform particle size, can form a smooth and stable lubricating layer after coating, the thickness of the self-lubricating layer 4 can be accurately controlled between 0.002-0.004mm.

[0084] Coating equipment: equipped with high-precision enameled wire coating system, including paint supply device with accurate flow and pressure control, coating rack capable of achieving uniform coating, and oven with precise temperature control and ventilation function, to ensure the consistency of each paint layer coating thickness and curing effect.

[0085] II. Preparation process:

[0086] Primer layer 2 coating: install the pretreated metal core wire 1 on the coating equipment, start the paint supply system, and coat the polyester imide paint evenly on the surface of the metal core wire 1. By adjusting the coating speed, paint flow and coating path number and other parameters, the thickness of the primer layer 2 is accurately controlled within the corresponding proportion of the total thickness range. In one embodiment, after coating is completed, it can be immediately sent into the oven for curing, and the curing temperature and time are set according to the characteristics of polyester imide to ensure that the primer layer 2 is fully crosslinked to form a stable paint film structure.

[0087] In another embodiment, no polyester imide paint is coated, and all are cured.

[0088] Topcoat layer 3 coating: on the surface of the cured primer layer 2, polyamide-imide topcoat layer 3 is coated again using the coating equipment. During the coating process, the thickness and uniformity of the paint layer are closely monitored, and the coating parameters are adjusted according to the total thickness requirement to ensure that the topcoat layer 3 is tightly combined with the primer layer 2 and the thickness meets the design standard. After coating is completed, it is sent into the oven for curing, and the curing conditions are compatible with the curing of the primer layer 2 to enhance the overall performance of the enameled wire.

[0089] Self-lubricating layer 4 coating: using a special micro-coating process, self-lubricating polyamide-imide paint is coated on the surface of the topcoat layer 3, using high-precision coating mold and flow control system to ensure that the thickness of the self-lubricating layer 4 is between 0.002-0.004mm, and is firmly combined with the topcoat layer 3. After coating, oven curing is carried out to maintain its self-lubricating properties and stability.

[0090] III. Thickness detection and adjustment

[0091] After each layer of paint is coated and cured, a high-precision coating thickness gauge is used to detect the thickness of the paint layer. If the thickness is found to be outside the predetermined range, the parameters of the coating equipment, such as paint flow, coating speed, etc., are adjusted in time to correct the subsequent coating process, ensuring that the total thickness of the primer layer 2, topcoat layer 3 and self-lubricating layer 4 is always maintained between 0.03mm-0.08mm, ensuring the performance consistency and stability of the enameled wire.

[0092] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless otherwise specified. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. Techniques, methods and equipment known to those skilled in the relevant art can not be discussed in detail, but in appropriate cases, the techniques, methods and equipment should be considered as part of the authorized description. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings. In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of the parts themselves.

[0093] For purposes of the description hereinafter, spatial

[0094] In addition, it should be noted that the use of the terms "first", "second", etc., to describe a component having a defined property is only intended to distinguish between that component and another component having a different defined property, and is not otherwise intended to limit the scope of the present application unless otherwise indicated. The foregoing is merely illustrative of the principles of the present application and various modifications can be made by those skilled in the art. Other variations and modifications of the application are within the scope of the claims.

Claims

1. A self-lubricating enameled wire comprising a metal core wire (1), characterized in that: the metal core wire (1) is coated with a primer layer (2), the primer layer (2) is coated with a topcoat layer (3), and the topcoat layer (3) is coated with a self-lubricating layer (4), and the thickness of the self-lubricating layer (4) is 0.002mm-0.004mm.

2. The self-lubricating enameled wire according to claim 1, characterized in that: the primer layer (2) comprises polyester imine, the topcoat layer (3) comprises polyamide imide, and the self-lubricating layer (4) comprises self-lubricating polyamide imide.

3. The self-lubricating enameled wire according to claim 2, characterized in that: the proportion of polyester imine in the primer layer (2) is 60%-70%.

4. The self-lubricating enameled wire according to claim 3, characterized in that: the heat resistance index of the polyester imine in the primer layer (2) is greater than 200, and the primer layer (2) is formed by 10-14 coating and drying processes.

5. The self-lubricating enameled wire according to claim 2, characterized in that: the proportion of polyamide imide in the topcoat layer (3) is 30%-40%.

6. The self-lubricating enameled wire according to claim 5, characterized in that: the heat resistance index of the polyamide imide in the topcoat layer (3) is greater than 220, and the primer layer (2) is formed by 5-8 coating and drying processes.

7. The self-lubricating enameled wire according to any one of claims 1-6, characterized in that: the total thickness of the primer layer (2), the topcoat layer (3) and the self-lubricating layer (4) is 0.03mm-0.08mm.

8. The self-lubricating enameled wire according to claim 7, characterized in that: the ratio of the thickness of the primer layer (2) to the thickness of the topcoat layer (3) is 3:2-5:4.

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