Corona-resistant high PDIV enameled copper rectangular wire for 800V drive motor and method

Abstract

The invention relates to a corona-resistant, high-PDIV enameled copper flat wire and a method for producing it for an 800V drive motor. This relates to the technical field of winding wire for new energy vehicle motors. The enameled copper flat wire comprises a copper flat wire and a paint film, which comprises a primer layer, a mid-coat layer I, a mid-coat layer II, and a topcoat layer. The total thickness of the paint film is 0.28 to 0.30 mm. The preparation method comprises two coats of primer, 22 to 23 coats of mid-coat, and six coats of topcoat. The invention utilizes multiple steps to prepare a composite layer of paint that firmly coats the copper flat wire, resolving the problem of thick paint films prone to cracking and falling off during use. The invention exhibits excellent stability, high temperature resistance, and a uniform paint film. It also exhibits good corona resistance and a high PDIV. It is readily industrializable and can be used in high-load, high-power 800V motors for new energy vehicles, achieving corona resistance of over 300 hours and a PDIV of over 1500V. The market prospects are broad.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor winding wires for new energy vehicles, and in particular relates to a high-corona-resistant and high-PDIV enameled rectangular copper wire applied to an 800V high-efficiency drive motor for new energy vehicles and a painting method thereof. Background Art

[0002] New energy vehicles are battery-powered vehicles whose drive motors convert electrical energy into mechanical power to propel the vehicle. When electric vehicles start and accelerate suddenly, strong corona is generated on the copper wire, necessitating specialized winding wires capable of withstanding high currents and pulse voltages.

[0003] Existing corona-resistant technologies often employ composite mica tape wrapping to enhance corona resistance and withstand voltage, or by increasing inter-turn insulation during the winding process. This approach increases the thickness of the insulation layer, making it prone to cracking after bending, significantly reducing insulation at bends. It also leads to increased winding volume, poor heat dissipation, and complex processing, resulting in cost and reliability issues. To address this, the industry has also adopted enameled wire, which consists of two components: a conductor and an insulation layer. Enameled wire is made by coating bare wire with paint.

[0004] CN202976926U discloses a double-layered corona-resistant enameled copper flat wire. The composite coating consists of a primer (DuPont Voltatex 7735), which accounts for 70% to 90% of the wire's thickness, and a topcoat (DuPont Voltatex 8827), which accounts for 10% to 30% of the wire's thickness. While this coating is low-cost, its corona resistance is poor, making it unsuitable for use in 800V motors.

[0005] CN102034568A discloses a corona-resistant enameled copper flat wire and its processing technology. The flat wire conductor is coated with three layers of insulating paint film. The first layer is a polyester paint film, the second layer is a corona-resistant paint film (HPH-35A type corona-resistant paint), and the third layer is a polyesterimide or polyimide paint film. The total thickness of the paint film is 0.12-0.17mm, and the thickness of the corona-resistant paint film is 0.03-0.05mm. The process is to apply one layer at a time, and then produce a cross-linking and curing reaction in the temperature range of 380±30℃. After natural cooling, the above painting process is repeated 11 times; the thickness of the paint layer applied each time is controlled between 0.01mm-0.015mm. This painting process can only support thinner paint films (total thickness of 0.12-0.17mm). Thin paint films cannot achieve good corona resistance. If the paint film is thickened, there is a hidden danger of cracking and falling off.

[0006] CN210200349U discloses a 200-grade corona-resistant enameled copper flat wire. The outer surface of the copper flat wire is sequentially provided with a first paint layer (polyamide-imide paint layer), a metal shielding layer, a second paint layer (nylon fiber paint layer), and a wear-resistant layer (polybenzimidazole resin layer), for a total of four layers. The thickness of the first paint layer is 0.06-0.08mm, the thickness of the metal shielding layer is 0.03-0.05mm, the thickness of the second paint layer is 0.1-0.12mm, and the thickness of the wear-resistant layer is 0.02-0.04mm, resulting in a total thickness of 0.21-0.29mm. Because of the four-layer paint film, the layered structure is complex and the total thickness is relatively thick, a strong bond is required. Specifically, the first paint layer is provided with a plurality of first skew grooves, and the metal shielding layer is provided with a plurality of second skew grooves to increase the bonding strength and prevent the layers from separating and falling off. However, in this way, the opening of the inclined groove will affect the thickness of the layer. The thickness of the inclined groove part is relatively thin, and it is impossible to achieve a uniform corona resistance effect. The service life is short, and there is a safety hazard of the inclined groove being punctured.

[0007] CN213691498U discloses a 240-grade corona-resistant enameled copper flat wire for new energy vehicle drive motors. The main innovation lies in the copper flat wire used being secondary annealed, forming an oxygen-inert passivation layer after annealing. The paint film includes a first insulating layer (polyimide varnish), a shielding layer (tin), a second insulating layer (polyimide varnish), and a repair layer (polyvinyl butyral, densely covered with glass microbeads less than 5μm). Copper wire (0.03-0.05mm diameter, 0.2-0.3mm pitch) is spirally wound between the first insulating layer and the shielding layer. Although this design is suitable for 240-grade corona resistance, it is complex to prepare, with high material and process costs, poor economic practicality, and no market value. Summary of the Invention

[0008] To address the shortcomings of existing enameled rectangular copper wire, such as thin thickness, short corona resistance life, low PDIV, easy shedding after thickening, short service life, high cost, and poor economic and practicality, the present invention provides a corona-resistant, high-PDIV enameled rectangular copper wire for 800V drive motors and a method for producing it. This method utilizes multiple steps to prepare a composite layer of lacquer that firmly coats the copper rectangular wire, making it less susceptible to shedding even with thick paint films. Fifteen to seventeen corona-resistant layers and five to eight PDIV reinforcement layers achieve the corona resistance and PDIV performance required for 800V motors, while also being cost-effective, economical, and highly marketable. The specific technical solution is as follows:

[0009] An 800V drive motor with high PDIV corona resistance enameled copper flat wire comprises a copper flat wire 1 and a paint film 2. The paint film 2 comprises a primer layer 2.1, a mid-coat layer I 2.2, a mid-coat layer II 2.3, and a topcoat layer 2.4. The total thickness of the paint film 2 is 0.28 to 0.30 mm.

[0010] In the above technical solution, the thickness of the primer layer 2.1 is 0.02-0.03 mm; the thickness of the intermediate paint layer I 2.2 is 0.15-0.17 mm; the thickness of the intermediate paint layer II 2.3 is 0.05-0.08 mm; the thickness of the topcoat layer 2.4 is 0.06-0.08 mm;

[0011] In the above technical solution, the primer layer 2.1 is a polyimide paint, model HI-409-2803;

[0012] In the above technical solution, the middle paint layer I2.2 is a corona-resistant paint, and the raw material components of the corona-resistant paint are composed of the following mass parts: 35-40 parts of xylene, 20-30 parts of polyethylene wax, 15-18 parts of tris(2-hydroxyethyl)isocyanurate, 10-20 parts of nano-glass powder, 25-30 parts of phenol, 15-16 parts of 4,4'-diphenylmethane diisocyanate, 15-18 parts of N-methyl-2-pyrrolidone, 22-24 parts of ethylene glycol, 12-14 parts of dimethyl terephthalate, 5-7 parts of trimellitic anhydride, 4-5 parts of tetrabutyl titanate, 1-2 parts of terephthalic acid and 0.2-0.3 parts of polydimethylsiloxane;

[0013] In the above technical solution, the middle paint layer II 2.3 is a PDIV-enhanced paint, and the raw material components of the PDIV-enhanced paint are as follows: 30-40 parts of 66 nylon, 50-60 parts of terephthalic acid, 30-40 parts of cresol, 20-25 parts of polydiacid, 15-18 parts of polyethylene, 15-20 parts of ethylene glycol, 8-10 parts of xylene, 12-13 parts of tung oil anhydride, 5-7 parts of phenolic resin, 10-13 parts of zinc acetate, 10-12 parts of glycerin, 2-3 parts of epoxy resin, and 8-10 parts of cresol;

[0014] In the above technical solution, the topcoat layer 2.4 is a polyimide paint, model HI-406GA-30S;

[0015] In the above technical solution, the enameled copper rectangular wire is suitable for 800V drive motors of new energy vehicles;

[0016] In the above technical solution, the enameled copper rectangular wire has a corona resistance of more than 300 hours and a PDIV of more than 1500V.

[0017] The painting method of the corona-resistant high PDIV enameled rectangular copper wire for the 800V drive motor comprises the following steps:

[0018] Step 1, apply 2 coats of primer:

[0019] Applying the first coat of primer: The copper flat wire is conveyed at a speed of 8-8.2m / min, firstly, the primer is applied through the paint tank, and then the excess primer on the surface of the copper flat wire is scraped through the mold. The thickness of the paint film is controlled at 0.01-0.015mm; then it continues to be conveyed and enters the drying oven from the lower mouth for cross-linking and curing. The temperature in the curing zone is 430-450℃. After the cured copper flat wire comes out from the upper mouth of the drying oven, it is naturally cooled, and the first coat of primer is completed.

[0020] Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer;

[0021] The paint tank is filled with HI-409-2803 polyimide paint;

[0022] Step 2: Apply 22 to 23 coats of mid-coat:

[0023] (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 430 to 450°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I.

[0024] The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I.

[0025] The paint tank is filled with corona-resistant paint;

[0026] (2) Apply 5 to 8 coats of intermediate paint II: The copper flat wire coated with intermediate paint I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with intermediate paint II through a paint tank. The excess intermediate paint II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the intermediate paint II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 430 to 450°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of intermediate paint II.

[0027] The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II.

[0028] The paint tank is filled with PDIV enhanced paint;

[0029] Step 3, apply 6 coats of topcoat:

[0030] The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven from the bottom port for cross-linking and curing, with the curing zone temperature at 430-450°C. The cured copper flat wire exits the top port of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat.

[0031] The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire.

[0032] The paint tank is filled with HI-406GA-30S polyimide paint;

[0033] In the above technical solution, the length of the baking oven is 8 meters.

[0034] Compared with the prior art, the corona-resistant high PDIV enameled copper rectangular wire and method for 800V drive motor of the present invention have the following beneficial effects:

[0035] 1. The function of the primer layer of the present invention is to enhance the adhesion of the paint layer. Applying it twice can achieve better adhesion and bonding. The first coating is to better adhere to the copper flat wire and repair the surface defects of the copper flat wire; and the second coating is to better combine the first primer with the mid-coat to prevent delamination and cracking. The thickness design of the two primers can not only repair surface defects twice, but also ensure bonding compatibility.

[0036] 2. The function of the middle paint layer of the present invention is to achieve the corona resistance effect and higher PDIV of the 800V motor. In order to achieve the higher corona resistance effect, the thickness is designed to be thicker. However, if a larger thickness is applied once or a small number of times and cured at 430-450°C, it is easy to crack and fall off. Therefore, the present invention designs 22-23 coats of coating, which can achieve a good cross-linking effect, especially the first three coats of coating can be cross-linked with the primer. The multiple step-by-step cross-linking has better adhesion, and the cross-linking and curing effect is good at a temperature of 430-450°C. Each coat is thinner, which can ensure effective cross-linking and prevent the curing speed from being too fast, so that the bonding between the 22-23 coating layers is better, and it will not be delaminated during use.

[0037] 3. The composition design of the middle paint layer I and the middle paint layer II of the present invention can be well combined with the primer and the topcoat, and has good insulation performance and corona resistance, is suitable for 800V high-efficiency drive motors, and can achieve corona resistance of more than 300h and PDIV of more than 1500V.

[0038] Fourth, the middle paint layer II of the present invention can well protect the middle paint layer I and serve as a second layer of corona-resistant protection; at the same time, the middle paint layer II further plays a role in repairing surface defects and improving PDIV.

[0039] 5. The topcoat layer of the present invention is resistant to high temperature and oil (ATF oil), and has high electrical properties. It is also coated with 6 coats of topcoat, of which the first two coats are for better bonding with the middle paint layer. Each coat is cross-linked and cured at a temperature of 430-450°C, which can not only ensure good cross-linking, but also prevent the curing speed from being too fast and causing cracking during use, thereby ensuring the bonding strength between the topcoat layer and the middle paint layer.

[0040] In summary, the present invention solves the problem of easy cracking and falling off of thick paint layers (total thickness of the paint layer is 0.28-0.30 mm) during use through 30-31 coating technology. It has good stability, high temperature resistance, uniform paint film, good corona resistance and high PDIV, is suitable for industrialization, and can be used for high-load, high-power 800V high-efficiency drive motors for new energy vehicles, and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic structural diagram of the corona-resistant high PDIV enameled rectangular copper wire for an 800V drive motor according to the present invention;

[0042] Figure 2 for Figure 1 Schematic diagram of the detailed structure of the middle paint film;

[0043] Figure 1-2 Middle: 1-copper flat wire, 2-paint film, 2.1-primer layer, 2.2-middle paint layer I, 2.3-middle paint layer II, 2.4-topcoat layer; DETAILED DESCRIPTION

[0044] The following is a combination of specific implementation cases and attached Figure 1-2 The present invention is further described below, but the present invention is not limited to these embodiments.

[0045] Example 1

[0046] 800V drive motor with high PDIV enameled copper wire, such as Figure 1 and 2 As shown, the enameled rectangular copper wire comprises a rectangular copper wire 1 and a paint film 2, wherein the paint film 2 comprises a primer layer 2.1, a mid-coat layer I 2.2, a mid-coat layer II 2.3, and a topcoat layer 2.4; the total thickness of the paint film 2 is 0.29 mm;

[0047] The thickness of the primer layer 2.1 is 0.02mm; the thickness of the intermediate paint layer I 2.2 is 0.15mm, the thickness of the intermediate paint layer II 2.3 is 0.05mm; the thickness of the topcoat layer 2.4 is 0.07mm;

[0048] The primer layer 2.1 is a polyimide paint, model HI-409-2803;

[0049] The middle paint layer I2.2 is a corona-resistant paint. The raw material components of the corona-resistant paint are as follows: 35 parts by mass of xylene, 20 parts by mass of polyethylene wax, 15 parts by mass of tris(2-hydroxyethyl)isocyanurate, 10 parts by mass of nano-glass powder, 25 parts by mass of phenol, 15 parts by mass of 4,4'-diphenylmethane diisocyanate, 15 parts by mass of N-methyl-2-pyrrolidone, 22 parts by mass of ethylene glycol, 12 parts by mass of dimethyl terephthalate, 5 parts by mass of trimellitic anhydride, 4 parts by mass of tetrabutyl titanate, 1 part by mass of terephthalic acid, and 0.2 parts by mass of polydimethylsiloxane.

[0050] The middle paint layer II 2.3 is a corona-resistant protective paint. The raw material components of the corona-resistant protective paint are as follows: 30 parts of 66 nylon, 50 parts of terephthalic acid, 30 parts of cresol, 20 parts of polydiacid, 15 parts of polyethylene, 15 parts of ethylene glycol, 8 parts of xylene, 12 parts of tung oil anhydride, 5 parts of phenolic resin, 10 parts of zinc acetate, 10 parts of glycerin, 2 parts of epoxy resin, and 8 parts of cresol.

[0051] The topcoat layer 2.4 is a polyimide paint, model HI-406GA-30S;

[0052] The enameling method of the corona-resistant high PDIV enameled rectangular copper wire for the 800V drive motor comprises the following steps:

[0053] Step 1, apply 2 coats of primer:

[0054] Apply the first coat of primer: convey the copper flat wire at a speed of 8-8.2m / min, first apply primer through the paint tank, then scrape off excess primer on the surface of the copper flat wire through the mold, and control the paint film thickness at 0.01-0.015mm; then continue conveying and enter the drying oven from the lower port for cross-linking and curing. The temperature in the curing zone is 430℃. After the cured copper flat wire comes out from the upper port of the drying oven, it is naturally cooled, and the first coat of primer is completed.

[0055] Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer;

[0056] The paint tank is filled with HI-409-2803 polyimide paint;

[0057] Step 2: Apply 22 to 23 coats of mid-coat:

[0058] (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 430°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I.

[0059] The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I.

[0060] The paint tank is filled with corona-resistant paint;

[0061] (2) Apply 5 to 8 coats of mid-coat II: The copper flat wire coated with mid-coat I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat II through a paint tank. The excess mid-coat II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 430°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat II.

[0062] The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II.

[0063] The paint tank is filled with PDIV-enhanced paint;

[0064] Step 3, apply 6 coats of topcoat:

[0065] The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven from the bottom port for cross-linking and curing, with the curing zone temperature at 430°C. The cured copper flat wire exits the top port of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat.

[0066] The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire.

[0067] The paint tank is filled with HI-406GA-30S polyimide paint;

[0068] In this embodiment, the length of the oven is 8 meters.

[0069] The enameled copper flat wire prepared in this embodiment has been tested and has a good anti-corona effect on 800V motors, achieving a corona resistance of 320h and a PDIV of 1520V. There is no breakdown after 30 tests, no cracking or falling off during winding, and no cracking or falling off on the curved surface.

[0070] Example 2

[0071] 800V drive motor with high PDIV enameled copper wire, such as Figure 1 and 2 As shown, the enameled rectangular copper wire comprises a rectangular copper wire 1 and a paint film 2, wherein the paint film 2 comprises a primer layer 2.1, a mid-coat layer I 2.2, a mid-coat layer II 2.3, and a topcoat layer 2.4; the total thickness of the paint film 2 is 0.28 mm;

[0072] The thickness of the primer layer 2.1 is 0.02 mm; the thickness of the intermediate paint layer I 2.2 is 0.15 mm; the thickness of the intermediate paint layer II 2.3 is 0.05 mm; the thickness of the topcoat layer 2.4 is 0.06 mm;

[0073] The primer layer 2.1 is a polyimide paint, model HI-409-2803;

[0074] The middle paint layer I2.2 is a corona-resistant paint. The raw material components of the corona-resistant paint are as follows: 40 parts by mass of xylene, 30 parts of polyethylene wax, 18 parts of tris(2-hydroxyethyl)isocyanurate, 20 parts of nano-glass powder, 30 parts of phenol, 16 parts of 4,4'-diphenylmethane diisocyanate, 18 parts of N-methyl-2-pyrrolidone, 24 parts of ethylene glycol, 14 parts of dimethyl terephthalate, 7 parts of trimellitic anhydride, 5 parts of tetrabutyl titanate, 2 parts of terephthalic acid and 0.3 parts of polydimethylsiloxane;

[0075] The middle paint layer II 2.3 is a corona-resistant protective paint. The raw material components of the corona-resistant protective paint are as follows: 40 parts by mass of 66 nylon, 60 parts by mass of terephthalic acid, 40 parts by mass of cresol, 25 parts by mass of polydiacid, 18 parts by mass of polyethylene, 20 parts by mass of ethylene glycol, 10 parts by mass of xylene, 13 parts by mass of tung oil anhydride, 7 parts by mass of phenolic resin, 13 parts by mass of zinc acetate, 12 parts by mass of glycerin, 3 parts by mass of epoxy resin, and 10 parts by mass of cresol.

[0076] The topcoat layer 2.4 is a polyimide paint, model HI-406GA-30S;

[0077] The enameling method of the corona-resistant high PDIV enameled rectangular copper wire for the 800V drive motor comprises the following steps:

[0078] Step 1, apply 2 coats of primer:

[0079] Applying the first coat of primer: The copper flat wire is conveyed at a speed of 8 to 8.2 m / min, firstly, the primer is applied through the paint tank, and then the excess primer on the surface of the copper flat wire is scraped off through the mold. The thickness of the paint film is controlled at 0.01 to 0.015 mm; then it continues to be conveyed and enters the drying oven from the lower port for cross-linking and curing. The temperature in the curing zone is 450°C. After the cured copper flat wire comes out from the upper port of the drying oven, it is naturally cooled, and the first coat of primer is completed.

[0080] Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer;

[0081] The paint tank is filled with HI-409-2803 polyimide paint;

[0082] Step 2: Apply 22 to 23 coats of mid-coat:

[0083] (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 450°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I.

[0084] The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I.

[0085] The paint tank is filled with corona-resistant paint;

[0086] (2) Apply 5 to 8 coats of mid-coat II: The copper flat wire coated with mid-coat I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat II through a paint tank. The excess mid-coat II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 450°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat II.

[0087] The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II.

[0088] The paint tank is filled with PDIV-enhanced paint;

[0089] Step 3, apply 6 coats of topcoat:

[0090] The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven from the bottom port for cross-linking and curing, with the curing zone temperature at 450°C. The cured copper flat wire exits the top port of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat.

[0091] The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire.

[0092] The paint tank is filled with HI-406GA-30S polyimide paint;

[0093] In this embodiment, the length of the oven is 8 meters.

[0094] The enameled copper flat wire prepared in this embodiment has been tested and has a good anti-corona effect on the 800V motor of new energy vehicles, achieving a corona resistance of 310h and a PDIV of 1520V. There is no breakdown phenomenon in 40 tests, no cracking or falling off during winding, and no cracking or falling off on the curved surface.

[0095] Example 3

[0096] 800V drive motor with high PDIV enameled copper wire, such as Figure 1 and 2 As shown, the enameled rectangular copper wire comprises a rectangular copper wire 1 and a paint film 2, wherein the paint film 2 comprises a primer layer 2.1, a mid-coat layer I 2.2, a mid-coat layer II 2.3, and a topcoat layer 2.4; the total thickness of the paint film 2 is 0.30 mm;

[0097] The thickness of the primer layer 2.1 is 0.03mm; the thickness of the intermediate paint layer I 2.2 is 0.16mm, the thickness of the intermediate paint layer II 2.3 is 0.05mm; the thickness of the topcoat layer 2.4 is 0.06mm;

[0098] The primer layer 2.1 is a polyimide paint, model HI-409-2803;

[0099] The middle paint layer I2.2 is a corona-resistant paint. The raw material components of the corona-resistant paint are as follows: 38 parts by mass of xylene, 25 parts of polyethylene wax, 17 parts of tris(2-hydroxyethyl)isocyanurate, 15 parts of nano-glass powder, 28 parts of phenol, 16 parts of 4,4'-diphenylmethane diisocyanate, 17 parts of N-methyl-2-pyrrolidone, 23 parts of ethylene glycol, 13 parts of dimethyl terephthalate, 6 parts of trimellitic anhydride, 5 parts of tetrabutyl titanate, 2 parts of terephthalic acid and 0.3 parts of polydimethylsiloxane;

[0100] The middle paint layer II 2.3 is a corona-resistant protective paint. The raw material components of the corona-resistant protective paint are as follows: 35 parts of 66 nylon, 55 parts of terephthalic acid, 35 parts of cresol, 22 parts of polydiacid, 17 parts of polyethylene, 18 parts of ethylene glycol, 9 parts of xylene, 13 parts of tung oil anhydride, 6 parts of phenolic resin, 12 parts of zinc acetate, 11 parts of glycerin, 3 parts of epoxy resin, and 9 parts of cresol.

[0101] The topcoat layer 2.4 is a polyimide paint, model HI-406GA-30S;

[0102] The enameling method of the corona-resistant high PDIV enameled rectangular copper wire for the 800V drive motor comprises the following steps:

[0103] Step 1, apply 2 coats of primer:

[0104] Applying the first coat of primer: The copper flat wire is conveyed at a speed of 8 to 8.2 m / min, firstly, the primer is applied through the paint tank, and then the excess primer on the surface of the copper flat wire is scraped off through the mold. The thickness of the paint film is controlled at 0.01 to 0.015 mm; then it continues to be conveyed and enters the drying oven from the lower port for cross-linking and curing. The temperature in the curing zone is 440°C. After the cured copper flat wire comes out of the upper port of the drying oven, it is naturally cooled, and the first coat of primer is completed.

[0105] Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer;

[0106] The paint tank is filled with HI-409-2803 polyimide paint;

[0107] Step 2: Apply 22 to 23 coats of mid-coat:

[0108] (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 440°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I.

[0109] The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I.

[0110] The paint tank is filled with corona-resistant paint;

[0111] (2) Apply 5 to 8 coats of mid-coat II: The copper flat wire coated with mid-coat I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat II through a paint tank. The excess mid-coat II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 440°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat II.

[0112] The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II.

[0113] The paint tank is filled with PDIV-enhanced paint;

[0114] Step 3, apply 6 coats of topcoat:

[0115] The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven from the bottom port for cross-linking and curing, with the curing zone temperature at 440°C. The cured copper flat wire exits the top port of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat.

[0116] The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire.

[0117] The paint tank is filled with HI-406GA-30S polyimide paint;

[0118] In this embodiment, the length of the oven is 8 meters.

[0119] The enameled copper flat wire prepared in this embodiment has been tested and has a good anti-corona effect on the 800V motor of new energy vehicles, achieving a corona resistance of 315h and PDIV1515V. There is no breakdown phenomenon in 35 experiments, no cracking or falling off during winding, and no cracking or falling off on the curved surface.

[0120] Example 4

[0121] 800V drive motor with high PDIV enameled copper wire, such as Figure 1 and 2 As shown, the enameled rectangular copper wire comprises a rectangular copper wire 1 and a paint film 2, wherein the paint film 2 comprises a primer layer 2.1, a mid-coat layer I 2.2, a mid-coat layer II 2.3, and a topcoat layer 2.4; the total thickness of the paint film 2 is 0.30 mm;

[0122] The thickness of the primer layer 2.1 is 0.02mm; the thickness of the intermediate paint layer I 2.2 is 0.15mm, the thickness of the intermediate paint layer II 2.3 is 0.05mm; the thickness of the topcoat layer 2.4 is 0.08mm;

[0123] The primer layer 2.1 is a polyimide paint, model HI-409-2803;

[0124] The middle paint layer I2.2 is a corona-resistant paint. The raw material components of the corona-resistant paint are as follows: 36 parts by mass of xylene, 28 parts of polyethylene wax, 16 parts of tris(2-hydroxyethyl)isocyanurate, 11 parts of nano-glass powder, 26 parts of phenol, 15 parts of 4,4'-diphenylmethane diisocyanate, 16 parts of N-methyl-2-pyrrolidone, 24 parts of ethylene glycol, 14 parts of dimethyl terephthalate, 7 parts of trimellitic anhydride, 4 parts of tetrabutyl titanate, 2 parts of terephthalic acid and 0.2 parts of polydimethylsiloxane;

[0125] The middle paint layer II 2.3 is a corona-resistant protective paint. The raw material components of the corona-resistant protective paint are as follows: 36 parts of 66 nylon, 54 parts of terephthalic acid, 37 parts of cresol, 21 parts of polydiacid, 17 parts of polyethylene, 16 parts of ethylene glycol, 10 parts of xylene, 12 parts of tung oil anhydride, 5 parts of phenolic resin, 10 parts of zinc acetate, 12 parts of glycerin, 3 parts of epoxy resin, and 8 parts of cresol.

[0126] The topcoat layer 2.4 is a polyimide paint, model HI-406GA-30S;

[0127] The enameling method of the corona-resistant high PDIV enameled rectangular copper wire for the 800V drive motor comprises the following steps:

[0128] Step 1, apply 2 coats of primer:

[0129] Applying the first coat of primer: The copper flat wire is conveyed at a speed of 8-8.2m / min, firstly, the primer is applied through the paint tank, and then the excess primer on the surface of the copper flat wire is scraped through the mold. The thickness of the paint film is controlled at 0.01-0.015mm; then it continues to be conveyed and enters the drying oven from the lower mouth for cross-linking and curing. The temperature in the curing zone is 430-450℃. After the cured copper flat wire comes out from the upper mouth of the drying oven, it is naturally cooled, and the first coat of primer is completed.

[0130] Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer;

[0131] The paint tank is filled with HI-409-2803 polyimide paint;

[0132] Step 2: Apply 22 to 23 coats of mid-coat:

[0133] (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 430 to 450°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I.

[0134] The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I.

[0135] The paint tank is filled with corona-resistant paint;

[0136] (2) Apply 5 to 8 coats of intermediate paint II: The copper flat wire coated with intermediate paint I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with intermediate paint II through a paint tank. The excess intermediate paint II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the intermediate paint II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 430 to 450°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of intermediate paint II.

[0137] The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II.

[0138] The paint tank is filled with PDIV-enhanced paint;

[0139] Step 3, apply 6 coats of topcoat:

[0140] The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven from the bottom port for cross-linking and curing, with the curing zone temperature at 430-450°C. The cured copper flat wire exits the top port of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat.

[0141] The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire.

[0142] The paint tank is filled with HI-406GA-30S polyimide paint;

[0143] In this embodiment, the length of the oven is 8 meters.

[0144] The enameled copper flat wire prepared in this embodiment has been tested and has a good anti-corona effect on 800V motors, achieving a corona resistance of 325h and a PDIV of 1525V. There is no breakdown after 25 tests, no cracking or falling off during winding, and no cracking or falling off on the curved surface.

[0145] Example 5

[0146] 800V drive motor with high PDIV enameled copper wire, such as Figure 1 and 2 As shown, the enameled rectangular copper wire comprises a rectangular copper wire 1 and a paint film 2, wherein the paint film 2 comprises a primer layer 2.1, a mid-coat layer I 2.2, a mid-coat layer II 2.3, and a topcoat layer 2.4; the total thickness of the paint film 2 is 0.30 mm;

[0147] The thickness of the primer layer 2.1 is 0.02mm; the thickness of the intermediate paint layer I 2.2 is 0.16mm, the thickness of the intermediate paint layer II 2.3 is 0.05mm; the thickness of the topcoat layer 2.4 is 0.07mm;

[0148] The primer layer 2.1 is a polyimide paint, model HI-409-2803;

[0149] The middle paint layer I2.2 is a corona-resistant paint. The raw material components of the corona-resistant paint are as follows: 38 parts by mass of xylene, 22 parts of polyethylene wax, 15 parts of tris(2-hydroxyethyl)isocyanurate, 14 parts of nano-glass powder, 26 parts of phenol, 16 parts of 4,4'-diphenylmethane diisocyanate, 18 parts of N-methyl-2-pyrrolidone, 24 parts of ethylene glycol, 12 parts of dimethyl terephthalate, 6 parts of trimellitic anhydride, 5 parts of tetrabutyl titanate, 2 parts of terephthalic acid and 0.2 parts of polydimethylsiloxane;

[0150] The middle paint layer II 2.3 is a corona-resistant protective paint. The raw material components of the corona-resistant protective paint are as follows: 36 parts of 66 nylon, 58 parts of terephthalic acid, 34 parts of cresol, 24 parts of polydiacid, 18 parts of polyethylene, 18 parts of ethylene glycol, 10 parts of xylene, 12 parts of tung oil anhydride, 7 parts of phenolic resin, 12 parts of zinc acetate, 10 parts of glycerin, 3 parts of epoxy resin, and 10 parts of cresol.

[0151] The topcoat layer 2.4 is a polyimide paint, model HI-406GA-30S;

[0152] The enameling method of the corona-resistant high PDIV enameled rectangular copper wire for the 800V drive motor comprises the following steps:

[0153] Step 1, apply 2 coats of primer:

[0154] Apply the first coat of primer: convey the copper flat wire at a speed of 8-8.2m / min, first apply primer through the paint tank, then scrape off excess primer on the surface of the copper flat wire through the mold, and control the paint film thickness at 0.01-0.015mm; then continue conveying and enter the drying oven from the lower port for cross-linking and curing. The temperature in the curing zone is 435℃. After the cured copper flat wire comes out from the upper port of the drying oven, it is naturally cooled, and the first coat of primer is completed.

[0155] Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer;

[0156] The paint tank is filled with HI-409-2803 polyimide paint;

[0157] Step 2: Apply 22 to 23 coats of mid-coat:

[0158] (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 435°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I.

[0159] The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I.

[0160] The paint tank is filled with corona-resistant paint;

[0161] (2) Apply 5 to 8 coats of mid-coat II: The copper flat wire coated with mid-coat I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat II through a paint tank. The excess mid-coat II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 435°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat II.

[0162] The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II.

[0163] The paint tank is filled with PDIV-enhanced paint;

[0164] Step 3, apply 6 coats of topcoat:

[0165] The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven through the lower opening for cross-linking and curing, with the curing zone temperature at 435°C. The cured copper flat wire exits the upper opening of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat.

[0166] The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire.

[0167] The paint tank is filled with HI-406GA-30S polyimide paint;

[0168] In this embodiment, the length of the oven is 8 meters.

[0169] The enameled copper flat wire prepared in this embodiment has been tested and has a good anti-corona effect on 800V motors, achieving a corona resistance of 318h and a PDIV of 1522V. There is no breakdown phenomenon in 32 tests, no cracking or falling off during winding, and no cracking or falling off on the curved surface.

[0170] Example 6

[0171] 800V drive motor with high PDIV enameled copper wire, such as Figure 1 and 2 As shown, the enameled rectangular copper wire comprises a rectangular copper wire 1 and a paint film 2, wherein the paint film 2 comprises a primer layer 2.1, a mid-coat layer I 2.2, a mid-coat layer II 2.3, and a topcoat layer 2.4; the total thickness of the paint film 2 is 0.30 mm;

[0172] The thickness of the primer layer 2.1 is 0.03 mm; the thickness of the intermediate paint layer I 2.2 is 0.15 mm, the thickness of the intermediate paint layer II 2.3 is 0.06 mm; the thickness of the topcoat layer 2.4 is 0.06 mm;

[0173] The primer layer 2.1 is a polyimide paint, model HI-409-2803;

[0174] The middle paint layer I2.2 is a corona-resistant paint. The raw material components of the corona-resistant paint are as follows: 35 parts by mass of xylene, 25 parts of polyethylene wax, 17 parts of tris(2-hydroxyethyl)isocyanurate, 12 parts of nano-glass powder, 28 parts of phenol, 16 parts of 4,4'-diphenylmethane diisocyanate, 16 parts of N-methyl-2-pyrrolidone, 23 parts of ethylene glycol, 14 parts of dimethyl terephthalate, 5 parts of trimellitic anhydride, 5 parts of tetrabutyl titanate, 1 part of terephthalic acid and 0.2 parts of polydimethylsiloxane;

[0175] The middle paint layer II 2.3 is a corona-resistant protective paint. The raw material components of the corona-resistant protective paint are as follows: 36 parts of 66 nylon, 58 parts of terephthalic acid, 32 parts of cresol, 22 parts of polydiacid, 17 parts of polyethylene, 20 parts of ethylene glycol, 8 parts of xylene, 12 parts of tung oil anhydride, 7 parts of phenolic resin, 13 parts of zinc acetate, 10 parts of glycerin, 2 parts of epoxy resin, and 10 parts of cresol.

[0176] The topcoat layer 2.4 is a polyimide paint, model HI-406GA-30S;

[0177] The enameling method of the corona-resistant high PDIV enameled rectangular copper wire for the 800V drive motor comprises the following steps:

[0178] Step 1, apply 2 coats of primer:

[0179] Apply the first coat of primer: transport the copper flat wire at a speed of 8-8.2m / min, first apply primer through the paint tank, then scrape off excess primer on the surface of the copper flat wire through the mold, and control the paint film thickness at 0.01-0.015mm; then continue to transport and enter the drying oven from the lower mouth for cross-linking and curing. The temperature in the curing zone is 445℃. After the cured copper flat wire comes out of the upper mouth of the drying oven, it is naturally cooled, and the first coat of primer is completed.

[0180] Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer;

[0181] The paint tank is filled with HI-409-2803 polyimide paint;

[0182] Step 2: Apply 22 to 23 coats of mid-coat:

[0183] (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 445°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I.

[0184] The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I.

[0185] The paint tank is filled with corona-resistant paint;

[0186] (2) Apply 5 to 8 coats of mid-coat II: The copper flat wire coated with mid-coat I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat II through a paint tank. The excess mid-coat II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 445°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat II.

[0187] The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II.

[0188] The paint tank is filled with PDIV-enhanced paint;

[0189] Step 3, apply 6 coats of topcoat:

[0190] The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven through the lower opening for cross-linking and curing, with the curing zone temperature at 445°C. The cured copper flat wire exits the upper opening of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat.

[0191] The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire.

[0192] The paint tank is filled with HI-406GA-30S polyimide paint;

[0193] In this embodiment, the length of the oven is 8 meters.

[0194] The enameled copper flat wire prepared in this embodiment has been tested to have a good anti-corona effect in an 800V motor, achieving a corona resistance of 316h and a PDIV of 1518V. There is no breakdown after 40 tests, no cracking or falling off during winding, and no cracking or falling off at the curved surface.

[0195] Example 7

[0196] 800V drive motor with high PDIV enameled copper wire, such as Figure 1 and 2 As shown, the enameled rectangular copper wire comprises a rectangular copper wire 1 and a paint film 2, wherein the paint film 2 comprises a primer layer 2.1, a mid-coat layer I 2.2, a mid-coat layer II 2.3, and a topcoat layer 2.4; the total thickness of the paint film 2 is 0.29 mm;

[0197] The thickness of the primer layer 2.1 is 0.02 mm; the thickness of the intermediate paint layer I 2.2 is 0.16 mm; the thickness of the intermediate paint layer II 2.3 is 0.05 mm; the thickness of the topcoat layer 2.4 is 0.06 mm;

[0198] The primer layer 2.1 is a polyimide paint, model HI-409-2803;

[0199] The middle paint layer I2.2 is a corona-resistant paint. The raw material components of the corona-resistant paint are as follows: 39 parts by mass of xylene, 29 parts of polyethylene wax, 18 parts of tris(2-hydroxyethyl)isocyanurate, 12 parts of nano-glass powder, 27 parts of phenol, 15 parts of 4,4'-diphenylmethane diisocyanate, 16 parts of N-methyl-2-pyrrolidone, 23 parts of ethylene glycol, 12 parts of dimethyl terephthalate, 6 parts of trimellitic anhydride, 5 parts of tetrabutyl titanate, 2 parts of terephthalic acid and 0.2 parts of polydimethylsiloxane;

[0200] The middle paint layer II 2.3 is a corona-resistant protective paint. The raw material components of the corona-resistant protective paint are as follows: 31 parts of 66 nylon, 57 parts of terephthalic acid, 32 parts of cresol, 24 parts of polydiacid, 17 parts of polyethylene, 16 parts of ethylene glycol, 9 parts of xylene, 12 parts of tung oil anhydride, 5 parts of phenolic resin, 12 parts of zinc acetate, 11 parts of glycerin, 3 parts of epoxy resin, and 8 parts of cresol.

[0201] The topcoat layer 2.4 is a polyimide paint, model HI-406GA-30S;

[0202] The enameling method of the corona-resistant high PDIV enameled rectangular copper wire for the 800V drive motor comprises the following steps:

[0203] Step 1, apply 2 coats of primer:

[0204] Applying the first coat of primer: The copper flat wire is conveyed at a speed of 8 to 8.2 m / min, firstly, the primer is applied through the paint tank, and then the excess primer on the surface of the copper flat wire is scraped off through the mold. The thickness of the paint film is controlled at 0.01 to 0.015 mm; then it continues to be conveyed and enters the drying oven from the lower port for cross-linking and curing. The temperature in the curing zone is 450°C. After the cured copper flat wire comes out from the upper port of the drying oven, it is naturally cooled, and the first coat of primer is completed.

[0205] Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer;

[0206] The paint tank is filled with HI-409-2803 polyimide paint;

[0207] Step 2: Apply 22 to 23 coats of mid-coat:

[0208] (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 450°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I.

[0209] The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I.

[0210] The paint tank is filled with corona-resistant paint;

[0211] (2) Apply 5 to 8 coats of mid-coat II: The copper flat wire coated with mid-coat I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat II through a paint tank. The excess mid-coat II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 450°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat II.

[0212] The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II.

[0213] The paint tank is filled with PDIV-enhanced paint;

[0214] Step 3, apply 6 coats of topcoat:

[0215] The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven from the bottom port for cross-linking and curing, with the curing zone temperature at 450°C. The cured copper flat wire exits the top port of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat.

[0216] The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire.

[0217] The paint tank is filled with HI-406GA-30S polyimide paint;

[0218] In this embodiment, the length of the oven is 8 meters.

[0219] The enameled copper flat wire prepared in this embodiment has been tested to have a good anti-corona effect in an 800V motor, achieving a corona resistance of 315h and a PDIV of 1525V. There is no breakdown after 50 tests, no cracking or falling off during winding, and no cracking or falling off at the curved surface.

[0220] Example 8

[0221] 800V drive motor with high PDIV enameled copper wire, such as Figure 1 and 2 As shown, the enameled rectangular copper wire comprises a rectangular copper wire 1 and a paint film 2, wherein the paint film 2 comprises a primer layer 2.1, a mid-coat layer I 2.2, a mid-coat layer II 2.3, and a topcoat layer 2.4; the total thickness of the paint film 2 is 0.30 mm;

[0222] The thickness of the primer layer 2.1 is 0.02mm; the thickness of the intermediate paint layer I 2.2 is 0.15mm, the thickness of the intermediate paint layer II 2.3 is 0.07mm; the thickness of the topcoat layer 2.4 is 0.06mm;

[0223] The primer layer 2.1 is a polyimide paint, model HI-409-2803;

[0224] The middle paint layer I2.2 is a corona-resistant paint. The raw material components of the corona-resistant paint are as follows: 39 parts by mass of xylene, 29 parts of polyethylene wax, 18 parts of tris(2-hydroxyethyl)isocyanurate, 12 parts of nano-glass powder, 27 parts of phenol, 15 parts of 4,4'-diphenylmethane diisocyanate, 16 parts of N-methyl-2-pyrrolidone, 23 parts of ethylene glycol, 12 parts of dimethyl terephthalate, 6 parts of trimellitic anhydride, 5 parts of tetrabutyl titanate, 2 parts of terephthalic acid and 0.2 parts of polydimethylsiloxane;

[0225] The middle paint layer II 2.3 is a corona-resistant protective paint. The raw material components of the corona-resistant protective paint are as follows: 31 parts of 66 nylon, 57 parts of terephthalic acid, 32 parts of cresol, 24 parts of polydiacid, 17 parts of polyethylene, 16 parts of ethylene glycol, 9 parts of xylene, 12 parts of tung oil anhydride, 5 parts of phenolic resin, 12 parts of zinc acetate, 11 parts of glycerin, 3 parts of epoxy resin, and 8 parts of cresol.

[0226] The topcoat layer 2.4 is a polyimide paint, model HI-406GA-30S;

[0227] The enameling method of the corona-resistant high PDIV enameled rectangular copper wire for the 800V drive motor comprises the following steps:

[0228] Step 1, apply 2 coats of primer:

[0229] Applying the first coat of primer: The copper flat wire is conveyed at a speed of 8 to 8.2 m / min, firstly, the primer is applied through the paint tank, and then the excess primer on the surface of the copper flat wire is scraped off through the mold. The thickness of the paint film is controlled at 0.01 to 0.015 mm; then it continues to be conveyed and enters the drying oven from the lower port for cross-linking and curing. The temperature in the curing zone is 440°C. After the cured copper flat wire comes out of the upper port of the drying oven, it is naturally cooled, and the first coat of primer is completed.

[0230] Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer;

[0231] The paint tank is filled with HI-409-2803 polyimide paint;

[0232] Step 2: Apply 22 to 23 coats of mid-coat:

[0233] (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 440°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I.

[0234] The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I.

[0235] The paint tank is filled with corona-resistant paint;

[0236] (2) Apply 5 to 8 coats of mid-coat II: The copper flat wire coated with mid-coat I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat II through a paint tank. The excess mid-coat II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 440°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat II.

[0237] The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II.

[0238] The paint tank is filled with PDIV-enhanced paint;

[0239] Step 3, apply 6 coats of topcoat:

[0240] The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven from the bottom port for cross-linking and curing, with the curing zone temperature at 440°C. The cured copper flat wire exits the top port of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat.

[0241] The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire.

[0242] The paint tank is filled with HI-406GA-30S polyimide paint;

[0243] In this embodiment, the length of the oven is 8 meters.

[0244] The enameled copper flat wire prepared in this embodiment has been tested and has a good anti-corona effect in an 800V motor, achieving a corona resistance of 310h and a PDIV of 1510V. There is no breakdown phenomenon in 80 tests, no cracking or falling off during winding, and no cracking or falling off at the curved surface.

[0245] Example 9

[0246] 800V drive motor with high PDIV enameled copper wire, such as Figure 1 and 2 As shown, the enameled rectangular copper wire comprises a rectangular copper wire 1 and a paint film 2, wherein the paint film 2 comprises a primer layer 2.1, a mid-coat layer I 2.2, a mid-coat layer II 2.3, and a topcoat layer 2.4; the total thickness of the paint film 2 is 0.30 mm;

[0247] The thickness of the primer layer 2.1 is 0.03mm; the thickness of the intermediate paint layer I 2.2 is 0.16mm, the thickness of the intermediate paint layer II 2.3 is 0.05mm; the thickness of the topcoat layer 2.4 is 0.06mm;

[0248] The primer layer 2.1 is a polyimide paint, model HI-409-2803;

[0249] The middle paint layer I2.2 is a corona-resistant paint. The raw material components of the corona-resistant paint are as follows: 35 parts by mass of xylene, 30 parts by mass of polyethylene wax, 15 parts by mass of tris(2-hydroxyethyl)isocyanurate, 15 parts by mass of nano-glass powder, 30 parts by mass of phenol, 16 parts by mass of 4,4'-diphenylmethane diisocyanate, 15 parts by mass of N-methyl-2-pyrrolidone, 24 parts by mass of ethylene glycol, 14 parts by mass of dimethyl terephthalate, 7 parts by mass of trimellitic anhydride, 4 parts by mass of tetrabutyl titanate, 2 parts by mass of terephthalic acid, and 0.3 parts by mass of polydimethylsiloxane.

[0250] The middle paint layer II 2.3 is a corona-resistant protective paint. The raw material components of the corona-resistant protective paint are as follows: 38 parts of 66 nylon, 52 parts of terephthalic acid, 32 parts of cresol, 25 parts of polydiacid, 17 parts of polyethylene, 20 parts of ethylene glycol, 8 parts of xylene, 12 parts of tung oil anhydride, 7 parts of phenolic resin, 13 parts of zinc acetate, 11 parts of glycerin, 3 parts of epoxy resin, and 9 parts of cresol.

[0251] The topcoat layer 2.4 is a polyimide paint, model HI-406GA-30S;

[0252] The enameling method of the corona-resistant high PDIV enameled rectangular copper wire for the 800V drive motor comprises the following steps:

[0253] Step 1, apply 2 coats of primer:

[0254] Apply the first coat of primer: convey the copper flat wire at a speed of 8-8.2m / min, first apply primer through the paint tank, then scrape off excess primer on the surface of the copper flat wire through the mold, and control the paint film thickness at 0.01-0.015mm; then continue conveying and enter the drying oven from the lower port for cross-linking and curing. The temperature in the curing zone is 435℃. After the cured copper flat wire comes out from the upper port of the drying oven, it is naturally cooled, and the first coat of primer is completed.

[0255] Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer;

[0256] The paint tank is filled with HI-409-2803 polyimide paint;

[0257] Step 2: Apply 22 to 23 coats of mid-coat:

[0258] (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 435°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I.

[0259] The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I.

[0260] The paint tank is filled with corona-resistant paint;

[0261] (2) Apply 5 to 8 coats of mid-coat II: The copper flat wire coated with mid-coat I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat II through a paint tank. The excess mid-coat II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 435°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat II.

[0262] The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II.

[0263] The paint tank is filled with PDIV-enhanced paint;

[0264] Step 3, apply 6 coats of topcoat:

[0265] The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven through the lower opening for cross-linking and curing, with the curing zone temperature at 435°C. The cured copper flat wire exits the upper opening of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat.

[0266] The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire.

[0267] The paint tank is filled with HI-406GA-30S polyimide paint;

[0268] In this embodiment, the length of the oven is 8 meters.

[0269] The enameled copper flat wire prepared in this embodiment has been tested to have a good anti-corona effect in an 800V motor, achieving a corona resistance of 326h and a PDIV of 1528V. There is no breakdown after 60 tests, no cracking or falling off during winding, and no cracking or falling off at the curved surface.

Claims

1. 800V corona resistant high PDIV enameled rectangular copper wire for drive motor, characterized by: The enameled copper flat wire comprises a copper flat wire (1) and a paint film (2), wherein the paint film (2) comprises a primer layer (2.1), a mid-coat layer I (2.2), a mid-coat layer II (2.3), and a topcoat layer (2.4); the total thickness of the paint film (2) is 0.28 to 0.30 mm; The thickness of the primer layer (2.1) is 0.02 to 0.03 mm; the thickness of the intermediate paint layer I (2.2) is 0.15 to 0.17 mm; the thickness of the intermediate paint layer II (2.3) is 0.05 to 0.08 mm; and the thickness of the topcoat layer (2.4) is 0.06 to 0.08 mm. The middle paint layer I (2.2) is a corona-resistant paint, and the raw material components of the corona-resistant paint are as follows: 35-40 parts by weight of xylene, 20-30 parts of polyethylene wax, 15-18 parts of tris(2-hydroxyethyl)isocyanurate, 10-20 parts of nano-glass powder, 25-30 parts of phenol, 15-16 parts of 4,4'-diphenylmethane diisocyanate, 15-18 parts of N-methyl-2-pyrrolidone, 22-24 parts of ethylene glycol, 12-14 parts of dimethyl terephthalate, 5-7 parts of trimellitic anhydride, 4-5 parts of tetrabutyl titanate, 1-2 parts of terephthalic acid, and 0.2-0.3 parts of polydimethylsiloxane; The middle paint layer II (2.3) is a corona-resistant protective paint, and the raw material components of the corona-resistant protective paint are as follows: 30-40 parts of 66 nylon, 50-60 parts of terephthalic acid, 30-40 parts of cresol, 20-25 parts of polydiacid, 15-18 parts of polyethylene, 15-20 parts of ethylene glycol, 8-10 parts of xylene, 12-13 parts of tung oil anhydride, 5-7 parts of phenolic resin, 10-13 parts of zinc acetate, 10-12 parts of glycerin, 2-3 parts of epoxy resin, and 8-10 parts of cresol; The primer layer (2.1) and the topcoat layer (2.4) are both polyimide paints; The enameled copper rectangular wire has a corona resistance of more than 300 hours and a PDIV of more than 1500V.

2. The corona-resistant high PDIV enameled rectangular copper wire for an 800V drive motor according to claim 1, characterized in that: The primer layer (2.1) is polyimide paint, model HI-409-2803.

3. The corona-resistant high PDIV enameled rectangular copper wire for an 800V drive motor according to claim 1, characterized in that: The topcoat layer (2.4) is a polyimide paint, model HI-406GA-30S.

4. The corona-resistant high PDIV enameled rectangular copper wire for an 800V drive motor according to claim 1, characterized in that: The enameled copper rectangular wire is suitable for 800V drive motors of new energy vehicles.

5. The method for coating corona-resistant high PDIV enameled rectangular copper wire for 800V drive motor according to claim 1, characterized in that: The steps include: Step 1, apply 2 coats of primer: Applying the first coat of primer: The copper flat wire is conveyed at a speed of 8-8.2m / min. First, the primer is applied through a paint tank. Then, the excess primer on the surface of the copper flat wire is scraped through a mold. The paint film thickness is controlled at 0.01-0.015mm. After that, it continues to be conveyed and enters the drying oven from the bottom port for cross-linking and curing. The temperature in the curing zone is 430-450℃. After the cured copper flat wire comes out of the drying oven from the top port, it is naturally cooled. The first coat of primer is applied. Applying the second coat of primer: The copper flat wire coated with the first coat of primer is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled to form the copper flat wire coated with primer; The paint tank is filled with HI-409-2803 polyimide paint; Step 2: Apply 22 to 23 coats of mid-coat: (1) Applying 15 to 17 coats of mid-coat I: The copper flat wire coated with primer is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with mid-coat I through a paint tank. The excess mid-coat I on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the mid-coat I on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 430 to 450°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of mid-coat I. The copper flat wire coated with the first coat of intermediate paint I is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 15 to 17 coats of intermediate paint I are applied, thereby producing the copper flat wire coated with intermediate paint I. The paint tank is filled with corona-resistant paint; (2) Apply 5 to 8 coats of intermediate paint II: The copper flat wire coated with intermediate paint I is continuously conveyed at a speed of 8 to 8.2 m / min, and is coated with intermediate paint II through a paint tank. The excess intermediate paint II on the surface of the copper flat wire is then scraped off through a mold, and the thickness of the intermediate paint II on the copper flat wire is controlled to be 0.005 to 0.01 mm. The copper flat wire is then continuously conveyed and enters the drying furnace from the lower port for cross-linking and curing. The temperature in the curing zone is 430 to 450°C. The cured copper flat wire is naturally cooled after exiting the upper port of the drying furnace to prepare the copper flat wire coated with the first coat of intermediate paint II. The copper flat wire coated with the first coat of intermediate paint II is recycled and conveyed, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The coating is repeated until 5 to 8 coats of intermediate paint II are applied, thereby producing the copper flat wire coated with intermediate paint II. The paint tank is filled with corona-resistant protective paint; Step 3, apply 6 coats of topcoat: The copper flat wire coated with intermediate paint II is continuously conveyed at a speed of 8-8.2 m / min, passed through a paint tank to be coated with topcoat, and then passed through a die to scrape off excess topcoat on the copper flat wire surface, with the topcoat thickness of the copper flat wire controlled at 0.01-0.015 mm. The copper flat wire is then continuously conveyed and enters a drying oven from the bottom port for cross-linking and curing, with the curing zone temperature at 430-450°C. The cured copper flat wire exits the top port of the drying oven and is naturally cooled, thereby becoming the copper flat wire coated with the first coat of topcoat. The copper flat wire coated with the first coat of topcoat is recycled and transported, passing through the paint tank, mold, and oven in sequence, and then naturally cooled. The topcoat is repeated until 6 coats are applied, thus forming the finished enameled copper flat wire. The paint tank is filled with HI-406GA-30S polyimide paint.

6. The method for coating corona-resistant high PDIV enameled rectangular copper wire for an 800V drive motor according to claim 5, characterized in that: The length of the oven is 8 meters.

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