CN111243783A - Square enameled wire and preparation method thereof - Google Patents
Square enameled wire and preparation method thereof Download PDFInfo
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- CN111243783A CN111243783A CN202010032334.2A CN202010032334A CN111243783A CN 111243783 A CN111243783 A CN 111243783A CN 202010032334 A CN202010032334 A CN 202010032334A CN 111243783 A CN111243783 A CN 111243783A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0009—Details relating to the conductive cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/065—Insulating conductors with lacquers or enamels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/30—Drying; Impregnating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0225—Three or more layers
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Abstract
The invention discloses a square enameled wire and a preparation method thereof, which are mainly used for a new energy electric automobile motor; the square enameled wire comprises an electromagnetic wire conductor, a first insulating layer, a nylon layer, a second insulating layer and a third insulating layer, the cross section of the electromagnetic wire conductor is square with a round corner, the first insulating layer is a polyester imide coating, the second insulating layer is a corona-resistant polyamide imide coating, and the third insulating layer is a polyamide imide coating. The square enameled wire disclosed by the invention is produced by adopting a square conductor with a fillet and adopting a process of a composite coating in a certain proportion relation, so that different paint layers supplement each other, the produced product has the characteristics of lower dielectric loss, excellent hot punching performance, higher softening breakdown temperature, excellent wear resistance, scraping resistance and the like, and a coil made of a wire rod has the characteristic of high power density.
Description
Technical Field
The invention relates to an enameled wire and a preparation method thereof, in particular to a square enameled wire and a preparation method thereof.
Background
With the increasing awareness of people on environmental protection, the electric automobile has increased demand and higher requirements on variety and performance when going into daily life, and provides higher requirements on raw materials, components and the like matched with the electric automobile, so that opportunities and challenges are brought to the development of basic industries of the raw materials, the components and the like.
At present, enameled wires for most of electric automobile driving motors have the defects that the corona resistance of the produced product is poor, the thermal shock resistance is poor and the power density of the motor is not strong due to the simple process, the single paint film and the common round wire or flat wire serving as a conductor structure.
CN101958158B discloses a method for preparing a corona-resistant enameled wire and a product thereof, wherein the corona-resistant enameled wire with three insulation layer structures is formed by adopting polyester corona-resistant paint, polyester imide corona-resistant paint and polyamide imide paint, and the corona-resistant service life of the enameled wire can reach 55 hours at most. But because the 2-layer corona-resistant material paint layer is adopted, the cost is higher, and the method is not suitable for large-scale production of enterprises.
CN104804503B also discloses a corona-resistant enameled wire used in new energy automobiles and a manufacturing method thereof, wherein polyesterimide is used as an inner layer coating, corona-resistant coating is used as an intermediate layer, and polyamide-imide is used as an outer layer coating, the corona-resistant enameled wire can reach a corona-resistant service life of 50 hours at most, but in the production process, the process reaches 20 times, the production steps are complex, and the cost is high.
CN207199331U discloses a 200-grade corona-resistant enameled wire for a new energy automobile driving motor, which adopts a tin layer, polyester imide paint, nylon paint, polyester amide imide paint and polyamide imide paint to form a composite insulating layer enameled wire, although the enameled wire can preliminarily meet the requirements of the motor, 22-28 times are used in the production process, and the process is complex and tedious.
Disclosure of Invention
The square enameled wire obtained by the invention has strong thermal shock resistance, can meet the requirement of high-frequency pulse voltage time of a new energy driving motor, simplifies the production process and reduces the production cost.
The invention provides a square enameled wire to solve the technical problems, which comprises an electromagnetic wire conductor, wherein the cross section of the electromagnetic wire conductor is square, and a first insulating layer, a nylon layer, a second insulating layer and a third insulating layer are sequentially wrapped outside the electromagnetic wire conductor; the first insulating layer is a polyester imide coating, the second insulating layer is a corona-resistant polyamide imide coating, and the third insulating layer is a polyamide imide coating; the thickness of the first insulating layer is 0.015-0.04mm, the thickness of the nylon layer is 0.003-0.008mm, the thickness of the second insulating layer is 0.03-0.08mm, and the thickness of the third insulating layer is 0.01-0.03 mm.
Further, the thickness ratio of the first insulating layer, the nylon layer, the second insulating layer and the third insulating layer is 5: 1: 10: 4.
furthermore, arc angles are formed around the electromagnetic wire conductor in a processing mode.
Furthermore, the side length of the electromagnetic wire conductor is 1.5-4mm, and the radius of the fillet is 0.18-0.5 mm.
The invention also provides a preparation method of the square enameled wire, which comprises the following steps:
s1: extruding the electromagnetic wire conductor on extrusion equipment to form a square wire;
s2: annealing the square wire through an annealing furnace at the speed of 4-20 m/min;
s3: placing the square wire in a cooling water tank for cooling, cleaning and air-drying;
s4: coating polyester imide paint on the surface of the square wire, baking and curing the polyester imide paint to form a first insulating layer, coating nylon paint on the surface of the first insulating layer, baking and curing the nylon paint to form a nylon layer, coating corona-resistant polyamide imide paint on the nylon layer, baking and curing the nylon layer to form a second insulating layer, coating polyamide imide paint on the second insulating layer, baking and curing the polyamide imide paint to form a third insulating layer, and obtaining a square enameled wire;
further, the step S4 includes:
when the temperature of the square wire rod is 35-40 ℃, coating polyester imide paint in 2-3 channels to form a first insulating layer, coating according to a paint film thickness mould with the aperture of the wire rod increased by 0.005-0.013, baking and curing in different channels, and controlling the total thickness of the layer to be 0.015-0.04 mm;
when the temperature of the square wire is 35-40 ℃, coating 1-pass nylon paint on the surface of the first insulating layer to form a nylon layer, and baking and curing the nylon layer, wherein the thickness of the nylon layer is controlled to be 0.003-0.008 mm;
when the temperature of the square wire is 40-45 ℃, coating corona-resistant polyamide-imide paint on the surface of the nylon layer for 4-6 channels to form a second insulating layer, coating according to a paint film thickness mould with the wire aperture increased by 0.048-0.128mm, baking and curing in different channels, and controlling the total thickness of the layer to be 0.03-0.08 mm;
when the temperature of the square wire is 45-50 ℃, coating polyamide-imide paint on the surface of the second insulating layer for 2-3 times to form a third insulating layer, coating according to a paint film thickness mold with the wire aperture increased by 0.058-0.158mm, baking and curing in different ways, and controlling the total thickness of the layer to be 0.01-0.03mm to obtain the square enameled wire.
The baking is that the square wire rod passes through an evaporation zone and a solidification zone of a baking oven at the speed of 5-20 m/min.
Further, the annealing furnace is divided into an inlet area and an outlet area, wherein the temperature of the inlet area is 580-600 ℃, and the temperature of the outlet area is 540-560 ℃.
Further, the drying furnace is divided into an evaporation area and a curing area, wherein the temperature of the evaporation area is 230 ℃ and the temperature of the curing area is 500 ℃ and 350 ℃.
Further, the drying furnace comprises a main circulating fan, a waste discharge fan and a lower furnace opening fan, wherein the rotating speed of the main circulating fan is 1000-.
Compared with the prior art, the invention has the following beneficial effects: the square enameled wire provided by the invention is produced by adopting a square electromagnetic wire conductor with a fillet and adopting a process of composite coating in a certain proportional relation, so that different paint layers are coordinated, and only 13 paint layers are coated, and the produced product has lower dielectric loss, excellent hot punching performance and higher softening breakdown temperature, can further enhance the wear resistance, the scratch resistance and the like, and can further improve the power density characteristic of a coil made of a wire rod.
Drawings
Fig. 1 is a schematic structural view of a square enamel wire according to the present invention.
In the figure:
1-a magnet wire conductor; 2-a first insulating layer; 3-a nylon layer; 4-a second insulating layer; 5-third insulating layer
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to fig. 1, the square enameled wire provided by the present invention includes an electromagnetic wire conductor 1, a first insulation layer 2, a nylon layer 3, a second insulation layer 4, and a third insulation layer 5. The electromagnetic wire conductor 1 is made of copper, the cross section of the electromagnetic wire conductor is square with round corners, the side length is 1.5-4mm, the radius of the round corners is 0.18-0.5mm, the first insulating layer 2 is a polyester imide coating, the thickness of the first insulating layer is 0.015-0.035mm, the thickness of the nylon layer 3 is 0.003-0.008mm, the second insulating layer 4 is a corona-resistant polyamide imide coating, the thickness of the second insulating layer is 0.03-0.07mm, the third insulating layer 5 is a polyamide imide coating, and the thickness of the third insulating layer is 0.01-0.03 mm. The polyester imide coating has good adhesion with a copper wire, but has poor hydrolysis resistance, oil resistance and chemical resistance, and the corona-resistant polyamide imide coating has good corona resistance under a high-voltage and high-frequency state, but has poor adhesion, high cost, and poor leveling property and surface quality. The polyamide-imide coating has good heat resistance, hydrolysis resistance and chemical resistance, and is suitable for being used as an outer coating. And a nylon layer is coated between the first insulating layer and the second insulating layer to increase the mechanical strength of the enameled wire.
In the following examples, the first insulating layer was made of a 180-class polyester imide coating of MT533 type produced by einstein electric insulating material (holy) ltd, the second insulating layer was made of a 200-class corona resistant polyamide imide coating of 38SAS type produced by taiwan fubao chemical ltd, and the third insulating layer was made of a 220-class polyamide imide coating of PAI602 type produced by einstein electric insulating material (holy) ltd.
Example one
The low-oxygen copper rod is extruded into a square bare wire 1 with the side length of 1.6mm on extrusion equipment, the square bare wire 1 is provided with 4 fillets, and the radius of each fillet is 0.2 mm. The square bare wire 1 is annealed by passing through an annealing pipe inlet area and an annealing pipe outlet area of an annealing furnace in the order of 12 m/min, wherein the temperature of the annealing pipe inlet area is controlled to be 580 ℃, and the temperature of the annealing pipe outlet area is controlled to be 540 ℃. And then introducing the square bare wire 1 into a cooling water tank for cooling and cleaning, wherein the temperature of the cooling water tank is 80-90 ℃ deionized water, and then blowing and drying the square bare wire 1 by a fan and controlling the temperature of the square bare wire 1 to be 35-50 ℃.
Coating 2-3 times of polyester imide paint on the surface of a square bare wire 1 to serve as a first insulating layer 2, wherein the thickness of a paint film is as follows: 0.020 mm; then coating 1 a high mechanical strength nylon layer 3 on the surface of the first insulating layer 2, wherein the thickness of a paint film is as follows: 0.004 mm; then 6 times of corona-resistant polyamide-imide paint is coated on the surface of the high-mechanical-strength nylon layer 3 to serve as a second insulating layer 4, and the thickness of a paint film is as follows: 0.040 mm; then 2 times of polyamide-imide paint is coated on the surface of the second insulating layer 4 to serve as a third insulating layer 5 for improving thermal property, high mechanical strength and chemical resistance, and the thickness of a paint film is as follows: 0.016 mm; and obtaining the square enameled wire.
The square enameled wire is baked through an oven evaporation zone and an oven curing zone in sequence at the speed of 12 m/min, the temperature of the oven entrance zone is 220 ℃, the temperature of the oven evaporation zone is controlled at 300 ℃, the temperature of the oven middle zone is 380 ℃, the temperature of the oven curing zone is controlled at 400 ℃, the temperature of the oven before primary catalysis is controlled at 480 ℃, the rotating speed of a main circulating fan of the oven is controlled at 1300r/min, the rotating speed of a waste discharging fan of the oven is controlled at 800r/min, and the rotating speed of a lower oven mouth fan of the oven is controlled at 1100 r/min.
Coating wire arranging oil on the surface of the square enameled wire and precisely arranging the square enameled wire on a take-up reel.
And (3) carrying out high-frequency pulse voltage resistance test on the obtained square enameled wire, wherein the high-frequency pulse voltage resistance time in a normal state is more than 60 hours, and the high-frequency pulse voltage resistance time after stretching is more than 40 hours.
Example two
The second embodiment is the same as the first embodiment in the case of the square bare wire 1, and the temperature and the wind speed of the baking oven are also the same. The difference is that 3 times of polyester imide paint is coated on the surface of the square bare wire 1 to be used as a first insulating layer, and the thickness of the paint film is 0.024 mm; then 6 tracks of corona-resistant polyamide-imide paint is coated on the surface of the first insulating layer to serve as a corona-resistant layer, and the thickness of the paint film is 0.040 mm; and then 2 courses of polyamide-imide paint is coated on the surface of the corona-resistant polyamide-imide paint to serve as an insulating layer for improving the thermal property, the high mechanical strength and the chemical resistance, and the thickness of a paint film is 0.016 mm.
And (3) carrying out high-frequency pulse voltage resistance test on the obtained square enameled wire, wherein the high-frequency pulse voltage resistance time in a normal state is more than 58 hours, and the high-frequency pulse voltage resistance time after stretching is more than 35 hours.
EXAMPLE III
The third embodiment is the same as the first embodiment in the case of the square bare wire 1, and the temperature and the wind speed of the baking oven are also the same. The difference is that 2 times of polyester imide paint is coated on the surface of a square bare wire 1 to serve as a first insulating layer, and the thickness of the paint film is 0.020 mm; then coating 1 path of a high-mechanical-strength nylon layer on the surface of the first insulating layer, wherein the thickness of a paint film is 0.004mm, and coating 8 paths of polyamide-imide paint on the surface of the high-mechanical-strength nylon layer, wherein the thickness of the paint film is 0.056 mm.
And (3) carrying out high-frequency pulse voltage resistance test on the obtained square enameled wire, wherein the high-frequency pulse voltage resistance time in a normal state is more than 33 hours, and the high-frequency pulse voltage resistance time after stretching is more than 20 hours.
Example four
Example four differs from example three in that the polyamideimide paint was replaced with a corona resistant polyamideimide paint and the paint film thickness was the same.
And (3) carrying out high-frequency pulse voltage resistance test on the obtained square enameled wire, wherein the high-frequency pulse voltage resistance time in a normal state is more than 60 hours, and the high-frequency pulse voltage resistance time after stretching is more than 40 hours.
EXAMPLE five
The low-oxygen copper rod is extruded into a square bare wire 1 with the side length of 2.25mm on extrusion equipment, the square bare wire 1 is provided with 4 fillets, and the radius of each fillet is 0.28 mm. The square bare wire 1 is annealed by passing through an annealing pipe inlet area and an annealing pipe outlet area of an annealing furnace in the order of 8 m/min, wherein the temperature of the annealing pipe inlet area is controlled to be 580 ℃, and the temperature of the annealing pipe outlet area is controlled to be 550 ℃. And then introducing the square bare wire 1 into a cooling water tank for cooling and cleaning, wherein the temperature of the cooling water tank is 80-90 ℃ deionized water, and then blowing and drying the square bare wire 1 by a fan and controlling the temperature of the square bare wire 1 to be 35-50 ℃.
Coating 2-3 times of polyester imide paint on the surface of a square bare wire 1 to serve as a first insulating layer 2, wherein the thickness of a paint film is as follows: 0.022-0.03 mm; then coating 1 a high mechanical strength nylon layer 3 on the surface of the first insulating layer 2, wherein the thickness of a paint film is as follows: 0.004-0.006 mm; then 4-6 times of corona-resistant polyamide-imide paint is coated on the surface of the high-mechanical-strength nylon layer 3 to serve as a second insulating layer 4, and the thickness of a paint film is as follows: 0.045-0.055 mm; and then 2-3 times of polyamide imide paint is coated on the second insulating layer 4 to serve as a third insulating layer 5 for improving the thermal property, the high mechanical strength and the chemical resistance, and the thickness of a paint film is as follows: 0.018-0.022 mm; and obtaining the square enameled wire.
The square enameled wire is baked through an oven evaporation zone and an oven curing zone in sequence at the speed of 8 m/min, the temperature of the oven evaporation zone is controlled at 200 ℃, the temperature of the oven curing zone is controlled at 420 ℃, the temperature of the oven before primary catalysis is controlled at 480 ℃, the rotating speed of a main circulating fan of the oven is controlled at 1500r/min, the rotating speed of a waste discharge fan of the oven is controlled at 800r/min, and the rotating speed of a lower furnace opening fan of the oven is controlled at 1100 r/min.
Coating wire arranging oil on the surface of the square enameled wire and precisely arranging the square enameled wire on a take-up reel.
And (3) carrying out high-frequency pulse voltage resistance test on the obtained square enameled wire, wherein the time of the high-frequency pulse voltage resistance test is 40 hours.
EXAMPLE six
The low-oxygen copper rod is extruded into a square bare wire 1 with the side length of 3.35mm on extrusion equipment, the square bare wire 1 is provided with 4 fillets, and the radius of each fillet is 0.42 mm. The square bare wire 1 is annealed by passing through an annealing pipe inlet area and an annealing pipe outlet area of an annealing furnace in a speed sequence of 5 m/min, wherein the temperature of the annealing pipe inlet area is controlled to be 600 ℃, and the temperature of the annealing pipe outlet area is controlled to be 550 ℃. And then introducing the square bare wire 1 into a cooling water tank for cooling and cleaning, wherein the temperature of the cooling water tank is 80-90 ℃ deionized water, and then blowing and drying the square bare wire 1 by a fan and controlling the temperature of the square bare wire 1 to be 35-50 ℃.
Coating 2-3 layers of polyester imide paint on the surface of a square bare wire 1 to serve as a first insulating layer 2, and controlling the total thickness of a paint film of the layer to be 0.03 mm; then coating 1 times of a high-mechanical-strength nylon layer 3 on the surface of the first insulating layer, wherein the thickness of a paint film is 0.006 mm; then 4-6 times of corona-resistant polyamide-imide paint is coated on the surface of the high-mechanical-strength nylon layer 3 to serve as a second insulating layer 4, and the total thickness of a paint film of the layer is controlled to be 0.06 mm; coating 2-3 times of polyamide-imide paint on the second insulating layer 4 to serve as a third insulating layer 5 for improving thermal performance, high mechanical strength and chemical resistance, and controlling the thickness of a paint film of the third insulating layer to be 0.024 mm; and obtaining the square enameled wire.
The square enameled wire is baked through an evaporation zone and a curing zone of a baking oven in a speed sequence of 5 m/min, the temperature of the evaporation zone of the baking oven is controlled at 200 ℃, the temperature of the curing zone of the baking oven is controlled at 480 ℃, the temperature of the baking oven before primary catalysis is controlled at 480 ℃, the rotating speed of a main circulating fan of the baking oven is controlled at 1500r/min, the rotating speed of a waste discharge fan of the baking oven is controlled at 800r/min, and the rotating speed of a lower furnace opening fan of the baking oven is controlled at 1100 r/min.
Coating wire arranging oil on the surface of the square enameled wire and precisely arranging the square enameled wire on a take-up reel.
And carrying out high-frequency pulse voltage resistance test on the obtained square enameled wire, wherein the time of the high-frequency pulse voltage resistance test is 45 hours.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A square enameled wire is characterized by comprising an electromagnetic wire conductor, wherein the cross section of the electromagnetic wire conductor is square, and a first insulating layer, a nylon layer, a second insulating layer and a third insulating layer are sequentially wrapped outside the electromagnetic wire conductor; the first insulating layer is a polyester imide coating, the second insulating layer is a corona-resistant polyamide imide coating, and the third insulating layer is a polyamide imide coating; the thickness of the first insulating layer is 0.015-0.04mm, the thickness of the nylon layer is 0.003-0.008mm, the thickness of the second insulating layer is 0.03-0.08mm, and the thickness of the third insulating layer is 0.01-0.03 mm.
2. The square enameled wire according to claim 1, wherein the thickness ratio of the first insulating layer, the nylon layer, the second insulating layer and the third insulating layer is 5: 1: 10: 4.
3. the square enameled wire according to claim 1, wherein the periphery of the magnet wire conductor is processed to form a circular arc angle.
4. The square enameled wire according to claim 3, wherein the side length of the electromagnetic wire conductor is 1.5-4mm, and the radius of the fillet is 0.18-0.5 mm.
5. A method for preparing a square enameled wire, wherein the square enameled wire is the square enameled wire according to claim 1, and the preparation method comprises the following steps:
s1: extruding the electromagnetic wire conductor on extrusion equipment to form a square wire;
s2: annealing the square wire through an annealing furnace at the speed of 4-20 m/min;
s3: placing the square wire in a cooling water tank for cooling, cleaning and air-drying;
s4: coating polyester imide paint on the surface of the square wire, baking and curing the polyester imide paint to form a first insulating layer, coating nylon paint on the surface of the first insulating layer, baking and curing the nylon paint to form a nylon layer, coating corona-resistant polyamide imide paint on the nylon layer, baking and curing the nylon layer to form a second insulating layer, coating polyamide imide paint on the second insulating layer, baking and curing the polyamide imide paint to form a third insulating layer, and obtaining the square enameled wire.
6. The method for preparing a square enameled wire according to claim 5, wherein the step S4 includes:
when the temperature of the square wire rod is 35-40 ℃, coating polyester imide paint in 2-3 channels to form a first insulating layer, coating according to a paint film thickness mould with the aperture of the wire rod increased by 0.005-0.013, baking and curing in different channels, and controlling the total thickness of the layer to be 0.015-0.04 mm;
when the temperature of the square wire is 35-40 ℃, coating 1-pass nylon paint on the surface of the first insulating layer to form a nylon layer, and baking and curing the nylon layer, wherein the thickness of the nylon layer is controlled to be 0.003-0.008 mm;
when the temperature of the square wire is 40-45 ℃, coating corona-resistant polyamide-imide paint on the surface of the nylon layer for 4-6 channels to form a second insulating layer, coating according to a paint film thickness mould with the wire aperture increased by 0.048-0.128mm, baking and curing in different channels, and controlling the total thickness of the layer to be 0.03-0.08 mm;
when the temperature of the square wire is 45-50 ℃, coating polyamide-imide paint on the surface of the second insulating layer for 2-3 times to form a third insulating layer, coating according to a paint film thickness mold with the wire aperture increased by 0.058-0.158mm, baking and curing in different ways, and controlling the total thickness of the layer to be 0.01-0.03mm to obtain the square enameled wire.
The baking is that the square wire rod passes through an evaporation zone and a solidification zone of a baking oven at the speed of 5-20 m/min.
7. The method for preparing a square enameled wire according to claim 6, wherein the annealing furnace is divided into an inlet region and an outlet region, the temperature of the inlet region is 580-600 ℃, and the temperature of the outlet region is 540-560 ℃.
8. The method for preparing a square enameled wire according to claim 6, wherein the baking furnace is divided into an evaporation zone and a solidification zone, the temperature of the evaporation zone is 200-230 ℃, and the temperature of the solidification zone is 350-500 ℃.
9. The method for preparing the square enameled wire according to claim 8, wherein the baking furnace comprises a main circulating fan, a waste discharge fan and a lower furnace mouth fan, wherein the rotating speed of the main circulating fan is 1000-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010032334.2A CN111243783A (en) | 2020-01-13 | 2020-01-13 | Square enameled wire and preparation method thereof |
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| CN202010032334.2A CN111243783A (en) | 2020-01-13 | 2020-01-13 | Square enameled wire and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113314254A (en) * | 2021-06-03 | 2021-08-27 | 珠海格力电工有限公司 | Corona-resistant enameled wire |
| CN114724744A (en) * | 2022-03-24 | 2022-07-08 | 上海蔚兰动力科技有限公司 | Corona-resistant enameled wire for motor, preparation method of corona-resistant enameled wire and flat wire motor |
-
2020
- 2020-01-13 CN CN202010032334.2A patent/CN111243783A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113314254A (en) * | 2021-06-03 | 2021-08-27 | 珠海格力电工有限公司 | Corona-resistant enameled wire |
| CN114724744A (en) * | 2022-03-24 | 2022-07-08 | 上海蔚兰动力科技有限公司 | Corona-resistant enameled wire for motor, preparation method of corona-resistant enameled wire and flat wire motor |
| CN114724744B (en) * | 2022-03-24 | 2024-01-09 | 上海蔚兰动力科技有限公司 | Corona-resistant enameled wire for motor, preparation method of corona-resistant enameled wire and flat wire motor |
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