CN215770563U - Corona-resistant enameled wire - Google Patents
Corona-resistant enameled wire Download PDFInfo
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- CN215770563U CN215770563U CN202121241701.6U CN202121241701U CN215770563U CN 215770563 U CN215770563 U CN 215770563U CN 202121241701 U CN202121241701 U CN 202121241701U CN 215770563 U CN215770563 U CN 215770563U
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Abstract
The utility model discloses a corona-resistant enameled wire which comprises a metal conductor core wire, wherein a composite insulating layer is coated on the outer wall of the metal conductor core wire, and the composite insulating layer comprises a polyester imide coating, a polyamide imide coating and a self-lubricating paint which are sequentially arranged from inside to outside. According to the corona-resistant enameled wire provided by the utility model, the corona-resistant enameled wire with new proportioning components is prepared by improving the components of the existing enameled wire, adding the polyester-imide insulating paint and improving the proportion of the polyester-imide insulating paint through a controlled variable experiment, so that the production cost is reduced and the adhesiveness of the corona-resistant enameled wire is improved.
Description
Technical Field
The utility model belongs to the technical field of enameled wires, and particularly relates to a corona-resistant enameled wire.
Background
In recent years, the frequency conversion technology is widely applied to the fields of wind power generation, high-speed motor cars, new energy main drive motors and the like due to the advantages of energy conservation, strong reliability, stable operation, low energy consumption and the like. However, the inverter motors for providing power for these fields are loaded with extremely high frequency and overvoltage for a long time when in working state, and these high frequency and high voltage are easy to generate corona phenomenon between enamelled wires in the motors, so that the insulation materials in the inverter motors fail prematurely.
Currently, an effective method to solve the above problems is to use corona-resistant enameled wires instead of ordinary enameled wires. The corona-resistant enameled wire is characterized in that 2% -5% of nano-scale inorganic corona-resistant (SiO2, Al2O3 and TiO2) materials are added into a common enameled wire by a physical (mechanical blending method) or chemical bonding (solution gel method, intercalation method, in-situ polymerization method and plasma method), and compared with the common enameled wire, the inorganic nano-materials are expensive, so that the price of the corona-resistant enameled wire is about twice that of the common enameled wire; on the other hand, due to the introduction of the inorganic nano material, the adhesiveness of the corona-resistant insulating paint film and the metal copper conductor is reduced, and in the winding process, the corona-resistant enameled wire paint film is easily separated from the metal conductor, so that poor withstand voltage or turn-to-turn breakdown is caused, and the quality of the variable frequency motor is seriously influenced.
Therefore, the research on the low-cost high-adhesion corona-resistant enameled wire is of great significance.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems of high cost and low adhesion of the corona-resistant enameled wire in the background art, the utility model provides the corona-resistant enameled wire, which reduces the production cost by adjusting the components of the enameled wire and effectively improves the technical problem of poor adhesion of the traditional corona-resistant enameled wire.
In order to achieve the purpose, the specific technical scheme of the corona-resistant enameled wire is as follows:
a corona-resistant enameled wire comprises a metal conductor core wire, wherein the outer wall of the metal conductor core wire is coated with a polyester-imide coating, a polyamide-imide coating and a self-lubricating paint coating which are sequentially arranged from inside to outside.
Further, the thickness of the polyester imide coating is not less than 43 mm.
Further, the polyamide-imide coating is a corona-resistant polyamide-imide coating, and a corona-resistant polyester-imide coating is arranged between the polyester-imide coating and the corona-resistant polyamide-imide coating.
Further, the thickness of the polyester imide coating is not less than 5 mm.
Further, the ratio of the thickness of the polyester-imide coating layer to the total thickness of the composite insulating layer was 10%.
Further, the polyamideimide coating is a corona resistant polyamideimide coating.
Further, the ratio of the thickness of the polyester-imide coating to the total thickness of the composite insulating layer is 24-50%.
Further, a corona-resistant polyester imide coating is arranged between the polyester imide coating and the polyamide imide coating, and a corona-resistant polyamide imide coating is arranged between the polyamide imide coating and the self-lubricating paint coating.
Further, the thickness of the polyester imide coating is not less than 22 mm.
Further, the polyester-imide coating is a corona-resistant polyester-imide coating.
The corona-resistant enameled wire has the following advantages: according to the corona-resistant enameled wire provided by the utility model, the corona-resistant enameled wire with new proportioning components is prepared by improving the components of the existing enameled wire, adding the polyester-imide coating and improving the proportion of the polyester-imide coating through a controlled variable experiment, so that the production cost is reduced and the adhesiveness of the corona-resistant enameled wire is improved.
Drawings
Fig. 1 is a schematic structural diagram of a corona-resistant enameled wire of the utility model.
The notation in the figure is:
1. a copper core; 2. a polyester-imide coating; 3. corona resistant polyester-imide coatings; 4. a corona resistant polyamideimide coating; 5. self-sliding paint coating.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical features mentioned in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.
Corona resistant enameled wires according to some embodiments of the present invention are described below with reference to fig. 1.
The alternating current variable frequency motor has the advantages of energy conservation, good speed regulation performance, capability of realizing stepless speed regulation, rapid braking and the like, and is widely applied to the industries of household appliances, elevators, railways, metallurgy and the like. However, the problem of premature failure of the insulation system of the variable frequency motor is also caused by the use of the variable frequency power supply, so that the improvement of the insulation system of the motor, particularly the improvement of the corona resistance of the electromagnetic wire, is a main way for prolonging the service life of the variable frequency motor. And the corona-resistant enameled wire can effectively solve the problems. The corona-resistant enameled wire is generally insulated by adopting a composite coating, wherein an outer layer (two-layer composite) or an intermediate layer (three-layer composite) is a composite of a high-temperature-resistant polymer and a nano material, and the thickness of the composite coating is about 40-60% of the thickness of the integral insulation. However, because the thickness of the corona-resistant insulating layer is limited in proportion to the thickness of the entire insulating layer, the corona-resistant performance is also limited. According to some embodiments provided by the utility model, the component ratio of the existing corona-resistant enameled wire is changed through research, so that the technical problems of high cost and poor adhesion in the production process of the existing corona-resistant enameled wire are solved.
In a first embodiment, the corona-resistant enameled wire includes a metal conductor core, the metal conductor core is generally disposed on an innermost layer of the corona-resistant enameled wire, and the metal conductor is generally a copper core 1, but may also be made of other metal conductors, specifically, an aluminum core, a copper-clad aluminum core, or other metal conductors, which is not specifically limited herein, and as long as the metal conductor is within the protection scope of the embodiments of the present invention.
Further, the outer wall of the copper core 1 is coated with a composite insulating layer, the composite insulating layer is formed by coating a primer layer on the outer wall of the copper core 1, the primer layer is a polyester imide coating 2, a corona-resistant polyester imide coating 3, a corona-resistant polyamide imide coating 4 and a self-sliding paint coating 5 which are sequentially arranged on the outer wall of the copper core 1, compared with the traditional corona-resistant paint covered wire structure, the first specific embodiment provided by the utility model takes the polyester imide coating 2 as a first paint for producing a corona-resistant enameled wire, the production cost is reduced by increasing the first paint coated with the polyester imide coating 2, the adhesion of the corona-resistant enameled wire is improved, but as the proportion of the thickness of the polyester imide coating 2 in the corona-resistant enameled wire to the total thickness of the enameled wire composite insulating layer is increased, the corona resistance is gradually deteriorated, through experimental research, the proportion of the thickness of the polyester imide coating 2 to the total thickness of the enameled wire composite insulating layer is changed, can prepare corona-resistant enameled wires with low production cost and high adhesiveness. The composite insulating layer provided in this example comprises four coats of lacquer, the first coat (polyester imide coating 2): the main functions are to enhance the adhesion between a paint film and a metal conductor core wire and reduce the production cost; second layer of lacquer (corona resistant polyester imide coating 3): the main functions are to enhance the corona resistance of the paint film, partially enhance the flexibility of the paint film and reduce the cost; because the paint film is flexible: the polyester-imide coating 2> corona-resistant polyester-imide coating 3> corona-resistant polyamide-imide coating 4; the cost is high and low: the polyester imide coating 2< corona resistant polyester imide coating 3< corona resistant polyamide imide coating 4; third layer of lacquer (corona resistant polyamideimide coating 4): the main function is to enhance the corona resistance and higher heat resistance of the paint film; fourth layer of paint (self-slip paint coat 5): the sliding property of the paint film is reduced, namely the friction coefficient of the paint film is reduced. The paint usage ratio of corona resistant enameled wire in the prior art to the enameled wire provided by one embodiment of the present invention is shown by table 1.
TABLE 1
As shown in Table 1, Table 1 shows the ratio of varnish used in each part of the conventional corona-resistant enameled wire and the corona-resistant enameled wire provided by one embodiment of the present invention, and in some embodiments of the present invention, corona-resistant enameled wires with different proportional components are prepared by changing the ratio of the polyester imide coating 2 (the ratio of the thickness of the polyester imide coating 2 to the total thickness of the composite insulation layer), and only the examples shown in the graph are used for analysis.
At present, the overall thickness of the composite insulating layer of the enameled wire is set to be 90um, the conventional corona-resistant enameled wire is used in comparative example 1, the coating sequence of each layer of paint in the composite insulating layer of the conventional corona-resistant enameled wire is sequentially set to be a corona-resistant polyester imide coating 3, a corona-resistant polyamide imide coating 4 and a self-sliding paint coating 5, and the paint surface thickness of each layer of paint in the composite insulating layer is set to be: the corona-resistant polyester imide coating 3 is 43mm, the corona-resistant polyamide imide coating 4 is 44mm, the surface layer of the self-sliding paint is 3mm, and the thickness of each part of the paint surface of the traditional corona-resistant enameled wire is fixed. The thickness of each paint finish of some of the examples presented herein is illustrated by one comparative example and four example comparative examples, respectively.
The coating sequence of each layer of paint in the composite insulating layer in embodiment 1 provided by the utility model is sequentially set to be a polyester imide coating 2, a corona-resistant polyester imide coating 3, a corona-resistant polyamide imide coating 4 and a self-sliding paint surface layer, wherein the paint surface thickness of each layer of paint in the composite insulating layer is set to be 25mm of the polyester imide coating, 38mm of the corona-resistant polyester imide coating 3, 44mm of the corona-resistant polyamide imide coating 4 and 3mm of the self-sliding paint surface layer, and the thickness of the polyester imide coating 2 accounts for 5.5% of the total thickness of the composite insulating layer. The coating sequence and the composition of each paint surface in example 2, example 3 and example 4 are the same as in example 1, and only the thicknesses of the polyester imide coating 2 and the corona resistant polyester imide coating 3 are changed, and the thicknesses of the corona resistant polyamide imide coating 4 and the self-lubricating paint surface layer are not specifically changed. In example 2, the polyester imide coating 2 was set to 9mm, the corona resistant polyester imide coating 3 was set to 34mm, and the thickness of the polyester imide coating 2 was 10% of the total thickness of the composite insulating layer. In example 3, the polyester imide coating 2 was set to 14mm, the corona resistant polyester imide coating 3 was set to 29mm, and the thickness of the polyester imide coating 2 was 15.5% of the total thickness of the composite insulating layer. In example 3, the polyester imide coating 2 was set to 18mm, the corona resistant polyester imide coating 3 was set to 25mm, and the thickness of the polyester imide coating 2 was 20% of the total thickness of the composite insulating layer.
By providing the above one example and four comparative examples, the adhesion, corona resistance and production cost of the five corona-resistant enameled wires are compared and analyzed, and a corona-resistant enameled wire with low production cost, high adhesion and good corona resistance is further provided. The adhesion of different corona resistant enameled wires is shown by the following table 2.
TABLE 2
Table 2 shows the glass twists in example 1 and comparative examples 1, 2, 3, 4, the national standard (GB/T4074.3-2008-T) states that for a round enameled wire with a conductor nominal diameter φ ≦ 1.00, the paint adhesion is characterized by a snap test, φ > 1.00, the paint adhesion is characterized by a peel twist, since φ in this embodiment is 1.06, the adhesion of the paint is characterized by a peel twist test, as the data in Table 2 show, the average value of peel twist in comparative example 1 is 109/rev, the average value of peel twist in example 1 is 113.3/rev, the average value of peel twist in example 2 is 120.3/rev, the average value of peel twist in example 3 is 123.7/rev, the average value of peel twist in example 4 is 125/rev, which was obtained by experimental data, examples 2, 3, 4, The average value of the stripping twist of example 4 is larger than that of comparative example 1, which shows that the average value of the stripping twist of the corona resistant enameled wire with increasing polyesterimide coating 2 is obviously improved, but the proportion of the increase of the stripping twist is gradually reduced as the proportion of the thickness of the polyesterimide coating 2 to the thickness of the composite insulation layer is gradually increased.
Generally, the corona resistance time of the corona resistant enameled wire is required to be more than 30h under the conditions that the voltage is 3.0kV, the frequency is 20kHz, the temperature is 155 ℃, and the rising edge time is 100ns, the following table shows that the comparative example 1 and the examples 1, 2, 3 and 4 are respectively tested, and the table 3 shows that the corona resistant enameled wires have different corona resistance.
TABLE 3
Table 3 shows the corona resistance time of different corona resistant enameled wires, and the average value of the minimum value and the intermediate value of the corona resistance is generally used as the corona resistance time of the sample according to the corona resistance calculation time in the prior art. As shown in Table 3, the corona resistant time of examples 1, 2, 3 and 4 is lower than that of comparative example 1, but the corona resistant time of example 1 still satisfies the requirement of use.
The polyester imide coating 2 is coated in the composite insulating layer of the corona-resistant enameled wire, so that the production cost of the corona-resistant enameled wire is reduced, and as shown in the following table 4, the paint cost of comparative example 1 and the paint cost of examples 1, 2, 3 and 4 are respectively shown.
TABLE 4
Table 4 shows that the cost of the lacquer used in comparative example 1 without the polyester imide coating 2 is 7.59 yuan, the thickness of the polyester imide coating 2 in the example accounts for 5.5% of the total thickness of the composite insulating layer, the cost of the lacquer used is 7.07 yuan, the thickness of the polyester imide coating 2 accounts for 10% of the total thickness of the composite insulating layer, the cost of the lacquer used is 6.62 yuan, the thickness of the polyester imide coating 2 accounts for 15.5% of the total thickness of the composite insulating layer, the cost of the lacquer used is 5.83 yuan, the thickness of the polyester imide coating 2 accounts for 20% of the total thickness of the composite insulating layer, the cost of the lacquer used is 4.96 yuan, and the costs of examples 1, 2, 3, and 4 are significantly lower than the production cost in comparative example 1.
Through comprehensive analysis of experimental data in tables 1 to 4, the adhesion of the corona-resistant enameled wire provided by the utility model is remarkably improved as the ratio of the thickness of the polyesterimide coating 2 to the total thickness of the composite insulating layer is increased. The production cost is gradually reduced, and the corona resistance is gradually reduced. Preferably, when the thickness of the polyesterimide coating 2 accounts for 10% of the total thickness of the composite insulation layer, the corona-resistant time still meets the requirement, the cost of the corona-resistant enameled wire is reduced by about 14.65%, and the paint film adhesion is improved by about 10.40%. Therefore, the proportion of the thickness of the polyester-imide coating layer 2 to the total thickness of the composite insulating layer is 10%, and the comprehensive performance of the corona-resistant enameled wire is optimal.
The comparative example 1 and the examples 1, 2, 3 and 4 described above are all produced under the same production process conditions, specifically, the temperature of the paint box is 50 ± 10 ℃, the curing temperature is 580 ± 10 ℃, the annealing i/ii is 580/560 ± 10 ℃, corona-resistant enameled wires with the conductor nominal diameter phi of 1.06mm and the paint film thickness H of 90um are prepared, and the corona-resistant enameled wires are suitable for the production process flow of corona-resistant enameled wires such as corona-resistant enameled aluminum round wires, corona-resistant copper-clad aluminum round wires, corona-resistant flat wires and the like besides corona-resistant enameled round wires. The preparation method of the corona-resistant enameled wire mainly comprises the production process flows of paying off, continuous drawing, cleaning, annealing, cooling, painting, baking, cooling, detecting, lubricating, taking up and the like, and is not specifically described in detail herein.
In a second specific embodiment, the corona-resistant enameled wire includes a metal conductor core wire, the metal conductor core wire is generally disposed on the innermost layer of the corona-resistant enameled wire, and the metal conductor is generally a copper core 1, but may also be made of other metal conductors, specifically, an aluminum core, a copper-clad aluminum core, or other metal conductors, which is not specifically limited herein, and as long as the metal conductor is within the protection scope of the embodiment of the present invention.
Further, the outer wall of the copper core 1 is coated with a primer layer, the primer layer is a polyester imide coating 2 which is sequentially arranged on the outer wall of the copper core 1, the outer part of the primer layer is coated with a corona-resistant polyester imide coating 3, a corona-resistant polyamide imide coating 4 and a self-lubricating paint coating 5, wherein the polyester imide coating 2 partially or completely replaces the corona-resistant polyester imide coating 3, in the second specific embodiment provided by the utility model, the polyester imide coating 2 is used as a first paint for producing a corona-resistant enameled wire, the first paint for coating the polyester imide coating 2 is increased to reduce the production cost and improve the adhesiveness of the corona-resistant enameled wire, but as the proportion component of the thickness of the polyester imide coating 2 in the corona-resistant enameled wire to the total thickness of the enameled wire composite insulating layer is increased, the corona resistance is gradually deteriorated, through experimental research, the proportion component of the thickness of the polyester imide coating 2 to the total thickness of the enameled wire composite insulating layer is changed, can prepare corona-resistant enameled wires with low production cost and high adhesiveness. In a use scene with low corona resistance time requirement, the polyester imide coating 2 can partially or completely replace the corona resistance polyester imide coating 3 to reduce the production cost to the maximum extent and meet the use requirement of a user. As shown in Table 5, the corona resistance time of the polyesterimide coating 3 is partially or completely replaced by the percentage of the thickness of the polyesterimide coating 2 to the total thickness of the composite insulation layer of the enameled wire.
TABLE 5
As shown in Table 5, according to different use requirements of users, aiming at the characteristic that the requirement on corona-resistant time proposed by users is not high, and simultaneously meeting the problems of certain adhesiveness and furthest reduction of production cost, in comparative example 1, namely a traditional corona-resistant enameled wire, the coating sequence of each layer of paint in a composite insulating layer of the traditional corona-resistant enameled wire is sequentially set to be a corona-resistant polyester imide coating 3, a corona-resistant polyamide imide coating 4 and a self-sliding paint coating 5, the paint surface thickness of each layer of paint in the composite insulating layer is set to be 43mm for the corona-resistant polyester imide coating 3, 44mm for the corona-resistant polyamide imide coating 4, 3mm for the self-sliding paint coating, and 42.3 hours for the corona-resistant time, the corona-resistant enameled wire provided in example 5 is provided, the polyester imide coating 2 is set to be 22mm, the corona-resistant polyester imide coating 3 is set to be 21mm, the corona-resistant polyamide imide coating 4 is 44mm, and, The surface layer of the self-sliding paint is a 3mm polyester-imide coating 2, and the thickness of the coating accounts for 24.4% of the total thickness of the composite insulating layer. In example 6, the polyester imide coating 2 was set to 43mm, the corona resistant polyester imide coating 3 was set to 0mm, and the thickness of the polyester imide coating 2 accounted for 47.8% of the total thickness of the composite insulating layer. In example 6, the polyesterimide coating 2 is completely substituted for the corona-resistant polyesterimide coating 3, the corona resistance time in example 5 is 11.7 hours, and the corona resistance time in example 6 is 4.2 hours, so that although the corona resistance time of the example is reduced compared with that of example 5, the use requirement of users is met, one layer of corona-resistant polyesterimide coating 3 is reduced in the processing technology, and the production cost is reduced.
In a third embodiment, the corona-resistant enameled wire includes a metal conductor core wire, the metal conductor core wire is generally disposed on an innermost layer of the corona-resistant enameled wire, and the metal conductor core wire is generally a copper core 1, but may also be made of other metal conductors, specifically, an aluminum core, a copper-clad aluminum core, or other metal conductor core wires, which is not specifically limited herein, and as long as the metal conductor core wire is within the protection scope of the embodiment of the present invention.
Further, the outer wall of the copper core 1 is coated with a corona-resistant polyester imide coating 3, a corona-resistant polyamide imide coating 4 and a self-sliding paint coating 5, wherein the common polyamide imide coating partially or completely replaces the corona-resistant polyamide imide coating 4, in the third specific embodiment provided by the utility model, the common polyamide imide coating partially or completely replaces the corona-resistant polyamide imide coating 4, and a series of corona-resistant enameled wires with different corona times can be prepared to meet the use requirements of different users. Although the production cost of this embodiment is reduced, the first layer of varnish is the corona-resistant polyester imide coating 3, which has poor adhesion and is not much different from the traditional corona-resistant enameled wire. The corona resistance time of replacing a portion or all of the corona resistant polyamideimide coating 4 with a conventional polyamideimide coating is shown in table 6.
TABLE 6
As shown in Table 6, the conventional polyamideimide coating in the composite insulation layer partially or completely replaced the corona resistant polyamideimide coating 4, which has a decreased corona resistance time, but poor adhesion.
Further, in this embodiment, the second layer of lacquer, a normal polyamideimide coating, may be exchanged in the order of the lacquers of the third layer of lacquer, a corona-resistant polyamideimide coating 4 (all other conditions remaining unchanged), as shown in table 7, and a series of corona-resistant enameled wires having different corona-resistant times may be prepared as well; the two have the same corona resistant time.
TABLE 7
In a fourth embodiment, the corona-resistant enameled wire includes a metal conductor core wire, the metal conductor core wire is generally disposed on an innermost layer of the corona-resistant enameled wire, and the metal conductor core wire is generally a copper core 1, but may also be made of other metal conductors, specifically, an aluminum core, a copper-clad aluminum core, or other metal conductor core wires, which is not specifically limited herein, and as long as the metal conductor core wire is within the protection scope of the embodiment of the present invention.
Further, the outer wall of the copper core 1 is coated with a primer layer, the primer layer is a polyester imide coating 2 which is sequentially arranged on the outer wall of the copper core 1, the outer part of the primer layer is coated with a corona-resistant polyester imide coating 3, a common polyamide imide coating, a corona-resistant polyamide imide coating 4 and a self-sliding paint coating 5, wherein the polyester imide coating 2 partially or completely replaces the corona-resistant polyester imide coating 3, in a fourth specific embodiment provided by the utility model, the polyester imide coating 2 is used as a first paint for producing a corona-resistant enameled wire, the production cost is reduced by increasing the first paint coated with the polyester imide coating 2, the adhesion of the corona-resistant enameled wire is improved, but the corona-resistant performance is gradually deteriorated along with the increase of the proportion component of the thickness of the polyester imide coating 2 in the total thickness of the enameled wire composite insulating layer, through experimental research, the proportion component of the thickness of the polyester imide coating 2 in the total thickness of the enameled wire composite insulating layer is changed, can prepare corona-resistant enameled wires with low production cost and high adhesiveness. In a use scene with low corona resistance time requirement, the polyester imide coating 2 can partially or completely replace the corona resistance polyester imide coating 3 to reduce the production cost to the maximum extent and meet the use requirement of a user. Different series of corona-resistant enameled wires can be prepared by adding a common polyamideimide coating, as shown in Table 8, the thickness of the polyesterimide coating 2 accounts for the proportion of the total thickness of the composite insulating layer of the enameled wire, the corona-resistant time of the polyesterimide coating 2 which partially or completely replaces the corona-resistant polyesterimide coating 3 is increased, and the corona-resistant time of the common polyamideimide coating which fully or partially replaces the corona-resistant polyesterimide coating 3 is increased.
TABLE 8
As shown in table 8, comparative example 1 shows the thickness ratio of each layer of varnish of the conventional corona-resistant enameled wire, example 11 is that the polyester imide coating 2 is set to 22mm, the corona-resistant polyester imide coating 3 is set to 21mm, the common polyamide imide coating is 21mm, the corona-resistant polyamide imide coating 4 is 24.4mm, the self-slip varnish coating 5 is 3mm, and the thickness of the polyester imide coating 2 accounts for 24.4% of the total thickness of the composite insulating layer. In example 12, the polyester imide coating 2 was set to 43mm, the corona resistant polyester imide coating 3 was set to 0mm, the general polyamide imide coating was 44mm, the corona resistant polyamide imide coating 4 was 0mm, and the corona resistant time was 0.4 mm.
As shown in the above embodiments, in order to meet the necessary requirements of users, corona-resistant enameled wires with different proportions are prepared, but the production process of the corona-resistant enameled wire prepared by the method is complicated and tedious, and the production cost can be reduced to the greatest extent.
In the above embodiment provided by the utility model, the insulating varnish of the polyesterimide coating 2 is used as the first-pass varnish for producing the corona-resistant enameled wire, and as the content of the insulating varnish increases, the adhesiveness of the corona-resistant enameled wire gradually increases, the production cost gradually decreases, but the corona-resistant performance gradually deteriorates; by using a variable control method and controlling the proportion of the insulating paint of the polyester imide coating 2 in the thickness of a paint film, research shows that when 10 percent of the polyester imide coating 2 is introduced, the comprehensive performance reaches the optimum. Under the condition, the production cost of the modified corona-resistant enameled wire is reduced by about 14.65%, the adhesion of a paint film is improved by about 10.40%, and the corona-resistant performance is slightly reduced, but the use requirement of a user is still met.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. A corona-resistant enameled wire is characterized by comprising a metal conductor core wire, wherein a composite insulating layer is coated on the outer wall of the metal conductor core wire, and the composite insulating layer comprises a polyester imide coating, a corona-resistant polyamide imide coating and a self-lubricating paint coating which are sequentially arranged from inside to outside.
2. The corona-resistant enameled wire according to claim 1, wherein the thickness of the polyesterimide coating is not less than 5 mm.
3. The corona-resistant enameled wire according to claim 1, wherein the ratio of the thickness of the polyesterimide coating layer to the total thickness of the composite insulation layer is 10%.
4. A corona-resistant enameled wire is characterized by comprising a metal conductor core wire, wherein a composite insulating layer is coated on the outer wall of the metal conductor core wire, and the composite insulating layer comprises a polyester imide coating, a corona-resistant polyamide imide coating and a self-lubricating paint coating which are sequentially arranged from inside to outside.
5. The corona-resistant enameled wire according to claim 4, wherein the ratio of the thickness of the polyester imide coating layer to the total thickness of the composite insulating layer is 24% -50%.
6. A corona-resistant enameled wire is characterized by comprising a metal conductor core wire, wherein a composite insulating layer is coated on the outer wall of the metal conductor core wire, and comprises a polyester imide coating, a corona-resistant polyester imide coating, a polyamide imide coating, a corona-resistant polyamide imide coating and a self-lubricating paint coating which are sequentially arranged from inside to outside.
7. Corona-resistant enameled wire according to claim 6, characterized in that the thickness of the polyesterimide coating is not less than 22 mm.
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