Power cable for frequency converter and manufacturing method thereof

Abstract

The invention is applicable to the technical field of cable manufacturing, and particularly relates to a power cable for a frequency converter and a manufacturing method thereof, and the manufacturing method comprises the steps: obtaining large cell insulating layer information and small cell insulating layer information based on the working power matching of the frequency converter; the control device controls the extrusion device to extrude a large battery cell insulating layer based on the large battery cell insulating layer information and controls the extrusion device to extrude a small battery cell insulating layer based on the small battery cell insulating layer information; acquiring large wire core information and small wire core information; and performing analysis according to the large wire core information and the small wire core information to obtain cable structure information. According to the method, the size and shape factors of the large wire cores and the small wire cores can be accurately considered, and the cable structure is scientifically and reasonably designed, so that the large wire cores and the small wire cores are more reasonably distributed in the cable, and the requirements of a frequency converter system on high performance and high reliability of the cable are met.

Description

Technical Field

[0001] This application belongs to the technical field of cable manufacturing, and particularly relates to a power cable for a frequency converter and a manufacturing method thereof. Background Art

[0002] With the rapid development of industrial automation and power electronics technology, frequency converters are widely used in various fields. By changing the output power frequency, they can achieve speed control of equipment such as motors, effectively improving energy utilization efficiency and equipment operation performance. As a key component connecting the frequency converter and load equipment such as motors, the structure and performance of the power cable for a frequency converter directly affect the stability and reliability of power transmission.

[0003] In terms of cable structure design, for the common structure of 3+3 core cables, the distribution of large cores and small cores has an important impact on the electrical performance, mechanical stability, and electromagnetic compatibility of the cable. In the prior art, most cable structure designs are based on experience or simple geometric layouts. If the cable structure changes or the design is unreasonable, problems such as local overheating, mechanical stress concentration, and severe electromagnetic interference may occur during actual use of the cable, failing to meet the high-performance and high-reliability requirements of the frequency converter system for the cable. Summary of the Invention

[0004] The embodiments of this application provide a power cable for a frequency converter and a manufacturing method thereof, which can solve the problems of cable structure changes or unreasonable designs and meet the high-performance and high-reliability requirements of the frequency converter system for the cable.

[0005] In a first aspect, the embodiments of this application provide a manufacturing method for a power cable for a frequency converter, including:

[0006] Obtaining large-core insulation layer information and small-core insulation layer information based on the working power matching of the frequency converter; wherein, the working power of the frequency converter is used to reflect the working voltage and working current during the operation of the frequency converter, the large-core insulation layer information is used to reflect the thickness of the insulation layer wrapped on the surface of the large core, and the small-core insulation layer information is used to reflect the thickness of the insulation layer wrapped on the surface of the small core;

[0007] The control device controls the extrusion device to extrude the large-core insulation layer based on the large-core insulation layer information, and controls the extrusion device to extrude the small-core insulation layer based on the small-core insulation layer information;

[0008] Obtaining large-core information and small-core information; wherein, the large-core information is used to reflect the cross-sectional shape of the large core formed after the large-core insulation layer wraps the large core, and the small-core information is used to reflect the cross-sectional shape of the small core formed after the small-core insulation layer wraps the small core;

[0009] Analyze based on the large core information and the small core information to obtain cable structure information; wherein, the cable structure information is used to reflect the distribution of the large core and the small core.

[0010] The above technical solution in the embodiments of the present application has at least the following technical effects:

[0011] The method for manufacturing a power cable for a frequency converter provided by the present application obtains large core insulation layer information for reflecting the thickness of the insulation layer wrapped on the surface of the large core and small core insulation layer information for reflecting the thickness of the insulation layer wrapped on the surface of the small core by matching the operating power of the frequency converter used to reflect the operating voltage and operating current when the frequency converter works, making the determination of the insulation layer thickness more in line with the actual working conditions; then, the control device controls the extrusion device to extrude the large core insulation layer based on the large core insulation layer information, and controls the extrusion device to extrude the small core insulation layer based on the small core insulation layer information; furthermore, obtain large core information for reflecting the cross-sectional shape of the large core formed after the large core insulation layer wraps the large core and small core information for reflecting the cross-sectional shape of the small core formed after the small core insulation layer wraps the small core, and analyze to obtain cable structure information according to the large core information and the small core information. Compared with the cable structure design based on experience or simple geometric layout in the prior art, this method can accurately consider the size and shape factors of the large and small cores, and scientifically and reasonably design the cable structure. It makes the distribution of the large core and the small core in the cable more reasonable, effectively improves the stress condition of the cable during operation, reduces the mechanical stress concentration problem, optimizes the electromagnetic coupling effect and reduces electromagnetic interference; at the same time, it also helps to improve the heat dissipation performance of the cable, avoid local overheating phenomenon, thereby comprehensively improving the electrical performance, mechanical stability and electromagnetic compatibility of the cable, and meeting the requirements of the frequency converter system for high performance and high reliability of the cable.

[0012] In a possible implementation manner of the first aspect, the analyzing according to the large core information and the small core information to obtain cable structure information includes:

[0013] Analyze according to the large core information to obtain minimum circumscribed circle information; wherein, the minimum circumscribed circle information is used to reflect the circumscribed circle formed by pairwise adjacency among the three large cores;

[0014] Analyze according to the minimum circumscribed circle information and the small core information to obtain cable structure information.

[0015] In a possible implementation manner of the first aspect, the analyzing according to the minimum circumscribed circle information and the small core information to obtain cable structure information includes:

[0016] Analyze according to the minimum circumscribed circle information to obtain the maximum straight distance; wherein, the maximum straight distance is used to indicate the maximum diameter that can accommodate the small wire cores within the minimum circumscribed circle when the three large wire cores are adjacent to each other in pairs.

[0017] Compare the maximum straight distance with the small wire core information. If the maximum straight distance is greater than or equal to the diameter corresponding to the small wire core information, the cable structure information is that the three large wire cores are adjacent to each other in pairs, and the three small wire cores are tangentially distributed with two adjacent large wire cores respectively.

[0018] In a possible implementation manner of the first aspect, the analyzing according to the minimum circumscribed circle information to obtain the maximum straight distance includes:

[0019] Analyze according to the minimum circumscribed circle information to obtain an inscribed triangle; wherein, the inscribed triangle refers to an equilateral triangle inscribed in the circle corresponding to the minimum circumscribed circle information.

[0020] Analyze according to the inscribed triangle and the minimum circumscribed circle information to obtain the maximum straight distance.

[0021] In a possible implementation manner of the first aspect, the analyzing according to the inscribed triangle and the minimum circumscribed circle information to obtain the maximum straight distance includes:

[0022] Calculate the shortest line segment from the midpoint of any side of the inscribed triangle to the circle corresponding to the minimum circumscribed circle information.

[0023] Match the corresponding geometric factor according to the minimum circumscribed circle information.

[0024] Determine the maximum straight distance based on the shortest line segment and the geometric factor.

[0025] In a possible implementation manner of the first aspect, the analyzing according to the minimum circumscribed circle information and the small wire core information to obtain the cable structure information further includes:

[0026] If the maximum straight distance is less than the diameter corresponding to the small wire core information, calculate the difference between the maximum straight distance and the diameter corresponding to the small wire core information to obtain the design difference.

[0027] Obtain the large circle radius according to the large wire core information; wherein, the large circle radius is used to indicate the radius of the large wire core.

[0028] Analyze according to the design difference and the large circle radius to obtain the cable structure information.

[0029] In a possible implementation of the first aspect, analyzing according to the design difference and the large circle radius to obtain cable structure information includes:

[0030] Analyzing according to the design difference to obtain an extended length;

[0031] Calculating a center distance based on the extended length and the large circle radius;

[0032] Obtaining cable structure information based on the center distance.

[0033] In a possible implementation of the first aspect, obtaining the cable structure information based on the center distance includes:

[0034] Constructing an equidistant figure based on the center distance; wherein, the equidistant figure is an equilateral triangle constructed with the center distance as the side length;

[0035] Using the three angles of the equidistant figure as the centers of the three large wire cores to determine the position distribution of the three large wire cores;

[0036] Respectively setting the three small wire core information to be tangent to two of the large wire core figures corresponding to the position distribution of the large wire cores to obtain cable structure information.

[0037] In a second aspect, an embodiment of the present application provides a power cable manufacturing system for an inverter, including:

[0038] A matching module for obtaining large core insulation layer information and small core insulation layer information based on the operating power of the inverter; wherein, the operating power of the inverter is used to reflect the operating voltage and operating current when the inverter operates, the large core insulation layer information is used to reflect the thickness of the insulation layer wrapped on the surface of the large core, and the small core insulation layer information is used to reflect the thickness of the insulation layer wrapped on the surface of the small core;

[0039] A control module for controlling the device to control the extrusion device to extrude a large core insulation layer based on the large core insulation layer information and control the extrusion device to extrude a small core insulation layer based on the small core insulation layer information;

[0040] An acquisition module for acquiring large wire core information and small wire core information; wherein, the large wire core information is used to reflect the cross-sectional shape of the large wire core formed after the large core insulation layer wraps the large core, and the small wire core information is used to reflect the cross-sectional shape of the small wire core formed after the small core insulation layer wraps the small core;

[0041] An analysis module for analyzing according to the large wire core information and the small wire core information to obtain cable structure information; wherein, the cable structure information is used to reflect the distribution of the large wire core and the small wire core.

[0042] In a third aspect, an embodiment of the present application provides a manufacturing device for a power cable for a frequency converter, including an extrusion device, a filling device, and a control device. The control device is electrically connected to the extrusion device and the filling device. The control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method described in any one of the above first aspects is implemented.

[0043] In a fourth aspect, an embodiment of the present application provides a power cable for a frequency converter, which is manufactured by the manufacturing device for a power cable for a frequency converter described in the third aspect.

[0044] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the method described in any one of the above first aspects is implemented.

[0045] In a sixth aspect, an embodiment of the present application provides a computer program product. When the computer program product runs on a manufacturing device for a power cable for a frequency converter, the manufacturing device for a power cable for a frequency converter is caused to execute the method for manufacturing a power cable for a frequency converter described in any one of the above first aspects.

[0046] It can be understood that the beneficial effects of the above second aspect to sixth aspect can be referred to the relevant descriptions in the above first aspect, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 It is a schematic flowchart of the method for manufacturing a power cable for a frequency converter provided by an embodiment of the present application;

[0049] Figure 2 It is a schematic implementation flowchart of the method for manufacturing a power cable for a frequency converter provided by an embodiment of the present application;

[0050] Figure 3 It is a schematic structural diagram of the manufacturing system for a power cable for a frequency converter provided by an embodiment of the present application;

[0051] Figure 4 It is a schematic structural diagram of the control device of the manufacturing device for a power cable for a frequency converter provided by an embodiment of the present application. Detailed implementation manners

[0052] In the following description, specific details such as specific system architectures, technologies, etc. are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0053] It should be understood that when used in the specification of the present application and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0054] It should also be understood that the term "and / or" used in the specification of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0055] As used in the specification of the present application and the appended claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" depending on the context. Similarly, the phrase "if it is determined" or "if the described condition or event is detected" can be interpreted as meaning "once it is determined", "in response to determining", "once the described condition or event is detected", or "in response to detecting the described condition or event" depending on the context.

[0056] In addition, in the description of the specification of the present application and the appended claims, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0057] The reference to "one embodiment" or "some embodiments" etc. described in the specification of the present application means that a specific feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprising", "including", "having", and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0058] In terms of cable structure design, for the common structure form of 3+3 core cables, the distribution of large cores and small cores has an important impact on the electrical performance, mechanical stability, and electromagnetic compatibility of the cable. In the prior art, most cable structure designs are based on experience or simple geometric layouts, lacking precise analysis and optimization of the cross-sectional shapes, sizes, and mutual positional relationships of large cores and small cores. For example, when determining the distribution of large and small cores, the stress conditions, electromagnetic coupling effects, and heat dissipation requirements of different cores during cable operation are not fully considered, resulting in problems such as local overheating, mechanical stress concentration, and severe electromagnetic interference in actual cable use, and unable to meet the high-performance and high-reliability requirements of the frequency converter system for the cable.

[0059] To solve the above problems, the embodiments of the present application provide a power cable for a frequency converter and a manufacturing method thereof. In this method, by matching the operating power of the frequency converter, which reflects the operating voltage and operating current when the frequency converter works, to obtain the large-core insulation layer information reflecting the thickness of the insulation layer wrapped around the large core and the small-core insulation layer information reflecting the thickness of the insulation layer wrapped around the small core, the determination of the insulation layer thickness is more in line with the actual working conditions. Then, the control device controls the extrusion device to extrude the large-core insulation layer based on the large-core insulation layer information and controls the extrusion device to extrude the small-core insulation layer based on the small-core insulation layer information. Furthermore, by obtaining the large-core wire information reflecting the cross-sectional shape of the large wire core formed after the large-core insulation layer wraps around the large core and the small-core wire information reflecting the cross-sectional shape of the small wire core formed after the small-core insulation layer wraps around the small core, and analyzing the cable structure information based on the large-core wire information and the small-core wire information, compared with the cable structure design based on experience or simple geometric layout in the prior art, this method can precisely consider the size and shape factors of large and small wire cores and scientifically and reasonably design the cable structure. This makes the distribution of large and small wire cores in the cable more reasonable, effectively improves the stress conditions during cable operation, reduces the mechanical stress concentration problem, optimizes the electromagnetic coupling effect, and reduces electromagnetic interference. At the same time, it also helps to improve the heat dissipation performance of the cable, avoid local overheating, and thus comprehensively improve the electrical performance, mechanical stability, and electromagnetic compatibility of the cable, meeting the high-performance and high-reliability requirements of the frequency converter system for the cable.

[0060] The manufacturing method of the power cable for a frequency converter provided by the embodiments of the present application can be applied to the manufacturing equipment of the power cable for a frequency converter. At this time, the manufacturing equipment of the power cable for a frequency converter is the execution subject of the manufacturing method of the power cable for a frequency converter provided by the embodiments of the present application, and the embodiments of the present application do not impose any restrictions on the specific type of the manufacturing equipment of the power cable for a frequency converter.

[0061] For example, the manufacturing equipment for power cables used in frequency converters may include an extrusion device, a filling device, and a control device. The control device is electrically connected to the extrusion device and the filling device. The extrusion device is used to heat the insulating material to a molten state and, according to the set process parameters, uniformly extrude the molten insulating material and coat it on the core to form a wire core. The extrusion device mainly consists of a barrel, a screw, a heating system, and a die. The barrel is used to hold the insulating material; the screw rotates driven by a motor, pushing the insulating material forward while stirring and plasticizing the material; the heating system surrounds the outside of the barrel and can precisely control the temperature of different sections to make the insulating material reach a suitable molten state; the die determines the shape and thickness of the extruded insulating layer, and by replacing dies of different specifications, cable insulating layers that meet different requirements can be produced. The filling device is used to fill suitable materials, such as soft materials like polypropylene ropes, rock wool, and rubber, into the gaps between the cores during the cable laying process. The filling device consists of a storage bin, a conveying pipeline, a metering pump, and a filling head. The storage bin is used to store the filling material; the conveying pipeline transports the filling material from the storage bin to the filling head; the metering pump can control the conveying volume of the filling material according to the cable structure to ensure uniform filling; the filling head accurately fills the material into the gaps between the cable cores, making the structure of the cable more stable and round. The control device comprehensively monitors and precisely controls the entire cable manufacturing process.

[0062] For example, the control device can be a mobile phone, a tablet computer, a wearable device, an augmented reality (AR) / virtual reality (VR) device, a laptop computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), a desktop computer, a smart large screen, a smart TV, and other terminal devices, a handheld device with wireless communication functions, a computing device, or other processing devices connected to a wireless modem, an Internet of Things terminal, a computer, a laptop computer, a handheld communication device, a handheld computing device, a satellite wireless device, a wireless modem card, a television set-top box (STB), a customer premise equipment (CPE), and / or other devices used for communication on a wireless system, as well as next-generation communication systems, such as mobile terminals in a 5G network or mobile terminals in a future evolved Public Land Mobile Network (PLMN).

[0063] To better understand the manufacturing method of the power cable for frequency converters provided in the embodiments of the present application, the following provides an exemplary introduction to the specific implementation process of the manufacturing method of the power cable for frequency converters provided in the embodiments of the present application.

[0064] Figure 1 The schematic flowchart of the manufacturing method of the power cable for frequency converters provided in the embodiments of the present application is shown. The manufacturing method of the power cable for frequency converters includes:

[0065] S100, obtaining the large cell insulation layer information and the small cell insulation layer information based on the matching of the operating power of the frequency converter; wherein, the operating power of the frequency converter is used to reflect the operating voltage and operating current when the frequency converter operates, the large cell insulation layer information is used to reflect the thickness of the insulation layer wrapped on the surface of the large cell, and the small cell insulation layer information is used to reflect the thickness of the insulation layer wrapped on the surface of the small cell.

[0066] It can be understood that the voltage and current magnitudes when the frequency converter operates will affect the cable's ability to transmit power and heat generation, etc., and the large and small cells undertake different power transmission tasks in the cable. The large cell usually bears the main power, and the small cell plays an auxiliary or specific function. Determining the insulation layer thickness according to the operating power of the frequency converter can enable the insulation layer to adapt to the heat generation, mechanical stress, etc. of different cells while ensuring electrical insulation performance. For example, for a frequency converter operating at high power, the large cell has a large current passing through it and generates more heat, so a thicker insulation layer is required to ensure insulation performance and heat dissipation performance, and the small cell also determines an appropriate insulation layer thickness according to its function and power distribution.

[0067] There is a corresponding large cell insulation layer information and a corresponding small cell insulation layer information for different operating powers of the frequency converter. Exemplarily, the operating power of the frequency converter can be matched in the frequency converter database to obtain the corresponding large cell insulation layer information and small cell insulation layer information; or the operating power of the frequency converter can be input into the learning model, and the learning model outputs the corresponding large cell insulation layer information and small cell insulation layer information, etc., but not limited to this. The frequency converter database refers to a database that contains different specifications of frequency converters, the operating power of the frequency converter, and the corresponding large cell insulation layer information and small cell insulation layer information. These data can be obtained through means such as laboratory experiments, on-site measurements and monitoring, and past experience, etc. After obtaining the data, the collected data is sorted, classified, and archived, useful information and rules are extracted, and then the relevant data is saved to the database to form a raw material database. The learning model is trained with multiple sets of training data, and each set of training data in the multiple sets of training data includes the operating power of the frequency converter and the corresponding large cell insulation layer information and small cell insulation layer information.

[0068] S200, the control device controls the extrusion device to extrude the large cell insulation layer based on the large cell insulation layer information and controls the extrusion device to extrude the small cell insulation layer based on the small cell insulation layer information.

[0069] It can be understood that the extrusion device extrudes the insulating material evenly according to the thickness requirements of the large cell insulation layer information and wraps it around the surface of the large cell at set parameters such as temperature, pressure, and extrusion speed to obtain a large wire core; the insulating material is extruded evenly according to the thickness requirements of the small cell insulation layer information and wrapped around the surface of the small cell to obtain a small wire core.

[0070] S300, obtain the large wire core information and the small wire core information; wherein, the large wire core information is used to reflect the cross-sectional shape of the large wire core formed after the large cell insulation layer wraps the large cell, and the small wire core information is used to reflect the cross-sectional shape of the small wire core formed after the small cell insulation layer wraps the small cell.

[0071] It can be understood that the large wire core information refers to the actual cross-sectional area size of the insulating material and the large cell as a whole obtained after cooling and shaping the insulating material wrapped around the surface of the large cell, and the small wire core information refers to the actual cross-sectional area size of the insulating material and the small cell as a whole obtained after cooling and shaping the insulating material wrapped around the surface of the small cell.

[0072] S400, analyze based on the large wire core information and the small wire core information to obtain the cable structure information; wherein, the cable structure information is used to reflect the distribution of the large wire core and the small wire core.

[0073] It can be understood that the distribution of the large and small wire cores is directly related to the electrical performance, mechanical performance, heat dissipation performance, etc. of the cable. By analyzing the cross-sectional shape information of the large and small wire cores, their relative positions and arrangement methods inside the cable can be determined through geometric analysis calculations and electromagnetic principles to obtain the cable structure information; or the large wire core information and the small wire core information can be input into a learning model, and the learning model outputs the corresponding cable structure information, etc., but not limited to this.

[0074] With such a setting, the cable structure information can be scientifically and reasonably determined through the large wire core information and the small wire core information, meeting the performance requirements of the cable in different application scenarios and reducing performance problems and failure risks caused by unreasonable cable structures.

[0075] In a possible implementation manner, in step S400, analyzing based on the large wire core information and the small wire core information to obtain the cable structure information includes:

[0076] S410, analyze based on the large wire core information to obtain the minimum circumscribed circle information; wherein, the minimum circumscribed circle information is used to reflect the circumscribed circle formed by pairwise adjacency between three large wire cores.

[0077] It can be understood that when the three large cores are adjacent to each other in pairs, there is a smallest circumscribed circle that can completely contain them. By analyzing the cross-sectional graphic information of the large cores, the information such as the radius and the center position of this smallest circumscribed circle can be determined using geometric algorithms, which is the smallest circumscribed circle information.

[0078] S420. Analyze based on the smallest circumscribed circle information and the small core information to obtain the cable structure information.

[0079] It can be understood that the smallest circumscribed circle information determines the space range occupied by the large cores, and the small cores need to be reasonably distributed in the remaining space. Combining the cross-sectional graphic information of the small cores, the optimal distribution positions of the small cores around the large cores can be further analyzed. Exemplarily, the cable structure information can be obtained by analyzing the distribution in the remaining space in the smallest circumscribed circle information and combining the sizes of the small cores; or the smallest circumscribed circle information and the small core information can be input into a learning model, and the learning model outputs the corresponding cable structure information, and so on, but not limited to this.

[0080] With such a setting, by combining the smallest circumscribed circle information and the small core information to determine the cable structure, the spatial relationship and performance requirements of the large and small cores are fully considered, improving the scientificity and rationality of the cable structure design, and helping to enhance the overall performance and reliability of the cable.

[0081] In a possible implementation manner, in step S420, analyze based on the smallest circumscribed circle information and the small core information to obtain the cable structure information, including:

[0082] S421. Analyze based on the smallest circumscribed circle information to obtain the maximum straight distance; wherein, the maximum straight distance is used to indicate the maximum diameter that can accommodate the small cores within the smallest circumscribed circle when the three large cores are adjacent to each other in pairs.

[0083] It can be understood that after determining the smallest circumscribed circle, the maximum diameter that can accommodate the small cores within this circle, that is, the maximum straight distance, is found through geometric analysis. Exemplarily, the geometric shape of the smallest circumscribed circle can be analyzed, the geometric structure of the inscribed equilateral triangle can be calculated, and then the maximum straight distance can be determined according to the size of the inscribed triangle; or the radius of the largest circle that can be accommodated can be analyzed based on the area and shape of the remaining space in the smallest circumscribed circle, and this radius can be determined as the maximum straight distance, and so on, but not limited to this.

[0084] In a possible implementation manner, in step S420, analyze based on the smallest circumscribed circle information to obtain the maximum straight distance, including:

[0085] S4211. Analyze based on the smallest circumscribed circle information to obtain the inscribed triangle; wherein, the inscribed triangle refers to an equilateral triangle inscribed in the circle corresponding to the smallest circumscribed circle information.

[0086] It can be understood that an inscribed triangle can be drawn or constructed through geometric drawing software based on the minimum circumscribed circle information; or the parameters of the minimum circumscribed circle (radius, diameter, arc length, etc.) can be calculated through mathematical calculation software to obtain the inscribed triangle, etc., but not limited to this.

[0087] S4212. Analyze based on the inscribed triangle and the minimum circumscribed circle information to obtain the maximum straight distance.

[0088] It can be understood that the maximum straight distance is used to reflect the maximum circle that can be accommodated in the other areas within the minimum circumscribed circle except for the area occupied by the large wire core pattern. Exemplarily, the maximum straight distance can be obtained by combining the geometric characteristics of the inscribed triangle and the parameters of the minimum circumscribed circle through specific geometric calculation methods; or by inputting the inscribed triangle and the minimum circumscribed circle information into a learning model, and the learning model outputs the corresponding maximum straight distance, etc., but not limited to this.

[0089] With such a setting, the maximum straight distance is calculated by constructing an inscribed triangle and combining the minimum circumscribed circle information, using a simple and effective geometric method, which improves the accuracy and efficiency of determining the maximum straight distance, provides an accurate data basis for reasonably planning the internal wire core distribution of the cable, and helps to optimize the cable structure design.

[0090] In a possible implementation manner, in step S4212, analyzing based on the inscribed triangle and the minimum circumscribed circle information to obtain the maximum straight distance includes:

[0091] S42121. Calculate the shortest line segment between the midpoint of any side line of the inscribed triangle and the circle corresponding to the minimum circumscribed circle information.

[0092] It can be understood that through geometric calculation methods, such as using the Pythagorean theorem, trigonometric functions, etc., and combining the known parameters of the inscribed triangle and the minimum circumscribed circle, the length of the shortest line segment between the midpoint of any side line of the inscribed triangle and the circle corresponding to the minimum circumscribed circle information can be accurately calculated.

[0093] S42122. Match the corresponding geometric factor according to the minimum circumscribed circle information.

[0094] It can be understood that it is the influence coefficient of the geometric characteristics of the minimum circumscribed circle itself on the calculation of the maximum straight distance. It is summarized through a large number of mathematical derivations and geometric analyses for minimum circumscribed circles of different sizes and characteristics. For minimum circumscribed circles with different parameters such as radius and center position, the corresponding geometric factors are different. For example, when the radius of the minimum circumscribed circle increases, the geometric factor will also change according to a specific mathematical law. This factor is a dimensionless value that comprehensively considers factors such as the shape and size of the minimum circumscribed circle and plays a role in correcting and calibrating when calculating the maximum straight distance, making the calculation result more accurately reflect the actual maximum diameter that can accommodate small wire cores.

[0095] S42123, determine the maximum straight distance based on the shortest line segment and the geometric factor.

[0096] It can be understood that the maximum straight distance = the length value reflected by the shortest line segment × the geometric factor.

[0097] With such a setting, operations are carried out in combination with specific geometric factors to determine the maximum straight distance, providing an accurate data basis for judging whether small wire cores can be reasonably distributed within the space formed by large wire cores. This calculation method is logically clear, scientific and rigorous, and can effectively improve the accuracy and reliability of cable structure design. During the actual cable manufacturing process, based on accurate maximum straight distance data, the layout of large and small wire cores can be reasonably planned, avoiding problems of reduced cable performance caused by unreasonable wire core distribution, thereby improving the quality and performance of cable products and meeting the performance requirements of cables in different application scenarios.

[0098] S422a, compare the maximum straight distance with the small wire core information. If the maximum straight distance is greater than or equal to the diameter corresponding to the small wire core information, the cable structure information is that the three large wire cores are adjacent to each other in pairs, and the three small wire cores are tangent to two adjacent large wire cores respectively.

[0099] It can be understood that when the maximum straight distance is greater than or equal to the small wire core diameter, it means that the small wire cores can be distributed in a tangent manner within the gaps formed by the large wire cores. This distribution method can ensure sufficient electrical distance between the wire cores while making the cable structure more compact, which is beneficial to improving the mechanical strength and electrical performance of the cable. For example, in terms of electrical performance, the tangent distribution can reduce electromagnetic interference between the wire cores; in terms of mechanical performance, the compact structure can enhance the overall stability of the cable, facilitating the installation and use of the cable. Through this method of comparison and determination of the distribution method, the cable structure can be quickly and reasonably determined, improving the efficiency and quality of cable design.

[0100] In a possible implementation manner, in step S420, when analyzing according to the minimum circumscribed circle information and the small wire core information to obtain the cable structure information, it further includes:

[0101] S422b, if the maximum straight distance is less than the diameter corresponding to the small core information, calculate the difference between the maximum straight distance and the diameter corresponding to the small core information to obtain the design difference.

[0102] It can be understood that the design difference = the diameter corresponding to the small core information - the maximum straight distance.

[0103] S423, obtain the large circle radius according to the large core information; where the large circle radius is used to indicate the radius of the large core.

[0104] It can be understood that the large circle radius refers to the sum value of the radius of the large core plus the thickness of the insulating layer of the large core.

[0105] S424, analyze according to the design difference and the large circle radius to obtain the cable structure information.

[0106] Exemplarily, the position between the large cores can be adjusted by the design difference, and then the position of the small cores can be adjusted in combination with the large circle radius to obtain the cable structure information; or the design difference and the large circle radius can be input into the learning model, and the learning model outputs the corresponding cable structure information, etc., but not limited to this.

[0107] With such a setting, by comprehensively considering the design difference, the large core radius and the small core radius to determine the cable structure, it is possible to flexibly adjust the core layout when the maximum straight distance is less than the small core diameter, ensure the rationality and performance reliability of the cable structure, improve the adaptability and flexibility of the cable structure design, and meet the cable design requirements under different core size conditions.

[0108] In a possible implementation manner, in step S424, analyze according to the design difference and the large circle radius to obtain the cable structure information, including:

[0109] S4241, analyze according to the design difference to obtain the extended length.

[0110] It can be understood that the extended length refers to the additional distance required between the large cores. Different design differences correspond to an extended length, and the corresponding extended length can be obtained by matching the design difference in the frequency converter database; or the design difference can be input into the learning model, and the learning model outputs the corresponding extended length, etc., but not limited to this.

[0111] S4242, calculate the center distance based on the extended length and the large circle radius.

[0112] It can be understood that the center distance = 2 × the large circle radius + the extended length.

[0113] S4243, obtain the cable structure information based on the center distance.

[0114] It can be understood that after the center distance is determined, it can be used as a basis to determine the specific distribution positions of the large and small cores, so as to obtain the cable structure information. The center distance can be confirmed as the distance between the centers of the large cores. Through this distance, the relative position relationship of the three large cores can be obtained, and then the positions of the small cores can be determined to obtain the cable structure information; or the distance between the large cores can be analyzed and determined according to the center distance, so that the layout of the large cores can be obtained, and then the position relationship between the small cores and the large cores can be clarified to obtain the cable structure information.

[0115] With such a setting, by calculating the extended length, determining the center distance, and finally obtaining the cable structure information, a systematic calculation and analysis method is adopted, which can accurately determine the cable structure under complex core size conditions, improve the accuracy and reliability of cable structure design, meet the strict requirements of the cable in terms of electrical and mechanical properties, and enhance the overall quality of the cable.

[0116] In a possible implementation manner, in step S4243, obtaining the cable structure information based on the center distance includes:

[0117] S42431, constructing an equidistant graph based on the center distance; where the equidistant graph is an equilateral triangle constructed with the center distance as the side length.

[0118] It can be understood that constructing an equilateral triangle with the center distance as the side length is an intuitive and effective method to determine the distribution positions of the large cores. The three vertices of this equilateral triangle are the potential center positions of the three large cores. By constructing such an equidistant graph, the abstract center distance can be transformed into a specific geometric graph, which is convenient for intuitively understanding and planning the layout of the large cores.

[0119] S42432, using the three angles of the equidistant graph as the centers of the three large cores to determine the distribution of the positions of the three large cores.

[0120] It can be understood that when the three angles of the equidistant graph are used as the centers of the three large cores, the distribution of the positions of the large cores is accurately determined. At this time, the three large cores do not contact each other, and the distance between their edges is the distance value reflected by the extended length.

[0121] S42433, respectively setting the information of the three small cores to be tangent to two large core graphs corresponding to the distribution of the positions of the large cores to obtain the cable structure information.

[0122] It can be understood that the three small core information is respectively set to be tangent to two large core graphics corresponding to the large core position distribution, which means that the edge of each small core contacts the edges of two large cores, and the edge of each large core contacts the edges of two small cores. At this time, the distribution of the large cores and small cores is the cable structure information. And at this time, the minimum circumscribed circle formed by the outside of the three small cores and the three large cores is the distribution of the shielding layer of the power cable, and the filling device sets the amount of the filling agent according to the size of this minimum circumscribed circle to make the cable structure tend to be stable and compact.

[0123] With such a setting, by constructing an equidistant graphic based on the center distance to determine the large core position distribution, and then arranging the small cores to be tangent to the large cores, a set of scientific, reasonable and efficient cable structure design methods is formed. This design method makes full use of geometric principles, makes the internal structure of the cable more orderly and compact, and improves its mechanical properties and overall reliability while ensuring the stable electrical performance of the cable.

[0124] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0125] Corresponding to the method for manufacturing a power cable for a frequency converter described in the above embodiments, an embodiment of the present application also provides a system for manufacturing a power cable for a frequency converter, and each module of the system can implement each step of the method for manufacturing a power cable for a frequency converter. Figure 3 The block diagram of the system for manufacturing a power cable for a frequency converter provided by the embodiment of the present application is shown. For the convenience of description, only the part related to the embodiment of the present application is shown.

[0126] Referring to Figure 3 , the system for manufacturing a power cable for a frequency converter includes:

[0127] A matching module, configured to match and obtain large core insulation layer information and small core insulation layer information based on the operating power of the frequency converter; wherein, the operating power of the frequency converter is used to reflect the operating voltage and operating current when the frequency converter operates, the large core insulation layer information is used to reflect the thickness of the insulation layer wrapped on the surface of the large core, and the small core insulation layer information is used to reflect the thickness of the insulation layer wrapped on the surface of the small core.

[0128] A control module, configured to control the extrusion device to extrude the large core insulation layer based on the large core insulation layer information, and control the extrusion device to extrude the small core insulation layer based on the small core insulation layer information.

[0129] An acquisition module for acquiring large core information and small core information; wherein, the large core information is used to reflect the cross-sectional shape of the large core formed after the large cell insulation layer wraps the large cell, and the small core information is used to reflect the cross-sectional shape of the small core formed after the small cell insulation layer wraps the small cell.

[0130] An analysis module for analyzing based on the large core information and the small core information to obtain cable structure information; wherein, the cable structure information is used to reflect the distribution of the large core and the small core.

[0131] It should be noted that the information interaction, execution process, etc. between the above modules, due to being based on the same concept as the method embodiment of the present application, for their specific functions and the technical effects brought, reference can be specifically made to the method embodiment part, and details will not be elaborated here.

[0132] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above division of each module is used as an example. In practical applications, the above functions can be allocated to different modules according to needs, that is, the internal structure of the system is divided into different modules to complete all or part of the functions described above. Each module in the embodiment can be integrated in a processing unit, or each module exists physically alone, or two or more modules can be integrated in a unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each module are only for the convenience of mutual distinction and do not limit the protection scope of the present application. The specific working process of the modules in the above system can refer to the corresponding process in the foregoing method embodiment, and details will not be elaborated here.

[0133] The embodiment of the present application also provides a manufacturing device for a power cable for a frequency converter, including an extrusion device, a filling device, and a control device. The control device is electrically connected to the extrusion device and the filling device. Figure 4 It is a schematic structural diagram of the control device 6 provided in an embodiment of the present application. As Figure 4 shown, the control device 6 of this embodiment includes: at least one processor 60 ( Figure 4 only one is shown herein), at least one memory 61 ( Figure 4 only one is shown herein), and a computer program 62 stored in the at least one memory 61 and executable on the at least one processor 60. When the processor 60 executes the computer program 62, the control device 6 realizes the steps in any of the above method embodiments of the manufacturing method of the power cable for a frequency converter, or the control device 6 realizes the functions of each module in the above device embodiments.

[0134] Exemplarily, the computer program 62 can be divided into one or more modules / units, which are stored in the memory 61 and executed by the processor 60 to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program 62 in the control device 6.

[0135] The control device 6 can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The power cable manufacturing device for the frequency converter may include, but is not limited to, a processor 60 and a memory 61. Those skilled in the art can understand that Figure 4 merely examples of the control device 6, which do not constitute a limitation on the control device 6, may include more or fewer components than shown in the figure, or combine some components, or different components. For example, it may also include input / output devices, network access devices, a bus, etc.

[0136] The processor 60 can be a central processing unit (CPU), and the processor 60 can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0137] In some embodiments, the memory 61 can be an internal storage unit of the control device 6, such as the hard disk or memory of the control device 6. In other embodiments, the memory 61 can also be an external storage device of the control device 6, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the control device 6. Further, the memory 61 can also include both the internal storage unit and the external storage device of the control device 6. The memory 61 is used to store an operating system, application programs, a boot loader, data, and other programs, such as the program code of the computer program. The memory 61 can also be used to temporarily store data that has been output or will be output.

[0138] The embodiment of the present application also provides a power cable for a frequency converter, and the power cable for a frequency converter is manufactured by the manufacturing equipment for the power cable for a frequency converter described above.

[0139] The embodiment of the present application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0140] The embodiment of the present application provides a computer program product. When the computer program product runs on the manufacturing equipment for the power cable for a frequency converter, the manufacturing equipment for the power cable for a frequency converter implements the steps in any of the above method embodiments.

[0141] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above method embodiments of the present application, a computer program can be used to instruct relevant hardware to complete. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps in each of the above method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can at least include: any entity or device that can carry the computer program code to the manufacturing equipment for the power cable for a frequency converter, a recording medium, a computer memory, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), an electrical carrier signal, a telecommunications signal, and a software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk, or an optical disc, etc.

[0142] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0143] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0144] In the embodiments provided in this application, it should be understood that the disclosed manufacturing equipment and system for power cables used in frequency converters can be implemented in other ways. For example, the embodiments of the manufacturing system for power cables used in frequency converters described above are merely illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the couplings, direct couplings, or communication connections shown or discussed with each other can be indirect couplings or communication connections through some interfaces, devices, or modules, and can be in electrical, mechanical, or other forms.

[0145] The modules described as separate components may or may not be physically separated. The components shown as modules may or may not be physical modules, that is, they can be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0146] The above-described embodiments are only used to illustrate the technical solutions of this application, rather than to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A manufacturing method of a power cable for a frequency converter, characterized in that, Including: Obtaining large cell insulation layer information and small cell insulation layer information based on the working power matching of the frequency converter; wherein, the working power of the frequency converter is used to reflect the working voltage and working current when the frequency converter operates, the large cell insulation layer information is used to reflect the thickness of the insulation layer wrapped on the surface of the large cell, and the small cell insulation layer information is used to reflect the thickness of the insulation layer wrapped on the surface of the small cell; The control device controls the extrusion device to extrude the large cell insulation layer based on the large cell insulation layer information, and controls the extrusion device to extrude the small cell insulation layer based on the small cell insulation layer information; Obtaining large wire core information and small wire core information; wherein, the large wire core information is used to reflect the cross-sectional shape of the large wire core formed after the large cell insulation layer wraps the large cell, and the small wire core information is used to reflect the cross-sectional shape of the small wire core formed after the small cell insulation layer wraps the small cell; Analyzing according to the large wire core information and the small wire core information to obtain cable structure information; wherein, the cable structure information is used to reflect the distribution of the large wire core and the small wire core.

2. The manufacturing method of the power cable for a frequency converter according to claim 1, characterized in that The analyzing according to the large wire core information and the small wire core information to obtain cable structure information includes: Analyzing according to the large wire core information to obtain minimum circumscribed circle information; wherein, the minimum circumscribed circle information is used to reflect the circumscribed circle formed by two adjacent ones among the three large wire cores; Analyzing according to the minimum circumscribed circle information and the small wire core information to obtain cable structure information.

3. The manufacturing method of the power cable for frequency converters according to claim 2, characterized in that, The analyzing according to the minimum circumscribed circle information and the small wire core information to obtain cable structure information includes: Analyzing according to the minimum circumscribed circle information to obtain the maximum straight distance; wherein, the maximum straight distance is used to indicate the maximum diameter that can accommodate the small wire core within the minimum circumscribed circle when two adjacent ones among the three large wire cores are adjacent; Comparing the maximum straight distance with the small wire core information, if the maximum straight distance is greater than or equal to the diameter corresponding to the small wire core information, the cable structure information is that two adjacent ones among the three large wire cores are adjacent, and the three small wire cores are respectively tangent to two adjacent large wire cores and distributed.

4. The manufacturing method of the power cable for frequency converter according to claim 3, characterized in that, The analyzing according to the minimum circumscribed circle information to obtain the maximum straight distance includes: Analyzing according to the minimum circumscribed circle information to obtain an inscribed triangle; wherein, the inscribed triangle is an equilateral triangle inscribed in the circle corresponding to the minimum circumscribed circle information; Analyzing according to the inscribed triangle and the minimum circumscribed circle information to obtain the maximum straight distance.

5. The manufacturing method of the power cable for frequency converter according to claim 4, characterized in that, The analyzing according to the inscribed triangle and the minimum circumscribed circle information to obtain the maximum straight distance includes: Calculating the shortest line segment between the midpoint of any side of the inscribed triangle and the circle corresponding to the minimum circumscribed circle information; Matching the corresponding geometric factor according to the minimum circumscribed circle information; Determining the maximum straight distance based on the shortest line segment and the geometric factor.

6. The manufacturing method of the power cable for frequency converters according to claim 3, characterized in that, The analyzing according to the minimum circumscribed circle information and the small wire core information to obtain cable structure information further includes: If the maximum straight distance is less than the diameter corresponding to the small wire core information, calculate the difference between the maximum straight distance and the diameter corresponding to the small wire core information to obtain a design difference; Obtain a large circle radius according to the large wire core information; wherein, the large circle radius is used to indicate the radius of the large wire core; Analyze according to the design difference and the large circle radius to obtain cable structure information.

7. The manufacturing method of the power cable for a frequency converter according to claim 6, characterized in that, The analyzing according to the design difference and the large circle radius to obtain cable structure information includes: Analyze according to the design difference to obtain an extended length; Calculate a center distance based on the extended length and the large circle radius; Obtain cable structure information based on the center distance.

8. The manufacturing method of the power cable for frequency converters according to claim 7, characterized in that, The obtaining cable structure information based on the center distance includes: Construct an equidistant figure based on the center distance; wherein, the equidistant figure is an equilateral triangle constructed with the center distance as the side length; Use the three angles of the equidistant figure as the centers of the three large wire cores to determine the position distribution of the large wire cores of the three large wire cores; Respectively set the three small wire core information to be tangent to two of the large wire core figures corresponding to the large wire core position distribution to obtain cable structure information.

9. A manufacturing device for a power cable used in a frequency converter, characterized in that, Including an extrusion device, a filling device and a control device, the control device is electrically connected to the extrusion device and the filling device, the control device includes a memory, a processor and a computer program stored in the memory and operable on the processor, and when the processor executes the computer program, the method according to any one of claims 1 to 8 is implemented.

10. A power cable for a frequency converter, characterized in that, The power cable for a frequency converter is manufactured by the manufacturing equipment for the power cable for a frequency converter.

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