Coil simulation preparation system and method

Abstract

The invention discloses a coil simulation preparation system and method, and relates to the field of coil simulation preparation; the system constructs a first cylinder and a second cylinder through a cylinder construction module; a conversion module converts the intersection cylinder into a curve line segment to obtain a three-dimensional coil contour; a coil model construction module sweeps from a sweep starting surface according to a set method according to the shape of the coil contour to obtain a coil model; a simulation module performs electromagnetic excitation simulation processing according to the coil model to obtain a magnetic induction intensity distribution diagram; a processing module determines whether the electromagnetic field flux density of the coil model is within a set density range according to the magnetic induction intensity distribution diagram; if so, the coil is prepared according to the coil model; if not, the "cylinder construction module" is returned to change the parameters of the first cylinder and the second cylinder until the electromagnetic field flux density of the coil model is within the set density range; the invention can efficiently and conveniently realize the simulation preparation of the coil.

Description

Technical Field

[0001] The present invention relates to the field of coil simulation preparation, and in particular to a coil simulation preparation system and method. Background Art

[0002] There are abundant natural gas hydrate (combustible ice) resources in the seabed sediments, which are formed by natural gas and water under low temperature and high pressure conditions. At present, the main methods for the exploitation of hydrates include pressure reduction method, inhibitor method, heat injection method, CO2 replacement method, etc. Among them, the pressure reduction method is the main means of hydrate exploitation because it is technically easy to implement and relatively economical. However, the development process of natural gas hydrates still has a long way to go, and there are a series of technical problems that need to be tackled and solved. For example, the reservoir around the well often experiences a drop in temperature due to the heat absorption of hydrate decomposition and the throttling effect during gas flow, which leads to the formation of secondary hydrates, blocking the gas transport channel and reducing gas production efficiency. At present, there is no mature technology in the world to solve this problem.

[0003] In order to prevent and control the secondary hydrate hazards around the well, the existing technology uses magnetic fluid enhanced electromagnetic heating technology to solve the problem. Magnetic fluid is an emulsion of magnetite nanoparticles, a new material that has both liquid fluidity and solid magnetic properties. If the magnetic fluid is injected into the reservoir around the well along with the fracturing fluid, and an alternating electromagnetic field is applied to the reservoir sediment around the well, the magnetite nanoparticles will vibrate under the action of the alternating electromagnetic field, generate heat due to friction, and realize the conversion of electrical energy into thermal energy, thereby achieving the purpose of remotely heating the local formation around the well and eliminating secondary hydrates.

[0004] The magnetic fluid enhanced electromagnetic heating technology requires winding a transmitting coil outside the casing. Its development involves factors such as wire material, thickness, length, number of turns, area, shape, number of layers and array, and the manufacturing methods vary. If the experimental method is directly adopted for development, it is necessary to continuously make coils and measure various parameters. The workload is huge and very complicated, and the efficiency is low and the cost is high. Because through the physical experimental method, it is necessary to purchase metal wires, then wind them into coils, and then use physical instruments to measure the magnetic induction intensity at fixed points. This experimental method will result in a large workload, high cost, and very low efficiency. Therefore, it is crucial to realize the simulation preparation of coils efficiently and easily. Summary of the invention

[0005] The purpose of the present invention is to provide a coil simulation preparation system and method, which can realize the simulation preparation of coils efficiently and conveniently.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A coil simulation preparation system, the system comprising:

[0008] A cylinder construction module, used to construct a first cylinder and a second cylinder; the first cylinder and the second cylinder are perpendicular and intersecting; the intersection portion of the first cylinder and the second cylinder is an intersection cylinder;

[0009] A conversion module, connected to the cylinder construction module, for converting the intersection cylinder into a curve line segment to obtain a three-dimensional coil contour;

[0010] A coil model construction module is connected to the conversion module and is used to sweep from a sweep starting plane in a set manner according to the shape of the coil contour to obtain a coil model; the sweep starting plane is a plane with a plurality of circles; the circle is obtained by drawing a circle with a set radius on the set plane with the intersection of the coil contour and the set plane as the center; the set plane is a plane constructed on a surface where the coil contour is located;

[0011] A simulation module, connected to the coil model building module, is used to perform electromagnetic excitation simulation processing according to the coil model to obtain a magnetic induction intensity distribution diagram; the magnetic induction intensity distribution diagram represents the magnetic induction intensity value corresponding to each arc length in the coil model;

[0012] A processing module is connected to the simulation module and is used to determine whether the electromagnetic field flux density of the coil model is within a set density range based on the magnetic induction intensity distribution diagram; if so, the coil is prepared according to the coil model; if not, the module returns to the "cylinder construction module" to change the parameters of the first cylinder and the second cylinder until the electromagnetic field flux density of the coil model is within the set density range; the parameters include: radius and height.

[0013] Optionally, the conversion module includes: an interception submodule, a conversion submodule and an output submodule;

[0014] The interception submodule is connected to the column construction module; the conversion submodule is connected to the interception submodule; the output submodule is connected to the conversion submodule;

[0015] The interception submodule is used to intercept the intersection of the first cylinder and the second cylinder to obtain the intersection cylinder;

[0016] The conversion submodule is used to convert the intersection cylinder into a curve line segment;

[0017] The output submodule is used to output the curve line segment to obtain the coil contour.

[0018] Optionally, the coil model construction module includes: a plane construction submodule, a processing submodule, a sweep start surface determination submodule and a coil model determination submodule;

[0019] The processing submodule is connected to the plane construction submodule and the conversion module respectively; the sweep start surface determination submodule is connected to the processing submodule; the coil model determination submodule is connected to the sweep start surface determination submodule;

[0020] The plane construction submodule is used to determine a set plane; the set plane is a plane constructed on a surface where the coil outline is located;

[0021] The processing module is used to determine a plurality of intersection points according to the coil contour and the set plane, and to draw a circle with a set radius on the set plane with the intersection points as the center to obtain a plurality of circles;

[0022] The sweep start surface determination submodule is used to determine a plane with a plurality of the circles as the sweep start surface;

[0023] The coil model determination submodule is used to:

[0024] Sweeping the first part of the coil contour along one end of the sweep starting surface toward the other end of the sweep starting surface, and stopping the sweeping when the number of sweeps reaches a first set value, thereby obtaining a first sweeping structure;

[0025] Sweeping the second partial structure of the coil outline along one end of the sweep starting surface toward the other end of the sweep starting surface, and stopping the sweeping when the number of sweeps reaches a second set value, to obtain a second sweeping structure; the second partial structure is the remaining partial structure of the coil outline minus the first partial structure;

[0026] The coil model is determined according to the first sweep structure and the second sweep structure; the wire diameter of the coil in the coil model is the value of the set radius.

[0027] Optionally, the simulation module includes: an input submodule and a calculation submodule;

[0028] The input submodule is connected to the coil model building module; the calculation submodule is connected to the input submodule;

[0029] The input submodule is used to input voltage or current to the coil model;

[0030] The calculation submodule is used to calculate the magnetic induction intensity corresponding to each arc length on the coil model according to the voltage or current, and obtain the magnetic induction intensity distribution diagram according to each magnetic induction intensity.

[0031] Optionally, the material of the coil model is copper.

[0032] A coil simulation preparation method, the method is applied to any one of the coil simulation preparation systems described above, the method comprising:

[0033] According to the first radius and the first height, a first cylinder is constructed; according to the second radius and the second height, a second cylinder is constructed; the first cylinder and the second cylinder are perpendicular and intersecting; the intersection of the first cylinder and the second cylinder is an intersection cylinder;

[0034] Performing curve segment conversion on the intersection cylinder to obtain a three-dimensional coil contour;

[0035] The coil contour is controlled to be swept along a sweeping start plane in a set manner according to the shape of the coil contour, so as to obtain a coil model; the sweeping start plane is a plane with a plurality of circles; the circles are obtained by drawing a circle with a set radius on the set plane with the intersection of the coil contour and the set plane as the center; the set plane is a plane constructed on a surface where the coil contour is located;

[0036] Performing electromagnetic excitation simulation processing on the coil model to obtain a magnetic induction intensity distribution diagram; the magnetic induction intensity distribution diagram represents the magnetic induction intensity value corresponding to each arc length in the coil model;

[0037] According to the magnetic induction intensity distribution diagram, determine whether the electromagnetic field flux density of the coil model is within the set density range; if so, prepare the coil according to the coil model; if not, after changing the first radius, the first height, the second radius and the second height, return to the step of "constructing a first cylinder according to the first radius and the first height; constructing a second cylinder according to the second radius and the second height".

[0038] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0039] The embodiment of the present invention provides a coil simulation preparation system and method, which constructs a first cylinder and a second cylinder that are perpendicular and intersecting; then converts the intersection portion of the first cylinder and the second cylinder, i.e., the intersection cylinder, into a curve segment to obtain a three-dimensional coil contour; according to the shape of the coil contour and in a set manner, a sweep is performed from a sweep starting surface to obtain a coil model; electromagnetic excitation simulation processing is performed according to the coil model to obtain a magnetic induction intensity distribution diagram; the magnetic induction intensity distribution diagram represents the magnetic induction intensity values ​​corresponding to each arc length in the coil model; then, according to the magnetic induction intensity distribution diagram, it is determined whether the electromagnetic field flux density of the coil model is within a set density range; if so, the coil is prepared according to the coil model, and if not, the parameters of the first cylinder and the second cylinder are changed until the electromagnetic field flux density of the coil model is within the set density range; because the coil model construction and simulation are combined, a reliable basis can be provided for actual coil preparation, so that the performance of the coil prepared according to the coil model and the simulation results is better, therefore, the present invention can efficiently and conveniently realize the simulation preparation of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 A structural diagram of a coil simulation preparation system provided by an embodiment of the present invention;

[0042] Figure 2 A flow chart of a coil simulation preparation method provided by an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the positional relationship between a first cylinder and a second cylinder provided in an embodiment of the present invention;

[0044] Figure 4 A schematic diagram of the structure of an intersection column provided in an embodiment of the present invention;

[0045] Figure 5 A schematic diagram of a coil profile provided by an embodiment of the present invention;

[0046] Figure 6 A schematic diagram of a sweep start surface provided by an embodiment of the present invention;

[0047] Figure 7 A schematic diagram of a coil model provided by an embodiment of the present invention;

[0048] Figure 8A front view of a coil model provided by an embodiment of the present invention;

[0049] Fig. 9 A schematic diagram of magnetic induction intensity distribution provided in an embodiment of the present invention.

[0050] Explanation of symbols:

[0051] Cylinder construction module-1, conversion module-2, coil model construction module-3, simulation module-4, processing module-5. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] The purpose of the present invention is to provide a coil simulation preparation system and method, which can realize the simulation preparation of coils efficiently and conveniently.

[0054] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] Example 1

[0056] like Figure 1 As shown, an embodiment of the present invention provides a coil simulation preparation system, which includes: a cylinder construction module 1, a conversion module 2, a coil model construction module 3, a simulation module 4 and a processing module 5.

[0057] The conversion module 2 is connected to the column construction module 1 ; the coil model construction module 3 is connected to the conversion module 2 ; the simulation module 4 is connected to the coil model construction module 3 ; and the processing module 5 is connected to the simulation module 4 .

[0058] The cylinder construction module 1 is used to construct a first cylinder and a second cylinder; the first cylinder and the second cylinder are perpendicular and intersecting; the intersection portion of the first cylinder and the second cylinder is an intersection cylinder.

[0059] In practical applications, the column construction module 1 can use Comsol software to construct the column. The two vertically intersecting cylinders constructed are the first cylinder and the second cylinder. The positional relationship between the first cylinder and the second cylinder is as follows: Figure 3 shown.

[0060] The radius of the first cylinder is r1, the height is h1, and the y-axis is established along the axial direction of the first cylinder, dividing it into N-1 layers along the radial direction; the radius of the second cylinder is r2, the height is h2, and the z-axis is established along the axial direction of the second cylinder; (r1, r2, h1, and h2 are all determined by the curvature of the curved coil to be designed), N is the number of coil turns, such as Figure 4 In Comsol software, through the "Intersection" function in "Boolean Operation and Segmentation", the intersection of two cylinders, that is, the intersection cylinder, is obtained.

[0061] The conversion module 2 is used to convert the intersection cylinder into a curve line segment to obtain a three-dimensional coil contour. That is, the "Convert to Curve" function in the Comsol software is used to input the intersection of the two cylinders and convert it into a curve line segment. The "Delete Entity" function is used to delete the useless parts of the cylinder line segments, and only the line segments related to the coil contour are retained, such as Figure 5 shown.

[0062] Specifically, the conversion module 2 includes: an interception submodule, a conversion submodule and an output submodule.

[0063] The interception submodule is connected to the column construction module 1; the conversion submodule is connected to the interception submodule; and the output submodule is connected to the conversion submodule.

[0064] The interception submodule is used to intercept the intersection of the first cylinder and the second cylinder to obtain an intersection cylinder.

[0065] The conversion submodule is used to convert the intersection cylinder into a curve line segment; the output submodule is used to output the curve line segment to obtain the coil contour.

[0066] The coil model construction module 3 is used to sweep from the sweep starting surface in a set manner according to the shape of the coil contour to obtain a coil model; the sweep starting surface is a plane with multiple circles; the circle is obtained by drawing a circle with a set radius on the set plane with the intersection of the coil contour and the set plane as the center; the set plane is a plane constructed on a surface where the coil contour is located.

[0067] Set the plane to be an xy-shaped plane. The x-axis is constructed perpendicular to the y-axis. The direction of the x-axis is different from the axial direction of the second cylinder and is perpendicular to the z-axis. On the set plane, find the N intersections of the curve segment, i.e., the coil outline, and the set plane, and use them as the centers of N circles. Use the wire diameter of the curved coil as the radius, and draw N circles with the above centers in the set plane to obtain N circles, such as Figure 6 shown.

[0068] Sweeping is a modeling tool and a three-dimensional graphics modeling method. The cross section of a certain path, i.e., the sweeping start surface, can be processed to eventually form a three-dimensional graphics, i.e., a coil model.

[0069] Specifically, the coil model construction module 3 includes: a plane construction submodule, a processing submodule, a sweep start surface determination submodule and a coil model determination submodule.

[0070] The processing submodule is connected to the plane construction submodule and the conversion module 2 respectively; the sweep start surface determination submodule is connected to the processing submodule; and the coil model determination submodule is connected to the sweep start surface determination submodule.

[0071] The plane construction submodule is used to determine a set plane; the set plane is a plane constructed on a surface where the coil outline is located. The processing module 5 is used to determine multiple intersection points according to the coil outline and the set plane, and to draw a circle with a set radius on the set plane with the intersection point as the center to obtain multiple circles.

[0072] The sweep start surface determination submodule is used to determine a plane with multiple circles as the sweep start surface.

[0073] The coil model determination submodule is used to:

[0074] The first part structure of the coil contour is swept along one end of the sweep starting surface toward the other end of the sweep starting surface, and the sweeping is stopped when the number of sweeps reaches a first set value, thereby obtaining a first sweeping structure.

[0075] The second part structure of the coil contour is swept along one end of the sweep starting surface to the other end of the sweep starting surface, and the sweeping is stopped when the number of sweeps reaches a second set value to obtain a second sweeping structure; the second part structure is the remaining part structure of the coil contour minus the first part structure.

[0076] The coil model is determined according to the first sweep structure and the second sweep structure; the wire diameter value of the coil in the coil model is the value of the set radius.

[0077] In short, in practical applications, the geometry-sweep function in Comsol software is used, with N circles as the starting surface of the sweep, and the remaining curved circle line after deleting the line segment, that is, 3 / 4 of the coil contour, as the following ridge line, to perform the first sweep, and then add the first sweep again to sweep the remaining 1 / 4 of the coil contour. A total of 2N coil turns need to be swept to establish the coil model, such as Figure 7 and Figure 8 As shown in the figure, the coil model is a curved mosquito coil. After that, a sphere is constructed and set as an infinite element domain type region.

[0078] The simulation module 4 is used to perform electromagnetic excitation simulation processing according to the coil model to obtain a magnetic induction intensity distribution diagram; the magnetic induction intensity distribution diagram represents the magnetic induction intensity value corresponding to each arc length in the coil model. Fig. 9 It is the distribution diagram of magnetic induction intensity T.

[0079] Specifically, the simulation module 4 includes: an input submodule and a calculation submodule.

[0080] The input submodule is connected to the coil model building module 3; the calculation submodule is connected to the input submodule.

[0081] The input submodule is used to input voltage or current into the coil model; the calculation submodule is used to calculate the magnetic induction intensity corresponding to each arc length on the coil model according to the voltage or current, and obtain the magnetic induction intensity distribution diagram according to each magnetic induction intensity.

[0082] Processing module 5 is used to determine whether the electromagnetic field flux density of the coil model is within the set density range based on the magnetic induction intensity distribution diagram; if so, the coil is prepared according to the coil model; if not, it returns to "cylinder construction module 1" to change the parameters of the first cylinder and the second cylinder until the electromagnetic field flux density of the coil model is within the set density range; the parameters include: radius and height.

[0083] As an optional implementation, the material of the coil model is copper.

[0084] Example 2

[0085] like Figure 2 As shown, an embodiment of the present invention provides a coil simulation preparation method, which is applied to the coil simulation preparation system in Example 1, and the method includes:

[0086] Step 100: construct a first cylinder according to a first radius and a first height; construct a second cylinder according to a second radius and a second height; the first cylinder and the second cylinder are perpendicular and intersecting; the intersecting portion of the first cylinder and the second cylinder is an intersection cylinder.

[0087] Step 200: convert the intersection cylinder into curve segments to obtain a three-dimensional coil contour.

[0088] Step 300: Control the coil contour in a set manner, and sweep along the sweep starting surface according to the shape of the coil contour to obtain a coil model; the sweep starting surface is a plane with multiple circles; the circle is obtained by drawing a circle with a set radius on the set plane with the intersection of the coil contour and the set plane as the center; the set plane is a plane constructed on a surface where the coil contour is located.

[0089] Step 400: Perform electromagnetic excitation simulation processing on the coil model to obtain a magnetic induction intensity distribution diagram; the magnetic induction intensity distribution diagram represents the magnetic induction intensity value corresponding to each arc length in the coil model.

[0090] Step 500: judging whether the electromagnetic field flux density of the coil model is within a set density range according to the magnetic induction intensity distribution diagram.

[0091] If yes, then execute step 600 ; if no, then return to step 100 after changing the first radius, the first height, the second radius and the second height.

[0092] Step 600: Prepare the coil according to the coil model.

[0093] The present invention can effectively reduce the complexity of exploring the coil structure through experiments, shorten the modeling time, and improve work efficiency; and the analysis method of magnetic induction intensity provided by the present invention is: using Comsol software, by adding a three-dimensional section line, setting the coordinates of the two end points of the section line, so that it is located at the spatial position to be studied; then adding a one-dimensional drawing group-line result diagram, selecting the three-dimensional section line as the data set, and selecting mf.normB as the y-axis data, to obtain the distribution of the magnetic induction intensity T on the three-dimensional section line. Compared with directly analyzing in Comsol software, this method is more convenient and reliable.

[0094] The present invention combines coil model construction and simulation to provide a reliable basis for actual coil preparation, so that the performance of the coil prepared according to the coil model and simulation results is better.

[0095] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0096] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A coil simulation preparation system, characterized in that: The system comprises: A cylinder construction module, used to construct a first cylinder and a second cylinder; the first cylinder and the second cylinder are perpendicular and intersecting; the intersection portion of the first cylinder and the second cylinder is an intersection cylinder; A conversion module, connected to the cylinder construction module, for converting the intersection cylinder into a curve line segment to obtain a three-dimensional coil contour; A coil model construction module is connected to the conversion module and is used to sweep from a sweep starting plane in a set manner according to the shape of the coil contour to obtain a coil model; the sweep starting plane is a plane with a plurality of circles; the circle is obtained by drawing a circle with a set radius on the set plane with the intersection of the coil contour and the set plane as the center; the set plane is a plane constructed on a surface where the coil contour is located; A simulation module, connected to the coil model building module, is used to perform electromagnetic excitation simulation processing according to the coil model to obtain a magnetic induction intensity distribution diagram; the magnetic induction intensity distribution diagram represents the magnetic induction intensity value corresponding to each arc length in the coil model; a processing module connected to the simulation module, for determining whether the electromagnetic field flux density of the coil model is within a set density range according to the magnetic induction intensity distribution diagram; if so, preparing the coil according to the coil model; if not, returning to the "cylinder construction module" to change the parameters of the first cylinder and the second cylinder until the electromagnetic field flux density of the coil model is within the set density range; the parameters include: radius and height; The coil model construction module includes: a plane construction submodule, a processing submodule, a sweep start surface determination submodule and a coil model determination submodule; The processing submodule is connected to the plane construction submodule and the conversion module respectively; the sweep start surface determination submodule is connected to the processing submodule; the coil model determination submodule is connected to the sweep start surface determination submodule; The plane construction submodule is used to determine a set plane; the set plane is a plane constructed on a surface where the coil outline is located; The processing submodule is used to determine a plurality of intersection points according to the coil contour and the set plane, and to draw a circle with a set radius on the set plane with the intersection points as the center to obtain a plurality of circles; The sweep start surface determination submodule is used to determine a plane with a plurality of the circles as the sweep start surface; The coil model determination submodule is used to: Sweeping the first part of the coil contour along one end of the sweep starting surface toward the other end of the sweep starting surface, and stopping the sweeping when the number of sweeps reaches a first set value, thereby obtaining a first sweeping structure; Sweeping the second partial structure of the coil outline along one end of the sweep starting surface toward the other end of the sweep starting surface, and stopping the sweeping when the number of sweeps reaches a second set value, to obtain a second sweeping structure; the second partial structure is the remaining partial structure of the coil outline minus the first partial structure; The coil model is determined according to the first sweep structure and the second sweep structure; the wire diameter of the coil in the coil model is the value of the set radius.

2. The coil simulation preparation system according to claim 1, characterized in that: The conversion module includes: an interception submodule, a conversion submodule and an output submodule; The interception submodule is connected to the column construction module; the conversion submodule is connected to the interception submodule; the output submodule is connected to the conversion submodule; The interception submodule is used to intercept the intersection of the first cylinder and the second cylinder to obtain the intersection cylinder; The conversion submodule is used to convert the intersection cylinder into a curve line segment; The output submodule is used to output the curve line segment to obtain the coil contour.

3. The coil simulation preparation system according to claim 1, characterized in that: The simulation module includes: an input submodule and a calculation submodule; The input submodule is connected to the coil model building module; the calculation submodule is connected to the input submodule; The input submodule is used to input voltage or current to the coil model; The calculation submodule is used to calculate the magnetic induction intensity corresponding to each arc length on the coil model according to the voltage or current, and obtain the magnetic induction intensity distribution diagram according to each magnetic induction intensity.

4. The coil simulation preparation system according to claim 3, characterized in that: The material of the coil model is copper.

5. A coil simulation preparation method, characterized in that: The method is applied to the coil simulation preparation system according to any one of claims 1 to 4, and the method comprises: According to the first radius and the first height, a first cylinder is constructed; according to the second radius and the second height, a second cylinder is constructed; the first cylinder and the second cylinder are perpendicular and intersecting; the intersection of the first cylinder and the second cylinder is an intersection cylinder; Performing curve segment conversion on the intersection cylinder to obtain a three-dimensional coil contour; The coil contour is controlled to be swept along a sweeping start plane in a set manner according to the shape of the coil contour, so as to obtain a coil model; the sweeping start plane is a plane with a plurality of circles; the circles are obtained by drawing a circle with a set radius on the set plane with the intersection of the coil contour and the set plane as the center; the set plane is a plane constructed on a surface where the coil contour is located; Performing electromagnetic excitation simulation processing on the coil model to obtain a magnetic induction intensity distribution diagram; the magnetic induction intensity distribution diagram represents the magnetic induction intensity value corresponding to each arc length in the coil model; According to the magnetic induction intensity distribution diagram, it is determined whether the electromagnetic field flux density of the coil model is within the set density range; if so, the coil is prepared according to the coil model; if not, after changing the first radius, the first height, the second radius and the second height, the step of "constructing a first cylinder according to the first radius and the first height; constructing a second cylinder according to the second radius and the second height" is returned.

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