An equivalent method for mechanical parameters in the analysis of Roebel transposed conductor structures

Abstract

The present invention discloses an equivalent method for mechanical parameters in the structural analysis of a Roebel transposed conductor. First, the periodic structure of the transposed conductor (a single sintered flat copper wire) is separated as a typical representative volume element, and simplified physical models (a series model and a parallel model) are established to obtain its equivalent mechanical parameters. Subsequently, based on the specific structure of the Roebel transposed conductor, the mechanical parameters of the transposed conductor in the main direction are derived using the series model and the parallel model respectively. The equivalent method of the present invention can take into account the spatial misalignment and twisting caused by the transposition, and the equivalent method is closer to the actual structure and has a high equivalent accuracy.

Description

Technical Field

[0001] The invention belongs to the field of structural analysis, and in particular relates to an equivalent method for mechanical parameters in Roebel transposed conductor structure analysis. Background Art

[0002] In the manufacturing of motors and power transformers, in addition to the trend toward higher voltages and larger capacities, recent developments have significantly improved transformer performance, with significant results. These efforts include increasing efficiency and reducing losses, increasing power density, and lowering vibration and noise levels. For certain specialized motors (such as high-speed motors and those with high magnetic loads) or power transformers, the use of transposed conductors in winding coils can significantly reduce circulating and eddy current losses, improving operational reliability and lifespan. The smaller the diameter of the transposed conductor strands, the more beneficial this is for reducing AC losses.

[0003] Transposed conductors are enameled copper wires that are continuously transposed during the stranding process. They typically consist of a copper conductor, insulating varnish, an insulating layer, and an impregnating varnish. They are a composite structure with anisotropic physical properties. When conducting coil mechanical analysis or vibration analysis, detailed modeling of the transposed conductors—that is, establishing the detailed strand structure—inevitably results in a finite element analysis model with a large number of meshes, posing challenges to computer hardware and analysis time.

[0004] There are multiple approaches to analyzing transposed coil structures. A relatively simple approach for transposed conductors is to treat them as equivalent to a single isotropic copper conductor. This approach has the advantages of simple model establishment and material assignment, and fast calculation speed. However, since it ignores the anisotropy caused by the combination of dissimilar materials and the stiffness degradation caused by the transposition of strands, its material equivalent parameters differ significantly from the actual material properties, and cannot accurately assess the actual stress distribution of the transposed conductors.

[0005] In addition, some researchers have used composite material micromechanics analysis methods to derive the mechanical parameters of transposed conductors in the principal directions. The physical models of these analysis methods are often simplified to simple parallel or series models. However, due to the spatial misalignment and twisting caused by transposition, the actual structure of the transposed conductor is not a single parallel or series model, but a hybrid model of series-parallel or parallel-series.

[0006] Therefore, the equivalent parameters derived using a simple parallel model or series model cannot reflect the actual structure, affecting the accuracy of the simulation analysis results. Summary of the Invention

[0007] The purpose of the present invention is to overcome the shortcomings of the existing method for equivalent mechanical parameters of transposed conductors in motor or transformer structure analysis and to provide an equivalent method for mechanical parameters in transposed conductor structure analysis.

[0008] The technical solution adopted by the present invention to solve the technical problem is: an equivalent method for mechanical parameters in Roebel transposed conductor structure analysis, comprising the following steps:

[0009] Step 1, preparation process of Roebel transposed conductor: First, copper rod is drawn into a flat copper wire with a width × thickness (wmm × bmm). Then, the wmm × bmm flat copper wire is sintered with a polyimide film with a double-sided thickness of tmm to obtain a sintered flat copper wire with a size of w1mm × b1mm, where w1 = w + t and b1 = b + t. Finally, n w1mm × b1mm sintered flat copper wires are transposed to obtain a Roebel transposed conductor.

[0010] Step 2: Calculate the volume fractions of the flat copper wire and the paint film based on the mechanical parameters and dimensions of the single sintered flat copper wire and the paint film, including width, height, and thickness of the paint film on one side.

[0011] The Roebel transposed conductor separates its periodic structure, i.e., a single sintered flat copper wire, as a typical representative volume element. The volume fraction of the sintered flat copper wire is defined as:

[0012] w1=w f +w m , V f +V m =1,

[0013] Wherein, subscripts c, f, and m represent sintered flat copper wire, flat copper wire, and polyimide film, respectively. f ,V m are the volume fractions of the flat copper wire and polyimide film, A f ,A c ,A m are the areas of flat copper wire, sintered flat copper wire and polyimide film respectively;

[0014] Step 3: Establish physical models (series model and parallel model) of a single sintered flat copper wire. Based on the mechanical parameters and volume fraction obtained in step 2, derive the equivalent mechanical parameter expressions of the sintered flat copper wire under the series model and the parallel model respectively.

[0015] Step 3: Establishing a physical model of a single sintered flat copper wire (a parallel model and a series model), wherein the flat copper wire and the polyimide film have the same strain in the direction of force in the parallel model, and the flat copper wire and the polyimide film have the same stress in the direction of force in the series model;

[0016] Based on the mechanical parameters and volume fractions obtained in step 2, the equivalent mechanical parameter expressions of the sintered flat copper wire in the series model and the parallel model are derived respectively;

[0017] The equivalent elastic moduli under the series-parallel physical model are E c =E f V f +E m V m =E f V f +E m (1-V f ), Where E f ,E c ,E m are the equivalent elastic moduli of flat copper wire, sintered flat copper wire and polyimide film respectively. The equivalent elastic moduli of a single sintered flat copper wire in the length, width and thickness directions are

[0018]

[0019]

[0020]

[0021] Where E epoxy ,E cu are the elastic moduli of polyimide film and flat copper wire respectively;

[0022] The equivalent elastic moduli of the Roebel transposed conductor in the length, width and thickness directions are

[0023]

[0024]

[0025]

[0026] Step 4: For the specific structure of the Roebel transposed conductor, based on the obtained specifications and dimensions of the Roebel transposed conductor, including the number of turns of the sintered flat copper wire, the width and height of the transposed conductor, and the single-side thickness of the outer insulation of the transposed conductor, a series model and a parallel model of the Roebel transposed conductor along the three main directions of length, width, and thickness are established respectively. Based on the mechanical parameter expressions of the sintered flat copper wire under the series model and the parallel model obtained in Step 3, the equivalent mechanical parameters of the Roebel transposed conductor along the three main directions of length, width, and thickness are derived using the series model and the parallel model respectively.

[0027] Furthermore, in step 1, 19 sintered flat copper wires with a size of w1mm×b1mm are transposed to obtain a Roebel transposed conductor with a size of Wmm×Bmm.

[0028] Furthermore, in step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. I and III are polyimide films, and II is a flat copper wire. Assuming that I, II, and III are connected in parallel and are subjected to the same strain when subjected to external loads, the equivalent elastic modulus in the axis 1 direction can be obtained by deriving the formula from the parallel model of a single sintered copper flat wire:

[0029] E1=E I V I +E II V II +E III V III ,

[0030] in Substituting into the above formula we can get

[0031]

[0032] Furthermore, in the step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide films are I and III, and the flat copper wire is II. When parts I, II, and III form a parallel relationship and bear the same strain when subjected to external loads, and when parts II is formed in series by parts A, B, and C, the equivalent elastic modulus in the 2-axis direction can be obtained by deriving the formula from the parallel model of a single sintered copper flat wire as E2=E I V I +E II V II +E III V III ,in

[0033] There are

[0034] Substituting into the above formula we can get

[0035] Furthermore, in step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide films are I and III, and the flat copper wire is II. When parts I, II, and III form a parallel relationship and bear the same strain when subjected to external loads, and when parts II is formed in series by parts A, B, and C, the equivalent elastic modulus in the three axes can be obtained by deriving the formula from the parallel model of a single sintered copper flat wire as E3=E I V I +E II VII +E III V III ,in

[0036] There are

[0037] Substituting into the above formula we can get

[0038] Furthermore, in step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide film is I, and the flat copper wires are II to X. When the ten parts I to X form a parallel relationship and are subjected to the same strain under external load, I is formed by parts A, B, and C in series, and parts II to X are formed by parts D and E in series, the equivalent elastic modulus of the Roebel transposed conductor in the axis 1 direction can be obtained by deriving the formula from the parallel model of a single sintered copper flat wire:

[0039] E1 Roebel =E I V I +E II V II +.......+E X V X ,in There are Substituting into the above formula we can get

[0040] Furthermore, in step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide film is I, and the flat copper wires are II to X. When the ten parts I to X form a parallel relationship and are subjected to the same strain under external load, I is formed by parts A, B, and C in series, and parts II to X are formed by parts D and E in series, the equivalent elastic modulus of the Roebel transposed conductor in the two-axis direction can be obtained by deriving the formula from the parallel model of a single sintered flat copper wire:

[0041] E1 Roebel =E I V I +E II V II +.......+E X V X ,in

[0042] There are

[0043] Substituting into the above formula we can get

[0044] Furthermore, in the step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide film is I, and the flat copper wires are II to X. When the ten parts I to X form a series relationship and are subjected to the same strain under external load, I is formed by parts A, B, and C in series, and II to X are formed by parts D and E in parallel, the equivalent elastic modulus of the Roebel transposed conductor in the three-axis direction can be obtained from the series model of a single sintered copper flat wire: in

[0045] There are

[0046] Substituting into the above formula we can get

[0047] The beneficial effects of the present invention are as follows: the mechanical parameter equivalent method proposed by the present invention can take into account the spatial dislocation and twisting caused by transposition, and the equivalent method is closer to the actual structure and has a higher equivalent accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic structural diagram of a single sintered flat copper wire according to the present invention;

[0049] Figure 2 This is a schematic structural diagram of the Roebel transposed conductor of the present invention;

[0050] Figure 3 Schematic diagram of a representative volume unit of the sintered flat copper wire of the present invention;

[0051] Figure 4 This is a parallel stretching model of the sintered flat copper wire of the present invention;

[0052] Figure 5 This is a series stretching model of the sintered flat copper wire of the present invention;

[0053] Figure 6 Schematic diagram of a single sintered rectangular copper wire stretched in one axis direction according to the present invention;

[0054] Figure 7 Schematic diagram of biaxial stretching of a single sintered flat copper wire according to the present invention;

[0055] Figure 8 Schematic diagram of the three-axis stretching of a single sintered flat copper wire according to the present invention;

[0056] Figure 9 Schematic diagram of the Roebel transposed conductor 1 stretched in the axial direction of the present invention;

[0057] Figure 10 Schematic diagram of the biaxial stretching of the Roebel transposed conductor of the present invention;

[0058] Figure 11 Schematic diagram of the three-axis stretching of the Roebel transposed conductor of the present invention. DETAILED DESCRIPTION

[0059] The present invention will be described in further detail below with reference to the accompanying drawings.

[0060] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0061] The present invention proposes an equivalent method for mechanical parameters in the structural analysis of Roebel transposed conductors. By adopting a homogenization method, the transposed conductor is simplified and defined as an anisotropic material. This method simplifies the finite element analysis model of the transposed conductor, improves work efficiency, and enhances the accuracy of simulation analysis results. The steps are as follows.

[0062] Step 1, preparation process of Roebel transposed conductor: First, copper rod is drawn into a flat copper wire with width × thickness (wmm × bmm). Then the flat copper wire with wmm × bmm is sintered with polyimide film. The thickness of the polyimide film on both sides is tmm. Then, a sintered flat copper wire with w1mm × b1mm is obtained, where w1 = w + t and b1 = b + t. Finally, n pieces of w1mm × b1mm sintered flat copper wire are transposed to obtain Roebel transposed conductor. Figure 1 As shown in the figure, 19 w1mm×b1mm sintered flat copper wires are transposed to obtain a Wmm×Bmm Roebel transposed conductor (W=2×w1, B=10×b1). It should be noted that it is assumed that there is no gap between the sintered flat copper wires during transposition, that is, there is only a polyimide film with a thickness of tmm between the flat copper wires. To simplify the analysis, the length direction of the Roebel transposed conductor is defined as axis 1, the width direction of the Roebel transposed conductor is defined as axis 2, and the thickness direction of the Roebel transposed conductor is defined as axis 3, as shown in the figure. Figure 2 shown.

[0063] Step 2: Calculate the volume fractions of the flat copper wire and the paint film based on the mechanical parameters and dimensions including width, height, and thickness of the paint film obtained for the single sintered flat copper wire and the paint film.

[0064] For the above-mentioned Roebel transposed conductor, its periodic structure (single sintered copper flat wire) is separated as a typical representative volume element, such as Figure 3The representative volume element structure features a flat copper wire surrounded by a polyimide film with a length of l, a width of w1, and a height of b1. The polyimide film has a double-sided thickness of tmm. The volume fraction of the flat copper wire in this unit is the same as that of a single sintered flat copper wire. For ease of analysis, the width of the flat copper wire is defined as w f , in this case it is w, the width of the polyimide film is defined as w m , in this case it is t. For consistency, the subscripts c, f, and m represent sintered copper flat wire, copper flat wire, and polyimide film, respectively. Then w1=w f +w m , V f +V m =1, where V f ,V m are the volume fractions of the flat copper wire and polyimide film, A f ,A c ,A m are the areas of flat copper wire, sintered flat copper wire and polyimide film respectively.

[0065] Step 3: Establish a physical model of a single sintered flat copper wire (series model and parallel model), where the flat copper wire and the polyimide film in the parallel model have the same strain in the direction of force, and the flat copper wire and the polyimide film in the series model have the same stress in the direction of force. Based on the mechanical parameters and volume fractions obtained in step 2, the equivalent mechanical parameter expressions of the sintered flat copper wire in the series model and the parallel model are derived respectively.

[0066] According to the spatial structure of the transposed conductor, there are two models for analyzing and calculating the representative volume element sintered flat copper wire: Type I, parallel model; Type II, series model. Among them, the uniaxial stretching of the representative volume element sintered flat copper wire in the 1-axis direction is a parallel stretching model, such as Figure 4 As shown in Figure 2, the uniaxial stretching of the representative volume element sintered flat copper wire in the 2-axis and 3-axis directions is a series stretching model, as shown in Figure 2. Figure 5 According to the equal strain assumption and Hooke's law, the equivalent elastic moduli of sintered flat copper wire in the series-parallel physical model are:

[0067] E c =E f V f +E m V m =E f V f +E m (1-V f ),

[0068] Where E f ,E c,E m are the equivalent elastic moduli of flat copper wire, sintered flat copper wire and polyimide film, respectively.

[0069] for Figure 1 The deformation characteristics of the single sintered rectangular copper wire shown in the figure when it is uniaxially stretched in one direction can be simplified as follows: Figure 6 As shown in the figure, I and III are polyimide films, and II is a flat copper wire. Parts I, II, and III are connected in parallel. When subjected to external loads, we can assume that the three parts are subject to the same strain.

[0070] The equivalent elastic modulus in the 1-axis direction can be obtained by deriving the formula from the parallel model of a single sintered copper flat wire:

[0071] E1=E I V I +E II V II +E III V III ,

[0072] in Substituting into the above formula we can get:

[0073]

[0074] Where E epoxy ,E cu are the elastic moduli of polyimide film and flat copper wire, respectively.

[0075] for Figure 1 The deformation characteristics of a single sintered rectangular copper wire when subjected to uniaxial tension in the two axial directions can be simplified as follows: Figure 7 As shown in the figure, I and III are polyimide films, and II is a flat copper wire. Parts I, II, and III are connected in parallel. When subjected to external loads, we can assume that all three parts experience the same strain. Part II, in turn, consists of parts A, B, and C connected in series, all experiencing the same stress. This means that a single sintered flat copper wire follows a parallel-series model in two directions.

[0076] The formula derived from the parallel model of a single sintered copper flat wire can be used to obtain the equivalent elastic modulus in the two-axis direction:

[0077] E2=E I V I +E II V II +E III V III ,in

[0078] There are

[0079] Substituting into the above formula we can get

[0080] for Figure 1 The deformation characteristics of a single sintered flat copper wire under uniaxial tension in the three axes can be simplified as follows: Figure 8 As shown in the figure, I and III are polyimide films, and II is a flat copper wire. Parts I, II, and III are connected in parallel. When subjected to external loads, we can assume that all three parts experience the same strain. Part II, in turn, consists of parts A, B, and C connected in series, all experiencing the same stress. This means that a single sintered flat copper wire follows a parallel-series model in all three axes.

[0081] The formula derived from the parallel model of a single sintered copper flat wire can be used to obtain the equivalent elastic modulus in the three-axis direction:

[0082] E3=E I V I +E II V II +E III V III ,in

[0083] There are

[0084] Substituting into the above formula we can get

[0085] for Figure 2 The deformation characteristics of the Roebel transposed conductor shown in FIG. 1 when subjected to uniaxial tension in the 1-axis direction can be simplified as follows: Figure 9 As shown, the ten components, I, II, III, IV, V, VI, VII, VIII, IX, and X, are connected in parallel. When subjected to external loads, we can assume that all ten components experience the same strain. Component I consists of three components connected in parallel, A, B, and C. Components II, III, ..., and X consist of two components connected in parallel, D and E.

[0086] The equivalent elastic modulus of the Roebel transposed conductor in the 1-axis direction can be obtained by deriving the formula from the parallel model of a single sintered copper flat wire as E1 Roebel =E I V I +E II V II +.......+E X V X ,in

[0087] There are

[0088] Substituting into the above formula we can get

[0089] for Figure 2 The deformation characteristics of the Roebel transposed conductor shown in FIG. 1 when subjected to uniaxial tension in the 1-axis direction can be simplified as follows: Figure 10 As shown, the ten components, I, II, III, IV, V, VI, VII, VIII, IX, and X, are connected in parallel. When subjected to external loads, we can assume that all ten components experience the same strain. I is composed of components A, B, and C connected in series, while components II, III, ..., and X are composed of components D and E connected in series.

[0090] The equivalent elastic modulus of the Roebel transposed conductor in the two-axis direction is E1, which is derived from the parallel model of a single sintered copper flat wire. Roebel =E I V I +E II V II +.......+E X V X ,in

[0091] There are

[0092] Substituting into the above formula we can get

[0093] for Figure 2 The deformation characteristics of the Roebel transposed conductor shown in FIG. 1 when subjected to uniaxial tension in the 1-axis direction can be simplified as follows: Figure 11 As shown, the ten components, I, II, III, IV, V, VI, VII, VIII, IX, and X, are connected in series. When subjected to external loads, we can assume that all ten components experience the same stress. I is composed of three components, A, B, and C, connected in parallel. The nine components, II, III, ..., and X, are composed of two components, D and E, connected in parallel.

[0094] The equivalent elastic modulus of the Roebel transposed conductor in the three-axis direction can be obtained by deriving the formula from the series model of a single sintered copper flat wire:

[0095]

[0096] in There are Substituting into the above formula we can get:

[0097]

[0098] Step 4: For the specific structure of the Roebel transposed conductor, according to the obtained specifications and dimensions of the Roebel transposed conductor, including the number of turns of the sintered flat copper wire, the width and height of the transposed conductor, and the single-side thickness of the insulation of the transposed conductor, respectively establish the Roebel transposed conductor series model and parallel model along the three main directions of length, width and thickness. According to the mechanical parameter expressions of the sintered flat copper wire under the series model and parallel model obtained in step 3 and the specifications and dimensions of the Roebel transposed conductor, respectively use the series model and parallel model to derive the equivalent mechanical parameters of the Roebel transposed conductor along the three main directions of length, width and thickness. That is, in the formula On this basis, combined with the relevant dimensions of the transposed conductor, the equivalent mechanical parameters of the Roebel transposed conductor along the three main directions of length, width and thickness can be derived.

[0099] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. An equivalent method for mechanical parameters in the analysis of Roebel transposed conductor structures, characterized by: Includes the following steps Step 1: First, a copper rod is prepared into a width of w mm thickness b mm flat copper wire, and then the flat copper wire is sintered with polyimide film, the thickness of the polyimide film on both sides is t mm, get w 1 mm× b 1 mm sintered flat copper wire w 1 = w + t , b 1 = b + t , and finally the Roebel transposed conductor is obtained by transposing n sintered flat copper wires; Step 2: Calculate the volume fraction of the flat copper wire and polyimide film based on the mechanical parameters and dimensions of the single sintered flat copper wire and polyimide film, including width, height, and thickness of the paint film on one side: ， Subscript c 、 f 、 m They represent sintered flat copper wire, flat copper wire, and polyimide film respectively. V f , V m are the volume fractions of the flat copper wire and polyimide film, A f , A c , A m are the areas of flat copper wire, sintered flat copper wire and polyimide film respectively; Step 3: Establish a series-parallel physical model of a single sintered flat copper wire, wherein the flat copper wire and the polyimide film have the same strain in the direction of force in the parallel model, and the flat copper wire and the polyimide film have the same stress in the direction of force in the series model. Based on the mechanical parameters and volume fraction, the equivalent mechanical parameter expressions of the sintered flat copper wire under the series-parallel physical model are derived respectively; The equivalent elastic moduli under the series-parallel physical model are ， In the formula E f , E c , E m are the equivalent elastic moduli of flat copper wire, sintered flat copper wire and polyimide film respectively. The equivalent elastic moduli of a single sintered flat copper wire in the length, width and thickness directions are ， ， ， In the formula E epoxy , E cu are the elastic moduli of polyimide film and flat copper wire respectively; The equivalent elastic moduli of the Roebel transposed conductor in the length, width and thickness directions are ， ， ； Step 4: Based on the specifications of the Roebel transposed conductor and the dimensions including the number of turns of the sintered flat copper wire, the width and height of the transposed conductor, and the thickness of the single side of the insulation of the transposed conductor, a physical model of the Roebel transposed conductor in series and parallel along the length, width, and thickness is established respectively. Based on the mechanical parameter expression of the sintered flat copper wire, the equivalent mechanical parameters of the Roebel transposed conductor along the three main directions of length, width, and thickness are derived.

2. The equivalent method for mechanical parameters in the analysis of Roebel transposed conductor structure according to claim 1, characterized in that: The step 1 uses 19 w 1 mm× b 1 The sintered flat copper wire of mm is replaced W mm× B mm Roebel transposed conductor.

3. The equivalent method for mechanical parameters in the analysis of Roebel transposed conductor structure according to claim 1 or 2, characterized in that: In step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide films are defined as I and III, and the flat copper wire is defined as II. When parts I, II, and III are connected in parallel and subjected to the same strain under external load, the equivalent elastic modulus in the axis 1 direction can be obtained from the parallel model of a single sintered copper flat wire: ,in ， ， ， Substituting into the above formula we can get .

4. The equivalent method for mechanical parameters in the analysis of Roebel transposed conductor structure according to claim 3, characterized in that: In step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide films are I and III, and the flat copper wire is II. When parts I, II, and III form a parallel relationship and bear the same strain when subjected to external loads, and when parts II is formed in series by parts A, B, and C, the equivalent elastic modulus in the two-axis direction can be obtained from the parallel model of a single sintered copper flat wire: ,in ， ， ， There are ， ， Substituting into the above formula we can get .

5. The equivalent method for mechanical parameters in the analysis of Roebel transposed conductor structure according to claim 3, characterized in that: In step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide films are I and III, and the flat copper wire is II. When parts I, II, and III form a parallel relationship and bear the same strain when subjected to external loads, and when parts II is formed in series by parts A, B, and C, the equivalent elastic modulus in the three axes can be obtained from the parallel model of a single sintered copper flat wire: ,in ， ， ， There are ， ， Substituting into the above formula we can get .

6. The equivalent method for mechanical parameters in the analysis of Roebel transposed conductor structure according to claim 1 or 2, characterized in that: In the step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide film is I, and the flat copper wires are II to X. When the ten parts I to X form a parallel relationship and are subjected to the same strain under external load, I is formed by parts A, B, and C in series, and II to X are formed by parts D and E in series, the equivalent elastic modulus of the Roebel transposed conductor in the axis 1 direction can be obtained from the parallel model of a single sintered flat copper wire: ,in ， ， ， There are ， ， Substituting into the above formula we can get .

7. The equivalent method for mechanical parameters in the analysis of Roebel transposed conductor structure according to claim 6, characterized in that: In step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide film is I, and the flat copper wires are II to X. When the ten parts I to X form a parallel relationship and are subjected to the same strain under external load, I is formed by parts A, B, and C in series, and II to X are formed by parts D and E in series, the equivalent elastic modulus of the Roebel transposed conductor in the two-axis direction can be obtained from the parallel model of a single sintered copper flat wire: ,in ， ， ， There are ， ， Substituting into the above formula we can get .

8. The equivalent method for mechanical parameters in the analysis of Roebel transposed conductor structure according to claim 1 or 2, characterized in that: In the step 3, the length, width, and thickness directions of the Roebel transposed conductor are defined as axis 1, axis 2, and axis 3, respectively. The polyimide film is I, and the flat copper wires are II to X. When the ten parts I to X form a series relationship and are subjected to the same strain under external load, I is formed by parts A, B, and C in series, and II to X are formed by parts D and E in parallel, the equivalent elastic modulus of the Roebel transposed conductor in the three-axis direction can be obtained from the series model of a single sintered copper flat wire: ,in ， ， ， There are ， ， Substituting into the above formula we can get .

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