Method and device for determining excitation current of non-crystalline-silicon steel combined three-dimensional wound core

Abstract

The application discloses a kind of amorphous-silicon steel combined three-dimensional wound core excitation current determination method and equipment, belong to the field of combined three-dimensional wound core.According to the established amorphous-silicon steel combined three-dimensional wound core excitation equivalent circuit model and equivalent magnetic circuit model, the equivalent circuit-magnetic circuit coupling model of amorphous-silicon steel combined three-dimensional wound core is obtained, and the fourth-order Runge-Kutta algorithm is used to solve the equivalent circuit-magnetic circuit coupling model, i.e.The excitation current of amorphous-silicon steel combined three-dimensional wound core can be obtained, and the magnetization characteristics of combined three-dimensional wound core are accurately and quickly analyzed.

Description

Technical Field

[0001] This invention relates to the field of composite three-dimensional wound cores, and in particular to a method and apparatus for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core. Background Technology

[0002] Three-dimensional wound cores are typically made of amorphous alloys and grain-oriented silicon steel. Amorphous alloys offer the advantage of low loss density, but also suffer from low saturation flux density and high magnetostriction. Grain-oriented silicon steel, on the other hand, boasts high saturation flux density and low magnetostriction, but exhibits relatively high loss density. These contrasting properties prevent current three-dimensional wound cores from simultaneously achieving low no-load loss and low vibration noise. Combining amorphous alloys and grain-oriented silicon steel to create an amorphous-silicon steel composite three-dimensional wound core can integrate the advantages of both materials.

[0003] Due to the difference in magnetic permeability between amorphous alloys and grain-oriented silicon steel, the excitation mechanism of the composite core at different stages of magnetization remains unclear. Calculating the excitation current of the composite core using the finite element method faces the problem of enormous computational complexity. Establishing an open-circuit excitation equivalent circuit-magnetic circuit coupling model for the transformer core can solve the problem of high computational complexity in the finite element method. Therefore, establishing an equivalent circuit-magnetic circuit coupling model for an amorphous-silicon steel composite three-dimensional wound core is of great significance for accurately and quickly analyzing the magnetization characteristics of the composite core. Summary of the Invention

[0004] The purpose of this invention is to provide a method and device for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core. By establishing an equivalent circuit-magnetic circuit coupling model of the amorphous-silicon steel composite three-dimensional wound core, the magnetization characteristics of the composite three-dimensional wound core can be analyzed accurately and quickly.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A method for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core includes:

[0007] Establish an excitation equivalent circuit model for a sandwich-structured amorphous-silicon steel composite three-dimensional wound iron core;

[0008] Based on the sandwich structure of the amorphous-silicon steel composite three-dimensional wound core, the flux continuity theorem, and Ampere's circuital law, an equivalent magnetic circuit model of the amorphous-silicon steel composite three-dimensional wound core is established.

[0009] Based on the equivalent magnetic circuit model, expressions characterizing the nonlinear magnetization properties of amorphous and silicon steel materials are obtained;

[0010] Substituting the expression characterizing the nonlinear magnetization characteristics of amorphous and silicon steel materials into the excitation equivalent circuit model, an equivalent circuit-magnetic circuit coupling model of the amorphous-silicon steel combined three-dimensional wound core is obtained.

[0011] The equivalent circuit-magnetic circuit coupling model was solved using the fourth-order Runge-Kutta algorithm to determine the excitation current of the amorphous-silicon steel composite three-dimensional wound core.

[0012] A device for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core includes:

[0013] A memory for storing computer software programs; the computer software programs are used to implement the aforementioned method for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core.

[0014] A processor, connected to the memory, is used to retrieve and execute the computer software program.

[0015] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0016] This invention discloses a method and device for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core. Based on the established equivalent circuit model and equivalent magnetic circuit model of the amorphous-silicon steel composite three-dimensional wound core, the equivalent circuit-magnetic circuit coupling model of the amorphous-silicon steel composite three-dimensional wound core is obtained. The equivalent circuit-magnetic circuit coupling model is solved by the fourth-order Runge-Kutta algorithm, and the excitation current of the amorphous-silicon steel composite three-dimensional wound core can be obtained, realizing accurate and rapid analysis of the magnetization characteristics of the composite three-dimensional wound core. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating a method for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core, provided in an embodiment of the present invention;

[0019] Figure 2 A three-dimensional structural diagram of an existing amorphous-silicon steel composite three-dimensional wound core;

[0020] Figure 3 A cross-sectional view of the core column of an existing amorphous-silicon steel composite three-dimensional coiled iron core;

[0021] Figure 4 A single-frame three-view diagram of an existing amorphous-silicon steel composite solid coil core;

[0022] Figure 5 A schematic diagram of the three-phase excitation equivalent circuit model of the amorphous-silicon steel composite three-dimensional wound core provided in an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of the three-phase equivalent magnetic circuit model of the amorphous-silicon steel composite three-dimensional wound core provided in an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the nonlinear single-value magnetization curve of an amorphous material provided in an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the nonlinear single-value magnetization curve of silicon steel material provided in an embodiment of the present invention;

[0026] Figure 9 This is a schematic diagram of the calculation results of the excitation current of the amorphous-silicon steel combined three-dimensional wound core provided in an embodiment of the present invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The purpose of this invention is to provide a method and device for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core. By establishing an equivalent circuit-magnetic circuit coupling model of the amorphous-silicon steel composite three-dimensional wound core, the magnetization characteristics of the composite three-dimensional wound core can be analyzed accurately and quickly.

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown in the figure, an embodiment of the present invention provides a method for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core, comprising:

[0031] Step 1: Establish the excitation equivalent circuit model of the sandwich structure amorphous-silicon steel composite three-dimensional wound iron core.

[0032] The "sandwich" structure of the amorphous-silicon steel composite three-dimensional wound core is as follows: Figures 2-4 As shown, its excitation equivalent circuit model is as follows: Figure 5 As shown. According to Kirchhoff's voltage theorem, the governing equations of this equivalent circuit model are:

[0033]

[0034]

[0035]

[0036] In the formula, u A u B and u C These are the three-phase excitation voltages of the amorphous-silicon steel composite three-dimensional wound core; i A i B and i C These are the three-phase excitation currents of the amorphous-silicon steel composite three-dimensional wound core; R is the resistance of the excitation coil; L is the leakage inductance, which can be ignored if leakage flux is not considered; e A e B and e C These are the three-phase magnetomotive forces of the three-dimensional wound iron core, and their expressions are:

[0037]

[0038]

[0039]

[0040] In the formula, N is the number of turns of the excitation coil; Φ A Φ B and Φ C B is the core column magnetic flux of an amorphous-silicon steel composite three-dimensional wound core; mA B mB and B mC The magnetic flux density of the three-phase core column of the amorphous-silicon steel composite three-dimensional wound core; S t Let be the effective cross-sectional area of ​​the core column.

[0041] Combining equations (1)-(6), the control equations of the equivalent circuit model are rewritten as follows:

[0042]

[0043]

[0044]

[0045] Step 2: Based on the sandwich structure of the amorphous-silicon steel composite three-dimensional wound core, the flux continuity theorem, and Ampere's circuital law, establish the equivalent magnetic circuit model of the amorphous-silicon steel composite three-dimensional wound core.

[0046] The equivalent magnetic circuit model of the combined three-dimensional wound core with a "sandwich" structure is as follows: Figure 6As shown. According to the flux continuity theorem and Ampere's circuital law, the governing equations of this equivalent magnetic circuit model are:

[0047] B mA S t =B S1 S S1 +B S4 S S4 +B A1 S A1 -B S3 S S3 -B S6 S S6 -B A3 S A3 (10)

[0048] B mB S t =B S2 S S2 +B S5 S S5 +B A2 S A2 -B S1 S S1 -B S4 S S4 -B A1 S A1 (11)

[0049] B mC S t =B S3 S S3 +B S6 S S6 +B A3 S A3 -B S2 S S2 -B S5 S S5 -B A2 S A2 (12)

[0050] Ni A -Ni B =H S1 l S1 =H S4 l S4 =H A1 l A1 (13)

[0051] Ni B -Ni C =H S2 l S2 =H S5 l S5 =HA2 l A2 (14)

[0052] Ni C -Ni A =H S3 l S3 =H S6 l S6 =H A3 l A3 (15)

[0053] In the formula,

[0054] S t =2(S) S1 +S A1 +S S4 )=2(S S2 +S A2 +S S5 )=2(S S3 +S A3 +S S6 (16)

[0055]

[0056]

[0057]

[0058]

[0059] l S1 =l S2 =l S3 ≈2(H w +W w ) (twenty one)

[0060]

[0061] Where x1 and x2 are the proportions of inner and outer silicon steel, respectively; D is the diameter of the core column of the amorphous-silicon steel composite three-dimensional wound core; H w and W w These are the window height and width of the amorphous-silicon steel composite three-dimensional coiled core, respectively; K A and K S These are the lamination factors for amorphous and silicon steel three-dimensional coiled cores, respectively, with values ​​of 0.836 and 0.97; S A1 S A2 and S A3 These are the effective cross-sectional areas of the three intermediate amorphous materials; S S1 S S2 and S S3These are the effective cross-sectional areas of the three inner silicon steel layers; S S4 S S5 and S S6 These are the effective cross-sectional areas of the three outer silicon steel layers; B A1 B A2 and B A3 These are the magnetic flux densities of three intermediate amorphous materials; B S1 B S2 and B S3 These are the magnetic flux densities of the three inner silicon steel layers; B S4 B S5 and B S6 These are the magnetic flux densities of the three outer silicon steel layers; H A1 H A2 and H A3 These are the magnetic field strengths of the three intermediate amorphous materials; H S1 H S2 and H S3 These are the magnetic field strengths of the three inner silicon steel layers; H S4 H S5 and H S6 These are the magnetic field strengths of the three outer silicon steel layers; A1 l A2 and l A3 These are the magnetic circuit lengths of the three intermediate amorphous materials; l S1 l S2 and l S3 These are the magnetic circuit lengths of the three inner silicon steel layers; l S4 l S5 and l S6 These are the magnetic circuit lengths of the three outer silicon steel layers.

[0062] Step 3: Based on the equivalent magnetic circuit model, obtain the expressions characterizing the nonlinear magnetization properties of amorphous and silicon steel materials.

[0063] According to equations (10)-(12), the expressions characterizing the nonlinear magnetization properties of amorphous and silicon steel materials in the circuit control equations are obtained as follows:

[0064]

[0065] (twenty four)

[0066]

[0067] From equations (13)-(15), we obtain

[0068]

[0069]

[0070]

[0071]

[0072]

[0073]

[0074]

[0075]

[0076]

[0077] In the formula, the dB / dH term represents the differential permeability of amorphous and silicon steel, which can be obtained from the single-value magnetization curves of amorphous and silicon steel, as shown in the figure. Figure 7 and Figure 8 As shown. This represents the differential permeability of the three inner silicon steel layers. This represents the differential permeability of the three outer silicon steel layers. This represents the differential permeability of the three intermediate amorphous materials.

[0078] Step 4: Substitute the expression characterizing the nonlinear magnetization characteristics of amorphous and silicon steel materials into the excitation equivalent circuit model to obtain the equivalent circuit-magnetic circuit coupling model of the amorphous-silicon steel combined three-dimensional wound core.

[0079] Substituting equations (23)-(34) into the circuit control equations (7)-(9), we obtain the equivalent circuit-magnetic circuit coupling model of the amorphous-silicon steel composite three-dimensional wound core as follows:

[0080]

[0081]

[0082]

[0083] The equivalent circuit-magnetic circuit coupling model of the above amorphous-silicon steel composite three-dimensional wound core is rewritten in the following matrix form:

[0084]

[0085] In the formula, K represents a parameter matrix related to the differential permeability of amorphous and silicon steel, core size parameters, leakage inductance, and number of coil turns. mnLet be the element in the m-th row and n-th column of K, where m = 1, 2, 3 and n = 1, 2, 3; u represents the parameter matrix related to the excitation voltage source; R represents the coil resistance matrix; and i represents the three-phase excitation current matrix.

[0086] Step 5: Use the fourth-order Runge-Kutta algorithm to solve the equivalent circuit-magnetic circuit coupling model to determine the excitation current of the amorphous-silicon steel composite three-dimensional wound core.

[0087] The above system of differential equations can be solved using the fourth-order Runge-Kutta algorithm. The calculation steps are as follows:

[0088] ① Set i A i B i C At the initial value of the j-th time step (where j = 0), set the iteration time step size Δt, and let...

[0089] ② Calculate the parameters o1, p1, q1 at the j-th time step:

[0090]

[0091] ③ Calculate the parameters o2, p2, q2 at the j-th time step:

[0092]

[0093] ④ Calculate the parameters o3, p3, q3 at the j-th time step:

[0094]

[0095] ⑤ Calculate the parameters o4, p4, q4 at the j-th time step:

[0096]

[0097] ⑥ Calculate the excitation current value at the (j+1)th time step:

[0098]

[0099] ⑦ Take the excitation current value of the (j+1)th time step as the new initial value, repeat ②-⑥, calculate the excitation current value of the next time step, and stop the calculation when the preset time is reached.

[0100] The three-phase excitation current of the amorphous-silicon steel composite three-dimensional wound core calculated in this embodiment is as follows: Figure 9 As shown.

[0101] This invention can accurately solve the excitation current of the amorphous-silicon steel composite three-dimensional wound core with a "sandwich" structure, thereby providing technical support for analyzing the excitation mechanism of the composite core and guiding the design of the composite three-dimensional wound core structure.

[0102] This invention also provides a device for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core, comprising:

[0103] A memory for storing computer software programs; the computer software programs are used to implement the aforementioned method for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core.

[0104] A processor, connected to the memory, is used to retrieve and execute the computer software program.

[0105] The processor includes:

[0106] The circuit model building module is used to build the excitation equivalent circuit model of the sandwich-structured amorphous-silicon steel composite three-dimensional wound iron core.

[0107] The magnetic circuit model building module is used to build an equivalent magnetic circuit model of the amorphous-silicon steel composite three-dimensional wound core based on the sandwich structure of the amorphous-silicon steel composite three-dimensional wound core, the flux continuity theorem, and Ampere's circuital law.

[0108] The magnetization characteristic acquisition module is used to obtain expressions characterizing the nonlinear magnetization characteristics of amorphous and silicon steel materials based on the equivalent magnetic circuit model.

[0109] The coupling model acquisition module is used to substitute the expression characterizing the nonlinear magnetization characteristics of amorphous and silicon steel materials into the excitation equivalent circuit model to obtain the equivalent circuit-magnetic circuit coupling model of the amorphous-silicon steel combined three-dimensional wound core.

[0110] The solution module is used to solve the equivalent circuit-magnetic circuit coupling model using the fourth-order Runge-Kutta algorithm to determine the excitation current of the amorphous-silicon steel composite three-dimensional wound core.

[0111] For example, the memory is a computer-readable storage medium.

[0112] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0113] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core, characterized in that, include: Establish an excitation equivalent circuit model for a sandwich-structured amorphous-silicon steel composite three-dimensional wound iron core; Based on the sandwich structure of the amorphous-silicon steel composite three-dimensional wound core, the flux continuity theorem, and Ampere's circuital law, an equivalent magnetic circuit model of the amorphous-silicon steel composite three-dimensional wound core is established. Based on the equivalent magnetic circuit model, expressions characterizing the nonlinear magnetization properties of amorphous and silicon steel materials are obtained; Substituting the expression characterizing the nonlinear magnetization characteristics of amorphous and silicon steel materials into the excitation equivalent circuit model, an equivalent circuit-magnetic circuit coupling model of the amorphous-silicon steel combined three-dimensional wound core is obtained. The equivalent circuit-magnetic circuit coupling model was solved using the fourth-order Runge-Kutta algorithm to determine the excitation current of the amorphous-silicon steel composite three-dimensional wound core. The control equation of the excitation equivalent circuit model is: In the formula, u A , u B and u C These are the three-phase excitation voltages of the amorphous-silicon steel composite three-dimensional wound core; i A , i B and i C These are the three-phase excitation currents of the amorphous-silicon steel composite three-dimensional wound core; R The resistance of the excitation coil; L Leakage inductance; N This refers to the number of turns of the excitation coil; S t This represents the effective cross-sectional area of ​​the core column; B mA , B mB and B mC The magnetic flux density of the three-phase core column of the amorphous-silicon steel composite three-dimensional wound iron core; t For time; The governing equations of the equivalent magnetic circuit model are: In the formula, ； in, x 1 and x 2 represents the proportions of inner and outer silicon steel, respectively; D The diameter of the core column of the amorphous-silicon steel composite three-dimensional coiled iron core; H w and W w These are the window height and width of the amorphous-silicon steel composite three-dimensional coiled core, respectively. K A and K S These are the lamination factors for amorphous and silicon steel three-dimensional coiled cores, respectively, with values ​​of 0.836 and 0.

97. S A1 , S A2 and S A3 These are the effective cross-sectional areas of the three intermediate amorphous materials; S S1 , S S2 and S S3 These are the effective cross-sectional areas of the three inner layers of silicon steel; S S4 , S S5 and S S6 These are the effective cross-sectional areas of the three outer silicon steel layers; B A1 , B A2 and B A3 These are the magnetic flux densities of three intermediate amorphous materials; B S1 , B S2 and B S3 These are the magnetic flux densities of the three inner silicon steel layers, respectively. B S4 , B S5 and B S6 These are the magnetic flux densities of the three outer silicon steel layers, respectively; H A1 , H A2 and H A3 These are the magnetic field strengths of the three intermediate amorphous particles; H S1 , H S2 and H S3 These are the magnetic field strengths of the three inner layers of silicon steel; H S4 , H S5 and H S6 These are the magnetic field strengths of the three outer silicon steel layers, respectively; l A1 , l A2 and l A3 These are the magnetic circuit lengths of the three intermediate amorphous materials; l S1 , l S2 and l S3 These are the magnetic circuit lengths of the three inner silicon steel layers; l S4 , l S5 and l S6 These are the magnetic circuit lengths of the three outer silicon steel layers.

2. The method for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core according to claim 1, characterized in that, The expression characterizing the nonlinear magnetization properties of amorphous and silicon steel materials is as follows: In the formula, 、 、 This represents the differential permeability of the three inner silicon steel layers. 、 、 This represents the differential permeability of the three outer silicon steel layers. 、 、 This represents the differential permeability of the three intermediate amorphous materials.

3. The method for determining the excitation current of the amorphous-silicon steel composite three-dimensional wound core according to claim 2, characterized in that, The equivalent circuit-magnetic circuit coupling model is as follows: in, ; K This represents a parameter matrix related to the differential permeability of amorphous and silicon steel, core dimensions, leakage inductance, and number of coil turns. k mn for K The element in the m-th row and n-th column of the array, where m = 1, 2, 3 and n = 1, 2, 3; u This represents a parameter matrix related to the excitation voltage source; R Represents the coil resistance matrix; i This represents the three-phase excitation current matrix.

4. The method for determining the excitation current of an amorphous-silicon steel composite three-dimensional wound core according to claim 3, characterized in that, The equivalent circuit-magnetic circuit coupling model is solved using the fourth-order Runge-Kutta algorithm to determine the excitation current of the amorphous-silicon steel composite three-dimensional wound core, specifically including: Set the iteration time step Δ t At the same time, let the parameters ,parameter and parameters ; Preset i A , i B , i C In the j Initial values ​​for each time step; where, j It is an integer; Using formula Calculate the first j Parameters at each time step o 1. Parameters p 1 and parameters q 1; According to the j Parameters at each time step o 1. Parameters p 1. Parameters q 1 and iteration time step Δ t Using the formula Calculate the first j Parameters at each time step o 2. Parameters p 2 and parameters q 2; According to the j Parameters at each time step o 2. Parameters p 2. Parameters q 2 and the iteration time step Δ t Using the formula Calculate the first j Parameters at each time step o 3. Parameters p 3 and parameters q 3; According to the j Parameters at each time step o 3. Parameters p 3. Parameters q 3 and the iteration time step Δ t Using the formula Calculate the first j Parameters at each time step o 4. Parameters p 4 and parameters q 4; According to the j Parameters at each time step o 1. Parameters p 1. Parameters q 1. Parameters o 2. Parameters p 2. Parameters q 2. Parameters o 3. Parameters p 3. Parameters q 3. Parameters o 4. Parameters p 4 and parameters q 4. Using the formula Calculate the first j +1 time step three-phase excitation current , and ;in, , , Indicates the first j The three-phase excitation current at each time step; The first j The time step is updated to the 1st time step. j +1 time step, the j +1 time step of the three-phase excitation current as i A , i B , i C The initial value is then returned to the step "using the formula". Calculate the first j Parameters at each time step o 1. Parameters p 1 and parameters q 1”, calculate the three-phase excitation current for the next time step until the preset time is reached.

5. A device for determining the excitation current of an amorphous-silicon steel combined three-dimensional wound core, characterized in that, include: A memory for storing computer software programs; the computer software programs are used to implement the method for determining the excitation current of the amorphous-silicon steel composite three-dimensional wound core as described in any one of claims 1-4. A processor, connected to the memory, is used to retrieve and execute the computer software program.

6. The device for determining the excitation current of an amorphous-silicon steel combined three-dimensional wound core according to claim 5, characterized in that, The processor includes: The circuit model building module is used to build the excitation equivalent circuit model of the sandwich-structured amorphous-silicon steel composite three-dimensional wound iron core. The magnetic circuit model building module is used to build an equivalent magnetic circuit model of the amorphous-silicon steel composite three-dimensional wound core based on the sandwich structure of the amorphous-silicon steel composite three-dimensional wound core, the flux continuity theorem, and Ampere's circuital law. The magnetization characteristic acquisition module is used to obtain expressions characterizing the nonlinear magnetization characteristics of amorphous and silicon steel materials based on the equivalent magnetic circuit model. The coupling model acquisition module is used to substitute the expression characterizing the nonlinear magnetization characteristics of amorphous and silicon steel materials into the excitation equivalent circuit model to obtain the equivalent circuit-magnetic circuit coupling model of the amorphous-silicon steel combined three-dimensional wound core. The solution module is used to solve the equivalent circuit-magnetic circuit coupling model using the fourth-order Runge-Kutta algorithm to determine the excitation current of the amorphous-silicon steel composite three-dimensional wound core.

7. The device for determining the excitation current of an amorphous-silicon steel combined three-dimensional wound core according to claim 5, characterized in that, The memory is a computer-readable storage medium.

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