Calculation method and verification method of powder material exertion rate of magnetic powder core for inductor

Abstract

The invention discloses a calculation method and a verification method of a powder material exertion rate of a magnetic powder core for an inductor, and the method comprises the steps: 1, carrying out the analysis and calculation of a finished inductor through a finite element analysis method according to the design parameters and slice data of the finished inductor, 2, combining the actual relative magnetic conductivity of the magnetic powder core powder material to obtain a powder material exertion rate, and obtaining the magnetic core powder material exertion rate according to the actual relative magnetic conductivity of the magnetic powder core powder material and the pre-estimated inductance value of the finished product inductor with the design parameters and the pre-estimated relative magnetic conductivity of the magnetic powder core powder material; 3, obtaining an estimated specification of the finished inductor in actual production according to the change rate of the specification of the finished inductor, 4, obtaining the estimated relative permeability of the magnetic powder core powder material for the finished inductor with the design parameter specification corresponding to the finished inductor in combination with the powder material exertion rate, and comparing the estimated relative permeability with the relative permeability of the magnetic powder core powder material which is actually applied in production. And the precision of the powder material exertion rate is evaluated. According to the method, the problem of blind selection of variables can be solved by utilizing a finite element analysis method, so that selection of the magnetic powder core material for the inductor is accurately guided.

Description

Technical Field

[0001] The present invention relates to the field of analysis and calculation of materials used in electronic components, and in particular to a method for calculating the powder material utilization rate of a magnetic powder core for inductance and a method for verifying the same. Background Art

[0002] As the application scope of inductors becomes wider and wider, the requirements for the electromagnetic properties of inductors are also getting higher and higher. They are usually required to have small size, high current resistance, wide operating frequency range, good DC bias resistance, good magnetic shielding performance, etc. The electromagnetic properties of inductors are mainly related to the structural parameters of the inductors and the electromagnetic parameters of the magnetic core materials. Therefore, to achieve its high requirements, it is necessary not only to optimize the specifications of the inductors but also to make reasonable selection of the magnetic powder core materials for the inductors. The selection of magnetic powder core materials for inductors is based on the inductance calculation formula combined with the inductance parameters. Since the magnetic flux distribution of the inductor in the electromagnetic field cannot be truly observed, the variables in the formula can only be determined based on experience under the existing technology. In actual production, the relative magnetic permeability of the magnetic powder core of the final finished inductor is inconsistent with the relative magnetic permeability data of the magnetic powder core used in actual production. This is caused by the fact that the magnetic powder cannot play a 100% role. Therefore, the selection of inductor magnetic powder core powder materials using existing technology will result in an inaccurate solution due to the uncertainty of variables and powder material utilization rate. Although empirical values ​​are added for calculation when using existing technology, there is also blindness and randomness. In addition, the existing calculation method is not only inaccurate but also difficult to calculate. Summary of the invention

[0003] The present invention aims to solve the deficiencies of the above-mentioned prior art and proposes a calculation method for the powder material utilization rate of a magnetic powder core for inductors and a verification method thereof, so as to use the finite element analysis method to solve the problem of blind selectivity of variables, thereby accurately guiding the selection of powder materials for magnetic powder cores for inductors, thereby being more practical, quick and accurate.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme:

[0005] The method for calculating the powder material utilization rate of a magnetic powder core for inductance of the present invention is characterized in that it comprises the following steps:

[0006] S1. Determine the design parameters of the finished inductor to be produced, and collect the magnetic powder core material data, working conditions, and test parameters used in the actual production of the finished inductor;

[0007] S2. Use equations (1) and (2) to calculate the magnetic path length of the finished inductor with the design parameter specifications under the electromagnetic field. and magnetic circuit cross-sectional area :

[0008] (1)

[0009] (2)

[0010] In formula (1) and formula (2), Indicates the number of layers of coil winding on the finished inductor with design parameter specifications. represents the height of a single coil, Indicates the total number of turns on the finished inductor with design parameter specifications; Represents the width of a single coil, It represents the magnetic circuit area at the center column of the finished inductor with design parameter specifications. Represents the magnetic circuit area of ​​the inductor A side, Represents the magnetic circuit area of ​​the inductor B side, It represents the magnetic circuit area of ​​the rest of the finished inductor with design parameter specifications;

[0011] S3. Use formula (3) to obtain the estimated inductance value of the finished inductor with the design parameter specifications :

[0012] (3)

[0013] In formula (3), It indicates the relative magnetic permeability of the actual magnetic powder core material used in the production of the finished inductor with design parameter specifications;

[0014] S4, slicing the finished inductor with the design parameter specifications that have been produced and measuring the specifications of the slices, so as to obtain the real slicing specification data of the finished inductor with the design parameter specifications, and establishing a 3D model of the finished inductor with the slicing specifications according to the real slicing specification data, and then using the finite element analysis method to perform electromagnetic field analysis on the finished inductor with the slicing specifications, and simulate the eddy current effect of the finished inductor in the actual working process;

[0015] According to the actual production conditions and test parameters, the finite element analysis method is used to mesh the 3D model of the finished inductor with slice specifications, set the current excitation and boundary conditions;

[0016] S5. Use formula (4) to obtain the estimated relative magnetic permeability of the magnetic powder core material used in the actual production of the finished inductor with slice specifications: :

[0017] (4)

[0018] In formula (4), L1 represents the measured inductance value of the finished inductor with slice specifications, It indicates the magnetic path length of the finished inductor with slice specifications under the electromagnetic field. It indicates the magnetic circuit cross-sectional area of ​​the finished inductor with slice specifications under the electromagnetic field;

[0019] S6. Calculate the utilization rate K of the magnetic powder core powder material using formula (5) m :

[0020] (5).

[0021] The method for calculating the powder material utilization rate of the magnetic powder core for inductance described in the present invention is also characterized in that the design parameters of the finished inductor in S1 include: the page swing length , Page width , Page thickness , Middle column length , Center column width , Middle column height , Body length 、Body width , body height , Coil width , coil height , the number of layers of the coil C, the total number of coil turns N; where, = + + , Indicates the distance between the middle column and the A side of the inductor;

[0022] The magnetic powder core material data used in the actual production of the finished inductor is the actual relative magnetic permeability μ of the magnetic powder core material;

[0023] The working conditions and test parameters include: current excitation I and frequency f of current excitation.

[0024] Furthermore, in S2 , , , It is calculated according to formula (6) to formula (9):

[0025] (6)

[0026] (7)

[0027] (8)

[0028] (9).

[0029] 4. The method for calculating the powder material utilization rate of the magnetic powder core for inductance according to claim 2 is characterized in that the actual slice specification data in S4 includes: the page swing length , Page width , Page thickness , Middle column length , Center column width , Middle column height , Body length 、Body width , body height , Coil width , coil height ;in, , Indicates the distance between the center column of the finished inductor and the A side of the inductor.

[0030] The method for verifying the powder material utilization rate of a magnetic powder core for inductance of the present invention is characterized in that it comprises the following steps:

[0031] S7. Based on the actual slice specification data and design parameters of the finished inductor with design parameter specifications, calculate the change rate K of the finished inductor specifications according to equations (10) to (20), including: the change rate of the page swing length , the rate of change of the page width , the change rate of the page thickness , the change rate of the middle column length , the change rate of the width of the middle column , the change rate of the middle column height , the rate of change of the body length , the change rate of the body width , the change rate of the body height , the rate of change of coil width , the rate of change of coil height :

[0032] (10)

[0033] (11)

[0034] (12)

[0035] (13)

[0036] (14)

[0037] (15)

[0038] (16)

[0039] (17)

[0040] (18)

[0041] (19)

[0042] (20)

[0043] S8. According to the design parameters and the rate of change K of the finished inductor specifications, the estimated specifications of the finished inductor during actual production are obtained, thereby establishing a 3D model of the finished inductor with the estimated specifications, and using the finite element analysis method to perform meshing, current excitation, and boundary condition setting on the 3D model of the finished inductor with the slice specifications;

[0044] S9. Use formula (21) to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with estimated specifications:

[0045] (twenty one)

[0046] In formula (21), It indicates the magnetic path length of the finished inductor with estimated specifications under the electromagnetic field. It indicates the cross-sectional area of ​​the magnetic circuit of the finished inductor with estimated specifications under the electromagnetic field;

[0047] S10, according to formula (22), the estimated relative permeability of the magnetic powder core material for the finished inductor with the estimated specifications corresponding to the design parameter specifications is calculated. :

[0048] (twenty two)

[0049] S11. and Compare to evaluate accuracy.

[0050] An electronic device of the present invention includes a memory and a processor, wherein the memory is used to store a program that supports the processor to execute the method, and the processor is configured to execute the program stored in the memory.

[0051] The present invention provides a computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and the computer program executes the steps of the method when executed by a processor.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] 1. The existing technical method for selecting magnetic powder core materials for inductors is based on a calculation formula combined with inductor parameters. However, since the magnetic flux distribution of the inductor in the electromagnetic field cannot be truly observed, some variables in the formula can only be selected based on experience. Therefore, the selection of magnetic powder core materials for inductors using the existing technology is blind and inaccurate. The present invention uses finite element simulation analysis software to simulate the magnetic flux distribution of the inductor in the electromagnetic field, and uses finite element analysis to accurately obtain the variables in the formula based on the magnetic flux distribution, thereby making the selection of magnetic powder core materials for inductors accurate and reasonable;

[0054] 2. In actual production, the relative magnetic permeability of the magnetic powder core of the final finished inductor is inconsistent with the relative magnetic permeability data of the magnetic powder core calculated by the design parameters and actually applied. This is caused by the fact that the magnetic powder cannot fully play its role. When using the existing technology to select the magnetic powder core powder material of the inductor, due to the uncertainty of the change between the real relative magnetic permeability of the magnetic powder core powder material and the relative magnetic permeability of the magnetic powder core of the final finished inductor, the selection of the magnetic powder core powder material for the inductor based on experience will lead to inaccurate selection of the magnetic powder core powder material for the inductor, so that the inductor performance cannot meet the requirements. The present invention combines the real relative magnetic permeability of the magnetic powder core powder material with the relative magnetic permeability of the magnetic powder core of the finished inductor, introduces the concept of powder material utilization rate, and can determine the change between the real relative magnetic permeability of the magnetic powder core powder material and the relative magnetic permeability of the magnetic powder core of the final finished inductor, and can accurately guide the selection of magnetic powder core powder material for the inductor;

[0055] 3. When selecting magnetic powder core materials for inductors using existing technical methods, it is necessary to perform a large number of calculations based on the calculation formula combined with the inductor design parameters and the finished inductor specification parameters to obtain empirical values ​​to guide the work. It is easy to make calculation errors when processing a large amount of data, and it also takes a lot of time and manpower to verify the rationality of the design. However, the present invention introduces the concept of powder material utilization rate and combines it with the finite element analysis method to obtain a more accurate solution in a shorter time. In addition, using a computer to perform a large number of calculations by itself not only does not have the risk of calculation errors but also has a very high calculation efficiency. At the same time, the verification of the rationality of the design can also be completed in a shorter time. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0057] In this embodiment, a method for calculating the powder material utilization rate of a magnetic powder core for an inductor is as follows: Figure 1 As shown, the following steps are included:

[0058] S1. Determine the design parameters of the finished inductor to be produced, and collect the magnetic powder core material data, working conditions, and test parameters used in the actual production of the finished inductor;

[0059] The design parameters of the finished inductor include: page length , Page width , Page thickness , Middle column length , Center column width , Middle column height , Body length 、Body width , body height , coil width , coil height , the number of layers of the coil C, the total number of coil turns N; where, = + + , Indicates the distance between the middle column and the A side of the inductor;

[0060] The magnetic powder core material data used in the actual production of finished inductors is the actual relative magnetic permeability μ of the magnetic powder core material;

[0061] Working conditions and test parameters include: current excitation I=0.1A, current excitation frequency f=1MHz.

[0062] S2. Use equations (1) and (2) to calculate the magnetic path length of the finished inductor with the design parameter specifications under the electromagnetic field. and magnetic circuit cross-sectional area :

[0063] (1)

[0064] (2)

[0065] In formula (2) , , , Calculate according to formula (6)-formula (9):

[0066] (6)

[0067] (7)

[0068] (8)

[0069] (9)

[0070] In formula (1) and formula (2), It represents the magnetic circuit area at the center column of the finished inductor with design parameter specifications. Represents the magnetic circuit area of ​​the inductor A side, Represents the magnetic circuit area of ​​the inductor B side, It represents the magnetic circuit area of ​​the rest of the finished inductor with design parameter specifications.

[0071] S3. Use formula (3) to obtain the estimated inductance value of the finished inductor with the design parameter specifications :

[0072] (3)

[0073] In formula (3), It represents the relative magnetic permeability of the actual magnetic powder core material used in the production of the finished inductor with the design parameter specifications. Formula (3) can be used to preliminarily verify that the relative magnetic permeability of the finished inductor with the design parameter specifications is When the magnetic powder core material is used, is the estimated inductance value greater than the measured inductance value? ', estimated inductance value Compared with the measured inductance 'High, it also shows that the powder material cannot be used 100%, To compare 'Big problem.

[0074] S4, slicing the finished inductor with the design parameter specifications that have been produced and measuring the specifications of the slices, so as to obtain the real slicing specification data of the finished inductor with the design parameter specifications, and establishing a 3D model of the finished inductor with the slicing specifications according to the real slicing specification data, and then using the finite element analysis method to perform electromagnetic field analysis on the finished inductor with the slicing specifications, and simulate the eddy current effect of the finished inductor in the actual working process;

[0075] The actual slicing specifications include: page length , Page width , Page thickness , Middle column length , Center column width , Middle column height , Body length 、Body width , body height , coil width , coil height ;in, , Indicates the distance between the center column of the finished inductor and the A side of the inductor.

[0076] According to the actual production conditions and test parameters, the finite element analysis method is used to mesh the 3D model of the finished inductor with slice specifications, set AC current excitation and insulation boundary conditions;

[0077] S5. Use formula (4) to obtain the estimated relative magnetic permeability of the magnetic powder core material used in the actual production of the finished inductor with slice specifications: :

[0078] (4)

[0079] In formula (4), L1 represents the measured inductance value of the finished inductor with slice specifications, It indicates the magnetic path length of the finished inductor with slice specifications under the electromagnetic field. It represents the magnetic circuit cross-sectional area of ​​the finished inductor with slice specifications under the electromagnetic field. The variable parameters in formula (4) are obtained according to the slice specification data of the real finished inductor and calculated by finite element analysis method. The calculation result is highly accurate.

[0080] S6. Calculate the utilization rate K of the magnetic powder core powder material using formula (5) m :

[0081] (5)

[0082] By introducing the concept of powder material utilization, the true relative magnetic permeability of magnetic powder core powder can be determined. Estimated relative permeability of the magnetic powder core material used in the actual production of finished inductors with cut specifications The changes between them can accurately guide the selection of magnetic powder core materials for inductors.

[0083] In this embodiment, a method for verifying the powder material utilization rate of a magnetic powder core for an inductor includes the following steps:

[0084] S7. Based on the actual slice specification data and design parameters of the finished inductor with design parameter specifications, calculate the change rate K of the finished inductor specifications according to equations (10) to (20), including: the change rate of the page swing length , the rate of change of the page width , the change rate of the page thickness , the change rate of the middle column length , the change rate of the width of the middle column , the change rate of the middle column height , the rate of change of the body length , the change rate of the body width , the change rate of the body height , the rate of change of coil width , the rate of change of coil height According to the change rate K of the finished inductor specifications, combined with the design parameters of the finished inductor, the estimated specifications of the finished inductor in actual production can be obtained:

[0085] (10)

[0086] (11)

[0087] (12)

[0088] (13)

[0089] (14)

[0090] (15)

[0091] (16)

[0092] (17)

[0093] (18)

[0094] (19)

[0095] (20)

[0096] S8. According to the design parameters and the rate of change K of the finished inductor specifications, the estimated specifications of the finished inductor during actual production are obtained, thereby establishing a 3D model of the finished inductor with the estimated specifications, and using the finite element analysis method to mesh the 3D model of the finished inductor with the slice specifications, perform AC current excitation, and set insulation boundary conditions.

[0097] S9. Use formula (21) to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with estimated specifications:

[0098] (twenty one)

[0099] In formula (21), It indicates the magnetic path length of the finished inductor with estimated specifications under the electromagnetic field. It indicates the cross-sectional area of ​​the magnetic circuit of the finished inductor with estimated specifications under the electromagnetic field;

[0100] S10, according to formula (22), the estimated relative permeability of the magnetic powder core material for the finished inductor with the estimated specifications corresponding to the design parameter specifications is calculated. :

[0101] (twenty two)

[0102] S11. and Compare to evaluate accuracy.

[0103] In this embodiment, an electronic device includes a memory and a processor, wherein the memory is used to store a program that supports the processor to execute the above method, and the processor is configured to execute the program stored in the memory.

[0104] In this embodiment, a computer-readable storage medium stores a computer program on the computer-readable storage medium, and the computer program executes the steps of the above method when executed by a processor.

[0105] Example:

[0106] Taking the finished inductor with batch number LMSC20160652R2MTA as an example to calculate the powder material utilization rate, the actual relative magnetic permeability μ of the magnetic powder core powder material is 38.34, and the measured inductance value is , the design parameters of the finished inductor are shown in Table 1, the actual slice specification data are shown in Table 2, and the statistical table of the change rate K of the finished inductor specifications is shown in Table 3;

[0107] Taking the finished inductor with batch number LMSC201208R33MTA as an example to verify the accuracy of the powder material utilization rate, the actual relative magnetic permeability of the magnetic powder core powder is 32.21, and the measured inductance value is The design parameters of the finished inductor are shown in Table 4, and the estimated specifications of the finished inductor in actual production are shown in Table 5.

[0108] surface Design parameters of finished inductors

[0109]

[0110] According to the design parameters of the finished inductor in Table 1, a 3D model of the finished inductor with the design parameter specifications is established, and the AC current excitation and insulation boundary conditions are set. The finite element analysis method is used to perform simulation analysis and calculation to obtain the estimated inductance value of the finished inductor with the design parameter specifications. , the estimated inductance value is higher than the measured inductance value.

[0111] surface Real slice specification data

[0112]

[0113] According to the actual slicing specification data in Table 2, a 3D model of the finished inductor with slicing specifications is established, and the AC current excitation and insulation boundary conditions are set. The finite element analysis method is used for simulation analysis and calculation to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with slicing specifications. =33.41;

[0114] Calculate the powder utilization rate =0.8714.

[0115] Combining the data in Table 1 and Table 2, the change rate of the finished inductor specifications is calculated according to formula (10)-formula (20) and is statistically shown in Table 3;

[0116] surface Calculate the change rate K of the finished product inductance specification

[0117]

[0118] surface Design parameters of finished inductors

[0119]

[0120] According to the change rate K of the finished inductor specifications in Table 3, combined with the design parameters of the finished inductor in Table 4, the estimated specifications of the finished inductor in actual production are calculated and statistically listed in Table 5;

[0121] surface Calculate the estimated specifications of the finished inductor during actual production

[0122]

[0123] According to the estimated specification data of the finished inductor in actual production obtained by calculation in Table 5, a 3D model of the finished inductor is established, and the AC current excitation and insulation boundary conditions are set. The finite element analysis method is used for simulation analysis and calculation to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with the estimated specifications. =28.03;

[0124] Combined powder material utilization rate , using formula (22) to obtain the estimated relative permeability of the magnetic powder core material for the finished inductor with the estimated specifications corresponding to the design parameter specifications =32.17, and the relative error between it and the true relative permeability of the magnetic powder core material is only 0.124%. The accuracy is very high.

Claims

1. A method for calculating the powder material utilization rate of a magnetic powder core for inductance, characterized in that: The steps include: S1. Determine the design parameters of the finished inductor to be produced, and collect the magnetic powder core material data, working conditions, and test parameters used in the actual production of the finished inductor; S2. Use equations (1) and (2) to calculate the magnetic path length of the finished inductor with the design parameter specifications under the electromagnetic field. and magnetic circuit cross-sectional area : (1) (2) In formula (1) and formula (2), Indicates the number of layers of coil winding on the finished inductor with design parameter specifications. represents the height of a single coil, Indicates the total number of turns on the finished inductor with design parameter specifications; represents the width of a single coil, It represents the magnetic circuit area at the center column of the finished inductor with design parameter specifications. Represents the magnetic circuit area of ​​the inductor A side, Represents the magnetic circuit area of ​​the inductor B side, It represents the magnetic circuit area of ​​the rest of the finished inductor with design parameter specifications; S3. Use formula (3) to obtain the estimated inductance value of the finished inductor with the design parameter specifications : (3) In formula (3), It indicates the relative magnetic permeability of the actual magnetic powder core material used in the production of the finished inductor with design parameter specifications; S4, slicing the finished inductor with the design parameter specifications that have been produced and measuring the specifications of the slices, so as to obtain the real slicing specification data of the finished inductor with the design parameter specifications, and establishing a 3D model of the finished inductor with the slicing specifications according to the real slicing specification data, and then using the finite element analysis method to perform electromagnetic field analysis on the finished inductor with the slicing specifications, and simulate the eddy current effect of the finished inductor in the actual working process; According to the actual production conditions and test parameters, the finite element analysis method is used to mesh the 3D model of the finished inductor with slice specifications, set the current excitation and boundary conditions; S5. Use formula (4) to obtain the estimated relative magnetic permeability of the magnetic powder core material used in the actual production of the finished inductor with slice specifications: : (4) In formula (4), L1 represents the measured inductance value of the finished inductor with slice specifications, It indicates the magnetic path length of the finished inductor with slice specifications under the electromagnetic field. It indicates the magnetic circuit cross-sectional area of ​​the finished inductor with slice specifications under the electromagnetic field; S6. Calculate the utilization rate K of the magnetic powder core powder material using formula (5) m : (5)。 2. The method for calculating the powder material utilization rate of a magnetic powder core for inductance according to claim 1, characterized in that: The design parameters of the finished inductor in S1 include: , Page width , Page thickness , Middle column length , Center column width , Middle column height , Body length 、Body width , body height , Coil width , coil height , the number of layers of the coil C, the total number of coil turns N; where, = + + , Indicates the distance between the middle column and the A side of the inductor; The magnetic powder core material data used in the actual production of the finished inductor is the actual relative magnetic permeability μ of the magnetic powder core material; The working conditions and test parameters include: current excitation I and frequency f of current excitation.

3. The method for calculating the powder material utilization rate of a magnetic powder core for inductance according to claim 2, characterized in that: In S2 , , , It is calculated according to formula (6) to formula (9): (6) (7) (8) (9)。 4. The method for calculating the powder material utilization rate of a magnetic powder core for inductance according to claim 2, characterized in that: The actual slice specification data in S4 includes: page swing length , Page width , Page thickness , Middle column length , Center column width , Middle column height , Body length 、Body width , body height , Coil width , coil height ;in, , Indicates the distance between the center column of the finished inductor and the A side of the inductor.

5. A method for verifying the powder material utilization rate of a magnetic powder core for inductance, characterized in that: The steps include: S7. Based on the actual slice specification data and design parameters of the finished inductor with design parameter specifications, the change rate K of the finished inductor specifications is calculated according to equations (10) to (20), including: the change rate of the page swing length , the rate of change of the page width , the change rate of the page thickness , the change rate of the middle column length , the change rate of the width of the middle column , the change rate of the middle column height , the rate of change of the body length , the change rate of the body width , the change rate of the body height , the rate of change of coil width , the rate of change of coil height : (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) S8. According to the design parameters and the rate of change K of the finished inductor specifications, the estimated specifications of the finished inductor during actual production are obtained, thereby establishing a 3D model of the finished inductor with the estimated specifications, and using the finite element analysis method to perform meshing, current excitation, and boundary condition setting on the 3D model of the finished inductor with the slice specifications; S9. Use formula (21) to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with estimated specifications: .

6. (21) In formula (21), It indicates the magnetic path length of the finished inductor with estimated specifications under the electromagnetic field. It indicates the cross-sectional area of ​​the magnetic circuit of the finished inductor with estimated specifications under the electromagnetic field; S10, according to formula (22), the estimated relative permeability of the magnetic powder core material for the finished inductor with the estimated specifications corresponding to the design parameter specifications is calculated. : (22) S11. and Compare to evaluate accuracy.

7. An electronic device, comprising a memory and a processor, characterized in that: The memory is used to store a program that supports a processor to execute the method according to any one of claims 1 to 5, and the processor is configured to execute the program stored in the memory.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are performed.

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