Coil eddy current loss calculation method, device and equipment based on model simulation
By constructing a transformer coil simulation model, the magnetic flux density distribution outside and inside the window of each turn of conductor is calculated. Combined with the yoke coverage length, the problem that the influence of the yoke was not considered in the existing technology is solved, and the accuracy of eddy current loss calculation is improved.
Patent Information
- Application Number
- CN202511051237.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-29
- Publication Date
- 2025-11-28
AI Technical Summary
Existing two-dimensional axisymmetric field simulation methods cannot accurately account for the influence of the iron core's yoke on the magnetic field distribution, resulting in errors in the calculation of transformer coil eddy current losses.
By constructing a transformer coil simulation model, the magnetic field distribution outside and inside the window of each turn of conductor is calculated. Combined with the yoke coverage length, the transverse and longitudinal eddy current losses are calculated respectively, and then the coil eddy current losses are calculated.
The accuracy of coil eddy current loss calculation has been improved, the influence of the iron yoke on the magnetic field distribution has been taken into account, and the calculation error has been reduced.
Smart Images
Figure CN121031024A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of power systems, and in particular to a coil eddy current loss calculation method, device and equipment based on model simulation. BACKGROUND
[0002] The transformer is an indispensable key equipment in the power system, and the transformer coil is its core component. When the transformer operates, the current passes through the coil, and the magnetic field generated by the current can pass through the coil. However, a special loss, namely eddy current loss, is generated in this process. The eddy current loss is caused by the change of the magnetic field in the conductor. When the magnetic field passes through the conductor, an induced current is generated inside the conductor, which forms eddy current, thereby causing energy to be dissipated in the form of heat. The size of the eddy current loss mainly depends on the magnetic field strength and distribution of the conductor. In the design and operation of the transformer, accurate calculation of the eddy current loss is crucial for improving the efficiency and reliability of the transformer.
[0003] Currently, there are two main methods for calculating the eddy current loss of the transformer coil conductor: analytical formula calculation and two-dimensional axisymmetric field simulation calculation. The analytical formula calculation method relies on physical principles and can directly calculate the eddy current loss through mathematical formulas. The advantage of this method is fast calculation speed, but because the analytical formula is often based on some simplified assumptions, it is difficult to fully reflect the actual complex situation. Two-dimensional axisymmetric field simulation calculation is a more accurate method, which establishes a two-dimensional axisymmetric model of the transformer and uses numerical methods such as finite element analysis to simulate the magnetic field distribution, thereby calculating the eddy current loss. This method can more accurately consider the distribution and change of the magnetic field, so the calculation accuracy is much higher than that of the analytical formula calculation method.
[0004] However, since the core composed of multiple core columns and yokes of the transformer is a planar structure, and the coil is a circular structure, when the yoke of the core column is close to the end of the coil, it will have a significant impact on the magnetic field distribution in the coil area, which also causes the existing two-dimensional axisymmetric field simulation calculation method to have some errors. SUMMARY
[0005] The embodiment of the present application provides a coil eddy current loss calculation method, device and equipment based on model simulation, so as to solve the problem that the existing two-dimensional axisymmetric field simulation calculation method cannot consider the influence of the yoke of the core on the magnetic field distribution, and has some errors in calculation.
[0006] In a first aspect, the embodiment of the present application provides a coil eddy current loss calculation method based on model simulation, comprising: Based on a pre-constructed transformer coil simulation model, simulation calculations are performed on the transformer coil to obtain the magnetic flux density distribution outside and inside the window for each turn of the conductor in the transformer coil. The transformer coil simulation model includes the transformer coil, the core column, and the yoke. The window is a window composed of the core column and the yoke. In the end region of the transformer coil, the transverse magnetic density in the magnetic flux density distribution outside the window is greater than the transverse magnetic density in the magnetic flux density distribution inside the window, and the longitudinal magnetic density in the magnetic flux density distribution outside the window is less than the longitudinal magnetic density in the magnetic flux density distribution inside the window. For each turn of conductor, based on the corresponding magnetic flux density distribution outside the window, magnetic flux density distribution inside the window, and yoke coverage length, the transverse eddy current loss and longitudinal eddy current loss of the conductor are obtained. Calculate the eddy current loss of the transformer coil based on the transverse and longitudinal eddy current losses of each turn of conductor.
[0007] Secondly, embodiments of the present invention provide a coil eddy current loss calculation device based on model simulation, comprising: The simulation module is used to perform simulation calculations on the transformer coil based on a pre-built transformer coil simulation model, to obtain the magnetic flux density distribution outside and inside the window of each turn of the conductor in the transformer coil. The transformer coil simulation model includes the transformer coil, the core column, and the yoke; the window is a window composed of the core column and the yoke; in the end region of the transformer coil, the transverse magnetic density in the magnetic flux density distribution outside the window is greater than the transverse magnetic density in the magnetic flux density distribution inside the window, and the longitudinal magnetic density in the magnetic flux density distribution outside the window is less than the longitudinal magnetic density in the magnetic flux density distribution inside the window. The determination module is used to determine the transverse eddy current loss and longitudinal eddy current loss of each turn of conductor based on the corresponding external magnetic flux density distribution, internal magnetic flux density distribution and yoke coverage length of the conductor. The calculation module is used to calculate the coil eddy current loss of the transformer coil based on the transverse eddy current loss and the longitudinal eddy current loss of each turn of the conductor.
[0008] Thirdly, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method described in the first aspect or any possible implementation thereof.
[0009] In this embodiment of the invention, a pre-constructed transformer coil simulation model is used to simulate and calculate the transformer coil, obtaining the external and internal magnetic flux density distributions of each turn of the conductor. The internal magnetic flux density distribution reflects the influence of the yoke on the magnetic field of the transformer coil. By combining the external and internal magnetic flux density distributions, the transverse and longitudinal eddy current losses of each turn of the conductor are obtained, and the coil eddy current losses of the transformer coil are calculated. Both the transverse and longitudinal eddy current losses take into account the influence of the yoke. Furthermore, the calculated coil eddy current losses also take into account the influence of the yoke on the magnetic flux density distribution, improving the accuracy of the coil eddy current loss calculation. Attached Figure Description
[0010] Figure 1 This is a flowchart illustrating the implementation of the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention. Figure 2 This is a schematic diagram of a transformer coil for a model simulation-based coil eddy current loss calculation method provided in an embodiment of the present invention. Figure 3 This is a projection diagram of a transformer coil based on the model simulation-based coil eddy current loss calculation method provided in this embodiment of the invention. Figure 4 This is a schematic diagram of an external two-dimensional axisymmetric model of the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention; Figure 5 This is a schematic diagram of the in-window two-dimensional axisymmetric model of the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention; Figure 6a This is a magnetic field diagram of an external two-dimensional axisymmetric model of the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention. Figure 6b This is a partial enlarged view of the bottom of the coil in the two-dimensional axisymmetric model outside the window of the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention; Figure 6c This is a schematic diagram of the magnetic field lines direction of the two-dimensional axisymmetric model outside the window of the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention. Figure 7a This is a magnetic field diagram of a two-dimensional axisymmetric model within a window for a coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention. Figure 7b This is a partial enlarged view of the bottom of the coil in the two-dimensional axisymmetric model within the window of the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention; Figure 7c This is a schematic diagram of the magnetic field lines direction of a two-dimensional axisymmetric model within a window for the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention. Figure 8 This is a flowchart illustrating the implementation of step S110 of the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention. Figure 9 This is a flowchart illustrating the implementation of step S120 of the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention. Figure 10 This is a schematic diagram of the coil eddy current loss calculation device based on model simulation provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation
[0011] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0012] See Figure 1 The flowchart illustrating the implementation of the coil eddy current loss calculation method based on model simulation provided in this embodiment of the invention is described in detail below: Step S110: Based on the pre-constructed transformer coil simulation model, perform simulation calculations on the transformer coil to obtain the magnetic flux density distribution outside the window and inside the window for each turn of the conductor in the transformer coil; wherein, the transformer coil simulation model includes the transformer coil, the iron core column, and the iron yoke; the window is a window composed of the iron core column and the iron yoke; in the end region of the transformer coil, the transverse magnetic density in the magnetic flux density distribution outside the window is greater than the transverse magnetic density in the magnetic flux density distribution inside the window, and the longitudinal magnetic density in the magnetic flux density distribution outside the window is less than the longitudinal magnetic density in the magnetic flux density distribution inside the window.
[0013] In some embodiments, the pre-built transformer coil simulation model includes an outside-window two-dimensional axisymmetric model and an inside-window two-dimensional axisymmetric model. Figure 2 A simplified schematic diagram of a transformer coil is shown below. Figure 2 The core and coil form an external two-dimensional axisymmetric model, while the core, yoke, and coil form an internal two-dimensional axisymmetric model. The coil consists of multiple turns of wire, each turn having a height of *b* and a thickness of *a*. A two-dimensional projection of the transformer coil yields both the external and internal axisymmetric models. The models can include one transformer coil or multiple coaxially arranged transformer coils, with a certain distance between the yoke and the transformer coils. Furthermore, a transformer oil tank exists outside the core and transformer coils.
[0014] In some embodiments, Figure 3 This is a projection diagram of the transformer coil, based on... Figure 3 It can be seen that the two-dimensional axisymmetric model outside the window consists of an iron core column and a coil, while the two-dimensional axisymmetric model inside the window consists of an iron core column, a coil, and an iron yoke.Figure 4 This is a simplified schematic diagram of a two-dimensional axisymmetric model outside the window, which only includes the core column and the coil. The magnetic flux density distribution outside the window refers to the magnetic flux density distribution calculated using the two-dimensional axisymmetric model outside the window. Figure 5 This is a simplified schematic diagram of a two-dimensional axisymmetric model within a window, which includes a core column, coils, and a yoke. The magnetic flux density distribution within the window refers to the magnetic flux density distribution calculated using this two-dimensional axisymmetric model. See also... Figure 3 When the two-dimensional axisymmetric model outside the window and the two-dimensional axisymmetric model inside the window are combined to form a transformer coil simulation model, they are arranged vertically with their axes on a straight line. This straight line is the axis of the transformer coil simulation model. The magnetic field diagram of the two-dimensional axisymmetric model outside the window is shown below. Figure 6a As shown, a magnified view of the bottom of the coil in the two-dimensional axisymmetric model outside the window is as follows. Figure 6b As shown, a schematic diagram of the magnetic field lines direction of the two-dimensional axisymmetric model outside the window is as follows. Figure 6c As shown, the magnetic field lines of the two-dimensional axisymmetric model within the window are as follows: Figure 7a As shown, a magnified view of the bottom of the coil in the two-dimensional axisymmetric model within the window is as follows. Figure 7b As shown, a schematic diagram of the magnetic field lines direction of the two-dimensional axisymmetric model inside the window is as follows. Figure 7c As shown, see Figure 6a , Figure 6b , Figure 6c and Figure 7a , Figure 7b , Figure 7c It can be seen that in the transformer coil end region, the transverse magnetic density in the magnetic flux distribution outside the window is greater than the transverse magnetic density in the magnetic flux distribution inside the window, and the longitudinal magnetic density in the magnetic flux distribution outside the window is less than the longitudinal magnetic density in the magnetic flux distribution inside the window.
[0015] See Figure 8 The specific processing method of the above step S110 includes steps S8101-S8103, the specific contents of which are as follows: Step S8101: Based on the transformer coil simulation model, perform simulation calculations on the transformer coil to obtain the overall magnetic flux density distribution of the transformer coil.
[0016] In some embodiments, by using a transformer coil simulation model to perform simulation calculations, the overall magnetic flux density distribution of the transformer coil can be obtained.
[0017] Step S8102: Determine the first position coordinates and the second position coordinates of each turn of wire based on the position of each turn of wire in the transformer coil.
[0018] In some embodiments, when determining the first and second position coordinates, a point can be selected as the origin on the axis of the transformer coil simulation model. The ordinates of the first and second position coordinates are then determined by the position of each turn of the conductor within the transformer coil and the longitudinal distance between the transformer coil and the origin on the axis. The abscissas are determined by the radius of the coil and the position of each turn of the conductor within the transformer coil. Other methods of determination are also possible and are not specifically limited here. The first position coordinates refer to the position coordinates of each turn of the conductor in the two-dimensional axisymmetric model outside the window, and the second position coordinates refer to the position coordinates of each turn of the conductor in the two-dimensional axisymmetric model inside the window.
[0019] In one possible implementation, step S8102 is specifically processed as follows: Based on the radius of the transformer coil and the position of each turn of wire within the transformer coil, determine the abscissa of each turn of wire; based on the position of each turn of wire within the transformer coil, calculate the first ordinate of each turn of wire; based on the abscissa and the first ordinate of each turn of wire, obtain the first position coordinate of each turn of wire; based on the transformer coil simulation model, determine the position difference between the first and second position coordinates of each turn of wire; based on the first position coordinate and the position difference, calculate the second position coordinate of each turn of wire.
[0020] In some embodiments, the abscissa of the conductor can be calculated based on the radius of the transformer coil and the position of the conductor within the transformer coil. Since the transformer coil has a certain thickness, the abscissa of each turn of conductor differs depending on its position within the coil. Therefore, it is necessary to calculate the abscissa of each turn of conductor by combining the radius of the transformer coil and the position of the conductor within it. The position of the conductor within the transformer coil and the distance between the transformer coil and the origin of the coordinate system determine the ordinate of the first position coordinate of each turn of conductor, i.e., the first ordinate. The origin of the coordinate system can be located on the axis of the two-dimensional axisymmetric model outside the window and the two-dimensional axisymmetric model inside the window, or it can be located elsewhere. Since the axes of the two-dimensional axisymmetric model outside the window and the two-dimensional axisymmetric model inside the window are on the same straight line in the transformer coil simulation model, and the transformer coil remains unchanged, the abscissas of the first and second position coordinates are the same, both being the radius of the transformer coil. The distance between the first and second position coordinates is related to the height of the core column of the transformer simulation model and the distance between the two-dimensional axisymmetric model outside the window and the two-dimensional axisymmetric model inside the window.
[0021] Step S8103: Based on the first position coordinates, the second position coordinates, and the overall magnetic flux density distribution, the magnetic flux density distribution outside the window and the magnetic flux density distribution inside the window of each turn of the conductor in the transformer coil are obtained.
[0022] In some embodiments, the magnetic flux density distribution is extracted based on the first position coordinates on the overall magnetic flux density distribution, and the resulting magnetic flux density distribution is the magnetic flux density distribution outside the window. The magnetic flux density distribution is extracted based on the second position coordinates on the overall magnetic flux density distribution, and the resulting magnetic flux density distribution is the magnetic flux density distribution inside the window.
[0023] In one possible implementation, step S8103 is specifically processed as follows: based on the first position coordinates of each turn of the conductor, the external magnetic flux density distribution of the conductor corresponding to the first position coordinate is extracted at the corresponding position of the overall magnetic flux density distribution; based on the second position coordinates of each turn of the conductor, the internal magnetic flux density distribution of the conductor corresponding to the second position coordinate is extracted at the corresponding position of the overall magnetic flux density distribution.
[0024] It should be noted that the magnetic flux density distribution on the same turn of the conductor is consistent. In the overall magnetic flux density distribution, the magnetic flux density distribution corresponding to the first position coordinate is the magnetic flux density distribution outside the window of the conductor corresponding to the first position coordinate, and the magnetic flux density distribution corresponding to the second position coordinate is the magnetic flux density distribution inside the window of the conductor corresponding to the second position coordinate.
[0025] Step S120: For each turn of conductor, based on the corresponding external magnetic flux density distribution, internal magnetic flux density distribution and yoke coverage length, the transverse eddy current loss and longitudinal eddy current loss of the conductor are obtained.
[0026] In some embodiments, the transverse eddy current loss and longitudinal eddy current loss of each turn of conductor can be calculated by combining the magnetic flux density distribution outside the window, the magnetic flux density distribution inside the window, and the yoke coverage length.
[0027] See Figure 9 The specific processing of step S120 above may include steps S9201-S9203, the specific contents of which are as follows: Step S9201: Based on the corresponding magnetic flux density distribution outside the window of the conductor, the transverse magnetic flux density and the longitudinal magnetic flux density outside the window of the conductor are obtained.
[0028] In some embodiments, the corresponding external magnetic flux density distribution of the conductor is orthogonally decomposed into a transverse component and a longitudinal component. The value of the transverse component is the external transverse magnetic flux density of the conductor, and the value of the longitudinal component is the external longitudinal magnetic flux density of the conductor.
[0029] Step S9202: Based on the corresponding magnetic flux density distribution within the window of the conductor, the transverse magnetic flux density and the longitudinal magnetic flux density within the window of the conductor are obtained.
[0030] In some embodiments, the magnetic flux density distribution within the window of the conductor is orthogonally decomposed into a transverse component and a longitudinal component. The value of the transverse component is the transverse magnetic flux density within the window of the conductor, and the value of the longitudinal component is the longitudinal magnetic flux density within the window of the conductor.
[0031] Step S9203: Calculate the transverse eddy current loss and longitudinal eddy current loss of the conductor based on the transverse magnetic density outside the window, the longitudinal magnetic density outside the window, the transverse magnetic density inside the window, the longitudinal magnetic density inside the window, and the yoke coverage length.
[0032] In some embodiments, the yoke coverage length refers to the length of the portion of the conductor covered by the yoke. By combining the transverse magnetic density outside the window, the transverse magnetic density inside the window, and the yoke coverage length, the transverse eddy current loss of the conductor can be calculated. By combining the longitudinal magnetic density outside the window, the longitudinal magnetic density inside the window, and the yoke coverage length, the longitudinal eddy current loss of the conductor can be calculated.
[0033] In one possible implementation, step S9203 is specifically processed as follows: calculating the yoke coverage length of the conductor, and calculating the yoke uncovered length of the conductor based on the total length of the conductor and the yoke coverage length; calculating the transverse eddy current loss of the conductor based on the yoke coverage length, the yoke uncovered length, the transverse magnetic density outside the window and the transverse magnetic density inside the window; and calculating the longitudinal eddy current loss of the conductor based on the yoke coverage length, the yoke uncovered length, the longitudinal magnetic density outside the window and the longitudinal magnetic density inside the window.
[0034] It should be noted that the uncovered length of the yoke refers to the remaining portion of the conductor's circumference, i.e. When there are multiple iron core columns and corresponding one or more coils, It should be equivalently converted to a single core column. The formula for calculating the yoke coverage length is:
[0035] In the above formula, The length of the iron yoke coverage. The radius of each turn of wire in the coil; The width of the projected width of the yoke on the end face of the coil, outside the area covered by the yoke. =0, This refers to the number of iron yokes in the transformer. This represents the number of coils in the transformer.
[0036] For example, in a three-phase three-limb transformer, if the number of coils is 3 and the number of yokes is 4, then the formula for calculating the yoke coverage length is:
[0037] In some embodiments, the formula for calculating transverse eddy current loss is:
[0038] in, This refers to the transverse eddy current loss of the conductor. The resistivity of the conductor material. Angular frequency, Let 'a' be the vertical height of the conductor, 'a' be the conductor thickness, and 'S' be the cross-sectional area of the conductor, where S = ab. For the transverse eddy current loss outside the window. This refers to the transverse eddy current loss within the window. The length of the iron yoke coverage. This represents the length of the yoke that is not covered.
[0039] In some embodiments, the formula for calculating longitudinal eddy current loss is:
[0040] in, This represents the longitudinal eddy current loss of the conductor. For longitudinal eddy current losses outside the window, This refers to the longitudinal eddy current loss within the window.
[0041] By proportionally adding the transverse eddy current loss outside the window and the transverse eddy current loss inside the window using the covered length and uncovered length of the yoke, the final transverse eddy current loss is obtained. Similarly, by proportionally adding the longitudinal eddy current loss outside the window and the longitudinal eddy current loss inside the window, the final longitudinal eddy current loss is obtained. This improves the accuracy of calculating the transverse and longitudinal eddy current losses of the conductor.
[0042] Step S130: Calculate the coil eddy current loss of the transformer coil based on the transverse eddy current loss and longitudinal eddy current loss of each turn of conductor.
[0043] In some embodiments, the coil includes multiple turns of wire, and the coil eddy current loss is the sum of the eddy current losses of each turn of wire in the coil.
[0044] In some embodiments, after obtaining the eddy current loss of the transformer coil, the number of core columns in the transformer can also be determined, and the eddy current loss of the transformer coil can be obtained by multiplying the eddy current loss of the transformer coil by the number of core columns.
[0045] In one possible implementation, step S130 is specifically processed as follows: the transverse eddy current loss and the longitudinal eddy current loss of each turn of the conductor are added together to obtain the conductor eddy current loss of each turn of the conductor; the conductor eddy current loss of each turn of the conductor in the transformer coil is accumulated to obtain the coil eddy current loss of the transformer coil.
[0046] In some embodiments, the eddy current loss of each turn of conductor includes transverse eddy current loss and longitudinal eddy current loss, and the sum of the transverse eddy current loss and longitudinal eddy current loss is the conductor eddy current loss of that turn of conductor. A transformer coil contains multiple turns of conductor, and by accumulating the eddy current losses of each turn of conductor, the coil eddy current loss of the transformer coil can be obtained.
[0047] The transformer coil was simulated using a transformer coil simulation model to obtain the magnetic flux density distribution outside and inside the window for each turn of the conductor. The magnetic flux density distribution inside the window reflects the influence of the yoke on the magnetic field of the transformer coil. By combining the magnetic flux density distribution outside and inside the window, and considering the length covered and uncovered by the yoke, the transverse and longitudinal eddy current losses for each turn of the conductor were obtained, ensuring the accuracy of the calculation of transverse and longitudinal eddy current losses. This further ensures the accuracy of the coil eddy current loss calculation. Since the influence of the yoke was considered in both the transverse and longitudinal eddy current losses during the calculation, the calculated coil eddy current loss also takes into account the influence of the yoke on the magnetic flux density distribution, improving the accuracy of the coil eddy current loss calculation.
[0048] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
[0049] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.
[0050] Figure 10 A schematic diagram of the coil eddy current loss calculation device based on model simulation provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below: like Figure 10 As shown, the coil eddy current loss calculation device 10 based on model simulation includes: The simulation module 101 is used to perform simulation calculations on the transformer coil based on a pre-built transformer coil simulation model, to obtain the magnetic flux density distribution outside and inside the window of each turn of the conductor in the transformer coil; wherein, the transformer coil simulation model includes the transformer coil, the iron core column, and the iron yoke; the window is a window composed of the iron core column and the iron yoke; in the end region of the transformer coil, the transverse magnetic density in the magnetic flux density distribution outside the window is greater than the transverse magnetic density in the magnetic flux density distribution inside the window, and the longitudinal magnetic density in the magnetic flux density distribution outside the window is less than the longitudinal magnetic density in the magnetic flux density distribution inside the window; The determination module 102 is used to determine the transverse eddy current loss and longitudinal eddy current loss of each turn of conductor based on the corresponding external magnetic flux density distribution, internal magnetic flux density distribution and yoke coverage length of the conductor. The calculation module 103 is used to calculate the coil eddy current loss of the transformer coil based on the transverse eddy current loss and the longitudinal eddy current loss of each turn of the conductor.
[0051] In one possible implementation, the simulation module 101 specifically includes: performing simulation calculations on the transformer coil according to the transformer coil simulation model to obtain the overall magnetic flux density distribution of the transformer coil; determining the first position coordinates and the second position coordinates of each turn of wire according to the position of each turn of wire in the transformer coil; and obtaining the external magnetic flux density distribution and the internal magnetic flux density distribution of each turn of wire in the transformer coil based on the first position coordinates, the second position coordinates, and the overall magnetic flux density distribution.
[0052] In one possible implementation, the simulation module 101 further includes: determining the abscissa of each turn of wire based on the radius of the transformer coil and the position of each turn of wire in the transformer coil; calculating the first ordinate of each turn of wire based on the position of each turn of wire in the transformer coil; obtaining the first position coordinate of each turn of wire based on the abscissa and the first ordinate of each turn of wire; determining the position difference between the first position coordinate and the second position coordinate of each turn of wire based on the transformer coil simulation model; and calculating the second position coordinate of each turn of wire based on the first position coordinate and the position difference.
[0053] In one possible implementation, the simulation module 101 further includes: extracting the external magnetic flux density distribution of the conductor corresponding to the first position coordinate at the corresponding position of the overall magnetic flux density distribution based on the first position coordinate of each turn of the conductor; and extracting the internal magnetic flux density distribution of the conductor corresponding to the second position coordinate at the corresponding position of the overall magnetic flux density distribution based on the second position coordinate of each turn of the conductor.
[0054] In one possible implementation, the determining module 102 specifically includes: for each turn of conductor, performing the following steps: obtaining the transverse magnetic density and longitudinal magnetic density outside the window of the conductor based on the corresponding external magnetic flux density distribution of the conductor; obtaining the transverse magnetic density and longitudinal magnetic density inside the window of the conductor based on the corresponding internal magnetic flux density distribution of the conductor; and calculating the transverse eddy current loss and longitudinal eddy current loss of the conductor based on the external transverse magnetic density, external longitudinal magnetic density, internal transverse magnetic density, internal longitudinal magnetic density and yoke coverage length.
[0055] In one possible implementation, the determining module 102 further includes: calculating the yoke-covered length of the conductor, and calculating the yoke-uncovered length of the conductor based on the total length of the conductor and the yoke-covered length; calculating the transverse eddy current loss of the conductor based on the yoke-covered length, the yoke-uncovered length, the transverse magnetic density outside the window, and the transverse magnetic density inside the window; and calculating the longitudinal eddy current loss of the conductor based on the yoke-covered length, the yoke-uncovered length, the longitudinal magnetic density outside the window, and the longitudinal magnetic density inside the window.
[0056] In one possible implementation, the calculation module 103 specifically includes: adding the transverse eddy current loss and the longitudinal eddy current loss of each turn of the conductor to obtain the conductor eddy current loss of each turn of the conductor; and accumulating the conductor eddy current loss of each turn of the conductor in the transformer coil to obtain the coil eddy current loss of the transformer coil.
[0057] In one possible implementation, the calculation module 103 further includes: determining the number of core columns in the transformer, and multiplying the eddy current loss of the transformer coil by the number of core columns to obtain the eddy current loss of the transformer.
[0058] Figure 11 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. For example... Figure 11 As shown, the electronic device 11 of this embodiment includes a processor 1110 and a memory 1111. The memory 1111 stores a computer program 1112. When the processor 1110 executes the computer program 1112, it implements the steps in the various method embodiments described above. Alternatively, when the processor 1110 executes the computer program 1112, it implements the functions of each module / unit in the various device embodiments described above.
[0059] For example, computer program 1112 may be divided into one or more modules / units, which are stored in memory 1111 and executed by processor 1110 to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 1112 in electronic device 11.
[0060] Electronic device 11 may include, but is not limited to, processor 1110 and memory 1111. Those skilled in the art will understand that... Figure 11 This is merely an example of electronic device 11 and does not constitute a limitation on electronic device 11. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device 11 may also include input / output devices, network access devices, buses, etc.
[0061] The processor 1110 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.
[0062] The memory 1111 can be an internal storage unit of the electronic device 11, such as a hard disk or RAM of the electronic device 11. The memory 1111 can also be an external storage device of the electronic device 11, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or FlashCard equipped on the electronic device 11. Furthermore, the memory 1111 can include both internal and external storage units of the electronic device 11. The memory 1111 is used to store the computer program 1112 and other programs and data required by the electronic device 11. The memory 1111 can also be used to temporarily store data that has been output or will be output.
[0063] For the sake of simplicity and clarity, only the above-described functional modules / units are used as examples. In practical applications, the functions described above can be assigned to different functional modules / units as needed. These modules / units can be implemented in hardware, software, or a combination of both.
[0064] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not detailed or described in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Unless otherwise specified or in conflict with logic, the terminology and / or descriptions between different embodiments are consistent and can be referenced interchangeably. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.
[0065] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.
Claims
1. A method for calculating coil eddy current losses based on model simulation, characterized in that, include: Based on a pre-constructed transformer coil simulation model, simulation calculations are performed on the transformer coil to obtain the magnetic flux density distribution outside and inside the window for each turn of the conductor in the transformer coil. The transformer coil simulation model includes the transformer coil, core column, and yoke. The window is a window formed by the core column and the yoke. In the end region of the transformer coil, the transverse magnetic density in the external magnetic flux density distribution is greater than the transverse magnetic density in the inside magnetic flux density distribution, and the longitudinal magnetic density in the external magnetic flux density distribution is less than the longitudinal magnetic density in the inside magnetic flux density distribution. For each turn of conductor, based on the corresponding magnetic flux density distribution outside the window, magnetic flux density distribution inside the window, and yoke coverage length, the transverse eddy current loss and longitudinal eddy current loss of the conductor are obtained. The coil eddy current loss of the transformer coil is calculated based on the transverse eddy current loss and the longitudinal eddy current loss of each turn of the conductor.
2. The method for calculating coil eddy current loss based on model simulation according to claim 1, characterized in that, For each turn of the conductor, based on the corresponding external magnetic flux density distribution, internal magnetic flux density distribution, and yoke coverage length, the transverse eddy current loss and longitudinal eddy current loss of the conductor are obtained, including: For each turn of the conductor, perform the following steps: Based on the corresponding magnetic flux density distribution outside the window of the conductor, the transverse magnetic flux density and the longitudinal magnetic flux density outside the window of the conductor are obtained. Based on the corresponding magnetic flux density distribution within the window of the conductor, the transverse magnetic flux density and the longitudinal magnetic flux density within the window of the conductor are obtained. Based on the transverse magnetic density outside the window, the longitudinal magnetic density outside the window, the transverse magnetic density inside the window, the longitudinal magnetic density inside the window, and the yoke coverage length, calculate the transverse eddy current loss and the longitudinal eddy current loss of the conductor.
3. The method for calculating coil eddy current loss based on model simulation according to claim 2, characterized in that, The calculation of the transverse eddy current loss and longitudinal eddy current loss of the conductor based on the transverse magnetic density outside the window, the longitudinal magnetic density outside the window, the transverse magnetic density inside the window, the longitudinal magnetic density inside the window, and the yoke coverage length includes: Calculate the yoke-covered length of the conductor, and based on the total length of the conductor and the yoke-covered length, calculate the yoke-uncovered length of the conductor. Based on the yoke coverage length, the yoke uncovered length, the transverse magnetic density outside the window, and the transverse magnetic density inside the window, the transverse eddy current loss of the conductor is calculated. Based on the yoke coverage length, the yoke uncovered length, the longitudinal magnetic density outside the window, and the longitudinal magnetic density inside the window, the longitudinal eddy current loss of the conductor is calculated.
4. The method for calculating coil eddy current loss based on model simulation according to claim 1, characterized in that, The step of performing simulation calculations on the transformer coil based on the transformer coil simulation model to obtain the magnetic flux density distribution outside and inside the window of each turn of the conductor in the transformer coil includes: Based on the transformer coil simulation model, the overall magnetic flux density distribution of the transformer coil is obtained through simulation calculation. Based on the position of each turn of wire in the transformer coil, determine the first position coordinates and the second position coordinates of each turn of wire; Based on the first position coordinates, the second position coordinates, and the overall magnetic flux density distribution, the magnetic flux density distribution outside the window and the magnetic flux density distribution inside the window of each turn of the conductor in the transformer coil are obtained.
5. The method for calculating coil eddy current loss based on model simulation according to claim 4, characterized in that, The step of determining the first position coordinates and the second position coordinates of each turn of wire based on its position in the transformer coil includes: Based on the radius of the transformer coil and the position of each turn of wire in the transformer coil, determine the abscissa of each turn of wire, and calculate the first ordinate of each turn of wire based on the position of each turn of wire in the transformer coil. Based on the x-coordinate of each turn of the conductor and the first y-coordinate of each turn of the conductor, the first position coordinates of each turn of the conductor are obtained; Based on the transformer coil simulation model, the position difference between the first and second position coordinates of each turn of conductor is determined. The second position coordinates of each turn of conductor are calculated based on the first position coordinates of each turn and the position difference.
6. The method for calculating coil eddy current loss based on model simulation according to claim 4, characterized in that, Based on the first position coordinates, the second position coordinates, and the overall magnetic flux density distribution, the external magnetic flux density distribution and the internal magnetic flux density distribution of each turn of the conductor in the transformer coil are obtained, including: Based on the first position coordinates of each turn of the conductor, the external magnetic flux density distribution of the conductor corresponding to the first position coordinates is extracted at the corresponding position of the overall magnetic flux density distribution. Based on the second position coordinates of each turn of the conductor, the in-window magnetic flux density distribution of the conductor corresponding to the second position coordinates is extracted at the corresponding position of the overall magnetic flux density distribution.
7. The method for calculating coil eddy current loss based on model simulation according to claim 1, characterized in that, The calculation of the eddy current loss of the transformer coil based on the transverse and longitudinal eddy current losses of each turn of conductor includes: The transverse eddy current loss and longitudinal eddy current loss of each turn of conductor are added together to obtain the conductor eddy current loss of each turn of conductor. The coil eddy current loss of the transformer coil is obtained by summing up the eddy current losses of each turn of the conductor in the transformer coil.
8. The method for calculating coil eddy current loss based on model simulation according to claim 1, characterized in that, The method further includes: Determine the number of core columns in the transformer, and multiply the eddy current loss of the transformer coil by the number of core columns to obtain the eddy current loss of the transformer.
9. A coil eddy current loss calculation device based on model simulation, characterized in that, include: The simulation module is used to perform simulation calculations on the transformer coil based on a pre-constructed transformer coil simulation model, to obtain the external magnetic flux density distribution and the internal magnetic flux density distribution of each turn of the conductor in the transformer coil; wherein, the transformer coil simulation model includes the transformer coil, the core column, and the yoke; the window is a window formed by the core column and the yoke; in the end region of the transformer coil, the transverse magnetic flux density in the external magnetic flux density distribution is greater than the transverse magnetic flux density in the internal magnetic flux density distribution, and the longitudinal magnetic flux density in the external magnetic flux density distribution is less than the longitudinal magnetic flux density in the internal magnetic flux density distribution; The determination module is used to determine the transverse eddy current loss and longitudinal eddy current loss of each turn of conductor based on the corresponding external magnetic flux density distribution, internal magnetic flux density distribution and yoke coverage length of the conductor. The calculation module is used to calculate the coil eddy current loss of the transformer coil based on the transverse eddy current loss and the longitudinal eddy current loss of each turn of the conductor.
10. An electronic device, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method as described in any one of claims 1 to 8.