Selection method of magnetic ring on AC wire harness in electric drive system and electric drive system

Abstract

The present application discloses a method for selecting a magnetic ring on an AC wire harness in an electric drive system and an electric drive system, and relates to the technical field of new energy vehicles. The method comprises: obtaining the size parameters of the AC wire harness in the electric drive system; determining a second magnetic ring model that matches the size of the AC wire harness from a first magnetic ring model based on the size parameters, wherein the first magnetic ring model has the characteristics of small magnetic permeability at low frequencies and large magnetic permeability at high frequencies; and selecting a magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns from the second magnetic ring models as the target magnetic ring model.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and in particular to a method for selecting a magnetic ring on an AC wiring harness in an electric drive system and an electric drive system. Background Art

[0002] With the development of new energy vehicles, the electromagnetic compatibility of electric vehicles is becoming increasingly important in vehicle safety, and the electromagnetic compatibility of electric drive systems is the main aspect affecting the electromagnetic compatibility of electric vehicles. Silicon carbide high-performance electric drive system is an electric drive system that uses silicon carbide (SiC) material as a key component. It has been widely used in many fields with its high efficiency, reliability, and easy maintenance, especially in new energy vehicles, power tools, aerospace and other fields. Silicon carbide high-performance electric drive system mainly consists of three parts: motor, controller and reducer. These three parts have achieved higher integration and performance with the support of silicon carbide technology. Among them, the motor can be a permanent magnet synchronous motor or an asynchronous induction motor, the controller is designed using devices such as silicon carbide MOSFET, and the reducer is matched according to specific needs. Due to the complex working environment of the electric drive system of electric vehicles, it needs to face various electromagnetic interferences from the vehicle itself and the outside. Therefore, in the design of the silicon carbide motor drive system, the electromagnetic compatibility issue must be fully considered. Reduce the electromagnetic noise level of the system and improve the electromagnetic compatibility performance of the system, so as to ensure that the electric vehicle can operate stably under various working conditions. And shaft current noise is a typical noise mode of the electric drive system.

[0003] At present, the controllers of most electric drive systems are directly integrated with the motor, eliminating the external AC harness and resolver harness, which reduces the electromagnetic noise level of the AC harness and resolver harness to a certain extent. However, the AC harness and resolver harness still need to be connected to the controller inside the motor. The AC harness is mainly used to provide electrical energy for the motor to work, and has a very high electromagnetic noise level. Since it is located inside the motor and controller, the electromagnetic noise in its space can be effectively shielded by the motor and controller housing. However, the AC+ harness can couple the electromagnetic noise to the motor half-shaft and radiate it outward, causing the electromagnetic noise level of the electric drive system to deteriorate. Summary of the invention

[0004] The purpose of the present application is to provide a method for selecting a magnetic ring on an AC wiring harness in an electric drive system and an electric drive system.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a method for selecting a magnetic ring on an AC wiring harness in an electric drive system, comprising:

[0007] Obtain the size parameters of the AC wire harness in the electric drive system;

[0008] Determine a second magnetic ring model adapted to the size of the AC wire harness from the first magnetic ring model based on the size parameter, wherein the first magnetic ring model has the characteristics of low magnetic permeability at low frequency and large magnetic permeability at high frequency;

[0009] Among the second magnetic ring models, the magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns is selected as the target magnetic ring model.

[0010] Optionally, the step of selecting a magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns from the second magnetic ring models as the target magnetic ring model includes:

[0011] Calculate the cross-sectional area of ​​the magnetic ring according to the outer diameter, inner diameter and height of the magnetic ring of the second magnetic ring model;

[0012] Determine a third magnetic ring model whose magnetic ring cross-sectional area reaches a magnetic ring cross-sectional area threshold;

[0013] A magnetic ring model with the smallest number of magnetic ring turns is selected from the third magnetic ring models as the target magnetic ring model.

[0014] Optionally, after the step of selecting the magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns from the second magnetic ring models as the target magnetic ring model, the method further includes:

[0015] For an electric drive system without a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-shaft to obtain first conducted electromagnetic noise test data;

[0016] For an electric drive system equipped with a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-shaft to obtain second conducted electromagnetic noise test data;

[0017] The first conducted electromagnetic noise test data and the second conducted electromagnetic noise test data are compared to obtain a conducted noise reduction result corresponding to the target magnetic ring model.

[0018] Optionally, after the step of selecting the magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns from the second magnetic ring models as the target magnetic ring model, the method further includes:

[0019] For an electric drive system without a magnetic ring of the target magnetic ring model, a radiated electromagnetic noise test is performed in a high-frequency environment to obtain first high-frequency radiated electromagnetic noise test data;

[0020] For an electric drive system equipped with a magnetic ring of the target magnetic ring model, a radiation electromagnetic noise test is performed in a high-frequency environment to obtain second high-frequency radiation electromagnetic noise test data;

[0021] The first high-frequency radiation electromagnetic noise test data and the second high-frequency radiation electromagnetic noise test data are compared to obtain a high-frequency radiation noise result corresponding to the target magnetic ring model.

[0022] Optionally, the size parameters include at least: the diameter of the AC wire harness and the size of the AC wire harness cavity.

[0023] In a second aspect, the present application provides a device for selecting a magnetic ring on an AC wire harness in an electric drive system, comprising:

[0024] An acquisition module, used for acquiring dimension parameters of an AC wire harness in an electric drive system;

[0025] A processing module, configured to determine a second magnetic ring model adapted to the size of the AC wire harness from the first magnetic ring model based on the size parameter, wherein the first magnetic ring model has the characteristics of low magnetic permeability at low frequency and high magnetic permeability at high frequency;

[0026] Among the second magnetic ring models, the magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns is selected as the target magnetic ring model.

[0027] Optionally, the processing module is further used to:

[0028] Calculate the cross-sectional area of ​​the magnetic ring according to the outer diameter, inner diameter and height of the magnetic ring of the second magnetic ring model;

[0029] Determine a third magnetic ring model whose magnetic ring cross-sectional area reaches a magnetic ring cross-sectional area threshold;

[0030] A magnetic ring model with the smallest number of magnetic ring turns is selected from the third magnetic ring models as the target magnetic ring model.

[0031] Optionally, the processing module is further used to:

[0032] For an electric drive system without a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-shaft to obtain first conducted electromagnetic noise test data;

[0033] For an electric drive system equipped with a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-shaft to obtain second conducted electromagnetic noise test data;

[0034] The first conducted electromagnetic noise test data and the second conducted electromagnetic noise test data are compared to obtain a conducted noise reduction result corresponding to the target magnetic ring model.

[0035] Optionally, the processing module is further used to:

[0036] For an electric drive system without a magnetic ring of the target magnetic ring model, a radiated electromagnetic noise test is performed in a high-frequency environment to obtain first high-frequency radiated electromagnetic noise test data;

[0037] For an electric drive system equipped with a magnetic ring of the target magnetic ring model, a radiation electromagnetic noise test is performed in a high-frequency environment to obtain second high-frequency radiation electromagnetic noise test data;

[0038] The first high-frequency radiation electromagnetic noise test data and the second high-frequency radiation electromagnetic noise test data are compared to obtain a high-frequency radiation noise result corresponding to the target magnetic ring model.

[0039] Optionally, the size parameters include at least: the diameter of the AC wire harness and the size of the AC wire harness cavity.

[0040] In a third aspect, the present application provides an electric drive system, characterized in that the electric drive system comprises at least: an AC power harness equipped with a magnetic ring, and the target magnetic ring model of the magnetic ring is determined by the selection method of the magnetic ring on the AC power harness in the electric drive system described in any one of the above-mentioned methods.

[0041] In a fourth aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for selecting a magnetic ring on an AC wiring harness in an electric drive system as described above.

[0042] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for selecting a magnetic ring on an AC wiring harness in an electric drive system as described in any one of the above.

[0043] In a sixth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the method for selecting a magnetic ring on an AC wiring harness in an electric drive system as described above.

[0044] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0045] The present application provides a method for selecting a magnetic ring on an AC wire harness in an electric drive system and an electric drive system. By selecting a magnetic ring model with low low-frequency small magnetic permeability, high high-frequency large magnetic permeability, the largest magnetic ring cross-sectional area, and the smallest number of magnetic ring turns for the AC wire harness based on the size parameters of the AC wire harness, the magnetic ring installed on the AC wire harness can achieve the best effect in suppressing electromagnetic noise, ensuring that the magnetic ring plays a good filtering effect on the AC wire harness at different frequencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 A schematic diagram of the structure of an electric drive system provided in one embodiment of the present application;

[0048] Figure 2 A schematic diagram of a flow chart of a method for selecting a magnetic ring on an AC wire harness in an electric drive system provided in one embodiment of the present application;

[0049] Figure 3 This is one of the effect schematic diagrams of a method for selecting a magnetic ring on an AC wire harness in an electric drive system provided by an embodiment of the present application;

[0050] Figure 4 A second schematic diagram of the effect of a method for selecting a magnetic ring on an AC wire harness in an electric drive system provided by an embodiment of the present application;

[0051] Figure 5 A third schematic diagram of the effect of a method for selecting a magnetic ring on an AC wire harness in an electric drive system provided by an embodiment of the present application;

[0052] Figure 6 A fourth effect schematic diagram of a method for selecting a magnetic ring on an AC wire harness in an electric drive system provided by an embodiment of the present application;

[0053] Figure 7 A fifth effect schematic diagram of a method for selecting a magnetic ring on an AC wire harness in an electric drive system provided by an embodiment of the present application;

[0054] Figure 8 A sixth schematic diagram of the effect of a method for selecting a magnetic ring on an AC wire harness in an electric drive system provided by an embodiment of the present application;

[0055] Fig. 9 A schematic diagram of the functional modules of a device for selecting a magnetic ring on an AC wire harness in an electric drive system provided by one embodiment of the present application;

[0056] Fig.10 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] like Figure 1 As shown, some embodiments of the present application provide an electric drive system, which comprises at least: an AC power harness 1 equipped with a magnetic ring 2, wherein the target magnetic ring model of the magnetic ring is determined by a method for selecting the magnetic ring on the AC power harness in the electric drive system provided in an embodiment of the present application.

[0059] In the embodiment of the present application, the AC harness is a cable bundle or wire group used to transmit AC power in the electric drive system of an electric vehicle. It is mainly composed of multiple wires, an insulation layer, a shielding layer (if necessary) and a sheath, and is used to connect various components of the electric drive system, such as a motor, a controller and a power supply.

[0060] The embodiment of the present application reduces the electromagnetic noise level of the AC power harness by adopting a filtering method of adding a magnetic ring to the AC power harness, so that the electromagnetic noise of the AC power harness is consumed by the magnetic ring, thereby reducing the electromagnetic noise coupled to the motor half shaft, so that the electric drive system can achieve better electromagnetic compatibility.

[0061] Furthermore, the selection of the magnetic ring will also affect the filtering effect of the magnetic ring on the AC wire harness. The following will explain how to select the magnetic ring based on the selection method of the magnetic ring on the AC wire harness in the electric drive system provided in some embodiments of the present application.

[0062] like Figure 2 As shown, some embodiments of the present application provide a method for selecting a magnetic ring on an AC wire harness in an electric drive system. In the embodiment of the present application, the method includes the following steps 101 to 103. Among them:

[0063] Step 101, obtaining the dimension parameters of the AC wire harness in the electric drive system.

[0064] In the embodiment of the present application, in the electric drive system, the size parameters of the AC wire harness (AC wire harness) are crucial for selecting a suitable magnetic ring. These size parameters may include the diameter and length of the wire harness, and the size of the cavity in which the wire harness is located, etc., which can be set according to actual needs and are not limited here. These parameters are obtained to ensure that the selected magnetic ring can be tightly sleeved on the wire harness, and at the same time, its filtering effect or installation convenience will not be affected due to size mismatch.

[0065] Step 102: determining a second magnetic ring model that matches the size of the AC wire harness from the first magnetic ring model based on the size parameter, wherein the first magnetic ring model has the characteristics of small magnetic permeability at low frequency and large magnetic permeability at high frequency.

[0066] In the embodiment of the present application, after the size parameters of the AC wire harness are determined, it is necessary to select a magnetic ring model (i.e., the second magnetic ring model) that matches the size of the AC wire harness from a preset magnetic ring model set (i.e., the first magnetic ring model). This ensures that the selected magnetic ring model matches the AC wire harness in physical size and can be tightly mounted on the wire harness, thereby effectively exerting its filtering effect.

[0067] Refer to the following formula (1) for the calculation formula of the magnetic ring inductance:

[0068] (1)

[0069] Among them, μ is the magnetic permeability of the magnetic ring, N is the number of turns of the magnetic ring, A is the cross-sectional area of ​​the magnetic ring, and c is the magnetic path length of the magnetic ring. Because the AC harness current is large, it will lead to a large bias current. In order to ensure that the magnetic ring is not saturated, a smaller magnetic permeability should be selected. However, it can be seen from formula (1) that a small magnetic permeability will reduce the inductance of the magnetic ring, and a small inductance will reduce the inductive reactance of the magnetic ring and affect the suppression effect of the magnetic ring. Therefore, in order to better suppress the high-frequency shaft current noise near 15MHz-45MHz, it is necessary to select a magnetic ring with small magnetic permeability at low frequency, large magnetic permeability at high frequency, and large inductance and reactance at high frequency.

[0070] Since both low-frequency and high-frequency electromagnetic noise may exist in the electric drive system, the magnetic ring needs to have a good filtering effect at different frequencies. Low-frequency and low-permeability help suppress low-frequency noise, while high-frequency and high-permeability help suppress high-frequency noise. Magnetic rings with this characteristic can better adapt to the complex electromagnetic environment of the electric drive system.

[0071] Step 103: Select a magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns from the second magnetic ring models as a target magnetic ring model.

[0072] In the embodiment of the present application, after determining the second magnetic ring model that is compatible with the AC harness size, it is necessary to further select the optimal magnetic ring model from these models as the target magnetic ring model.

[0073] The following formula (2) is the calculation formula for the cross-sectional area of ​​the magnetic ring:

[0074] (2)

[0075] The following formula (3) is the calculation formula for the magnetic circuit length of the magnetic ring:

[0076] (3)

[0077] The larger the cross-sectional area of ​​the magnetic ring, the larger the outer diameter D of the magnetic ring and the smaller the inner diameter d of the magnetic ring. This can be seen from equations (2) and (3), which can increase the cross-sectional area A of the magnetic ring and reduce the magnetic circuit length c of the magnetic ring. Its inductance is usually larger, which helps to enhance the filtering effect. The fewer the number of turns of the magnetic ring, the better the suppression effect on high-frequency interference. Therefore, selecting the magnetic ring model with the largest cross-sectional area and the smallest number of turns as the target magnetic ring model can ensure the best effect in suppressing electromagnetic noise.

[0078] The embodiment of the present application selects a magnetic ring model with small magnetic permeability at low frequency, large magnetic permeability at high frequency, the largest magnetic ring cross-sectional area, and the smallest number of magnetic ring turns for the AC wire harness based on the size parameters of the AC wire harness, so that the magnetic ring installed on the AC wire harness can achieve the best effect in suppressing electromagnetic noise, ensuring that the magnetic ring plays a good filtering effect for the AC wire harness at different frequencies.

[0079] Optionally, the step 103 includes:

[0080] Step 1031, calculating the cross-sectional area of ​​the magnetic ring according to the outer diameter, inner diameter and height of the magnetic ring of the second magnetic ring model.

[0081] In the embodiment of the present application, the calculation method of the cross-sectional area of ​​the magnetic ring can refer to the above formula (2), and the cross-sectional area of ​​the magnetic ring can be calculated using the above formula or a similar formula based on the outer diameter, inner diameter and height of the magnetic ring provided by the second magnetic ring model.

[0082] Step 1032, determining a third magnetic ring model whose magnetic ring cross-sectional area reaches a magnetic ring cross-sectional area threshold.

[0083] In the embodiment of the present application, after obtaining the cross-sectional areas of multiple magnetic ring models, a cross-sectional area threshold needs to be determined. This threshold is set according to the specific requirements of the electric drive system and the electromagnetic noise suppression effect. Then, the magnetic ring models whose cross-sectional areas reach or exceed this threshold are screened out from the second magnetic ring models as candidate third magnetic ring models.

[0084] Step 1033: Select a magnetic ring model with the smallest number of magnetic ring turns from the third magnetic ring models as a target magnetic ring model.

[0085] In the embodiment of the present application, after determining the candidate third magnetic ring model, the optimal magnetic ring model needs to be selected from these models as the target magnetic ring model. As mentioned above, the fewer the number of magnetic ring turns, the better the suppression effect on high-frequency interference. Therefore, the magnetic ring model with the smallest number of magnetic ring turns will be selected as the target magnetic ring model.

[0086] The embodiment of the present application can ensure that the selected magnetic ring achieves the best effect in suppressing electromagnetic noise by calculating the cross-sectional area of ​​the magnetic ring, screening the magnetic ring model according to the cross-sectional area threshold, and selecting the best magnetic ring model from the screened models as the target magnetic ring model.

[0087] Optionally, after step 103, the method further includes:

[0088] Step 201 , for an electric drive system without a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-axis to obtain first conducted electromagnetic noise test data.

[0089] In an embodiment of the present application, ensure that the electric drive system is in a state where the target magnetic ring model magnetic ring is not installed, that is, no magnetic ring filtering device is installed on the AC wiring harness. Use electromagnetic noise testing equipment to test the conducted electromagnetic noise on the motor half shaft. This test usually needs to be performed under certain working conditions to simulate the actual operating state of the electric drive system. The data obtained during the test is recorded as the first conducted electromagnetic noise test data. These data reflect the level of conducted electromagnetic noise on the motor half shaft when the magnetic ring is not installed.

[0090] Step 202 , for the electric drive system equipped with the magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on the motor half-shaft to obtain second conducted electromagnetic noise test data.

[0091] In an embodiment of the present application, a magnetic ring of the target magnetic ring model is installed on the AC harness of the electric drive system to ensure that the magnetic ring is correctly installed and meets the design requirements. The conducted electromagnetic noise on the motor half shaft is also tested using electromagnetic noise testing equipment. The test conditions should be the same as in the previous step to ensure the comparability of the test results. The data obtained during the test after the magnetic ring is installed is recorded as the second conducted electromagnetic noise test data. These data reflect the level of conducted electromagnetic noise on the motor half shaft after the magnetic ring is installed.

[0092] Step 203: Compare the first conducted electromagnetic noise test data with the second conducted electromagnetic noise test data to obtain a conducted noise reduction result corresponding to the target magnetic ring model.

[0093] In an embodiment of the present application, the first conducted electromagnetic noise test data and the second conducted electromagnetic noise test data obtained are compared. The content of the comparison generally includes indicators such as the noise amplitude and the total noise level at different frequencies. Based on the comparison results, the noise reduction amount or noise reduction percentage of the target magnetic ring model on the conducted electromagnetic noise is calculated. This calculation process can select appropriate calculation methods and formulas according to actual needs. The suppression effect of the target magnetic ring model is evaluated based on the noise reduction results. If the noise reduction effect is significant, it indicates that the magnetic ring model is suitable for the electromagnetic noise suppression of the electric drive system; if the noise reduction effect is not ideal, it may be necessary to reselect the magnetic ring model or adjust parameters such as the installation position.

[0094] Reference Figure 3 It is the conducted electromagnetic noise on the motor half shaft when no magnetic ring filter is added to the AC harness. Figure 4 This is the conducted electromagnetic noise on the motor half shaft when a magnetic ring filter is added to the AC wiring harness. It can be seen that adding a magnetic ring filter to the AC wiring harness can effectively reduce the conducted electromagnetic noise on the motor half shaft near 10MHz-50MHz.

[0095] Optionally, after step 103, the method further includes:

[0096] Step 301 , performing a radiated electromagnetic noise test in a high-frequency environment on an electric drive system without a magnetic ring of the target magnetic ring model, and obtaining first high-frequency radiated electromagnetic noise test data.

[0097] In an embodiment of the present application, ensure that the electric drive system is in a state where the target magnetic ring model magnetic ring is not installed, that is, no magnetic ring filtering device is installed on the AC harness. At the same time, a test environment is set to simulate a high-frequency electromagnetic field environment, which usually requires the use of special test equipment or facilities to generate high-frequency electromagnetic radiation. In a high-frequency environment, a radiated electromagnetic noise test device is used to test the radiated electromagnetic noise of the electric drive system. The test should cover a predetermined frequency range to comprehensively evaluate the radiated electromagnetic noise characteristics of the system. The data obtained during the test is recorded as the first high-frequency radiated electromagnetic noise test data. These data reflect the radiated electromagnetic noise level of the electric drive system in a high-frequency environment when no magnetic ring is installed.

[0098] Step 302 , performing a radiated electromagnetic noise test in a high-frequency environment on an electric drive system equipped with a magnetic ring of the target magnetic ring model, and obtaining second high-frequency radiated electromagnetic noise test data.

[0099] In an embodiment of the present application, a magnetic ring of the target magnetic ring model is installed on the AC harness of the electric drive system, and it is ensured that the magnetic ring is correctly installed and meets the design requirements. Then, the test environment is also set up to simulate the high-frequency electromagnetic field environment. In a high-frequency environment, the radiated electromagnetic noise of the electric drive system after the magnetic ring is installed is tested using the same radiated electromagnetic noise test equipment. The test conditions should be the same as in the previous step to ensure the comparability of the test results. The data obtained during the test after the magnetic ring is installed is recorded as the second high-frequency radiated electromagnetic noise test data. These data reflect the radiated electromagnetic noise level of the electric drive system in a high-frequency environment after the magnetic ring is installed.

[0100] Step 303: Compare the first high-frequency radiation electromagnetic noise test data with the second high-frequency radiation electromagnetic noise test data to obtain a high-frequency radiation noise result corresponding to the target magnetic ring model.

[0101] In an embodiment of the present application, the obtained first high-frequency radiation electromagnetic noise test data and the second high-frequency radiation electromagnetic noise test data are compared. The content of the comparison generally includes indicators such as the radiation noise amplitude and the total radiation noise level at different frequencies. Through the comparison results, the noise reduction amount or noise reduction percentage of the target magnetic ring model on the high-frequency radiation electromagnetic noise is calculated. This calculation process can select appropriate calculation methods and formulas according to actual needs. According to the noise reduction results, the radiation electromagnetic noise suppression effect of the target magnetic ring model in a high-frequency environment is evaluated. If the noise reduction effect is significant, it indicates that the magnetic ring model is suitable for the electromagnetic noise suppression of the electric drive system in a high-frequency environment; if the noise reduction effect is not ideal, it may be necessary to reselect the magnetic ring model or adjust parameters such as the installation position.

[0102] Reference Figure 5 This is the radiated electromagnetic noise of the 150kHz-30MHz electric drive system without adding magnetic ring filtering to the AC harness. Figure 6 This is the radiated electromagnetic noise of the 150kHz-30MHz electric drive system when a magnetic ring filter is added to the AC wiring harness. It can be seen that adding a magnetic ring filter to the AC wiring harness can reduce the conducted electromagnetic noise on the motor half shaft near 10MHz-50MHz.

[0103] Reference Figure 7 This is the radiated electromagnetic noise of the 30MHz-200MHz electric drive system without adding magnetic ring filtering to the AC harness. Figure 8 This is the radiated electromagnetic noise of the 30MHz-200MHz electric drive system when a magnetic ring filter is added to the AC harness. It can be seen that adding a magnetic ring filter to the AC harness can effectively reduce the radiated electromagnetic noise of the electric drive system near 10MHz-50MHz.

[0104] Optionally, the size parameters include at least: the diameter of the AC wire harness and the size of the AC wire harness cavity.

[0105] Based on the same inventive concept, the embodiment of the present application also provides a device for selecting a magnetic ring on an AC wire harness in an electric drive system for implementing the method for selecting a magnetic ring on an AC wire harness in an electric drive system involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of one or more devices for selecting a magnetic ring on an AC wire harness in an electric drive system provided below can be referred to the limitations of the method for selecting a magnetic ring on an AC wire harness in an electric drive system above, and will not be repeated here.

[0106] In an exemplary embodiment, Fig. 9 As shown, a device 40 for selecting a magnetic ring on an AC wire harness in an electric drive system is provided, comprising:

[0107] An acquisition module 401 is used to acquire the size parameters of the AC wire harness in the electric drive system;

[0108] A processing module 402 is used to determine a second magnetic ring model that is adapted to the size of the AC wire harness from the first magnetic ring model based on the size parameter, wherein the first magnetic ring model has the characteristics of low magnetic permeability at low frequency and high magnetic permeability at high frequency;

[0109] Among the second magnetic ring models, the magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns is selected as the target magnetic ring model.

[0110] Optionally, the processing module 402 is further configured to:

[0111] Calculate the cross-sectional area of ​​the magnetic ring according to the outer diameter, inner diameter and height of the magnetic ring of the second magnetic ring model;

[0112] Determine a third magnetic ring model whose magnetic ring cross-sectional area reaches a magnetic ring cross-sectional area threshold;

[0113] A magnetic ring model with the smallest number of magnetic ring turns is selected from the third magnetic ring models as the target magnetic ring model.

[0114] Optionally, the processing module 402 is further configured to:

[0115] For an electric drive system without a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-shaft to obtain first conducted electromagnetic noise test data;

[0116] For an electric drive system equipped with a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-shaft to obtain second conducted electromagnetic noise test data;

[0117] The first conducted electromagnetic noise test data and the second conducted electromagnetic noise test data are compared to obtain a conducted noise reduction result corresponding to the target magnetic ring model.

[0118] Optionally, the processing module 402 is further configured to:

[0119] For an electric drive system without a magnetic ring of the target magnetic ring model, a radiated electromagnetic noise test is performed in a high-frequency environment to obtain first high-frequency radiated electromagnetic noise test data;

[0120] For an electric drive system equipped with a magnetic ring of the target magnetic ring model, a radiation electromagnetic noise test is performed in a high-frequency environment to obtain second high-frequency radiation electromagnetic noise test data;

[0121] The first high-frequency radiation electromagnetic noise test data and the second high-frequency radiation electromagnetic noise test data are compared to obtain a high-frequency radiation noise result corresponding to the target magnetic ring model.

[0122] Optionally, the size parameters include at least: the diameter of the AC wire harness and the size of the AC wire harness cavity.

[0123] The embodiment of the present application selects a magnetic ring model with small magnetic permeability at low frequency, large magnetic permeability at high frequency, the largest magnetic ring cross-sectional area, and the smallest number of magnetic ring turns for the AC wire harness based on the size parameters of the AC wire harness, so that the magnetic ring installed on the AC wire harness can achieve the best effect in suppressing electromagnetic noise, ensuring that the magnetic ring plays a good filtering effect for the AC wire harness at different frequencies.

[0124] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Fig.10 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store the selection data of the magnetic ring on the AC wire harness in the electric drive system. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for selecting a magnetic ring on an AC wire harness in an electric drive system is implemented.

[0125] Those skilled in the art will understand that Fig.10 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0126] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0127] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0128] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0129] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0130] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0131] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0132] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for selecting a magnetic ring on an AC wire harness in an electric drive system, characterized in that: The method for selecting the magnetic ring on the AC wire harness in the electric drive system includes: Obtain the size parameters of the AC wire harness in the electric drive system; Determine a second magnetic ring model adapted to the size of the AC wire harness from the first magnetic ring model based on the size parameter, wherein the first magnetic ring model has the characteristics of low magnetic permeability at low frequency and large magnetic permeability at high frequency; Selecting a magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns from the second magnetic ring models as the target magnetic ring model; For an electric drive system without a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-shaft to obtain first conducted electromagnetic noise test data; For an electric drive system equipped with a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-shaft to obtain second conducted electromagnetic noise test data; The first conducted electromagnetic noise test data and the second conducted electromagnetic noise test data are compared to obtain a conducted noise reduction result corresponding to the target magnetic ring model.

2. The method for selecting a magnetic ring on an AC wire harness in an electric drive system according to claim 1, characterized in that: The step of selecting a magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns from the second magnetic ring models as the target magnetic ring model includes: Calculate the cross-sectional area of ​​the magnetic ring according to the outer diameter, inner diameter and height of the magnetic ring of the second magnetic ring model; Determine a third magnetic ring model whose magnetic ring cross-sectional area reaches a magnetic ring cross-sectional area threshold; A magnetic ring model with the smallest number of magnetic ring turns is selected from the third magnetic ring models as the target magnetic ring model.

3. The method for selecting a magnetic ring on an AC wire harness in an electric drive system according to claim 1, characterized in that: After the step of selecting the magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns from the second magnetic ring models as the target magnetic ring model, the method further includes: For an electric drive system without a magnetic ring of the target magnetic ring model, a radiated electromagnetic noise test is performed in a high-frequency environment to obtain first high-frequency radiated electromagnetic noise test data; For an electric drive system equipped with a magnetic ring of the target magnetic ring model, a radiation electromagnetic noise test is performed in a high-frequency environment to obtain second high-frequency radiation electromagnetic noise test data; The first high-frequency radiation electromagnetic noise test data and the second high-frequency radiation electromagnetic noise test data are compared to obtain a high-frequency radiation noise result corresponding to the target magnetic ring model.

4. The method for selecting a magnetic ring on an AC wire harness in an electric drive system according to claim 1, characterized in that: The size parameters include at least: the diameter of the AC wire harness and the size of the AC wire harness cavity.

5. A device for selecting magnetic rings on AC wire harnesses in an electric drive system, characterized in that: The device for selecting the magnetic ring on the AC wire harness in the electric drive system comprises: An acquisition module, used for acquiring dimension parameters of an AC wire harness in an electric drive system; A processing module, configured to determine a second magnetic ring model adapted to the size of the AC wire harness from the first magnetic ring model based on the size parameter, wherein the first magnetic ring model has the characteristics of low magnetic permeability at low frequency and high magnetic permeability at high frequency; Selecting a magnetic ring model with the largest magnetic ring cross-sectional area and the smallest number of magnetic ring turns from the second magnetic ring models as the target magnetic ring model; For an electric drive system without a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-shaft to obtain first conducted electromagnetic noise test data; For an electric drive system equipped with a magnetic ring of the target magnetic ring model, a conducted electromagnetic noise test is performed on a motor half-shaft to obtain second conducted electromagnetic noise test data; The first conducted electromagnetic noise test data and the second conducted electromagnetic noise test data are compared to obtain a conducted noise reduction result corresponding to the target magnetic ring model.

6. An electric drive system, characterized in that: The electric drive system at least comprises: an AC wire harness equipped with a magnetic ring, and the target magnetic ring model of the magnetic ring is determined by the method for selecting a magnetic ring on an AC wire harness in an electric drive system as described in any one of claims 1-4.

7. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for selecting a magnetic ring on an AC wiring harness in an electric drive system according to any one of claims 1 to 4.

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 for selecting a magnetic ring on an AC wiring harness in an electric drive system according to any one of claims 1 to 4 are implemented.

9. A computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the method for selecting a magnetic ring on an AC wiring harness in an electric drive system according to any one of claims 1 to 4.

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