A Simulation-Based Method and System for Electromagnetic Interference Handling of Motor Controllers

Abstract

This invention discloses a simulation-based method and system for handling electromagnetic interference in motor controllers, belonging to the field of electromagnetic compatibility testing and simulation technology. By constructing a test environment structural model including a test bench, artificial power network, shielded cables, current probes, the motor controller body, and the motor load using an electromagnetic simulation platform, electromagnetic field simulation calculations are performed to extract structural parasitic parameters and convert them into an equivalent circuit model. The equivalent circuit model is integrated into the main circuit simulation model to form a field-circuit coupled simulation model, and preliminary conducted emission simulation results are obtained. A current probe model is established, and the transfer impedance calibration factor is calculated. The preliminary simulation results are coupled and calibrated to obtain high-precision conducted emission simulation results. Based on the calibrated simulation results, the suppression effects of different interference suppression schemes are configured and evaluated, and the optimal suppression scheme is selected. The proposed scheme significantly improves the simulation accuracy of the conducted emission current method.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic compatibility testing and simulation technology, specifically to a simulation-based method and system for handling electromagnetic interference in motor controllers. Background Technology

[0002] With the rapid development of the new energy vehicle industry, electric drive systems, as core power components, are experiencing continuous increases in power density and switching frequency. Electromagnetic interference (EMI) generated by motor controllers during high-frequency switching is becoming increasingly prominent, with conducted emission interference being a key indicator affecting the vehicle's electromagnetic compatibility (EMC) compliance and system reliability. In EMC testing systems, conducted emission interference detection primarily includes voltage and current methods. The current method, which can directly collect the coupled interference current on the power cable, has become the core testing method for assessing conducted emissions from motor controllers and is widely used in product development and type certification.

[0003] Currently, the testing and rectification of conducted emission interference in motor controllers within the industry primarily relies on physical prototype testing and engineering experience for debugging. When conducting physical testing using the current method, it is necessary to complete the entire controller assembly, test bench construction, multiple rounds of iterative testing, and interference source localization analysis. This process suffers from high testing difficulty, long development cycles, high testing costs, and insufficient accuracy in interference source localization. Furthermore, rectification solutions heavily depend on engineers' practical experience, making it difficult to establish a standardized and forward-looking design process. To address these issues, the industry is gradually introducing simulation technology to enable early interference prediction and optimized design. By replacing some physical testing with modeling and simulation, the efficiency of electromagnetic compatibility design is improved.

[0004] While existing conducted emission simulation technologies can achieve preliminary predictions of interference levels, they suffer from significant shortcomings in simulation accuracy and engineering applicability. Traditional simulation methods lack precision in areas such as equivalent modeling of interference sources, extraction of system parasitic parameters, and complete equivalence of current-method test loops. They cannot realistically reproduce the electromagnetic propagation characteristics and interference coupling paths in actual test environments, leading to large discrepancies between simulation results and measured data, making it difficult to support the design of effective interference suppression schemes. Furthermore, existing simulation technologies primarily focus on predicting conducted emission interference, failing to establish a complete technical process from simulation modeling, accuracy calibration, interference localization to iterative verification of suppression schemes. Some simulation methods only build models for voltage-method test scenarios, neglecting the core test requirements of the current-method, thus failing to meet the requirements for accurate prediction and efficient suppression of current-method conducted emission interference in motor controllers.

[0005] A search of existing patent literature reveals that patent CN115730552A discloses a simulation modeling method and modeling device for a motor inverter. It obtains the coupled interference current by constructing an equivalent model of a shielded cable and realizes the simulation prediction of the conducted emission current method. However, this method does not consider the influence of controller structural parameters on interference propagation, and the simulation model is not complete enough.

[0006] Patent CN119885608A discloses a simulation method based on conducted emission, which improves simulation accuracy by fusing a 3D environment model with a circuit model. However, it is only applicable to voltage-based simulation scenarios and does not involve current-based simulation analysis, nor does it achieve simulation verification of interference suppression schemes. Patent CN118485034A discloses an electromagnetic conducted emission simulation method for a motor controller system, which improves simulation accuracy through transfer function calibration. However, it also only supports voltage-based simulation and cannot predict and suppress current-based conducted emission interference. In summary, existing technologies cannot simultaneously meet the engineering requirements of high accuracy in current-based simulation, fully equivalent test environments, and iterative suppression schemes. There is an urgent need for a method for electromagnetic interference prediction and suppression that is adaptable to actual test scenarios of motor controllers, has high simulation accuracy, and allows for rapid evaluation of suppression effects. Summary of the Invention

[0007] To address the shortcomings of existing technologies, namely low efficiency in conducting emission current testing and rectification of motor controllers, insufficient accuracy of traditional simulation methods, lack of a complete prediction and suppression process, and inability to adapt to engineering-oriented forward design, this invention proposes a simulation-based electromagnetic interference (EMI) processing method and system for motor controllers. This method achieves accurate prediction of conducted emission interference and rapidly evaluates the effectiveness of interference suppression measures based on simulation models. It overcomes the technical limitations of traditional methods, such as reliance on physical testing, high cost, long development cycles, and difficulty in interference localization, thereby improving the efficiency of electromagnetic compatibility (EMC) design and product reliability for motor controllers.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a simulation-based method for handling electromagnetic interference in a motor controller, the method comprising:

[0010] An electromagnetic simulation platform was used to build a structural model of the test environment.

[0011] Electromagnetic field simulation calculations were performed on the structural model of the test environment to extract the parasitic parameters of the structure and convert them into an equivalent circuit model of the parasitic parameters of the structure.

[0012] A simulation model of the main circuit of the motor controller is constructed, and the equivalent circuit model of the parasitic structural parameters is integrated into it to form a field-circuit coupling simulation model; the field-circuit coupling simulation model is run to obtain preliminary simulation results of conducted emission.

[0013] A current probe model is established, and the transfer impedance calibration factor is calculated. The transfer impedance calibration factor is coupled with the preliminary conducted emission simulation results to obtain the calibrated conducted emission simulation results.

[0014] Based on the calibrated conducted emission simulation results, configure an interference suppression scheme and run the simulation to obtain the suppression effect simulation results; compare and evaluate the suppression effects of different interference suppression schemes, and select the optimal suppression scheme.

[0015] Optionally, the electromagnetic simulation platform is an HFSS simulation platform;

[0016] The test environment structure model includes a test bench, an artificial power network, shielded cables, a current probe, a motor controller body, and a motor load;

[0017] The motor controller body model includes a housing, busbars, power modules, DC bus capacitors, shielding plates, and circuit boards.

[0018] Optionally, the step of performing electromagnetic field simulation calculations on the test environment structural model, extracting structural parasitic parameters, and converting them into an equivalent circuit model of structural parasitic parameters includes:

[0019] A frequency domain solver is used to simulate the entire frequency band of the standard test for conducted emission of motor controllers. Distributed capacitance, distributed inductance and parasitic resistance are extracted by setting port excitation and boundary conditions to generate an equivalent circuit model of structural parasitic parameters that can be directly imported into circuit simulation software.

[0020] Optionally, the circuit simulation software used to construct the simulation model of the main circuit of the motor controller is Simplier software.

[0021] Optionally, the preliminary simulation results of conducted emission obtained from the running field-circuit coupling simulation model include:

[0022] The motor controller was run under electromagnetic compatibility test conditions, and the voltage signal output by the current probe was obtained through simulation as the preliminary simulation result of conducted emission.

[0023] Optionally, establishing the current probe model includes:

[0024] A three-dimensional structural model of the current probe with the same size and material properties as the actual current probe is established. A calibration fixture is configured for the three-dimensional structural model of the current probe, and an excitation input port, an excitation output port and a coupling voltage port are set. The S-parameters of the current probe are extracted by simulation and converted into the equivalent circuit parameter model of the current probe.

[0025] Optionally, the calculation of the transfer impedance calibration factor includes:

[0026] A calibration simulation circuit was built based on the equivalent circuit parameter model of the current probe. A standard excitation current was applied to the cable loop, and the output voltage of the coupling voltage port was collected. The transfer impedance calibration factor was determined by the following formula:

[0027] Z = U / I;

[0028] Where Z is the transfer impedance, U is the output voltage of the coupling voltage port, and I is the standard excitation current.

[0029] Optionally, the coupling calculation of the transfer impedance calibration factor with the preliminary simulation results of conducted emission includes: dividing the voltage signal in the preliminary simulation results of conducted emission by the transfer impedance of the corresponding frequency band to obtain the calibrated simulated results of conducted emission current.

[0030] Optionally, the configuration interference suppression scheme includes adding an XY filter capacitor and a magnetic ring filter device and adjusting the filter device parameters in the main power circuit of the motor controller, or optimizing the stacked area of ​​the controller busbar to reduce the parasitic inductance of the power circuit.

[0031] Secondly, the present invention provides a simulation-based electromagnetic interference processing system for a motor controller, the system comprising:

[0032] The test environment structure model module is used to build a test environment structure model using an electromagnetic simulation platform.

[0033] The parasitic parameter extraction module is used to perform electromagnetic field simulation calculations on the test environment structural model, extract structural parasitic parameters, and convert them into an equivalent circuit model of structural parasitic parameters.

[0034] The preliminary simulation module is used to construct a simulation model of the main circuit of the motor controller and integrate the equivalent circuit model of the structural parasitic parameters into it to form a field-circuit coupling simulation model; the field-circuit coupling simulation model is run to obtain preliminary simulation results of conducted emission.

[0035] The calibration module is used to establish a current probe model and calculate the transfer impedance calibration factor; the transfer impedance calibration factor is coupled with the preliminary conducted emission simulation results to obtain the calibrated conducted emission simulation results;

[0036] The suppression scheme evaluation module is used to configure an interference suppression scheme based on the calibrated conducted emission simulation results and run the simulation to obtain the suppression effect simulation results; compare and evaluate the suppression effects of different interference suppression schemes, and select the optimal suppression scheme.

[0037] Compared with the closest prior art, the present invention has the following beneficial effects:

[0038] The electromagnetic interference processing method and system for motor controllers based on simulation proposed in this invention have the following beneficial effects:

[0039] By comprehensively considering the influence of structural parasitic parameters, a complete test environment structural model covering key aspects such as test circuits, interface layout, and shielded cables was built. Through model calibration and optimization, a high-precision conducted emission current method simulation model was constructed.

[0040] By establishing a current probe structural model, building a calibration circuit, and calibrating the probe's transfer impedance, accurate conducted emission results of the system can be obtained, reducing calculation errors caused by probe model deviations and ensuring that simulation results are comparable and reliable with measured results.

[0041] The simulation model enables rapid evaluation of conducted interference suppression methods, which can quickly assess the effectiveness of interference suppression measures, save testing costs, and shorten the development cycle.

[0042] The simulation circuit and simulation model in this invention have clear topology and explicit physical meaning, enabling the prediction of conducted interference in the early stages of product design and providing optimization suggestions. The model has high accuracy and simulation efficiency, and has engineering application value. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0044] Figure 1 This is a flowchart of a simulation-based electromagnetic interference processing method for motor controllers provided in an embodiment of the present invention.

[0045] Figure 2 This is a schematic diagram of the artificial power network shell model provided in an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of a shielded cable model provided in an embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of the current probe model provided in an embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of the controller structure model provided in an embodiment of the present invention;

[0049] Figure 6 This is a schematic diagram of the lumped parameter model of the motor equivalent circuit provided in an embodiment of the present invention;

[0050] Figure 7 This is a schematic diagram of the test bench model provided in an embodiment of the present invention;

[0051] Figure 8 This is a schematic diagram of the test structure model for the conducted emission current method provided in an embodiment of the present invention;

[0052] Figure 9 This is a schematic diagram of the current probe calibration model provided in an embodiment of the present invention;

[0053] Figure 10 This is a schematic diagram of the current probe calibration simulation circuit provided in an embodiment of the present invention;

[0054] Figure 11 This is an example diagram of the current probe transfer impedance curve provided in an embodiment of the present invention;

[0055] Figure 12 Example figure of simulation results of the conducted emission current method for motor controller;

[0056] Figure 13 This is a schematic diagram of the electromagnetic interference processing system for a motor controller based on simulation provided in an embodiment of the present invention. Detailed Implementation

[0057] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore merely examples, and should not be construed as limiting the scope of protection of the present invention.

[0058] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0059] This invention provides a simulation-based method and system for handling electromagnetic interference in motor controllers, applicable to the electromagnetic compatibility design of motor controllers in new energy vehicles. The embodiments of this invention are described below with reference to the accompanying drawings.

[0060] Example 1: Please refer to Figure 1 Embodiment 1 of the present invention provides a simulation-based method for handling electromagnetic interference in motor controllers, which specifically includes the following steps:

[0061] S101 uses an electromagnetic simulation platform to build a test environment structural model;

[0062] S102 performs electromagnetic field simulation calculations on the test environment structural model, extracts structural parasitic parameters, and transforms them into an equivalent circuit model of structural parasitic parameters.

[0063] S103 constructs a simulation model of the main circuit of the motor controller and integrates the equivalent circuit model of the structural parasitic parameters into it to form a field-circuit coupling simulation model; running the field-circuit coupling simulation model, the preliminary simulation results of conducted emission are obtained;

[0064] S104 establishes a current probe model and calculates the transfer impedance calibration factor; the transfer impedance calibration factor is coupled with the preliminary conducted emission simulation results to obtain the calibrated conducted emission simulation results;

[0065] S105 configures an interference suppression scheme based on the calibrated conducted emission simulation results and runs the simulation to obtain the suppression effect simulation results; compares and evaluates the suppression effects of different interference suppression schemes, and selects the optimal suppression scheme.

[0066] In the above embodiments, the test environment structure model includes a test bench, an artificial power network, shielded cables, a current probe, a motor controller body, and a motor load;

[0067] In electromagnetic compatibility (EMC) testing, the artificial power network serves as an auxiliary device, isolating electromagnetic interference, providing stable test impedance, and acting as a filter. Its structural model is an open cuboid. The influence of its internal structure on electromagnetic propagation is characterized by the equivalent circuit of the connection ports. Therefore, the artificial power network structure only requires the establishment of an external model, such as... Figure 2 As shown.

[0068] The conducted emission current method uses a current probe to measure the coupled current on the power line. The motor controller's power line is a shielded cable, and the current probe couples the current to the shielding layer. Based on the actual length, dimensions, and internal structure of the cable, a three-dimensional model of the shielded cable is created, including the core, shielding layer, and insulation layer. Figure 3 As shown.

[0069] The function of a current probe is to be fitted onto a high-voltage power line harness and to determine the magnitude of conducted interference by sensing the magnetic field generated by the conducted current in the harness. Based on actual experiments, a model of the current probe's characteristics and dimensions is established, including the outer shell and the internal ferrite core, such as... Figure 4 As shown.

[0070] The controller, including its housing, busbars, power modules, DC bus capacitors, shielding plates, and circuit boards, is one of the largest structures in the system. It directly affects the system's distributed parameters and interference current coupling paths, requiring precise modeling. Figure 5 As shown.

[0071] Since the motor itself only serves as a load and does not generate interference, it is simplified in structural modeling, retaining only the motor casing. Its internal equivalent circuit is implemented using lumped parameters to improve computational efficiency. The motor is represented by an RL circuit as a common-mode interference loop, which can characterize electromagnetic propagation characteristics, such as... Figure 6 As shown.

[0072] In step S101 above, the electromagnetic simulation platform is the HFSS simulation platform;

[0073] In one embodiment, in the model establishment of step S101 above, the HFSS simulation platform is used to build a structural model of the conducted emission current method test environment according to the CISPR25 standard. The model includes: a test bench with a length of 2.5m and a width of 1.1m, and a grounding metal plate with a width of 0.5m and a height of 0.9m. The structural model is as follows: Figure 7 As shown, the boundary is set as a finite conductor, and the material used is the actual material of the test bench. The artificial power network shell has an open cuboid structure, a 3D model of a shielded cable (including the core, shielding layer, and insulation layer) matching the actual size, a current probe model including the shell and ferrite core, and a motor controller model including the shell, busbars, power modules, DC bus capacitors, shielding plate, and circuit board, simplified to a motor model of the shell. A grounding metal plate is set as the finite conductor boundary, and each component matches the actual material properties. Electromagnetic field simulation is performed in the 0.01MHz~1000MHz frequency band using a frequency domain solver to extract structural parasitic parameters such as distributed capacitance, distributed inductance, and parasitic resistance, generating an equivalent circuit model of the structural parasitic parameters, such as... Figure 8 .

[0074] In step S103 above, the simulation model of the main circuit of the motor controller is constructed as follows: a system circuit model is established based on the real circuit topology, which consists of a high-voltage power supply, an artificial power supply network circuit, a shielded cable circuit, a current probe circuit, a controller power main circuit, an equivalent circuit model of structural parasitic parameters, and an equivalent load of the motor.

[0075] A joint simulation was performed to obtain the output results of the current probe, yielding preliminary simulation results of the conducted emissions from the motor controller. In this embodiment, the motor controller was operated under electromagnetic compatibility test conditions, and the voltage signal output by the current probe was simulated and obtained.

[0076] The above step S104, which involves establishing a current probe model and calculating a transfer impedance calibration factor, further includes coupling the transfer impedance calibration factor with the preliminary conducted emission simulation results to obtain calibrated conducted emission simulation results:

[0077] Current probes are not ideal sensors. In actual testing, the current probe measures a voltage signal, which is then converted into current using the probe's transfer impedance. Therefore, it is necessary to calibrate the current probe model to determine its transfer impedance. Then, the simulated voltage of the current probe is divided by the transfer impedance to obtain the accurate conducted emission result of the system. This step improves the simulation accuracy of the conducted emission current, reduces calculation errors caused by probe model deviations, and ensures the comparability and reliability of simulation and measured results.

[0078] 1. Calibration Model Establishment

[0079] Models of calibration fixtures are built at both ends of the current probe, such as... Figure 9 As shown. Three ports are set up: the current probe excitation input port, the excitation output port, and the coupling voltage port. An S-parameter model containing full-band information is derived, which is the equivalent circuit parameter model of the calibration model.

[0080] 2. Calibration simulation circuit setup

[0081] Using the equivalent circuit parameter model of the calibration model, a calibration simulation circuit is built as follows: Figure 10 As shown, a standard excitation current of I=1A is applied to the cable, and the voltage U at the probe coupling voltage port is obtained through simulation. The transfer impedance Z=U / I of the probe is then calculated, resulting in the following... Figure 11 The example of a transfer impedance curve is shown.

[0082] 3. Simulation result calibration

[0083] Divide the initial conducted emission simulation result (voltage signal) of the motor controller by the transfer impedance Z of the current probe to obtain the calibrated conducted emission current method simulation result of the system. For example... Figure 12 As shown, this allows for the prediction of system conducted interference performance, guiding product design to seek optimization measures and design directions.

[0084] The calculated transfer impedance calibration factor includes:

[0085] A calibration simulation circuit was built based on the equivalent circuit parameter model of the current probe. A standard excitation current was applied to the cable loop, and the output voltage of the coupling voltage port was collected. The transfer impedance calibration factor was determined by the following formula:

[0086] Z = U / I;

[0087] Where Z is the transfer impedance, U is the output voltage of the coupling voltage port, and I is the standard excitation current.

[0088] In step S105 above, conducted interference suppression measures are implemented by adding or modifying devices and parameters in the simulation model to simulate actual conducted interference suppression measures. Two examples are given below:

[0089] Example 1: Adding filtering components

[0090] Filtering components, including XY filter capacitors and a filter ferrite core, were added to the main power circuit, and their parameters were adjusted. Simulation results showed a reduction in interference amplitude, indicating that this measure effectively suppressed interference.

[0091] Example 2: Optimize structural layout

[0092] The controller structure model was optimized by increasing the busbar stack area and reducing the parasitic inductance of the loop. Simulation results show that the interference amplitude is reduced, indicating that this measure can effectively suppress interference.

[0093] Further, in step S105, the evaluation and selection of suppression schemes includes: based on the calibrated conducted emission simulation results, configuring different interference suppression schemes and running simulations to obtain the simulation results of the suppression effect of each scheme. The suppression effects of different interference suppression schemes are compared and evaluated, the amplitude attenuation of the interference peak frequency band is statistically analyzed, and suppression schemes with amplitude attenuation greater than a set threshold are determined as effective schemes. The suppression scheme parameters are iteratively optimized, and the optimal suppression scheme is selected.

[0094] The above simulation methods can quickly and accurately evaluate the effectiveness of measures to reduce conducted interference, save on prototyping and testing costs, guide product design, and are suitable for engineering applications.

[0095] Example 2: Based on the same inventive concept, Example 2 of this application also provides a simulation-based electromagnetic interference processing system for a motor controller. The solution provided by this system is similar to the implementation scheme described in the above-described examples. Therefore, the specific limitations of one or more embodiments of a simulation-based electromagnetic interference processing system for a motor controller provided below can be found in the limitations of the simulation-based electromagnetic interference processing method for a motor controller described above, and will not be repeated here.

[0096] In one embodiment, Embodiment 2 of the present invention provides a simulation-based electromagnetic interference processing system for a motor controller, which is as follows: Figure 13 As shown, it includes: a test environment structure model module 210, a parasitic parameter extraction module 220, a preliminary simulation module 230, a calibration module 240, and a suppression scheme evaluation module 250, wherein:

[0097] Test environment structure model module 210 is used to build a test environment structure model using an electromagnetic simulation platform;

[0098] Parasitic parameter extraction module 220 is used to perform electromagnetic field simulation calculations on the test environment structural model, extract structural parasitic parameters, and convert them into an equivalent circuit model of structural parasitic parameters.

[0099] The preliminary simulation module 230 is used to construct a simulation model of the main circuit of the motor controller and integrate the equivalent circuit model of the structural parasitic parameters into it to form a field-circuit coupling simulation model; the field-circuit coupling simulation model is run to obtain preliminary simulation results of conducted emission.

[0100] The calibration module 240 is used to establish a current probe model and calculate the transfer impedance calibration factor; the transfer impedance calibration factor is coupled with the preliminary conducted emission simulation results to obtain the calibrated conducted emission simulation results;

[0101] The suppression scheme evaluation module 250 is used to configure an interference suppression scheme based on the calibrated conducted emission simulation results and run the simulation to obtain the suppression effect simulation results; compare and evaluate the suppression effects of different interference suppression schemes, and select the optimal suppression scheme.

[0102] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0103] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0104] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0105] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0106] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A simulation-based method for handling electromagnetic interference in a motor controller, characterized in that, The method includes: An electromagnetic simulation platform was used to build a structural model of the test environment. Electromagnetic field simulation calculations were performed on the structural model of the test environment to extract the parasitic parameters of the structure and convert them into an equivalent circuit model of the parasitic parameters of the structure. A simulation model of the main circuit of the motor controller is constructed, and the equivalent circuit model of the parasitic structural parameters is integrated into it to form a field-circuit coupling simulation model; the field-circuit coupling simulation model is run to obtain preliminary simulation results of conducted emission. A current probe model is established, and the transfer impedance calibration factor is calculated. The transfer impedance calibration factor is coupled with the preliminary conducted emission simulation results to obtain the calibrated conducted emission simulation results. Based on the calibrated conducted emission simulation results, configure an interference suppression scheme and run the simulation to obtain the suppression effect simulation results; compare and evaluate the suppression effects of different interference suppression schemes, and select the optimal suppression scheme.

2. The method according to claim 1, characterized in that, The electromagnetic simulation platform is the HFSS simulation platform. The test environment structure model includes a test bench, an artificial power network, shielded cables, a current probe, a motor controller body, and a motor load; The motor controller body model includes a housing, busbars, power modules, DC bus capacitors, shielding plates, and circuit boards.

3. The method according to claim 1, characterized in that, The process of performing electromagnetic field simulation calculations on the test environment structural model, extracting structural parasitic parameters, and converting them into an equivalent circuit model of the structural parasitic parameters includes: A frequency domain solver is used to simulate the entire frequency band of the standard test for conducted emission of motor controllers. Distributed capacitance, distributed inductance and parasitic resistance are extracted by setting port excitation and boundary conditions to generate an equivalent circuit model of structural parasitic parameters that can be directly imported into circuit simulation software.

4. The method according to claim 1, characterized in that, The circuit simulation software used to construct the simulation model of the main circuit of the motor controller is Simplier software.

5. The method according to claim 1, characterized in that, The preliminary simulation results of the conducted emission obtained from the operational field-circuit coupling simulation model include: The motor controller was run under electromagnetic compatibility test conditions, and the voltage signal output by the current probe was obtained through simulation as the preliminary simulation result of conducted emission.

6. The method according to claim 1, characterized in that, The establishment of the current probe model includes: A three-dimensional structural model of the current probe with the same size and material properties as the actual current probe is established. A calibration fixture is configured for the three-dimensional structural model of the current probe, and an excitation input port, an excitation output port and a coupling voltage port are set. The S-parameters of the current probe are extracted by simulation and converted into the equivalent circuit parameter model of the current probe.

7. The method according to claim 6, characterized in that, The calculated transfer impedance calibration factor includes: A calibration simulation circuit was built based on the equivalent circuit parameter model of the current probe. A standard excitation current was applied to the cable loop, and the output voltage of the coupling voltage port was collected. The transfer impedance calibration factor was determined by the following formula: Z = U / I; Where Z is the transfer impedance, U is the output voltage of the coupling voltage port, and I is the standard excitation current.

8. The method according to claim 1, characterized in that, The coupling calculation of the transfer impedance calibration factor with the preliminary simulation results of conducted emission includes: dividing the voltage signal in the preliminary simulation results of conducted emission by the transfer impedance of the corresponding frequency band to obtain the calibrated simulated results of conducted emission current.

9. The method according to claim 1, characterized in that, The interference suppression scheme includes adding XY filter capacitors and magnetic ring filter devices to the main power circuit of the motor controller and adjusting the filter device parameters, or optimizing the stacked area of ​​the controller busbar to reduce the parasitic inductance of the power circuit.

10. A simulation-based electromagnetic interference processing system for motor controllers, characterized in that, The system includes: The test environment structure model module is used to build a test environment structure model using an electromagnetic simulation platform. The parasitic parameter extraction module is used to perform electromagnetic field simulation calculations on the test environment structural model, extract structural parasitic parameters, and convert them into an equivalent circuit model of structural parasitic parameters. The preliminary simulation module is used to construct a simulation model of the main circuit of the motor controller and integrate the equivalent circuit model of the structural parasitic parameters into it to form a field-circuit coupling simulation model; the field-circuit coupling simulation model is run to obtain preliminary simulation results of conducted emission. The calibration module is used to establish a current probe model and calculate the transfer impedance calibration factor; the transfer impedance calibration factor is coupled with the preliminary conducted emission simulation results to obtain the calibrated conducted emission simulation results; The suppression scheme evaluation module is used to configure an interference suppression scheme based on the calibrated conducted emission simulation results and run the simulation to obtain the suppression effect simulation results; compare and evaluate the suppression effects of different interference suppression schemes, and select the optimal suppression scheme.

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