A method for comparing the electromagnetic compatibility performance of electric drive systems

Abstract

The present invention provides a method for arranging an electromagnetic compatibility performance comparison test for an electric drive system. The method comprises setting up a reference laboratory and a comparison laboratory, wherein the electric drive system is arranged in both the reference laboratory and the comparison laboratory, and the spacing between the components of the electric drive system is arranged according to a manually set value. The spacing between the components in the reference laboratory and the comparison laboratory are compared for their layout deviations. Under the same frequency domain, electrical parameter deviation detection is performed on the electric drive system in the reference laboratory and the comparison laboratory respectively. If the spacing between the components in the comparison laboratory has a layout deviation value of less than or equal to 10%, and the electrical parameter detection deviation value in the comparison laboratory is less than or equal to 10%, the comparison laboratory is qualified. The method for arranging an electromagnetic compatibility performance comparison test for an electric drive system according to the present invention eliminates environmental factors that may affect test data in the laboratory layout from the perspectives of the spacing between the components and the electrical parameters, thereby improving the authenticity and reliability of the test.

Description

Technical Field

[0001] The present invention belongs to the field of electromagnetic compatibility testing, and in particular relates to an electromagnetic compatibility performance comparison test arrangement method for an electric drive system. Background Art

[0002] With the development of new energy vehicles, the electromagnetic compatibility (EMC) performance of electric vehicles is becoming increasingly important for vehicle safety, and the electromagnetic compatibility (EMC) of electric drive systems is a major factor affecting the EMC of electric vehicles. EMC performance testing of electric drive systems is primarily performed in EMC chambers. Currently, a growing number of institutions in the industry are capable of performing EMC performance testing of electric drive systems. However, the equipment used, site environments, and other factors vary, leading to significant differences in the measured results. Therefore, it is necessary to conduct comparative EMC performance testing of electric drive systems between different EMC chambers to identify factors influencing differences in test results, thereby ensuring consistency and accuracy in EMC performance testing of electric drive systems within the industry. Differences in sample placement environments are one of the key factors affecting the results of EMC performance comparison tests of electric drive systems. Therefore, it is necessary to provide a placement method to reduce the differences in test results caused by the sample placement environment in the laboratory. Summary of the Invention

[0003] In view of this, the present invention aims to propose an electromagnetic compatibility performance comparison test arrangement method for an electric drive system to solve the problem of test result differences caused by the laboratory sample arrangement environment.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A method for arranging an electromagnetic compatibility performance comparison test for an electric drive system, the specific steps of which are as follows:

[0006] S1. Set up a reference laboratory and a comparison laboratory, both of which are equipped with an electromagnetic compatibility darkroom;

[0007] S2. The comparison laboratory is arranged corresponding to the reference laboratory. The electric drive system is set up in the electromagnetic compatibility darkroom. The position and spacing of each component of the electric drive system are arranged according to the manually set value.

[0008] S3. Compare the layout deviations of the position spacing between each component in the reference laboratory and the position spacing in the comparison laboratory respectively, and ensure that the deviation value is less than or equal to 10%. In this case, the layout of the position spacing of each component in the comparison laboratory is qualified;

[0009] S4. Setting the reference laboratory and the comparison laboratory in the same frequency domain state, respectively performing electrical parameter testing on the electric drive systems in the reference laboratory and the comparison laboratory, wherein the electrical parameter testing is to test the ground impedance of each port using an impedance analyzer;

[0010] S5. Compare the grounding impedance of each port in the reference laboratory with the grounding impedance of the corresponding port in the comparison laboratory. Ensure that the deviation is less than or equal to 10%. The electrical parameter test in the comparison laboratory is qualified.

[0011] S6. If the arrangement of the positions and spacings of the components in the comparison laboratory in step S3 is qualified, and the electrical parameter test in the comparison laboratory in step S5 is qualified, then the comparison laboratory setting is qualified.

[0012] Furthermore, in step S2, an electric drive system is set up in an electromagnetic compatibility darkroom. Specifically, the method is as follows:

[0013] A test table is set up in the electromagnetic compatibility darkroom, and a dynamometer stand is set up on one side of the test seat. The electric drive system includes a motor, a battery simulator, and a battery. The motor is set up on the dynamometer stand, and the motor shaft is connected to the dynamometer shaft of the dynamometer through an insulating coupling.

[0014] The motor controller is connected to the high-voltage artificial network and then connected to the battery simulator. The motor controller is also connected to the battery through the low-voltage artificial network. The motor controller and the low-voltage artificial network are connected through a low-voltage line. The motor controller and the high-voltage artificial network are connected through a high-voltage DC bus. The high-voltage DC bus is arranged in parallel with the low-voltage line.

[0015] The high-voltage artificial network, the low-voltage artificial network, and the battery are all arranged on a test table, and the filter, the battery simulator, and the dynamometer are all arranged outside the electromagnetic compatibility darkroom.

[0016] Furthermore, the high-voltage DC bus is also connected to peripheral auxiliary equipment; and a filter is provided between the high-voltage artificial network and the battery simulator.

[0017] Furthermore, in step S2, the position spacing of each component of the electric drive system is arranged according to the manually set value. The specific method is as follows:

[0018] The motor is installed at an angle such that the high-voltage DC bus port of the motor is parallel to the test table. The motor is installed at a height of 1.5m. The distance between the motor and the front side of the test table is 200mm.

[0019] The distance between the high-voltage DC busbar and the low-voltage line is 200mm, and the distance between the low-voltage line and the front side of the test table is 100mm;

[0020] The distance between the high-voltage artificial network and the low-voltage artificial network is 100 mm, and the low-voltage artificial network is 100 mm away from the front side of the test table;

[0021] The peripheral auxiliary equipment is 500m away from the front side of the test table.

[0022] Furthermore, in step S4, the reference laboratory and the comparison laboratory are set in the same frequency domain state, and the same frequency domain is 150 kHz-2.5 GHz.

[0023] Furthermore, in step S4, the ports include a high-voltage artificial network RF output port, a low-voltage artificial network RF output port, a motor shaft, a motor grounding point, a shielding layer of the high-voltage DC bus, and a core wire of the high-voltage DC bus.

[0024] Compared with the prior art, the electromagnetic compatibility performance comparison test arrangement method of an electric drive system described in the present invention has the following beneficial effects:

[0025] (1) The electromagnetic compatibility performance comparison test layout method of an electric drive system described in the present invention eliminates the possibility that the laboratory layout is an environmental factor that may affect the test data by comparing the position spacing layout of each component in the laboratory and the electrical parameter detection in the laboratory.

[0026] (2) The electromagnetic compatibility performance comparison test arrangement method of an electric drive system described in the present invention can reduce the deviation of test results caused by different spatial electromagnetic field intensity distribution due to different positions by controlling the position distance of each component; controlling the position distance of the high-voltage DC bus and the low-voltage line can reduce the deviation of test results caused by factors such as signal coupling between wire harnesses due to different positions of the wire harnesses, different radiation intensity of the spatial electromagnetic field of the wire harnesses, etc., and try to eliminate environmental factors generated when arranging the wire harnesses of each component.

[0027] (3) The electromagnetic compatibility performance comparison test arrangement method of an electric drive system described in the present invention controls the deviation of electrical parameters, controls the impedance of the high-voltage artificial network RF output port, the shielding layer of the high-voltage DC bus, and the core wire of the high-voltage DC bus, which can reduce the deviation of test results caused by factors such as high-voltage system impedance mismatch and poor grounding of the high-voltage system; controls the impedance of the low-voltage artificial network RF output port, which can reduce the deviation of test results caused by factors such as low-voltage system impedance mismatch and poor grounding of the low-voltage system; controls the motor shaft impedance, which can reduce the deviation of test results caused by factors such as the electric shaft current generated during the rotation of the motor; controls the grounding point impedance of the motor, which can reduce the deviation of test results caused by the different electromagnetic field strengths radiated outward by noise through the motor grounding point, and tries to eliminate the deviation of electrical parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 A schematic diagram of an arrangement method for comparing and testing the electromagnetic compatibility performance of an electric drive system according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of impedance testing between the radio frequency output port of the artificial network and the test table according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of impedance value testing between a motor grounding point and a test table according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of impedance value testing between a motor shaft and a test table according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of impedance value testing between a high-voltage DC bus core wire and a test table according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of impedance testing between the high-voltage DC bus shielding layer and the test table according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0039] A reference laboratory and a comparison laboratory are set up, wherein both the reference laboratory and the comparison laboratory are equipped with an electromagnetic compatibility darkroom; the comparison laboratory is arranged corresponding to the reference laboratory, an electric drive system is set up in the electromagnetic compatibility darkroom, and the position spacing of each component of the electric drive system is arranged according to a manually set value;

[0040] The reference laboratory data is as follows:

[0041] The motor (including the controller, reducer, differential, and other connectors) is installed at an angle such that the motor's high-voltage DC bus port is parallel to the test table. The motor's installation height is measured to be 1.5 meters, and the distance between the motor and the edge of the test table is 200 mm.

[0042] The distance between the high and low voltage harnesses is 200mm; the distance between the low voltage harness and the edge of the test table is 100mm;

[0043] The distance between the high-voltage artificial network and the low-voltage artificial network is 100mm; the low-voltage artificial network is 100mm away from the edge of the test table;

[0044] Peripheral auxiliary equipment (if necessary) should be 500mm away from the edge of the test table;

[0045] The peripheral auxiliary equipment includes a resistor and a warning light.

[0046] Similarly, after arranging the comparison laboratory, measure the comparison laboratory data corresponding to the reference laboratory, and compare each set of corresponding data between the reference laboratory and the comparison laboratory.

[0047] Measure the motor (including the controller, reducer, differential and other connecting parts) installation angle, height, and distance from the test table to ensure that the deviation between the values ​​and the reference values ​​of the corresponding measurement content in the reference test is ≤10%;

[0048] Measure the distance between the high and low voltage harnesses, and the distance between the high and low voltage harnesses and the edge of the test table, ensuring that the deviation between the values ​​and the reference values ​​of the corresponding measurement contents in the reference test is ≤10%;

[0049] Measure the distance between the high-voltage artificial network and the low-voltage artificial network, and the distance between the high-voltage artificial network and the low-voltage artificial network and the edge of the test table, and ensure that the deviation between the values ​​and the reference values ​​of the corresponding measurement contents in the reference test is ≤10%;

[0050] Measure the installation position of peripheral auxiliary equipment (if necessary) and ensure that the deviation between the value and the reference value of the corresponding measurement content in the reference test is ≤10%;

[0051] The spacing between the components in the comparison laboratory is qualified;

[0052] The reference laboratory and the comparison laboratory were both set up in the 150kHz-2.5GHZ frequency domain, and electrical parameter testing was performed on the electric drive systems in the reference laboratory and the comparison laboratory respectively. The electrical parameter testing was performed by testing the ground impedance of each port using an impedance analyzer;

[0053] The reference laboratory tests electrical parameters as follows to obtain different reference values ​​for different ports:

[0054] The ground impedance of the high-voltage artificial network RF output port is C = 100pF, L = 100mH, R = 10mΩ; the ground impedance of the low-voltage artificial network RF output port is C = 100pF, L = 100mH, 2.5mΩ;

[0055] The ground impedance between the motor shaft and the test table is C = 100pF, L = 100mH, 20mΩ; the ground impedance between the motor ground point and the test table is C = 100pF, L = 100mH, 20mΩ;

[0056] The grounding impedance between the shield layer of the high-voltage DC busbar and the test table is C = 100pF, L = 100mH, 10mΩ; the grounding impedance of the high-voltage DC busbar core wire is C = 100pF, L = 100mH, 1MΩ;

[0057] Conduct electrical parameter tests on each port in the comparison laboratory and compare them with the reference values ​​of the corresponding ports in the reference laboratory.

[0058] Measure the ground impedance of the high-voltage artificial network and the low-voltage artificial network RF output port, and ensure that the deviation between the value and the reference value is ≤10%;

[0059] Measure the ground impedance of the motor shaft, the motor grounding point, and the test table, and ensure that the deviation between the value and the reference value is ≤10%;

[0060] Measure the shield layer and core wire grounding impedance of the high-voltage DC busbar to ensure that the deviation between the values ​​and the reference values ​​is ≤10%;

[0061] The electrical parameters of each component in the laboratory are compared and found to be qualified;

[0062] If the spacing and arrangement of the components in the comparison laboratory are qualified and the electrical parameter tests in the comparison laboratory are qualified, then the comparison laboratory setting is qualified; otherwise, it is unqualified.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for arranging an electromagnetic compatibility performance comparison test for an electric drive system, characterized by: The specific steps are as follows: S1. Set up a reference laboratory and a comparison laboratory, both of which are equipped with an electromagnetic compatibility darkroom; S2. The comparison laboratory is arranged corresponding to the reference laboratory. The electric drive system is set up in the electromagnetic compatibility darkroom. The position and spacing of each component of the electric drive system are arranged according to the manually set value. S3. Compare the layout deviations of the position spacing between each component in the reference laboratory and the position spacing in the comparison laboratory respectively, and ensure that the deviation value is less than or equal to 10%. In this case, the layout of the position spacing of each component in the comparison laboratory is qualified; S4. Setting the reference laboratory and the comparison laboratory in the same frequency domain state, respectively performing electrical parameter testing on the electric drive systems in the reference laboratory and the comparison laboratory, wherein the electrical parameter testing is to test the ground impedance of each port using an impedance analyzer; S5. Compare the grounding impedance of each port in the reference laboratory with the grounding impedance of the corresponding port in the comparison laboratory. Ensure that the deviation is less than or equal to 10%. The electrical parameter test in the comparison laboratory is qualified. S6. If the arrangement of the positions and spacings of the components in the comparison laboratory in step S3 is qualified, and the electrical parameter test in the comparison laboratory in step S5 is qualified, then the comparison laboratory setting is qualified.

2. The electromagnetic compatibility performance comparison test arrangement method of an electric drive system according to claim 1, characterized in that: In step S2, the electric drive system is set up in an electromagnetic compatibility darkroom. The specific method is as follows: A test table is set up in the electromagnetic compatibility darkroom, and a dynamometer stand is set up on one side of the test table. The electric drive system includes a motor, a battery simulator, and a battery. The motor is set up on the dynamometer stand, and the rotating shaft of the motor is connected to the dynamometer shaft of the dynamometer through an insulating coupling. The motor controller is connected to the high-voltage artificial network and then to the battery simulator. The motor controller is also connected to the battery through the low-voltage artificial network. The motor controller and the low-voltage artificial network are connected via a low-voltage line. The motor controller and the high-voltage artificial network are connected via a high-voltage DC bus. The high-voltage DC bus is arranged in parallel with the low-voltage line. The high-voltage DC bus is also connected to peripheral auxiliary equipment; a filter is provided between the high-voltage artificial network and the battery simulator; The high-voltage artificial network, the low-voltage artificial network, and the battery are all arranged on a test table, and the filter, the battery simulator, and the dynamometer are all arranged outside the electromagnetic compatibility darkroom.

3. The electromagnetic compatibility performance comparison test arrangement method of an electric drive system according to claim 2, characterized in that: In step S2, the position spacing of each component of the electric drive system is arranged according to the manually set value. The specific method is as follows: The motor is installed at an angle such that the high-voltage DC bus port of the motor is parallel to the test table. The motor is installed at a height of 1.5m. The distance between the motor and the front side of the test table is 200mm. The distance between the high-voltage DC busbar and the low-voltage line is 200mm, and the distance between the low-voltage line and the front side of the test table is 100mm; The distance between the high-voltage artificial network and the low-voltage artificial network is 100 mm, and the low-voltage artificial network is 100 mm away from the front side of the test table; The peripheral auxiliary equipment is 500m away from the front side of the test table.

4. The electromagnetic compatibility performance comparison test arrangement method of an electric drive system according to claim 1, characterized in that: In step S4, the reference laboratory and the comparison laboratory are set in the same frequency domain state, and the same frequency domain is 150 kHz-2.5 GHz.

5. The electromagnetic compatibility performance comparison test arrangement method of an electric drive system according to claim 1, characterized in that: In step S4, the ports include a high-voltage artificial network radio frequency output port, a low-voltage artificial network radio frequency output port, a motor shaft, a motor grounding point, a shielding layer of the high-voltage DC bus, and a core wire of the high-voltage DC bus.

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