Electromagnetic compatibility darkroom electric drive rack background noise verification method

Abstract

The application provides an electric drive bench background noise verification method for an electromagnetic compatibility darkroom. An electric drive system is arranged in the electromagnetic compatibility darkroom. The electric drive system comprises a motor. A motor shaft is connected with a dynamometer shaft. A motor controller is connected with a battery simulator through a high-voltage artificial network. A set rotating speed is given to the dynamometer. The motor is dragged to rotate at a stable rotating speed. The battery simulator is adjusted to a load mode to absorb power supply of the electric drive system. After the working condition is stable, an antenna for detecting noise is placed at a position with a human-set distance from a table edge. The result of the antenna receiver is compared with a reference value. If the result is lower than a required value, the background noise requirement is met. If the result is higher than the required value, the background noise requirement is not met. The electric drive bench background noise verification method for the electromagnetic compatibility darkroom combines the electric drive system with the dynamometer and the battery simulator. The electric drive system is under a load condition. Background noise testing is performed. The result is more real, accurate and effective.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of electromagnetic compatibility noise detection, and particularly relates to a method for verifying background noise of an electric drive rack for an electromagnetic compatibility anechoic chamber. BACKGROUND

[0002] With the development of new energy vehicles, the electromagnetic compatibility performance of electric vehicles is increasingly important in vehicle safety, and the electromagnetic compatibility of the electric drive system is the main aspect affecting the electromagnetic compatibility of electric vehicles. The electromagnetic compatibility test of the electric drive system is mainly completed in the electromagnetic compatibility anechoic chamber, and the dynamometer and the battery simulator need to be loaded at the same time for testing, and the background noise of the electromagnetic compatibility anechoic chamber electric drive rack is the prerequisite for determining whether it can meet the electromagnetic compatibility test requirements of the electric drive system. Therefore, a method is needed to verify the background noise of the electromagnetic compatibility anechoic chamber electric drive rack to determine whether it meets the electromagnetic compatibility test requirements of the electric drive system. At present, the background noise verification is carried out under no load, which is different from the actual load test, and does not meet the requirements of background noise verification. The industry needs a background noise test method under loading conditions to solve the problem of background noise verification of the electromagnetic compatibility anechoic chamber electric drive rack. SUMMARY

[0003] Therefore, the application aims to provide a method for verifying background noise of an electric drive rack for an electromagnetic compatibility anechoic chamber to solve the problem that the background noise verification is carried out under no load at present, which is different from the actual load test.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0005] A method for verifying background noise of an electric drive rack for an electromagnetic compatibility anechoic chamber, the specific steps are as follows:

[0006] S1, arranging an electric drive system in an electromagnetic compatibility anechoic chamber, the motor drive system comprising a motor, connecting the motor shaft with the dynamometer shaft;

[0007] S2, connecting the motor controller with the battery simulator through a high-voltage artificial network;

[0008] S3, giving a motor speed set by a person, so that the motor is driven by the dynamometer to rotate at a stable speed;

[0009] S4, adjusting the battery simulator to a load mode to absorb the power supply of the electric drive system;

[0010] S5, placing an antenna for detecting noise at a position with a human-set distance from the table edge after the working condition is stable;

[0011] S6, comparing the result of the antenna receiver with a reference value, if the result is lower than the required value, the background noise requirement is met, and if the result is higher than the required value, the background noise requirement is not met.

[0012] Further, in step S1, the electric drive system is arranged in the electromagnetic compatibility darkroom, and the specific method is,

[0013] A test table is arranged in the electromagnetic compatibility darkroom, a rack is arranged on one side of the test table, a motor is arranged on the rack, a rotating shaft of the motor is connected with a rotating shaft of a dynamometer through a coupling, a high-voltage artificial network is arranged on a tabletop of the test table away from the rack, a motor controller is connected with the high-voltage artificial network through a high-voltage DC bus, and the battery simulator and the dynamometer are arranged outside the electromagnetic compatibility darkroom.

[0014] Further, in step S2, the motor controller is connected with the battery simulator through the high-voltage artificial network, and the specific method is,

[0015] The motor controller is connected with the high-voltage artificial network through the high-voltage DC bus.

[0016] A value rectifier bridge circuit is arranged in the motor controller, and alternating current output by the motor is converted into direct current through the rectifier bridge circuit to feed the battery simulator.

[0017] Further, a high-voltage artificial network shielding box is arranged outside the high-voltage artificial network, a high-voltage line shielding box is arranged outside the high-voltage DC bus, a controller housing is arranged outside the motor controller, a motor housing is arranged outside the motor, and the artificial network shielding box, the high-voltage line shielding box, the controller housing and the motor housing are sequentially and sealingly connected.

[0018] Further, in step S2, a filter is arranged between the high-voltage artificial network and the battery simulator, and the filter is arranged outside the electromagnetic compatibility darkroom.

[0019] Further, in step S3, the speed is artificially set as 50% of the rated speed.

[0020] Further, in step S5, the distance is artificially set as 900 mm, the antenna is arranged inside the electromagnetic compatibility darkroom, and an antenna receiver corresponding to the antenna is arranged outside the electromagnetic compatibility darkroom.

[0021] Further, in step S6, the reference value is an artificially set value or is selected according to an electromagnetic compatibility test standard value; and the requirement value is 6 dB.

[0022] Compared with the prior art, the electric drive rack background noise verification method for the electromagnetic compatibility darkroom has the following beneficial effects:

[0023] (1) The electromagnetic compatibility darkroom electric drive platform background noise verification method provided by the application has the advantages that a complete electric drive system is arranged, the electric drive system is combined with a dynamometer and a battery simulator, the electric drive system is in a loaded condition, and background noise testing is performed, so that the result is more real, accurate and effective.

[0024] (2) The electromagnetic compatibility darkroom electric drive platform background noise verification method provided by the application has the advantages that a complete electric drive system is arranged, the electric drive system is combined with a dynamometer and a battery simulator, the electric drive system is in a loaded condition, and background noise testing is performed, so that the result is more real, accurate and effective. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the illustrative embodiments of the present application and their descriptions, and do not constitute improper limitations on the present application. In the drawings:

[0026] Figure 1 A schematic diagram of the electromagnetic compatibility darkroom electric drive platform background noise verification method according to an embodiment of the application is shown in the figure.

[0027] Figure 2 A schematic diagram of the rectifier bridge circuit according to an embodiment of the application is shown in the figure. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0032] As shown in Figure 1 , a method for verifying background noise of an electric drive platform in an electromagnetic compatibility darkroom, the specific steps are as follows:

[0033] S1, arranging an electric drive system in an electromagnetic compatibility darkroom, the electric drive system comprising an electric motor, and the shaft of the electric motor is connected with the shaft of a dynamometer;

[0034] S2, connecting the electric motor controller with a battery simulator through a high-voltage artificial network;

[0035] S3, setting a speed of the dynamometer artificially, so that the dynamometer drives the electric motor to rotate at a stable speed;

[0036] S4, adjusting the battery simulator to a load mode to absorb the power supply of the electric drive system;

[0037] S5, placing an antenna for detecting noise at a position with an artificial distance from the table edge after the working condition is stable;

[0038] S6, comparing the result of the antenna receiver with a reference value, if the result is lower than the required value, the background noise requirement is met, if the result is higher than the required value, the background noise requirement is not met.

[0039] As shown in Figure 1 , in step S1, the electric drive system is arranged in the electromagnetic compatibility darkroom, and the specific method is as follows:

[0040] A test table is arranged in the electromagnetic compatibility darkroom, a platform is arranged on one side of the test table, an electric motor is arranged on the platform, the rotating shaft of the electric motor is connected with the rotating shaft of a dynamometer through a coupling, a high-voltage artificial network is arranged on the far side of the tabletop of the test table, a high-voltage DC bus is connected between the electric motor controller and the high-voltage artificial network, and the battery simulator and the dynamometer are arranged outside the electromagnetic compatibility.

[0041] As shown in Figure 1 , Figure 2 , in step S2, the electric motor controller is connected with the battery simulator through the high-voltage artificial network, and the specific method is as follows:

[0042] The motor controller is connected with the high-voltage artificial network through a high-voltage DC bus;

[0043] The motor controller is provided with a value rectifier bridge circuit, which converts the AC power output by the motor into DC power through the rectifier bridge circuit and feeds the battery simulator.

[0044] The rectifier bridge circuit comprises diodes VD1, VD2, VD3, VD4, VD5 and VD6, the diodes VD1 and VD4 are connected in series, the diodes VD2 and VD5 are connected in series, and the diodes VD3 and VD6 are connected in series, the cathodes of the diodes VD1, VD2 and VD3 are connected to a point to form an output terminal one, the anodes of the diodes VD4, VD5 and VD6 are connected to a point to form an output terminal two, the output terminal one and the output terminal two cooperate to output DC power, and the anodes of the diodes VD1, VD2 and VD3 are provided with three connection wires respectively connected to three-phase lines of the motor.

[0045] The UA, UB and UC are three-phase line voltages of the motor, and the diodes VD1, VD2, VD3, VD4, VD5 and VD6 rectify the three-phase line voltages to output DC power to feed the battery simulator.

[0046] As shown in Figure 1 The high-voltage artificial network is provided with a high-voltage artificial network shielding box outside, the high-voltage DC bus is provided with a high-voltage line shielding box outside, the motor controller is provided with a controller housing outside, the motor is provided with a motor housing outside, and the artificial network shielding box, the high-voltage line shielding box, the controller housing and the motor housing are sequentially and sealingly connected.

[0047] As shown in Figure 1 In step S2, a filter is arranged between the high-voltage artificial network and the battery simulator, and the filter is arranged outside the electromagnetic compatibility darkroom.

[0048] As shown in Figure 1 In step S3, the speed is artificially set to be 50% of the rated speed.

[0049] As shown in Figure 1 In step S5, the distance is artificially set to be 900 mm, the antenna is arranged inside the electromagnetic compatibility darkroom, and the antenna receiver corresponding to the antenna is arranged outside the electromagnetic compatibility darkroom.

[0050] The antenna receiver is of the ESU26 type.

[0051] As shown in Figure 1 In step S6, the reference value is an artificially set value or is selected according to the electromagnetic compatibility test standard value; and the requirement value is 6 dB.

[0052] The electromagnetic compatibility test standard is GB / T 18655.

[0053] By setting a complete electric drive system, combining the electric drive system with the dynamometer and the battery simulator, and making the electric drive system under the load condition, the background noise test is carried out, and the result is more real, accurate and effective.

[0054] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for verifying background noise of an electrically driven test bench in an electromagnetic compatibility anechoic chamber, characterized in that: The specific steps are as follows: S1. An electric drive system is installed in an electromagnetic compatibility anechoic chamber. The motor drive system includes a motor, and the motor shaft is connected to the dynamometer shaft. S2. Connect the motor controller to the battery simulator via a high-voltage artificial network; S3. Given a manually set rotational speed of the dynamometer, the dynamometer drives the motor to rotate at a stable speed; S4, the battery simulator is switched to load mode to absorb power from the electric drive system; S5. After the operating conditions stabilize, place the antenna used for noise detection at a distance from the edge of the table that is manually set. S6. Compare the results of the antenna receiver with the reference value. If the result is lower than the required value, it meets the background noise requirement. If the result is higher than the required value, it does not meet the background noise requirement. In step S1, the electric drive system is installed in the electromagnetic compatibility anechoic chamber. The specific method is as follows: A test table is set up in an electromagnetic compatibility anechoic chamber, and a frame is set up on one side of the test table. A motor is set up on the frame, and the motor shaft is connected to the dynamometer shaft through a coupling. A high-voltage artificial network is set up on the side of the test table away from the table. The motor controller is connected to the high-voltage artificial network through a high-voltage DC bus. The battery simulator and dynamometer are both set up outside the electromagnetic compatibility chamber. In step S2, the motor controller is connected to the battery simulator via a high-voltage artificial network. The specific method is as follows: The motor controller is connected to the high-voltage artificial network via a high-voltage DC bus. The motor controller has a built-in rectifier bridge circuit, which converts the AC power output from the motor into DC power to feed the battery simulator. A high-voltage artificial network shielding box is installed on the outside of the high-voltage artificial network, a high-voltage line shielding box is installed on the outside of the high-voltage DC bus, a controller housing is installed on the outside of the motor controller, and a motor housing is installed on the outside of the motor. The artificial network shielding box, the high-voltage line shielding box, the controller housing, and the motor housing are sequentially and sealed together. In step S6, the reference value is either manually set or selected based on the electromagnetic compatibility test standard value; the required value is 6dB.

2. The method for verifying background noise of an electrically driven test bench in an electromagnetic compatibility anechoic chamber according to claim 1, characterized in that: In step S2, a filter is provided between the high-voltage artificial network and the battery simulator, and the filter is located outside the electromagnetic compatibility dark room.

3. The method for verifying background noise of an electrically driven test bench in an electromagnetic compatibility anechoic chamber according to claim 1, characterized in that: In step S3, the rotational speed is manually set to 50% of the rated speed.

4. The method for verifying background noise of an electrically driven test bench in an electromagnetic compatibility anechoic chamber according to claim 1, characterized in that: In step S5, the distance is manually set to 900mm, the antenna is placed inside the electromagnetic compatibility anechoic chamber, and the antenna receiver corresponding to the antenna is placed outside the electromagnetic compatibility anechoic chamber.

Images