A pair of test benches for electric drive electromagnetic compatibility performance test

Abstract

The utility model relates to a kind of for the electromagnetic compatibility of electric drive test is pulled to platform, including first rack, second rack and third rack, the first rack includes first pedestal, first dynamometer, second dynamometer, gear box and first shielding device, gear box opposite side is respectively provided with two input shaft and three output shaft, the output shaft of first, second dynamometer respectively with the input shaft of gear box is connected;Second rack includes second pedestal, third dynamometer and second shielding device;Third rack includes third pedestal, first connecting shaft system, second connecting shaft system, third connecting shaft system and fourth connecting shaft system, first connecting shaft system, second connecting shaft system, third connecting shaft system respectively with the output shaft of gear box is connected, the output shaft of fourth connecting shaft system is connected with third dynamometer, for electromagnetic compatibility test to three output shaft electric drive system.

Description

Technical Field

[0001] This utility model relates to the field of motor performance testing technology, specifically to a drag test stand for testing the electromagnetic compatibility performance of electric drives. Background Technology

[0002] Electromagnetic compatibility (EMC) performance test benches are part of anechoic chamber laboratories and are used to test the EMC performance of motors. Existing EMC test benches typically consist of three parts: an anechoic chamber bench, a first anechoic chamber bench, and a second anechoic chamber bench. These parts are connected by a transmission system to transmit power, which must pass through the electromagnetically shielded metal walls of the anechoic chamber. Typically, the transmission system of the bench consists of a dynamometer, torque sensor, coupling, bearing unit, through-wall shaft assembly, and constant velocity universal joint, among other components.

[0003] In the existing technology, the electromagnetic compatibility (EMC) performance test benches for towing are only designed for traditional test samples, i.e., the test sample has one output shaft on each side and the two output shafts are coaxially set. Currently, there is no EMC performance test bench for towing samples with three output shafts (i.e., the test sample has one output shaft on one side and two output shafts on the other side, one of which is coaxially set with the output shaft on the other side).

[0004] Meanwhile, for test pieces with three output shafts, the arrangement of the two output shafts on the side with two output shafts varies depending on the vehicle design requirements. For example, the output shaft on the other side may remain coaxial with the other output shaft, while the position of the other shaft relative to the coaxial shaft may be swapped in the left-right direction. To address this, this invention proposes a drag-and-drop electromagnetic compatibility test bench for test pieces with three output shafts. Utility Model Content

[0005] The purpose of this invention is to provide a test bench for testing the electromagnetic compatibility (EMC) performance of electric drives, specifically for testing the EMC of three-output shaft electric drive systems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A test bench for testing the electromagnetic compatibility performance of electric drives includes a first bench, a second bench, and a third bench, wherein the first bench and the second bench are located on opposite sides of the third bench; wherein,

[0008] The first frame includes a first base and a first dynamometer, a second dynamometer, a gearbox, and a first shielding device mounted on the first base. The gearbox is a dual-input, three-output gearbox, with two input shafts and three output shafts respectively arranged on its opposite sides. The output shafts of the first dynamometer and the second dynamometer are respectively connected to one of the input shafts of the gearbox.

[0009] The second frame includes a second base and a third dynamometer and a second shielding device mounted on the second base;

[0010] The third frame includes a third base and a first connecting shaft system, a second connecting shaft system, a third connecting shaft system and a fourth connecting shaft system mounted on the third base. The third base has a fixed area in the middle for placing the sample to be tested. The first connecting shaft system, the second connecting shaft system and the third connecting shaft system are located on the side of the fixed area facing the first frame, and the fourth connecting shaft system is located on the side of the fixed area facing the second frame.

[0011] The first connecting shaft system, the second connecting shaft system, and the third connecting shaft system are respectively connected to one of the output shafts of the gearbox, and the fourth connecting shaft system is connected to the output shaft of the third dynamometer.

[0012] In one embodiment, the three output shafts of the gearbox are arranged in parallel and side by side, with the middle shaft being the low-speed output shaft and the shafts on both sides being the high-speed output shafts. The low-speed output shaft is the same shaft as one of the input shafts.

[0013] In one embodiment, the first connecting shaft system is connected to the low-speed output shaft, and the first connecting shaft system and the low-speed output shaft are in the same transmission shaft system. The second connecting shaft system and the third connecting shaft system are located on opposite sides of the first connecting shaft system and are respectively connected to one of the high-speed output shafts.

[0014] In one embodiment, the first connecting shaft system includes a first low-speed bearing unit, a first connecting shaft, and a second low-speed bearing unit. The low-speed output shaft is connected to the first connecting shaft via the first low-speed bearing unit, and the first connecting shaft is connected to the first sample connecting shaft of the sample to be tested via the second low-speed bearing unit.

[0015] In one embodiment, both the second and third connecting shaft systems include a first high-speed bearing unit, a second connecting shaft, a second high-speed bearing unit, a second sample connecting shaft, and a third high-speed bearing unit. The high-speed output shaft is connected to the second connecting shaft via the first high-speed bearing unit. The second connecting shaft is connected to the second sample connecting shaft of the sample under test via the second high-speed bearing unit. The second sample connecting shaft is connected to the sample under test via the third high-speed bearing unit.

[0016] In one embodiment, the second high-speed bearing unit is fixed to the third base by a fixed support, which is movable along the length, width and height of the third base.

[0017] In one embodiment, the second high-speed bearing unit has rotational degrees of freedom relative to the three axes of the fixed support.

[0018] In one embodiment, the fourth connecting shaft system includes a third low-speed bearing unit, a third connecting shaft, a fourth low-speed bearing unit, a fourth connecting shaft, and a fifth low-speed bearing unit. The third connecting shaft is connected to the output shaft of the third dynamometer via the third low-speed bearing unit. The third connecting shaft is connected to the fourth connecting shaft via the fourth low-speed bearing unit. The fourth connecting shaft is connected to the third sample connecting shaft of the sample to be tested via the fifth low-speed bearing unit.

[0019] In one embodiment, the fifth low-speed bearing unit is slidably fixed to the third base along the axial direction.

[0020] In one embodiment, the first frame, the second frame, and the third frame all include couplings, the output shafts of the first dynamometer and the second dynamometer are connected to one of the input shafts of the gearbox via the couplings, the output shaft of the third dynamometer is connected to the fourth connecting shaft system via the couplings, and the couplings are equipped with torque sensors.

[0021] In one embodiment, the drag frame further includes a first anechoic chamber, a second anechoic chamber, and a dark chamber, wherein the first frame, the second frame, and the third frame are respectively installed in the first anechoic chamber, the second anechoic chamber, and the dark chamber.

[0022] The present invention adopts the above-mentioned technical solution and has the following advantages: the drag frame provided by the present invention directly uses two dynamometers to drive a dual-input three-output gearbox, and the connection between the high-speed and low-speed shafts can be realized with one gearbox, which is simpler in structure and relatively lower in cost. Attached Figure Description

[0023] Figure 1 A schematic diagram of the drag table is shown.

[0024] Figure 2 A schematic diagram of the first frame is shown.

[0025] Figure 3 A schematic diagram of the second rack is shown.

[0026] Figure 4 A schematic diagram of the third rack is shown. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are only for illustrating the essential spirit of the technical solution of the present invention.

[0028] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0029] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0030] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0031] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0032] In the following description, in order to clearly demonstrate the structure and working method of this utility model, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0033] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] like Figure 1-4 As shown, this embodiment provides a pair of test stands for testing the electromagnetic compatibility performance of electric drives. The pair of test stands includes a first stand 11, a second stand 21 and a third stand 31. The first stand 11 and the second stand 21 are located on opposite sides of the third stand 31, and the first stand 11, the second stand 21 and the third stand 31 are respectively installed in a first anechoic chamber 1, a second anechoic chamber 2 and a dark chamber 3.

[0036] See Figure 2 The first frame 11 includes a first base 110 and a first dynamometer 111, a second dynamometer 112, a gearbox 113, and a first shielding device 114 mounted on the first base 110. The gearbox 113 is a dual-input, three-output gearbox, with two input shafts 1131 and three output shafts respectively arranged on opposite sides. The first dynamometer 111 and the second dynamometer 112 are arranged side by side, and the output shafts of the first dynamometer 111 and the second dynamometer 112 are respectively connected to one of the input shafts of the gearbox 113 through a coupling. All three output shafts of the gearbox 113 pass through the first shielding device 114 and extend into the dark chamber 3 to connect with the corresponding connecting shaft system on the third frame 31.

[0037] The middle shaft of the three output shafts of gearbox 113 is the low-speed output shaft 1132a, which shares the same shaft as one of the input shafts and is driven by the second dynamometer 112. The output shafts opposite to the low-speed output shaft 1132a are the high-speed output shafts 1132b, which have the same output speed. The transmission ratio between the high-speed output shaft and the other input shaft can be set arbitrarily according to actual needs, and the number of transmission stages is not limited. Under normal operation, only one of the two high-speed output shafts is engaged, and the high-speed output shaft 1132b is driven by the first dynamometer 111. The dual-input, three-output gearbox configuration allows for a smaller shaft spacing between the three output shafts, resulting in a compact overall structure. This solves the problem of excessive shaft spacing between dynamometers when two dynamometers are arranged side-by-side, which prevents them from adapting to smaller shaft spacing of the sample. Furthermore, in this embodiment, the drag frame is directly driven by two dynamometers to a single dual-input, three-output gearbox, meaning that the connection between the high-speed and low-speed shafts can be achieved with a single gearbox, resulting in a simpler structure and relatively lower cost.

[0038] See Figure 3 The second frame 21 includes a second base 210 and a third dynamometer 211, a first coupling 212, and a second shielding device 213 mounted on the second base 210. The output shaft of the third dynamometer 211 is connected to the corresponding connecting shaft system on the third frame 31 through the first coupling 212 and the second shielding device 213.

[0039] See Figure 4 The third frame 31 includes a third base 310 and a first connecting shaft system, a second connecting shaft system, a third connecting shaft system, and a fourth connecting shaft system mounted on the third base 310. The third base 310 has a fixed area in its center for placing the sample 4 to be tested. The first, second, and third connecting shaft systems are distributed on the side of the fixed area facing the first frame 11 and are each fixed by a corresponding bearing unit. The fourth connecting shaft system is distributed on the side of the fixed area facing the second frame 21 and is fixed by a corresponding bearing unit.

[0040] The first connecting shaft system is connected to the low-speed output shaft 1132a. The first connecting shaft system includes a first low-speed bearing unit 3111, a first connecting shaft 3112, and a second low-speed bearing unit 3113. The low-speed output shaft 1132a is connected to the first connecting shaft 3112 via the first low-speed bearing unit 3111. The first connecting shaft 3112 is connected to the first sample connecting shaft 41 via the second low-speed bearing unit 3113. The first sample connecting shaft 41 is then connected to the low-speed shaft corresponding to the sample 4 under test. The second and third connecting shaft systems have the same structure and are distributed on opposite sides of the first connecting shaft system. Both the second and third connecting shaft systems include a first high-speed bearing unit 3121, a second connecting shaft 3122, a second high-speed bearing unit 3123, a second sample connecting shaft 42, and a third high-speed bearing unit 3124. The high-speed output shaft 1132b is connected to the second connecting shaft 3122 via the first high-speed bearing unit 3121. The second connecting shaft 3122 is connected to the second sample connecting shaft 42 via the second high-speed bearing unit 3123. The second sample connecting shaft 42 is then connected to the corresponding high-speed shaft of the sample under test 4 via the third high-speed bearing unit 3124. The first sample connecting shaft 41 is usually part of the sample under test and is generally provided by the sample under test. However, it can also be designed separately to match the sample under test according to the test requirements. In other words, in some cases, the first sample connecting shaft 41 can also be part of the corresponding first connecting shaft system. The installation position of the third high-speed bearing unit 3124 is usually close to the sample under test 4 to facilitate docking. The sample under test 4 can dock with the third high-speed bearing unit 3124 through internal or external splines, flat keys, expansion joints, or other structures.

[0041] See Figure 4Two first high-speed bearing units 3121 and one first low-speed bearing unit 3111 are arranged in parallel and side by side. The three bearing units can be made into an integrated structure as needed, or two of them can be integrated and the other can be independent, or they can be independent structures as shown in this application. The two first high-speed bearing units 3121 have the same output speed. Under normal operation, only one of the two first high-speed bearing units 3121 is engaged.

[0042] Two second high-speed bearing units 3123 are movably fixed to the third base 310 via fixed supports. The fixed supports can move along the length, width, and height of the third base 310. The second high-speed bearing units 3123 can achieve six degrees of freedom of spatial position adjustment through translational freedom in three directions and rotational freedom around three axes, thus connecting with the high-speed input shaft of the test sample 4. Furthermore, the spatial position adjustment of the two second high-speed bearing units 3123 can adapt to the installation size requirements of different test samples. In the transmission connection of the high-speed shaft, by adjusting the spatial position of the two second high-speed bearing units 3123, as well as the length and transmission angle of the second connecting shaft 3122 and the second sample connecting shaft 42, the second connecting shaft 3122 and the second sample connecting shaft 42 can operate in the best performance state. Since the second connecting shaft 3122 and the second sample connecting shaft 42 generally have installation length and transmission angle limitations at both ends, exceeding the allowable installation length or angle limits will damage or destroy the connecting shafts. In addition, the second connecting shaft 3122 and the second sample connecting shaft 42 can be replaced as needed to adapt to the installation size requirements of different samples.

[0043] See also Figure 4 The fourth connecting shaft system is used to connect the output shaft of the third dynamometer 211. This fourth connecting shaft system includes a third low-speed bearing unit 3131, a third connecting shaft 3132, a fourth low-speed bearing unit 3133, a fourth connecting shaft 3134, and a fifth low-speed bearing unit 3135. One end of the third connecting shaft 3132 is connected to the coupling of the second frame 21 via the third low-speed bearing unit 3131. The other end of the third connecting shaft 3132 is connected to one end of the fourth connecting shaft 3134 via the fourth low-speed bearing unit 3133. The other end of the fourth connecting shaft 3134 is connected to one end of the third sample connecting shaft 43 via the fifth low-speed bearing unit 3135. The other end of the third sample connecting shaft 43 is connected to the corresponding shaft of the sample under test 4. The third sample connecting shaft 43 is usually also part of the sample under test and is generally provided by the sample under test. However, it can also be designed separately to match the sample under test according to the testing requirements. In other words, in some cases, the third sample connecting shaft 43 can also be part of the fourth connecting shaft system.

[0044] In this embodiment, the fifth low-speed bearing unit 3135 is axially slidably fixed on the third base 310, so that the distance between the fifth low-speed bearing unit 3135 and the second low-speed bearing unit 3113 can be adjusted. At the same time, the fourth connecting shaft 3134 can be extended or retracted in length and the transmission angle at both ends can be adjusted, or different connecting shafts can be directly replaced to adapt to the axial installation dimensions of different test samples.

[0045] In this embodiment, torque sensors are respectively installed on the couplings connected to the first dynamometer 111, the second dynamometer 112, and the third dynamometer 211. Since the three output shafts of the sample under test are respectively connected to the first dynamometer 111, the second dynamometer 112, and the third dynamometer 211 through one of the first connecting shaft system, the second connecting shaft system, and the third connecting shaft system, as well as the fourth connecting shaft system, the power output and torque characteristics of each output shaft of the drive motor of the sample under test can be tested.

[0046] The preferred embodiments of this utility model have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to this utility model. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A test bench for testing the electromagnetic compatibility performance of electric drives, characterized in that, It includes a first frame, a second frame, and a third frame, with the first frame and the second frame located on opposite sides of the third frame; wherein, The first frame includes a first base and a first dynamometer, a second dynamometer, a gearbox, and a first shielding device mounted on the first base. The gearbox is a dual-input, three-output gearbox, with two input shafts and three output shafts respectively arranged on its opposite sides. The output shafts of the first dynamometer and the second dynamometer are respectively connected to one of the input shafts of the gearbox. The second frame includes a second base and a third dynamometer and a second shielding device mounted on the second base; The third frame includes a third base and a first connecting shaft system, a second connecting shaft system, a third connecting shaft system and a fourth connecting shaft system mounted on the third base. The third base has a fixed area in the middle for placing the sample to be tested. The first connecting shaft system, the second connecting shaft system and the third connecting shaft system are located on the side of the fixed area facing the first frame, and the fourth connecting shaft system is located on the side of the fixed area facing the second frame. The first connecting shaft system, the second connecting shaft system, and the third connecting shaft system are respectively connected to one of the output shafts of the gearbox, and the fourth connecting shaft system is connected to the output shaft of the third dynamometer.

2. The drag-and-drop platform as described in claim 1, characterized in that, The gearbox has three output shafts arranged in parallel and side by side. The shaft in the middle is the low-speed output shaft, and the shafts on both sides are the high-speed output shafts. The low-speed output shaft is the same shaft as one of the input shafts.

3. The drag-and-drop platform as described in claim 2, characterized in that, The first connecting shaft system is connected to the low-speed output shaft, and the first connecting shaft system and the low-speed output shaft are in the same transmission shaft system. The second connecting shaft system and the third connecting shaft system are located on opposite sides of the first connecting shaft system, and are respectively connected to one of the high-speed output shafts.

4. The drag-and-drop platform as described in claim 3, characterized in that, The first connecting shaft system includes a first low-speed bearing unit, a first connecting shaft, and a second low-speed bearing unit. The low-speed output shaft is connected to the first connecting shaft through the first low-speed bearing unit, and the first connecting shaft is connected to the first sample connecting shaft of the sample to be tested through the second low-speed bearing unit.

5. The drag-and-drop platform as described in claim 3, characterized in that, Both the second and third connecting shaft systems include a first high-speed bearing unit, a second connecting shaft, a second high-speed bearing unit, a second sample connecting shaft, and a third high-speed bearing unit. The high-speed output shaft is connected to the second connecting shaft through the first high-speed bearing unit. The second connecting shaft is connected to the second sample connecting shaft of the sample to be tested through the second high-speed bearing unit. The second sample connecting shaft is connected to the sample to be tested through the third high-speed bearing unit.

6. The drag-and-drop platform as described in claim 5, characterized in that, The second high-speed bearing unit is fixed to the third base by a fixed support, which is movable along the length, width and height of the third base.

7. The drag-and-drop platform as described in claim 6, characterized in that, The second high-speed bearing unit has rotational degrees of freedom relative to the three axes of the fixed support.

8. The drag-and-drop platform as described in claim 1, characterized in that, The fourth connecting shaft system includes a third low-speed bearing unit, a third connecting shaft, a fourth low-speed bearing unit, a fourth connecting shaft, and a fifth low-speed bearing unit. The third connecting shaft is connected to the output shaft of the third dynamometer through the third low-speed bearing unit. The third connecting shaft is connected to the fourth connecting shaft through the fourth low-speed bearing unit. The fourth connecting shaft is connected to the third sample connecting shaft of the sample to be tested through the fifth low-speed bearing unit.

9. The drag-and-drop platform as described in claim 8, characterized in that, The fifth low-speed bearing unit is fixed to the third base and can slide axially.

10. The drag-and-drop platform as described in claim 1, characterized in that, The first frame, the second frame, and the third frame all include couplings. The output shafts of the first dynamometer and the second dynamometer are connected to one of the input shafts of the gearbox through the couplings. The output shaft of the third dynamometer is connected to the fourth connecting shaft system through the couplings. The couplings are equipped with torque sensors.

11. The drag-and-drop platform as described in claim 1, characterized in that, The drag frame also includes a first anechoic chamber, a second anechoic chamber, and a dark chamber, with the first frame, the second frame, and the third frame respectively installed in the first anechoic chamber, the second anechoic chamber, and the dark chamber.

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