Connecting structure of motor testing device

Abstract

The embodiment of the utility model discloses a connecting structure of a motor testing device. The connecting structure comprises a connecting cylinder, a limiting block, a connecting shaft and a spline housing, the connecting cylinder is used for being connected with a dynamometer, the connecting shaft comprises a middle section, a connecting section and a testing section, the connecting section and the testing section are located at the two ends of the middle section respectively, and the connecting cylinder is arranged on the outer side of the connecting section in a sleeving mode and connected with an outer spline on the connecting section through an inner spline. The connecting section and the connecting cylinder are in sliding fit in the axis direction of the connecting shaft, and the end of the connecting section and the inner end face, opposite to the end of the connecting section, of the connecting cylinder are spaced by a set distance. The spline housing is detachably installed on the test section. According to the embodiment of the invention, the transmission fit between the connecting shaft and the dynamometer can be realized through the spline fit between the connecting cylinder and the connecting section, and the sliding fit between the connecting shaft and the connecting cylinder in the axial direction can also be realized, so that the whole process is simpler and more efficient.

Description

Technical Field

[0001] This application relates to the field of motor testing technology, and in particular to a connection structure for a motor testing device. Background Technology

[0002] With the continuous development of electric vehicles, higher demands are being placed on motor performance, leading to increased motor testing needs. In single-motor testing, a connecting shaft is often used to connect the motor under test (DUT) and the dynamometer. Currently, once installed, this connecting shaft cannot be removed without disassembling the DUT. However, in actual testing, some tests require disconnecting the connecting shaft, or the dynamometer needs periodic calibration. In these cases, the DUT must be disassembled before the connecting shaft can be removed, resulting in significant DUT disassembly and reassembly work. Furthermore, because different motors have different dimensions, the connecting shaft dimensions are not interchangeable, affecting testing efficiency and timeliness. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a connection structure for a motor testing device to improve the efficiency of motor testing.

[0004] This application provides a connection structure for a motor testing device, including: a connecting cylinder, a limiting block, a connecting shaft, and a spline sleeve;

[0005] The connecting cylinder is used to connect the dynamometer. The connecting shaft includes an intermediate section and connecting sections and test sections located at both ends of the intermediate section. The connecting cylinder is sleeved on the outside of the connecting section and connected to the external spline on the connecting section through an internal spline. The connecting section and the connecting cylinder are slidably engaged along the axial direction of the connecting shaft. A set distance is spaced between the end of the connecting section and the inner end face of the connecting cylinder and its opposite side. The set distance is greater than the length of the test section. The limiting block is installed on the connecting cylinder and engages with the connecting section for limiting.

[0006] The spline sleeve is detachably mounted on the test section and is connected to the external spline on the test section via an internal spline. The external spline of the spline sleeve is used to connect to the motor under test.

[0007] Based on the motor testing device's connection structure, the splined fit between the connecting cylinder and the connecting section enables not only the transmission between the connecting shaft and the dynamometer but also axial sliding fit. The inner spline of the connecting cylinder and the outer spline of the connecting section form multiple sliding blocks and grooves, ensuring the stability of the connecting shaft during sliding and maintaining their coaxiality. This prevents situations where the connecting shaft, after sliding into the connecting cylinder and detaching from the tested motor, cannot be re-inserted after replacing the tested motor. The entire process is simpler and more efficient. Furthermore, the motor testing device's connection structure can quickly adapt to more specifications of tested motors through the splined sleeve. The connecting shaft does not need to be replaced; only a splined sleeve with a compatible outer spline needs to be replaced according to the corresponding tested motor. It should be understood that the splined fit between the splined sleeve and the testing section also significantly improves the reliable transmission stability of the connecting shaft and splined sleeve during the testing of the tested motor.

[0008] In one embodiment of the motor testing device connection structure described above, the motor testing device connection structure further includes an elastic element, the two ends of which are respectively connected to the end of the connecting section and the inner end face of the connecting cylinder, and the length of the elastic element in the axial direction of the connecting shaft is greater than or equal to the set distance.

[0009] Furthermore, based on the aforementioned elastic element, when the connecting shaft moves toward the inner end face of the connecting cylinder, the elasticity of the elastic element can be used to make the connecting shaft tend to move toward the motor under test. At the same time, the setting of the elastic element can also be used to make the test section of the connecting shaft stably connected with the motor under test when the connecting shaft is connected to the motor under test.

[0010] In one embodiment of the above-described motor testing device connection structure, the elastic element is a cylindrical spring, and the length of the elastic element is greater than the set distance.

[0011] Furthermore, based on the aforementioned elastic element, the connecting shaft can always receive an elastic force in the direction of the motor under test. The elastic element can act as an elastic limiting element for the connecting shaft in the axial direction, significantly improving the stability of the connecting shaft in the axial direction and ensuring the stability of the test section when connected to the motor under test.

[0012] In one embodiment of the above-mentioned motor testing device connection structure, a first chamfer structure is provided at the connection between the intermediate section and the connecting section, and a second chamfer structure is provided on the limiting block to slide in cooperation with the first chamfer structure.

[0013] Furthermore, based on the aforementioned connection shaft and limiting block configuration, the limiting block utilizes a second chamfer structure to axially limit the connection segment. When the connection shaft rotates, the limiting block can utilize a sliding fit to provide bidirectional support to the connection shaft in both the radial and axial directions. The limiting block increases the contact area with the connection shaft, significantly improving the support and limiting effect.

[0014] In one embodiment of the motor testing device connection structure described above, the inner peripheral side of the limiting block is an arc-shaped support surface, and the arc-shaped support surface slides in cooperation with at least a portion of the outer peripheral side of the intermediate section.

[0015] Furthermore, based on the aforementioned limiting block, the arc-shaped support surface can be used to provide radial support for the connecting shaft, thereby further improving the stability of the connecting shaft during rotation.

[0016] In one embodiment of the above-described motor testing device connection structure, the external spline dimensions on both the connection segment and the test segment are the same.

[0017] Furthermore, based on the aforementioned connecting section and test section, the two ends of the connecting shaft can be interchanged at will. That is to say, the connecting section can be connected to the motor under test or the dynamometer, and the test section can also be connected to the motor under test or the dynamometer.

[0018] In one embodiment of the above-mentioned motor testing device connection structure, the connecting cylinder is provided with a connecting flange coaxially arranged therewith, and the connecting flange has a plurality of bolt holes for connecting the dynamometer evenly arranged along the circumference.

[0019] Furthermore, based on the aforementioned connecting flange and bolt holes, the connection reliability between the connecting cylinder and the dynamometer can be improved. In addition, the diameter of the connecting flange is larger than the diameter of the connecting cylinder, and the bolt holes are located at the outer edge of the connecting flange, that is, at a position far away from the axis of the connecting flange. This arrangement can significantly increase the torque that the connecting cylinder and the connecting flange can withstand.

[0020] In one embodiment of the above-described motor testing device connection structure, the spline sleeve includes a spline segment sleeved on the outside of the test segment and a limiting plate disposed opposite to the end of the test segment.

[0021] Furthermore, based on the aforementioned limiting plate, the spline sleeve and the test section can form an axial limit, and after the spline sleeve is inserted into the motor under test, the end of the test section and the motor under test are pressed in the middle, achieving axial limit on both sides, thereby stably fixing it between the motor under test and the test section.

[0022] In one embodiment of the above-described motor testing device connection structure, the limiting plate is detachably connected to the end of the test section via a first connection structure.

[0023] Furthermore, based on the above-mentioned first connection structure, the connection stability between the spline sleeve and the test section can be further improved.

[0024] In one embodiment of the above-mentioned motor testing device connection structure, a third chamfer structure is provided on the outer periphery of the end of the test section, and a fourth chamfer structure is provided at the connection between the limiting plate and the spline section, which fits in close contact with the third chamfer structure.

[0025] Furthermore, based on the aforementioned third chamfer structure, not only can the test segment be easily inserted into the spline segment to achieve a guiding effect, but the fit between the third and fourth chamfer structures can also increase the contact area between the spline sleeve and the test segment, and achieve a bidirectional support effect in both the axial and radial directions, further improving the stability and reliability of the spline sleeve when it rotates with the test segment.

[0026] The above-described one or more embodiments of this application have at least one or more of the following beneficial effects:

[0027] The device not only enables the transmission between the connecting shaft and the dynamometer through the spline engagement between the connecting cylinder and the connecting section, but also allows for axial sliding engagement between the connecting shaft and the connecting cylinder. The inner spline of the connecting cylinder and the outer spline of the connecting section form multiple sliding blocks and grooves, ensuring the stability of the connecting shaft during sliding and the coaxiality of the two components. This prevents situations where the connecting shaft slides into the connecting cylinder and detaches from the motor under test, and then cannot be re-inserted into the motor under test after replacement. The entire process is simpler and more efficient. Furthermore, the connection structure of this motor testing device can quickly adapt to more specifications of motors under test through the spline sleeve. The connecting shaft does not need to be replaced; only a spline sleeve with a compatible outer spline needs to be replaced according to the corresponding motor under test. It should be understood that the spline engagement between the spline sleeve and the test section also significantly improves the reliable transmission stability of the connecting shaft and the spline sleeve during the testing of the motor under test.

[0028] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0029] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0030] Figure 1 This is a schematic diagram of the connection structure of the motor testing device described in this application embodiment when it is connected to the motor under test and the dynamometer;

[0031] Figure 2 This is a schematic diagram of the connecting shaft, limiting block, and spline sleeve in the connecting structure of the motor testing device described in the embodiments of this application.

[0032] Explanation of reference numerals in the attached figures

[0033] 1. Connecting cylinder; 11. Connecting flange; 111. Bolt hole; 2. Limiting block; 21. Second chamfer structure; 3. Connecting shaft; 31. Intermediate section; 32. Connecting section; 33. Test section; 34. First chamfer structure; 35. Third chamfer structure; 4. Spline sleeve; 41. Spline section; 42. Limiting plate; 43. Fourth chamfer structure; 5. Dynamometer; 6. Motor under test; 7. Elastic element. Detailed Implementation

[0034] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0035] In single-motor testing, a connecting shaft is often used to connect the motor under test (DUT) and the dynamometer. Currently, once installed, the connecting shaft cannot be removed without disassembling the DUT. However, in actual testing, some tests require disconnecting the connecting shaft, or the dynamometer needs to be calibrated and inspected periodically. In these cases, the connecting shaft can only be removed after the DUT is disassembled, resulting in a lot of work related to disassembling and reassembling the DUT. Furthermore, since different motors have different dimensions, the dimensions of the connecting shaft are not universal, affecting testing efficiency and timeliness.

[0036] Based on this, this application provides a motor testing device connection structure that, through the spline engagement between the connecting cylinder and the connecting section, not only enables the transmission engagement between the connecting shaft and the dynamometer, but also allows for axial sliding engagement between the connecting shaft and the connecting cylinder. The inner spline of the connecting cylinder and the outer spline of the connecting section form multiple sliding sliders and grooves, ensuring the stability of the connecting shaft during sliding and the coaxiality of the two components. This avoids the situation where, after the connecting shaft slides into the connecting cylinder and detaches from the motor under test, and the motor under test is replaced, it cannot be re-slid back into the motor under test. The entire process is simpler and more efficient. Furthermore, this motor testing device connection structure can quickly adapt to more specifications of motors under test through the spline sleeve. The connecting shaft does not need to be replaced; only a spline sleeve with an compatible outer spline needs to be replaced according to the corresponding motor under test. It should be understood that the spline engagement between the spline sleeve and the test section can also significantly improve the reliable transmission stability of the connecting shaft and the spline sleeve during the testing of the motor under test.

[0037] The present application will be described in detail below through specific embodiments.

[0038] Reference Figure 1 and Figure 2 As shown, this embodiment provides a motor testing device connection structure, including: a connecting cylinder 1, a limiting block 2, a connecting shaft 3, and a spline sleeve 4; the connecting cylinder 1 is used to connect a dynamometer 5, the connecting shaft 3 includes an intermediate section 31 and connecting sections 32 and test sections 33 located at both ends of the intermediate section 31, the connecting cylinder 1 is sleeved on the outside of the connecting section 32 and connected to the external spline on the connecting section 32 through an internal spline, the connecting section 32 and the connecting cylinder 1 slide in a sliding fit along the axial direction of the connecting shaft 3, the end of the connecting section 32 is spaced at a set distance from the inner end face of the connecting cylinder 1 and its opposite, the set distance is greater than the length of the test section 33, the limiting block 2 is installed on the connecting cylinder 1 and is in a limiting fit with the connecting section 32; the spline sleeve 4 is detachably installed on the test section 33 and connected to the external spline on the test section 33 through an internal spline, the external spline of the spline sleeve 4 is used to connect the motor 6 under test.

[0039] The motor testing device connection structure provided in this embodiment can achieve not only the transmission connection between the connecting shaft 3 and the dynamometer 5 through the spline engagement between the connecting cylinder 1 and the connecting section 32, but also the axial sliding connection between the connecting shaft 3 and the connecting cylinder 1. The inner spline of the connecting cylinder 1 and the outer spline of the connecting section 32 form multiple sliding sliders and grooves, ensuring the stability of the connecting shaft 3 during sliding and the coaxiality of the two. This avoids the situation where the connecting shaft 3 cannot be re-slid back into the tested motor 6 after sliding into the connecting cylinder 1 and disengaging from the tested motor 6 and replacing the tested motor 6. The whole process is simpler and more efficient. The motor testing device connection structure can also quickly adapt to more specifications of tested motors 6 through the setting of the spline sleeve 4. The connecting shaft 3 does not need to be replaced. Only the spline sleeve 4 with the matching outer spline needs to be replaced according to the corresponding tested motor 6. It should be understood that the spline engagement between the spline sleeve 4 and the test section 33 can also significantly improve the reliable transmission stability of the connecting shaft 3 and the spline sleeve 4 during the testing of the tested motor 6.

[0040] Continue to refer to Figure 1 As shown, the motor testing device connection structure also includes an elastic element 7. The two ends of the elastic element 7 are connected to the end of the connecting section 32 and the inner end face of the connecting cylinder 1, respectively. The inner end face of the connecting cylinder 1 refers to the end face of the connecting cylinder 1 and the end of the connecting section 32 that are opposite each other in the axial direction of the connecting shaft 3. The length of the elastic element 7 in the axial direction of the connecting shaft 3 is greater than or equal to a set distance. That is to say, when the connecting shaft 3 slides toward the inside of the connecting cylinder 1, it can compress the elastic element 7 and has a tendency to move toward the outside of the connecting cylinder 1. When the connecting section 32 is at the outer limit position inside the connecting cylinder 1 (the end of the connecting section 32 facing the test section 33 is flush with the opening of the connecting cylinder 1), the elastic element 7 is in a natural state or a compressed state.

[0041] Furthermore, based on the aforementioned elastic element 7, when the connecting shaft 3 moves toward the inner end face of the connecting cylinder 1, the elasticity of the elastic element 7 can be used to make the connecting shaft 3 tend to move toward the motor under test 6. At the same time, the setting of the elastic element 7 can also be used to make the test section 33 of the connecting shaft 3 stably connected with the motor under test 6 when the connecting shaft 3 is connected to the motor under test 6.

[0042] In some further embodiments, the elastic element 7 is a cylindrical spring, and the length of the elastic element 7 is greater than the set distance. It should be noted that when the elastic element 7 is compressed to the limit state, the sum of the length of the elastic element 7 and the length of the connecting section 32 is less than the length of the inner spline of the connecting cylinder 1, so as to ensure that the test section 33 can be completely separated from the tested motor 6.

[0043] Furthermore, based on the aforementioned elastic element 7, the connecting shaft 3 can always receive an elastic force in the direction of the motor under test 6. The elastic element 7 can serve as an elastic limiting element for the connecting shaft 3 in the axial direction, significantly improving the stability of the connecting shaft 3 in the axial direction and ensuring the stability of the test section 33 when connected to the motor under test 6.

[0044] In some embodiments, a first chamfer structure 34 is provided at the connection between the intermediate section 31 and the connecting section 32, and a second chamfer structure 21 is provided on the limiting block 2 to slide in cooperation with the first chamfer structure 34.

[0045] Furthermore, based on the above-mentioned connection shaft 3 and limiting block 2, the limiting block 2 uses the second chamfer structure 21 to axially limit the connection section 32. When the connection shaft 3 rotates, the limiting block 2 can use sliding fit to achieve bidirectional support for the connection shaft 3 in both the radial and axial directions. The limiting block 2 increases the contact area with the connection shaft 3, which significantly improves the support and limiting effect.

[0046] In some further embodiments, the inner peripheral side of the limiting block 2 is an arc-shaped support surface, which slides in conjunction with at least a portion of the outer peripheral side of the middle section 31.

[0047] Furthermore, based on the aforementioned limiting block 2, the arc-shaped support surface can be used to provide radial support for the connecting shaft 3, thereby further improving the stability of the connecting shaft 3 during rotation.

[0048] In some embodiments, the limiting block 2 can be a crescent-shaped semi-circular structure. In this case, there can be two limiting blocks 2, which are assembled into a complete ring structure and can be detachably installed on the end face of the opening of the connecting cylinder 1. This arrangement makes it easier to install and remove the connecting shaft 3. The limiting block 2 can also be other shapes, as long as it can form a limiting shape with the connecting section 32 in the axial direction to prevent the connecting section 32 from detaching from the connecting cylinder 1.

[0049] In some embodiments, the external splines on the connecting section 32 and the test section 33 have the same dimensions. It should be understood that the axial lengths of the external splines on the connecting section 32 and the test section 33 are the same, and the specifications and dimensions of the external splines are also the same. It should be noted that the dimensions and specifications of the internal splines of the spline sleeve 4 and the internal splines of the connecting cylinder 1 are also the same at this time.

[0050] Furthermore, based on the aforementioned connecting section 32 and test section 33, the two ends of the connecting shaft 3 can be interchanged at will. That is to say, the connecting section 32 can be connected to the motor under test 6 or the dynamometer 5, and the test section 33 can also be connected to the motor under test 6 or the dynamometer 5.

[0051] In some embodiments, the connecting cylinder 1 is provided with a connecting flange 11 coaxially arranged therewith, and the connecting flange 11 has a plurality of bolt holes 111 evenly arranged along the circumference for connecting the dynamometer 5.

[0052] Furthermore, based on the aforementioned connecting flange 11 and bolt holes 111, the connection reliability between the connecting cylinder 1 and the dynamometer 5 can be improved. Furthermore, the diameter of the connecting flange 11 is larger than the diameter of the connecting cylinder 1, and the bolt holes 111 are located at the outer edge of the connecting flange 11, that is, at a position far away from the axis of the connecting flange 11. This arrangement can significantly increase the torque that the connecting cylinder 1 and the connecting flange 11 can withstand.

[0053] In further examples, the connecting sleeve 1 can be bolted to the connecting flange 11, or it can be integrally formed.

[0054] In some embodiments, the spline sleeve 4 includes a spline segment 41 sleeved on the outside of the test segment 33 and a limiting plate 42 disposed opposite to the end of the test segment 33.

[0055] Furthermore, based on the aforementioned limiting plate 42, the spline sleeve 4 and the test section 33 can form an axial limit, and after the spline sleeve 4 is inserted into the motor under test 6, the end of the test section 33 and the motor under test 6 are pressed in the middle to achieve axial limit on both sides, thereby stably fixing it between the motor under test 6 and the test section 33.

[0056] In some further embodiments, the limiting plate 42 is detachably connected to the end of the test segment 33 via a first connecting structure. The first connecting structure may include a first connecting part disposed at the end of the test segment 33 and a second connecting part disposed on the limiting plate 42. Both the first connecting part and the second connecting part may be magnets, thereby realizing the detachable connection between the spline sleeve 4 and the test segment 33. The first connecting part and the second connecting part may also be other structures that can achieve axial fixation and are easy to disassemble and assemble, such as a quick-release plug structure.

[0057] Furthermore, based on the above-mentioned first connection structure, the connection stability between the spline sleeve 4 and the test section 33 can be further improved.

[0058] In some embodiments, a third chamfer structure 35 is provided on the outer periphery of the end of the test segment 33, and a fourth chamfer structure 43 is provided at the connection between the limiting plate 42 and the spline segment 41, which is fitted with the third chamfer structure 35.

[0059] Furthermore, based on the aforementioned third chamfer structure 35, not only can the test segment 33 be easily inserted into the spline segment 41 to achieve a guiding effect, but the fit between the third chamfer structure 35 and the fourth chamfer structure 43 can also increase the contact area between the spline sleeve 4 and the test segment 33, and achieve a bidirectional support effect in both the axial and radial directions, further improving the stability and reliability of the spline sleeve 4 when it rotates with the test segment 33.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A connection structure for a motor testing device, characterized in that, include: Connecting cylinder (1), limiting block (2), connecting shaft (3) and spline sleeve (4); The connecting cylinder (1) is used to connect the dynamometer (5). The connecting shaft (3) includes an intermediate section (31) and connecting sections (32) and test sections (33) located at both ends of the intermediate section (31). The connecting cylinder (1) is sleeved on the outside of the connecting section (32) and connected to the external spline on the connecting section (32) by an internal spline. The connecting section (32) and the connecting cylinder (1) slide in cooperation along the axial direction of the connecting shaft (3). The end of the connecting section (32) is spaced at a set distance from the inner end face of the connecting cylinder (1) and its opposite end face. The set distance is greater than the length of the test section (33). The limiting block (2) is installed on the connecting cylinder (1) and is in a limiting cooperation with the connecting section (32). The spline sleeve (4) is detachably installed on the test section (33) and connected to the external spline on the test section (33) via an internal spline. The external spline of the spline sleeve (4) is used to connect to the motor under test (6).

2. The connection structure of the motor testing device according to claim 1, characterized in that, The motor testing device connection structure also includes an elastic element (7), the two ends of which are connected to the end of the connecting section (32) and the inner end face of the connecting cylinder (1), respectively. The length of the elastic element (7) in the axial direction of the connecting shaft (3) is greater than or equal to the set distance.

3. The connection structure of the motor testing device according to claim 2, characterized in that, The elastic element (7) is a cylindrical spring, and the length of the elastic element (7) is greater than the set distance.

4. The connection structure of the motor testing device according to claim 1, characterized in that, The connection between the intermediate section (31) and the connecting section (32) is provided with a first chamfer structure (34), and the limiting block (2) is provided with a second chamfer structure (21) that slides with the first chamfer structure (34).

5. The connection structure of the motor testing device according to claim 1, characterized in that, The inner peripheral side of the limiting block (2) is an arc-shaped support surface, and the arc-shaped support surface slides in cooperation with at least part of the outer peripheral side of the middle section (31).

6. The connection structure of the motor testing device according to claim 1, characterized in that, The external spline dimensions on the connecting segment (32) and the test segment (33) are the same.

7. The connection structure of the motor testing device according to claim 1, characterized in that, The connecting cylinder (1) is provided with a connecting flange (11) coaxially arranged therewith, and the connecting flange (11) has a plurality of bolt holes (111) evenly arranged along the circumference for connecting the dynamometer (5).

8. The connection structure of the motor testing device according to any one of claims 1 to 7, characterized in that, The spline sleeve (4) includes a spline segment (41) sleeved on the outside of the test segment (33) and a limiting plate (42) disposed opposite to the end of the test segment (33).

9. The connection structure of the motor testing device according to claim 8, characterized in that, The limiting plate (42) is detachably connected to the end of the test section (33) via a first connecting structure.

10. The connection structure of the motor testing device according to claim 8, characterized in that, The outer periphery of the end of the test section (33) is provided with a third chamfer structure (35), and the connection between the limiting plate (42) and the spline section (41) is provided with a fourth chamfer structure (43) that fits into the third chamfer structure (35).

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