Motor inertia testing device

Abstract

The utility model relates to a motor inertia testing device, which comprises a base, a frame body arranged on the base and a rotating shaft arranged on the frame body and used for installing a rotating assembly, and is characterized in that the rotating shaft is vertically arranged on the frame body and comprises a first section part used for being connected with a rotor of a motor to be tested; the rotating shaft is vertically arranged on the frame body, the first section part is rotatably connected with the frame body, the second section part is rotatably connected with the frame body, correspondingly, a stator of a to-be-tested motor is fixedly connected to a position, corresponding to the first section part, of the frame body, and the rotating shaft is further provided with a sensor used for improving the testing precision. Therefore, the shaft body is prevented from being deformed due to the gravity of the rotating assembly and generating unbalance of the rotating shaft, the testing precision is ensured, the inertia testing device is particularly suitable for large-load and high-precision inertia testing, and the testing precision and reliability can be greatly improved due to the fact that the inertia testing device is further provided with a sensor such as an angle encoder and a vibration isolation platform.

Description

Technical Field

[0001] The utility model relates to the technical field of motor testing, in particular to a testing device for testing the large inertia inertial load of a motor. Background Art

[0002] A servo system is a feedback control system used to accurately follow or reproduce a certain process, and is widely used in fields such as inertial navigation devices, autonomous driving, and automatic machine tools. In terms of the performance testing of servo systems, it usually includes the inertial testing of servo motors, that is, connecting the servo motor to a rotating shaft, and arranging rotating components such as an inertia disc with a certain load on the rotating shaft, so as to test the inertia and other related performances of the servo motor driving the load.

[0003] Currently, a commonly used motor inertia testing device for servo motors is, for example, a motor inertia testing device disclosed in the Chinese utility model patent "A Servo Motor Inertia Testing Device" with the patent number CN202220158053.6 (publication number CN217181162U). It includes a base, a rotating shaft is horizontally arranged on the side plate of the base, and a detachable and replaceable inertia disc is arranged on the rotating shaft.

[0004] However, such motor inertia testing devices still have the following problems in actual use: First, when the load on the rotating shaft is too large, the horizontally arranged rotating shaft will bend and deform, generating an unbalance amount of the rotating shaft and reducing the testing accuracy. Therefore, it is not suitable for high-precision and large-load inertia testing; Second, vibration may occur at the rotating shaft during the testing process and be transmitted to the base, which will reduce the testing accuracy and reliability. Therefore, it is still necessary to further improve the existing motor inertia testing device. Summary of the Utility Model

[0005] The first technical problem to be solved by the utility model is to provide a motor inertia testing device that can avoid the reduction of testing accuracy due to the deformation of the rotating shaft in view of the above-mentioned current technical situation.

[0006] The second technical problem to be solved by the utility model is to provide a motor inertia testing device that can reduce vibration interference in view of the above-mentioned current technical situation.

[0007] The technical solution adopted by the utility model to solve the first technical problem is: A motor inertia testing device, including a base, a frame is arranged on the base, and a rotating shaft for installing a rotating component is arranged on the frame, and it is characterized in that:

[0008] The rotating shaft is vertically arranged on the frame body, including a first section for connecting with the rotor of the motor to be tested, and a second section rotatably connected to the frame body. Correspondingly, the stator of the motor to be tested is fixedly connected to the position on the frame body corresponding to the first section, and a sensor for improving the test accuracy is also arranged on the rotating shaft.

[0009] To facilitate accommodating the rotating assembly with a large load, preferably, the frame body includes an upper plate body and a lower plate body, and an accommodating space for accommodating the rotating assembly is formed between the upper plate body and the lower plate body. This accommodating space ensures that the large-load rotating assembly with a relatively large size has sufficient space to rotate, avoiding the rotating assembly colliding with other components or objects in the rotating space and affecting the test accuracy.

[0010] To make the rotating assembly rotate smoothly, preferably, the rotating assembly is an "O"-shaped object or a cylindrical hollow object with an integrated structure. Designing the rotating assembly as an integrated structure is to avoid the possible imbalance when it rotates with the rotating shaft. In addition, according to the test requirements, rotating assemblies with different weights can be replaced to adjust the moment of inertia during the test.

[0011] To improve the test accuracy of the motor inertia test device, preferably, an installation part for installing the stator is provided on the lower plate body, a through hole is provided on the upper plate body for the second section to pass through, and the sensor is also connected to the upper end of the second section. Such a design is considered because usually a servo motor has a certain weight. If it is arranged on the upper plate body, stronger vibration will be generated during the test. Therefore, the motor to be tested is arranged on the lower plate body to improve the test accuracy. On the other hand, the sensor is also connected to the upper end of the second section. Specifically, the sensor can be a high-precision sensor such as an angle encoder or a resolver, so as to determine the position and motion information of the rotating assembly to improve the test accuracy.

[0012] To make the sensor have a high accuracy, preferably, the sensor is an angle encoder, including a circular grating installed on the second section and a reading head fixed on the upper plate body. Selecting an angle encoder has extremely high test accuracy compared with other sensors such as resolvers.

[0013] To facilitate the installation of the rotating shaft, preferably, a first installation space for installing the first section is reserved between the lower plate body and the rotating assembly. Correspondingly, a second installation space for installing the second section is reserved between the upper plate body and the rotating assembly. The first installation space and the second installation space not only facilitate the installation of the first section and the second section, but also ensure sufficient distance between the rotating assembly and the upper plate body and the lower plate body to avoid scratching.

[0014] To enable the first section and the second section to be fixedly connected to the rotating assembly, preferably, the upper end of the first section bulges radially outward to form a first flange, and a first mating portion for fixedly connecting to the first flange is provided on the lower surface of the rotating assembly. Similarly, the lower end of the second section has a second flange, and a second mating portion for fixedly connecting to the second flange is provided on the upper surface of the rotating assembly. The first mating portion and the second mating portion can adopt structures such as through holes, etc., so as to be fixedly connected to the first flange and the second flange through bolts.

[0015] To be able to adapt to motors to be tested with different specifications, preferably, a third installation space for installing the stator is reserved below the lower plate body. The reason for setting this third installation space is mainly to consider that motors to be tested with different specifications may have different lengths, so additional space needs to be reserved to adapt to various motors to be tested with different lengths.

[0016] To solve the second technical problem, the present utility model provides a motor inertia testing device. Preferably, an anti-vibration platform for reducing vibration interference is further provided between the frame body and the base. According to actual needs, the anti-vibration platform can be selected from various structures such as rubber structures, metal springs, air springs, etc.

[0017] Furthermore, to enable the anti-vibration platform to have a better anti-vibration effect, preferably, the anti-vibration platform is a thin-film type air spring support structure. The thin-film type air spring support structure has a better anti-vibration effect compared to other types of anti-vibration platforms, and can greatly reduce the interference caused by vibration to the test.

[0018] Compared with the prior art, the advantages of the present utility model are as follows: By vertically arranging the rotating shaft on the frame body, the shaft body is prevented from deforming due to the gravity of the rotating assembly and generating an unbalance of the rotating shaft, ensuring the test accuracy. Therefore, it is particularly suitable for large-load and high-precision inertia tests. Sensors such as angle encoders and components such as anti-vibration platforms are also provided, which can greatly improve the accuracy and reliability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural view of the motor inertia testing device in Embodiment 1 of the present utility model;

[0020] Figure 2 is an exploded structural view of the motor inertia testing device in Embodiment 1 of the present utility model;

[0021] Figure 3 is a schematic structural view of the rotating assembly, the rotating shaft, the motor to be tested, and the sensor in Embodiment 1 of the present utility model;

[0022] Figure 4Schematic diagram of the lower plate body in Embodiment 1 of the present utility model;

[0023] Figure 5 Schematic diagram of the rotating assembly, lower plate body, motor to be tested, and vibration isolation platform in Embodiment 1 of the present utility model;

[0024] Figure 6 Schematic diagram of the motor to be tested in Embodiment 1 of the present utility model;

[0025] Figure 7 Schematic diagram of the sensor in Embodiment 1 of the present utility model;

[0026] Figure 8 Schematic diagram of the rotating assembly in Embodiment 1 of the present utility model;

[0027] Figure 9 Schematic diagram of the motor inertia testing device in Embodiment 2 of the present utility model;

[0028] Figure 10 Schematic diagram of the rotating assembly and the rotating shaft in Embodiment 2 of the present utility model. Detailed implementation manners

[0029] The present utility model will be further described in detail below in conjunction with specific embodiments.

[0030] Embodiment 1

[0031] As Figures 1 to 8 shown, it is a preferred embodiment of the present utility model. The motor inertia testing device in this embodiment includes a base 1, a frame 2 is arranged on the base 1, and a rotating shaft 4 for installing a rotating assembly 3 is arranged on the frame 2. And the rotating shaft 4 is vertically arranged on the frame 2, including a first section 41 for connecting with the rotor 51 of the motor 5 to be tested and a second section 42 rotatably connected with the frame 2. Correspondingly, the stator 52 of the motor 5 to be tested is fixedly connected to the position on the frame 2 corresponding to the first section 41. A sensor 6 for improving the testing accuracy is also arranged on the rotating shaft 4. In terms of the structure of the frame 2, the frame 2 includes an upper plate body 21 and a lower plate body 22, and a accommodating space 23 for accommodating the rotating assembly 3 is formed between the upper plate body 21 and the lower plate body 22. This accommodating space 23 ensures that the large-load rotating assembly 3 with a large size has enough space to rotate, avoiding the rotating assembly 3 colliding with other components or objects in the rotating space and affecting the testing accuracy.

[0032] Regarding the testing accuracy, in order to make the rotating assembly 3 rotate smoothly, refer to Figure 8, the rotating component 3 is an integrated "mouth" - shaped object. Designing the rotating component 3 as an integrated structure can avoid the possible imbalance when it rotates with the rotating shaft 4. In addition, according to the test requirements, different - weight rotating components 3 can be replaced to adjust the moment of inertia during the test. In order to further improve the test accuracy of the motor inertia test device, as Figures 2 to 4 shown, in this embodiment, an installation part 221 for installing the stator 52 is provided on the lower plate body 22, and a through - hole 211 is provided on the upper plate body 21 for the second - stage part 42 to pass through. A sensor 6 is also connected to the upper end of the second - stage part 42. Such a design is considered because a servo motor usually has a certain weight. If it is set on the upper plate body 21, stronger vibrations will be generated during the test. Therefore, the motor 5 to be tested is set on the lower plate body 22 to improve the test accuracy. On the other hand, a sensor 6 is connected to the upper end of the second - stage part 42. Specifically, the sensor 6 can be a high - precision sensor such as an angle encoder or a resolver, so as to determine the position and motion information of the rotating component 3 to improve the test accuracy. In order to make the sensor 6 have a high precision, the sensor 6 in this embodiment is an angle encoder, which includes a circular grating 61 installed on the second - stage part 42 and a reading head 62 fixed on the upper plate body 21. Selecting an angle encoder has extremely high test accuracy compared to other sensors 6 such as resolvers.

[0033] Regarding the installation of each component, a first installation space 31 for installing the first - stage part 41 is reserved between the lower plate body 22 and the rotating component 3. Correspondingly, a second installation space 32 for installing the second - stage part 42 is reserved between the upper plate body 21 and the rotating component 3. A third installation space 222 for installing the stator 52 is also reserved below the lower plate body 22. The first installation space 31 and the second installation space 32 not only facilitate the installation of the first - stage part 41 and the second - stage part 42, but also ensure sufficient distance between the rotating component 3 and the upper plate body 21 and the lower plate body 22 to avoid scraping. Setting the third installation space 222 mainly considers that motors 5 to be tested with different specifications may have different lengths, so extra space needs to be reserved to adapt to various motors 5 with different lengths. In order to enable the first - stage part 41 and the second - stage part 42 to be fixedly connected to the rotating component 3, in this embodiment, the upper end of the first - stage part 41 protrudes radially outward to form a first flange 411, and a first mating part 33 for fixedly connecting with the first flange 411 is provided on the lower surface of the rotating component 3. Similarly, the lower end of the second - stage part 42 has a second flange 421, and a second mating part 34 for fixedly connecting with the second flange 421 is provided on the upper surface of the rotating component 3. See Figures 2 to 3, taking the second flange 421 as an example, through holes are circumferentially formed in the second flange 421. Correspondingly, the second mating part 34 is a corresponding through hole circumferentially formed on the upper surface of the rotating assembly 3. Thus, the second flange 421 and the second mating part 34 are fixedly connected by bolts. With such a design, relative rotation between the rotating assembly 3 and the rotating shaft 4 can be avoided during rotation.

[0034] To facilitate the installation of the stator 52 on the lower plate body 22, a preset distance H is maintained between the lower plate body 22 and the lower plane for installing the stator 52. The setting of this preset distance H is mainly considered that the motors 5 to be tested with different specifications may have different lengths. Therefore, extra space needs to be reserved to adapt to various motors 5 to be tested with different lengths.

[0035] Since vibration will be generated during the test, which affects the test accuracy, an anti-vibration platform 7 for reducing vibration interference is further provided between the frame 2 and the base 1 in this embodiment. According to actual needs, the anti-vibration platform 7 can be selected from various structures such as rubber structures, metal springs, air springs, etc. The anti-vibration platform 7 in this embodiment is a thin-film air spring support structure. The thin-film air spring support structure has a better anti-vibration effect compared to other types of anti-vibration platforms 7, and can greatly reduce the interference caused by vibration to the test. And because the anti-vibration platform 7 is provided in this embodiment, the preset distance H is the distance between the lower plate body 22 and the anti-vibration platform 7.

[0036] Embodiment 2

[0037] As Figure 9 、 Figure 10 shown, it is basically the same as Embodiment 1, the difference being that the rotating assembly 3 in this embodiment is a cylindrical hollow object, and the rotating shaft 4 passes through the rotating assembly 3. Compared with Embodiment 1, this solution is relatively simpler in installation, but the rotating assembly 3 is not integrally provided, so the accuracy may be slightly lower than that of the solution in Embodiment 1.

Claims

1. A motor inertia testing device, comprising a base (1), a frame body (2) is arranged on the base (1), and a rotating shaft (4) for installing a rotating component (3) is arranged on the frame body (2), and is characterized in that: The rotating shaft (4) is vertically arranged on the frame body (2), and includes a first section (41) for connecting with the rotor (51) of the motor (5) to be tested, and a second section (42) rotatably connected with the frame body (2). Correspondingly, the stator (52) of the motor (5) to be tested is fixedly connected to the position on the frame body (2) corresponding to the first section (41), and a sensor (6) for improving the testing accuracy is further arranged on the rotating shaft (4).

2. The motor inertia testing device according to claim 1, characterized in that: The frame body (2) includes an upper plate body (21) and a lower plate body (22), and an accommodation space (23) for accommodating the rotating component (3) is formed between the upper plate body (21) and the lower plate body (22).

3. The motor inertia testing device according to claim 2, wherein: The rotating component (3) is an integrated "mouth"-shaped object or a cylindrical hollow object.

4. The motor inertia testing device according to claim 2, wherein: An installation part (221) for installing the stator (52) is formed on the lower plate body (22), a through hole (211) is formed on the upper plate body (21) for the second section (42) to pass through, and the sensor (6) is further connected to the upper end of the second section (42).

5. The motor inertia testing device according to claim 4, characterized in that: The sensor (6) is an angle encoder, and includes a circular grating (61) installed on the second section (42), and a reading head (62) fixed on the upper plate body (21).

6. The motor inertia testing device according to claim 4, wherein: A first installation space (31) for installing the first section (41) is reserved between the lower plate body (22) and the rotating component (3). Correspondingly, a second installation space (32) for installing the second section (42) is reserved between the upper plate body (21) and the rotating component (3).

7. The motor inertia testing device according to claim 6, wherein: A first flange (411) is formed by radially protruding outward at the upper end of the first section (41), and a first mating part (33) for fixedly connecting with the first flange (411) is formed on the lower surface of the rotating component (3). Similarly, a second flange (421) is provided at the lower end of the second section (42), and a second mating part (34) for fixedly connecting with the second flange (421) is formed on the upper surface of the rotating component (3).

8. The motor inertia testing device according to claim 4, wherein: A third installation space (222) for installing the stator (52) is further reserved below the lower plate body (22).

9. The motor inertia testing device according to any one of claims 1 to 8, characterized in that: An anti-vibration platform (7) for reducing vibration interference is further arranged between the frame body (2) and the base (1).

10. The motor inertia testing device according to claim 9, characterized in that: The anti-vibration platform (7) is a thin-film type air spring support structure.

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