Miniature motor micro torque testing device
By using friction bearings and flexible components in the motor micro-torque testing device, high-precision and rapid motor micro-torque testing is achieved, solving the problems of high testing cost and low accuracy in existing technologies, and making it suitable for batch testing on production lines.
Patent Information
- Application Number
- CN202520331850.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-27
AI Technical Summary
Existing motor micro-torque testing devices suffer from high testing costs, low accuracy of test results, and are not suitable for batch testing on production lines. In particular, during micro-torque testing, minute changes in the torque of the load motor can affect the test results.
A friction bearing is used to apply a stable frictional torque to the rotating shaft. The rotating shaft and the motor shaft are connected by a flexible component. The load is transferred using a purely mechanical structure. Combined with clamping fixtures and guide rail structure, the stability and accuracy of the test are ensured.
It features a simple structure, high testing accuracy, and short testing time, making it suitable for mass production line testing of low torque motors. It avoids torque instability caused by overheating of the load motor, thus improving the stability and accuracy of the test.
Smart Images
Figure CN223597056U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to test technical field especially relates to a small -size motor micro torque testing arrangement. BACKGROUND
[0002] Motor assembly is usually needed after torque test, detects whether the motor is qualified, the torque test is the detection motor's current and rotation speed reach standard value after the specified torque load is applied to the motor, micro torque is the torque value that the load size is in For small -size motor, such as vibration motor, robot joint motor, model airplane motor etc., need to carry out micro torque test.
[0003] Current motor torque test usually adopts standard dynamometer or the test device driven by load motor directly or indirectly to apply load to the motor to be tested, but the purchase and use cost of dynamometer is higher, and the operation is complex. Test time is also longer, and it is not suitable for production line batch test, and the test device driven by load motor directly or indirectly has the phenomenon of unstable instantaneous torque in the test process due to load motor overheating and other reasons, thereby causing low test precision, especially when micro torque test is carried out, the micro change of load motor torque will greatly affect the test result.
[0004] Therefore, how to design a micro torque testing device with simple structure, high test precision, short test time and meeting the production line batch test requirement is a technical problem to be solved at present. UTILITY MODEL CONTENTS
[0005] In order to solve the technical problems of high test cost or low test result accuracy in the motor micro torque test in the prior art, the utility model provides a small -size motor micro torque testing device to solve above -mentioned problem.
[0006] The utility model solves technical scheme that the technical problem adopts: a small -size motor micro torque testing device, including the pivot and two installation board with installation hole, the motor to be tested is fixed in the installation hole of one installation board, the pivot is rotatably connected with another installation board through one or more axial abutment friction bearing, the pivot is connected with the motor shaft of the motor to be tested, and the sum of the friction torque values of all friction bearings is equal to the test torque value of the motor to be tested.
[0007] In the optional implementation of the utility model, the pivot is connected with the motor shaft through the flexible piece.
[0008] In the optional implementation of the utility model, the installation hole is fixed with the clamping tool, the clamping tool includes the connecting portion and the limiting portion of the end abutment, the limiting portion is attached with the end of the installation board, and the connecting portion passes through the installation hole and is in interference fit with the installation hole.
[0009] In the optional embodiment of the utility model, the circumferential surface of the clamping tool has a first opening which penetrates in radial direction.
[0010] In the optional embodiment of the utility model, the mounting plate has a second opening which connects the mounting hole and the outer edge of the mounting plate.
[0011] In the optional embodiment of the utility model, the device further comprises a bottom plate, and the bottom plate is provided with guide rails which are in sliding fit with the two mounting plates.
[0012] In the optional embodiment of the utility model, the friction bearing is a rolling bearing.
[0013] In the optional embodiment of the utility model, the device further comprises a tachometer and an ammeter which is electrically connected with the motor to be tested, and the tachometer is opposite to the motor shaft of the motor to be tested.
[0014] In the optional embodiment of the utility model, the flexible member is a plastic hose.
[0015] In the optional embodiment of the utility model, the guide rails extend to both ends of the bottom plate in length direction, the bottom plate on both sides of the guide rails is provided with mounting grooves, and the bolts are in interference fit in the mounting grooves through the mounting plate.
[0016] The utility model discloses the beneficial effect is:
[0017] (1) the small motor micro torque testing device of the utility model adopts the friction bearing to exert the friction torque on the rotating shaft, and the load is transmitted to the motor shaft, and compared with the prior art, the friction torque value of the friction bearing is stable value under the same rotating speed, and will not change with external factors, thereby realizing long-term stable test.
[0018] (2) the utility model adopts the flexible member to connect the rotating shaft and the motor shaft, thereby avoiding that the two cause the collection accuracy to reduce because of the coaxial degree error. DRAWINGS
[0019] The utility model is further illustrated below in connection with the drawings and examples.
[0020] Figure 1 It is the perspective view of the specific embodiment of the small motor micro torque testing device of the utility model;
[0021] Figure 2 It is the use state schematic diagram of the small motor micro torque testing device of the utility model;
[0022] Figure 3 It is the top view of the small motor micro torque testing device of the utility model;
[0023] Figure 4 is Figure 3 A-A sectional view of the utility model;
[0024] Figure 5 is the utility model clamping frock's perspective view;
[0025] Figure 6 is the utility model connecting diagram of rotating shaft and motor shaft.
[0026] In the figure, 1, rotating shaft, 2, mounting plate, 3, mounting hole, 4, motor to be measured, 401, motor shaft, 5, friction bearing, 6, ammeter, 7, tachometer, 8, clamping frock, 801, connecting portion, 802, limiting portion, 9, first opening, 10, second opening, 11, flexible member, 12, bottom plate, 13, guide rail, 14, mounting groove, 15, bolt, 16, shoulder, 17, lug. DETAILED DESCRIPTION
[0027] The embodiments of the utility model are described in detail below, the example of the embodiment is shown in the attached drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the attached drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.
[0028] Embodiment one
[0029] As Figures 1-4 shown, a small motor micro torque testing device, including rotating shaft 1 and two mounting plates 2 with mounting hole 3, the motor to be measured 4 is fixed in the mounting hole 3 of one mounting plate 2, rotating shaft 1 is rotatably connected with the other mounting plate 2 through one or more axially connected friction bearings 5, rotating shaft 1 is connected with the motor shaft 401 of the motor to be measured 4, and the sum of the friction torque values of all friction bearings 5 is equal to the test torque value of the motor to be measured 4.
[0030] The utility model is used for testing whether the current and rotating speed of the motor to be measured 4 are within the specified range under the specified rotating speed and specified torque size.
[0031] Friction bearing 5 refers to the bearing with friction torque, and the friction torque of the bearing has the characteristics of being relatively stable at the same rotating speed, so when the motor to be measured 4 rotates at the specified rotating speed, the motor shaft 401 drives the rotating shaft 1 to rotate, the friction bearing 5 applies stable friction torque to the rotating shaft 1, and the friction torque is the test load, which is transmitted to the motor shaft 401 through the rotating shaft 1, so that the current and rotating speed of the motor to be measured 4 under the test load can be tested.
[0032] Compared with the prior art that a motor is used to provide load driving, the test load in the utility model is generated by a pure mechanical structure and cannot change with external factors, thereby realizing long-term stable testing and higher testing stability.
[0033] The friction bearing 5 can be a rolling bearing.
[0034] The testing steps of the utility model are as follows:
[0035] S1: on a standard dynamometer system, a standard motor performance curve is tested in advance, the standard motor is rotated at a constant speed during testing, and the relationship between the test torque and the current and rotating speed of the standard motor is recorded.
[0036] S2: the friction torque value of the friction bearing 5 is selected from a bearing product manual in advance, the appropriate type and quantity of the friction bearing 5 (three friction bearings 5 are used in the drawings of the embodiment) are selected according to a certain test torque in step S1, the combined torque of all the friction bearings 5 is equal to the test torque, and all the friction bearings 5 are assembled on the mounting plate 2.
[0037] S3: the standard motor is mounted on the mounting plate 2, the standard motor is started at the same rotating speed in step S1, and whether the data (current, rotating speed) of the standard motor meets the testing requirements is tested, thereby realizing calibration of the small motor micro torque testing device.
[0038] S4: after successful calibration in step S3, motors of the same type can be tested in batches (the motor to be tested 4 is mounted on the mounting plate 2, and whether the rotating speed and current of the motor to be tested 4 are within the specified range is tested), thereby realizing rapid fixed-point testing and verifying load data.
[0039] If different torque values are to be tested, the above steps need to be repeated for correction.
[0040] The data acquisition of the current can be realized by using an ammeter 6 electrically connected to the motor to be tested 4, and the data acquisition of the rotating speed can be realized by using a tachometer 7 directly opposite the motor shaft 401 of the motor to be tested 4.
[0041] In further design, the mounting hole 3 is fixed with a clamping tool 8, the clamping tool 8 includes a connecting part 801 and a limiting part 802 which are connected at the end, the limiting part 802 is attached to the end of the mounting plate 2, and the connecting part 801 passes through the mounting hole 3 and is in interference fit with the mounting hole 3. The limiting part 802 of the clamping tool 8 can increase the length of the axial fit surface. For the mounting plate 2 on which the motor to be tested 4 is mounted, the shell of the motor to be tested 4 is tightly fitted in the inner hole of the clamping tool 8, and for the mounting plate 2 on which the rotating shaft 1 is mounted, the friction bearing 5 is mounted in the inner hole of the clamping tool 8, and the limiting part 802 connected with the friction bearing 5 has a large axial length and can meet the arrangement of multiple friction bearings 5.
[0042] Embodiment Two
[0043] On the basis of Embodiment One, the circumferential surface of the clamping tool 8 has a first opening 9 (as shown in FIG. 2) extending radially therethrough. Figure 5
[0044] At this time, the mounting plate 2 can be fixed to the clamping tool 8, and the clamping tool 8 can be fixed to the motor 4 or the friction bearing 5 to be tested in an interference fit manner, without the need for other fixing structures. The first opening 9 can facilitate the quick loading of the motor 4 or the friction bearing 5 to be tested into the clamping tool 8.
[0045] Similarly, the mounting plate 2 has a second opening 10 that communicates between the mounting hole 3 and the outer edge of the mounting plate 2, facilitating the quick assembly of the clamping tool 8 to the mounting plate 2.
[0046] Embodiment Three
[0047] In the above embodiments, when the rotating shaft 1 and the motor shaft 401 are hard connected, i.e., the connecting member therebetween cannot be deformed, if the coaxiality of the rotating shaft 1 and the motor shaft 401 is not high when they are installed, there will be a large torque loss at the connecting position therebetween, thereby reducing the testing accuracy. Therefore, in this embodiment, the rotating shaft 1 and the motor shaft 401 are connected through a flexible member 11. The flexible member 11 is provided with a connecting member that is flexible and can be deformed. Compared with a hard connecting member, the flexible member 11 will not cause jamming, and the torque loss can be greatly reduced, so as to appropriately compensate for the concentricity error between the rotating shaft 1 and the motor shaft 401, thereby improving the concentricity accuracy.
[0048] In the preferred embodiment, the flexible member 11 can be a plastic hose. When there is a concentricity error between the rotating shaft 1 and the motor shaft 401, the flexible member 11 will be bent to a certain extent. The lighter the weight of the flexible member 11, the lower the impact on the measurement accuracy. Figure 6 The two ends of the hose can be directly sleeved on the end portions of the rotating shaft 1 and the motor shaft 401 (as shown in FIG. 2), facilitating disassembly and assembly, thereby improving the convenience and operability when replacing the motor.
[0049] Embodiment Four
[0050] On the basis of the above embodiments, the device further includes a bottom plate 12 having guide rails 13 that slidably cooperate with the two mounting plates 2. The bottom plate 12 provides support for the two mounting plates 2 and can also ensure the coaxiality of the mounting holes 3 of the two mounting plates 2.
[0051] Preferably, the guide rails 13 extend to the two ends of the bottom plate 12 in the length direction, and the bottom plate 12 located on the two sides of the guide rails 13 is provided with mounting grooves 14, and the mounting plate 2 is interference-fitted with the mounting grooves 14 through bolts 15. Figure 1 As shown, the two sides of the mounting plate 2 have protruding shoulders 16, the bottom of the mounting plate 2 has a protruding block 17 inserted into the guide rail 13, the protruding block 17 of the mounting plate 2 is inserted into the guide rail 13 from one end and slides the mounting plate 2 along the guide rail 13 to the appropriate position, the shoulder 16 has a threaded hole, the bolt 15 is inserted into the mounting groove 14 after passing through the threaded hole on the shoulder 16, and is clamped with the side surface of the mounting groove 14.
[0052] In the description of the present application, it should be understood that the terms "first", "second" and the like are used only for the purpose of description, and should not be understood as indicating or implying relative importance.
[0053] In the present specification, the illustrative expressions of the terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner.
[0054] Based on the above ideal embodiments according to the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined according to the scope of the claims.
Claims
1. A small motor micro-torque testing device, characterized in that: The device comprises a rotating shaft (1) and two mounting plates (2) with mounting holes (3), a motor (4) to be tested is fixed to the mounting hole (3) of one of the mounting plates (2), the rotating shaft (1) is rotatably connected to the other mounting plate (2) through one or more axial abutting friction bearings (5), the rotating shaft (1) is connected to the motor shaft (401) of the motor (4) to be tested, and the sum of the friction torque values of all the friction bearings (5) is equal to the test torque value of the motor (4) to be tested.
2. The small motor micro torque testing device according to claim 1, wherein: The rotating shaft (1) is connected to the motor shaft (401) through a flexible member (11).
3. The small motor micro torque testing device according to claim 2, wherein: The mounting hole (3) is fixed with a clamping tool (8), the clamping tool (8) comprises a connecting part (801) and a limiting part (802) which are connected at the end, the limiting part (802) is attached to the end of the mounting plate (2), and the connecting part (801) passes through the mounting hole (3) and is in interference fit with the mounting hole (3).
4. The small motor micro torque testing device according to claim 3, characterized in that: The circumferential surface of the clamping tool (8) has a first opening (9) extending through the radial direction.
5. The small motor micro-torque testing device of claim 2, wherein: The mounting plate (2) has a second opening (10) which is in communication with the mounting hole (3) and the outer edge of the mounting plate (2).
6. The small motor micro torque testing device of claim 1, wherein: The device further comprises a bottom plate (12) which has guide rails (13) slidingly fitted with the two mounting plates (2).
7. The small motor micro torque testing device of claim 2, wherein: The friction bearing (5) is a rolling bearing.
8. The small motor micro torque testing device of claim 1, wherein: The device further comprises a tachometer (7) and an ammeter (6) electrically connected to the motor (4) to be tested, and the tachometer (7) is directly opposite the motor shaft (401) of the motor (4) to be tested.
9. The small motor micro torque testing device of claim 2, wherein: The flexible member (11) is a plastic hose.
10. The small motor micro torque testing device of claim 6, wherein: The guide rails (13) extend to the both ends of the bottom plate (12) along the length direction, the bottom plate (12) on both sides of the guide rails (13) is provided with mounting grooves (14), and bolts (15) are in interference fit with the mounting grooves (14) through the mounting plates (2).