Variable inertia test platform for servo motor

Abstract

The utility model discloses a servo motor variable inertia test platform, which comprises a platform substrate, a test shaft, a support vertical plate, a disc placing sleeve, an inertia flywheel and a full-speed encoder, the test shaft is supported by the support vertical plate, one end tail of the test shaft is connected with a servo motor to be tested, the other end tail of the test shaft is connected with the full-speed encoder, and the test shaft comprises a small-diameter shaft section, a large-diameter shaft section and a connecting disc. The small-diameter shaft section can be sleeved with the disc containing sleeve in a relatively rotating mode, the connecting disc is located on the large-diameter shaft section, and a loaded inertia flywheel slides to the large-diameter shaft section from the disc containing sleeve and is connected to the connecting disc in series; according to the test platform, the inertia flywheel capable of being loaded in a sliding mode is preset through the disc placing sleeve, loading configuration can be rapidly carried out according to different inertia load matching values, the test efficiency is improved, the operation difficulty is reduced, and the inertia test precision of the servo motor after loading adjustment is guaranteed; and the full-speed encoder is matched with the encoder of the servo motor, so that the closed-loop performance test of the output performance of the servo motor is realized, and the control precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor testing, in particular to a servo motor variable inertia testing platform. Background Technique

[0002] The servo motor is an important component in mechanical transmission. The matching relationship between the moment of inertia of the load and the moment of inertia of the servo motor is crucial for the response and stability of the servo system, and is an important prerequisite for giving full play to the best performance of the entire mechanical and servo system. Therefore, it is necessary to test each model of servo motor before use;

[0003] During the test, the load inertia is generally loaded by an inertia disc. During the test process, performance tests of multiple load inertia and servo motor inertia ratios are required. Therefore, it is necessary to change the number or size of the inertia discs at the load end according to needs. The existing test platforms have the following several defects: 1. It is not easy to change the load size, that is, it is not easy to disassemble and assemble the inertia discs, and the test efficiency is low; 2. The existing test platforms are all open-loop tests. Under the influence of transmission clearance, transmission stiffness, load eccentricity, disturbance resistance torque, etc., there is a certain error between the actual output of the servo motor in the load inertia test and the output recorded by the encoder. Therefore, the control accuracy of the servo motor under the load inertia also needs to be collected to perform early correction and adjustment on the encoder output of the servo system to improve the control accuracy; 3. The general design of the existing test platforms for servo motors with different powers needs to be improved. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a servo motor variable inertia testing platform to solve one or more of the problems mentioned in the above background technique.

[0005] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A variable inertia test platform for a servo motor, comprising a platform base plate, a test shaft, a support vertical plate, a disk sleeve, a number of inertia flywheels, and a full-speed encoder. The support vertical plate is fixed on the platform base plate. The test shaft is supported at both ends by the support vertical plate, and one end thereof is connected to the servo motor to be tested through a motor coupling, and the other end is connected to the full-speed encoder through a coupling, which is used to collect the output end position signal to test the closed-loop performance of the servo motor. The full-speed encoder is supported by the support vertical plate. The test shaft includes a small-diameter shaft section, a large-diameter shaft section, and a connecting disk. The disk sleeve is rotatably sleeved outside the small-diameter shaft section. The flange end of the disk sleeve is connected to the support vertical plate, and its sleeve section extends axially along the test axis towards the large-diameter shaft section, which is used to pass through the idle inertia flywheels. The connecting disk is located on the large-diameter shaft section. The outer diameter of the sleeve section of the disk sleeve and the shaft diameter of the large-diameter shaft section are respectively smaller than or adapted to the central hole of the inertia flywheel. A number of connecting holes are annularly distributed on the disk surface of the inertia flywheel. The loaded inertia flywheel slides from the disk sleeve to the large-diameter shaft section and is connected to the connecting disk through a connecting component by connecting the connecting holes in series.

[0007] Further, the motor coupling is detachably connected to the test shaft and the servo motor respectively. A number of positioning posts are provided on the platform base plate, and a number of spare couplings are placed through the positioning posts for replacement according to servo motors with different powers.

[0008] Furthermore, it further includes a through-load mechanism and a reduction encoder. The reduction encoder is supported by the support vertical plate. One end of the through-load mechanism is connected to the test shaft for inputting the high-speed movement of the servo motor, and the other end of the through-load mechanism is connected to the reduction encoder for collecting the position signal of the output end of the test shaft after deceleration to test the closed-loop performance of the servo motor after passing through the through-load mechanism.

[0009] Further, the through-load mechanism includes a high-speed pulley, a belt, and a low-speed pulley. The high-speed pulley is fixed on the other end of the test shaft. The high-speed pulley and the connecting disk are respectively located on both sides of the support vertical plate. The axle of the low-speed pulley is connected to the reduction encoder through a coupling.

[0010] Further, the disk sleeve is preset with a number of inertia flywheels of at least two weight specifications respectively and is classified and centrally arranged. The inertia flywheel with the smallest weight specification is located on the side close to the large-diameter shaft section, and the inertia flywheel with the largest weight specification is located on the side close to the disk sleeve.

[0011] Compared with the prior art, a variable inertia test platform for a servo motor of the present utility model has the following beneficial effects:

[0012] 1. The variable inertia test platform presets multiple slidable inertia flywheels through the disc sleeve. Therefore, the loading configuration of the inertia flywheel can be quickly performed according to the different inertia load ratio values ​​of the servo motor. The load amount can be adjusted without a large amount of axial disassembly and installation, which improves the test efficiency and reduces the difficulty of operation. Since the disassembly of the connecting joint is not required, the accuracy of the servo motor inertia test after the loading adjustment can be guaranteed;

[0013] 2. An additional full-speed encoder is set at the output end of the test shaft to cooperate with the encoder built into the servo motor to realize closed-loop performance testing of the servo motor output performance and further improve the control accuracy of the servo system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the test platform of the utility model;

[0015] Figure 2 A top view of the test platform of the utility model;

[0016] Figure 3 It is a cross-sectional view of the test platform of the utility model.

[0017] In the figure: 1. platform base plate; 2. servo motor; 3. motor mounting plate; 4. motor coupling; 5. disc sleeve; 6. support plate; 7. test shaft; 71. small diameter shaft section; 72. large diameter shaft section; 73. connecting plate; 8. spare coupling; 9. inertia flywheel; 10. load-carrying mechanism; 101. high-speed pulley; 102. low-speed pulley; 11. full-speed encoder; 12. reduction encoder. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only the best embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] This embodiment provides a servo motor variable inertia test platform, such as Figures 1 - 3As shown, the platform substrate 1 is used as a test platform, and movable handles are arranged at both ends of the table. The servo motor 2 to be tested is supported and mounted on the platform substrate 1 through the motor mounting plate 3. The test shaft 7 is detachably connected to the servo motor 2 through the motor coupling 4. The test shaft 7 is supported at both ends by two support vertical plates 6 on the platform substrate 1 that are parallel to the motor mounting plate 3. One end of the test shaft 7 passes through the support holes of the disc sleeve 5 and the support vertical plate 6, and extends out of the support hole to be detachably connected to the motor coupling 4. The other end of the test shaft 7 passes through the support hole of the other support vertical plate 6, and is sequentially connected to the through-load mechanism 10 and the full-speed encoder 11. A bearing is arranged in the support hole for rotatably supporting the test shaft 7.

[0020] like Figure 3 As shown, the test shaft 7 includes a small diameter shaft section 71, a large diameter shaft section 72 and a connecting plate 73 of an integrated structure. The connecting plate 73 is evenly distributed with a number of threaded holes in an annular shape. The small diameter shaft section 71 is connected to the large diameter shaft section 72, wherein the small diameter shaft section 71 is used to insert the disc sleeve 5 and is rotatably connected to the middle hole of the disc sleeve 5. The flange end of the disc sleeve 5 is connected to the supporting vertical plate 6 at one end of the test shaft 7. The disc sleeve 5 has a sleeve section, which extends a certain length along the axial direction of the test shaft 7. Before the test is carried out, the inertia flywheel 9 is placed on the disc sleeve 5 through the sleeve, and the large diameter shaft section 72 is used to sleeve the loaded inertia flywheel. 9, the inertia flywheel 9 is evenly distributed with connection holes in an annular shape, and the inertia flywheel 9 for loading is connected in series through the connection holes provided by the connection assembly, and is fixed by threading the connection disk 73, and the outer diameter of the sleeve end of the disk sleeve 5 and the shaft diameter of the large diameter shaft section 72 are respectively smaller than or adapted to the center hole of the inertia flywheel, so that the inertia flywheel can be slidably transported or adjusted between the two. During the test, the ratio value of the inertia load is preset according to the inertia of the motor, and the number of the inertia flywheels 9 adapted is selected according to the ratio value. The inertia flywheel 9 can be divided into at least two weight specifications according to the weight to adapt to loads of different orders of magnitude, Figure 1 The inertia flywheel 9 shown in the figure has two specifications. The inertia flywheel 9 of small weight specification is arranged on the side close to the large diameter shaft section 72. During the test, the inertia flywheel 9 slides from the disc sleeve 5 to the large diameter shaft section 72 for loading;

[0021] The input shaft of the full-speed encoder 11 is connected to the other end of the test shaft 7 through a coupling, and the full-speed encoder 11 is supported on the supporting plate 6 to ensure that the central axes of the servo motor 2 shaft, the test shaft 7 and the input shaft of the full-speed encoder 11 are respectively collinear. The full-speed encoder 11 collects the position signal of the output end of the test shaft 7, and combines the encoder on the servo motor 2 to collect the output position signal of the motor itself, thereby realizing the test of the motor's full closed-loop performance, guiding the signal correction of the encoder on the servo motor 2, and improving the control accuracy of the servo motor 2.

[0022] In the actual operation of the servo motor 2, it is usually necessary to reduce the speed and increase the torque for power output. In order to further improve the control accuracy of the output end, at the same time, the position signal of the output end after deceleration is also collected to achieve a higher-precision closed-loop performance test. The commonly used speed reduction and load-carrying mechanism 10 of this type of servo motor 2 is used for speed reduction, as Figures 1 - 2 shown. The load-carrying mechanism 10 is realized by a belt speed reduction mechanism, which includes a high-speed pulley 101, a belt, and a low-speed pulley 102. The reduction encoder 12 is arranged in parallel with the full-speed encoder 11 on one side of the support vertical plate 6. The axle of the low-speed pulley 102 is connected to the reduction encoder 12 through a coupling. The reduction encoder 12 and the low-speed pulley 102 are respectively located on both sides of the support vertical plate 6. The high-speed pulley 101 and the inertia flywheel 9 are also located on both sides of the adjacent support vertical plate 6. The high-speed pulley 101 is fixedly connected to the test shaft 7 and is connected to the low-speed pulley 102 through belt drive to perform a closed-loop performance test in the way of simulating the actual power output;

[0023] In addition, since the shaft diameters of servo motors 2 with different powers are different, in order to facilitate quick universal connection, the servo motor 2 is detachably connected to the test shaft 7 through a motor coupling 4. At the same time, several positioning columns are arranged on the idle table surface outside the test area of the platform substrate 1, and a spare coupling 8 of the servo motor 2 with a frequently measured power is inserted on the positioning columns for easy replacement.

[0024] The descriptions of the orientation terms such as "upper", "lower", "end", and "side" mentioned in this article are based on Figures 1 - 3 the directions and orientations shown in the corresponding drawings in

[0025] this. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated devices, elements, or components must have a specific orientation, or be constructed and operated in a specific orientation;

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A servo motor variable inertia test platform, characterized in that: It includes a platform substrate, a test shaft, a supporting vertical plate, a disk placing sleeve, several inertia flywheels, and a full-speed encoder. The supporting vertical plate is fixed on the platform substrate. The two ends of the test shaft are supported by the supporting vertical plate, and one end of the test shaft is connected to the servo motor to be tested through a motor coupling, and the other end is connected to the full-speed encoder through a coupling, which is used to collect the position signal of the output end of the test shaft to test the closed-loop performance of the servo motor. The full-speed encoder is supported by the supporting vertical plate. The test shaft includes a small-diameter shaft section, a large-diameter shaft section, and a connecting disk. The disk placing sleeve is rotatably sleeved outside the small-diameter shaft section. The flange end of the disk placing sleeve is connected to the supporting vertical plate, and its sleeve section extends axially along the test shaft towards the large-diameter shaft section, which is used to pass through the idle inertia flywheels. The connecting disk is located on the large-diameter shaft section. The outer diameter of the sleeve section of the disk placing sleeve and the shaft diameter of the large-diameter shaft section are respectively smaller than or adapted to the central hole of the inertia flywheel. Several connecting holes are annularly distributed on the disk surface of the inertia flywheel. The loaded inertia flywheel slides from the disk placing sleeve to the large-diameter shaft section and is connected to the connecting disk through a connecting component in series through the connecting holes.

2. The servo motor variable inertia test platform according to claim 1, characterized in that: The motor coupling is respectively detachably connected to the test shaft and the servo motor. Several positioning columns are arranged on the platform substrate, and several spare couplings are placed through the positioning columns for replacement according to servo motors with different powers.

3. The servo motor variable inertia test platform according to claim 1, characterized in that: It further includes a power transmission mechanism and a reduction encoder. The reduction encoder is supported by the supporting vertical plate. One end of the power transmission mechanism is connected to the test shaft, which is used to input the high-speed movement of the servo motor. The other end of the power transmission mechanism is connected to the reduction encoder, which is used to collect the position signal of the output end of the test shaft after deceleration to test the closed-loop performance of the servo motor after power transmission.

4. The servo motor variable inertia test platform according to claim 3, characterized in that: The power transmission mechanism includes a high-speed pulley, a belt, and a low-speed pulley. The high-speed pulley is fixed on the other end of the test shaft. The high-speed pulley and the connecting disk are respectively located on both sides of the supporting vertical plate. The axle of the low-speed pulley is connected to the reduction encoder through a coupling.

5. The servo motor variable inertia test platform according to claim 1, characterized in that: The disk placing sleeve is preset with several inertia flywheels of at least two weight specifications respectively, and they are classified and centrally arranged. The inertia flywheel with the smallest weight specification is located on the side close to the large-diameter shaft section, and the inertia flywheel with the largest weight specification is located on the side close to the disk placing sleeve.

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