A servo motor durability testing device

Abstract

The present invention discloses a servo motor durability test device, wherein the rotary device comprises a rotary base, a rotary body, a permanent magnetic suspension component, and an electromagnetic drive component; the rotary base is arranged on a supporting base; the rotary body is arranged in the supporting base, has a rotary center axis, and has a rotation state of rotating around the rotary center axis; the permanent magnetic suspension component is arranged between the rotary base and the rotary body, and has a magnetic force that constrains the rotary body to be suspended in the rotary base and forms a rotational degree of freedom; the electromagnetic drive component is arranged between the rotary body and the rotary base, and is used to drive the rotary body to form the rotation state; the two ends of the rotary device on the supporting base are respectively provided with motors to be tested; the central axis of the motor to be tested is connected to the rotary body by transmission. The present invention can synchronously perform durability tests on two motors to be tested, and can quickly switch between two durability test items, is convenient to operate, saves time and effort, and effectively meets the durability test requirements of the servo motor.

Description

Technical Field

[0001] The invention relates to the technical field of testing devices, and in particular to a servo motor durability testing device. Background Art

[0002] As an important part of the equipment, the stability and reliability of the servo motor are very important, so it is very important to perform durability tests on the servo motor. Usually, the durability test items of the servo motor include high-speed forward and reverse durability test and brake durability test in the servo motor.

[0003] During the high-speed forward and reverse endurance test, the central axis of the servo motor rotates forward and reverse without torque, and the test is judged whether it has passed by observing the presence or absence of abnormalities during long-term operation.

[0004] During the durability test of the brake in the servo motor, the central shafts of the two servo motors are connected through a coupling. The brakes in the two servo motors are powered separately and controlled by the programmable controller. The brakes will lock when the power is off and open when the power is on. During the test, the motor at one end loses potential energy and the brake inside it loses power. At this time, the motor spindle is locked in the brake power-off state. At the same time, the brake of the motor at the other end is powered on and the motor runs synchronously. At this time, the brake that loses power is subjected to the torque applied by the other motor. After a period of time, the running motor loses potential energy and the brake inside it loses power. The brake of the other motor is powered on and runs, and this is repeated. If the brake fails, rotation will occur. At this time, the encoder in the servo motor detects the displacement and records the number of displacement circles. The test is qualified by monitoring whether the brake fails and the number of failures for a long time.

[0005] In the above two durability test items, the coupling needs to be disassembled or installed to achieve the test switching of the above two test items, which is cumbersome, time-consuming and labor-intensive. In addition, when testing in simulated environments such as simulated temperature, humidity, and rain, a single electric servo motor is tested for durability without test comparison data from synchronous testing in a conventional environment, which makes it difficult to fully and truly reflect the brake durability performance of the servo motor. Summary of the invention

[0006] In view of the above-mentioned technical problems, the purpose of the present invention is to propose a servo motor durability testing device, which can synchronously perform durability tests on two motors to be tested and can quickly switch between two durability test items. The operation is convenient, time-saving and labor-saving, and the durability testing requirements of the servo motor are effectively met.

[0007] The technical solution of the present invention is achieved as follows: a servo motor durability test device, including a supporting base and a rotating device;

[0008] The rotating device comprises a rotating base, a rotating body, a permanent magnetic suspension component, and an electromagnetic drive component;

[0009] The rotating base is arranged on the supporting base; the rotating body is arranged in the rotating base, has a rotating center axis, and has a rotating state rotating around the rotating center axis;

[0010] The permanent magnetic suspension assembly is arranged between the rotating base and the rotating body, and has a magnetic force that constrains the rotating body to be suspended in the rotating base and forms a rotational degree of freedom;

[0011] The electromagnetic driving assembly is arranged between the rotating body and the rotating base, and is used to drive the rotating body to form the rotating state;

[0012] Motors to be tested are respectively arranged at two ends of the rotating device on the supporting base; and the central axis of the motor to be tested is drivingly connected with the rotating body.

[0013] Furthermore, the supporting base is provided with a receiving chamber and a cover for opening and closing the receiving chamber; one group of the motors to be tested is arranged in the receiving chamber.

[0014] Furthermore, the cover body is provided with a sprinkler device for sprinkling water into the receiving chamber.

[0015] Furthermore, the watering device includes a watering pipe distributed on the back of the cover body, and a water supply pipe inserted into the cover body and connected to the watering pipe; a water-permeable hole is provided on the watering pipe facing the receiving chamber.

[0016] Furthermore, the supporting base is provided with a drainage hole communicated with the receiving chamber and an opening and closing member for opening and closing the drainage hole.

[0017] Furthermore, the cover body is provided with a heating device for heating the air in the receiving chamber.

[0018] Furthermore, the electromagnetic drive component includes a first permanent magnet ring body and an excitation winding; the first permanent magnet ring body is coaxially arranged on the rotating body, and includes a plurality of permanent magnets arranged alternately with N poles and S poles in the circumferential direction; the excitation winding is arranged on one side of the first permanent magnet ring body, and has an excitation magnetic pole end formed by alternating N poles and S poles; the excitation magnetic pole end is arranged facing the magnetic pole of the first permanent magnet ring body in the radial direction.

[0019] Furthermore, the permanent magnetic suspension assembly includes at least one group of radial permanent magnetic units, at least one group of first axial permanent magnetic units, and at least one group of second axial permanent magnetic units; the radial permanent magnetic units have a magnetic force that constrains the radial movement of the rotating body; the first axial permanent magnetic units have a magnetic force that constrains the rotating body to move toward the first end in the axial direction; and the second axial permanent magnetic units have a magnetic force that constrains the rotating body to move toward the second end in the axial direction.

[0020] Furthermore, the radial permanent magnet unit, the first axial permanent magnet unit and the second axial permanent magnet unit each include two groups of second permanent magnet ring bodies; the two groups of second permanent magnet ring bodies are coaxially arranged, the first group of second permanent magnet ring bodies is coaxially arranged on the rotating body, and the second group of second permanent magnet ring bodies is arranged on the rotating base; the two second permanent magnet ring bodies in the radial permanent magnet unit, the first axial permanent magnet unit and the second axial permanent magnet unit have magnetic poles that are arranged facing each other in the constraint direction and have the same polarity.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0022] 1. The present invention uses a reinstallation device in conjunction with two motors to be tested, and the two motors to be tested are connected to the rotating body through transmission. Under the drive of the electromagnetic drive component, the rotating body is driven to rotate, and then the central axes of the two motors to be tested can be driven to rotate when the brake is not in the braking state, so that the two motors to be tested can be synchronously tested for high-speed forward and reverse endurance, and the test speed of the two motors to be tested can be infinitely adjusted, effectively meeting the requirements of high-speed forward and reverse endurance testing of the motors to be tested. When the brake of the motor to be tested is switched to the braking state, the electromagnetic drive component drives the rotating body to form a motion trend to apply torque to the central axes of the two motors to be tested, and the brake endurance test can be synchronously performed on the two motors to be tested. In the above method, the two motors to be tested can be synchronously tested for endurance, and rapid switching can be performed between the two endurance test items, which is convenient to operate, saves time and effort, and effectively meets the endurance test requirements of the servo motor.

[0023] 2. The present invention uses a sprinkler device and a heating device in combination to place one group of motors to be tested under a simulated environment such as temperature, humidity, and rain, and the other group of motors to be tested under a conventional environment. The two groups of motors to be tested are tested for durability of various items simultaneously, so that the test comparison data under the synchronous test can be fully and comprehensively obtained, so as to fully and truly reflect the brake durability performance of the servo motor, and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a three-dimensional structural schematic diagram of the overall structure of the present invention;

[0026] Figure 2 for Figure 1 Exploded view of;

[0027] Figure 3 for Figure 1 A cross-sectional structural diagram of ;

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the supporting base of the present invention;

[0029] Figure 5 for Figure 4 A schematic diagram of a three-dimensional structure from another perspective;

[0030] Figure 6 It is a schematic diagram of the three-dimensional structure of the cover body of the present invention;

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the rotary device of the present invention;

[0032] Figure 8 for Figure 7 A side view structural schematic diagram of

[0033] Fig. 9 for Figure 8 Sectional view at AA in the figure;

[0034] Fig.10 for Figure 7 Exploded view of;

[0035] Fig.11 It is a schematic diagram of the three-dimensional structure of the rotating body of the present invention;

[0036] Among them: 1. supporting base; 11. containing chamber; 12. drain outlet; 13. plug-in channel; 14. avoidance hole; 2. rotating device; 3. rotating base; 31. rotating body; 4. permanent magnetic suspension component; 41. radial permanent magnetic unit; 42. first axial permanent magnetic unit; 43. second axial permanent magnetic unit; 5. electromagnetic drive component; 51. first permanent magnetic ring body; 52. excitation winding; 6. cover body; 61. sprinkler device; 611. sprinkler pipe; 612. water supply pipe; 62. heating device; 7. opening and closing parts; 71. water receiving container; 8. thermal insulation material; 9. motor to be tested. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0038] like Figure 1-11The figure shows a servo motor durability test device described in this embodiment, which is particularly suitable for high-speed forward and reverse durability testing of servo motors and durability testing of brakes in servo motors.

[0039] The durability test device includes a supporting base 1, a rotating device 2 and other devices or components. The supporting base 1 is a casting, which is fixed on a workbench, and its specific structure and shape are determined according to actual needs. A receiving chamber 11 and a cover body 6 for opening and closing the receiving chamber 11 are arranged on the supporting base 1. The cover body 6 is connected to the supporting base 1 in a freely detachable manner to open and close the receiving chamber 11. When the cover body 6 closes the receiving chamber 11, a closed space is formed inside the receiving chamber 11.

[0040] The rotating device 2 is fixed on the supporting base 1. The rotating device 2 includes components or assemblies such as a rotating base 3, a rotating body 31, a permanent magnetic suspension component 4, and an electromagnetic drive component 5. Among them, the rotating base 3 is installed on the outer side of one end of the receiving chamber 11, and is fixed to the supporting base 1 by bolt connection. A rotating chamber is processed inside the rotating base 3, and an avoidance hole 14 is processed on the side of the receiving chamber 11 corresponding to the rotating base 3. Through the avoidance hole 14, the rotating chamber is connected to the receiving chamber 11. The rotating body 31 is installed in the rotating chamber, which has a central axis of rotation, and has a rotating state rotating around the central axis of rotation. In this rotating state, the rotating body 31 can rotate forward and backward.

[0041] The aforementioned permanent magnetic suspension assembly 4 is installed between the rotating base 3 and the rotating body 31, and has a magnetic force that constrains the rotating body 31 to suspend in the rotating base 3 and form a rotational degree of freedom. Through the magnetic force of the permanent magnetic suspension assembly 4, the rotating body 31 is limited in the rotating chamber in a magnetic suspension manner, and can rotate around its own central axis in the rotating chamber. Specifically, the permanent magnetic suspension assembly 4 includes two groups of radial permanent magnetic units 41, a group of first axial permanent magnetic units 42, and a group of second axial permanent magnetic units 43. The two groups of radial permanent magnetic units 41 are arranged at intervals in the axial direction (central axis direction, the same below) of the rotating body 31. The radial permanent magnetic unit 41 provides a magnetic force that constrains the radial movement of the rotating body 31. The first axial permanent magnetic unit 42 provides a magnetic force that constrains the rotating body 31 to move toward the first end in the axial direction. The second axial permanent magnetic unit 43 provides a magnetic force that constrains the rotating body 31 to move toward the second end in the axial direction. Through the constraints of the radial permanent magnet unit 41 , the first axial permanent magnet unit 42 , and the second axial permanent magnet unit 43 , the movement of the rotating body 31 in the radial direction and the axial direction is restricted to form a suspended state.

[0042] The radial permanent magnet unit 41, the first axial permanent magnet unit 42 and the second axial permanent magnet unit 43 mentioned above all include two groups of second permanent magnet ring bodies. The two groups of second permanent magnet ring bodies are coaxially arranged, the first group of second permanent magnet ring bodies are coaxially mounted on the rotating body 31, and the second group of second permanent magnet ring bodies are mounted on the rotating base 3. The two second permanent magnet ring bodies in the radial permanent magnet unit 41, the first axial permanent magnet unit 42 and the second axial permanent magnet unit 43 have magnetic poles that are arranged facing each other in the constraint direction and have the same polarity. The constraint direction refers to the radial or axial direction of the rotating body 31 (the same below). In this embodiment, the second permanent magnet ring body is composed of a plurality of permanent magnets arranged in a circumferential direction. The plurality of permanent magnets are mounted on the rotating base 3 and the rotating body 31 by embedding. The permanent magnet can withstand a certain high temperature and has an axial N pole and an axial S pole. When specifically arranged, the N pole or S pole of each permanent magnet is arranged in a first end or a second end in the axial direction. For example, the two second permanent magnetic ring bodies of the radial permanent magnetic unit 41 are connected to each other, the first permanent magnetic ring body 51 of the outer ring is fixed on the rotating base 3, and the second permanent magnetic ring body of the inner ring is fixed on the rotating body 31. The second permanent magnetic ring body of the outer ring and the second permanent magnetic ring body of the inner ring are close to each other at the same end in the axial direction, and the polarity of the magnetic poles of the two are the same (both are N poles or both are S poles) to form a magnetic repulsion force. For another example, the two second permanent magnetic ring bodies of the axial permanent magnetic unit are arranged at intervals in the axial direction, one group of the second permanent magnetic ring bodies is fixed on the rotating base 3, and the other group of the second permanent magnetic ring bodies is fixed on the rotating body 31. The ends of the two groups of second permanent magnetic ring bodies that are close to each other form magnetic poles with the same polarity to form a magnetic repulsion force in the axial direction. The magnetic repulsion force formed by the first axial permanent magnetic unit 42 acts on the rotating body 31 in the direction away from the first axial permanent magnetic unit 42, thereby limiting the movement of the rotating body 31 in the direction close to the first axial permanent magnetic unit 42. The arrangement and matching principle of the two second permanent magnetic ring bodies of the second axial permanent magnetic unit 43 are similar to those of the first axial permanent magnetic unit 42 and are not described in detail.

[0043] In the specific design, the first axial permanent magnet unit 42 and the radial permanent magnet unit 41, as well as the second axial permanent magnet unit 43 and the radial permanent magnet unit 41 can share a second permanent magnet ring body installed on the rotating body 31 to reduce manufacturing costs and simplify the overall structure. During manufacturing, the length, width, and height of each permanent magnet of the second permanent magnet ring body can be the same or different.

[0044] The aforementioned electromagnetic drive assembly 5 is installed between the rotating body 31 and the rotating base 3, and is used to drive the rotating body 31 to form the aforementioned rotation state. The electromagnetic drive assembly 5 includes a first permanent magnet ring body 51 and an excitation winding 52. The first permanent magnet ring body 51 is coaxially installed on the rotating body 31, and includes a plurality of groups of permanent magnets arranged alternately with N poles and S poles in the circumferential direction. The permanent magnet can withstand a certain high temperature and has N poles and S poles in the radial direction. The excitation winding 52 in this embodiment can be arranged in two groups or more, and is distributed on the side of the rotating body 31 at intervals along the circumferential direction of the rotating body 31. Each excitation winding 5282 has three coils, which can be excited by current to form an excitation magnetic pole with alternating N poles and S poles. The excitation magnetic pole is arranged facing the magnetic pole of the first permanent magnet ring body 51 in the radial direction. Through the cooperation of the excitation magnetic pole and the magnetic pole of the permanent magnet ring body, a magnetic force that drives the rotating body 31 to rotate is formed. By changing the frequency and phase sequence of the field winding 52 , the rotation speed, direction, position, etc. of the rotating body 31 can be accurately controlled.

[0045] It should be noted that the permanent magnets mentioned above are conventional components in the prior art, having an N pole and an S pole, and the shape, structure and size of each permanent magnet can be determined according to actual design.

[0046] The motors to be tested 9 are respectively installed at both ends of the rotating device 2 on the aforementioned supporting base 1. The central axes of the motors to be tested 9 on both sides are transmission-connected to the rotating body 31 by key connection. During specific installation, the motor to be tested 9 on one side is key-connected to the rotating body 31, and then fixed to the supporting base 1 by bolt connection. The motor to be tested 9 on the other side is arranged in the receiving chamber 11, and its central axis is key-connected to the rotating body 31 via the aforementioned avoidance hole 14, and then fixed to the supporting base 1 by bolt connection.

[0047] A sprinkler device 61 for sprinkling water into the receiving chamber 11 is installed on the cover body 6. The sprinkler device 61 includes a sprinkler pipe 611 distributed on the back of the cover body 6, and a water supply pipe 612 inserted on the cover body 6 and connected to the sprinkler pipe 611. A water-permeable hole is processed on the sprinkler pipe 611 facing the receiving chamber 11. The water supply end of the water supply pipe 612 is exposed on the outside of the cover plate. The water supply pipe 612 is connected to an external water source so that water can be sprinkled or poured on the receiving chamber 11 and the motor 9 to be tested through the water-permeable hole to simulate the humidity or rain environment. A drainage hole connected to the receiving chamber 11 is processed on the supporting base 1. Through the drainage hole, the water accumulated in the receiving chamber 11 can be discharged. A plug-in channel 13 connected to the drainage hole is processed on the supporting base 1. An opening and closing member 7 is arranged corresponding to the plug-in channel 13, and the opening and closing member 7 is a long rod structure. The drain hole can be closed by inserting the opening and closing member 7 into the insertion channel 13, and the drain hole can be opened by pulling out the opening and closing member 7. On the supporting base 1, a water-saving container is arranged beside the drain hole to receive water discharged through the drain hole.

[0048] In addition, a heating device 62 is installed on the cover 6. When the cover 6 is sealed on the receiving chamber 11, the heating device 62 is placed in the receiving chamber 11 to heat the air in the receiving chamber 11, thereby simulating the temperature environment. The heating device 62 is preferably a PTC heater.

[0049] In this embodiment, a heat insulating material 8 is installed between the aforementioned rotary base 3 and the towing base to minimize the temperature in the receiving chamber 11 from being transferred to the rotary device 2. The heat insulating material 8 is a conventional material in the prior art and can be a porous heat insulating board. In addition, the structural design of the rotary device 2 can withstand high temperatures of 80°C and above and rain erosion, so as to effectively improve the service life of the entire device.

[0050] When in use, the central axes of the two motors 9 to be tested are connected to the rotating body 31 by key connection, and fixed to the supporting base 1 by bolts. When performing a high-speed forward and reverse endurance test, the brakes of the two motors 9 to be tested are in an unbraked state. Driven by the electromagnetic drive component 5, the rotating body 31 is driven to rotate, and then the central axes of the two motors 9 to be tested can be driven to rotate, so that the two motors 9 to be tested can be synchronously tested for high-speed forward and reverse endurance. By adjusting the frequency and phase sequence of the electromagnetic drive component 5, the test speed of the two motors 9 to be tested can be adjusted.

[0051] When performing a brake durability test, the brake of the motor 9 to be tested is switched to a braking state, and the electromagnetic drive assembly 5 drives the rotating body 31 to form a movement trend to apply torque to the central axes of the two motors 9 to be tested, so that the brake durability test can be performed on the two motors 9 to be tested synchronously.

[0052] In the above two test items, the durability test can be performed on the two motors 9 to be tested simultaneously, and the two durability test items can be quickly switched, which is convenient to operate, saves time and effort, and effectively meets the durability test requirements of the servo motor.

[0053] In the above two test items, the sprinkler 61 and / or the heating device 62 are started to test one group of motors 9 under simulated environments such as temperature, humidity, and rain, and the other group of motors 9 under normal conditions. The two groups of motors 9 under test are tested synchronously for durability tests of various items, so that the test comparison data under the synchronous test can be fully and comprehensively obtained, so as to fully and truly reflect the brake durability performance of the servo motor.

[0054] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A servo motor durability test device, comprising a supporting base and a rotating device; characterized in that: The rotating device comprises a rotating base, a rotating body, a permanent magnetic suspension component, and an electromagnetic drive component; The rotating base is arranged on the supporting base; the rotating body is arranged in the rotating base, has a rotating center axis, and has a rotating state rotating around the rotating center axis; The permanent magnetic suspension assembly is arranged between the rotating base and the rotating body, and has a magnetic force that constrains the rotating body to be suspended in the rotating base and forms a rotational degree of freedom; The electromagnetic driving assembly is arranged between the rotating body and the rotating base, and is used to drive the rotating body to form the rotating state; The two ends of the rotating device on the supporting base are respectively provided with motors to be tested; the central axis of the motor to be tested is drivingly connected with the rotating body; The permanent magnetic suspension assembly includes at least one group of radial permanent magnetic units, at least one group of first axial permanent magnetic units, and at least one group of second axial permanent magnetic units; the radial permanent magnetic units have a magnetic force that constrains the radial movement of the rotating body; the first axial permanent magnetic units have a magnetic force that constrains the rotating body to move toward the first end in the axial direction; the second axial permanent magnetic units have a magnetic force that constrains the rotating body to move toward the second end in the axial direction.

2. A servo motor durability testing device according to claim 1, characterized in that: The supporting base is provided with a receiving chamber and a cover for opening and closing the receiving chamber; one group of the motors to be tested is arranged in the receiving chamber.

3. A servo motor durability testing device according to claim 2, characterized in that: The cover body is provided with a watering device for spraying water into the receiving chamber.

4. A servo motor durability testing device according to claim 3, characterized in that: The watering device comprises a watering pipe distributed on the back of the cover body, and a water supply pipe inserted on the cover body and connected with the watering pipe; a water permeable hole is arranged on the watering pipe facing the receiving chamber.

5. The servo motor durability testing device according to claim 3, characterized in that: The supporting base is provided with a drainage hole communicated with the receiving chamber and an opening and closing member for opening and closing the drainage hole.

6. A servo motor durability testing device according to claim 2, characterized in that: The cover body is provided with a heating device for heating the air in the receiving chamber.

7. A servo motor durability testing device according to claim 1, characterized in that: The electromagnetic drive component includes a first permanent magnet ring body and an excitation winding; the first permanent magnet ring body is coaxially arranged on a rotating body, and includes a plurality of permanent magnets arranged alternately with N poles and S poles in a circumferential direction; the excitation winding is arranged on one side of the first permanent magnet ring body, and has an excitation magnetic pole end formed by alternating N poles and S poles; the excitation magnetic pole end is arranged facing the magnetic pole of the first permanent magnet ring body in the radial direction.

8. The servo motor durability testing device according to claim 1, characterized in that: The radial permanent magnet unit, the first axial permanent magnet unit and the second axial permanent magnet unit each include two groups of second permanent magnet ring bodies; the two groups of second permanent magnet ring bodies are coaxially arranged, the first group of second permanent magnet ring bodies are coaxially arranged on the rotating body, and the second group of second permanent magnet ring bodies are arranged on the rotating base; the two second permanent magnet ring bodies in the radial permanent magnet unit, the first axial permanent magnet unit and the second axial permanent magnet unit have magnetic poles that are arranged facing each other in the constraint direction and have the same polarity.

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