Axial electromagnetic suspension bearing testing device

Abstract

The utility model discloses an axial electromagnetic suspension bearing testing device, which comprises a first positioning clamp, a second positioning clamp, a driving device, a force sensor, a force display and an adjustable direct current power supply, the second positioning clamp is used for fixing a permanent magnet in the axial electromagnetic suspension bearing and enabling the permanent magnet and the electromagnet to be coaxially distributed; the driving device is used for driving the first positioning clamp or the second positioning clamp to do linear motion so as to change the distance between the electromagnet and the permanent magnet and can obtain a driving displacement value; the force sensor is used for detecting magnetic acting force between the electromagnet and the permanent magnet when the electromagnet is electrified; the force display is used for displaying a force value detected by the force sensor; the adjustable direct-current power supply is used for supplying power to the electromagnet and the force display. According to the utility model, the corresponding relation among the magnetic acting force, the displacement and the voltage can be accurately measured, different test requirements are met, the structure is simple, and the operation is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic suspension bearings, and particularly relates to a test device for an axial electromagnetic suspension bearing. Background Art

[0002] With the development of technology, the application of electromagnetic suspension technology is becoming increasingly widespread. Especially for axial electromagnetic suspension bearings, as a non-contact support component, axial electromagnetic suspension bearings have the advantages of no friction, no need for lubrication, and stable high-speed operation, and have been maturely applied in the industrial and medical fields.

[0003] However, the performance and reliability of axial electromagnetic suspension bearings largely depend on their design, manufacturing process, and the rationality of control strategies. For example, in the currently mainstream third-generation fully magnetic levitation blood pump, the axial electromagnetic suspension bearing technology is applied. In the PID control design of the electromagnet in the axial electromagnetic suspension bearing, it is necessary to test the relationship between its voltage, magnetic force, and displacement to help achieve the purpose of PID control. Therefore, it is necessary to conduct precise and comprehensive tests on it.

[0004] When traditional test devices face the test requirements of axial electromagnetic suspension bearings, there are many deficiencies. On the one hand, some test devices are complex to operate, with limited precision and resolution, and it is difficult to accurately capture the performance parameters under small displacements and dynamic changes, resulting in the accuracy and reliability of test results being affected. On the other hand, the functions of existing test devices are relatively single, and they can only measure a certain specific key parameter, and cannot comprehensively evaluate the comprehensive performance of axial electromagnetic suspension bearings, including electromagnetic force characteristics, displacement response, working voltage magnitude, etc. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the Utility Model

[0005] The problem to be solved by the utility model is to provide a test device for an axial electromagnetic suspension bearing to overcome the defects of the existing test device for an axial electromagnetic suspension bearing, such as complex operation, single function, and inability to comprehensively test the corresponding relationship between various parameters of the axial electromagnetic suspension bearing.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a test device for an axial electromagnetic suspension bearing, comprising:

[0007] A first positioning fixture for fixing the electromagnet in the axial electromagnetic suspension bearing;

[0008] A second positioning fixture for fixing the permanent magnet in the axial electromagnetic suspension bearing and making the permanent magnet coaxially distributed opposite to the electromagnet;

[0009] A driving device for driving the first positioning fixture or the second positioning fixture to move linearly to change the distance between the electromagnet and the permanent magnet, and capable of obtaining the driving displacement value;

[0010] A force sensor for detecting the magnetic force between the electromagnet and the permanent magnet when the electromagnet is energized;

[0011] A force display electrically connected to the force sensor for displaying the force value detected by the force sensor;

[0012] And an adjustable DC power supply for supplying power to the electromagnet and the force display.

[0013] As a further improvement of the present invention, the first positioning fixture includes an electromagnet mounting block and a pressing mechanism. The electromagnet mounting block is fixed to the bottom plate of the testing device in the vertical direction. The electromagnet mounting block is provided with a first positioning groove. The electromagnet is installed in the first positioning groove, and the magnetic action end of the electromagnet faces the permanent magnet and is exposed from the electromagnet mounting block. The pressing mechanism is used to press the electromagnet in the first positioning groove.

[0014] As a further improvement of the present invention, the pressing mechanism includes a pressing adjustment screw and a screw mounting block. The screw mounting block is fixed to the bottom plate in the vertical direction and is located on one side of the electromagnet mounting block. The pressing adjustment screw is threadedly connected to the screw hole of the electromagnet mounting block in the horizontal direction, and one end of the pressing adjustment screw abuts against the electromagnet.

[0015] As a further improvement of the present invention, a vertical plate is also fixed on the bottom plate. A guide post is connected between the vertical plate and the electromagnet mounting block. The second positioning fixture is slidably fitted on the guide post.

[0016] As a further improvement of the present invention, the second positioning fixture includes a first mounting block slidably fitted on the guide post. The first mounting block is provided with a shaft clamping portion, and the shaft clamping portion is provided with a second positioning groove. The permanent magnet is installed in the second positioning groove and is clamped and fixed by the shaft clamping portion.

[0017] As a further improvement of the present invention, the second positioning fixture further includes a second mounting block slidably fitted on the guide post. The force sensor is installed between the first mounting block and the second mounting block.

[0018] As a further improvement of the present invention, the force sensor is connected to the first mounting block or the second mounting block through a floating joint.

[0019] As a further improvement of the present utility model, the driving device is a digital micrometer, which is fixedly installed on the vertical plate, and the measuring rod of the digital micrometer is fixedly connected to the second mounting block.

[0020] As a further improvement of the present utility model, the force sensor is a tensile and compressive force sensor, which is used to detect the suction or repulsion force between the electromagnet and the permanent magnet when the electromagnet is energized.

[0021] As a further improvement of the present utility model, the first positioning fixture and the second positioning fixture are made of non-magnetic metal materials or engineering plastics.

[0022] The beneficial effects of the present utility model are as follows: The present utility model provides an axial electromagnetic suspension bearing testing device. By fixing the electromagnet of the axial electromagnetic suspension bearing on the first positioning fixture and fixing the permanent magnet of the axial electromagnetic suspension bearing on the second positioning fixture, and supplying power to the electromagnet through an adjustable DC power supply, the magnetic force between the electromagnet and the permanent magnet is detected by a force sensor, and the detected force value is displayed on a force display. According to different test requirements, the corresponding relationship among the magnetic force, displacement, and voltage can be accurately measured to meet different test requirements. Based on the data obtained from the test, the design of the axial electromagnetic suspension bearing can be optimized to improve its performance, such as improving the suction stability and reducing the hysteresis effect, etc., providing strong support for the technical research and development of axial electromagnetic suspension bearings and related fields, contributing to the promotion of the progress and innovation of related technologies. At the same time, the testing device has a simple structure, is easy to operate, has low requirements for operators, reduces the test cost, and improves the test efficiency. Description of the Drawings

[0023] Figure 1 is a perspective view of the axial electromagnetic suspension bearing testing device of the present utility model;

[0024] Figure 2 is a perspective view of the axial electromagnetic suspension bearing testing device of the present utility model after removing the workbench and the adjustable DC power supply;

[0025] Figure 3 is an exploded view of the axial electromagnetic suspension bearing testing device of the present utility model after removing the workbench, the force display, and the adjustable DC power supply;

[0026] Figure 4 is a perspective view of the first positioning fixture and the second positioning fixture in the present utility model.

[0027] The following description is made in conjunction with the drawings:

[0028] 1. Electromagnet; 2. Permanent magnet; 3. Driving device; 4. Force sensor; 5. Force display; 6. Adjustable DC power supply; 7. Electromagnet mounting block; 701. First positioning groove; 8. Base plate; 9. Compression adjustment screw; 10. Screw mounting block; 11. Vertical plate; 12. Guide post; 13. Mounting block one; 131. Shaft clamping part; 1311. Second positioning groove; 14. Mounting block two; 15. Floating joint; 100. Workbench. Detailed implementation mode

[0029] The following combines the drawings to make a detailed description of the preferred embodiments of the present invention.

[0030] The present invention provides an axial electromagnetic suspension bearing test device for testing an axial electromagnetic suspension bearing, wherein the axial electromagnetic suspension bearing includes an electromagnet and a permanent magnet, and the electromagnet and the permanent magnet are axially spaced and oppositely arranged.

[0031] Refer to Figures 1 to 4 , the axial electromagnetic suspension bearing test device of the present invention includes: a workbench 100 and a first positioning fixture, a second positioning fixture, a driving device 3, a force sensor 4, a force display 5 and an adjustable DC power supply 6 all installed on the workbench 100.

[0032] In the present invention, the first positioning fixture and the second positioning fixture are horizontally oppositely arranged, and one of them can move linearly relative to the other. The first positioning fixture is used to fix the electromagnet 1 in the axial electromagnetic suspension bearing, and the second positioning fixture is used to fix the permanent magnet 2 in the axial electromagnetic suspension bearing, and can ensure that the permanent magnet 2 and the electromagnet 1 are coaxially and oppositely distributed to ensure the accuracy and effectiveness of the test results. The driving device 3 is used to drive the first positioning fixture or the second positioning fixture to move linearly to change the distance between the electromagnet 1 and the permanent magnet 2, and the driving device 3 can obtain the displacement value of driving the first positioning fixture or the second positioning fixture.

[0033] Further, the force display 5 is electrically connected to the force sensor 4. The force sensor 4 is used to detect the magnetic force between the electromagnet 1 and the permanent magnet 2 when the electromagnet 1 is energized, and the force display 5 is used to display the force value detected by the force sensor 4. The adjustable DC power supply 6 is used to supply power to the electromagnet 1 and the force display 5, and the supply voltage of the electromagnet 1 can be changed by adjusting the adjustable DC power supply 6.

[0034] During the test, the electromagnet 1 is fixed on the first positioning fixture, the permanent magnet 2 is fixed on the second positioning fixture, the electromagnet 1 is powered by the adjustable DC power supply 6, the magnetic force between the electromagnet 1 and the permanent magnet 2 is detected by the force sensor 4, and the detected force value is displayed on the force display 5; according to different test requirements, the relationship between any two of the magnetic force, displacement, and voltage can be tested, for example:

[0035] With the displacements of the electromagnet 1 and the permanent magnet 2 remaining unchanged, the supply voltage of the electromagnet 1 is changed by adjusting the adjustable DC power supply 6, and the data of the magnetic force between the electromagnet 1 and the permanent magnet 2 varying with the supply voltage are obtained;

[0036] With the supply voltage of the electromagnet 1 remaining unchanged, the displacement of the electromagnet 1 or the permanent magnet 2 is changed by the driving device 3, and the data of the magnetic force between the electromagnet 1 and the permanent magnet 2 varying with the displacement are obtained;

[0037] With the magnetic force between the electromagnet 1 and the permanent magnet 2 remaining unchanged, the displacement of the electromagnet 1 or the permanent magnet 2 is changed by the driving device 3, and at the same time the supply voltage of the electromagnet 1 is changed by adjusting the adjustable DC power supply 6, and the data of the supply voltage varying with the displacement are obtained.

[0038] It can be seen that the test device for the axial electromagnetic suspension bearing of the present utility model can accurately measure the corresponding relationship among the magnetic force, displacement, and voltage, meet different test requirements. According to the data obtained from the test, the design of the axial electromagnetic suspension bearing can be optimized and its performance can be improved, such as improving the suction stability and reducing the hysteresis effect, etc., providing strong support for the technical research and development of the axial electromagnetic suspension bearing and related fields, contributing to the promotion of the progress and innovation of related technologies. At the same time, the test device has a simple structure, is easy to operate, and has low requirements for operators.

[0039] As Figure 1 shown, a base plate 8 is fixed on the workbench 100, and the first positioning fixture, the second positioning fixture, the driving device 3, and the force display 5 are all installed on the base plate 8.

[0040] Among them, the first positioning fixture includes an electromagnet mounting block 7 and a pressing mechanism. The electromagnet mounting block 7 is fixed on the base plate 8 in the vertical direction, and the electromagnet mounting block 7 is provided with a first positioning groove 701. For the convenience of understanding, the long side direction of the workbench 100 is defined as the left - right direction below. The first positioning groove 701 runs through the left and right sides of the electromagnet mounting block 7, and the first positioning groove 701 is a stepped groove with the inner diameter of the left half greater than that of the right half. The left half of the first positioning groove 701 is adapted to the electromagnet 1, and the electromagnet 1 is installed in the left half of the first positioning groove 701, and the magnetic action end of the electromagnet 1 faces the permanent magnet 2 through the right half and is exposed outside the electromagnet mounting block 7, ensuring that the magnetic force between the electromagnet 1 and the permanent magnet 2 is not affected.

[0041] Refer to Figure 2 and Figure 3, the pressing mechanism is used to press the electromagnet 1 into the first positioning groove 701. Specifically, the pressing mechanism includes a pressing adjustment screw 9 and a screw mounting block 10. The screw mounting block 10 is fixed to the bottom plate 8 in the vertical direction and is located on the left side of the electromagnet mounting block 7. The screw mounting block 10 is provided with a threaded hole, and the pressing adjustment screw 9 is threadedly connected to the threaded hole of the electromagnet mounting block 7 in the horizontal direction. By rotating the pressing adjustment screw 9, one end of the pressing adjustment screw 9 abuts against the electromagnet 1 with appropriate pressure to achieve reliable and accurate fixation of the electromagnet 1, and the operation is convenient and fast.

[0042] Furthermore, a vertical plate 11 is also fixed on the bottom plate 8. The vertical plate 11 is located on the right side of the electromagnet mounting block 7, and there are but not limited to two guide posts 12 connected between the vertical plate 11 and the electromagnet mounting block 7. The second positioning fixture is slidably fitted on the guide posts 12.

[0043] Refer to Figure 4 , the second positioning fixture includes a first mounting block 13. The first mounting block 13 is slidably fitted on the guide posts 12 through linear bearings. In this embodiment, the first mounting block 13 is U-shaped, its left side plate is provided with a shaft clamping portion 131, and the shaft clamping portion 131 is provided with a second positioning groove 1311 matching the permanent magnet 2. The permanent magnet 2 is installed in the second positioning groove 1311, and the permanent magnet 2 is clamped and fixed by tightening the screw on the shaft clamping portion 131.

[0044] In addition, the second positioning fixture further includes a second mounting block 14. The second mounting block 14 is also slidably fitted on the guide posts 12 through linear bearings and is located on the right side of the first mounting block 13. The force sensor 4 is installed between the first mounting block 13 and the second mounting block 14.

[0045] It is worth mentioning that the force sensor 4 is connected to the first mounting block 13 or the second mounting block 14 through a floating joint 15. In this embodiment, specifically, the right end of the force sensor 4 is connected to the second mounting block 14 through a floating joint 15, and the left end of the force sensor 4 is fixedly connected to the right side plate of the first mounting block 13. The force sensor 4 in the present utility model is connected to the second mounting block 14 through a floating joint 15, which can compensate for installation deviation, ensure that the force sensor 4 can accurately receive force signals, and improve measurement accuracy.

[0046] Among them, the force sensor 4 is a tension and compression sensor, which has the function of detecting both tension and pressure. That is to say, by changing the current direction of the electromagnet 1, the force sensor 4 can be used to detect both the suction force between the electromagnet 1 and the permanent magnet 2 when the electromagnet 1 is energized and the repulsive force between the electromagnet 1 and the permanent magnet 2 when the electromagnet 1 is energized.

[0047] In this embodiment, the driving device 3 specifically adopts a digital display micrometer, which is fixedly installed on the vertical plate 11 in the horizontal direction. The digital display micrometer has a measuring rod, and its measuring rod passes through the vertical plate 11 and is fixedly connected to the second mounting block 14. By manually rotating the digital display micrometer, its measuring rod extends or retracts, and then drives the first mounting block 13 and the permanent magnet 2 to slide left and right on the guide post 12 through the second mounting block 14. And the tester can directly read the displacement value of the permanent magnet 2 from the digital display module on the digital display micrometer.

[0048] Of course, in other embodiments of the present invention, the driving device 3 can also adopt a linear motor, etc., to achieve automatic driving according to the set displacement parameters.

[0049] In order to avoid interfering with the magnetic force between the electromagnet 1 and the permanent magnet 2, the materials of the first positioning fixture and the second positioning fixture in the present invention are both non-magnetic metal materials or engineering plastics. In this embodiment, aluminum material is specifically adopted.

[0050] It should be noted that although in this embodiment, the first positioning fixture, that is, the electromagnet 1, is fixed, and the second positioning fixture, that is, the permanent magnet 2, is movable and displaced by the driving of the driving device 3, it does not mean that the present invention is limited to this. In other embodiments of the present invention, the permanent magnet 2 can also be set to be fixed, and the electromagnet 1 can be set to be movable and displaced by the driving of the driving device 3.

[0051] This embodiment adopts an adjustable DC power supply 6 of 0-36V, and there are two of them. One is used to supply power to the electromagnet 1, and the other is used to supply power to the force display 5. Of course, in other embodiments of the present invention, an adjustable DC power supply 6 with multiple outputs can also be adopted to supply power to the electromagnet 1 and the force display 5 at the same time.

[0052] The test process of this embodiment is as follows:

[0053] Place the electromagnet 1 in the electromagnet mounting block 7, and rotate the pressing adjustment screw 9 to press the electromagnet 1 tightly; place the permanent magnet 2 in the first mounting block 13 and clamp it through the shaft clamping part 131; adjust the digital display micrometer to make the permanent magnet 2 move left to closely adhere to the electromagnet 1, and press the "zero setting" button on the digital display micrometer; then adjust the digital display micrometer again to make the permanent magnet 2 move right to reach the initial test position; connect the electromagnet 1 and the force display 5 to the adjustable DC power supply 6 respectively, first conduct a suction force test, adjust the voltage of the electromagnet 1 to the initial test voltage, and check the value on the force display 5; according to the above three test requirements, test the relationship between any two of the magnetic force, displacement, and voltage. After the suction force test, change the current direction of the electromagnet 1 and then conduct a repulsion force test.

[0054] It can be seen that the axial electromagnetic suspension bearing test device of the present utility model fixes the electromagnet 1 of the axial electromagnetic suspension bearing on the first positioning fixture, fixes the permanent magnet 2 of the axial electromagnetic suspension bearing on the second positioning fixture, supplies power to the electromagnet 1 through the adjustable DC power supply 6, uses the force sensor 4 to detect the magnetic force between the electromagnet 1 and the permanent magnet 2, and displays the detected force value on the force display 5. According to different test requirements, it can accurately measure the corresponding relationship among the magnetic force, displacement, and voltage, meet different test requirements. According to the data obtained from the test, the design of the axial electromagnetic suspension bearing can be optimized and its performance can be improved, such as improving the suction stability and reducing the hysteresis effect, etc., providing strong support for the technical research and development of axial electromagnetic suspension bearings and related fields, contributing to the promotion of the progress and innovation of related technologies. At the same time, the test device has a simple structure, is easy to operate, has low requirements for operators, reduces the test cost, and improves the test efficiency.

[0055] Many specific details are set forth in the above description to facilitate a full understanding of the present utility model. However, the above description is only a preferred embodiment of the present utility model, and the present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes. All those without departing from the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model shall still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. An axial electromagnetic suspension bearing test device, characterized in that: include: A first positioning fixture, used for fixing the electromagnet (1) in the axial electromagnetic suspension bearing; A second positioning fixture, used for fixing the permanent magnet (2) in the axial electromagnetic suspension bearing, and making the permanent magnet (2) and the electromagnet (1) coaxially distributed relative to each other; A driving device (3) for driving the first positioning fixture or the second positioning fixture to perform linear motion so as to change the distance between the electromagnet (1) and the permanent magnet (2), and to obtain a driving displacement value; A force sensor (4) for detecting the magnetic force between the electromagnet (1) and the permanent magnet (2) when power is supplied to the electromagnet (1); A force display (5), electrically connected to the force sensor (4), and used to display the force value detected by the force sensor (4); and an adjustable direct current power supply (6) for supplying power to the electromagnet (1) and the force display (5).

2. The axial electromagnetic suspension bearing testing device according to claim 1 is characterized in that: The first positioning fixture comprises an electromagnet mounting block (7) and a clamping mechanism, wherein the electromagnet mounting block (7) is fixed on a bottom plate (8) of the test device in a vertical direction, the electromagnet mounting block (7) is provided with a first positioning groove (701), the electromagnet (1) is mounted in the first positioning groove (701), and the magnetic action end of the electromagnet (1) is exposed from the electromagnet mounting block (7) toward the permanent magnet (2), and the clamping mechanism is used to clamp the electromagnet (1) in the first positioning groove (701).

3. The axial electromagnetic suspension bearing testing device according to claim 2 is characterized in that: The clamping mechanism comprises a clamping adjustment screw (9) and a screw mounting block (10); the screw mounting block (10) is fixed on the base plate (8) in a vertical direction and is located on one side of the electromagnet mounting block (7); the clamping adjustment screw (9) is threadedly connected in a screw hole of the electromagnet mounting block (7) in a horizontal direction, and one end of the clamping adjustment screw (9) abuts against the electromagnet (1).

4. The axial electromagnetic suspension bearing testing device according to claim 2 is characterized in that: A vertical plate (11) is also fixed on the bottom plate (8), a guide column (12) is connected between the vertical plate (11) and the electromagnet mounting block (7), and the second positioning fixture is slidably mounted on the guide column (12).

5. The axial electromagnetic suspension bearing testing device according to claim 4 is characterized in that: The second positioning fixture comprises a mounting block (13) slidably mounted on the guide column (12); the mounting block (13) is provided with a shaft clamping portion (131), and the shaft clamping portion (131) is provided with a second positioning groove (1311); the permanent magnet (2) is mounted in the second positioning groove (1311) and is clamped and fixed by the shaft clamping portion (131).

6. The axial electromagnetic suspension bearing testing device according to claim 5, characterized in that: The second positioning fixture also includes a second mounting block (14) slidably mounted on the guide column (12), and the force sensor (4) is mounted between the first mounting block (13) and the second mounting block (14).

7. The axial electromagnetic suspension bearing testing device according to claim 6 is characterized in that: The force sensor (4) is connected to the mounting block one (13) or the mounting block two (14) via a floating joint (15).

8. The axial electromagnetic suspension bearing testing device according to claim 6 is characterized in that: The driving device (3) is a digital micrometer, which is fixedly mounted on the vertical plate (11), and the measuring rod of the digital micrometer is fixedly connected to the second mounting block (14).

9. The axial electromagnetic suspension bearing testing device according to claim 1, characterized in that: The force sensor (4) is a tension pressure sensor, which is used to detect the attraction or repulsion between the electromagnet (1) and the permanent magnet (2) when power is supplied.

10. The axial electromagnetic suspension bearing testing device according to claim 1, characterized in that: The first positioning fixture and the second positioning fixture are made of non-magnetic metal material or engineering plastic.

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