A magnetic bearing detection device

Abstract

The utility model provides a kind of magnetic suspension bearing detection device, belong to magnetic suspension bearing detection technical field, the magnetic suspension bearing detection device includes the axial force loading system being set on the rack, further include axial force sensor and turntable bearing, the output end of axial force loading system is connected axial force sensor and turntable bearing in proper order, the outer ring of turntable bearing is fixedly connected with axial force sensor;Axial force loading system applies axial force to the rotating shaft of the magnetic suspension bearing to be detected by the outer ring of turntable bearing, the axial force sensor between the output end of axial force loading system and turntable bearing accurately measures actual axial force applied on the rotating shaft of the magnetic suspension bearing to be detected, avoid the influence of axial force loading system to rotor radial position and the test precision drop caused by axial force loading system and rotor resonance.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic levitation bearing testing technology, and specifically relates to a magnetic levitation bearing testing device. Background Technology

[0002] Magnetic levitation bearings include an axial magnetic bearing stator, a rotor, a displacement sensor, and a power amplifier. Testing the axial force of a magnetic levitation bearing typically involves applying a precise and controllable axial force to the rotor using an axial force loading system within a force measuring device. A force sensor is connected in series between the axial force loading system and the rotor to accurately measure the actual axial force applied to the rotor. For a detailed testing process, refer to Chinese Patent No. CN223412973U, "An Axial Force Testing Device for Magnetic Levitation Bearings." However, this testing method, by applying an axial force to the rotor, experiences radial position fluctuations and radial electromagnetic force fluctuations, resulting in axial position and force fluctuations. Axial misalignment generates additional radial torque, causing resonance between the rotor and the force measuring device, thus reducing the accuracy of the force measurement. This problem is particularly severe under heavy loads. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to provide a magnetic levitation bearing testing device that avoids radial position fluctuations of the rotor when force is applied to the rotor, while ensuring that the output end of the axial force loading system is aligned with the output shaft of the bearing, thereby improving the accuracy of axial force testing.

[0004] This utility model discloses a magnetic levitation bearing testing device, including a frame and an axial force loading system, the axial force loading system being mounted on the frame; it also includes an axial force sensor and a turntable bearing, the output end of the axial force loading system being sequentially connected to the axial force sensor and the turntable bearing, the outer ring of the turntable bearing being fixedly connected to the axial force sensor.

[0005] The output shaft of the magnetic levitation bearing under test is connected to the inner ring of the turntable bearing, driving the inner ring to rotate and ensuring the working state of the magnetic levitation bearing under test. The output end of the axial force loading system is connected to the outer ring of the turntable bearing. The axial force loading system applies axial force to the rotating shaft of the magnetic levitation bearing under test through the outer ring of the turntable bearing. The axial force sensor between the output end of the axial force loading system and the turntable bearing accurately measures the actual axial force applied to the rotating shaft of the magnetic levitation bearing under test, avoiding the influence of the axial force loading system on the radial position of the rotor.

[0006] Furthermore, it also includes an elastic element, one end of which is connected to the inner ring of the turntable bearing. The elastic element absorbs the impact of the axial force loading system on the bearing under test, suppressing resonance transmitted to the axial force sensor and reducing measurement errors caused by resonance.

[0007] Furthermore, the frame includes a horizontally arranged tray and a vertically arranged opposing upright plate; the opposing upright plate is provided with a corresponding vertical through groove, the axial force loading system is arranged on the tray, and the two ends of the tray are respectively connected to the through groove.

[0008] The tray moves up and down along the through groove on the upright plate to adjust the height of the axial force loading system on the tray, so that the output end of the axial loading system is at the same height as the output shaft of the bearing under test, thus avoiding eccentricity from affecting the accuracy of the axial force test.

[0009] Furthermore, the tray is provided with a guide rail and a fixing member. The guide rail is perpendicular to the axial loading direction of the axial force loading system. The axial force loading system is slidably connected to the guide rail, and the fixing member fixes the axial force loading system to the guide rail.

[0010] The axial force loading system moves along the guide rail on the tray. Under the premise of height alignment, the output end of the axial loading system is aligned horizontally with the output shaft of the bearing under test, so that the loading force coincides with the axis of the bearing, avoiding the generation of additional radial torque and further improving the measurement accuracy.

[0011] Furthermore, the frame is also provided with a support member, which is arranged along the axial loading direction of the axial force loading system. One end of the support member abuts against the axial force loading system, and the other end is away from the output shaft of the axial force loading system and connected to the through groove.

[0012] By bearing the reverse axial force of the axial force loading system in the support component, the deformation of the frame under large axial force is reduced, thereby suppressing the axial vibration of the entire measuring device and reducing the fluctuation of the data collected by the axial force sensor.

[0013] Furthermore, the axial force loading system is a trapezoidal threaded screw with a pitch of 6mm and a stroke ratio of 24 / 1.

[0014] The rotating turntable drives a trapezoidal threaded screw to apply a loading force to the output shaft of the bearing under test. The screw has a 6mm pitch and a stroke ratio of 24 / 1. The turntable moves 0.25mm axially per revolution. The screw can slowly apply axial force, move in both directions, and self-lock in both directions, ensuring the static or quasi-static axial force provided by the axial loading system and reducing the decrease in force measurement accuracy caused by the vibration of the axial loading system.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The axial force loading system provided by this utility model converts rotation and axial movement into axial movement through a turntable bearing, reducing the influence of rotational motion on the rotor of the bearing under test and avoiding the influence of the axial force loading system on the radial position of the rotor. It accurately measures the actual axial force on the rotating shaft of the bearing under test. By adjusting the alignment of the test end of the axial force loading system with the output shaft of the bearing under test, the additional torque caused by misalignment on the radial position of the bearing under test is avoided, thus reducing the detection error. By using elastic elements and selecting an axial force loading system that can achieve slow loading, the loading force fluctuation caused by resonance between the magnetic levitation bearing detection device and the motor rotor is reduced, further improving the detection accuracy. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the magnetic levitation bearing detection device according to an embodiment of the present invention; Figure 2 This is a front view of the magnetic levitation bearing detection device according to an embodiment of the present invention; Figure 3 yes Figure 2 Enlarged view at point I; Figure 4 This is a perspective view of the first connector according to an embodiment of the present utility model; Figure 5 This is a perspective view of the second connector according to an embodiment of the present utility model; Figure 6 This is a perspective view of the axial force loading system according to an embodiment of the present invention; Figure 7 This is a perspective view of the frame according to an embodiment of the present utility model; Figure 8 This is a perspective view of the tray according to an embodiment of the present utility model; Figure 9 This is a perspective view of the fastener according to an embodiment of the present utility model.

[0017] Explanation of reference numerals in the attached figures: 001. Bearing to be tested; 1. Elastic element; 2. Turntable bearing; 3. First connecting part; 4. Axial force sensor; 5. Second connecting part; 6. Frame; 601. Vertical plate; 602. Through groove; 7. Axial force loading system; 701. Turntable; 7A. Output end; 8. Support base; 9. Support component; 10. Tray; 11. Fixing component; Detailed Implementation

[0018] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model. It should be noted that the terms "set," "connect," and "install" should be interpreted broadly, for example, referring to direct connection, indirect connection, or integral connection. Those skilled in the art will understand the specific meaning of the above terms in this utility model according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "left," "right," and similar expressions are for illustrative purposes only and do not represent the only embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains.

[0019] like Figure 1 As shown, this utility model provides a magnetic levitation bearing detection device, such as... Figure 2 As shown, the magnetic levitation bearing 001 to be tested is located in the magnetic levitation motor and is placed at the left end of the magnetic levitation bearing testing device. See also Figure 1-3 Elastic element 1 is disposed between the output shaft of the magnetic levitation bearing 001 in the magnetic levitation motor and the detection end of the magnetic levitation bearing detection device. It is used to isolate the dynamic force transmitted from the motor to the magnetic levitation bearing detection device, preventing resonance between the motor and the force measuring device. Elastic element 1 can be a block or cylinder made of damping and vibration-isolating materials such as rubber. Please refer to [link to relevant documentation]. Figure 1-6 The turntable bearings 2 are connected in series as follows: Figure 4 The first connecting piece 3 and the axial force sensor 4 shown are as follows: Figure 5 The second connecting piece 5 and the output end 7A of the axial force loading system 7 are shown. The output shaft of the magnetic levitation bearing 001 to be tested is connected to the inner ring of the turntable bearing 2, driving the inner ring to rotate to ensure the working state of the magnetic levitation bearing 001 to be tested. The output end of the axial force loading system 7 is connected to the outer ring of the turntable bearing 2. The axial force loading system 7 tests the rotating shaft of the magnetic levitation bearing 001 to be tested through the turntable bearing 2, avoiding the influence of axial force on the radial position of the rotor.

[0020] Figure 6The axial force loading system 7 is a trapezoidal threaded screw with a pitch of 6mm and a stroke ratio of 24 / 1. Loading is applied to the trapezoidal threaded screw via a turntable 701. The axial force loading system 7 with a turntable, using a 6mm pitch trapezoidal threaded screw and a stroke conversion module with a stroke ratio of 24 / 1, achieves a minute axial displacement of 0.25mm for each revolution of the turntable 701. This improves the force measurement resolution of the axial force sensor 4, thereby enhancing the overall force measurement accuracy of the device. The screw has a high load-bearing capacity, is not easily deformed, moves in both directions (push and pull), and has a bidirectional self-locking function to reduce force fluctuations caused by resonance between the magnetic bearing detection device and the magnetic motor rotor.

[0021] like Figure 4 As shown, the first connecting member 3 is a connecting member with a disc-shaped connecting part at each end. The connecting disc at one end is connected to the outer ring of the turntable bearing 2, and the connecting disc at the other end is connected to the axial force sensor 4. Figure 3 , Figure 5-6 As shown, one end of the second connector is connected to the axial force sensor 4, and the other end is connected to the output terminal 7A of the axial force loading system 7, such as the lead screw flange. The number of connecting through holes is configured to match the number of through holes of the lead screw flange.

[0022] like Figure 3 As shown, the outer ring 2A of the turntable bearing 2 is fixedly connected to the axial force sensor 4. The inner ring 2B of the turntable bearing 2 is connected to the elastic element 1. The turntable bearing 2 converts the combined rotational and linear motion of the axial force loading system 7 into axial linear motion, reducing the measurement error caused by the rotation of the shaft to the axial force sensor 4. The axial force loading system 7 is set as shown in the figure. Figure 7 On the frame 6 shown, the frame 6 is welded to the base plate by vertically arranged opposing upright plates 601 and reinforcing ribs. The upright plates 601 have corresponding vertical through slots 602. The axial force loading system 7 is set on the tray 10 arranged in the horizontal direction. The two ends of the tray 10 are respectively connected to the through slots 602. The axial force loading system 7 can move up and down along the through slots 602 to adjust the position of the axial force loading system 7 in the vertical direction.

[0023] like Figure 8 As shown, the tray 10 is provided with guide rails 10A and as shown in the figure. Figure 9 The fixing member 11 shown allows the axial force loading system 7 to slide along the guide rail 10A perpendicular to the axial loading direction of the axial force loading system 7. The fixing member 11 is located at both ends of the guide rail 10A, fixing the axial force loading system 7 to the guide rail 10A. In a specific embodiment, the fixing member 11 is a micro-screw bracket. The screw passes through the threaded hole at the middle boss of the fixing member 11 and presses against the mounting base plate 801 to precisely adjust the position of the axial force loading system 7 perpendicular to the axial loading direction of the axial force loading system 7, thereby reducing the decrease in force measurement accuracy caused by misalignment in this direction.

[0024] like Figure 1 As shown, a support member 9 is also provided on the frame 6. The support member 9 is arranged along the axial loading direction of the axial force loading system 7. One end of the support member 9 abuts against the axial force loading system 7, and the other end is away from the output shaft of the axial force loading system 7 and connected to the through groove 602.

[0025] The specific measurement process is as follows: Figure 2 As shown, the magnetic levitation motor with built-in magnetic levitation bearing 001 and the magnetic levitation bearing testing device are mounted on the test platform with screws. The magnetic levitation motor achieves five-degree-of-freedom static levitation through a non-thrust side radial magnetic levitation bearing, a thrust side radial magnetic levitation bearing, and an axial magnetic levitation bearing. By adjusting the vertical height of the tray 10 and the position of the axial force loading system 7 on the tray guide rail 10A, the alignment between the axial force loading system 7 and the magnetic levitation motor shaft is adjusted, minimizing the additional axial electromagnetic force caused by misalignment. The output end of the axial force loading system 7 is connected to the output shaft of the bearing under test through the turntable bearing 2, and is used to apply axial force to the output shaft. When the axial force loading system 7 slowly and uniformly applies axial load to the motor shaft, the elastic element 1 weakens the resonance between the rotor of the magnetic levitation motor and the axial force loading system 7 caused by the dynamic electromagnetic force, thereby reducing the fluctuation of the test data of the axial force sensor 4 caused by resonance and improving the test accuracy.

[0026] The above provides a detailed description of the magnetic levitation bearing detection device provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A magnetic levitation bearing testing device, comprising a frame (6) and an axial force loading system (7), wherein the axial force loading system (7) is disposed on the frame (6); characterized in that, It also includes an axial force sensor (4) and a turntable bearing (2). The output end (7A) of the axial force loading system (7) is connected to the axial force sensor (4) and the turntable bearing (2) in sequence. The outer ring (2A) of the turntable bearing (2) is fixedly connected to the axial force sensor (4).

2. The magnetic levitation bearing detection device according to claim 1, characterized in that, It also includes an elastic element (1), one end of which is connected to the inner ring (2B) of the turntable bearing (2).

3. The magnetic levitation bearing detection device according to claim 1, characterized in that, The frame (6) includes a horizontally arranged tray (10) and a vertically arranged opposing upright plate (601); the opposing upright plate (601) is provided with a corresponding vertical through groove (602), the axial force loading system (7) is arranged on the tray (10), and the two ends of the tray (10) are respectively connected to the through groove (602).

4. The magnetic levitation bearing detection device according to claim 3, characterized in that, The tray (10) is provided with a guide rail (10A) and a fixing member (11). The guide rail (10A) is perpendicular to the axial loading direction of the axial force loading system (7). The axial force loading system (7) is slidably connected to the guide rail (10A). The fixing member (11) fixes the axial force loading system (7) to the guide rail (10A).

5. The magnetic levitation bearing detection device according to claim 3, characterized in that, The frame (6) is also provided with a support member (9), which is arranged along the axial loading direction of the axial force loading system (7). One end of the support member (9) abuts against the axial force loading system (7), and the other end is away from the output shaft of the axial force loading system (7) and connected to the through groove (602).

6. The magnetic levitation bearing detection device according to claim 1, characterized in that, The axial force loading system (7) is a trapezoidal threaded screw with a pitch of 6 mm and a stroke ratio of 24 / 1.

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