Magnetic suspension bearing detection device

Abstract

The invention provides a magnetic suspension bearing detection device, and belongs to the technical field of magnetic suspension bearing detection.The magnetic suspension bearing detection device comprises an axial force loading system arranged on a rack and further comprises an axial force sensor and a turntable bearing, the output end of the axial force loading system is sequentially connected with the axial force sensor and the turntable bearing, and the output end of the axial force loading system is connected with the turntable bearing. The outer ring of the turntable bearing is fixedly connected with the axial force sensor; the axial force loading system applies an axial force to the rotating shaft of the magnetic suspension bearing to be detected through the outer ring of the turntable bearing, and 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 suspension bearing to be detected. The influence of the axial force loading system on the radial position of the rotor and the reduction of the test precision caused by the resonance of the axial force loading system and the rotor are avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of magnetic suspension bearing detection, and particularly relates to a magnetic suspension bearing detection device. BACKGROUND

[0002] The magnetic suspension bearing comprises an axial magnetic bearing stator, a rotor, a displacement sensor and a power amplifier. When the axial force of the magnetic suspension bearing is tested, an accurate and controllable axial force is generally applied to the rotor through an axial force loading system in a force measuring device. A force sensor is connected in series between the axial force loading system and the rotor, and is used for accurately measuring the actual axial force applied to the rotor. The specific test process can refer to the Chinese patent with the publication number CN223412973U, an axial force testing device of a magnetic suspension bearing. The above-mentioned test method causes axial position fluctuation and axial force fluctuation due to the application of the axial force to the rotor, and causes additional radial torque due to axial misalignment. The resonance of the rotor and the force measuring device causes the force measuring accuracy to decrease, and the problem is particularly serious under heavy load. SUMMARY

[0003] Therefore, the purpose of the application is to provide a magnetic suspension bearing detection device, which avoids the radial position fluctuation of the rotor caused by the application of the force to the rotor, and ensures the alignment of the output end of the axial force loading system and the output shaft of the bearing, thereby improving the accuracy of the axial force test.

[0004] The magnetic suspension bearing detection device disclosed by the application comprises a rack and an axial force loading system, the axial force loading system is arranged on the rack, further comprises an axial force sensor and a turntable bearing, the output end of the axial force loading system is connected with the axial force sensor and the turntable bearing in sequence, and the outer ring of the turntable bearing is fixedly connected with the axial force sensor.

[0005] The output shaft of the magnetic suspension bearing to be detected is connected with the inner ring of the turntable bearing, the inner ring is driven to rotate to ensure the working state of the magnetic suspension bearing to be detected, the output end of the axial force loading system is connected with the outer ring of the turntable bearing, the axial force loading system applies the axial force to the rotating shaft of the magnetic suspension bearing to be detected 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 suspension bearing to be detected, and the influence of the axial force loading system on the radial position of the rotor is avoided.

[0006] Further, the device further comprises an elastic member, one end of the elastic member is connected with the inner ring of the turntable bearing. The elastic member absorbs the impact of the axial force loading system on the bearing to be detected, suppresses the resonance transmitted to the axial force sensor, and reduces the measurement error caused by the resonance.

[0007] Further, the rack comprises a tray arranged horizontally and opposite vertical plates arranged vertically, corresponding vertical through-slots are arranged on the opposite vertical plates, the axial force loading system is arranged on the tray, and the tray is connected to the through-slots at two ends, respectively.

[0008] The tray moves up and down along the through-slots on the vertical plates to adjust the height of the axial force loading system on the tray, so that the output end of the axial force loading system is kept consistent with the height of the output shaft of the bearing to be tested, and eccentricity is avoided to affect the accuracy of the axial force test.

[0009] Further, 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 in sliding connection with 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, so that the output end of the axial force loading system is aligned with the output shaft of the bearing to be tested in the horizontal direction, so that the loading force coincides with the axis of the bearing, and additional radial moments are avoided to further improve the measurement accuracy.

[0011] Further, the rack is further provided with a support member arranged along the axial loading direction of the axial force loading system, one end of the support member is in abutment with 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-slot.

[0012] By bearing the reverse axial force of the axial force loading system through the support member, the deformation of the rack under large axial force is reduced, the axial vibration of the entire measuring device is inhibited, and the fluctuation of the data collected by the axial force sensor is reduced.

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

[0014] The trapezoidal thread screw rod is driven by the rotating disc to provide a loading force to the output shaft of the bearing to be tested, the screw rod is a trapezoidal thread screw rod with a pitch of 6mm and a stroke ratio of 24 / 1, the wheel disc moves axially by 0.25mm per revolution, the screw rod can realize slow loading axial force, bidirectional movement and bidirectional self-locking, the static or quasi-static axial force provided by the axial loading system is ensured, and the measurement accuracy is reduced due to the vibration of the axial loading system.

[0015] Compared with the prior art, the present application has the following beneficial effects: The axial force loading system provided by this invention 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. This allows for accurate measurement of the actual axial force on the rotating shaft of the bearing under test. The alignment of the test end of the axial force loading system with the output shaft of the bearing under test is adjusted to avoid additional torque due to misalignment, thus reducing detection errors. Furthermore, the elastic element and the selection of an axial force loading system that allows for slow loading reduce the force fluctuations caused by resonance between the magnetic levitation bearing detection device and the motor rotor, further improving detection accuracy. Attached Figure Description

[0017] 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 invention; Figure 5 This is a perspective view of the second connector according to an embodiment of the present invention; 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 invention; Figure 8 This is a perspective view of the tray according to an embodiment of the present invention; Figure 9 This is a perspective view of the fastener according to an embodiment of the present invention.

[0018] 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

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention 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 the invention. 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 the present invention 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 invention pertains.

[0020] like Figure 1 As shown, the present invention 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 Figures 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]. Figures 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.

[0021] 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.

[0022] 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 , Figures 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] The present invention provides a detailed description of a magnetic levitation bearing detection device. Specific examples have been used to illustrate the principles and implementation methods of the invention. These embodiments are merely illustrative and are intended to help understand the core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

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 1, 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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