Axial electromagnetic bearing stiffness testing device

Abstract

The present invention discloses an axial electromagnetic bearing stiffness test device, including a support box, a lifting mechanism for lifting the electromagnetic bearing to be tested is arranged above the support box, the lifting mechanism includes a lift installed on the top of the support box, the side of the lift is connected through a speed change plate, a power supply is installed below the speed change plate, used to energize the conductive rope, and a support block is arranged on one side of the power supply, used to support the conductive rope. An observation plate for detecting the electromagnetic bearing to be tested is installed below the support block, the current stiffness is calculated according to the data measured by the force sensor, the slider slides inside the drag platform, so as to obtain the current stiffness at different positions, to ensure the accuracy and reliability of the data, and then during the sliding process, the support airbag at the bottom of the drag platform can provide support at a specific position, and the displacement stiffness is measured by observing the force sensor, so as to record the displacement stiffness at different positions, and increase the persuasiveness of the test data through multiple sets of data.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension bearings, and in particular to a device for testing the stiffness of an axial electromagnetic bearing. Background Art

[0002] Electromagnetic bearings are a typical mechatronics product that generates controlled non-contact magnetic field forces through real-time control of electromagnets to achieve the suspension of objects. Electromagnetic bearings are a sustainable solution for various industrial and commercial high-speed applications. Electromagnetic bearings have the following characteristics: no contact, no lubrication, and no wear, which enables them to be used in vacuum systems, clean and sterile spaces, and in the transmission of corrosive or high-purity media. They even perform well in high-temperature environments. Compared with traditional ball bearings or sliding bearings, their bearing losses are only 1 / 20 to 1 / 5, making them easier to diagnose faults. Magnetic bearings have lower maintenance costs and longer life in harsh environments.

[0003] Electromagnetic bearings are non-standard designs based on the occasions where rotating equipment is used. To ensure stable operation of the system, electromagnetic bearings must have appropriate stiffness. Due to errors in the processing and manufacturing process, there will be differences between the actual stiffness and the design value. If it is found to be unqualified during the subsequent test, the axial electromagnetic bearing needs to be removed from the entire machine, which will take a lot of time.

[0004] After searching for the invention patent with patent number CN116499662A, an axial electromagnetic bearing stiffness test device is disclosed, which includes a base, a fan-shaped guide block, a mounting plate, a tension sensor and a cover plate. A thrust plate is fixedly installed at the center position of the upper surface of the base. There are multiple fan-shaped guide blocks, and multiple fan-shaped guide blocks are installed on the base and arranged in a circle around the thrust plate. The fan-shaped guide block is provided with a support protruding toward one side of the thrust plate. The mounting plate is placed above the thrust plate and supported by the support of the fan-shaped guide block. The axial magnetic bearing to be tested is fixedly installed on the lower surface of the mounting plate. The mounting plate is connected to the cover plate in the vertical direction through the tension sensor, and the cover plate covers the multiple fan-shaped guide blocks.

[0005] Compared with the prior art, the invention patent with patent number CN116499662A records the displacement S of the displacement sensor; at the same time, it reads the magnetic tension data F of the tension sensor 4, so as to know the magnetic force generated by the axial magnetic bearing at different distances, and then accurately calculates the displacement stiffness of the axial magnetic bearing through the displacement stiffness K=F / S. The parts of the test device are simple in structure and the entire device is easy to install, and the stiffness parameters of the axial magnetic bearing can be accurately measured.

[0006] However, the above scheme relies on displacement sensors and tension sensors to measure the stiffness of magnetic bearings, but it cannot be accurately achieved when testing electromagnetic bearings of different sizes. In addition, a fixture is required to keep the bearing level during the test, which may lead to inaccurate electromagnetic force and thus affect the reliability of the test results. Therefore, it is necessary to propose an improved axial electromagnetic bearing stiffness test device. Summary of the invention

[0007] The purpose of the present invention is to solve the many deficiencies in the electromagnetic bearing stiffness test in the prior art, including the difficulty in adapting to the test requirements of electromagnetic bearings of different sizes, the error problems that may occur during the test, and the high cost of using the test device, the large number of parts, and the situation that the entire device may not work due to the damage of a single component. In addition, the actual situation that first-time users may need to learn additional operating skills is fully taken into account. Therefore, the present invention proposes an improved axial electromagnetic bearing stiffness test device, which aims to comprehensively optimize the above problems.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] An axial electromagnetic bearing stiffness test device comprises a support box, a lifting mechanism for lifting the electromagnetic bearing to be tested is arranged above the support box, the lifting structure comprises a lifter at the top of the support box, a speed change plate is rotatably connected to the side of the lifter, a power supply for passing current to a conductive rope is arranged below the speed change plate, a support block for supporting the conductive rope is arranged on one side of the power supply, and an observation plate for detecting the electromagnetic bearing to be tested is arranged below the support block;

[0010] The cam is provided with a second adjusting frame on both sides of the observation plate, the second adjusting frame is slidably connected to the first adjusting frame, the bottom of the first adjusting frame is fixedly connected to a slider, the top of the slider is fixedly connected to a rotator, the top of the rotator is rotatably connected to a shell, and the top of the shell is provided with a clamping structure for clamping the clamping plate, the clamping structure includes a clamping claw at the bottom of the clamping plate, and the clamping plate can be respectively fixed to the three tops of the clamping claw, the side of the clamping claw is rotatably connected to the second rotating block and the first rotating block, one end of the second rotating block is rotatably connected to a sliding hollow column, one end of the first rotating block is slidably connected to a sliding hollow column, a circular shaft is slidably connected inside the sliding hollow column, a push plate is provided on the outside of the circular shaft, a thread is provided inside the shell, and the bottom of the conductive rope is provided with an adjustable adsorbent to adapt to electromagnetic bearings of different sizes, three groups of second rotating blocks and the first rotating blocks are fixed on the side wall of the sliding hollow column, and the side of the hollow column is slidably connected to the shell to ensure stable and precise operation of the device.

[0011] The above technical solution further includes:

[0012] A rotating shaft for supporting the winding of the conductive rope is arranged inside the support block, and a displacement sensor is arranged at the bottom of the conductive rope. Different data are obtained according to the displacement stiffness formula KS=FS / S to calculate the specific value of the displacement stiffness, and the force sensor calculates the current stiffness of the force sensor according to the formula KI=FI / I. Through the two sets of formulas, accurate calculation values ​​can be calculated to the greatest extent to obtain convincing data.

[0013] The current of different current magnitudes can be adjusted inside the power supply, and the rotator is fixedly connected to the bottom of the slider.

[0014] The bottom of the sliding block is slidably connected with a drag platform, and the drag platform is fixedly connected to the force sensor.

[0015] The power supply is fixed above the supporting box, and a conductor for supplying current to the conductive rope is arranged on one side of the power supply.

[0016] A base for holding the electromagnetic bearing to be tested is arranged at the bottom of the clamping plate, and a lifting frame is fixedly connected above the supporting box.

[0017] A displacement sensor for measuring the lifting of the observation plate is arranged on one side of the dragging platform, and the data measurement of the displacement sensor is not affected when the axial electromagnetic bearing is energized.

[0018] The present invention has the following beneficial effects:

[0019] In the present invention, the current stiffness is obtained according to the data measured by the force sensor, the slider slides inside the tow table to obtain the current stiffness at different positions, and then accurate and reliable data is obtained, and the accuracy of data measurement is increased by setting a supporting object to keep it at a certain height. When sliding, there is a supporting airbag at the bottom of the tow table to support it when it slides to a certain position, and the displacement stiffness is observed by observing the force sensor, and the displacement stiffness at different positions is recorded, and the persuasiveness of the test data is increased by multiple groups of data.

[0020] When using the observation plate, the telescopic lengths of the first adjustment frame and the second adjustment frame can be changed to well adjust the results obtained when measuring electromagnetic bearings of different sizes to be tested, thereby reducing the waste of resources of the axial electromagnetic bearing stiffness testing device. When determining a certain current, the data that can be obtained at a slower displacement speed can be adjusted to be more accurate. When clamping the electromagnetic bearing to be tested, the data can be measured while maintaining a horizontal state to ensure that the errors in the experiment are minimized.

[0021] In the present invention, the design of the internal thread of the casing can conveniently control the height of the experimental device, ensuring that data with small errors are obtained. The adsorbent is arranged under the conductive rope, which can maintain the vertical direction of the electromagnetic force during the electromagnetic bearing test and reduce the experimental error. In addition, the displacement sensor under the dragging platform can accurately detect the lifting position of the observation plate to ensure the accuracy of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of an axial electromagnetic bearing stiffness testing device proposed by the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the first part of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the second part of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the third part of the present invention;

[0026] Figure 5 It is a schematic structural diagram of the fourth part of the present invention;

[0027] Figure 6 It is a schematic structural diagram of the fifth part of the present invention.

[0028] In the figure: 1, power supply; 2, lift; 3, speed change plate; 4, conductive rope; 5, support block; 6, lifting frame; 7, clamping plate; 8, first adjustment frame; 9, second adjustment frame; 10, drag platform; 11, clamping claw; 12, first rotating block; 13, second rotating block; 14, round shaft; 15, push plate; 16, rotator; 17, housing; 18, slider; 19, force sensor; 20, casing; 21, support box; 22, electromagnetic bearing to be tested; 23, observation plate; 24, sliding hollow column; 25, displacement sensor. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to provide a detailed and complete description of the technical solutions in the embodiments of the present invention. Please note that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments shown in the present invention, all other embodiments that can be thought of or realized by ordinary technicians in this field without creative work are deemed to be within the scope of protection of the present invention. Example

[0030] like Figures 1 to 6As shown, the present invention provides an axial electromagnetic bearing stiffness test device. The device includes a support box 21, on which a lifting mechanism is installed to control the lifting of the electromagnetic bearing 22 to be tested. The lifting mechanism includes an elevator 2 installed on the top of the support box 21. A speed change disk 3 is connected to the side of the elevator 2, and a conductive rope 4 is installed below the speed change disk 3, and it is energized by a power supply 1. A support block 5 is provided on one side of the power supply 1 for supporting the conductive rope 4. An observation plate 23 is provided below the support block 5 to detect the state of the electromagnetic bearing 22 to be tested.

[0031] The second adjustment frame 9 is provided on both sides of the observation plate 23, and the second adjustment frame 9 is slidably connected to the first adjustment frame 8. The bottom of the first adjustment frame 8 is fixedly connected to a slider 18, and the top of the slider 18 is fixedly connected to a rotator 16, and the top of the rotator 16 is rotatably connected to a housing 20, and a clamping structure for clamping the clamping plate 7 is provided above the housing 20, and the clamping structure includes a clamping claw 11 at the bottom of the clamping plate 7, and the clamping plate 7 can be fixed on the three top ends of the clamping claw 11 respectively. The side of the clamping claw 11 is rotatably connected to the first rotating block 12 through the second rotating block 13. One end of the second rotating block 13 is connected to a sliding hollow column 24, and one end of the first rotating block 12 is slidably connected to a sliding hollow column 24, and a round shaft 14 is installed in the sliding hollow column 24, and a push plate 15 is sleeved on the outside of the round shaft 14, and a thread is provided inside the housing 20 to facilitate the height adjustment of the device.

[0032] The working principle of the axial electromagnetic bearing stiffness test device of the present invention is as follows: when testing the stiffness of the electromagnetic bearing, first adjust the height of the speed change disc 3 through the elevator 2 to ensure that the sensor can detect the up and down movement distance of the bearing. Then, the electromagnetic bearing 22 to be tested is placed in the clamping plate 7. The round shaft 14 is driven to rotate by rotating the slider 18, so that the first rotating block 12 moves, so that the three groups of clamping claws 11 on the side of the housing 17 are unfolded, so as to fix the electromagnetic bearing 22 to be tested on the base of the clamping plate 7. Since the electromagnetic bearing 22 to be tested is suspended at the bottom of the conductive rope 4, it can be kept in a horizontal state. Then, the power supply 1 energizes the electromagnetic bearing 22 to be tested, and different current amounts will cause different electromagnetic forces, thereby causing the observation plate 23 to rise or fall under the action of the electromagnetic bearing. According to the data measured by the force sensor 19, the current stiffness can be obtained. The slider 18 slides in the drag platform 10 to record the current stiffness at different positions. In this process, the support airbag provides support for the drag platform 10 to ensure the stability of the measurement. Subsequently, by adjusting the moving speed of the conductive rope 4, more accurate data can be obtained, thereby reducing experimental errors and improving the reliability of the data. Example

[0033] like Figures 1 to 6 As shown, based on Example 1,

[0034] The bottom of the conductive rope 4 is provided with an adsorbent for adjusting different electromagnetic bearings. The side wall of the sliding hollow column 24 is fixed with three sets of second rotating blocks 13 and first rotating blocks 12. The side of the sliding hollow column 24 is slidably connected with a shell 17.

[0035] A rotating shaft for supporting the winding of the conductive rope 4 is arranged inside the supporting block 5 , and a displacement sensor 25 is arranged at the bottom of the conductive rope 4 .

[0036] The current of different current magnitudes can be adjusted inside the power supply 1 , and the rotator 16 is fixedly connected to the bottom of the slider 18 .

[0037] The bottom of the slider 18 is slidably connected to a drag platform 10 , and the drag platform 10 is fixedly connected to a force sensor 19 .

[0038] The power supply 1 is fixed above the support box 21 , and a conductor for passing current into the conductive rope 4 is arranged on one side of the power supply 1 .

[0039] A base for holding the electromagnetic bearing 22 to be tested is arranged at the bottom of the clamping plate 7 , and a lifting frame 6 is fixedly connected above the supporting box 21 .

[0040] A displacement sensor 25 for measuring the lifting and lowering of the observation plate 23 is provided on one side of the carriage 10 .

[0041] The working principle of the axial electromagnetic bearing stiffness test device of the present invention is as follows: a thread is provided inside the casing 20, so as to control the height of the experimental device at different positions, thereby reducing experimental errors and improving the accuracy of the data. When the slider 18 slides inside the traction platform 10, the clamping claws 11 can be dispersed to clamp axial electromagnetic bearings of different sizes to be tested, and adjust their heights to ensure the stable operation of the device. An adsorbent is provided below the conductive rope 4 to keep the power on during the electromagnetic bearing test, to ensure that the electromagnetic force generated by the electromagnetic bearing acts vertically, to reduce experimental errors, and to enhance the persuasiveness of the data. In addition, the displacement sensor 25 provided below the traction platform 10 can accurately detect the lifting position of the observation plate 23 to ensure the accuracy of the data.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An axial electromagnetic bearing stiffness testing device, comprising a support box (21), characterized in that: A lifting mechanism for lifting the electromagnetic bearing (22) to be tested is arranged above the support box (21), the lifting mechanism comprising a lifter (2) at the top of the support box (21), a speed change disc (3) being rotatably connected to the side of the lifter (2), a power supply (1) for supplying current to the conductive rope (4) being arranged below the speed change disc (3), a support block (5) for supporting the conductive rope (4) being arranged on one side of the power supply (1), and an observation plate (23) for detecting the electromagnetic bearing (22) to be tested being arranged below the support block (5); Second adjustment frames (9) are provided on both sides of the observation plate (23), the second adjustment frames (9) are slidably connected to the first adjustment frames (8), a slider (18) is fixedly connected to the bottom of the first adjustment frame (8), a rotator (16) is fixedly connected above the slider (18), a sleeve (20) is rotatably connected above the rotator (16), a clamping structure for clamping the clamping plate (7) is provided above the sleeve (20), the clamping structure comprises a clamping claw (11) at the bottom of the clamping plate (7), the clamping plate ( 7) can be respectively fixed on the three top parts of the clamping claw (11), the side of the clamping claw (11) is rotatably connected to the second rotating block (13) and the first rotating block (12), one end of the second rotating block (13) is rotatably connected to a sliding hollow column (24), one end of the first rotating block (12) is rotatably connected to a sliding hollow column (24), the sliding hollow column (24) is slidably connected to a round shaft (14) inside, a push plate (15) is fixedly connected above the round shaft (14), and a thread is arranged inside the sleeve (20).

2. The axial electromagnetic bearing stiffness testing device according to claim 1, characterized in that: An adsorbent for adjusting different electromagnetic bearings is arranged at the bottom of the conductive rope (4), three groups of second rotating blocks (13) and first rotating blocks (12) are fixed to the side wall of the sliding hollow column (24), and a housing (17) is slidably connected to the side of the sliding hollow column (24).

3. The axial electromagnetic bearing stiffness testing device according to claim 1, characterized in that: A rotating shaft for supporting the winding of the conductive rope (4) is arranged inside the support block (5), and a displacement sensor (25) is arranged at the bottom of the conductive rope (4).

4. The axial electromagnetic bearing stiffness testing device according to claim 1, characterized in that: The current of different current magnitudes can be adjusted inside the power supply (1), and the rotator (16) is fixedly connected to the bottom of the slider (18).

5. The axial electromagnetic bearing stiffness testing device according to claim 1, characterized in that: The bottom of the sliding block (18) is slidably connected to a drag platform (10), and the drag platform (10) is fixedly connected to a force sensor (19).

6. The axial electromagnetic bearing stiffness testing device according to claim 1, characterized in that: The power supply (1) is fixed above the support box (21), and a conductor for passing current into the conductive rope (4) is provided on one side of the power supply (1).

7. The axial electromagnetic bearing stiffness testing device according to claim 1, characterized in that: A base for holding the electromagnetic bearing (22) to be tested is provided at the bottom of the clamping plate (7), and a lifting frame (6) is fixedly connected above the supporting box (21).

8. The axial electromagnetic bearing stiffness testing device according to claim 5, characterized in that: A displacement sensor (25) for measuring the lifting and lowering of the observation plate (23) is provided on one side of the dragging platform (10).

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