Axial electromagnetic bearing stiffness testing device

Abstract

The present invention discloses a device for testing the stiffness of an axial electromagnetic bearing. The device comprises a base, a sector guide block, a mounting plate, a tension sensor, and a cover plate. A thrust disc is fixedly mounted at the center of the upper surface of the base. The sector guide blocks are multiple, mounted on the base and arranged in a circular pattern around the thrust disc. A support is provided on one side of the sector guide block protruding toward the thrust disc. The mounting plate is placed above the thrust disc and supported by the support of the sector guide block. The axial magnetic bearing to be tested is fixedly mounted on the lower surface of the mounting plate. The mounting plate is vertically connected to the cover plate via the tension sensor, and the cover plate covers the multiple sector guide blocks. The device has simple component structures and is easy to install. It can accurately measure the stiffness parameters of the axial magnetic bearing.

Description

Technical Field

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

[0002] Magnetic bearings (EMBs) are a typical mechatronic product that achieves levitation through real-time dynamic control of electromagnets, generating a controlled, non-contact magnetic field. EMBs are a sustainable solution for a variety of high-speed industrial and commercial applications. Their non-contact, lubrication-free, and wear-free nature allows them to be used in vacuum systems, clean, sterile spaces, and for the transport of aggressive or high-purity media, even in high-temperature environments. Their low bearing losses, which are only 1 / 20 to 1 / 5 of those of traditional ball bearings or plain bearings, reduce operating costs. Magnetic bearings require no oil or grease during operation, making them environmentally friendly, pollution-free, and noiseless. Magnetic bearings can compensate for imbalances. Magnetic bearings can be used in extremely high-speed applications. Magnetic bearings require rotor status monitoring to operate, and this information can be used to monitor equipment health and performance, facilitating fault diagnosis. Magnetic bearings offer lower maintenance costs and longer life in harsh environments.

[0003] Axial electromagnetic bearings primarily control axial displacement through electromagnetic force. The stator of an axial electromagnetic bearing, consisting primarily of a coil and a stator core, is a typical electromagnet structure. When the stator coil is energized, the stator generates an electromagnetic force that draws the attracted surfaces closer. For a given current, the closer the distance, the greater the electromagnetic force. A displacement sensor transmits the rotor's position information in real time to a servo control system. The servo control system adjusts the current in the stator coil based on the difference between the reference signal and the sensor signal, forming a closed-loop control system that controls the axial electromagnetic bearing and keeps the rotor in its operating position.

[0004] Magnetic bearings are custom-designed for rotating equipment applications. To ensure stable system operation, they must possess appropriate stiffness. Due to errors in the processing and manufacturing processes, actual stiffness can differ from the designed value. If the stiffness of the axial magnetic bearing is not known to be within the design tolerance before the axial bearing assembly test, any subsequent failure during testing will require the axial magnetic bearing to be removed from the entire machine, which is time-consuming. Summary of the Invention

[0005] In order to solve the above problems, the present invention proposes an axial electromagnetic bearing stiffness testing device, which can accurately measure the stiffness parameters of the axial magnetic bearing before installation. The axial electromagnetic bearing stiffness testing device includes a base 1, a sector guide block 2, a mounting plate 3, a tension sensor 4, a cover plate 5, a displacement measuring block 9 and a displacement sensor 10. A thrust plate 6 is fixedly installed at the center position of the upper surface of the base 1. There are multiple sector guide blocks 2. Multiple sector guide blocks 2 are installed on the base 1 and are arranged in a circle around the thrust plate 6. The sector guide block 2 is provided with a support protruding on one side of the thrust plate 6. The mounting plate 3 is placed above the thrust plate 6 and supported by the support of the sector guide block 2. The axial magnetic bearing 7 to be tested is fixedly installed on the lower surface of the mounting plate 3. The mounting plate 3 is connected to the cover plate 5 in the vertical direction through the tension sensor 4. The cover plate 5 covers the multiple sector guide blocks 2. The displacement measuring block 9 is arranged on the upper surface of the mounting plate 3. The displacement sensor 10 is arranged on the cover plate 5 and is arranged in a straight line with the displacement measuring block 9 in the vertical direction, and its probe faces the displacement measuring block 9.

[0006] Furthermore, the testing device further includes a plurality of guide rods 8 , wherein the lower ends of the guide rods 8 are connected to the mounting plate 3 , and the upper ends of the guide rods 8 are connected to the cover plate 5 .

[0007] Furthermore, there are multiple displacement measuring blocks 9 and displacement sensors 10, which are arranged in a one-to-one correspondence.

[0008] Furthermore, the cover plate 5 of the testing device is adjusted to move up and down by means of bolts on the cover plate 5 .

[0009] Furthermore, the thrust plate 6 of the above-mentioned testing device is fixed to the base 1 by bolts.

[0010] Furthermore, the base 1 of the above-mentioned testing device is circular.

[0011] The beneficial effects of the present invention are as follows: the various parts of the measuring device described in this application have a simple structure and the entire device is easy to install. The tensile force sensor can measure the change in the magnetic tension of the axial bearing with the displacement at the same initial position, thereby calculating the stiffness parameters of the axial magnetic bearing and comparing them with the design values, thereby detecting whether the axial magnetic bearing meets the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0013] Figure 1 Schematic diagram of the structure of the axial electromagnetic bearing stiffness test device.

[0014] Figure 2 This is the structural explosion diagram of the axial electromagnetic bearing stiffness test device.

[0015] Among them, 1. base, 2. fan-shaped guide block, 3 mounting plate, 4 tension sensor, 5 cover plate, 6. thrust plate, 7. axial magnetic bearing to be measured, 8. guide rod, 9. displacement measuring block, 10. displacement sensor. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0017] like Figure 1 and Figure 2 As shown, the axial electromagnetic bearing stiffness test device includes a base 1, a fan-shaped guide block 2, a mounting plate 3, a tension sensor 4 and a cover plate 5. The thrust plate 6 is fixedly installed at the center position of the upper surface of the base 1 using bolts. The fan-shaped guide block 2 has multiple, multiple fan-shaped guide blocks 2 are installed on the base 1 and arranged in a circle around the thrust plate 6. The fan-shaped guide block 2 is provided with a support protruding toward one side of the thrust plate 6. The mounting plate 3 is placed above the thrust plate 6 and is supported by the support of the fan-shaped guide block 2. The axial magnetic bearing 7 to be tested is fixedly installed on the The lower surface of the mounting plate 3 is connected to the cover plate 5 in the vertical direction through the tension sensor 4. The cover plate 5 covers the multiple sector-shaped guide blocks 2. The testing device also includes a displacement measuring block 9 and a displacement sensor 10 for accurately measuring the precise displacement of the cover plate. The displacement measuring block 9 is arranged on the upper surface of the mounting plate 3 to provide a measuring surface for the displacement sensor 10. The displacement sensor 10 is arranged on the cover plate 5 and is arranged in a straight line with the displacement measuring block 9 in the vertical direction, and its probe is facing the displacement measuring block 9.

[0018] The testing device adjusts the bolts around the cover plate 5 to move the cover plate 5 up and down, thereby driving the mounting plate and the axial electromagnetic bearing to be tested to move, and then records the displacement S of the displacement sensor; at the same time, it reads the magnetic tension data F of the tension sensor 4, thereby knowing 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.

[0019] exist Figure 1 and Figure 2In the embodiment, the testing device further includes a plurality of guide rods 8 for ensuring that the mounting plate 3 does not tilt during movement. The lower ends of the guide rods 8 are connected to the mounting plate 3 , and the upper ends are connected to the cover plate 5 .

[0020] exist Figure 1 and Figure 2 In order to measure the displacement more accurately, there are multiple displacement measuring blocks 9 and displacement sensors 10, and they are arranged in a one-to-one correspondence.

[0021] While embodiments of the present invention have been described above, these embodiments do not exhaustively describe all details and do not limit the invention to the specific embodiments described. Numerous modifications and variations are possible based on the above description. These embodiments are selected and described in detail herein to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to utilize the present invention and its modifications and uses. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An axial electromagnetic bearing stiffness testing device, characterized in that: The testing device comprises a base (1), a sector guide block (2), a mounting plate (3), a tension sensor (4), a cover plate (5), a displacement measuring block (9) and a displacement sensor (10); a thrust plate (6) is fixedly mounted at the center of the upper surface of the base (1); a plurality of sector guide blocks (2) are mounted on the base (1) and arranged in a circular shape around the thrust plate (6); a support is provided on one side of the sector guide block (2) protruding toward the thrust plate (6); and the mounting plate (3) is placed above the thrust plate (6). The axial electromagnetic bearing (7) to be measured is supported by the support of the sector guide block (2), and is fixedly mounted on the lower surface of the mounting plate (3). The mounting plate (3) is connected to the cover plate (5) in the vertical direction through the tension sensor (4). The cover plate (5) covers a plurality of the sector guide blocks (2). The displacement measuring block (9) is arranged on the upper surface of the mounting plate (3). The displacement sensor (10) is arranged on the cover plate (5) and is arranged in a straight line with the displacement measuring block (9) in the vertical direction, and its probe faces the displacement measuring block (9).

2. The axial electromagnetic bearing stiffness testing device according to claim 1, characterized in that: It also includes a plurality of guide rods (8), wherein the lower ends of the guide rods (8) are connected to the mounting plate (3), and the upper ends are connected to the cover plate (5).

3. The axial electromagnetic bearing stiffness testing device according to claim 1, characterized in that: There are multiple displacement measurement blocks (9) and displacement sensors (10), which are arranged in a one-to-one correspondence.

4. The axial electromagnetic bearing stiffness testing device according to claim 1, characterized in that: The cover plate (5) is adjusted to move up and down by means of bolts on the cover plate.

5. The axial electromagnetic bearing stiffness testing device according to any one of claims 1 to 4, characterized in that: The thrust plate (6) is fixed to the base (1) by means of bolts.

6. The axial electromagnetic bearing stiffness testing device according to any one of claims 1 to 4, characterized in that: The base (1) is circular.

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