Magnetic bearing testing device

Abstract

The invention discloses a magnetic bearing testing device, which relates to the technical field of magnetic bearing testing, has the advantage of reducing the influence of a rotating shaft of a motor on the stability test of a rotor in a magnetic bearing, and is characterized in that the magnetic bearing testing device comprises a fixed plate and two first vertical columns arranged on the fixed plate, and a mounting plate is arranged between the two first vertical columns; a mounting groove used for mounting a magnetic bearing is formed in one side of the mounting plate, two opposite second stand columns are arranged on the fixing plate, a suspension plate is arranged between the two second stand columns, a rotating groove is formed in the side, close to the mounting plate, of the suspension plate, a rotating shaft is rotationally connected into the rotating groove, and a motor used for driving the rotating shaft to rotate is arranged on the fixing plate through a fixing frame. A sleeve barrel is arranged on the side, close to the mounting plate, of the rotating shaft through a transmission part, a driving shaft is coaxially mounted on the sleeve barrel, and the end, away from the sleeve barrel, of the driving shaft penetrates through a rotor of the magnetic bearing and is connected with the rotor.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic bearing testing, in particular to a magnetic bearing testing device. Background Art

[0002] Magnetic bearings use electromagnetic force to suspend the rotor directly in space. They have many advantages such as no friction, long life, low energy consumption, and low noise. They are particularly suitable for special environments such as high speed, vacuum, and ultra-clean. They can be widely used in mechanical processing, turbo machinery, aerospace, vacuum technology, rotor dynamics characteristics identification and testing, and other fields. Magnetic bearings 4 are a type of bearing with no mechanical contact between the rotor 14 and the stator 28 (such as Fig. 9 ).

[0003] The magnetic bearing needs to drive the rotor suspended in the magnetic bearing to rotate through the rotating shaft of the motor. During the rotation process, the stability of the rotating rotor is tested, that is, the left and right and up and down displacement of the rotor in the stator is tested. Since the rotor is installed on the rotating shaft of the motor, the rotating shaft of the motor will affect the stability test of the rotor. Therefore, the applicant has developed a new technical solution in the actual production process to solve the above technical problems. Summary of the invention

[0004] In view of the above-mentioned technical deficiencies, an object of the present invention is to provide a magnetic bearing testing device, which has the advantage of reducing the influence of the rotating shaft of the motor on the rotor stability test in the magnetic bearing.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a magnetic bearing testing device, comprising a fixed plate and two first columns arranged at the top end of the fixed plate, a mounting plate is arranged between the two first columns, and a mounting groove for mounting the magnetic bearing is opened on one side of the mounting plate, two opposite second columns are arranged at the top end of the fixed plate, and a hanging plate is arranged between the two second columns, the hanging plate is opposite to the mounting plate front and back, and a rotating groove is opened on the side of the hanging plate close to the mounting plate, and a rotating shaft is rotatably connected in the rotating groove, a motor for driving the rotating shaft to rotate is arranged on the fixed plate through a fixed frame, a sleeve barrel is arranged on the side of the rotating shaft close to the mounting plate through a transmission member, and a driving shaft is coaxially installed on the sleeve barrel, an end of the driving shaft away from the sleeve barrel passes through the rotor of the magnetic bearing and is connected to the rotor, and two first eddy current displacement sensors located above and on the right side of the driving shaft are arranged on the side of the mounting plate away from the hanging plate through a mounting frame, and the two first eddy current displacement sensors are respectively used to detect the left and right and up and down displacements of the driving shaft, respectively.

[0006] By adopting the above technical solution, the rotating shaft of the motor drives the rotating shaft to rotate, the rotating shaft drives the barrel to rotate through the transmission member, the barrel drives the driving shaft, and the driving shaft drives the rotor in the magnetic bearing to rotate. During the rotation of the rotor, the left and right and up and down displacements of the driving shaft are respectively detected by two first eddy current displacement sensors, so that the up and down, left and right displacements of the rotor in the magnetic bearing can be detected. The transmission member can reduce the occurrence of the situation where the rotating shaft of the motor affects the rotor stability test. The driving shaft is key-connected to the rotor in the magnetic bearing, which is simple and convenient to use.

[0007] Preferably, the transmission member includes a first shaft, a second shaft and a rectangular block, the first shaft and the second shaft are opposite to each other front to back, and two first connecting plates are provided on the side of the first shaft close to the second shaft, and the two first connecting plates are opposite to each other left to right, and two second connecting plates are provided on the side of the second shaft close to the first shaft, and the two second connecting plates are opposite to each other up and down, the rectangular block is located between the two first connecting plates, and the left and right sides of the rectangular block are rotatably connected to the first connecting plates, and the upper and lower ends of the rectangular block are rotatably connected to the second connecting plates, the second shaft is set on the rotating shaft, and the barrel is set on the side of the first shaft away from the second shaft.

[0008] Preferably, a rectangular groove is provided on the side of the first shaft body facing away from the second shaft body, and a sliding rod is horizontally inserted in the rectangular groove, the sliding rod extends outside the rectangular groove on the side facing away from the bottom of the rectangular groove, the barrel is arranged at one end of the sliding rod extending outside the rectangular groove, and a second eddy current displacement sensor for detecting the forward and backward displacement of the drive shaft is provided on the fixed plate through a first sliding member.

[0009] Preferably, the first sliding member includes a slide rail arranged on the top of the fixed plate, and an inverted T-shaped slide plate is horizontally slidably connected to the slide rail, and the second eddy current displacement sensor is installed on the slide plate and corresponds to the side of the drive shaft away from the barrel.

[0010] Preferably, a plurality of threaded holes are provided on the groove wall of the mounting groove, and a first bolt is threadedly connected in each threaded hole, and one end of each first bolt close to the magnetic bearing is tightly pressed against the outer wall of the stator in the magnetic bearing. There are four first bolts, and the four first bolts are evenly distributed along the circumference of the mounting groove.

[0011] Preferably, the two first columns are threaded rods, the top of the mounting plate is provided with two opposite through holes, the tops of the two first columns pass through the two through holes respectively, and two nuts are threadedly connected to the two first columns, and the two nuts are respectively located at the upper and lower ends of the mounting plate and both are in conflict with the mounting plate.

[0012] Preferably, the transmission member includes a cylinder and two transmission rods arranged on the outer wall of the barrel, the two transmission rods are opposite to each other up and down, the cylinder is coaxially arranged on the rotating shaft, and two circular rings are arranged on the cylinder through the side plate, the two circular rings are opposite to each other up and down, and the two transmission rods are provided with transmission columns on the side close to the circular rings, and the ends of the two transmission columns away from the transmission rods pass through the two circular rings coaxially respectively, the diameter of the transmission column is smaller than the inner diameter of the circular ring, and there is a gap between the inner wall of the circular ring and the transmission column.

[0013] Preferably, a third eddy current displacement sensor for detecting the front-rear displacement of the drive shaft is provided on the fixed plate via a second sliding member.

[0014] Preferably, the second sliding member includes a slideway arranged on the top of the fixed plate, and an inverted T-shaped slide seat is horizontally slidably connected to the slideway, and the third eddy current displacement sensor is installed on the slide seat and corresponds to the side of the drive shaft away from the barrel.

[0015] Preferably, the inner wall surfaces of the two circular rings are both arc-shaped surfaces.

[0016] The beneficial effects of the present invention are as follows: the rotating shaft of the motor drives the rotating shaft to rotate, the rotating shaft drives the barrel to rotate through the transmission member, the barrel drives the driving shaft, and the driving shaft drives the rotor in the magnetic bearing to rotate. During the rotation of the rotor, the left and right and up and down displacements of the driving shaft are respectively detected by two first eddy current displacement sensors, so that the up and down, left and right displacements of the rotor in the magnetic bearing can be detected. The transmission member can reduce the occurrence of the situation where the rotating shaft of the motor affects the rotor stability test. The driving shaft is key-connected to the rotor in the magnetic bearing, which is simple and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of this embodiment; Figure 2 This is a schematic diagram of the structure of the mounting plate of this embodiment; Figure 3 This is a schematic diagram of the structure of the barrel in this embodiment; Figure 4 This is a schematic diagram of the structure of the rectangular groove in this embodiment; Figure 5 It is a schematic diagram of the position distribution of four threaded holes; Figure 6 This is a schematic diagram of the structure of the column in this embodiment; Figure 7 This is a schematic diagram of the structure of the transmission column of this embodiment; Figure 8 It is a schematic diagram of the structure of the arc surface inside the ring; Fig. 9 Schematic diagram of the structure of the magnetic bearing.

[0019] Description of reference numerals: In the figure: 1, fixed plate; 2, first column; 3, mounting plate; 4, magnetic bearing; 5, mounting groove; 6, second column; 7, hanging plate; 8, rotating groove; 9, rotating shaft; 10, motor; 12, barrel; 13, driving shaft; 14, rotor; 15, first eddy current displacement sensor; 16, first shaft; 17, second shaft; 18, rectangular block; 19, first connecting plate; 20, second connecting plate; 21, rectangular groove; 22, sliding rod; 23, second eddy current displacement sensor; 24, slide rail; 25, slide plate; 26, threaded hole; 27, first bolt; 28, stator; 29, through hole; 30, nut; 31, column; 32, transmission rod; 33, side plate; 34, ring; 35, transmission column; 36, third eddy current displacement sensor; 37, slideway; 38, slide seat; 39, arc surface. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] A magnetic bearing testing device, such as Figure 1 and Figure 2, including a fixed plate 1 and two first columns 2 arranged at the top of the fixed plate 1, a mounting plate 3 is arranged between the two first columns 2, and a mounting groove 5 for mounting a magnetic bearing 4 is opened on one side of the mounting plate 3, two opposite second columns 6 are arranged at the top of the fixed plate 1, and a hanging plate 7 is arranged between the two second columns 6, the hanging plate 7 is opposite to the mounting plate 3 front and back, and a rotating groove 8 is opened on the side of the hanging plate 7 close to the mounting plate 3, and a rotating shaft 9 is rotatably connected in the rotating groove 8, a motor 10 for driving the rotating shaft 9 to rotate is arranged on the fixed plate 1 through a fixed frame, a sleeve barrel 12 is arranged on the side of the rotating shaft 9 close to the mounting plate 3 through a transmission member, and a driving shaft 13 is coaxially installed on the sleeve barrel 12, and the end of the driving shaft 13 away from the sleeve barrel 12 passes through the rotor 14 of the magnetic bearing 4 and is connected to the rotor 14, and two first eddy current displacement sensors 15 located above and on the right side of the driving shaft 13 are respectively arranged on the side of the mounting plate 3 away from the hanging plate 7, and the two first eddy current displacement sensors 15 are respectively used to detect the left and right and up and down displacements of the driving shaft 13.

[0022] like Figure 1 and Figure 2 The rotating shaft of the motor 10 drives the rotating shaft 9 to rotate, the rotating shaft 9 drives the sleeve barrel 12 to rotate through the transmission member, the sleeve barrel 12 drives the driving shaft 13, and the driving shaft 13 drives the rotor 14 in the magnetic bearing 4 to rotate. During the rotation of the rotor 14, the left and right and up and down displacements of the driving shaft 13 are respectively detected by two first eddy current displacement sensors 15, so that the up and down, left and right displacements of the rotor 14 in the magnetic bearing 4 can be detected. The transmission member can reduce the situation where the rotating shaft 9 and the rotating shaft of the motor 10 affect the stability test of the rotor 14. The driving shaft 13 is key-connected to the rotor 14 in the magnetic bearing 4, which is simple and convenient to use.

[0023] like Figure 1 and Figure 2 The transmission member includes a first shaft body 16, a second shaft body 17 and a rectangular block 18. The first shaft body 16 and the second shaft body 17 are opposite to each other front and back, and two first connecting plates 19 are provided on the side of the first shaft body 16 close to the second shaft body 17, and the two first connecting plates 19 are opposite to each other left and right. Two second connecting plates 20 are provided on the side of the second shaft body 17 close to the first shaft body 16, and the two second connecting plates 20 are opposite to each other up and down. The rectangular block 18 is located between the two first connecting plates 19, and the left and right sides of the rectangular block 18 are rotatably connected to the first connecting plate 19, and the upper and lower ends of the rectangular block 18 are rotatably connected to the second connecting plate 20. The second shaft body 17 is set on the rotating shaft 9, and the barrel 12 is set on the side of the first shaft body 16 away from the second shaft body 17.

[0024] like Figure 1 and Figure 2When the rotating shaft of the motor 10 drives the rotating shaft 9 to rotate, the rotating shaft 9 will drive the second shaft body 17 to rotate, and the second shaft body 17 drives the second connecting plate 20 to rotate along the rotating axis of the second shaft body 17. At this time, because the upper and lower ends of the rectangular block 18 are rotatably connected with the second connecting plate 20, when the second shaft body 17 rotates, the rectangular block 18 will rotate with the second shaft body 17 through the second connecting plate 20. At this time, the rectangular block 18 will drive the first shaft body 16 to rotate synchronously with the second shaft body 17 through the first connecting plate 19. At this time, the first shaft body 16 will drive the sleeve barrel 1 2 rotates, the sleeve barrel 12 drives the driving shaft 13 to rotate, because the upper and lower ends of the rectangular block 18 are both rotatably connected to the second connecting plate 20, and the left and right sides of the rectangular block 18 are both rotatably connected to the first connecting plate 19, so when the driving shaft 13 drives the rotor 14 in the magnetic bearing 4 to rotate in the stator 28, through the cooperation of the second shaft body 17, the first shaft body 16, the first connecting plate 19, the second connecting plate 20 and the rectangular block 18, the situation that the rotating shaft 9 affects the up and down and left and right displacement of the driving shaft 13 when the rotating shaft of the motor 10 drives the rotating shaft 9 to rotate can be reduced, and the use is simple and convenient.

[0025] like Figure 3 and Figure 4 A rectangular groove 21 is provided on the side of the first shaft body 16 away from the second shaft body 17, and a slide bar 22 is horizontally inserted in the rectangular groove 21, and the slide bar 22 extends from the side of the bottom of the rectangular groove 21 to the outside of the rectangular groove 21, and the barrel 12 is arranged at the end of the slide bar 22 extending outside the rectangular groove 21, and a second eddy current displacement sensor 23 for detecting the front and rear displacement of the driving shaft 13 is provided on the fixed plate 1 through a first sliding member, and the first sliding member includes a slide rail 24 arranged at the top of the fixed plate 1, and an inverted T-shaped slide plate 25 is horizontally slidably connected to the slide rail 24, and the second eddy current displacement sensor 23 is installed on the slide plate 25 and corresponds to the side of the driving shaft 13 away from the barrel 12. The purpose of this arrangement is to When the shaft 13 drives the rotor 14 in the magnetic bearing 4 to rotate in the stator 28, the slide plate 25 is pushed to slide on the slide rail 24 along the length direction of the slide rail 24. At this time, the second eddy current displacement sensor 23 will follow the slide plate 25 until the second eddy current displacement sensor 23 is moved to the side of the drive shaft 13 away from the barrel 12. At this time, the front and rear displacement of the drive shaft 13 is detected by the second eddy current displacement sensor 23, so that the front and rear displacement of the rotor 14 in the magnetic bearing 4 in the stator 28 can be detected. When the drive shaft 13 moves forward and backward, the slide bar 22 will slide in or out of the rectangular groove 21, and the end of the slide bar 22 close to the bottom of the rectangular groove 21 is always located in the rectangular groove 21, which is simple and convenient to use.

[0026] like Figure 1 and Figure 5A plurality of threaded holes 26 are provided on the groove wall of the mounting groove 5, and each threaded hole 26 is threadedly connected with a first bolt 27, and one end of each first bolt 27 close to the magnetic bearing 4 is tightly pressed against the outer wall of the stator 28 in the magnetic bearing 4. There are four first bolts 27, and the four first bolts 27 are evenly distributed along the circumference of the mounting groove 5. The purpose of this setting is that the magnetic bearing 4 can be installed in the mounting groove 5 by matching the first bolts 27 with the threaded holes 26. When disassembling, it is only necessary to loosen the first bolt 27, then remove the barrel 12 from the drive shaft 13, and then take the magnetic bearing 4 out of the mounting groove 5, and the disassembly and assembly are simple.

[0027] like Figure 1 and Figure 5 The two first columns 2 are both threaded rods, and two opposite through holes 29 are provided at the top of the mounting plate 3. The tops of the two first columns 2 pass through the two through holes 29 respectively, and two nuts 30 are threadedly connected to the two first columns 2, and the two nuts 30 are respectively located at the upper and lower ends of the mounting plate 3 and are in conflict with the mounting plate 3. The purpose of this arrangement is that by rotating the two nuts 30 on the first column 2, the height position of the mounting plate 3 on the first column 2 can be adjusted, thereby facilitating the installation of the drive shaft 13 and the barrel 12 after one end of the drive shaft 13 passes through the rotor 14 of the magnetic bearing 4.

[0028] like Figure 6 and Figure 7 Alternatively, the transmission member includes a column 31 and two transmission rods 32 arranged on the outer wall of the barrel 12, the two transmission rods 32 are opposite to each other up and down, the column 31 is coaxially arranged on the rotating shaft 9, and two circular rings 34 are arranged on the column 31 through the side plate 33, the two circular rings 34 are opposite to each other up and down, and the two transmission rods 32 are close to the circular rings 34. The sides are provided with transmission columns 35, and the ends of the two transmission columns 35 away from the transmission rods 32 pass through the two circular rings 34 coaxially, the diameter of the transmission column 35 is smaller than the inner diameter of the circular ring 34, and there is a gap between the inner wall of the circular ring 34 and the transmission column 35.

[0029] like Figure 6 and Figure 7When the shaft 9 rotates, the shaft 9 will drive the column 31 to rotate, and the column 31 will drive the two rings 34 to rotate along the axis of the column 31 through the side plates 33. As the rings 34 rotate, the inner walls of the rings 34 contact the transmission posts 35 on the transmission rods 32. At this time, the rings 34 will drive the transmission rods 32 to rotate along the axis of the barrel 12 through the transmission posts 35. At this time, the transmission rods 32 will drive the barrel 12 to rotate, and the barrel 12 will drive the drive shaft 13 to rotate. Because the diameter of the transmission posts 35 is smaller than the inner diameter of the rings 34, and there is a gap between the inner wall of the rings 34 and the transmission posts 35, when the drive shaft 13 drives the rotor 14 in the magnetic bearing 4 to rotate in the stator 28, the cooperation between the transmission rods 32, the transmission posts 35, the rings 34, the side plates 33 and the column 31 can reduce the occurrence of the shaft 9 affecting the up, down, left and right displacement of the drive shaft 13 when the shaft 9 rotates.

[0030] like Figure 6 The fixed plate 1 is provided with a third eddy current displacement sensor 36 for detecting the front and rear displacement of the drive shaft 13 through a second sliding member. The second sliding member includes a slideway 37 arranged at the top of the fixed plate 1, and an inverted T-shaped slide seat 38 is horizontally slidably connected to the slideway 37. The third eddy current displacement sensor 36 is installed on the slide seat 38 and corresponds to the side of the drive shaft 13 away from the barrel 12. The purpose of this arrangement is that when the drive shaft 13 drives the rotor 14 in the magnetic bearing 4 to rotate in the stator 28, the slide seat 38 is pushed to slide on the slideway 37 along the length direction of the slideway 37. The third eddy current displacement sensor 36 moves with the slide 38 until the third eddy current displacement sensor 36 is moved to the side of the drive shaft 13 away from the sleeve barrel 12. At this time, the front and rear displacement of the drive shaft 13 is detected by the third eddy current displacement sensor 36, so that the front and rear displacement of the rotor 14 in the magnetic bearing 4 in the stator 28 can be detected. When the drive shaft 13 moves back and forth, the sleeve barrel 12, the transmission rod 32 and the transmission column 35 follow the drive shaft 13 to move back and forth. At this time, the transmission column 35 moves back and forth in the ring 34, which is simple and convenient to use.

[0031] The first eddy current displacement sensor 15 , the second eddy current displacement sensor 23 , and the third eddy current displacement sensor 36 may also be laser displacement sensors.

[0032] like Figure 7 and Figure 8 The inner wall surfaces of the two circular rings 34 are both arc-shaped surfaces 39. The purpose of this arrangement is that after the transmission column 35 contacts the inner wall of the circular ring 34, the friction resistance when the circular ring 34 pushes the transmission rod 32 to drive the barrel 12 to rotate through the transmission column 35 can be reduced through the arc-shaped surface 39 of the inner wall of the circular ring 34. At the same time, the friction resistance when the transmission column 35 contacts the inner wall of the circular ring 34 and the transmission column 35 moves back and forth in the circular ring 34 can be reduced, which is simple and convenient to use.

[0033] The directions in which the drive shaft 13 and the rotor 14 move forward and backward, left and right, and up and down are based on Figure 1 The moving direction of the middle driving shaft 13 and the rotor 14 is the standard.

[0034] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A magnetic bearing testing device, characterized in that: The invention comprises a fixing plate (1) and two first columns (2) arranged at the top of the fixing plate (1), a mounting plate (3) being arranged between the two first columns (2), and a mounting groove (5) for mounting a magnetic bearing (4) being provided on one side of the mounting plate (3), two second columns (6) being arranged opposite to each other at the top of the fixing plate (1), and a hanging plate (7) being arranged between the two second columns (6), the hanging plate (7) being opposite to the mounting plate (3) in front and back, and a rotating groove (8) being arranged on a side of the hanging plate (7) close to the mounting plate (3), and a rotating shaft (9) being rotatably connected in the rotating groove (8), and a rotating shaft (9) being provided on the fixing plate (1) through a fixing frame for driving the fixing plate (1). A motor (10) for rotating a rotating shaft (9), wherein a sleeve barrel (12) is provided on a side of the rotating shaft (9) close to a mounting plate (3) through a transmission member, and a drive shaft (13) is coaxially mounted on the sleeve barrel (12), and an end of the drive shaft (13) away from the sleeve barrel (12) passes through a rotor (14) of a magnetic bearing (4) and is connected to the rotor (14), and two first eddy current displacement sensors (15) are provided on a side of the mounting plate (3) away from the suspension plate (7) through a mounting frame, and are located above and to the right of the drive shaft (13), respectively. The two first eddy current displacement sensors (15) are used to detect left-right and up-down displacements of the drive shaft (13), respectively.

2. A magnetic bearing testing device as claimed in claim 1, characterized in that: The transmission member comprises a first shaft (16), a second shaft (17) and a rectangular block (18); the first shaft (16) and the second shaft (17) are opposite to each other front to back; two first connecting plates (19) are provided on a side of the first shaft (16) close to the second shaft (17); the two first connecting plates (19) are opposite to each other left to right; two second connecting plates (20) are provided on a side of the second shaft (17) close to the first shaft (16); the two second connecting plates (20) are opposite to each other up to down; the rectangular block (18) is located between the two first connecting plates (19); the left and right sides of the rectangular block (18) are both rotatably connected to the first connecting plates (19); the upper and lower ends of the rectangular block (18) are both rotatably connected to the second connecting plates (20); the second shaft (17) is arranged on a rotating shaft (9); and the sleeve barrel (12) is arranged on a side of the first shaft (16) away from the second shaft (17).

3. A magnetic bearing testing device as claimed in claim 2, characterized in that: A rectangular groove (21) is provided on a side of the first shaft (16) facing away from the second shaft (17), and a sliding rod (22) is horizontally inserted in the rectangular groove (21). The side of the sliding rod (22) facing away from the bottom of the rectangular groove (21) extends outside the rectangular groove (21). The sleeve barrel (12) is arranged at an end of the sliding rod (22) extending outside the rectangular groove (21). A second eddy current displacement sensor (23) for detecting the forward and backward displacement of the drive shaft (13) is provided on the fixed plate (1) via a first sliding member.

4. A magnetic bearing testing device as claimed in claim 3, characterized in that: The first sliding member comprises a slide rail (24) arranged at the top end of the fixed plate (1), and an inverted T-shaped slide plate (25) is horizontally slidably connected to the slide rail (24), and the second eddy current displacement sensor (23) is mounted on the slide plate (25) and corresponds to a side of the drive shaft (13) facing away from the barrel (12).

5. A magnetic bearing testing device as claimed in claim 1, characterized in that: A plurality of threaded holes (26) are provided on the groove wall of the installation groove (5), and a first bolt (27) is threadedly connected in each threaded hole (26), and one end of each first bolt (27) close to the magnetic bearing (4) is tightly pressed against the outer wall of the stator (28) in the magnetic bearing (4), and the number of the first bolts (27) is four, and the four first bolts (27) are evenly distributed along the circumference of the installation groove (5).

6. A magnetic bearing testing device as claimed in claim 1, characterized in that: The two first upright posts (2) are both threaded rods, the top end of the mounting plate (3) is provided with two opposite through holes (29), the top ends of the two first upright posts (2) respectively pass through the two through holes (29), and the two first upright posts (2) are both threadedly connected with two nuts (30), and the two nuts (30) are respectively located at the upper and lower ends of the mounting plate (3) and both abut against the mounting plate (3).

7. A magnetic bearing testing device as claimed in claim 1, characterized in that: The transmission member comprises a column (31) and two transmission rods (32) arranged on the outer wall of the barrel (12), the two transmission rods (32) being opposed to each other up and down, the column (31) being coaxially arranged on the rotating shaft (9), and two circular rings (34) being arranged on the column (31) through a side plate (33), the two circular rings (34) being opposed to each other up and down, a transmission column (35) being arranged on one side of the two transmission rods (32) close to the circular rings (34), and ends of the two transmission columns (35) away from the transmission rods (32) respectively passing through the two circular rings (34) coaxially, the diameter of the transmission column (35) being smaller than the inner diameter of the circular ring (34), and a gap being provided between the inner wall of the circular ring (34) and the transmission column (35).

8. A magnetic bearing testing device as claimed in claim 7, characterized in that: A third eddy current displacement sensor (36) for detecting the forward and backward displacement of the drive shaft (13) is provided on the fixed plate (1) via a second sliding member.

9. A magnetic bearing testing device as claimed in claim 8, characterized in that: The second sliding member comprises a slideway (37) arranged at the top end of the fixed plate (1), and an inverted T-shaped slide seat (38) is horizontally slidably connected to the slideway (37), and the third eddy current displacement sensor (36) is mounted on the slide seat (38) and corresponds to a side of the drive shaft (13) facing away from the sleeve barrel (12).

10. A magnetic bearing testing device as claimed in claim 7, characterized in that: The inner wall surfaces of the two circular rings (34) are both arc-shaped surfaces (39).

Images