CN210981697U

CN210981697U - Radial magnetic bearing rigidity testing device

Info

Publication number: CN210981697U
Application number: CN201921825278.7U
Authority: CN
Inventors: 张寅�; 王坤; 董宝田; 乐韵; 周金祥; 毛琨; 马建
Original assignee: Beijing Kuntengmig Technology Co ltd
Current assignee: Beijing Kuntengmig Technology Co ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-07-10
Anticipated expiration: 2029-10-28

Abstract

The utility model relates to a magnetic suspension bearing technical field provides a radial magnetic bearing rigidity testing arrangement, and this testing arrangement is including the bearing fixing device who is used for arranging the radial magnetic bearing that awaits measuring, await measuring radial magnetic bearing with bearing fixing device rotates the connection on vertical face, still includes the vertical Z that arranges to the slide rail, sliding connection has the rotor fixing device who is used for arranging the rotor on the slide rail of Z, rotor fixing device with be connected with force sensor between the periphery of rotor, force sensor with effort direction between the rotor is in vertical direction and effort direction perpendicular to the axial lead of rotor. The acting force generated to the rotor when the electromagnetic coil is electrified can be accurately collected through the force sensor, and the current rigidity and the displacement rigidity of the radial magnetic bearing to be measured can be accurately calculated according to the acting force corresponding to the current and the rotor displacement height.

Description

Radial magnetic bearing rigidity testing device

Technical Field

The utility model belongs to the technical field of the magnetic suspension bearing, in particular to radial magnetic bearing rigidity testing arrangement.

Background

Small motors are the most common form of converting electrical energy into mechanical energy and have wide application in the household and industrial fields. The traditional motor mainly comprises a motor stator part, a motor rotor part, a rotor supporting bearing and a machine shell part, wherein the motor stator part and the motor rotor part are connected through a mechanical bearing or are in mechanical contact, so that mechanical friction exists in the motion process of an electronic rotor. Mechanical friction can reduce the rotational speed of rotor to a certain extent, and mechanical friction can produce noise, wearing and tearing component simultaneously, produces heat and causes other negative problems, finally shortens motor life, consequently, in order to realize the operation of super high rotational speed and the long-life of equipment, clean oilless must adopt non-contact support mode, the magnetic suspension support mode promptly in the motor.

A radial magnetic bearing is adopted in a magnetic suspension motor to complete the radial limit of a rotor, and the rigidity of the radial magnetic bearing is an important design parameter and determines a plurality of control parameters of the radial magnetic bearing. The existing test scheme is as follows: the rigidity of the radial magnetic bearing is measured when the magnetic bearing is installed in a complete machine, but before the complete machine is assembled, whether the rigidity of the radial magnetic bearing is qualified or not cannot be known, if the rigidity of the radial magnetic bearing is not qualified, the radial magnetic bearing needs to be disassembled from the complete machine, the mechanical precision can be reduced when the radial magnetic bearing is disassembled and assembled every time, and the time for disassembling and assembling is long; there is also a proposal described in patent CN 106840668A for a stiffness testing device and a testing method for a magnetic suspension bearing, but the rotor is fixed, the radial magnetic bearing stiffness is tested by moving the stator left and right, the measured value includes friction factors, the measurement accuracy is not high, and the friction magnitude cannot be determined.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a radial magnetic bearing rigidity testing arrangement ensures the quick accurate rigidity parameter who measures radial magnetic bearing of ability.

In order to achieve the purpose, the utility model adopts the following technical scheme: a rigidity testing device for a radial magnetic bearing comprises a bearing fixing device used for arranging the radial magnetic bearing to be tested, the radial magnetic bearing to be tested is connected with the bearing fixing device in a rotating mode on a vertical surface, the rigidity testing device further comprises a Z-direction slide rail which is vertically arranged, a rotor fixing device used for arranging a rotor is connected onto the Z-direction slide rail in a sliding mode, a force sensor is connected between the rotor fixing device and the periphery of the rotor, the acting force direction between the force sensor and the rotor is in the vertical direction, and the acting force direction is perpendicular to the axial lead of the rotor.

Optionally, the bearing fixing device is an L-shaped plate formed by a vertical section and a horizontal section, the radial magnetic bearing to be tested is rotatably connected with the vertical section, and the Z-direction slide rail is arranged on the horizontal section.

Optionally, an X-direction sliding rail is horizontally arranged on the horizontal section, the X-direction sliding rail is parallel to the axial direction of the radial magnetic bearing to be tested, and the Z-direction sliding rail is slidably connected to the X-direction sliding rail.

Optionally, a Y-direction slide rail perpendicular to the X-direction slide rail is horizontally arranged on the horizontal section, and the X-direction slide rail is slidably connected to the Y-direction slide rail.

Optionally, the rotor fixing device includes a top plate arranged above the rotor, the force sensor is arranged between the top plate and the rotor, a side plate arranged in parallel with the end face of the rotor is arranged on one side of the top plate in a downward extending mode, the side plate is connected with the Z-direction sliding rail in a sliding mode, and a limiting block in sliding fit with the rotor in the vertical direction is arranged on the side plate.

Optionally, a displacement sensor for detecting a change in displacement of the rotor in the vertical direction is further included.

Optionally, a mounting bracket is arranged on a horizontal section of the bearing fixing device, the mounting bracket is located below the rotor, and the displacement sensor is arranged on the mounting bracket.

Optionally, a transition connection piece is arranged between the radial magnetic bearing to be tested and the bearing fixing device, the transition connection piece includes a fixed disc rotationally connected with the bearing fixing device, and the radial magnetic bearing to be tested is coaxially arranged on the fixed disc.

Optionally, a plurality of grooves are uniformly formed in the fixed disc, the length direction of each groove is in the radial direction of the fixed disc, fixture blocks are slidably connected in the grooves, the fixture blocks protrude from the surface of the fixed disc, the radial magnetic bearing to be measured is arranged between the fixture blocks, and a locking device for fixing the fixture blocks is arranged on the fixed disc.

Optionally, locking device including coaxial arrange in the support ring of the periphery of fixed disc, the support ring with be connected with the footpath strip between the fixed disc, be provided with a plurality ofly on the support ring and be in fixed disc is radial ascending screw rod, the screw rod contradicts to the outer end of fixture block.

Compared with the prior art, the bearing fixing device is arranged for bearing the radial magnetic bearing to be tested, and the rotation angle of the radial magnetic bearing to be detected can be relatively adjusted so as to detect two pairs of magnetic poles on the radial magnetic bearing to be detected, the Z-direction slide rail is also arranged so as to adjust the position of the rotor in the vertical direction, meanwhile, the rotor is horizontally arranged, the rotor and the force sensor are stressed only in the vertical direction, the measuring direction of the force sensor is the same as the gravity direction, the gravity of the rotor can be eliminated as a system error through a calibration sensor, namely, the acting force generated to the rotor when the electromagnetic coil is electrified can be accurately collected through the force sensor, the collected acting force is not influenced by any friction force, and the current rigidity and the displacement rigidity of the radial magnetic bearing to be measured can be accurately calculated according to the magnitude of the acting force corresponding to the current and the displacement height of the rotor.

Drawings

Fig. 1 is a first perspective view of the present invention;

FIG. 2 is a second perspective view of the present invention;

fig. 3 is a third schematic perspective view of the present invention, wherein the bearing fixing device is not shown;

FIG. 4 is a schematic diagram of the combination of the fixed disk and the radial magnetic bearing to be measured;

FIG. 5 is a front view of the fixed disk and the radial magnetic bearing to be measured.

Reference numerals:

1. a radial magnetic bearing to be tested; 2. a bearing fixing device; 21. fixing the disc; 22. a groove; 23. a clamping block; 24. a support ring; 25. a radial strip; 26. a screw; 3. a rotor; 4. a rotor fixing device; 41. a top plate; 42. a side plate; 43. a limiting block; 5. a force sensor; 6. a displacement sensor; 7. a Z-direction slide rail; 8. an X-direction slide rail; 9. a Y-direction slide rail; 10. and (7) mounting a bracket.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are some, but not all embodiments of the invention. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting. All other embodiments, which can be derived from the description of the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.

As shown in fig. 1 and 2, the utility model provides a radial magnetic bearing rigidity testing arrangement, including the bearing fixing device 2 that is used for arranging radial magnetic bearing 1 that awaits measuring, adopt bearing fixing device 2 to fix radial magnetic bearing 1 that awaits measuring, include two pairs of magnetic poles of mutually perpendicular on the circumference of radial magnetic bearing 1 that awaits measuring, rotate radial magnetic bearing 1 that awaits measuring and make one of them pair of magnetic pole be in the vertical direction on, rotor fixing device 4 makes rotor 3 be in the horizontal direction and the axial lead of rotor 3 and the axial lead of radial magnetic bearing 1 that awaits measuring share same vertical plane through force transducer 5, can adjust rotor 3 to move up or move down through rotor fixing device 4 and Z to slide rail 7 sliding fit on the vertical direction;

when measuring the current rigidity, the axial lead of the rotor 3 is collinear with the axial lead of the radial magnetic bearing 1 to be measured, different currents I are introduced into the radial magnetic bearing 1 to be measured, and each output value F measured by the force sensor 5 at the moment is correspondingly recorded_ICurrent stiffness K_I＝F_II; then, the rotor 3 is adjusted to move up or down, and the current rigidity of the radial magnetic bearing 1 to be measured under different displacements is recorded; then fitting the current rigidity of each group;

when measuring the displacement rigidity, constant current is introduced into the radial magnetic bearing 1 to be measured, the rotor 3 is moved upwards or downwards in the vertical direction to record the displacement S, and each output value F measured by the force sensor 5 at the moment is correspondingly recorded_SD.displacement stiffness K_S＝F_S(ii) S; then changing the introduced current, and recording the displacement rigidity of the radial magnetic bearing 1 to be tested under different currents; then fitting each group of displacement stiffness;

and then, rotating the radial magnetic bearing 1 to be measured to enable the next pair of magnetic poles to be in the vertical direction, and measuring the current stiffness and the displacement stiffness of the next pair of magnetic poles.

Compared with the prior art, the bearing fixing device 2 is arranged for bearing the radial magnetic bearing 1 to be tested, and the rotation angle of the radial magnetic bearing 1 to be measured can be relatively adjusted so as to detect two pairs of magnetic poles on the radial magnetic bearing 1 to be measured, the Z-direction slide rail 7 is also arranged so as to adjust the position of the rotor 3 in the vertical direction, meanwhile, the rotor 3 is horizontally arranged, the rotor 3 and the force sensor 5 are stressed only in the vertical direction, the measuring direction of the force sensor 5 is the same as the gravity direction, the gravity of the rotor can be eliminated as a system error through a calibration sensor, namely, the acting force generated to the rotor 3 when the electromagnetic coil is electrified can be accurately collected through the force sensor 5, the collected acting force is not influenced by any friction force, and the current rigidity and the displacement rigidity of the radial magnetic bearing 1 to be measured can be accurately calculated according to the magnitude of the acting force corresponding to the current and the displacement height of the rotor 3.

In some embodiments, as shown in fig. 1, fig. 2 and fig. 3, the bearing fixing device 2 is an L-shaped plate composed of a vertical section and a horizontal section, so that the radial magnetic bearing 1 to be tested can be conveniently and rotatably arranged on the vertical section, and the Z-shaped slide rail 7 can be arranged on the horizontal section, of course, the arrangement form of the L-shaped plate is only used as a supporting base to arrange the above components into an integral structure.

In some embodiments, as shown in fig. 1, fig. 2 and fig. 3, before testing, it is first ensured that the X-direction slide rails 8 are axially parallel to and co-located with the same vertical plane as the radial magnetic bearing 1 to be tested, and then during testing, the Z-direction slide rails 7 move relative to the X-direction slide rails 8 to adjust the rotor 3 to extend into or extend out of the inner cavity of the radial magnetic bearing 1 to be tested, and the rotor fixing device 4 moves relative to the Z-direction slide rails 7 to adjust the rotor 3 to move up or down.

In some embodiments, as shown in fig. 1, fig. 2 and fig. 3, a Y-directional slide rail 9 perpendicular to the X-directional slide rail 8 is horizontally disposed on the horizontal section, and the X-directional slide rail 8 is slidably connected to the Y-directional slide rail 9; the X-direction slide rail 8, the Y-direction slide rail 9 and the Z-direction slide rail 7 form a three-dimensional displacement platform, and the relative position of the rotor 3 and the radial magnetic bearing 1 to be measured is adjusted through the mutual sliding connection relationship of the three-dimensional displacement platform.

In some embodiments, as shown in fig. 3, the rotor fixing device 4 includes a top plate 41 disposed above the rotor 3, a side plate 42 disposed parallel to an end surface of the rotor 3 extends downward from one side of the top plate 41, the force sensor 5 extends downward from the top plate 41, a lower end of the force sensor 5 is perpendicularly connected to the rotor 3, the force sensor 5 accurately detects an acting force applied to the rotor 3 in a vertical direction, the side plate 42 is slidably connected to the Z-direction slide rail 7, and a limit block 43 configured to slidably fit with the rotor 3 in the vertical direction is disposed on the side plate 42; the radial magnetic bearing 1 that awaits measuring during circular telegram can apply the effort to the one end that rotor 3 stretches into the inner chamber, and force transducer 5's force measuring point is at rotor 3's middle section position this moment, can produce moment this moment, and the setting of stopper 43 is for eliminating moment, and further inject rotor 3 atress in vertical direction, ensures the accurate atress of gathering rotor 3 of force transducer 5, and rotor 3 and stopper 43 may produce frictional force certainly, but this frictional force minimum can neglect.

In some embodiments, as shown in fig. 3, a displacement sensor 6 is further provided for detecting a displacement change of the rotor 3 in the vertical direction, the displacement sensor 6 is disposed on the mounting bracket 10, and when the rotor 3 is adjusted to move in the vertical direction by the Z-slide 7, the displacement sensor 6 records the displacement change at that time, so as to facilitate accurate calculation of the stiffness parameter.

In some embodiments, as shown in fig. 4, the radial magnetic bearing 1 to be measured is directly connected to the bearing fixing device 2 in a rotating manner, which is more complicated to implement, so that the radial magnetic bearing 1 to be measured is firstly fixed on the fixed disk 21, and the fixed disk 21 is then connected to the bearing fixing device 2 in a rotating manner through the rotating shaft, thereby implementing the rotation angle adjustment of the radial magnetic bearing 1 to be measured.

In some embodiments, as shown in fig. 4, the radial magnetic bearing 1 to be measured is fixed in the form of a fixture block 23, when the radial magnetic bearing 1 to be measured is adjusted to rotate, the radial magnetic bearing 1 to be measured is fixed on a fixed disc 21, the fixed disc 21 is rotatably connected with the vertical section of the bearing fixing device 2, and the rotation angle of the radial magnetic bearing 1 to be measured is adjusted by directly rotating the fixed disc 21; in addition, the radial magnetic bearing 1 to be tested with different sizes can be loaded in the form that the fixture block 23 is matched with the groove 22, and the test is convenient.

In some embodiments, as shown in fig. 5, the cross-sectional shape of the groove 22 in the present application is "convex", the corresponding fixture block 23 is matched with the groove 22, so that the fixture block 23 cannot easily fall off from the groove 22, a part of the fixture block 23 protrudes from the groove 22, the inner end of the fixture block 23 abuts against the outer circumferential surface of the radial magnetic bearing 1 to be tested, the outer circumference of the fixed disc 21 is provided with the support ring 24, the support ring 24 is connected with the screw 26 along the radial direction by a thread, the screw 26 abuts against the outer end of the fixture block 23, so as to tightly lock the radial magnetic bearing 1 to be tested, the radial magnetic bearings 1 to be tested of different sizes can be correspondingly fixed by rotating the screw 26 and sliding the fixture block 23, and the. Certainly, the radial magnetic bearing 1 to be measured can be fixed in other forms, most conventional ways are that the radial magnetic bearing 1 to be measured is fixed on the fixed disc 21 by using an auxiliary connecting piece and a bolt, but the manner is complex, the radial magnetic bearing 1 to be measured cannot be rapidly disassembled, and the radial magnetic bearings 1 to be measured with different sizes cannot be conveniently disassembled, assembled and replaced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A radial magnetic bearing rigidity testing arrangement which characterized in that: the device comprises a bearing fixing device (2) used for arranging a radial magnetic bearing (1) to be tested, wherein the radial magnetic bearing (1) to be tested is connected with the bearing fixing device (2) in a rotating manner on a vertical surface, the device also comprises a Z-direction slide rail (7) which is vertically arranged, a rotor fixing device (4) used for arranging a rotor (3) is connected on the Z-direction slide rail (7) in a sliding manner, a force sensor (5) is connected between the rotor fixing device (4) and the periphery of the rotor (3), the acting force direction between the force sensor (5) and the rotor (3) is in the vertical direction, and the acting force direction is perpendicular to the axial lead of the rotor (3).

2. The rigidity testing device for the radial magnetic bearing according to claim 1 is characterized in that the bearing fixing device (2) is an L-shaped plate consisting of a vertical section and a horizontal section, the radial magnetic bearing (1) to be tested is rotationally connected with the vertical section, and the Z-direction slide rail (7) is arranged on the horizontal section.

3. The radial magnetic bearing stiffness testing device of claim 2, wherein: an X-direction sliding rail (8) is horizontally arranged on the horizontal section, the X-direction sliding rail (8) is parallel to the axial direction of the radial magnetic bearing (1) to be tested, and the Z-direction sliding rail (7) is connected to the X-direction sliding rail (8) in a sliding mode.

4. The radial magnetic bearing stiffness testing device of claim 3, wherein: and a Y-direction sliding rail (9) which is vertical to the X-direction sliding rail (8) is horizontally arranged on the horizontal section, and the X-direction sliding rail (8) is connected to the Y-direction sliding rail (9) in a sliding manner.

5. The radial magnetic bearing stiffness testing device of claim 1, wherein: rotor fixing device (4) including arrange in roof (41) of rotor (3) top, force sensor (5) arrange in roof (41) with between rotor (3), a side downwardly extending of roof (41) be provided with terminal surface parallel arrangement's of rotor (3) curb plate (42), curb plate (42) with Z is to slide rail (7) sliding connection, be provided with on curb plate (42) with rotor (3) constitute sliding fit's stopper (43) in vertical direction.

6. The radial magnetic bearing stiffness testing device of claim 2, wherein: the device also comprises a displacement sensor (6) for detecting the displacement change of the rotor (3) in the vertical direction.

7. The radial magnetic bearing stiffness testing device of claim 6, wherein: the horizontal section of the bearing fixing device (2) is provided with a mounting bracket (10), the mounting bracket (10) is positioned below the rotor (3), and the displacement sensor (6) is arranged on the mounting bracket (10).

8. The radial magnetic bearing stiffness testing device of claim 1, wherein: a transition connecting piece is arranged between the radial magnetic bearing (1) to be tested and the bearing fixing device (2), the transition connecting piece is a fixed disc (21) rotationally connected with the bearing fixing device (2), and the radial magnetic bearing (1) to be tested is coaxially arranged on the fixed disc (21).

9. The radial magnetic bearing stiffness testing device of claim 8, wherein: the device is characterized in that a plurality of grooves (22) are uniformly formed in the fixed disc (21), the length directions of the grooves (22) are located in the radial direction of the fixed disc (21), fixture blocks (23) are connected in the grooves (22) in a sliding mode, the surfaces of the fixture blocks (23) protrude relative to the fixed disc (21), the radial magnetic bearing (1) to be tested is arranged among the fixture blocks (23), and a locking device used for fixing the fixture blocks (23) is arranged on the fixed disc (21).

10. The radial magnetic bearing stiffness testing device of claim 9, wherein: locking device including coaxial arrangement in support ring (24) of the periphery of fixed disc (21), support ring (24) with be connected with between fixed disc (21) radial strip (25), be provided with a plurality of being in on support ring (24) fixed disc (21) radial ascending screw rod (26), screw rod (26) contradict to on fixture block (23).