CN111237337A - Three-support double-group control multi-redundancy magnetic bearing system - Google Patents

Abstract

The three-support double-group control multi-redundancy magnetic bearing system comprises a lower base, an upper base, a magnetic bearing assembly and a main shaft, wherein the magnetic bearing assembly comprises a stator core, a rotor core, a permanent magnet group, a first magnetic bearing control coil and a second magnetic bearing control coil are arranged in the stator core, the permanent magnet group, the first magnetic bearing control coil and the second magnetic bearing control coil are sleeved on the outer ring of the rotor core, the permanent magnet group is positioned in the middle of the rotor core, and the first magnetic bearing control coil and the second magnetic bearing control coil are positioned on two sides of the permanent magnet group; compared with the prior art, the single magnetic bearing component is adopted to support the high-speed shaft, the bearing is in physical contact with the main shaft, contact friction heat generation is avoided, meanwhile, the arrangement of the first magnetic bearing control coil and the second magnetic bearing control coil enables the axial span distance to be large, the whole system is sensitive to the inclination of the main shaft, and the inclination displacement of the main shaft is easily detected by installing the radial displacement sensor.

Description

Three-support double-group control multi-redundant magnetic bearing system

technical field

The invention belongs to the technical field of magnetic bearings, in particular to a three-support double-group control multi-redundant magnetic bearing system.

Background technique

Magnetic bearing is a new type of high-performance bearing. Compared with traditional ball bearings, sliding bearings and oil film bearings, magnetic bearings have no mechanical contact, and the rotor can reach a high speed. It has the advantages of small size, long life, no lubrication, no oil pollution, etc. It is especially suitable for high-speed, vacuum, ultra-clean and other special environments. It can be widely used in machining, turbomachinery, aerospace, vacuum technology, rotor dynamic characteristics identification and testing and other fields, and is recognized as a very promising new type of bearing.

The magnetic bearing uses the electric field force and the magnetic field force to suspend the shaft during use, and the shaft is suspended by controlling the coil. During the use of the main shaft, the main shaft will generate a certain amount of vibration during the rotation process. When they are in contact with each other, a certain frictional heat generation phenomenon will occur, which will affect the thermal deformation of the bearing and cause thermal damage to the bearing, and affect the stability of the main shaft during the rotation process. In the same radial plane, the axial and radial arrangements are relatively compact, and it is difficult to detect and control in terms of controlling the axial inclination and maintaining the stability of the shaft.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned defects in the prior art, the present invention provides a three-support, two-group-controlled, and multi-redundant magnetic bearing system that is easy to detect, stable, efficient, safe and reliable.

In order to achieve the above purpose, the technical scheme adopted in the present invention is: a three-support double-group control multi-redundant magnetic bearing system, including a lower base, an upper base, a magnetic bearing assembly and a main shaft, and the upper base and the lower base are located on the upper and lower sides of the magnetic bearing assembly. On both sides, and the upper base and the lower base are formed with arc-shaped grooves that are compatible with the magnetic bearing assembly, the main shaft passes through the magnetic bearing assembly, and the magnetic bearing assembly includes a stator iron core, and the stator iron core is provided with a rotor iron core, a permanent The magnet group, the first magnetic bearing control coil and the second magnetic bearing control coil, the permanent magnet group, the first magnetic bearing control coil and the second magnetic bearing control coil are sleeved on the outer ring of the rotor iron core, and the permanent magnet group is located in the rotor In the middle of the iron core, the first magnetic bearing control coil and the second magnetic bearing control coil are located on both sides of the permanent magnet group.

As a preferred solution of the present invention, an air gap exists between the permanent magnet group and the stator iron core, and an air gap exists between the stator iron core and the rotor iron core, and a flux linkage is formed between the rotor iron core and the permanent magnet group loop.

As a preferred solution of the present invention, an air gap exists between the first magnetic bearing control coil and the stator iron core, an air gap exists between the stator iron core and the rotor iron core, and the rotor iron core and the first magnetic bearing control coil A magnetic link loop is formed between them.

As a preferred solution of the present invention, an air gap exists between the second magnetic bearing control coil and the stator iron core, an air gap exists between the stator iron core and the rotor iron core, and the rotor iron core and the second magnetic bearing control coil A magnetic link loop is formed between them.

As a preferred solution of the present invention, the permanent magnet group, the first magnetic bearing control coil and the second magnetic bearing control coil are all multi-pole structures.

As a preferred solution of the present invention, connecting bolts are arranged between the upper base and the lower base, and anchor bolts are arranged on the lower base.

As a preferred solution of the present invention, two ends of the rotor core are respectively provided with a positioning snap ring and a shaft end locking nut, and the main shaft is provided with a thread matching the shaft end locking nut.

As a preferred solution of the present invention, both ends of the rotor core are further provided with a first bearing end cover and a second bearing end cover, respectively, and the second bearing end cover and the first bearing end cover are arranged opposite to the positioning snap ring and the second bearing end cover. Outside the shaft end lock nut.

As a preferred solution of the present invention, the first bearing end cover and the second bearing end cover are connected to the upper base and the lower base.

As a preferred solution of the present invention, there is a gap between the positioning snap ring and the second bearing end cover, and there is also a gap between the shaft end locking nut and the first bearing end cover.

The beneficial effect of the present invention is that, compared with the prior art, a single magnetic bearing assembly is used to support the high-speed shaft, and the bearing and the main shaft are in physical contact to avoid contact friction heat generation, thermal deformation of materials, thermal damage, etc., and at the same time Through the setting of the first magnetic bearing control coil and the second magnetic bearing control coil, the axial span distance is large, and the whole system is sensitive to the inclination of the main shaft. By installing the radial displacement sensor, it is easy to detect the inclination displacement of the main shaft. .

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is an exploded view of the present invention;

Figure 3 is a schematic structural diagram of a magnetic bearing assembly;

Figure 4 is an exploded view of the magnetic bearing assembly;

Reference numerals in the figure: main shaft 1, second bearing end cover 2, positioning snap ring 3, rotor iron core 4, stator iron core 5, upper base 6, permanent magnet group 7, first magnetic bearing control coil 8, first Bearing end cover 9 , shaft end locking nut 10 , lower base 11 , second magnetic bearing control coil 12 .

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Figure 1-4, the three-support dual-group control multi-redundant magnetic bearing system includes a lower base 11, an upper base 6, a magnetic bearing assembly and a main shaft 1. The upper base 6 and the lower base 11 are located on the upper and lower sides of the magnetic bearing assembly. The upper base 6 and the lower base 11 are formed with arc-shaped grooves that are adapted to the magnetic bearing assembly. The main shaft 1 passes through the magnetic bearing assembly. The magnetic bearing assembly includes a stator iron core 5, and a rotor is arranged in the stator iron core 5. The iron core 4, the permanent magnet group 7, the first magnetic bearing control coil 8 and the second magnetic bearing control coil 12, the permanent magnet group 7, the first magnetic bearing control coil 8 and the second magnetic bearing control coil 12 are sleeved on the rotor iron The outer ring of the core 4 , the permanent magnet group 7 is located in the middle of the rotor core 4 , and the first magnetic bearing control coil 8 and the second magnetic bearing control coil 12 are located on both sides of the permanent magnet group 7 .

The rotor iron core 4 is installed on the high-speed rotating main shaft 1. There is no relative motion between the rotor iron core 4 and the high-speed rotating main shaft 1, and the rotor iron core 4 rotates together with the main shaft 1 at high speed. Part of two different stator core punches are stacked. The central stator core punch is mainly used to limit the radial degree of freedom of the permanent magnet group 7 and perform radial positioning of the permanent magnet group 7; On both sides of the inner side, the first magnetic bearing control coil 8 and the second magnetic bearing control coil 12 are installed on the iron core coil support, the coil support protruding inward, the first magnetic bearing control coil 8 and the second magnetic bearing control coil 8 are arranged. Coil 12.

There is an air gap between the permanent magnet group 7 and the stator iron core 5, and there is an air gap between the stator iron core 5 and the rotor iron core 4, and a flux linkage loop is formed between the rotor iron core 4 and the permanent magnet group 7, which is used to control The spindle 1 axle load and the steady load component of the load on the axle.

There is an air gap between the first magnetic bearing control coil 8 and the stator iron core 5 , an air gap exists between the stator iron core 5 and the rotor iron core 4 , and a flux linkage is formed between the rotor iron core 4 and the first magnetic bearing control coil 8 There is an air gap between the second magnetic bearing control coil 12 and the stator iron core 5 , an air gap exists between the stator iron core 5 and the rotor iron core 4 , and an air gap is formed between the rotor iron core 4 and the second magnetic bearing control coil 12 Magnetic link loop.

Stability control is performed on the shaft weight of the main shaft 1 and the eccentric load component of the load on the shaft, that is, the coil magnetic flux is generated by controlling the amplitude of the DC current of each control coil of the first magnetic bearing control coil 8 and the second magnetic bearing control coil 12 , to control the axle load and the eccentric load component of the load on the axle.

The permanent magnet group 7 , the first magnetic bearing control coil 8 and the second magnetic bearing control coil 12 are all multi-pole structures. Preferably, the permanent magnet group 7 , the first magnetic bearing control coil 8 and the second magnetic bearing control coil 12 are all A three-pole symmetrical pole group is adopted, in which the coil axial end faces of the first magnetic bearing control coil 8 and the second magnetic bearing control coil 12 are consistent and linearly distributed to jointly control the shaft load of the main shaft 1 and the offset of the load on the shaft The magnitude and spatial phase of the unstable component. In the control of the degree of freedom of the spindle 1, it has a typical redundant feature, one side of the coil fails, and the other side of the control coil still works. The coil magnetic poles of the first magnetic bearing control coil 8 and the second magnetic bearing control coil 12 at the same position are powered at the same time, and the generated force generates a force couple, which can further reduce and suppress the vibration of the main shaft 1 and ensure that the main shaft 1 has a higher stability.

There are connecting bolts between the upper base 6 and the lower base, and the lower base 11 is provided with anchor bolts. A single magnetic bearing assembly is installed between the upper base 6 and the lower base 11. shape, to limit the axial movement of a single magnetic bearing assembly, the upper base 6 and the lower base 11 are connected by connecting bolts to limit the longitudinal movement of the magnetic bearing assembly, the lower end of the entire lower base 11 is connected to the floor through anchor bolts, limiting the overall exercise.

Both ends of the rotor iron core 4 are respectively provided with a positioning snap ring 3 and a shaft end locking nut 10, the main shaft 1 is provided with a thread that is adapted to the shaft end locking nut 10, and both ends of the rotor iron core 4 are respectively provided with a second thread. A bearing end cap 9 and a second bearing end cap 2, the second bearing end cap 2 and the first bearing end cap 9 are relatively arranged outside the positioning snap ring 3 and the shaft end locking nut 10, the first bearing end cap 9 and the first bearing end cap 9 The two bearing end caps 2 are connected to the upper base 6 and the lower base 11 .

One end of the rotor iron core 4 is axially positioned by the positioning snap ring 3, and the other end of the rotor iron core 4 is screwed with the thread on the main shaft 1 through the shaft end locking nut 10 to limit the axial freedom of the rotor iron core 4. Spindle 1 performs axial positioning control. A single magnetic bearing assembly is bolted between the second bearing end cover 2 and the first bearing end cover 9 and the bearing upper base 6 and the bearing lower base 11, so as to protect the magnetic bearing assembly to a certain extent.

There is a gap between the positioning snap ring 3 and the second bearing end cover 2 , and there is also a gap between the shaft end locking nut 10 and the first bearing end cover 9 , so as to control the degree of freedom of the main shaft 1 within a certain range.

A keyway is formed at the end of the main shaft 1. Under the action of the keyway, the keyway is connected to an external motor or other power source, and external power or other power is input to drive the main shaft 1 to rotate at a high speed.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention; thus , the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Although the reference numbers in the figures are used more in this paper: main shaft 1, second bearing end cover 2, positioning snap ring 3, rotor iron core 4, stator iron core 5, upper base 6, permanent magnet group 7, first magnetic Bearing control coil 8, first bearing end cap 9, shaft end lock nut 10, lower base 11, second magnetic bearing control coil 12, etc. terms, but do not exclude the possibility of using other terms; these terms are used only for the purpose of It is more convenient to describe and explain the essence of the present invention; it is contrary to the spirit of the present invention to interpret them as any kind of additional limitation.

Claims (10)

1. Three support double-group control multi-redundancy magnetic bearing system, including lower base (11), go up base (6), magnetic bearing subassembly and main shaft (1), go up base (6) and lower base (11) and be located the upper and lower both sides of magnetic bearing subassembly, and be formed with the arc wall with magnetic bearing subassembly looks adaptation on going up base (6) and lower base (11), main shaft (1) passes the magnetic bearing subassembly, a serial communication port, the magnetic bearing subassembly includes stator core (5), be equipped with rotor core (4) in stator core (5), permanent magnet group (7), first magnetic bearing control coil (8) and second magnetic bearing control coil (12) cup joint in the outer lane of rotor core (4), and permanent magnet group (7) are located rotor core (4) middle part, first magnetic bearing control coil (8) and second magnetic bearing control coil (12) are located permanent magnet group (7) ) Two sides.

2. The three support dual group control multi-redundant magnetic bearing system of claim 1 wherein an air gap exists between the permanent magnet groups (7) and the stator core (5) and an air gap exists between the stator core (5) and the rotor core (4), and a flux linkage loop is formed between the rotor core (4) and the permanent magnet groups (7).

3. The three support dual set control multi-redundant magnetic bearing system of claim 1 wherein an air gap exists between the first magnetic bearing control coils (8) and the stator core (5), an air gap exists between the stator core (5) and the rotor core (4), and a flux linkage loop is formed between the rotor core (4) and the first magnetic bearing control coils (8).

4. The three support, dual set, controlled, multi-redundant magnetic bearing system of claim 1 wherein an air gap exists between the second magnetic bearing control coils (12) and the stator core (5), an air gap exists between the stator core (5) and the rotor core (4), and a flux linkage loop is formed between the rotor core (4) and the second magnetic bearing control coils (12).

5. The three support dual-set controlled multi-redundant magnetic bearing system of claim 1 wherein the permanent magnet set (7), first magnetic bearing control coil (8) and second magnetic bearing control coil (12) are all of multi-pole construction.

6. The three-support double-group controlled multi-redundant magnetic bearing system according to claim 1, wherein connecting bolts are provided between the upper base (6) and the lower base, and anchor bolts are provided on the lower base (11).

7. The three-support double-set control multi-redundancy magnetic bearing system according to claim 1, wherein the two ends of the rotor core (4) are respectively provided with a positioning snap ring (3) and a shaft end locking nut (10), and the main shaft (1) is provided with a thread matched with the shaft end locking nut (10).

8. The three-support double-group control multi-redundancy magnetic bearing system according to claim 7, wherein the two ends of the rotor core (4) are further respectively provided with a first bearing end cover (9) and a second bearing end cover (2), and the second bearing end cover (2) and the first bearing end cover (9) are oppositely arranged outside the positioning snap ring (3) and the shaft end locking nut (10).

9. The three support dual set control multi-redundant magnetic bearing system of claim 8, wherein the first bearing end cap (9) and the second bearing end cap (2) are connected with an upper base (6) and a lower base (11).

10. The three support dual set control multi-redundant magnetic bearing system of claim 8 wherein a gap exists between the retaining snap ring (3) and the second bearing end cap (2) and a gap also exists between the shaft end lock nut (10) and the first bearing end cap (9).

Images