CN1651780B - Magnetic suspension bearing system - Google Patents

Abstract

The invention provides a magnetic suspension bearing system (magnetic bearing system) for a rotating machine (rotate machine), which utilizes magnetic repulsion between magnetic assemblies (magnetic assemblies) formed by stacking (stack) of ring magnets (ring magnets) on a rotating shaft (spindle) on a rotor of the rotating machine and a spindle hole (spindle hole) for accommodating the rotating shaft on a stator seat of the rotating machine to provide non-contact rigid support for the rotating shaft in the radial direction.

Description

Magnetic Bearing System

technical field

The invention relates to a bearing system of a rotating machine, in particular to a magnetic bearing system.

Background technique

In today's rotating machinery, the mechanical bearings commonly used to provide the radial support of the rotating shaft and the rotational freedom of the rotating shaft are mainly sleeve bearings and ball bearings. As far as oil-impregnated bearings are concerned, since the oil content of oil-impregnated bearings will be lost due to the increase in use time or poor sealing, the friction between the oil-impregnated bearing shaft and the rotating shaft will increase, resulting in high temperature and noise, so it has gradually become unsuitable. High performance rotating machinery requirements. As for the ball bearings, since the wear of each ball is different when the balls are rolling, the motor will vibrate unexpectedly when it is rotating, resulting in relatively large noise.

FIG. 1 is a partial cross-sectional view of a conventional fan motor (fan motor) 1, wherein the rotating shaft 111 on the rotor 11 is accommodated by the spindle hole 121 on the stator base 12. As shown in the figure, the fan motor 1 uses two ball bearings 13 and 14 to constrain the rotating shaft 111 to limit the possible run out of the rotating shaft 111 in the radial direction, thereby providing support for the rotating shaft 111 in the radial direction; And a spring (spring) 15 is used to provide the axial support of the rotating shaft 111; and a C-shaped buckle (C Retaining ring) 16 is used to fix the rotating shaft 111. However, because the ball bearings 13 and 14 have the above-mentioned noise problem, and the fan motor shaft 111 is in contact with the ball bearings 13 and 14, the spring 15 and the C-shaped buckle 16, the contact area in the radial direction is too large. Large, so the fan motor will generate great noise and high temperature due to large-area contact friction during operation, which will easily cause the life of the fan motor 1 to be shortened.

In order to provide axial and radial support for a rotating machine such as a fan motor and simultaneously reduce mechanical wear and noise generated during its operation, thereby increasing the life of the rotating machine, the present invention proposes a rotating machine Magnetic bearing system.

Contents of the invention

The present invention proposes a magnetic bearing system for a rotating machine, which uses the magnetic repulsion between the magnetic components respectively located on the rotating shaft on the rotor of the rotating machine and on the mandrel hole on the stator seat of the rotating machine to accommodate the rotating shaft to provide the rotating shaft in the radial direction. The non-contact rigid support can effectively reduce the mechanical wear, noise and vibration generated during the operation of the rotating machinery, thereby increasing the speed and prolonging the service life of the rotating machinery and the bearing system.

To achieve the above object, the present invention provides a magnetic bearing system, comprising:

a rotating shaft;

a mandrel hole, located on a stator seat, for accommodating the rotating shaft;

A first magnetic component, fixed on the side wall of the rotating shaft, consists of at least one ring-shaped magnet with opposite polarities and axial magnetization at both ends;

A second magnetic component is fixed on the side wall of the mandrel hole and consists of at least one annular magnet with opposite polarities and axial magnetization at both ends, wherein the annular magnet of the first magnetic component is connected to the second magnetic component. The ring magnets of the two magnetic components are opposite to each other with the same polarity, and a different polar interface of each ring magnet on the first magnetic component is offset by a distance relative to a different polar interface of the corresponding ring magnet on the second magnetic component; and

At least one thrust bearing is fixed on the stator base to limit the axial movement of the rotating shaft away from the stator base.

The present invention also provides a magnetic bearing system, including:

a rotating shaft;

a mandrel hole, located on a stator seat, for accommodating the rotating shaft;

A first magnetic component is fixed on the side wall of the rotating shaft and consists of at least one ring-shaped magnet with opposite polarities at both ends;

a second magnetic assembly, fixed on the side wall of the mandrel hole, consisting of at least one ring magnet with opposite polarity at both ends; and

A support assembly, including a first thrust bearing, fixed on the stator seat, which provides an axial force against the movement of the rotating shaft in a first direction in the axial direction; a second thrust bearing, fixed located on the stator base, which provides an axial force against movement of the rotating shaft in a second direction in the axial direction, the second direction being opposite to the first direction;

Wherein, the ring magnet of the first magnetic assembly is opposite to the ring magnet of the second magnetic assembly at the same pole, wherein the thickness of at least one ring magnet on the first magnetic assembly is the same as that of the corresponding ring magnet on the second magnetic assembly. Magnets come in different thicknesses.

The present invention also provides a magnetic bearing system, including:

a rotating shaft;

a mandrel hole, located on a stator seat, for accommodating the rotating shaft;

A first magnetic component, fixed on the side wall of the rotating shaft, consists of at least one ring-shaped magnet with opposite polarities and axial magnetization at both ends;

A second magnetic component is fixed on the side wall of the mandrel hole and consists of at least one annular magnet with opposite polarities and axial magnetization at both ends, wherein the annular magnet of the first magnetic component is connected to the second magnetic component. The ring magnets of the two magnetic components are opposite to each other with the same pole, and a different polar interface of each ring magnet on the first magnetic component is on the same plane as a different polar interface of the corresponding ring magnet on the second magnetic component; and

At least one thrust bearing is fixed on the stator base to limit the axial movement of the rotating shaft away from the stator base.

The present invention also provides a magnetic bearing system, including:

a rotating shaft;

a mandrel hole, located on a stator seat, for accommodating the rotating shaft;

A first magnetic component, fixed on the side wall of the rotating shaft, consists of at least one ring-shaped magnet with opposite polarities and axial magnetization at both ends;

A second magnetic component, fixed on the side wall of the spindle hole, consists of at least one ring magnet with opposite polarities and axial magnetization at both ends; and

a supporting component coaxial with the rotating shaft and in direct contact with the rotating shaft, the supporting component interacts with the first magnetic component and the second magnetic component to limit the axial movement of the rotating shaft in the stator base;

Wherein, the ring magnet of the first magnetic assembly is opposite to the ring magnet of the second magnetic assembly with the same polarity, wherein a different pole interface of each ring magnet on the first magnetic assembly is opposite to the second magnetic assembly A heteropolar interface corresponding to the upper ring magnet is offset downward by a distance.

The present invention also provides a magnetic bearing system, including:

a shaft, the end of which is shaped to form a contact surface;

a mandrel hole, located on a stator seat, for accommodating the rotating shaft;

a first magnetic component fixed on the rotating shaft;

a second magnetic component fixed on the side wall of the spindle hole; and

A supporting component, one surface of which is in point contact with the contact surface of the rotating shaft, provides an axial force against the rotating shaft.

Generally speaking, the magnetic bearing system proposed by the present invention includes a rotating shaft, a spindle hole for accommodating the rotating shaft, a first magnetic component, a second magnetic component and a supporting component. The first magnetic component is installed on the side wall of the rotating shaft, and it includes a plurality of stacked ring magnets with opposite polarities at both ends, and the same poles of the ring magnets are connected. The second magnetic component is installed on the side wall of the mandrel hole, and includes a plurality of stacked ring magnets with opposite polarities at both ends, and the same poles of the ring magnets are connected. The support assembly is fixed on the stator base for axially supporting the rotating shaft.

In one embodiment, a heteropolar interface of each ring magnet of the first magnetic component is aligned with a heteropolar interface of each ring magnet of the second magnetic component.

In another embodiment, the second magnetic component is axially shifted by a distance relative to the first magnetic component.

The invention has the advantages of facilitating the assembly of the bearing, eliminating the large-area friction between the rotating shaft and the bearing in the radial direction and the noise caused by it, and prolonging the service life of the rotating machine and the bearing.

Description of drawings

FIG. 1 is a partial sectional view of a conventional fan motor, showing its bearing system.

FIG. 2 is a partial sectional view of a fan motor, showing the magnetic bearing system of the first embodiment of the present invention.

3 is a partial cross-sectional view of a fan motor, showing a magnetic bearing system according to a second embodiment of the present invention.

4 is a partial sectional view of a fan motor, showing the magnetic bearing system of another embodiment of the first embodiment of the present invention.

5A is a partial sectional view of a fan motor, showing a magnetic bearing system according to a third embodiment of the present invention.

5B is a partial sectional view of a fan motor, showing the magnetic bearing system of another embodiment of the third embodiment of the present invention.

5C is a partial sectional view of a fan motor, showing the magnetic bearing system of the third embodiment and another embodiment of the present invention.

5D is a partial sectional view of a fan motor, showing the magnetic bearing system of the third embodiment and another embodiment of the present invention.

5E is a partial cross-sectional view of a fan motor, showing the magnetic bearing system of the third embodiment and another embodiment of the present invention.

Symbol Description:

1 fan motor

11 rotors

111 shaft

12 stator seat

121 mandrel hole

13, 14 Ball bearings

15 springs

16C type buckle

2, 3, 4, 4a, 4b Magnetic bearing system

21, 31, 41 rotors

211, 311, 411, 411a, 411b shaft

22, 32, 42 stator seat

221, 321, 421 mandrel hole

23, 24, 33, 34, 43, 44 Magnetic Assembly

231, 232, 233, 241, 242, 243, 331, 332, 333, 334, 341, 342, 343, 344, 431, 432, 433, 434, 441, 442, 443, 444 ring magnet

2311, 2321, 2331, 2411, 2421, 2431, 3311, 3321, 3331, 3341, 3411, 3421, 3431, 3441, 4311, 4321, 4331, 4341, 4411, 4421, 4431, 4441 Heteropolar interface

25 bushing

26, 27, 35 deep groove thrust bearings

28, 36C buckle

29, 37 spacers

100, 200, 300, 400 ring magnet joint surface

45, 45a, 45b, 45c, 45d wear pads

451 plane

451a, 451b, 451c, 451d curved surfaces

412 convex surface

412a plane

412b concave surface

Detailed ways

Please refer to Fig. 2, the magnetic bearing system 2 according to the first embodiment of the present invention is a stacked passive magnetic bearing system, which is composed of two magnetic components 23 and 24 to provide radial support for the bearing The magnetic components 23 and 24 are respectively composed of more than one magnetic ring, and the magnetic components 23 and 24 are respectively arranged on the rotating shaft 211 and the stator base 22 of the magnetic bearing system 2 in a manner of facing each other with the same pole. The magnetic ring is, for example, a ring magnet or a ring permanent magnet. In this embodiment, a ring magnet is taken as an example for description.

Specifically, the magnetic assembly 23 is fixed on the side wall of the rotating shaft 211 of the rotor 21 of a fan motor, and is connected with the same pole by the ring-shaped magnets 231, 232, 233 with opposite polarities at both ends (N pole and N pole). poles are connected and/or S poles are stacked with S poles). Another magnetic component 24 is fixed on the side wall of the spindle hole 221 of the stator base 22 of the fan motor for accommodating the rotating shaft 211 , and is also composed of ring magnets 241 , 242 , 243 stacked in the same polarity. In addition, the ring magnets of the magnetic components 23 and 24 are in one-to-one correspondence, and the magnetic components 23 and 24 are not in contact with each other.

In this embodiment, the heteropolar interface of each ring magnet 231, 232, 233 (that is, the interface between the N pole and the S pole) 2311, 2321, 2331 and the different pole of the corresponding ring magnet 241, 242, 243 The interfaces 2411 , 2421 , 2431 are aligned, and the ring magnet joint surfaces 100 , 200 are also aligned with the corresponding ring magnet joint surfaces 300 , 400 . In other words, the N poles (or S poles) formed by the ring magnets 231 , 232 , 233 and the N poles (or S poles) formed by the corresponding ring magnets 241 , 242 , 243 face each other in front.

In addition, the thicknesses of the ring magnets 231, 232, and 233 of the magnetic assembly 23 of this embodiment can be the same as shown in FIG. The condition that the heteropolar interface 2411 , 2421 , 2431 of the magnet 241 , 242 , 243 is aligned with the heteropolar interface 2311 , 2321 , 2331 of the corresponding ring magnet 231 , 232 , 233 of the magnetic assembly 23 is sufficient. For example, the thickness of each ring magnet of the magnetic assembly 24 is the same as the thickness of the ring magnet of the corresponding magnetic assembly 23. Specifically, the ring magnets 231 and 241, the ring magnets 232 and 242, and the ring magnets 233 and 243 are respectively have the same thickness.

On the other hand, referring to FIG. 4, the thicknesses of the two outermost ring magnets 241 and 243 of the magnetic assembly 24 on the sidewall of the spindle hole 221 can also be slightly increased to become 241a and 243a in FIG. Each of them is larger than the thickness of the corresponding ring magnets 231 and 233 of the magnetic assembly 23 on the side wall of the rotating shaft 211, so as to reduce the load of the assembly (such as the thrust bearing described later) in the axial direction and compensate due to machining. Process and assembly process may produce errors. In this case, the ring magnet engagement surfaces 100, 200 and the corresponding ring magnet engagement surfaces 300, 400 are still aligned.

Therefore, with respect to the embodiment shown in Fig. 2 and Fig. 4, as long as the different pole interface of each ring magnet of the magnetic assembly on the side wall of the rotating shaft and the corresponding ring magnet of the magnetic assembly on the side wall of the spindle hole The interface between different poles can be aligned, or the joint surface of the ring magnet can be aligned with the corresponding joint surface of the ring magnet, and the total thickness and The thicknesses of the ring magnets may be the same or different.

In addition, the magnetic bearing system 2 according to the first embodiment of the present invention also includes a bush 25, two deep groove thrust bearings 26 and 27, a C-shaped buckle 28 and a shim. ) 29, as the axial support assembly of the magnetic bearing system 2.

The lower surface of the deep groove thrust bearing 26 is located on the stator base 22 and the upper surface is adjacent to the bushing 25. The bushing 25 is installed on the rotating shaft 211 and is located between the magnetic assembly 23 and the deep groove thrust bearing 26. The deep groove only The push bearing 26 provides an axial force in the magnetic bearing system 2 to resist the movement of the magnetic shaft 211 toward the stator base 22 and supports the gravity of the rotor 21 , the shaft 211 , the magnetic assembly 23 and the bushing 25 . The deep groove thrust bearing 27 is installed on the stator base 22 , and it provides an axial force in the magnetic bearing system 2 to resist the movement of the rotating shaft 211 away from the stator base 22 . The deep groove thrust bearings 26 and 27 here can be replaced by other bearings having a thrust effect, such as roller thrust bearings.

The C-shaped clasp 28 is installed on the rotating shaft 211 to fix the relative position between the rotating shaft 211 and the spindle hole 221 . The spacer 29 is installed on the rotating shaft 211 and is located between the deep groove thrust bearing 27 and the C-shaped retaining ring 28 to distribute the load evenly. And under the situation that the load force can be evenly distributed, the gasket 29 can also be omitted.

It should also be noted that the upper and lower surfaces of the bushing 25 are respectively adjacent to the magnetic assembly 23 and the deep groove thrust bearing 26, and its function is to block the magnetic attraction force and support between the magnetic assembly 23 and the deep groove thrust bearing 26. Magnetic assembly 23. Because of this, the bushing 25 of the present embodiment can be made of a material with a low magnetic permeability such as gold, copper, silver, carbon, lead or a non-magnetic material and has a certain rigid support element (support element) to replace.

Please refer to FIG. 3 , which is a schematic diagram of a magnetic bearing system 3 according to a second embodiment of the present invention. The difference between this embodiment and the first preferred embodiment lies in the configuration relationship between the magnetic components 33 and 34 and the axial support components. In the following, only the differences between this embodiment and the first embodiment will be described, and the similarities will not be repeated here.

In this embodiment, the magnetic assembly 33 is axially offset by a distance L relative to the magnetic assembly 34 . That is, the different pole interfaces 3311, 3321, 3331, 3341 of the ring magnets 331, 332, 333, 334 of the magnetic assembly 33 on the side wall of the rotating shaft 311 are opposite to the magnetic assembly 34 on the side wall of the spindle hole 321. The heteropolar interfaces 3411, 3421, 3431, 3441 of the annular magnets 341, 342, 343, 344 are offset upward by a distance L, so that the magnetic force of the magnetic components 33 and 34 acts on the magnetic bearing system 3 to provide an upward axis. The force is used to prevent the rotation shaft 311 from moving toward the stator base 32 (downward movement), and to oppose the magnetic attraction force between the magnetic assembly 33 and the deep groove thrust bearing 35 and the gravity of the magnetic assembly 33 .

In addition, the deep groove thrust bearing 35 of this embodiment is installed on the stator base 32 to provide an axial force in the magnetic bearing system 3 to resist the movement of the rotating shaft 311 away from the stator base 32 . The deep groove thrust bearing 35 here can be replaced by other bearings having a thrust effect, such as a roller thrust bearing. It should also be noted that the use of the thrust bearing in this embodiment is related to the arrangement between the magnetic components respectively located on the rotating shaft and the spindle hole. In this embodiment, due to the offset of the magnetic assembly 33 relative to the magnetic assembly 34, the magnetic assembly 33 is relatively upward, so this embodiment must be matched with a thrust bearing 35 whose thrust direction is axially downward to prevent The rotating shaft 311 moves upward in the axial direction when rotating. However, we can also make the magnetic component 34 offset relative to the magnetic component 33 so that the magnetic component 33 is relatively downward, so that the magnetic repulsion formed between the two contributes an axial downward force to prevent the rotating shaft 311 from rotating. To move upward in the axial direction, and further according to the magnetic repulsion between the magnetic components 33 and 34, a thrust bearing that can provide auxiliary thrust is used, such as a thrust bearing whose thrust direction is axially upward.

It should be noted that, as far as the embodiment of FIG. 3 is concerned, as long as the heteropolar interfaces of the magnetic components 33 and 34 have sufficient misalignment in the same direction. Under this condition, the total thickness of the magnetic components 33, 34 or the thickness of each ring magnet can be the same, partly the same or completely different. In addition, the magnetic components 33, 34 can also be composed of at least one ring magnet.

Please refer to FIGS. 5A to 5E , which are schematic diagrams of magnetic bearing systems 4 , 4 a and 4 b according to a third embodiment of the present invention. The difference between this embodiment and the above-mentioned embodiments is that the magnetic component 44 is offset upward by a distance L′ in the axial direction relative to the magnetic component 43, and the end of the rotating shaft is shaped into a convex curved surface 412, a flat surface 412a or a concave surface. Curved surface 412b, and use wear-resistant pads 45, 45a, 45b, 45c, and 45d made of materials with a small friction coefficient to contact the ends of shafts 411, 411a, and 411b to support shafts 411, 411a, and 411b, wherein the wear-resistant pads 45, 45a and 45b support the rotating shaft 411, while wear pads 45c and 45d support the rotating shafts 411a and 411b respectively.

The surfaces of these wear-resistant pads 45, 45a, 45b, 45c and 45d in contact with the ends of the rotating shafts 411, 411a, 411b are respectively designed as a plane 451, a curved surface 451a and 451b with a curvature smaller than that of the convex curved surface 412, a A curved surface 451c whose curvature is larger than that of the plane 412a and a curved surface 451d whose curvature is larger than that of the concave curved surface 412b are used to make the rotating shaft 411, the rotating shaft 411a and the rotating shaft 411b and the wear pads 45, 45a, 45b, 45c And the contact between 45d is a point contact. In addition, the convex curved surface 412, the concave curved surface 412b, the curved surfaces 451a and 451b, the curved surface 451c, and the curved surface 451d are, for example, an arc surface, a conical surface, a paraboloid, or an ellipse.

In the following, only the differences between this embodiment and the above-mentioned embodiments will be described, and the similarities will not be repeated here.

In this embodiment, each magnetic assembly 43 and 44 is formed by stacking ring-shaped magnets 431, 432, 433, 434, 441, 442, 443, 444 with opposite polarities at both ends in a manner connected with the same poles, and the magnetic The ring magnet of the assembly 44 is in one-to-one correspondence with the ring magnet of the magnetic assembly 43, and the magnetic assemblies 43, 44 are not in contact with each other.

In particular, the heteropolar interfaces (that is, the interface between the N pole and the S pole) 4411, 4421, 4431, 4441 of the annular magnets 441, 442, 443, 444 of the magnetic assembly 44 located on the side wall of the spindle hole 421 With respect to the heteropolar interfaces 4311, 4321, 4331, 4341 of the corresponding ring magnets 431, 432, 433, 434 of the magnetic assembly 43 on the side wall of the rotating shaft 411, they are offset upward by a distance L', so that the magnetic assemblies 43 and 44 The magnetic force acts to generate an axial force to resist the movement of the rotating shafts 411, 411a, 411b in the magnetic bearing system 4 away from the stator seat 42, that is, in FIGS. 5A to 5E, the magnetic force acts to provide a downward axial force to prevent The rotating shafts 411, 411a, 411b move upward.

In addition, the wear-resistant pads 45, 45a, 45b, 45c, and 45d of this embodiment are installed at the bottom of the spindle hole 421 of the stator base 42, and are used to carry the rotating shafts 411, 411a, 411b and provide an axial force against the rotating shaft 411. , 411a, 411b move towards the bottom of the stator base 42, and support the gravity of the rotor 41, the rotating shafts 411, 411a, 411b and the magnetic assembly 43. In this way, the axial support components including the deep groove thrust bearings, retaining rings and gaskets in the above embodiments can be further simplified into a wear-resistant pad, while still providing enough space for the rotating shafts 411, 411a, 411b. Axial support, and there is no need to worry about the friction loss of the magnetic bearing system 4, 4a, 4b during operation.

As far as the embodiments in FIGS. 5A to 5E are concerned, it is sufficient as long as the axial misalignment of the heteropolar interfaces of the magnetic components 43 and 44 is sufficient to support the rotating shafts 411 , 411 a , 411 b in the axial direction. Under this condition, the total thickness of the magnetic components 43, 44 or the thickness of each ring magnet can be the same, partially the same or completely different. In addition, the magnetic components 43, 44 can also be composed of at least one ring magnet.

In each of the above-mentioned embodiments, since the magnetic assembly 23, 24 or 33, 34 or 43, 44 is composed of at least one annular magnet with opposite polarities at both ends, an appropriate number of annular magnets can be configured, And let the rotating shaft 211 or 311 or 411, 411a, 411b and the mandrel hole 221 or 321 or 421 can produce enough radial magnetic repulsion to avoid the rotating shaft 211 or 311 or 411, 411a, 411b in the radial direction when rotating Surface contact friction, and balance the deflection generated in the radial direction when the rotating shaft 211 or 311 or 411, 411a, 411b is running. Also, the present invention provides axial force by deep groove thrust bearings 26, 27, 35 or wear pads 45, 45a, 45b, 45c and 45d respectively, so it can reduce or even prevent magnetic bearing system 2 or 3 Or 4, 4a, 4b axial vibration that can occur during operation.

To sum up, the present invention has described various embodiments of the present invention in detail by using the above-mentioned embodiments. However, it should be understood by those skilled in the art that the various embodiments of the present invention are merely illustrative rather than restrictive. Variations and amendments are covered by the present invention, which is defined by the appended claims.

Claims (8)

1. magnetic bearing system comprises:

One rotating shaft, its end is by the moulding surface of contact that becomes;

One arbor hole is positioned on the stator seat, in order to hold this rotating shaft;

One first magnet assembly is fixedly arranged in this rotating shaft;

One second magnet assembly is fixedly arranged on the sidewall of this arbor hole; And

One supporting component, surface thereof is that point contacts with the surface of contact of this rotating shaft, resists this rotating shaft so that an axial force to be provided.

2. magnetic bearing as claimed in claim 1 system, wherein this supporting component is the made wear-resistant pad of material of a low coefficient of friction.

3. magnetic bearing as claimed in claim 1 system, wherein this surface of contact and this surface be selected from by plane, group that arc surface, conical surface, parabola, ellipsoid constituted one of them.

4. magnetic bearing as claimed in claim 1 system, wherein the curvature of this surface of contact is not equal to this surperficial curvature.

5. magnetic bearing as claimed in claim 1 system, wherein this first magnet assembly is made up of the ringshaped magnet that at least one two ends polarity opposite shaft orientation magnetizes.

6. magnetic bearing as claimed in claim 5 system, wherein this second magnet assembly is made up of the ringshaped magnet that at least one two ends polarity opposite shaft orientation magnetizes.

7. magnetic bearing as claimed in claim 6 system, wherein the ringshaped magnet of this first magnet assembly is that homopolarity is relative with the ringshaped magnet of second magnet assembly, and a heteropole separating surface of each ringshaped magnet upwards is offset a distance with respect to a heteropole separating surface of corresponding ringshaped magnet on this first magnet assembly on this second magnet assembly.

8. magnetic bearing as claimed in claim 6 system, the wherein total thickness on this first magnet assembly and this second magnet assembly or respectively thickness of this ringshaped magnet can be identical, part is identical or complete difference.

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