Design of axial bearing with increased active steel fill factor

FIELD: machine building.

SUBSTANCE: design of magnetic axial bearing includes ring system of plates of electric steel, where separate steel plates (80, 90, 170) project radially outside, and neighbouring steel plates (80, 90, 170) in circumferential direction create clearance (20). Device also contains electrical coil inserted in system of electric steel plates to create magnetic field in the system. This system has at least two concentric rings (8, 9, 17) of the electric steel plates. In principle all adjacent electric steel plates (80, 90, 170) of each ring (8, 9, 17) of electric steel plates along the internal perimeter (14, 18, 19) of the appropriate ring of the electric steel plates touch each other. Using this charging (12) an increased active steel fill factor is provided in comparison with the traditional charge (11).

EFFECT: improved efficiency factor of magnetic axial bearing.

10 cl, 5 dwg

 

The present invention relates to the axial bearing device, comprising an electrical steel sheets, which separate the steel sheets are issued radially outward, and an electric coil, which is inserted in a system of electrical steel sheets to create a magnetic field in a system of electrical steel sheets.

Active axial magnetic bearings are used to regulate contactless required distances between two objects. The design principle of the axial bearing of this kind is shown in Fig.1. In this example, the shaft 1 is supported in the axial direction. Steel plate 2 is concentrically attached to the shaft 1. Along with a steel disk 2, the axial bearing system has two annular electromagnets 3, 4 (here also called axial bearing devices, which are arranged on two sides of the steel plate 2 coaxially with him and with the shaft 1. While the electromagnets 3 and 4 are static and, for example, is fixed on the housing of the electric machine, a shaft, including a steel disk 2 rotates within the two electromagnets 3, 4.

The electromagnets 3, 4 are efforts on soft magnetic materials, such as steel disc 2. When properly configured, the electromagnets 3, 4 steel disc 2 contactless can be retained in a predetermined axial position between �electromagnetisme 3 and 4.

The electromagnets 3, 4 are, as a rule, are built with circular coils, which are located in the groove in the steel stator. Most often, the stator is made of steel massive. In massive steel stator field changes lead to vortex currents, which, in turn, create a counter rotating field. Worsens the ability to control magnetic bearings.

Eddy currents are reduced in a known manner by blending the steel of the stator pack. The blending of stators of axial bearings is known from the publication DE 69103756 T2. There is described the components of the stator and rotor magnetic thrust bearing with a correspondingly laminated construction. The leaves of the slats are curved so that their vertices lie in a common cylindrical plane. In addition, touching the side edges of the steel sheets of the slats are in common planes that are perpendicular to the axis of rotation.

From EP 0795881 A1 is known an electromagnetic device for pump for fuel injection. The stator of the electromagnetic device includes a plurality of electrical steel sheets, which are arranged around a Central spiral axis of the stator.

The object of the present invention is to improve the efficiency of the device for a magnetic axial bearing.

In accordance with the USA�AI with the invention this task is solved by a device of a magnetic axial bearing, includes

- ring system electrical steel sheets, which separate the steel sheets are issued radially outward, and the adjacent steel sheets in the circumferential direction to form a gap, and

- electric coil, which is inserted in a system of electrical steel sheets to create a magnetic field in a system of electrical steel sheets,

- system of electrical steel sheets has at least two concentric ring electrical steel sheets and

- essentially all of the adjacent plates of each ring electrical steel sheets at the inner perimeter of the respective rings of electrical steel sheets touch each other.

Ring system electrical steel sheets of the known design has the steel sheets, which are distributed continuously from the inner perimeter to the outer perimeter of the electrical steel sheets. Since the electrical steel sheets have the same width everywhere and on the inner perimeter adjacent to each other, on the outer perimeter are obtained correspondingly large gaps between adjacent sheets. Because of this, the fill factor of the active steel ring system electrical steel sheets of this kind are not very high. Therefore, the preferred way according�accordance with the present invention, the system of electrical steel sheets separated by at least two concentric rings of electrical steel sheets. The electrical steel sheets are distributed each ring of the electrical steel sheets is always from the inner perimeter to the outer perimeter. Because now the electrical steel sheets even outside of the at least two rings of electrical steel sheets are adjacent to each other on its inner perimeter, can achieve higher fill factor active steel, since the traditional system of electrical steel sheets single sheets of electrical steel in radial height substantially removed from the inner perimeter of the outer ring of the electrical steel sheets of the inventive system.

Preferably, the system of electrical steel sheets has three concentric rings of electrical steel sheets, the average of the rings electrical steel sheets forms a recess in which is inserted an electric coil. It is particularly preferable when the average ring electrical steel sheets has the same radial width as the inserted electrical coil. The manufacture of the device axial bearing is structurally simple.

In addition, the average ring electrical steel sheets can be is an opening in the axial direction to carry out�Oia cables to the electric coil. This has the advantage that the connecting wire for electrical coils can be output to the outside by the shortest route, while the magnetic circuit is disturbed only minimally.

In one of preferred embodiments the system of electrical steel sheets arranged in an annular pocket. Pocket stabilizes the system electrical steel sheets in two radial directions and in one axial direction.

System electrical steel sheets can be held in a pocket by one or more retaining rings. Thanks to this system of electrical steel sheets are also recorded relatively open side pockets.

When the retaining ring in cross section is T-shaped, it can keep in the pocket of the inner and outer ring of electrical steel sheets in the axial direction with geometric circuit. With only one retaining ring is fixed in the axial direction of the two rings of electrical steel sheets.

In addition, the average ring electrical steel sheets can be held in a pocket of the inner and outer ring of electrical steel sheets with geometric circuit. All of the electrical steel sheets, which here consists of three to�LEC electrical steel sheets, can be fixed in a pocket of a single ring, which, as mentioned above, for example, is T-shaped.

According to another preferred embodiment of the cavity between the steel sheets of the system of electrical steel sheets filled with resin. This stabilizes the individual sheets of steel between them and the whole system of electrical steel sheets and simultaneously provides the necessary electrical isolation.

Particularly preferably, the electrical machine can be equipped with an axial bearing device of this kind. Magnetic axial bearing ensures minimal friction losses.

Now the present invention is explained in more detail using the accompanying drawings on which is shown:

Fig.1: axial bearing according to the prior art;

Fig.2: top view of a fragment of the electromagnet of Fig.1;

Fig.3: top view of the system of electrical steel sheets of the annular electromagnet;

Fig.4: an enlarged view of a fragment of Fig.3 and

Fig.5: cross sectional view of the electromagnet of Fig.2 without coil.

Described in more detail below examples of the implementation are the preferred embodiments of implementing the present invention.

For example, a generator or other electrical machine has an axial bearing, as principally shown in Fig.1. E�ectromagnetic 3 and 4, axial bearing, i.e. the axial bearing system, the present invention have a structure which is described below in detail. This design is simple and results in high fill factor active steel and durable pair.

Fig.2 shows a top view of a fragment of one of the electromagnets 3, 4 (unit axial bearing). The electromagnet 3, 4 has an annular pocket 5, which in Fig.2 are only visible concentric walls 6, 7.

Ring 5 pocket filled with laminated inner ring 8 and the laminated outer ring 9. Between the two rings is an annular coil 10. As will be explained in connection with Fig.5, the inner ring 8 together with the outer ring 9 and the middle ring under the coil form 10 annular groove into which is inserted an annular coil 10.

Fig.3 are shown, the present invention view of the blending of the annular magnet. In the upper half of Fig.3 one can see traditional blending 11. In the bottom half of the laminated rings, by contrast, shows the proposed invention the blending 12.

Fig.4 shows an enlarged fragment of the ring of Fig.3. There is better you can see the differences between the traditional blending 11 and the present invention by blending 12. For sitovo apply conventional electrical steel sheets. They are everywhere the same thickness.

When traditional Chikh�Ofce 11, as with the present invention, the blending 12, single sheets of steel radial issued out. It is always star-shaped system of electrical steel sheets. In order to clarify the entire ring system of the electrical steel sheets is depicted with two different shahtovymi 11 and 12. In practice, of course, the system of electrical steel sheets will have only one of these two satovic around the perimeter.

Traditional blending 11 each steel sheet 13 in the radial direction is issued from the inner perimeter 14 to the outer perimeter 15. As individual sheets 13 steel on the inner perimeter 14 directly touch each other, due to the slotted design on the outer perimeter 15 between adjacent sheets 13 were always relatively large gap 16. The fill factor active laminated steel thus rings low, respectively.

In the present invention, the blending 12 includes at least two concentric rings of electrical steel sheets in the present example, three rings of electrical steel sheets, namely the inner ring 8 sheets of electrical steel, the outer ring 9 of the electrical steel sheets and located between the ring 17 of the electrical steel sheets. On the CX�may be put at risk Fig.3 and Fig.4 individual rings 8, 9 and 17 of the electrical steel sheets are always the same radial thickness. However, as can be seen from Fig.2, the radial thickness of the individual rings may be different. In particular, they can, as also explained in connection with Fig.5, also radially to go at each other.

The lower half of Fig.4 explains that the individual sheets 80, 90, and 170 are radially shorter than the leaves 13 steel blending traditional 11. Leaves 80 steel inner ring 8 of the electrical steel sheets is also not made integrally with the sheets 90 and 170 steel outer ring 9 of the electrical steel sheets and the middle of the ring 17 of the electrical steel sheets. Also the 90 sheets were not made integrally with 170 sheets of steel. Now this has the advantage that the individual sheets 80, 90, and 170 become each of the rings 8, 9 and 17 of the electrical steel sheets corresponding to the inner perimeter or, respectively, the inner radius 14, 18, 19 can touch each other. In this case, the fill factor of the active steel on the inner perimeter 14, 18, 19 always 100%, and it decreases corresponding to the outer perimeter of the respective rings 8, 9, 17 electrical steel sheets. As individual sheets 80, 90, 170 steel, however, does not extend from the inner perimeter 14 of the inner ring 8 of the electrical steel sheets to the outer peri�of ETP 15 of the outer ring 9 of the electrical steel sheets, the gap 20 between, for example, adjacent sheets 90 in the circumferential direction is significantly smaller than the corresponding gap 16 in the traditional blending 11. The reason for this is that the outer ring 9 of the electrical steel sheets has substantially more sheets 90 steel than the average ring 17 of the electrical steel sheets. This ring, in turn, has significantly more leaves 170 steel than the inner ring 8 of the electrical steel sheets. The inner ring 8 of the electrical steel sheets has the same number of sheets 80 steel, and electrical steel sheets with traditional blending 11.

With the help of three concentric rings 8, 9 and 17 of the electrical steel sheets is achieved a significantly higher fill factor active steel than traditional blending 11. The achieved axial force proportional to the fill factor of the active steel. Increasing effort is determined from the relationship of the fill factor of the active steel. For the system of electrical steel sheets, which includes only one ring, it turns out the coefficient f1 fill the active steel. The system of electrical steel sheets comprising three concentric rings of electrical steel sheets of the same radial thickness, f3 is obtained, the fill factor �active steel. Then the corresponding relation of the fill factor of the active steel of the following: f3/f1=1+s/(3ri), where s corresponds to the radial thickness, and rithe inner radius of the system of electrical steel sheets. In this case, when the characteristic sizes of electromagnets or, respectively, devices axial bearing out the importance of increasing efforts from 10% to 20%.

Fig.5 shows a fragment of the cross section of the proposed invention the device for axial bearing. In particular, in the cross section is clearly visible U-shaped pocket 5 with its outer wall 6 and inner wall 7. To the inner wall 7 adjacent laminated inner ring 8. To the outer wall 6 adjacent the laminated outer ring 9. Between the two rings 8 and 9 of the electrical steel sheets is the average ring 17 of the electrical steel sheets. The blending of separate rings 8, 9, 17 in Fig.5 is not visible.

Both rings 8, 9 electrical steel sheets are distributed in the axial direction 21 from the bottom 22 of the annular pocket 5 to the upper edges of the walls 6, 7. Medium ring 17 electrical steel sheets, by contrast, extends in the axial direction 21 is much less far. Due to this, in the axial direction over the middle ring 17 electrical steel sheets and between the outer ring 9 sheets electrical engineering�detailed technical steel and inner ring 8 of the electrical steel sheets is formed a groove 23 to the annular coil 10. However, in the drawing of Fig.5, this groove is not shown.

In the axial direction under the middle ring 17 electrical steel sheets here is the retaining ring 24. This ring has a T-shaped cross-section and is secured by screws 25 to the bottom 22 of the annular pocket 5. Radially spaced shoulders T-shaped in cross section retaining rings 24 are capturing the shelves 26 and 27 of the inner ring 8 of the electrical steel sheets and the outer ring 9 of the electrical steel sheets. Both rings 8, 9 electrical steel sheets are fixed in the pocket 5.

Both rings 8, 9 electrical steel sheets have, in addition, passing in the circumferential direction grooves 28, 29 in which the protrusions protrude middle of the ring 17 of the electrical steel sheets. In addition, the average ring 17 of the electrical steel sheets with geometric circuit (in the axial direction 21) is held between the inner ring 8 of the electrical steel sheets and outer ring 9 of the electrical steel sheets. Thus, by using a single retaining ring 24 these three rings 8, 9 and 17 can stay in the pocket 5. But in principle, can also be provided several retaining rings for attaching rings of electrical steel sheets.

Although the examples above are carried out with three concentric� rings of electrical steel sheets system electrical steel sheets may also consist of two concentric rings of electrical steel sheets or four rings of electrical steel sheets. When two rings of electrical steel sheets then, for example, one half is shown in Fig.5 middle ring electrical steel sheets would be connected integrally with the outer ring of electrical steel sheets, and the other half integrally with the inner ring of the electrical steel sheets.

For the annular coil 10 need carts cables. To this end, in the axial direction can be provided with corresponding openings or, respectively, the conclusions of the cables in the system of electrical steel sheets, and the pocket 5. In the example of Fig.5 pocket 5 in its bottom 22 has a hole 30. Since the system of electrical steel sheets here has three rings of electrical steel sheets, medium ring 17 electrical steel sheets can simply be interrupted at the place corresponding to the axial hole 30. Also there would have to be aborted, the retaining ring 24, which also can be seen in Fig.5. The inner and outer rings 8, 9 sheets of electrical steel, by contrast, remain closed. Solid blending here show other disadvantages compared to the composition of the�Noah, because the blending should be interrupted at the output of the cable so that the respective sheets can no longer be given out. Otherwise, there are significant additional processing costs to create the holes for the connecting wires.

To increase the mechanical strength of the cavity between sheets rings sheets of electrical steel may be filled with resin.

The preferred image of the present invention performs the function of a stator axial bearing device has in comparison with known devices high-fill factor active steel, which leads to a correspondingly higher force per unit area. Concentric system, including several rings, leads, in addition, to sturdy design that can be manufactured cost-effectively.

1. The device (34) of the magnetic axial bearing, which includes
- ring system electrical steel sheets, which separate the sheets (80, 90, 170) were issued radially outward and adjacent sheets (80, 90, 170) steel in the circumferential direction to form a gap (20), and
- an electric coil (10) which is inserted in a system of electrical steel sheets to create a magnetic field in a system of electrical steel sheets,
characterized in that
system l�ists electrical steel has at least two concentric rings (8, 9, 17) electrical steel sheets and
- essentially all of the adjacent sheets (80, 90, 170) each steel rings (8, 9, 17) electrical steel sheets at the inner perimeter of each ring (8, 9, 17) electrical steel sheets touch each other.

2. The magnetic axial bearing according to claim 1, wherein the system electrical steel sheets has three concentric rings (8, 9, 17) electrical steel sheets, the average of the rings electrical steel sheets forms a recess (23) is inserted into the electrical coil (10).

3. The magnetic axial bearing according to claim 2, wherein in the middle ring (17) electrical steel sheets is an opening in the axial direction for holding the cables to the electric coil (10).

4. The magnetic axial bearing according to one of claims.1-3, and the system of electrical steel sheets arranged in an annular pocket (5).

5. The magnetic axial bearing according to claim 4, wherein the system electrical steel sheets is held in a pocket (5) at least one retaining ring (24).

6. The magnetic axial bearing according to claim 2, wherein the system electrical steel sheets is held in a pocket (5) at least one retaining ring (24), wherein the specified at least one abstain�ing ring (24) in cross section is T-shaped and holds in the pocket (5) internal and the outer ring (8, 9) electrical steel sheets in the axial direction (21) with geometric circuit.

7. The magnetic axial bearing according to claim 6, wherein the secondary ring (17) electrical steel sheets is held in a pocket (5) inner and outer ring (8, 9) electrical steel sheets with geometric circuit.

8. The magnetic axial bearing according to one of claims.1-3, 5-7, and the cavity between the sheets (80, 90, 170) steel system electrical steel sheets filled with resin.

9. The magnetic axial bearing according to claim 4, wherein the cavity between the sheets (80, 90, 170) steel system electrical steel sheets filled with resin.

10. Electric machine equipped with a device (3, 4) axial bearing according to one of claims.1-9.



 

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4 dwg

FIELD: machine building.

SUBSTANCE: magnetic bearing assembly contains casing (1), in which magnetic thrust and radial bearings are installed. Rotation axis of the rotor (7) is oriented vertically. Thrust bearing block is installed under thrust journal (8), at that the journal (8) contains cylindrical groove (12), on its bottom the composite permanent magnet (3) is installed, as minimum it contains three ring coaxial permanent magnets, odd magnets starting from the outermost are magnetised radially and look each other by like poles, and even magnets are made with axial magnetising. The ring permanent magnet (2) secured in the casing (1) is made similarly. The rotor top part (7) projecting above the journal (8) has the sleeve shape (6), and central part of the cover (5) is equipped with cylindrical projection (13) made with the possibility of insertion in the cavity of the rotor top part (7). On the internal surface of the sleeve (6) minimum three ring permanent magnets (9) of the radial bearing are rigidly secured above each other. On the surface of the cylindrical projection (13) of the cover (5) looking on the cavity surface of the rotor top part (7) minimum three ring permanent magnets (11) of the radial bearing are rigidly secured above each other, in terms of dimensions and direction of intensity of magnetisation are similar to those of the secured on the internal surface of the sleeve (6), but shifted relatively to them through vertical. The external surface of the sleeve (6) and cylindrical edge of the journal (8) are provided with bandage (14, 15) made by coiled high strength fibres on the binding agent out of solidified synthetic resin. The journal (8) and rotor (7) are hollow and are mainly equipped with the radial reinforcement ribs (16, 17).

EFFECT: assurance of high carrying capacity of thrust and radial bearing assemblies under operation mode with reduced friction losses, improved operation reliability, improvement of mechanical efficiency of the turbine generator.

2 cl, 4 dwg

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