Rotating electrical machine, namely asynchronous electrical machine of double-way feed in power range of 20 mv a to 500 mv a and higher

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering and can be used in a rotating electrical machine, and namely an asynchronous electrical machine of double-way feed in the power range of 20 MV·A to 500 MV·A. The asynchronous electrical machine of double-way feed includes a rotor rotated about the axis and concentrically enveloped by a stator; the stator includes rotor pack (14) assembled of metal sheets divided into layers and pressed in axial direction for attachment; the above rotor pack is divided in radial direction into internal mechanical zone (14b) and external electrical zone (14a), and in which rotor winding (18) is located in electrical zone (14a). Axial clamping of the pack of rotor sheets of such a machine is optimised by the fact that rotor sheet pack (14) in mechanical zone (14b) is pressed by means of shear bolts (22) going in axial direction through rotor sheet pack (14) and in electrical zone (14a) - by means of other bolts (21).

EFFECT: providing protection of insulation against damages.

13 cl, 10 dwg

 

The present invention relates to the field of power generation. The invention relates to a rotating electrical machine, in particular an asynchronous electric machine dual power supply in the power range from 20 MVA to 500 MVA and more in accordance with the restrictive part of paragraph 1 of the claims.

The level of technology

Asynchronous machine dual power supply in the power range from 20 MVA to 500 MVA and more can be used for energy generation with variable rotor speed. These machines differ distributed three-phase winding on the rotor. The rotor winding consists of individual rods, which are stacked in the package leaves the rotor in the grooves. In the frontal part winding separate the rods are connected to the winding. Supply current is carried by at least three contact rings on the end of the machine mounted on the shaft. A section of such a machine in a highly simplified form shown in Fig.1. Presented on Fig.1 asynchronous machine 10 contains the axis 13 of the machine. Around this axis 13 rotates the Central package 11 with the shaft, on which are the contact ring 12. Around the Central package 11 is a package of 14 sheets of the rotor, to which under the frontal part winding 16 of the rotor is attached auxiliary rim 20 of the rotor. Around the package 14 sheets of the rotor is concentric PA is no 15 sheets of the stator, hosting the stator winding, which at the end of the batch with the frontal part of the stator winding 17 protrudes outward. Package 14 sheets of the rotor in the enlarged section shown in Fig.2.

Since the rotor of the asynchronous machine dual power supply are winding 18 of the rotor, it must be protected against centrifugal forces. The package leaves the rotor serves, on the one hand, for the perception of these forces and simultaneously determines the direction of the magnetic flux. Auxiliary rim 20 of the rotor is used for the perception of the centrifugal forces that act on the frontal part winding 16 of the rotor. Auxiliary rim 20 of the rotor, as well as a package of 14 sheets of the rotor consists of stacked layers of sheet metal, which compounds are pressed in the axial direction. It is known the use of the push plates 19, which distributes created by the bolts 21, 22, the pressing force on the sheet metal package of the rotor (see, for example, DE-A1-19513457 or DE-A1-10 2007 000668).

To the package 14 sheets rotor has different requirements. In Fig.2 shows the separation on electric area 14a and mechanical area 14b. On the one hand, the teeth should be of sufficient axial pressure between the layers of sheet metal, to ensure the homogeneity of the package. To prevent vibrations layers must not be opened, that is how the relative motion between the teeth and the winding 18 of the rotor could damage insulation. On the other hand, the pressure should not be too large, to prevent damage to the insulation layers between the individual metal sheets, since such damage would lead to increased losses. In the mechanical area 14b of the rim of the rotor axial pressure must be greater than the electrical area 14a to obtain a frictional force between sheets of metal.

Description of the invention

Therefore the task of the invention is to provide such electrical machines mentioned at the beginning of the form, which is considerably better than can be done in different requirements for the clip package leaves the rotor in different zones.

The problem is solved by a set of characteristics paragraph 1 of the claims. For decisions in accordance with the invention it is important that the package (14) leaves the rotor in mechanical area compacted by running in the axial direction through the package leaves the rotor shear bolts and electrical zone by other bolts.

According to a variant implementation of the invention other bolts can be made in the form of running in the axial direction through the package leaves the rotor coupling bolts.

Another example embodiment of the invention differs in that the distribution of axial force pressing on the package leaves the rotor at the ends of the package are provided respectively push plate, and that on the other bolts made in the form of pressing out against the pressure plate clamping bolts.

If, in particular, outside of the pressure plates is supporting rim of the rotor to support the frontal part winding rotor, clamping bolts preferably can be placed in the supporting rim of the rotor.

The following variant embodiment of the invention differs in that at least part of the shear bolts made in the form of solid bolts.

However, it is acceptable and preferable with regard to the use of different materials, if at least part of the shear bolts made in the form of a compound of bolts that contain the outer tube and passing through the Central tube pinch bolt.

In particular, in this case the outer tube in the axial direction can be divided into several parts to better comply with the required tolerances and to facilitate Assembly and installation of the machine.

While it is preferable if the links at the ends equipped with suitable together with means for mounting parts concentric with each other.

Another variant embodiment of the invention differs in that the push plate is divided in the radial direction in accordance with a radial division of the package of sheets of the rotor to separate internal and private exterior pressure plates, and inner and outer pressure plates have each other detachable connection.

Universes the existence of this variant embodiment of the invention differs that the outer cover plate is divided circumferentially into separate equal parts of the circle that the portions of the outer circumference of the pressure plate with straight edge rotation adjacent to the inner pressure plate, and the portions of the outer circumference of the pressure plate is embedded in the inner gland plate by Molotov (with split).

A brief explanation of the figures

Below the invention is explained in more detail by means of embodiments in conjunction with the figures of the drawings. Shown

Fig.1 in a greatly simplified form the incision asynchronous machine in the form in which it is suitable for use in the invention;

Fig.2 in enlarged section the design of the package of sheets of the rotor of the machine from Fig.1, including used to clamp the package of sheets of the rotor gland plate with different bolts in accordance with the embodiment of the invention;

Fig.3 two detailed Fig.3 (a) and 3 (b) two different types of bolts for electric zone package leaves the rotor;

Fig.4 the basic design of composite shear bolt;

Fig.5 at different Fig. 5 (a) to 5 (d) different types of installation tools links shear bolt is concentric with the split tube; and

Fig.6 in the top view in the axial direction sector of the pressure plate to clamp the package of sheets of the rotor in accordance with another is an example embodiment of the invention.

Ways of carrying out the invention

In accordance with Fig.2 for the axial clamping of the package 14 sheets of the rotor are different types of bolts, namely shear bolts 22 and the clamping bolts 21.

Shear and coupling bolts 22 and 21, respectively, are used to create the desired pressure in the package 14 sheets of the rotor. To create pressure in the zone of the tooth or electric zone 14a, can be used in two basic principles.

Coupling bolts:

Coupling bolts (21 in Fig.2 and Fig.3 (a)) pass through the entire axial length of the package 14 sheets of the rotor. Since the clamping bolts 21 are in an active magnetic part (high magnetic induction) package of sheets, they must be electrically isolated. To prevent mechanical stress isolation these bolts should not work on the cut. Through the tension in the clamping bolt 21 can be "regulated" pressure on a pressure plate 19 and with it the pressure in the teeth (see 29 in Fig.6).

Clamping bolts in the supporting rim 20 of the rotor:

Clamping bolts 23 in the supporting rim 20 of the rotor can be used instead of the one-piece clamping screws 21 (see Fig.3 (b)). If the clamping bolt 23 is used in the supporting rim 20 of the rotor, there is a transfer of pressure to the zone of the tooth package leaves the rotor through bolt, which is located in the auxiliary rim 20 of the rotor. However, the clamping bolt 23 and click the my plate 19 are clamping plate 25 and the nut 24. Through the depth of screwing of the clamping bolt 23 and the nut 24 can be "regulated" pressure on a pressure plate 19 and, consequently, on the teeth.

Shear bolts 22 performs, on the contrary, two tasks: on the one hand, they serve to create an axial pressure in the mechanical area 14b of the package 14 sheets of the rotor. On the other hand, they must perceive arise between the metal sheets of the package 14 of the rotor efforts slice. For this reason, shear bolts 22 cannot be isolated and are under way on the inside edge, weak magnetic portion 14b mechanical zones.

Passed the efforts of cut determine the material properties and the (outer) diameter shear bolts 22. Axial pressure in the package 14 sheets of the rotor is regulated by extension bolts. To ensure sufficient residual pressure in the package 14 sheets of the rotor, despite the shrinkage of the package 14 sheets of the rotor requires some minimum elongation in the initial state. Large diameters of bolts it can lead to too high pressure.

Therefore, preferably, according to Fig.4, instead of the one-piece bolts to use thick-walled tube 27 with a Central clamping bolts 26, which pass into the bore of the tube 27. Passed the efforts of the cut determines the properties of the material and the diameters of the tubes. While efforts slice perceive tube 7. Final pressure on the package leaves the rotor is regulated through the elongation of the Central clamping bolts 26. Since the diameters of these tubes is less than the whole of the bolts, at the same elongation can be achieved rather more pressure.

A lack of solutions with tubes 27 and a Central tie bolt 26 is in a high precision requirement of the holes in the tubes 27. In particular, the longer the machines are very expensive is to achieve the necessary tight tolerances. However, the same idea can be implemented with a split in the axial direction of the tubes 27. When this tube 27 is divided into several parts (27A in Fig.5), which is much easier can be manufactured with the required tolerances. In addition, this embodiment of the invention facilitates Assembly and installation of the machine. For a simple way to separate the parts 27A to locate each other on a circle, all in accordance with Fig.5 can be provided with threads (Fig.5 (d), move (Fig.5 (C)) or sostrates (Fig.5 (b), or to narrow the cone (Fig.5 (a)), and also possibly a combination of these solutions.

Conflicting requirements for electrical and mechanical areas 14a and 14b, respectively, of the package 15 sheets of the stator even better you can perform by using the design of the bolts through the split in the radial direction y is me plate 19. In Fig.6 in the top view in the axial direction presents a schematic representation of the version of the pressure plate 19. Push plate 19 is divided in the radial direction and partially in the direction of the circumference on a separate internal gland plate 19a and a separate outer gland plate 19b. For its part, the outer cover plate 19b are separated in the direction of the circumference on separate sections of a circle. By following separation of the pressure plate 19 on the interior and a few exterior parts 19a and 19b, respectively, dividing the package 14 sheets of the rotor on the mechanical area 14b and electric zone 14a way axial clamp can be optimized separately for different areas of the package 14 sheets of the rotor.

To attain the targeted tilt of the outer pressure plate 19b separation between the outer and inner clutch plate 19a and 19b, respectively, must contain straight on separate sections of the rib 28 of the rotation. By separating the radial direction of the pressure plate 19 can be achieved in different pressure in electrical and mechanical areas 14a and 14b, respectively, of the package 14 sheets of the rotor.

The LIST of ITEMS

10 asynchronous electric machine

11 Central package (with shaft)

12 contact ring

13 axis

14 package sheets rotor

14a electric area

14b mechanical area

15 the package leaves the stator

16 frontal part winding rotor

17 the frontal part of the stator winding

18, the rotor winding

19 push plate

19a inner cover plate

19b of the outer cover plate

20 auxiliary rim of the rotor

21 pinch bolt

22 shear bolt

23 the clamping bolt

24 nut

25 clamping plate

26 Central stud

27 tube

27A link

28 edge rotation

29 tooth

1. Rotating electrical machine, in particular an asynchronous electric machine (10) dual-supply power range from 20 MVA to 500 MVA or more, which contains rotating around an axis (13) concentrically surrounded by a stator (15, 17) of the rotor (11, 14), the rotor (11, 14) contains collected from sliced and pressed in the axial direction to connect the sheet metal package (14) of the rotor, which in the radial direction is divided into an inner mechanical area (14b) and the external electric zone (14a)and where in the electric zone (14a) is the winding (18) of the rotor, characterized in that the package (14) leaves the rotor in the mechanical area (14b) is compressed by passing in the axial direction through the package (14) leaves the rotor shear bolts (22) and in the electric zone (14a) through other bolts (21 or 23).

2. Masha is as under item 1, characterized in that the other bolts made in the form of coming in the axial direction through the package (14) leaves the rotor coupling bolts (21).

3. Machine under item 1, characterized in that the distribution of axial force pressing on the package (14) leaves the rotor at the ends of the package are provided respectively cover plate (19), and other bolts made in the form of pressing out against the pressure plate (19) of the clamping bolts (23).

4. Machine under item 3, characterized in that
outside of the pressure plate (19) is an auxiliary rim (20) of the rotor to support the frontal portion (16) of the rotor winding and clamping bolts (23) is placed in the supporting rim (20) of the rotor.

5. Machine according to any one of paragraphs.1-4, characterized in that at least part of the shear bolts (22) are designed as one-piece bolts.

6. Machine according to any one of paragraphs.1-4, characterized in that at least part of the shear bolts (22) made in the form of a compound of bolts that contain the outer tube (27) and passing through the tube (27) of the Central tie bolt (26).

7. Machine under item 6, characterized in that the outer tube (27) in the axial direction is divided into several parts (27A).

8. Machine under item 7, characterized in that the links (27A) at the ends equipped with suitable together with means for mounting parts concentric with each other.

9. Machine according to any one of paragraphs.1-4, 7, 8, characterized in that the cover plate (19) is divided in the radial direction in accordance with a radial division of the package (14) leaves the rotor to separate the inner gland plate (19a) and a separate outer gland plate (19b), and the inner and outer pressure plates (19a and 19b, respectively) have with each other detachable connection.

10. Machine under item 5, characterized in that the cover plate (19) is divided in the radial direction in accordance with a radial division of the package (14) leaves the rotor to separate the inner gland plate (19a) and a separate outer gland plate (19b), and the inner and outer pressure plates (19a and 19b, respectively) have with each other detachable connection.

11. Machine under item 6, characterized in that the cover plate (19) is divided in the radial direction in accordance with a radial division of the package (14) leaves the rotor to separate the inner gland plate (19a) and a separate outer gland plate (19b), and the inner and outer pressure plates (19a and 19b, respectively) have with each other detachable connection.

12. Machine under item 9, characterized in that the outer cover plate (19b) is divided circumferentially into separate equal parts of the circle, and the portions of the outer circumference of the pressure plate (19b) with a straight edge (28) of rotation adjacent to the inner pressure plate (19a).

13. Machine under item 10 or 11, characterized in that the outer cover plate (19b) is divided circumferentially into separate equal parts of the circle, and the portions of the outer circumference of the pressure plate (19b) directly with inanim edge (28) of rotation adjacent to the inner pressure plate (19a).



 

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