Pole winding support of an electric machine

Abstract

A pole winding support (1) of an electric machine, having pole winding support screws (2,3,4) and a securing means (5, 6) for at least one pole winding support screw (2, 3, 4), has a fixedly positioned securing means (5, 6) for a pole winding support screw (2, 3, 4). According to a method for securing a pole winding support screw (2, 3, 4) of a pole winding support of an electric machine, pole winding support screws (2, 3, 4) are secured in a position specified by a securing means (5, 6) depending on a contour of the securing means (5, 6) for the pole winding support screws (2, 3, 4).

Description

[0001] Description

[0002] Pole winding support of an electrical machine

[0003] The invention relates to a pole winding support of an electrical machine. For pole windings in, for example, a salient-pole machine, pole winding supports are to be provided, particularly for higher power ratings. In the case of long rotors, several such supports can be arranged side by side. The pole winding supports have pole winding support screws. The pole winding support screws must be secured. This securing mechanism prevents, in particular, the pole winding support screws from becoming loose.

[0004] An object of the present invention is to provide a method for securing the pole winding support screws. A particularly advantageous feature is a simple and injury-free method of securing the pole winding support screws against loosening and / or twisting. This particularly applies to non-preloaded pole winding support screws.

[0005] A solution to this problem is provided by a pole winding support according to claim 1 or by a method for securing a pole winding support screw according to claim 8. Embodiments of these solutions are provided in particular in accordance with claims 2 to 7, 9 and 10.

[0006] The pole winding supports of an electrical machine, in particular a salient pole machine, can have a slotted locking plate to secure the pole winding support screws. After the pole winding support screws have been tightened by hand with a tightening torque of, for example, 400 Nm for M36 screws and a tightening torque of, for example, 500 Nm for M42 screws, and after the rotor has been spun, the corners of the locking plate are turned over with a hammer. This can result in injuries, for example to a hand, or damage to an adjacent component if the tool slips. The invention relates to a pole winding support of an electrical machine, as well as to the electrical machine itself and a method for producing the electrical machine and a method for securing a pole winding support screw of an electrical machine. The electrical machine is, in particular, a salient pole machine.

[0007] A pole winding support of an electrical machine has pole winding support screws. The pole winding support screws are screwed (screwed) into a shaft of the electrical machine via a support. The pole winding support has a lock for at least one pole winding support screw, the lock being firmly connected to the support and / or an intermediate element. The intermediate element is held on the support, for example, by the pole winding support screws. The support has, in particular, at least one lead-through for the pole winding support screw or screws to be passed through, in order to be able to screw them to the shaft. The fixed connection for fixing the lock is, for example, a screw connection or a welded connection. For the screw connection between the lock and the support, in particular at least two screws are used.If the fuse can be supported, only a single screw can be used, since the element against which the fuse rests serves as a torque support. Non-preloaded pole winding support screws are particularly used as pole winding support screws. During the manufacture of the electrical machine or the pole winding support, the fuse for the pole winding support screws is only attached once the pole winding support screws have already been tightened.

[0008] In one embodiment of the pole winding support, an intermediate element, such as a flat sheet metal, is located between the fuse and the support. In particular, this intermediate element is also located between the screw head of the pole winding support screw and the support, which receives the pole winding support screw. The fuse is, in particular, screwed to the intermediate element, which is made of sheet metal. The support is made of aluminum, for example.

[0009] In one embodiment of the pole winding support, the fuse is screwed to the intermediate element. The fuse is, for example, a metal plate (a sheet) with one or more holes. Screws can be passed through the holes to connect the fuse to the support and / or the intermediate element via a screw connection. The intermediate element is held on the support, for example, by the pole winding support screws.

[0010] In one embodiment of the pole winding support, the fuse is welded to the intermediate element and / or the support. This creates a non-detachable connection.

[0011] In one embodiment of the pole winding support, a locking device secures at least two pole winding support screws. For this purpose, the locking device is positioned, for example, between two pole winding support screws.

[0012] In one embodiment of the pole winding support, the locking device has a contour which corresponds to the contour of the head of the pole winding support screw. The pole winding support screw can therefore rest on the locking device and is thus protected against twisting or unscrewing. The pole winding support screws are secured by the locking device in particular by a positive connection between the locking device and the pole winding support screw or pole winding support screws. This is achieved, for example, by a corresponding contour of the locking device, i.e. a shape of the locking device and a shape or contour of the head of the pole winding support screw or pole winding support screws. The contour of the locking device and the contour of the associated pole winding support screw to be secured correspond.Contour matching specifically means that the contours of two parts that are to be joined or that support each other match. Contour matching can ensure that the parts are correctly aligned and support each other. Contour matching can be achieved by a fit, in which the contours of the two parts are shaped to fit into or against each other.

[0013] In one embodiment of the pole winding support, the fuse is arranged between two pole winding support screws.

[0014] In this way, a first and a second pole winding support screw can be secured with just one lock.

[0015] In one embodiment of the pole winding support, the pole winding support screw is secured in a predetermined position depending on the contour of the head of the pole winding support screw. The head of the pole winding support screw has, for example, a hexagonal cross-section, i.e., a contour with six corners. The securing device has a corresponding angle or notch for at least one of these six corners. The contour or cross-section can also take on other shapes, with at least one corner being formed.

[0016] In a method for securing a pole winding support screw of a pole winding support of an electrical machine, pole winding support screws are secured or held in a position predetermined by the securing device, depending on a contour of a securing device for the pole winding support screws.

[0017] In one embodiment of the method, the pole winding support screws are or will be tightened with different tightening torques. Thus, pole winding support screws can be positioned in specific positions on the intermediate element and / or on the support in order to apply a locking device. In particular, the locking device is always in the same position regardless of the screw used, whereby screws of the same type are used. In one embodiment of the method, a pole winding support of the type described is used.

[0018] For further explanation of the invention, reference is made to the figures, which illustrate the invention by way of example. Herein:

[0019] FIG 1 a first securing device for pole winding support screws and

[0020] FIG 2 a second securing device for pole winding support screws

[0021] The illustration in Figure 1 shows a pole winding support 1. The pole winding support 1 has pole winding support screws 2, 3, 4. The pole winding support screws 2, 3, 4 are screwed (screwed) into a shaft (not shown) via a support 8. The pole winding support screws 2, 3, 4 are secured by locks 14, 15, 16 in that the locks 14, 15, 16 are bent upwards towards the head of the pole winding support screw in the area of ​​a corner 17, 18, 19. The screws are secured by the locks which are bent (upwards) towards the head of the screw and can be made of sheet metal. Between the locks 14, 15, 16 and the support 8, which is made in particular of aluminum, there is an intermediate element 9, which is made in particular of sheet metal.

[0022] The illustration in Figure 2 shows a pole winding support 1. The pole winding support 1 has pole winding support screws 2, 3, 4. The pole winding support screws 2, 3, 4 are screwed into a shaft (not shown) 8 and guided through the support 8. The pole winding support screws 2, 3, 4 are secured by locks 5, 6. The locks 5, 6 are connected to the intermediate element 9 and / or the support 8 by means of screws 10, 11, 12, 13. The pole winding support screws 2, 3, 4 have heads. Between the heads of the screws and the support 8, as well as between the locks 5, 6 and the support 8, there is an intermediate layer, the intermediate element 9. When preparing tightening torques for the pole winding support screws, it is possible to bring the screw heads into a specific position relative to the support 8 or to the permanently mounted fuses 5, 6.For example, tightening torques can be expanded to a range of 250 - 750 Nm, so that the screw heads can be brought into a position that allows a sheet metal element with a screw head contour spaced at 30° to be inserted between the screw heads and screwed tight. This sheet metal element represents the locking device 5 or 6. This positive fit prevents the pole winding support screws from becoming loose. Since the pole winding support screws 2, 3, 4 in particular cannot be pre-tensioned but can only be tightened by hand, no defined tightening torque is necessary. A range is specified with which the pole winding support screws 2, 3, 4 are tightened and this range makes it possible to bring the screw head into a certain position within the 30° grid shown. The sheet metal element with the screw head contour is then very easy to fit. This sheet metal element represents the locking device 5 or 6.6 , which is screwed onto the intermediate element 9 . This prevents injuries caused by bending the corners of a sheet metal to secure the screws.

Claims

Patent claims 1. Pole winding support (1) of an electrical machine, with pole winding support screws (2, 3, 4) and a securing device (5, 6) for at least one pole winding support screw (2, 3, 4), the securing device (5, 6) being fixedly positioned.

2. Pole winding support (1) according to claim 1, wherein the securing means (5, 6) is screwed to an intermediate element (8).

3. Pole winding support (1) according to claim 1 or 2, wherein the securing means (5, 6) is welded to the intermediate element (8).

4. Pole winding support (1) according to one of claims 1 to 3, wherein a securing means (5, 6) secures at least two pole winding support screws (2, 3, 4).

5. Pole winding support (1) according to one of claims 1 to 4, wherein the securing means (5, 6) has a contour which corresponds to the contour of the head of the pole winding support screw (2, 3, 4).

6. Pole winding support (1) according to one of claims 1 to 5, wherein the securing means (5, 6) is arranged between two pole winding support screws (2, 3, 4).

7. Pole winding support (1) according to one of claims 1 to 6, wherein the pole winding support screw (2, 3, 4) is secured in a predetermined position depending on the contour of the head of the pole winding support screw (2, 3, 4).

8. Method for securing a pole winding support screw of a pole winding support of an electrical machine, wherein pole winding support screws (2, 3, 4) are secured in a position predetermined by the lock (5, 6) depending on a contour of a lock (5, 6) for the pole winding support screws (2, 3, 4).

9. The method according to claim 8, wherein the pole winding support screws (2, 3, 4) are tightened with different tightening torques.

10. The method according to claim 8 or 9, wherein a pole winding support (1) according to one of claims 1 to 7 is used.

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