ROTOR OF AN ELECTRIC MOTOR

Abstract

A rotor of an electric motor may include a basic shaft, a plurality of plate stacks, at least one balancing element structured and arranged to offset imbalances, and a drive element. The at least one balancing element and the drive element may be integrally provided as a one-piece, monolithic component.

Claims

1. A rotor of an electric motor, comprising: a basic shaft; a plurality of plate stacks; at least one balancing element structured and arranged to offset imbalances; a drive element; and wherein the at least one balancing element and the drive element are integrally provided as a one-piece, monolithic component.

2. The rotor according to claim 1, wherein: the monolithic component includes a holding device integrally formed therewith; the drive element is structured as a cylindrical axial extension and the at least one balancing element is structured as a radial collar disposed on the holding device; and the radial collar and the axial extension are connected to one another via a hollow cylinder section.

3. The rotor according to claim 2, wherein the holding device, via the hollow cylinder section, is fixed on the basic shaft via a press fit connection.

4. The rotor according to claim 2, further comprising a spring element arranged between the holding device and the plurality of plate stacks.

5. The rotor according to claim 4, wherein the spring element is configured as at least one of an annular wave disc and an elastic plastic part.

6. The rotor according to claim 2, wherein the plurality of plate stacks and the holding device are axially connected to one another in a positive-locking manner.

7. The rotor according to claim 1, wherein the at least one balancing element includes at least one bore configured to offset an imbalance.

8. The rotor according to claim 1, wherein the monolithic component is structured as a plug and engages in the basic shaft.

9. The rotor according to claim 1, wherein the drive element has a smaller outer diameter than the basic shaft.

10. The rotor according to claim 1, wherein the plurality of plate stacks are connected to one another in a positive-locking manner.

11. The rotor according to claim 1, wherein the basic shaft is structured as a tube.

12. An electric motor, comprising a rotor including: a basic shaft a plurality of plate stacks; at least one balancing element structured and arranged to offset imbalances; a drive element and wherein the at least one balancing element and the drive element are integrally provided as a one-piece, monolithic component.

13. The electric motor according to claim 12, wherein: the monolithic component includes a holding device integrally formed therewith; the drive element is structured as a cylindrical axial extension and the at least one balancing element is structured as a radial collar disposed on the holding device; and the radial collar and the axial extension are connected to one another via a hollow cylinder section.

14. The electric motor according to claim 13, wherein the holding device, via the hollow cylinder section, is fixed on the basic shaft via a press fit connection.

15. The electric motor according to claim 13, further comprising a spring element arranged between the holding device and the plurality of plate stacks, wherein the spring element is configured as a plastic and elastic annular wave disc.

16. The electric motor according to claim 12, wherein the at least one balancing element includes at least one bore configured to offset an imbalance.

17. The rotor according to claim 1, wherein the plurality of plate stacks are bonded to one another.

18. The rotor according to claim 2, further comprising a spring element arranged between the balancing element and the plurality of plate stacks.

19. The rotor according to claim 2, wherein the plurality of plate stacks and the holding device are bonded to one another.

20. The rotor according to claim 4, wherein the spring element is configured as an annular wave disc.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] It shows, in each case schematically,

[0026] FIG. 1 shows a sectional representation through a rotor according to the invention of an electric motor likewise according to the invention,

[0027] FIG. 2 shows a sectional representation through a further embodiment of the rotor according to the invention.

DETAILED DESCRIPTION

[0028] According to FIGS. 1 and 2, a rotor 1 according to the invention of an electric motor 2 which is otherwise not shown, comprises a basic shaft 3, on which the plate stacks 4 are arranged. Likewise provided is at least one balancing element 5, according to FIG. 1 even two balancing elements 5, for offsetting imbalances of the rotor 1. According to the invention, the balancing element 5 and a drive element 6 are now formed integrally and form a one-piece component 13. According to FIG. 1, the component 13 additionally forms a holding device 7 for fixing the plate stacks 4.

[0029] According to FIG. 1, two holding devices 7 are drawn in on the rotor 1, wherein it is obviously also conceivable that such a rotor 1 merely comprises a single component 13 with holding device 7, a balancing element 5 and a drive element 6.

[0030] With the holding device 7 it is possible for the first time to now combine and integrally form a previously separate balancing disc and a separate drive element in the holding device 7, so that the holding device 7 with the drive element 6 and the balancing element 5 can be produced in a common manufacturing process and assembled in a common assembly process.

[0031] The drive element 6 can be formed as cylindrical axial extension while the balancing element 5 can be formed as a radial collar. According to FIG. 1, the radial collar 5 and the axial extension are connected to one another via a hollow cylinder section 8. Here, the holding device 7 can be connected to the basic shaft 3 via its respective hollow cylinder section 8, for example via a press fit, a bonding, a soldering or a thermal joining method.

[0032] Viewing FIG. 1 in more detail it is noticeable that between the holding device 7, in particular between the radial collar or the balancing element 5, and the plate stacks 4 a spring element 9 is arranged which makes possible to compensate for axial dimensional inaccuracies. It is likewise conceivable here that when pressing the holding device 7 via its hollow cylinder section 8 onto the basic shaft 3 an axial preloading of the plate stacks 4 occurs that is so strong that the same are reliably held and require no further fixing. Obviously, it is also conceivable here that merely one such spring element 9 is provided, i.e. other than currently shown in FIG. 1.

[0033] The spring element 9 can be formed for example as annular wave disc or as elastic plastic part, wherein according to FIG. 1 it is represented as annular wave disc. Such an annular wave disc has circular wave peaks and wave troughs and makes possible a compression in the axial direction and thereby a spring preload of the plate stacks 4 or also a compensation of any axial dimensional inaccuracies that may be present.

[0034] Here, the individual plate stacks 4 can be axially connected to one another in a positive-locking manner, so that in one of the plate stacks 4 for example a recess 10 is provided, into which an adjacent plate stack 4 with a corresponding extension 11 engages. Additionally or alternatively, the individual plate stacks 4 can obviously also be bonded to one another.

[0035] Analogously it is also conceivable that the plate stacks 4 and the holding device 7 are axially connected to one another in a positive-locking manner for example in the same way as the previously described plate stacks 4 among themselves, wherein it is also obviously conceivable here that the plate stacks 4 and the holding device 7 are bonded to one another.

[0036] In order to be able to offset any present imbalances of the rotor 1, at least one bore 12 can be provided in the balancing element 5 according to FIGS. 1 and 2, which can also be generally configured as recess and represents a material reduction and thus a weight reduction or mass reduction. Alternatively it would be obviously also be conceivable to arrange imbalance elements.

[0037] In addition to this, the basic shaft 3 can be formed as hollow shaft or as tube and because of this have a comparatively high bending stiffness and low weight at the same time. By way of this it is possible to form the rotor 1 in an altogether weight-reduced manner.

[0038] According to FIG. 2, the drive element 6 or the one-piece component 13 is formed as a plug and engages in the hollow shaft 3, or is in particular pressed into the same. There, the section of the component 13 forming the balancing element 5 can engage in the basic shaft 3 and by way of this be arranged in an installation space-optimised manner. Here, the balancing element 5 can obviously also be formed by parts of the drive element 6 or of the radial collar.

[0039] With the rotor 1 according to the invention it is now possible to combine components previously produced separately, namely a balancing disc and a drive element, in a one-piece component 13. By way of this, not only can the manufacturing process be kept simpler and more cost-effective but at the same time also an assembly process, since merely a single component 13 has to be assembled with the basic shaft 3 and the plate stacks 4 without a separate assembly of the balancing element 5 or of the drive element 6 having to take place.

[0040] By way of the rotor 1 according to the invention, the electric motor 2 according to the invention can also be produced more cost-effectively.