METHOD FOR PRODUCING A ROTOR OF AN ELECTRIC MACHINE

Abstract

A method for producing a rotor of an electric machine is disclosed. The method may include providing at least two individual parts and individually balancing the at least two individual parts. The method may also include, subsequently to balancing the at least two individual parts, connecting the at least two balanced individual parts to one another such that the rotor is at least unbalance-low.

Claims

1. A method for producing a rotor of an electric machine, comprising: providing at least two individual parts; individually balancing the at least two individual parts, and subsequently to individually balancing the at least two individual parts, connecting the at least two balanced individual parts to one another such that the rotor is at least unbalance-low.

2. The method according to claim 1, wherein: the at least two individual parts includes at least one tubular shaft centre piece, a first end piece, and a second end piece; and connecting the at least two balanced individual parts includes connecting the first end piece and the second end piece to the at least one tubular shaft centre piece such that the rotor is at least unbalance-low.

3. The method according to claim 2, wherein: the at least two individual parts further includes at least one of at least one rotor lamination, at least one balancing disc, at least one magnet, a shaped body, and a plurality of windings; and connecting the at least two balanced individual parts further includes connecting the at least one of the at least one rotor lamination, the at least one balancing disc, the at least one magnet, the shaped body, and the plurality of windings to the first end piece, the second end piece, and the at least one tubular shaft centre piece such that the rotor is at least unbalance-low.

4. The method according to claim 2, further comprising, prior to connecting the first end piece and the second end piece to the at least one tubular shaft centre piece, aligning the first end piece and the second end piece about an axis of rotation of the rotor such that the rotor is at least unbalance-low.

5. The method according to claim 2, wherein connecting the first end piece and the second end piece to the at least one tubular shaft centre piece includes screwing the first end piece and the second end piece together with the at least one tubular shaft centre piece.

6. The method according to claim 2, wherein connecting the first end piece and the second end piece to the at least one tubular shaft centre piece includes gluing the first end piece and the second end piece to the at least one tubular shaft centre piece.

7. The method according to claim 2, wherein connecting the first end piece and the second end piece to the at least one tubular shaft centre piece includes pressing the first end piece and the second end piece together with the at least one tubular shaft centre piece.

8. The method according to claim 2, wherein connecting the first end piece and the second end piece to the at least one tubular shaft centre piece includes welding the first end piece and the second end piece together with the at least one tubular shaft centre piece.

9. A rotor of an electric machine produced according to the method of claim 1.

10. An electric machine, comprising the rotor according to claim 9.

11. The method according to claim 1, wherein the rotor is unbalance-free.

12. The method according to claim 1, further comprising, when at least a subset of the at least two balanced individual parts have tolerable unbalances, counterbalancing the tolerable unbalances via rotating at least some of the at least two balanced individual parts relative to one another around an axis of rotation of the rotor.

13. The method according to claim 12, wherein counterbalancing the tolerable unbalances is performed prior to connecting the at least two balanced individual parts.

14. The method according to claim 5, wherein the first end piece and the second end piece are screwed to the at least one tubular shaft centre piece via a plurality of tie rods.

15. The method according to claim 14, wherein: the plurality of individual parts further includes at least one balancing disc; and the method further comprises counterbalancing unbalances resulting from the plurality of tie rods with the at least one balancing disc.

16. A method for producing a rotor of an electric machine, comprising: providing a plurality of individual parts; balancing the plurality of individual parts; and subsequently to balancing the plurality of individual parts, connecting the plurality of balanced individual parts to one another such that the rotor is at least unbalance-low.

17. The method according to claim 16, further comprising combining a subset of the plurality of individual parts to form a subassembly group.

18. The method according to claim 17, wherein balancing the plurality of individual parts includes individually balancing a remainder of the plurality of individual parts and the subassembly group.

19. The method according to claim 16, wherein: the plurality of individual parts includes a tubular shaft centre piece, a first end piece, and a second end piece; and connecting the plurality of balanced individual parts includes connecting the first end piece and the second end piece to the tubular shaft centre piece.

20. The method according to claim 19, wherein: the plurality of individual parts further includes at least one rotor lamination, at least one magnet, at least one shaped body, and at least one winding; and connecting the plurality of balanced individual parts further includes connecting the at least one rotor lamination, the at least one magnet, the at least one shaped body, and the at least one winding to at least one of the first end piece, the second end piece, and the tubular shaft centre piece.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] There it shows, in each case schematically:

[0021] FIG. 1 shows a flow diagram of a method according to the invention,

[0022] FIG. 2 shows a sectional representation through a rotor of an electric machine produced in accordance with the method according to the invention.

DETAILED DESCRIPTION

[0023] With a method according to the invention for producing a rotor 1 (see FIG. 1) of an electric machine 2 according to FIG. 1, in particular of an electric motor or of a generator, initially at least two individual parts 3 are provided in a method step A and subsequently balanced individually in a method step B. Following this, the at least two balanced individual parts 3 are connected to one another in the method step C in such a manner that the rotor 1 assembled from these is at least unbalance-low or is preferentially even unbalance-free. Because of the separate balancing of the individual parts 3 according to the invention it is possible to balance these even prior to the actual assembly to form the rotor 1 and because of this avoid both an elaborate balancing of the entire rotor 1 and also reduce a scrap rate of already fully assembled rotors 1 because of unbalancing faults that cannot be counterbalanced.

[0024] Between the method steps B and C a method step Bi can be additionally carried out which according to FIG. 1 is represented by a dashed drawn line and thus merely provided purely optionally. In the method step Bi, the two individual parts 3 already balanced individually can be arranged rotated relative to one another about an axis of rotation 4 (see FIG. 2) prior to being connected or assembled in the method step C in such a manner that any unbalances of the individual parts 3 that may still exist under certain conditions can be further reduced by the arrangement aligned relative to one another.

[0025] With the method according to the invention it is additionally possible to tolerate larger unbalance tolerances of the individual parts 3 and separately produce and balance complex individual parts 3 which compared with a balancing of the entire fully assembled rotor 1 performed in the past, is significantly simpler in terms of production.

[0026] As individual parts 3, a tubular shaft centre piece 5 and a first end piece 6 and a second end piece 7 can be employed for example. However, as individual parts, rotor laminations 8, a shaped body 9, magnets and/or windings or a balancing disc can be additionally be employed. Independently of the respective embodiment of the individual parts 3, these are balanced individually and/or combined into a preassembly group, prior to being assembled to form the rotor 1.

[0027] The end pieces 6, 7 can be screwed together with the tubular shaft centre piece 5, as a result of which a maintenance and repair-friendly rotor 1 can be created. Alternatively it is obviously also conceivable that the end pieces 6, 7 are glued, pressed and/or welded together with the tubular shaft centre piece 5.

[0028] With the method according to the invention it is possible to recognise and separate any existing scrap at an early stage, i.e. even at the state of the individual parts 3 so that such faulty scrap parts are no longer utilised or employed for assembling the rotor 1, as a result of which the scrap rate of the rotors 1 can be significantly lowered.

[0029] The shaft centre piece 5 serves as carrier of the rotor laminations 8 and for torque transmission as required, wherein the torque transmission can also take place by a one-piece or multi-part shaped body 9, which is arranged within the shaft centre piece 5.