WO2019223832A1

WO2019223832A1 - Grouping and stacking of rotor laminations for an electrical machine, electrical machine and method for producing a rotor

Info

Publication number: WO2019223832A1
Application number: PCT/DE2019/100393
Authority: WO
Inventors: Philipp Kraft; Christian Lutz
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2018-05-22
Filing date: 2019-05-03
Publication date: 2019-11-28
Also published as: DE102018112195A1

Abstract

The invention relates to a rotor (1) for an electrical machine, comprising a plurality of rotor laminations (2), which are designed to hold permanent magnets (3) and to be fastened to a rotor shaft (4), at least two rotor laminations (2) being anchored to one another at least for conjoint rotation, wherein, for the purpose of anchoring to one another, cup-like or hat-like indentations (5) are provided in the rotor laminations (2) and have depressions (6) on one rotor lamination side (2) and elevations (7) on the other rotor lamination side (2), the depressions and elevations being matched to one another in respect of their dimensions in order to be fastened to one another. Furthermore, the invention also relates to a method for producing a rotor (1) for an electrical machine, in which, in a first production step, at least two rotor laminations (2) of a plurality of rotor laminations (2), which are designed to hold permanent magnets (3), are anchored on one another at least for conjoint rotation, wherein indentations (5) are connected to one another, which have depressions (6) on one rotor lamination side (2) and elevations (7) on the other rotor lamination side (2), the depressions (6) and the elevations (7) being matched to one another in respect of their dimensions in order to be fastened to one another.

Description

Packaging and entanglement of rotor laminations for an electric machine. Electric machine and method of manufacturing a rotor

The present invention relates to a rotor for an electric machine, such as an electric motor, with a plurality of rotor laminations, which are designed for holding permanent magnets and for attachment to a rotor shaft, at least two rotor laminations at least rotationally fixed and advantageously axially fixed to each other are anchored. Furthermore, the present invention relates to a method for manufacturing a rotor for an electric machine.

From prior art DE 20 2009 007 597 U1, a laminated core for a rotor or stator is already known. The laminated core is formed of a plurality of axially stacked rotor or stator laminations for a rotor or stator of an electric machine with peripheral outer sections and inwardly integrally adjoining inner sections, along along an axially parallel generatrix of the laminated core packet bundle of at least one sheet are arranged differently far prominent outer edge.

Furthermore, the prior art DE 10 2016 216 773 A1 relates to a rotor lamination package and a laminated stator core for an electrical machine. The laminated rotor core comprises a plurality of rotor laminations stacked congruently in a stacking direction, wherein each of the rotor laminations has a central bore for attachment to a rotor shaft of the electric machine. The diameter of the central bore varies such that tabs, grooves and recessed areas are formed in the circumferential direction, and the diameter is greater than the diameter of the rotor shaft in the region of the grooves and the reset areas, whereas the diameter in the region of the tabs is smaller as the diameter of the rotor shaft. Furthermore, the tabs and grooves of adjacent rotor laminations are offset in the circumferential direction in such a way that when the rotor laminations are pushed onto the rotor shaft, the tabs can be plastically deformed by the rotor shaft, can thereby be bent into the slots and be frictionally locked can be attached to the rotor shaft. The stator core can be done in a similar way be secured by tabs and grooves in a housing of an electrical machine.

In many electric motor designs, a defined restriction of the individual rotor laminations / rotor laminations is of great importance for their function. Therefore, it is important to adjust the entanglement of the rotor laminations / rotor laminations accordingly, as well as to add them to the rotor shaft at the specified entanglement angles and to ensure that these are maintained during operation.

It is therefore the object of the invention to eliminate or at least mitigate the disadvantages of the prior art, and in particular to provide a rotor in which the individual rotor laminations do not rotate with one another and likewise the laminations retain their entanglement angle.

In a generic device according to the invention, the object of the invention is achieved in that, for anchoring to each other in the rotor laminations, preferably all rotor laminations, such cup-shaped or hat-shaped passages have recesses on one rotor-plate side and tolerances on the other rotor-plate side own, are present, which are matched in their dimensions for attachment to each other. This means that the implementation of the entanglement of the individual rotor laminations / rotor laminations to each other is simplified by the presence of the depressions or elevations on the respective sides of the rotor laminations. By means of such an anchoring it is possible to ensure / maintain the desired position of the rotor laminations relative to each other, but also of the rotor laminations to one another.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

In this context, it is particularly advantageous if the inner diameter of the recess of the one rotor plate is matched to the outer diameter of the elevations of the other rotor plate for effecting a fastening, for example by forcing a press fit. In other words, the inside diameter of the recess of the one rotor plate is opposite the outside diameter. The size of the other rotor plate accordingly smaller in order to cause a press connection. This has the advantage that no screws are necessary to form the at least one rotor laminated core. Furthermore, a rotation of the individual rotor laminations to each other is not possible.

It is advantageous if a plurality of first rotor laminations form a first rotor laminated core and / or a plurality of second rotor laminates form a second rotor laminar core. When a rotor core stack is formed, the individual sheets are pressed into each other in exactly one position. In this case, the fixation takes place via the passages, in other words, the depressions or elevations of the respective rotor plate sides. Thus, the packaging and entanglement of rotor plates is prescribed by a defined arrangement of depressions and elevations. This simplifies both the arrangement and the assembly of the individual rotor laminations.

It is also preferred if further rotor laminations form further n-rotor laminations. This has the advantage that assembling all the trained rotor laminations forms an entire rotor.

Furthermore, it is expedient if at least in that rotor plate of the second rotor terblechpackets, which abuts the adjacent rotor plate of the first rotor core, a hole formed as a hole, for example as a through hole, the inner diameter so on a grandeur of the rotor plate of the first rotor laminated core is agreed that there is a force and / or form fit between them, for example by means of a press fit. In other words, an interlocking between the rotor lamination packages can be realized with such a clearance / recess combination by respectively pressing the obtained through-part into the corresponding release position. The passages and recesses are combined in the individual patterns in such a way that a defined entanglement between the individual rotor laminations is possible. By this entanglement is again ensured / ensured that the rotor laminations can not rotate each other even during operation. Furthermore, it is advantageous if there are corresponding clearances in position in the rotor laminations, preferably all rotor laminations of a rotor laminations.

It is preferred if the passages of the one rotor lamination stack and the clearances of the adjacent rotor lamination stack are offset relative to one another in the circumferential direction by an angle a relative to their position relative to the lamination device present on the rotor laminations for flattening the permanent magnets. By such an application of an angle a and thus a rotation of the rotor laminations to each other can be profited from a reduction of the torque ripple / torque.

The flattening devices expediently include recesses in the respective rotor laminations. It is advantageous if the angle a is shifted in a range of 1, 5 degrees to 2.5 degrees, preferably 2 degrees.

Furthermore, the invention relates to an electric machine with a rotor according to one of the preceding aspects.

Furthermore, the invention relates to a method for Fierstellen a rotor for an electric machine, such as in the manner of an electric motor, in which at least two rotor laminations of a plurality of rotor plates, which are designed for the folding of permanent magnets, at least rotatably anchored to each other in a first Fierstellungsschritt are, with each other, which have recesses on one side of the rotor lamination sheet and on the other side of the rotor lamination, connected / anchored with each other, wherein the recesses and the sublime are matched in their dimensions for attachment to each other.

The inner diameter of the recesses of one rotor lamination is matched to the outer diameter of the other rotor lamination for effecting an attachment. In this case, the multiplicity of rotor laminations form one or more rotor laminations which, in a second production step, form a first rotor laminations package with a second rotor laminations package by compressing the grandeur of the first rotor laminations. terblechpakets is connected in a trained as a hole exemption of the second Rotorblechpa- kets. The rotor laminations are then joined together / assembled and fastened to a rotor shaft.

Such a method ensures a simplified manufacture of the rotor. On the one hand, the joining together of the individual rotor laminations with one another to form a rotor laminating unit is simplified and, on the other hand, the assembly of the individual rotor laminations into a rotor is simplified. Despite the absence of a complicated screw connection, a corresponding predefined position of the individual rotor laminations or rotor laminations can be ensured / ensured to one another.

The invention will be explained below with the aid of a drawing. It shows

1 shows a cross section of a rotor.

Fig. 2 is a front view of a rotor sheet;

Fig. 3 is an oblique view of the rotor plate;

4 shows a cross section of a rotor lamination;

5 shows a detail of the unassembled rotor lamination packages;

6 shows a detail of the assembled rotor laminated cores;

7 shows a cross section through the assembled rotor laminations and the rotor shaft;

Fig. 8 steps for assembling the individual rotor laminations to the rotor lamination stack; and

Fig. 9 steps to assemble the rotor laminations to the Gesamttrotorblechp- ket.

The figures are merely schematic in nature and serve only to understand the invention. The same elements are provided with the same reference numerals.

1 shows a cross-sectional view of a rotor 1 having a multiplicity of rotor laminations 2 which are designed to hold permanent magnets (as shown in FIG. 2) in correspondingly illustrated recesses 3 and for fastening to a rotor shaft 4. At least two rotor laminations 2 are at least rotationally fixed in this case. anchored to each other. In the rotor laminations 2 are such anchorages to each other 5 such that on one side of the rotor plate 2 recesses 6 and on the other side of the rotor plate 2 majesties have 7, which are matched in their dimensions for attachment to each other.

A multiplicity of rotor laminations 2 are joined together to form a first rotor laminations 8. Of these, four rotor laminations 8 are shown in Fig. 1. It can be seen that the elevations 7 of the pitches 5 of the first rotor plate 2 engage in the depressions 6 of the adjacent rotor plate 2. The last rotor plate 2 of a rotor lamination stack 8 engages with its majesty 7 in the exemption 9 of the first rotor plate 2 of the second rotor lamination stack 8. In this way, both the rotor laminations 2 are interlocked with each other, as well as the individual Ro- torblechpakete 8 are interlocked.

2 shows a front view of a rotor plate 2. The rotor plate 2 shows the recesses 3, which are designed for fastening and holding the permanent magnets. In addition, the throws 5 and exemptions 9 are shown.

Fig. 3 shows an oblique front view of a rotor plate 2. Also in Fig. 3, the recesses 3 for holding and fixing the permanent magnets are shown. Corresponding to FIG. 2, the throws 5 and exemptions 9 are shown.

FIG. 4 shows a cross-section along the line IV of FIG. 2. In FIG. 4, two rotor laminations 2 with corresponding recesses 3 for holding and fastening the permanent magnets can be seen. Each rotor plate 2 has in each case an exemption 9 and an adjustment 5. Each setting 5 has both a depression 6 on one side of the rotor lamination 2 and a sublime 7 on the other side of the respective rotor lamination 2. Here, the grandeur 7 of the first rotor lamination 2 is pressed into the recess 6 of the second rotor lamination 2 according to the arrow 10 ,

When joining the individual rotor laminations 2 to form a laminated rotor core 8, the individual rotor laminations 2 are pressed or pressed undiluted into one another. In the process, the grandeur 7 of the passage 5 presses into the depression 6 of the following rotor plate 2. 5 shows a section of the unassembled rotor laminations 8. In the frontal plane of the first three rotor laminations 8 seen from the left, the reliefs 9 of the assembled rotor laminations 2 can be seen. Likewise, the recesses 3 are shown for folding and fixing the permanent magnets. Both the first rotor lamination stack 8 and the second rotor lamination stack 8 show the depressions 6 and the raised areas 7 of the starting or end rotor lamination 2 in a ridge manner.

This view makes it clear how the rotor laminations 8 are rotated relative to one another, so that the elevations 7 of one rotor lamin 2 of the first laminar laminates 8 engage in the recess 9 of the second rotor laminations 8. The same applies to the connection between the second rotor core 8 and the third rotor core 8. The connection between the third rotor core 8 and the fourth rotor core 8 is not shown in this drawing.

FIG. 6 shows a section of the rotor 1 with assembled rotor laminated cores 8. In this case, the engagement of the raised areas 7 of the rotor sheet 2 of the first rotor core 8 is shown in the relief 9 of the adjacent rotor core 2 of the second rotor core 8. The same applies to the connections between the second rotor laminated core 8 with the third rotor core 8 and the third rotor core 8 with the fourth rotor core 8.

In addition, it is shown in Fig. 6, we are the recesses 3 of a rotor laminated core 8 to the recesses 3 of an adjacent rotor core 8 are rotated. Furthermore, it can be seen that the first rotor laminated core 8 is rotated in the same direction and at the same entanglement angle a relative to the second rotor core packet 8, as the second rotor core 8 for the third rotor core 8 and the third rotor core 8 for the fourth Rotor core 8.

FIG. 7 shows a cross section of the assembled rotor laminations 2 to form a complete rotor laminations 8, which is placed on the rotor shaft 4. The individual rotor laminations 2 are shown, which mesh through their recesses 6 and sublimities 7. Likewise, the rotor laminations 2 formed by the rotor laminations 8 are shown. Furthermore, in turn, the rotation of the ro- Torblechpakete 8 to see each other. Preferably, the second rotor plate 2 is rotated by 2 ° to the first rotor plate 2. Thus, the subsequent Ro- torblechpakete 8 by 4 ° or 6 °, based on the first rotor core 8, twisted. FIG. 8 illustrates the joining together of the individual rotor laminations 2 to form a rotor lamination package 8. In this case, as already mentioned in FIG. 4, the elevations 7 of one rotor lamin 2 are inserted into the depressions 6 of the following rotor lamin 2. When joining a plurality of such rotor laminations 2, a rotor lamination stack 8 finally results.

In Fig. 9 the assembly of the individual rotor laminations 8 to the entire rotor 1 is shown. In this case, the elevations 7 of the first rotor lamination stack 8 are inserted into the release position 9 of the second rotor lamination stack 8 in accordance with the arrow 11. Here, depending on the punching pattern, that is, the combination of the settings 5 and exemptions 9, the Verschränkungswinkel a adjustable. In the example shown in FIG. 9, an entanglement angle a of 2 ° is depicted.

When assembling the entire rotor 1, the majesty 7 of a rotor plate 2 of the first rotor core 8 is pressed into the free position 9 of the adjacent rotor plate 2 of the second 8 on different pitch circles at four positions on the order.

LIST OF REFERENCES

1 rotor

2 rotor sheet

3 recesses

4 rotor shaft

5 adjustment

6 deepening

7 grandeur

8 rotor core

9 exemption

10 arrow

11 arrow

a entanglement angle

Claims

claims

1. rotor (1) for an electric machine, with a plurality of rotor laminations (2), which are designed for holding permanent magnets (3) and for fixing to a rotor shaft (4), wherein at least two rotor laminations (2) at least rotationally fixed anei are anchored to each other, characterized in that for anchoring to each other in the rotor laminations (2) such cup- or hat-like projections (5) on one side of the rotor rotor (2) recesses (6) and on the other Rotorblechsei- te (2) sublime (7) are present, which are matched in their dimensions for attachment to each other.

2. rotor (1) according to claim 1, characterized in that the inner diameter of the recess (6) of the one rotor plate (2) to the outer diameter of the majesty (7) of the other rotor plate (2) is tuned to cause an attachment.

3. rotor (1) according to one of claims 1 or 2, characterized in that a plurality of first rotor laminations (2) form a first rotor laminated core (8) and / or a plurality of second rotor laminations (2) form a second rotor laminations (8).

4. Rotor (1) according to claim 3, characterized in that further rotor laminations (2) form further n-rotor laminations (8).

5. rotor (1) according to one of claims 3 or 4, characterized in that at least in that rotor plate (2) of the second rotor lamination stack (8), which abuts the adjacent rotor plate (2) of the first rotor lamination stack (8), as Hole formed exemption (9) is present, whose inner diameter is tuned to a grandeur (7) of the rotor plate (2) of the first rotor laminated core (8) that there is a force and / or positive connection between them.

6. rotor (1) according to claim 5, characterized in that in the rotor laminations (2) of a rotor laminated core (8) in position corresponding exemptions (9) are present.

7. rotor (1) according to one of claims 3 to 6, characterized in that the

Adjustments (5) of the one rotor laminated core (8) and the exemptions (9) of the adjacent rotor core (8) with respect to their position on the rotor laminations (2) for folding the permanent magnets (3) present in the peripheral direction by an angle (a) offset from each other.

8. rotor (1) according to claim 7, characterized in that the Halteeinrichtun- gene recesses in the respective rotor laminations (2).

9. Electric machine with a rotor (1) according to one of the preceding claims.

10. A method for Fierstellen a rotor (1) for an electric machine, wherein in a first Fierstellungsschritt at least two rotor laminations (2) of a plurality of rotor laminations (2), which are designed to fold permanent magnet (3), at least rotationally fixed to be anchored to each other, with enforcements

(5) having on one rotor plate side (2) recesses (6) and on the other T- rotor plate side (2) sublime (7) are joined together, wherein the recesses (6) and sublime (7) in their dimensions are matched to each other for fastening.