DE102018112195A1 - Packaging and entanglement of rotor laminations for an electric machine, electric machine and method of manufacturing a rotor - Google Patents

Abstract

The invention relates to a rotor (1) for an electric machine, having a multiplicity of rotor laminations (2) designed for holding permanent magnets (3) and fixing them to a rotor shaft (4), at least two rotor laminations (2) being at least rotationally fixed are anchored to each other, wherein for anchoring to each other in the rotor laminations (2) such cup- or hat-like projections (5) on the one rotor plate side (2) recesses (6) and on the other rotor plate side (2) have sublime (7), are present, which are matched in their dimensions for attachment to each other. Furthermore, the invention also relates to a method for producing a rotor (1) for an electric machine, in which in a first production step at least two rotor laminations (2) of a plurality of rotor laminations (2), which are designed for holding permanent magnets (3) at least rotationally fixed to each other are anchored, wherein through-holes (5) on one side of the rotor plate (2) depressions (6) and on the other rotor plate side (2) sublime (7) are joined together, wherein the recesses (6) and the Dignities (7) are matched in their dimensions for attachment to each other.

Description

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 to hold permanent magnets and for attachment to a rotor shaft, wherein at least two rotor laminations are at least rotationally fixed and advantageously axially fixed to each other. Furthermore, the present invention relates to a method for manufacturing a rotor for an electric machine.

From the state of the art DE 20 2009 007 597 U1 is already known a laminated core for a rotor or stator. 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 an axially parallel generatrix of the laminated core packet bundle of at least one sheet with different lengths are arranged above the outer edge.

Furthermore, the prior art relates DE 10 2016 216 773 A1 a rotor core and a laminated stator core for an electric 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 area of the grooves and the recessed areas, whereas the diameter in the area of the tabs is smaller than that Diameter of the rotor shaft. Furthermore, the tabs and grooves of adjacent rotor laminations in the circumferential direction are offset from one another 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 secured to the rotor shaft , The stator lamination stack may similarly 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.

The object of the invention is achieved in a generic device according to the invention that for anchoring to each other in the rotor laminations, preferably all rotor laminations, such napf- or hat-like projections, which have on one side Rotorblechseite depressions and on the other rotor side sheet sublimities, are present 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 such an anchoring a maintenance of the desired position of the rotor laminations to each other, but also the rotor laminations to each other can be ensured / ensured.

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 inner diameter of the recess of the one rotor plate with respect to the outer diameter of the majesty of the other rotor plate is correspondingly smaller in order to be able to produce a press connection. This has the advantage that no screw connections are necessary for forming 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 forming a respective rotor laminated core, the individual sheets are pressed into each other in exactly one position. Here, the fixation on the Durchstellungen, in other words, the depressions or sublimities of the respective rotor sheet sides. Thus, the packaging and entanglement of rotor laminations is prescribed by a defined arrangement of depressions and sublimities. 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 an assembly of all trained rotor laminations form an entire rotor.

Furthermore, it is expedient if at least in that rotor plate of the second rotor lamination stack, which abuts the adjacent rotor lamination of the first rotor lamination, a clearance formed as a hole, for example as a through hole, is provided, the inner diameter of which is matched to a grandeur of the rotor lamination of the first rotor lamination stack in that a force and / or form fit is present between them, for example by means of a press fit. In other words, can be realized with such a Durchgangsungs- / Aussparungskombination entanglement between the rotor laminations by each of the raised enforcement part is pressed into the appropriate exemption. The passages and recesses are combined in the individual patterns so that a defined entanglement between the individual rotor lamination packages 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 in the rotor laminations, preferably all rotor laminations of a rotor laminations, in position corresponding exemptions are present.

It is preferred if the passages of the one rotor lamination stack and the exemptions of the adjacent rotor lamination stack in the circumferential direction by an angle with respect to their position to the present on the rotor laminations for holding the permanent magnets holding means α offset from each other. By such an application of an angle α and thus a rotation of the rotor laminations to each other can be benefited by a reduction of the torque ripple / torque.

Conveniently, the holding means include recesses in the respective rotor laminations. It is advantageous if the angle α 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 producing a rotor for an electric machine, for example in the manner of an electric motor, in which at least two rotor laminations of a plurality of rotor laminations, which are designed to hold permanent magnets, are at least rotationally fixedly anchored to one another in a first production step, wherein constrictions having recesses on the one side of the rotor lamination and on the other side of the rotor lamination are joined / anchored to one another, the recesses and the sublime being adapted to one another in terms of their dimensions for fastening to one another.

The inner diameter of the recesses of one rotor lamination is matched to the outer diameter of the other rotor lamination to effect an attachment. Here, the plurality of rotor laminations form one or more rotor laminations, which in a second manufacturing step, a first rotor laminated core is connected to a second rotor laminations by pressing the majesty of the first rotor laminations in a trained as a hole exemption of the second rotor laminations. Subsequently, the rotor laminations are assembled / assembled and secured 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 is simplified to form a rotor laminations, and, on the other hand, the assembly of the individual laminations into a rotor is simplified. Despite the lack of a complex screw, a corresponding predefined position of the individual rotor laminations or rotor laminations to each other can be ensured / ensured.

• 1 einen Querschnitt eines Rotors;
• 2 eine Frontansicht eines Rotorblechs;
• 3 eine schräge Ansicht des Rotorblechs;
• 4 einen Querschnitt eines Rotorblechs;
• 5 einen Ausschnitt der nichtzusammengefügten Rotorblechpakete;
• 6 einen Ausschnitt der zusammengefügten Rotorblechpakete;
• 7 einen Querschnitt durch die zusammengefügten Rotorblechpakete und die Rotorwelle;
• 8 Schritte zum Zusammenfügen der einzelnen Rotorbleche zum Rotorblechpaket; und
• 9 Schritte zum Zusammenfügen der Rotorblechpakete zum Gesamtrotorblechpaket.

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

• 1 a cross section of a rotor;
• 2 a front view of a rotor sheet;
• 3 an oblique view of the rotor sheet;
• 4 a cross section of a rotor sheet;
• 5 a section of unassembled rotor laminations;
• 6 a section of the assembled rotor laminations;
• 7 a cross section through the assembled rotor laminations and the rotor shaft;
• 8th Steps for assembling the individual rotor laminations to the rotor laminations; and
• 9 Steps for assembling the rotor lamination packages to the overall rotor lamination stack.

The figures are merely schematic in nature and are for the sole purpose of understanding the invention. The same elements are provided with the same reference numerals.

1 shows a cross-sectional view of a rotor 1 , which has a large number of rotor laminations 2 having for holding permanent magnets (as in 2 to see) in corresponding recesses 3 and for attachment to a rotor shaft 4 are designed. At least two rotor laminations 2 at least rotatably anchored to each other. In the rotor laminations 2 are to be anchored to each other such Durchstellungen 5 on one side of the rotor blade 2 wells 6 and on the other side of the rotor blade 2 elevations 7 own, present, which are matched in their dimensions for attachment to each other.

A variety of rotor laminations 2 becomes a first rotor core 8th together. Of these are in 1 four rotor laminations 8th shown. It can be seen that the sublimity 7 of the constellations 5 of the first rotor plate 2 into the wells 6 of the adjacent rotor plate 2 intervention. The last rotor sheet 2 a rotor core 8th attacks with its grandeur 7 in the exemption 9 of the first rotor plate 2 of the second rotor core 8th on. In this way, both the rotor laminations 2 entangled with each other, as well as the individual rotor laminations 8th are interlocked.

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

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

4 represents a cross section according to the line IV out 2 in 4 are two rotor laminations 2 with corresponding recesses 3 to see and hold the permanent magnets. Every rotor sheet 2 each has an exemption 9 and an adjustment 5 on. Every adjustment 5 has both a recess 6 on one side of the rotor blade 2 and a grandeur 7 on the other side of the respective rotor plate 2 , This is the grandeur 7 of the first rotor plate 2 according to the arrow 10 into the depression 6 of the second rotor sheet 2 pressed.

When assembling the individual rotor laminations 2 to a rotor core 8th become the individual rotor laminations 2 Undrilled pressed / pressed together. This expresses the grandeur 7 the adjustment 5 into the depression 6 of the following rotor sheet 2 ,

5 shows a section of unassembled rotor laminations 8th , In the frontal plane of the first three rotor laminations, seen from the left 8th are the exemptions 9 the assembled rotor laminations 2 to see. Likewise, the recesses 3 shown for holding and securing the permanent magnet. Both the first rotor core 8th as well as the second rotor core 8th show the pits 6 and the sublimities 7 of the starting or end rotor plate 2 to some extent.

This view clarifies how the rotor laminations 8th twisted to each other, so the sublimities 7 of a rotor sheet 2 of the first rotor core 8th in the exemption 9 of the second rotor core 8th intervention. The same applies to the connection between the second rotor core 8th and the third rotor core 8th , The connection between the third rotor core 8th and the fourth rotor core 8th is not shown in this drawing.

6 shows a section of the rotor 1 with assembled rotor laminations 8th , Here is the intervention of the sublimities 7 of the rotor sheet 2 of the first rotor core 8th in the exemption 9 of the adjacent rotor plate 2 of the second rotor core 8th displayed. The same applies to the connections between the second rotor laminated core 8th with the third rotor laminated core 8th and the third rotor core 8th with the fourth rotor core 8th ,

Moreover, in 6 shown, we the recesses 3 of a rotor laminated core 8th to the recesses 3 an adjacent rotor core 8th are twisted. Furthermore, it can be seen that the first rotor laminated core 8th to the second rotor core 8th in the same direction and at the same entanglement angle α twisted, like the second rotor laminated core 8th to the third rotor core 8th or the third rotor core 8th to the fourth rotor core 8th ,

7 shows a cross section of the assembled rotor laminations 2 to an entire rotor core 8th , which is on the rotor shaft 4 is attached. It is the individual rotor laminations 2 shown, which through their wells 6 and sublimities 7 mesh. Likewise, those through the rotor laminations 2 trained rotor laminations 8th shown. Furthermore, in turn, the rotation of the rotor laminations 8th to see each other. Preferably, the second rotor plate 2 to the first rotor plate 2 rotated by 2 °. Thus, the subsequent rotor laminations 8th by 4 ° or 6 °, based on the first rotor laminated core 8th , twisted.

8th represents the assembly of the individual rotor laminations 2 to a rotor core 8th Here, as already in 4 mentioned, the sublimities 7 of a rotor sheet 2 into the wells 6 of the following rotor sheet 2 inserted. When assembling a plurality of such rotor laminations 2 finally results in a rotor core 8th ,

In 9 is the assembly of the individual rotor laminations 8th to the entire rotor 1 shown. Here are the majesty 7 of the first rotor core 8th according to the arrow 11 in the exemption 9 of the second rotor core 8th inserted. Here are dependent on the punching pattern, that is the combination of the enforcements 5 and exemptions 9 , the entanglement angle α adjustable. In the in 9 Example shown is a Verschränkungswinkel α represented by 2 °.

When assembling the entire rotor 1 becomes at four positions over the circumference the sublimity 7 of a rotor sheet 2 of the first rotor core 8th in the exemption 9 of the adjacent rotor plate 2 of the second 8 pressed on different pitch circles.

LIST OF REFERENCE NUMBERS

1

rotor

2

rotor sheet

3

recesses

4

rotor shaft

5

by position

6

deepening

7

sublimity

8th

Laminated core

9

exemption

10

arrow

11

arrow

α

angle of twist

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202009007597 U1 [0002]
• DE 102016216773 A1 [0003]

Claims (10)

Rotor (1) for an electric machine, having a multiplicity 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 each other at least in a rotationally fixed manner, characterized in that for anchoring to each other in the rotor laminations (2) such cup- or hat-like projections (5) on the one rotor plate side (2) recesses (6) and on the other rotor plate side (2) have sublime (7) present are, which are matched in their dimensions for attachment to each other. 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. Rotor (1) according to one of Claims 1 or 2 , characterized in that a plurality of first rotor laminations (2) form a first rotor lamination stack (8) and / or a plurality of second rotor laminates (2) form a second rotor lamination stack (8). Rotor (1) according to Claim 3 , characterized in that further rotor laminations (2) form further n-rotor laminations (8). Rotor (1) according to one of Claims 3 or 4 , characterized in that at least in that rotor plate (2) of the second rotor core (8), which abuts the adjacent rotor plate (2) of the first rotor core (8), formed as a hole exemption (9) is present, the inner diameter so on a majesty (7) of the rotor plate (2) of the first rotor laminated core (8) is matched, that there is a force and / or positive connection between them. 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. Rotor (1) according to one of Claims 3 to 6 , characterized in that the passages (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 holding the permanent magnets (3) in the circumferential direction around a Angle (α) are offset from each other. Rotor (1) according to Claim 7 , characterized in that the holding means include recesses in the respective rotor laminations (2). Electric machine with a rotor (1) according to one of the preceding claims. Method for producing a rotor (1) for an electric machine, in which at least two rotor laminations (2) of a plurality of rotor laminations (2) designed for holding permanent magnets (3) are at least rotationally fixedly anchored to one another in a first production step, wherein recesses (5) having recesses (6) on one side of the rotor lamination (2) and top surfaces (7) on the other side of the rotor lamination (2) are connected to each other, the recesses (6) and sublime (7) being dimensioned are matched to each other for attachment to each other.

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