DE102022206623A1 - Improved fixation of rotor magnets in a rotor of an electrical machine - Google Patents

Abstract

A rotor (3, 3a) for an electrical machine (1) is specified with a rotor laminated core (11, 11 a..11 g), which comprises a plurality of rotor laminations (10, 10a..10c) stacked on top of each other, which have receiving areas (15a. .15e) for rotor magnets (12, 12a, 12b). Some of the rotor plates (10, 10a...10c) have extensions (16) that protrude into the receiving areas (15a...15e). The rotor (3, 3a) also comprises a plurality of rotor magnets (12, 12a, 12b) arranged in the receiving areas (15a..15e), which have recesses (17, 18) into which the extensions (16) protrude, so that a positive connection of the rotor laminated core (11, 11 a..11 g) with the rotor magnets (12, 12a, 12b) is formed. Furthermore, an electrical machine (1) is specified, which has a stator (5) and a rotor (3, 3a) rotatably mounted therein, as well as a vehicle (20) with such an electrical machine (1). In addition, methods for producing a rotor (3, 3a) for an electrical machine (1) of the type mentioned are specified.

Description

TECHNICAL FIELD

The invention relates to a rotor for an electrical machine with a rotor laminated core with a plurality of rotor laminations stacked on top of one another and a plurality of rotor magnets. The stacked rotor laminations or recesses or holes provided therein form receiving areas for the rotor magnets, for example in the form of free spaces, which can penetrate the rotor lamination stack axially. Furthermore, some of the rotor laminations can have extensions that protrude into the receiving areas. Furthermore, the invention relates to an electrical machine with a stator and a rotor of the type mentioned above which is rotatably mounted with respect to the stator. The invention also relates to a vehicle with a drive train which has an electrical machine of the type mentioned, which is intended to drive the vehicle . Finally, the invention relates to a method for producing a rotor for an electrical machine.

STATE OF THE ART

A rotor, an electrical machine, a vehicle and a method for producing a rotor are basically known from the prior art. The rotor is, for example, a permanently excited rotor in which the rotor magnetic field is generated by several rotor magnets arranged in the rotor laminated core. In order to fix the rotor magnets in the rotor, the rotor laminations often have extensions that rest against the rotor magnets and hold the rotor magnets axially due to friction. The frictional force essentially serves to fix the rotor magnets during the production of the rotor, but is generally not large enough to permanently fix them in the rotor laminated core, even in the event of vibrations occurring in an electrical machine. Therefore, the rotor magnets can come loose during operation of the electrical machine and damage it. The rotor magnets are therefore often additionally cast with a resin in the rotor laminated core in order to permanently fix them in the rotor laminated core. The disadvantage of this process is that it is technically complex and expensive. In addition, cracks often form in the cured resin, which can cause resin fragments to come loose and damage the electrical machine.

DISCLOSURE OF INVENTION

It is therefore an object of the invention to provide an improved rotor, an improved electric machine, an improved vehicle and an improved method for manufacturing a rotor. In particular, the production of a rotor should be simplified and thus be carried out more cost-effectively without impairing the operational safety of the associated electrical machine.

The object of the invention is achieved with a rotor of the type mentioned at the outset, in which the rotor magnets have recesses into which the extensions of the rotor laminations protrude, so that a positive connection of the rotor lamination stack with the rotor magnets is formed.

Furthermore, the object is achieved by an electrical machine with a stator and a rotor of the type mentioned above which is rotatably mounted with respect to the stator.

The object of the invention is also achieved with a vehicle with a drive train which has an electric machine of the type mentioned, which is intended to drive the vehicle.

The proposed measures allow the rotor magnets to be securely fixed in the rotor laminated core, so that additional fixation with resin is no longer necessary. This simplifies the production of the rotor and can therefore be carried out more cost-effectively without impairing the operational safety of the associated electrical machine due to resin splinters.

It is advantageous if the extensions are designed to be resilient, for example elastic or elastic-plastic. As a result, the extensions can deform during the production of the rotor and snap into the recesses of the rotor magnets, so that the said positive connection of the rotor laminated core with the rotor magnets is formed. For example, the extensions can be formed by punching the rotor laminations.

• - Herstellen eines Rotorblechpakets durch Aufeinanderstapeln von mehreren Rotorblechen, welche Aufnahmebereiche für Rotormagnete ausbilden, wobei einige der Rotorbleche Fortsätze aufweisen, die in die Aufnahmebereiche hineinragen und
• - Einschieben von Rotormagneten in die Aufnahmebereiche, wobei die Fortsätze in Vertiefungen der Rotormagnete einrasten, so dass eine formschlüssige Verbindung des Rotorblechpakets mit den Rotormagneten gebildet wird.

A method for producing a rotor for an electrical machine may include the following steps:

• - Producing a rotor lamination stack by stacking several rotor laminations on top of each other, which form receiving areas for rotor magnets, some of the rotor laminations having extensions which protrude into the receiving areas and
• - Inserting rotor magnets into the receiving areas, whereby the extensions snap into recesses in the rotor magnets, so that a positive connection of the rotor laminated core with the rotor magnets is formed.

In this embodiment variant, the rotor laminated core is first produced and then the rotor magnets are inserted into the receiving areas. The rotor laminated core can advantageously already form a rigid body when the rotor magnets are mounted. Undesirable deformation of the rotor laminated core can thereby be largely eliminated or at least significantly reduced.

• - Bereitstellen von Rotormagneten,
• - Bereitstellen mehrerer Rotorbleche, die Aufnahmebereiche für Rotormagnete ausbilden, wobei einige der Rotorbleche Fortsätze aufweisen, und
• - Herstellen eines Rotorblechpakets durch Aufschieben der Rotorbleche auf die Rotormagnete, wobei die Rotorbleche aufeinandergestapelt werden und die Fortsätze in Vertiefungen der Rotormagnete einrasten, so dass eine formschlüssige Verbindung des Rotorblechpakets mit den Rotormagneten gebildet wird.

An alternative method for producing a rotor for an electrical machine can also have the following steps:

• - Providing rotor magnets,
• - Providing several rotor laminations that form receiving areas for rotor magnets, some of the rotor laminations having extensions, and
• - Producing a rotor lamination stack by pushing the rotor laminations onto the rotor magnets, whereby the rotor laminations are stacked on top of one another and the extensions snap into recesses in the rotor magnets, so that a positive connection of the rotor lamination stack with the rotor magnets is formed.

In this embodiment variant, the rotor lamination stack is formed step by step by pushing the rotor laminations onto the rotor magnets. Advantageously, in this embodiment variant, no space needs to be provided in the rotor laminated core for the deformation of the extensions. Instead, the rotor magnets can sit in the rotor laminated core with no play or only a small amount of play.

Further advantageous refinements and developments of the invention result from the subclaims and from the description in conjunction with the figures.

It is advantageous if the extensions are arranged radially on the inside in the receiving areas. This means that the rotor magnets can be kept free of depressions in the radially outer area, which means that the magnetic field in the area of the air gap between the rotor and stator is not influenced.

It is advantageous if the rotor magnets are pressed by the extensions or using them against a radially outer boundary wall of the receiving areas. As a result, the rotor magnet is fixed particularly well in its receiving area, as a centrifugal force acting during operation further supports this effect.

It is advantageous if the recesses in the rotor magnet are designed as continuous grooves. On the one hand, this makes the depressions easy to produce, and on the other hand, the rotor magnet can be used for many laterally different positions of extensions.

However, it is also advantageous if the recesses in the rotor magnets are pocket-shaped or trough-shaped. As a result, the rotor magnetic field is only slightly influenced by the depressions because they are relatively small. In addition, the rotor magnet can be fixed with such recesses not only axially, but also in the transverse direction.

It is advantageous if the rotor magnets are cast with a casting compound in the receiving areas. This means that the rotor magnets are fixed even better in the rotor laminated core.

However, it is also advantageous if the receiving areas are free of potting compound. This significantly simplifies the production of a rotor and is therefore even more cost-effective.

BRIEF DESCRIPTION OF THE FIGURES

• 1 eine beispielhafte und schematisch im Halbschnitt dargestellte elektrische Maschine;
• 2 ein beispielhaftes Rotorblechpaket in Schrägansicht;
• 3 eine Detailansicht des Rotorblechpakets aus 2;
• 4 wie 3, jedoch mit eingesetztem Rotormagneten;
• 5 einen beispielhaften Rotormagneten mit Nuten von schräg unten gesehen;
• 6 einen beispielhaften Rotormagneten mit mulden- beziehungsweise taschenförmigen Vertiefungen von schräg unten gesehen;
• 7 eine beispielhafte Ausführungsform eines Rotorblechpakets beim Einschieben eines Rotormagneten im Längsschnitt;
• 8 wie 7, jedoch mit dem Rotormagneten in Endposition;
• 9 ein Rotorblechpaket mit lokal begrenzten Ausnehmungen für die Fortsätze beim Einschieben eines Rotormagneten im Längsschnitt;
• 10 wie 9, jedoch mit dem Rotormagneten in Endposition;
• 11 ein Rotorblechpaket mit nutenförmigen Ausnehmungen für die Fortsätze mit dem Rotormagneten in Endposition im Längsschnitt;
• 12 wie 11, jedoch mit verringertem Spiel zwischen Rotormagnet und Rotorblechpaket;
• 13-15 Schritte bei einem Herstellungsverfahren, bei dem die Rotorbleche auf die Rotormagnete aufgeschoben werden;
• 16 einen Längsschnitt durch einen Rotor, welcher mit dem in 13-15 illustrierten Verfahren hergestellt ist;
• 17 wie 11, jedoch mit einem Rotormagnet, der im Rotorblechpaket vergossen ist, und
• 18 ein beispielhaftes Fahrzeug mit einer elektrischen Maschine mit einem Rotorblechpaket der vorgeschlagenen Art.

Embodiments of the invention are shown as examples in the attached schematic figures. Show it:

• 1 an exemplary electrical machine shown schematically in half section;
• 2 an exemplary rotor laminated core in an oblique view;
• 3 a detailed view of the rotor lamination stack 2 ;
• 4 How 3 , but with rotor magnet inserted;
• 5 an exemplary rotor magnet with grooves seen obliquely from below;
• 6 an exemplary rotor magnet with trough-shaped or pocket-shaped depressions seen obliquely from below;
• 7 an exemplary embodiment of a rotor laminated core when a rotor magnet is inserted in a longitudinal section;
• 8th How 7 , but with the rotor magnet in the end position;
• 9 a rotor laminated core with locally limited recesses for the extensions when inserting a rotor magnet in a longitudinal section;
• 10 How 9 , but with the rotor magnet in the end position;
• 11 a rotor laminated core with groove-shaped recesses for the extensions with the rotor magnet in the end position in longitudinal section;
• 12 How 11 , but with reduced play between the rotor magnet and the rotor laminated core;
• 13-15 Steps in a manufacturing process in which the rotor laminations are pushed onto the rotor magnets;
• 16 a longitudinal section through a rotor, which is connected to the in 13-15 illustrated method is produced;
• 17 How 11 , but with a rotor magnet that is cast in the rotor laminated core, and
• 18 an exemplary vehicle with an electric machine with a rotor laminated core of the proposed type.

DETAILED DESCRIPTION OF THE INVENTION

At the outset, it should be noted that the same parts in the different embodiments are provided with the same reference numbers or component names, if necessary with different indices. The disclosure of a component contained in the description can be transferred analogously to another component with the same reference number or the same component name. The position information chosen in the description, such as “top”, “bottom”, “back”, “front”, “side” and so on, is also related to the figure directly described and shown and, if the position changes, correspondingly to the new one Transfer location.

1 shows a half section through a schematically illustrated electrical machine 1. The electrical machine 1 comprises a rotor shaft 2 with a rotor 3 seated thereon, the rotor shaft 2 being rotated around a rotor axis or axis of rotation A relative to a stator with the aid of (rolling) bearings 4a, 4b 5 is rotatably mounted. Specifically, the first bearing 4a sits in a first front end shield 6 and the second bearing 4b in a second, rear end shield 7. Furthermore, the electrical machine 1 comprises a middle housing part 8, which connects the front end shield 6 and the rear end shield 7 and the stator 5 records. In this example, the front end shield 6, the rear end shield 7 and the housing part 8 form the housing 9 of the electrical machine 1. The rotor 3 comprises a plurality of stacked and interconnected rotor laminations 10, which together form a rotor lamination stack 11. In addition, the rotor 3 includes rotor magnets 12 arranged in the rotor laminated core 11. The stator 5 includes a stator laminated core 13, not shown in detail, as well as stator windings 14 arranged in the stator laminated core 13. It should be noted at this point that a housing 9, which contains the rotor 3 and the stator 5 completely enclosing is not mandatory and the electrical machine 1 can also be manufactured in an open design.

2 shows an exemplary rotor laminated core 11a in an oblique view, and 3 shows a detailed view of the upper area of the rotor laminated core 11a. The rotor laminated core 11a has a shaft bore B, as well as several receiving areas 15a..15c for rotor magnets 12, which are formed by the rotor laminated core 11 or the rotor laminations 10. The individual rotor laminations 10 are in the 2 and 3 not shown separately from each other. Instead, the rotor laminated core 11a is in the 2 and 3 simplified shown as a full body. In the 3 However, it can be seen that some of the rotor laminations have extensions 16 which protrude into the receiving areas 15a..15c. The extensions 16 can be formed, for example, by punching the rotor laminations 10.

4 shows the arrangement 3 now with a rotor magnet 12a, which was inserted into the receiving area 15a. 5 shows a view of the rotor magnet 12a obliquely from below. The rotor magnet 12a has depressions 17, which in the specific example are formed by grooves and into which the extensions 16 protrude when the rotor magnet 12a is mounted. This creates a positive connection between the rotor laminated core 11a and the rotor magnet 12a.

In the 4 only the rotor magnet 12a is inserted into the receiving area 15a. However, for the sake of completeness, it should be noted that the other receiving areas 15b, 15c are also occupied with rotor magnets 12 during the production of the rotor 3a.

In the 3 It can also be seen that the rotor laminations 10 or the rotor lamination stack 11 have/has optional recesses C. These provide space for the extensions 16 if they are bent when the rotor magnet 12a is inserted (see also 12 ).

In the present example, the extensions 16 are designed to be resilient. As a result, after inserting the rotor magnet 12a, they spring back into its grooves 17 when the rotor magnet 12a has reached its final position after the insertion process. In other words, the extensions 16 snap into the grooves 17 of the rotor magnet 12a, so that a positive connection is formed between the rotor laminated core 11a and the rotor magnet 12a.

In the present example, the extensions 16 are arranged radially inwards in the receiving areas 15a..15c. The rotor magnets 12a are advantageously pressed by the extensions 16 onto a radially outer boundary wall of the receiving areas 15a..15c.

6 shows a view of an alternative embodiment of a rotor magnet 12b obliquely from below. In contrast to the rotor magnet 12a, the rotor magnet 12b has depressions 18 which are pocket-shaped or trough-shaped. However, the interaction with the extensions 16 is the same as in 5 shown rotor magnet 12a. Specifically, in the assembled state of the rotor magnet 12b, the extensions 16 protrude into the pocket-shaped or trough-shaped recesses 18, which in turn forms a positive connection of the rotor laminated core 11a with the rotor magnet 12b.

The 7 until 17 now show sectional views of various rotor laminated cores 11b..11g, partly during the manufacturing process or when inserting a rotor magnet 12a.

This shows specifically 7 a rotor lamination package 11b, which is made with two different types of rotor laminations 10a, 10b. A rotor plate 10a of a first type, in contrast to a rotor plate 10b of a second type, has extensions 16 which protrude into the receiving area 15d. 7 shows a state in which the rotor magnet 12a is being inserted into the receiving area 15d in the axial direction. It is clearly visible that the extensions 16 are bent over here. 8th shows the rotor laminated core 11b 7 now in a state in which the rotor magnet 12a has reached its final position and the extensions 16 have spring back and protrude into the recesses 17 of the rotor magnet 12 and in this way form a positive connection of the rotor laminated core 11b with the rotor magnet 12a. In the 8th It is also clearly visible that the rotor magnet 12a is pressed by the extensions 16 against a radially outer boundary wall of the receiving area 15d.

9 shows an embodiment of a rotor laminated core 11c, which is the rotor laminated core 11b 7 is very similar. In contrast to this, the rotor lamination stack 11c is made up of three different types of rotor laminations 1 0a..1 0c. Specifically, dedicated pockets or recesses D are formed in the rotor laminated core 11c, which provide space for the extensions 16 that are deformed when the rotor magnet 12a is inserted. Advantageously, the recesses D are only large enough to accommodate the extensions 16. The magnetic flux in the rotor laminated core 11c is therefore only slightly disturbed by the recesses D. 10 shows the rotor laminated core 11c 9 again in a state in which the rotor magnet 12a has reached its final position and the extensions 16 have spring back and protrude into the recesses 17 of the rotor magnet 12a and in this way form a positive connection of the rotor laminated core 11c with the rotor magnet 12a. In the 10 It is again clearly visible that the rotor magnet 12a is pressed by the extensions 16 against a radially outer boundary wall of the receiving area 15e.

11 shows a further embodiment of a rotor laminated core 11d, which is the rotor laminated core 11c 10 is very similar. In contrast, the rotor laminated core 11d has groove-shaped recesses C for the extensions 16. The 11 again shows the rotor magnet 12a in the assembled state.

12 shows a further embodiment of a rotor laminated core 11e, which is the rotor laminated core 11d 11 is very similar. In contrast, there is little or no play under the rotor magnet 12a. In the 12 The embodiment shown therefore largely corresponds to that in the 2 until 4 illustrated embodiment of the rotor laminated core 11a.

In the previous examples it was assumed that the rotor laminated core 11a..11e is produced first and only then are the rotor magnets 12, 12a, 12b inserted into the receiving areas 15a..15e.

• - Herstellen eines Rotorblechpakets 11, 11a..11e durch Aufeinanderstapeln von mehreren Rotorblechen 10, 10a..10c, welche Aufnahmebereiche 15a..15e für Rotormagnete 12, 12a, 12b ausbilden, wobei einige der Rotorbleche 10, 10a..10c Fortsätze 16 aufweisen, die in die Aufnahmebereiche 15a..15e hineinragen und
• - Einschieben von Rotormagneten 12, 12a, 12b in die Aufnahmebereiche 15a..15e, wobei die Fortsätze 16 in Vertiefungen 17, 18 der Rotormagnete 12, 12a, 12b einrasten, so dass eine formschlüssige Verbindung des Rotorblechpakets 11, 11a.. 11g mit den Rotormagneten 12, 12a, 12b gebildet wird.

A method for producing a rotor 3, 3a for an electrical machine 1 can therefore have the following steps:

• - Producing a rotor lamination stack 11, 11a...11e by stacking several rotor laminations 10, 10a...10c, which form receiving areas 15a...15e for rotor magnets 12, 12a, 12b, some of the rotor laminations 10, 10a...10c having extensions 16 , which protrude into the recording areas 15a..15e and
• - Inserting rotor magnets 12, 12a, 12b into the receiving areas 15a..15e, the extensions 16 engaging in recesses 17, 18 of the rotor magnets 12, 12a, 12b, so that a positive connection of the rotor laminated core 11, 11a.. 11g with the Rotor magnets 12, 12a, 12b is formed.

• - Bereitstellen von Rotormagneten 12, 12a, 12b,
• - Bereitstellen mehrerer Rotorbleche 10, 10a..10c, wobei einige der Rotorbleche 10, 10a.. 10c Fortsätze 16 aufweisen, und
• - Herstellen eines Rotorblechpakets 11, 11a..11g durch Aufschieben der Rotorbleche 10, 10a.. 10c auf die Rotormagnete 12, 12a, 12b, wobei die Rotorbleche 10, 10a..10c aufeinandergestapelt werden, so dass Aufnahmebereiche 15a..15e für die Rotormagnete 12, 12a, 12b gebildet werden, und die Fortsätze 16 in Vertiefungen 17, 18 der Rotormagnete 12, 12a, 12b einrasten, so dass eine formschlüssige Verbindung des Rotorblechpakets 11, 11a..11 g mit den Rotormagneten 12, 12a, 12b gebildet wird.

But this is not the only possible approach. A process that has the following steps is also conceivable:

• - Providing rotor magnets 12, 12a, 12b,
• - Providing several rotor laminations 10, 10a...10c, some of the rotor laminations 10, 10a...10c having extensions 16, and
• - Producing a rotor lamination stack 11, 11a...11g by pushing the rotor laminations 10, 10a...10c onto the rotor magnets 12, 12a, 12b, the rotor laminations 10, 10a...10c being stacked on top of each other, so that receiving areas 15a...15e for the Rotor magnets 12, 12a, 12b are formed, and the extensions 16 engage in recesses 17, 18 of the rotor magnets 12, 12a, 12b, so that a positive connection of the rotor laminated core 11, 11a..11g with the rotor magnets 12, 12a, 12b is formed becomes.

The 13 until 16 show an example of this. 13 shows the arrangement in a state in which a rotor magnet 12a has been provided and a rotor plate 10b is pushed on. In the 14 the rotor plate 10b has reached its final position. 15 shows the arrangement in a state in which three rotor plates 10b have already been pushed onto the rotor magnet 12a and stacked on top of one another and in which another rotor plate 10a with an extension 16 is currently being pushed onto the rotor magnet 12a. 16 shows the completely manufactured rotor laminated core 11f with the fully assembled rotor magnet 12a. From the 16 It is clearly visible that in this manufacturing process no receiving areas C or D have to be provided and the rotor magnet 12a sits in the rotor laminated core 11f with little or no play. This is possible because the extensions 16 are bent into an area in which there is no further rotor plate 10b, as shown in FIG 15 is shown.

In the examples described so far, the receiving areas 15a...15e are free of a casting compound. But this is not the only conceivable possibility. This shows as a representative 17 a rotor laminated core 11g, which corresponds to the rotor laminated core 11e 12 is similar. In contrast to this, the rotor magnet 12a is cast with a casting compound 19 in the relevant receiving area 15a...15e. Of course, this measure does not only apply to the 17 illustrated embodiment, but can also be used in all previously described embodiments.

The 18 finally shows the electric machine 1 installed in a vehicle 20. The vehicle 20 has two axles, one of which is driven. Specifically, the electric machine 1 is connected to the semi-axles 22 of the rear axle via an optional transmission 21. Finally, the driven wheels 23 are mounted on the semi-axles 22. The electric machine 1, the transmission 21 and the semi-axles 22 are part of the drive train of the vehicle 20. The vehicle 20 is driven at least partially or temporarily by the electric machine 1. This means that the electric machine 1 can be used to drive the vehicle alone 20 serve or, for example, be provided in combination with an internal combustion engine (hybrid drive).

Finally, it is noted that the scope of protection is determined by the patent claims. However, the description and drawings must be used to interpret the claims. The features contained in the figures can be exchanged and combined with one another as desired. In particular, it is also noted that the devices shown can in reality also include more or fewer components than shown. In some cases, the devices shown or their components can also be shown out of scale and/or enlarged and/or reduced in size.

Reference symbol list

1

electric machine

2

Rotor shaft

3, 3a

rotor

4a, 4b

(Roller bearing

5

stator

6

front end shield

7

rear end shield

8th

(middle) housing part

9

Housing

10, 10a..10c

rotor plate

11, 11a..11g

Rotor lamination package

12, 12a, 12b

Rotor magnet

13

Stator lamination package

14

Stator winding

15a..15e

Recording area for rotor magnet

16

appendage

17

groove (recess)

18

pocket (recess)

19

Potting compound

20

vehicle

21

transmission

22

semi-axis

23

wheel

A

Axis of rotation

b

shaft bore

C

recess

D

recess

Claims (13)

Rotor (3, 3a) for an electrical machine (1), comprising - a rotor laminated core (11, 11a..11g) with a plurality of rotor laminations (10, 10a.. 10c) stacked on top of each other, which form receiving areas (15a..15e) for rotor magnets , some of the rotor plates (10, 10a..10c) having extensions (16) which protrude into the receiving areas (15a..15e) and - several rotor magnets (12, 12a, 12b) arranged in the receiving areas (15a..15e). ), characterized in that - the rotor magnets (12, 12a, 12b) have recesses (17, 18) into which the extensions (16) protrude, so that a positive connection of the rotor laminated core (11, 11a.. 11g) with the Rotor magnet (12, 12a, 12b) is formed. Rotor (3, 3a). Claim 1 , characterized in that the extensions (16) are designed to be resilient. Rotor (3, 3a). Claim 1 or 2 , characterized in that the extensions (16) are arranged radially inwards in the receiving areas (15a..15e). Rotor (3, 3a) according to the Claims 2 and 3 , characterized in that the rotor magnets (12, 12a, 12b) are pressed by the extensions (16) against a radially outer boundary wall of the receiving areas (15a..15e). Rotor (3, 3a) according to one of the Claims 1 until 4 , characterized in that the depressions (17, 18) in the rotor magnets (12, 12a, 12b) are designed as continuous grooves (17). Rotor (3, 3a) according to one of the Claims 1 until 4 , characterized in that the depressions (17, 18) in the rotor magnets (12, 12a, 12b) are pocket-shaped or trough-shaped. Rotor (3, 3a) according to one of the Claims 1 until 6 , characterized in that the rotor magnets (12, 12a, 12b) are cast in the receiving areas (15a..15e) with a casting compound (19). Rotor (3, 3a) according to one of the Claims 1 until 6 , characterized in that the receiving areas (15a..15e) are free of a casting compound (19). Electrical machine (1), comprising - a stator (5) and - a rotor (3, 3a) rotatably mounted with respect to the stator (5) according to one of Claims 1 until 8th . Vehicle (20) with a drive train that has an electric machine (1). Claim 9 which is intended to drive the vehicle (20). Method for producing a rotor (3, 3a) for an electrical machine (1), comprising the steps - Producing a rotor lamination stack (11, 11 a..11 g) by stacking several rotor laminations (10, 10a..10c), which form receiving areas (15a..15e) for rotor magnets (12, 12a, 12b), some of which Rotor laminations (10, 10a..10c) have extensions (16) which protrude into the receiving areas (15a..15e) and - Inserting rotor magnets (12, 12a, 12b) into the receiving areas (15a..15e), whereby the extensions (16) snap into recesses (17, 18) of the rotor magnets (12, 12a, 12b), so that a positive connection of the rotor laminated core (11, 11 a..11g) is formed with the rotor magnets (12, 12a, 12b). Method for producing a rotor (3, 3a) for an electrical machine (1), comprising the steps - Providing rotor magnets (12, 12a, 12b), - Providing several rotor laminations (10, 10a...10c), some of the rotor laminations (10, 10a...10c) having extensions (16), and - Producing a rotor lamination stack (11, 11 a..11 g) by pushing the rotor laminations (10, 10a..10c) onto the rotor magnets (12, 12a, 12b), the rotor laminations (10, 10a..10c) being stacked on top of each other , so that receiving areas (15a..15e) for the rotor magnets (12, 12a, 12b) are formed, and the extensions (16) snap into recesses (17, 18) of the rotor magnets (12, 12a, 12b), so that a positive connection of the rotor laminated core (11, 11a..11 g) with the rotor magnets (12, 12a, 12b) is formed. Procedure according to Claim 11 or 12 , in which the extensions (16) are formed by punching the rotor laminations (10, 10a..10c).

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