WO2008092748A1

WO2008092748A1 - Electrical machine

Info

Publication number: WO2008092748A1
Application number: PCT/EP2008/050496
Authority: WO
Inventors: Karl-Juergen Roth; Ngoc-Thach Nguyen; Tilo Koenig; Bruno Holzwarth; Christian Arens
Original assignee: Robert Bosch Gmbh
Priority date: 2007-02-01
Filing date: 2008-01-17
Publication date: 2008-08-07
Also published as: DE102007029719A1; EP2115855A1

Abstract

The invention relates to an electrical machine which can be embodied as an electric motor, having a rotor (3). The rotor (3) comprises a plurality of plates (1) forming a plate assembly (2). Recesses (10) are provided in the plate assembly (2) with magnets (4) being inserted therein. Furthermore, resilient lugs (11) are formed at the plates (1). A part of the resilient lugs (11) causes a radial positioning and attachment of the magnets (4) while another part of the resilient lugs (14) causes a tangential positioning and attachment of the magnets (4).

Description

description

title

Electric machine

State of the art

The invention relates to an electrical machine, in particular an electric motor with a rotor and a stator. Specifically, the invention relates to the field of electric motors for motor vehicles, in particular serving as electrical auxiliary drives electric motors for power-operated adjustment or the support of an adjustment of elements of a motor vehicle.

From DE 195 23 789 Al an electric motor with a rotor, a stator and other components is known, which are housed in a housing of the electric motor. On the stator are several stator windings on a stator core. Further, the rotor is fixedly mounted on a shaft of the electric motor. In operation, the control current to the various stator windings on the armature of the

Stators controlled by means of a control circuit so that there is a rotating magnetic field inside the motor. This will then take the rotor with you. For this purpose, four rotor magnets are provided, which are mounted in a rotor housing so that the inner peripheral surfaces of the

Rotor magnets lie exactly opposite an outer circumferential surface of the stator core.

The known from DE 195 23 789 Al electric motor has the Disadvantage that the attachment of the rotor magnets in the

Rotor housing can only be done with limited accuracy. This has an unfavorable effect on the operating behavior of the known electric motor.

It is conceivable that the rotor is composed of one or more disk packs or individual laminations and other components. The lamellae or disk packs can be pushed axially onto a shaft, so that they immediately adjoin one another. The individual disks, for example a disk set, can be produced by stamping, wherein the individual disks can be packaged after punching to form a disk package. When punching also recesses can be achieved, which add to the disk pack to pockets in which magnets are present in the mounted state of the rotor, that is buried. In electrical machines, such as synchronous motors, it is conceivable that magnets are inserted into the pockets, wherein a fixing of the magnets is done by gluing. However, both the pockets and the magnets usually have a manufacturing tolerance. Since it must be ensured that the magnets fit into the pockets during insertion during assembly, the sum of the manufacturing tolerances must be kept in the sizing. This means that the magnets are installed with clearance fit. A tangential orientation of the magnets is then limited. By a game between magnet and bag in the tangential direction, however, the problem arises that a cogging torque of the motor is increased. Such a cogging torque causes unsteady running, especially at low rotational frequencies. A high cogging torque can cause, for example, in engines that are used to support the steering movement in motor vehicles, that the driver feels a jerk on the steering wheel with slow movement of the steering wheel. To reduce one such cogging torque is a manual centering of the

Magnets in tangential direction possible. For example, very soft parts could be placed on either side of the magnet, for example made of paper. However, such a manual centering represents an extremely high cost in the production of electrical machine.

Disclosure of the invention

The electric machine according to the invention with the features of claim 1 has the advantage that a reliable and relatively inexpensive to bewerkstelligende positioning of the magnets in the rotor is made possible. Specifically, an accurate tangential positioning of the magnets can be done relative to the disk packs to reduce a cogging torque of the electric machine.

The measures listed in the dependent claims advantageous developments of the specified in claim 1 electric machine are possible.

The electric machine has at least two magnets. Of the magnets of the electric machine at least one is arranged in a recess according to claim 1.

It is advantageous that the resilient projection of the blade is biased for at least indirect attachment of the magnet in the recess in a tangential direction. The lamella can be designed so that an elastic deformation of the resilient approach is required for introducing the magnet into the recess. As a result, on the one hand, an attachment of the magnet is achieved in the recess, which is already sufficient, depending on the particular application, to the magnet to fix. Separate fasteners, the use of adhesives or the like, is then not required. On the other hand, a defined position of the magnet in the radial direction can be specified by the bias in the tangential direction.

Advantageously, the resilient lug for biasing the magnet in the recess is biased in a radial direction. In this way, on the one hand, an attachment of the magnet in the recess can be achieved, which does not require the additional use of fasteners or adhesives depending on the particular application. On the other hand can be specified by the bias a defined position in the radial direction.

It should be noted that a plurality of resilient lugs may also be provided, of which one part is biased substantially in a tangential direction and another part is biased at least substantially in a radial direction. In addition, embodiments are conceivable in which a resilient approach is biased both in the radial direction and in the tangential direction. Such resilient approaches can be provided on mutually different slats of a disk pack or on the same lamella.

It is advantageous that resilient lugs are formed on a plurality of lamellae of the lamella packet, wherein at least a part of the resilient lugs of the lamellae is arranged one behind the other in an axial direction. This ensures that accumulate the holding forces of the resilient lugs, whereby a reliable attachment is achieved even at relatively high loads. Furthermore, it is advantageous that an intermediate space is provided between one, two or even a plurality of resilient projections arranged one behind the other. Through the gap a certain bending of the resilient projections when inserting the magnet is made possible in the recess. This facilitates the mounting of the magnet in the recess. In addition, thereby the resilient lugs can be configured so that they protrude relatively far into the space required by the magnet to be inserted, whereby already one of the resilient lugs exerts a relatively large holding force.

Furthermore, it is advantageous that one or more fins are provided on the end faces of the disk pack, which have no resilient lugs. This prevents mounting due to resilient approaches on the

Beyond the end faces of the disk pack, which could affect the mounting of attachments, the flat concerns of the disk pack on an attachment or the arrangement of several consecutive disk packs.

It is advantageous that the resilient projections are configured bow-shaped or nose-shaped. This embodiment is relatively easy to produce in the context of a stamping process and also allows an advantageous deflection.

Furthermore, it may be advantageous depending on the particular application, when the magnet is connected by means of an adhesive with the resilient approach. As a result, the attachment is further enhanced, so that the magnet is reliably positioned even in relation to large loads occurring.

Brief description of the drawings Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are provided with corresponding reference numerals. 1 shows a lamella of a disk set of a rotor of an electric machine according to a first embodiment of the invention;

Fig. 2, the blade shown in Figure 1 according to a second embodiment.

Fig. 3 arranged one behind the other slats in an excerpted representation corresponding to the designated in Fig. 2 with III section.

4 shows the blade shown in Figure 1 according to a third embodiment ..;

5 shows the blade shown in Figure 1 according to a fourth embodiment ..;

Fig. 6, the blade shown in Figure 1 according to a fifth embodiment.

7 shows the blade shown in Figure 1 according to a sixth embodiment ..;

8 shows the blade shown in FIG. 1 in accordance with a seventh embodiment; FIG.

9 shows the blade shown in Figure 1 according to an eighth embodiment ..;

Fig. 10 corresponding to the slat shown in Fig. 1 a ninth embodiment;

11 shows a terminating or intermediate plate of a plate pack of a rotor of an electrical machine;

12 is a simplified representation of a packet of laminations packetized from a plurality of slats in an excerpted sectional view along the in Fig. 10 denoted by XII section line for further illustrating an embodiment of the invention and

Fig. 13 a plate pack of an electric machine with inserted magnets.

Description of the embodiments

1 shows a lamella 1 of a lamella packet 2 of a rotor 3 (FIG. 13) of an electrical machine. In the rotor 3 while several magnets 4 are used, as shown in FIG. 13. To simplify the illustration, only the magnet 4 is shown in FIG. 13. The electric machine can be designed in particular as an electric motor for a motor vehicle. In particular, the electric machine is suitable for power-operated adjustment of elements of a motor vehicle, for example a sunroof, a window or a seat element. Furthermore, the electric machine can serve as an electric motor for steering power assistance. However, the electric machine according to the invention is also suitable for other applications.

It should be noted that the lamellae 1 of a lamella packet 2 can be designed differently. Various design options are based on the below described embodiments explained. In this case, there are particular advantages due to the different design of a plurality of lamellae 1 packetized to form a lamella packet 2. With regard to the particular application, then the appropriate design of the plate package 2 can be selected.

The blade 1 shown in FIG. 1 has a central, circular recess 5. The recess 5 allows the application of the blade 1 to a shaft of the electric machine. The slats 1 can be individually added to the shaft. It is also possible that the lamellae 1 are first packaged to form a lamella packet 2 which is placed on the shaft as a whole. Furthermore, the lamella 1 has a plurality of punched-out sections 6, which serve for weight reduction. Furthermore, the slat 1

Recesses 10A, 10B, which serve to receive the magnets 4. In this case, the lamella 1 has two different types of recesses 10, namely recesses, which are designed according to the recess 10A, and recesses, which are designed according to the recess 10B. In the recess 10A, a resilient projection 11 is formed on the lamella 1, which is designed näschenförmig. The resilient projection 11 protrudes slightly into the area that is required by the magnet 4. When inserting the magnet 4 in the recess 10A, therefore, there is an elastic deformation of the resilient lug 11. This elastic deformation causes a bias of the resilient lug 11 in a radial direction, the magnet 4 against a side surface 12 of the lamella 1 with an in acting radially acting holding force. By the side surface 12 while the radial position of the magnet 4 is predetermined. The centrifugal forces occurring on the magnet 4 when rotating the rotor 3 act in the same direction as the resilient projection 11, whereby no relative movement to the plate pack 2 occurs.

The recess IOB has instead of a resilient projection 11 on a void 13. In the packaging of the slats 1 to the disk set 2 some slats 1 are arranged so that a recess 10B is located with a void 13 behind a recess 10A with a resilient projection 11. For example, the recesses 10A, 10B of a plurality of fins 1 may alternate in an axial direction. Through the void 13, the compression of the resilient lugs 11 is favored. It can be influenced by the depth of the void 13, the rigidity of the resilient lugs 11.

The resilient lugs 11 and the voids 13 are arranged in the center of the respective recess 10A, 10B, whereby the magnetic flux is disturbed only slightly. A further reduction in the disturbance of the magnetic flux through the resilient lugs 11 and the voids 13 can be achieved in that the resilient lugs 11 and the voids 13 are made so small that the

Holding force of the resilient lugs 11 just sufficient to hold the magnets 4 in position.

Fig. 2 shows another possible embodiment of a blade 1 according to a second embodiment of the invention. In this embodiment, the recesses 10 are all configured the same. The recesses 10 all have an empty space 13, as corresponds to the recess 10B shown in FIG. In addition, the recesses 10 each have a resilient projection 14, which allows positioning of a magnet 4 used in each case in the recess 10 in a tangential direction. The resilient projection 14 is configured bow-shaped. The lamella 1 is applied to the shaft 15 and suitably connected to it, for example by a cylindrical press assembly.

The illustrated embodiment, in which exactly one resilient lug 14 for positioning in a tangential direction is provided in each recess, has the advantage that the space available on the lamella 1 can essentially serve to accommodate the magnets 4. Thus, a certain space savings is achieved. It is also advantageous that a bulbous bulge 17 is provided on one side of the recess 10, which is the resilient

Approach 14 is opposite. Through the bulbous bulge 17 a defined positioning of the magnet 4 is achieved. In addition, the insertion of the magnets 4 in the recesses 10 is facilitated.

It should be noted that within a plate pack 2 and slats 1 may be provided, which are configured according to the blade shown in FIG. 2, with the proviso that they have instead of the voids 13 resilient lugs 11, as in the in the Fig. 1 illustrated recesses 10A is the case. By an alternate arrangement of such a blade with the blade 1 shown in Fig. 2 thus can be both a positioning in a radial direction by means of a resilient projection 11 and in a tangential direction by means of a resilient projection 14 with respect to a in the recesses 10th achieve brought magnets 4.

The recess 10 has a certain width 18, which is defined by the resilient projection 14 in the initial state, that is, without a magnet 4. The joint, which is predetermined by a width 23 (FIG. 13) of the magnet 4 to the width 18 of the recess 10, can be dimensioned as a transitional or interference fit. If the interpretation is done as Press fit, then the width 18 of the recess 10 is preferably selected so that a minimum coverage of a few micrometers is achieved. As a result, a centering effect is achieved with all resilient lugs 14. Thus, each resilient lug 14 contributes to the plurality of louvers 1 for attachment of the magnets 4. In sum, therefore, results in a relatively large holding force on the magnets 4. If the interpretation as transition fit, then there is an easy mountability of the magnets 4 in the recesses 10, so that this embodiment is advantageous if even lower holding forces for attachment of Magnets 4 suffice.

The designed as a bracket resilient projection 14 has a height 19 and a width 20. About the choice of the height 19 and the width 20 of the resilient projection 14, the

Stiffness and thus the possible holding force of the resilient projection 14 can be specified within certain limits. Preferably, the stiffness of the resilient lug 14 is set so that the holding force in the tangential direction on the magnet 4 is just sufficient, the magnet 4 is brought to the bracket opposite side of the recess 10 on a bulbous protrusions 17 for concern.

Fig. 3 shows successively arranged lamellae 1 in an excerpted representation corresponding to the designated in Fig. 2 with III section. It may be advantageous that a plate pack 2 is designed so that the end plates have no resilient lugs 11, 14. Fig. 3 shows an end plate 1 'in front of a blade, which is designed according to FIG. The end plate 1 'has, on the one hand, a bulbous bulge 17' and, on the other hand, instead of a resilient extension 14, a further bulbous bulge 17 ''. Thus, the end plate 1 'in tangential Direction on both sides a fixed stop for a magnet 4, which is inserted in one of the recesses 10. As a result, a pre-centering of the magnet 4 is made possible. The distance between the two bulbous bulges 17 ', 17''from each other is chosen so large that there is a clearance fit, taking into account all tolerances. The end plate 1 'also prevents a resilient projection 14 is so strong bent during insertion of the magnet 4 in the recess that this protrudes beyond an end face 21 (Fig. 13) of the plate pack 2.

For the production of plate packs 2 with different lamellae 1, 1 ', in particular with a corresponding to FIG.

3 configured end plate 1 ', when punching slats 1 with resilient lugs 11, 14 and fins 1' without such resilient lugs 11, 14 in the order as they are needed during packaging, are produced and then joined together. This can be realized that for the generation of the resilient lugs 11, 14 in the punch slide or single punch are present, which are adjusted automatically, so that the desired structure of the plate set 2 results.

The play 22 between the magnet 4 and the bulbous bulge 17 '' when abutting on the corresponding bulbous bulge 17 'is preferably chosen so that a certain pre-centering when inserting the magnet

4 ensures, but still a simple installation is possible. By the game 22 of the clearance between the magnet 4 and recess 10, the position of the magnet 4 in the tangential direction would not be determined exactly. By means of the resilient attachment 14, the magnets 4 are always secured on one side, as defined by the bulbous bulge 17 ', of the recess 10 within a lamella packet 2 in the tangential direction already during the joining process be pressed in such a way that all magnets 4 depending on

Position of the resilient lugs 14 are left or right in the recess 10, wherein in Figs. 2 and 3, a situation is shown in which the magnets 4 are located in relation to the illustrated drawing right in the recess 10. This reduces the influence of a centering error in the tangential direction on the cogging torque.

Depending on the design of the resilient lugs 14, in particular by the height 19 and the width 20 of the resilient lugs 14 and an overlap of the resilient

Approach 14 and the magnet 4 is determined before mounting, the resilient lugs 14 can be used in addition to the tangential centering for fixing the magnets 4. For this purpose, the resilient projections 14 are made somewhat stiffer, for example, by a relatively large width 20, and a certain positive overlap between the resilient projection 14 in the untensioned state and the magnet 4th

4 shows a lamella 1 of a lamella packet 2 according to a third exemplary embodiment of the invention. In this embodiment, the recesses 10A, 10B of the lamella 1 are designed in two different ways, with the embodiments alternating in the tangential direction, that is to say over the circumference. The recesses 10A have resilient lugs 11 which allow positioning in a radial direction. In contrast, the recesses 10B have a void space 13 instead of the resilient lug 11 as provided at the recess 10A. The resilient projection 11 can achieve a positioning of the magnet 4 in addition to a positioning in the radial direction. For fixing the magnet 4 in the recesses 10A, 10B can thereby the resilient projections 11 and the resilient Approaches 14 interact. The packaging of a

Lamellae packs 2 with those shown in Fig. 4 slats 1 is preferably carried out so that the individual slats 1 of the plate pack 2 are twisted packetized to each other, so that, for example, behind a recess 10 A is a recess 10 B of the next slat. In this embodiment, it is also advantageous if the resilient lugs 14 cause a positioning in the tangential direction, while the resilient lugs 11 cause both a positioning of the magnets in the radial direction and an attachment of the magnets 4 in the recesses 10A, 10B.

Fig. 5 shows a blade 1 of a plate pack 2 according to a fourth embodiment of the invention. The lamella 1 has recesses 10, in which resilient lugs 14, 14 'are provided, which are designed in each case bow-shaped. By the resilient lugs 14, 14 'of the recess 10, a centering of the magnets 4 is achieved in a tangential position. The bow-shaped, resilient lugs 14, 14 'hold the magnets 4 in the pockets. In order for the magnets 4 to sit centrally in relation to the respective recess 10, the rigidity of the two resilient lugs 14, 14 'is at least substantially the same. A possibly required for this high accuracy in manufacturing can be done by suitable manufacturing processes, for example by punching or laser cutting.

Fig. 6 shows a blade 1 of a plate pack 2 according to a fifth embodiment of the invention. In this embodiment, the recesses 10A, 10B are configured in two different ways, wherein the recesses 10A have a resilient projection 14, which is configured bow-shaped, and wherein the recesses IOB in a region in which the recesses 10 A, the resilient lugs 14 are provided, a free space 25 is provided. However, in all the recesses 10A, 10B, bulged bulges 17 are provided which lie opposite the resilient extension 14 or the free space 25. The recesses 10A alternate with the recesses 10B in the tangential direction, that is, in the circumferential direction. The disk set can be composed of the slats 1, that behind a recess 10 A of a slat 1, the recess 10 B of another slat is arranged. When introducing the magnets 4 in the disk pack 2 thereby yielding of the resilient lugs 14 of the recesses 10A is facilitated. Specifically, the resilient lugs 14 may partially bend axially parallel and thus exert relatively large holding forces on the inserted magnets 4.

Fig. 7 shows a blade 1 of a plate pack 2 according to a sixth embodiment of the invention. In this embodiment, each recess 10 on opposite resilient lugs 14, 14 ', which serve to center the magnets 4 in the tangential direction. Furthermore, each recess 10 on a resilient projection 11 which is formed like a nosed. The resilient lugs 11 are used both for radial positioning of the magnets 4 and for clamping the magnets 4 in the respective recess 10th

Fig. 8 shows a blade 1 of a plate pack 2 according to a seventh embodiment of the invention. In this embodiment, sinus poles 27 are provided in the region of the recesses 10 on a circumference 26 of the lamella 1. The sine poles 27 have a favorable effect on the course of the field lines in the lamella 1. It is desirable that the magnetic flux within the Rotor 3 passes from a magnet 4 over the stator and not directly to an adjacent magnet. In addition, a magnetic short circuit should be avoided. The stray magnetic flux and also the magnetic short circuit reduce the efficiency of the electrical machine, so that the losses due to the stray magnetic flux and the magnetic short circuit should be kept small. This is achieved by the sine poles 27.

Fig. 9 shows a blade 1 of a plate pack 2 according to an eighth embodiment of the invention. In this embodiment, the lamella 1 bores 28, 28 ', wherein between two holes 28, 28' each have a recess 10 A of the lamella 1 is provided. To simplify the illustration, only the bores 28, 28 'are marked in FIG. 9. The holes 28, 28 'are thus distributed over the circumference 26 of the lamella 1. Depending on the size of the bore 28 results between the recess 10A and the bore 28 a resilient projection 14 with a certain width 20. The same applies in the illustrated Embodiment with respect to the bore 28 'and the recess 10A, so that on the recess 10A on both sides resilient lugs 14, 14' are configured. In this way, an alternative embodiment of the resilient lugs 14, 14 'results. Furthermore, the holes 28, 28 'in terms of the magnetic scattering behavior and a magnetic short circuit effect in the desired manner advantageously.

Furthermore, the recesses 10 B have resilient lugs 11, while the recesses 10 A no resilient lugs 11 and also no voids 13, as shown for example in FIG. 4, have. In a possible, mutually twisted arrangement of the slats 1 within the plate pack 2 thus results in a relatively large Clamping force of the resilient lugs 11.

Fig. 10 shows a blade 1 of a disk pack 2 according to a ninth embodiment of the invention. In this embodiment, notches 29 are provided on the periphery 26 of the lamella 1, which have the advantage that they reduce the leakage magnetic flux and the magnetic short circuit.

Fig. 11 shows a final or intermediate blade 1 '' of a disk pack 2, which depends on the respective

Use case in a disk pack 2 one or more times can be provided. The lamella 1 '' has free spaces 25, 25 'which are provided on each of the recesses 10. Furthermore, the recesses 10 have voids 13. The lamella 1 "may, for example, be provided one or more times on the end face 21 of the lamella packet 2 in order to facilitate the introduction of the magnets 4 into the lamella packet 2. Furthermore, it can thereby prevent the protrusion of a bent in an axial direction resilient projection 11, 14, 14 'on the end face 21. In addition, the lamella 1 '' is also suitable as an intermediate plate 1 '', which is provided within the plate pack 2, to allow elastic, axial deformation of a resilient projection 11, 14, 14 '.

FIG. 12 shows a section through a disk pack 2, as shown in FIG. 13, along the section line indicated by XII in FIG. 7 in a simplified, partial representation. The disk set 2 has on the end face 21 two according to the end plate 1 '' shown in Fig. 11 configured lamella IA, IB. Correspondingly, two louvers IC, ID designed in accordance with the end lamella 1 "shown in FIG. 11 are also provided on one of the end faces 21 opposite the end face 21 ' intended. Furthermore, lamellae IE, IF are provided which have both a resilient attachment HE, HF and also a bow-shaped resilient attachment 14E, 14F. In addition, intermediate plates IG, IH are provided, which are configured according to the plate 1 'shown in Fig. 11. Thus, seen in the axial direction 30 behind the slat IE the intermediate plate IG is provided so that a deflection of the resilient projection 11 in the axial direction 30 and a deflection of the resilient projection 14E in the axial direction 30 is possible. The same applies to the lamella IF, behind which the intermediate lamella IH is provided. The structure of the disk pack 2 described with reference to the lamellae IE, IG, IF, IH continues up to the end face 21, wherein immediately adjacent to the end face 21 two lamellae IA, IB are provided in succession, corresponding to that shown in FIG Slat 1 '' are configured.

It should be noted that several design variants have been described with reference to FIGS. 1 to 12, wherein a disk pack 2 may be constructed in a suitable manner from a plurality of different disks 1, 1 ', 1' '. Such a variant embodiment is shown briefly with reference to FIG. 12. In addition, the design of the slats 1, 1 ', 1' 'can also be done by combining a plurality of individual elements. For example, the resilient lugs 11, 14, 14 'in other ways on the individual recesses 10 are distributed.

FIG. 13 shows a rotor 3 with a disk pack 2 into which magnets 4 are inserted. The magnets 4 inserted into the rotor 3 have a width 23.

The invention is not limited to the described embodiments.

Claims

claims

1. Electrical machine, in particular electric motor, with a rotor (3), wherein the rotor (3) at least one disc pack (2) having a plurality of fins (1), and at least one magnet (4), at least partially in one in the disc pack (2) provided recess (10) is arranged, characterized in that at least one lamella (1) at least one resilient projection (11, 14) is formed, for at least indirect attachment of the magnet (4) in the recess serves.

2. Electrical machine according to claim 1, characterized in that the resilient projection (14) for at least indirect attachment of the magnet (4) in the recess (10) is biased at least substantially in a tangential direction.

3. Electrical machine according to claim 1, characterized in that the resilient projection (11) is biased for at least indirect attachment of the magnet in the recess at least substantially in a radial direction.

4. Electrical machine according to one of claims 1 to 3, characterized in that at a plurality of fins (1) of the plate pack (2) resilient lugs (11, 14) are formed.

5. Electrical machine according to claim 4, characterized in that at least a part of the resilient lugs (11, 14) of the lamellae in an axial direction (30) is arranged at least substantially one behind the other.

6. Electrical machine according to claim 5, characterized in that between at least two successively arranged resilient lugs (11, 14), a gap is provided.

7. Electrical machine according to one of claims 4 to 6, characterized in that at least one on an end face (21) of the

Lamella packages (2) arranged blade (IA) has no resilient approach.

8. Electrical machine according to one of claims 1 to 7, characterized in that at least one resilient projection (14) is designed bow-shaped.

9. Electrical machine according to one of claims 1 to 8, characterized in that at least one resilient projection (11) is designed nose-shaped.

10. Electrical machine according to one of claims 1 to 9, characterized in that the magnet (4) is connected at least by means of an adhesive with the resilient projection (11, 14).