DE102009047485A1 - Electric machine - Google Patents

Abstract

An electric machine (1), which serves in particular as an electric motor for motor vehicles, comprises a rotor (2) and a shaft (3). The rotor (2) in this case has at least one lamella (4), which is joined to the shaft (3) and connected to the shaft (3). For this purpose, the lamella (4) in a mounting region (15) has a central receiving bore (5) through which the shaft (3) extends. The lamella (4) has relief recesses (22-27) in the attachment area (15), which allow deformation of the lamella (4) in the attachment area (15). As a result, an advantageous joining of the blade (4) on the shaft (3) is possible.

Description

State of the art

The invention relates to an electrical machine, in particular an electric motor, with a rotor and a shaft. 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 to assist an adjustment of elements of a motor vehicle.

From the DE 195 23 789 A1 is an electric motor with a rotor, a stator and other components, which are housed in a housing of the electric motor known. On the stator, a plurality of stator windings are arranged on a stator core. The stator core is fixedly mounted on the outer circumference of a support sleeve and consists of magnetic or magnetizable material. In addition, 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 stator is controlled by means of a control circuit such that a rotating magnetic field results inside the motor. This will then take the rotor with you.

The from the DE 195 23 789 A1 known electric motor has the disadvantage that the attachment of the slats and / or the disk packs on the shaft is expensive.

It is conceivable that the attachment of the slats and / or the disk packs is carried out on the shaft by a press fit. So that the forces are not so great when pressing the individual slats or the disk packs on the shaft, the joining partners must be closely tolerated. However, this means high production costs. In addition, arise in compounds in which the attachment is produced by a press fit, due to the high coverage when joining the shaft and the packages grooves and eaters. This can result in errors in the coaxiality and a reduction in the holding force. In addition, there may be plastic deformation on the outer diameter of the slats.

Disclosure of the invention

The electric machine according to the invention with the features of claim 1 has the advantage that a joining process optimized and thus an optimized connection of the shaft with the slats is possible.

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

The rotor preferably has a plurality of fins. These slats can be added individually, as a plate pack or by means of several disc packs on the shaft. In this case, a mechanical connection is formed between the shaft and at least one lamella per lamella packet. In the assembled state, therefore, there is preferably a mechanical connection between a plurality of fins and the shaft. Depending on the configuration, in each case a mechanical connection can also be configured between all slats and the shaft. However, one part of the lamellae can be used for centering and another part of the lamellae can be used for mechanical connection to the shaft.

It is advantageous that the lamella in the attachment region has at least one clamping projection adjoining the receiving bore, which cooperates with the shaft for connecting the lamella to the shaft, and in that the relief recess is associated with the clamping projection. Furthermore, it is advantageous in this case that the relief recess enables elastic and / or plastic deformation of the lamella, at least in the area of the clamping projection. When joining the blade to the shaft thus a certain yielding of the clamping projection is made possible by elastic and / or plastic deformation of the blade between the clamping projection and the relief recess. As a result, the occurrence of mechanical stress peaks during pressing can be avoided. This minimizes seizure and scoring on the shaft during insertion. About the design of the relief recess and the arrangement of the relief recess in the attachment area, the insertion force occurring can be specified within certain limits. Here, the press-in force can be adjusted depending on the design of the receiving bore and in particular an inner diameter of the receiving bore of the blade. In addition, a certain tolerance fluctuation of the individual slats can be tolerated, since the internal geometry of the slat in the attachment area during the fitting by deformation of the mounting portion, in particular on the clamping projection, adapts.

It is also advantageous that a plurality of clamping projections are provided which cooperate with the shaft, that the clamping projections are arranged distributed in a circumferential direction of the receiving bore and that each clamping projection is associated with at least one relief recess. As a result, an advantageous addition of the Allows slat on the shaft, in which a largely centered arrangement of the slat is possible despite tolerances. By the relief recesses, the rigidity of the blade is reduced, so that an excess force occurring during joining can be derived as a plastic deformation of the relief recesses. In this case, a plastic deformation on the outer diameter of the shaft is minimized.

It is advantageous that the lamella in the attachment region has at least one edge adjacent to the receiving bore, which cooperates with the shaft, and that the relief recess is associated with the edge. In this case, it is also advantageous that the edge is configured as an edge extending at least approximately rectilinearly. In this embodiment, the lamella bears with the edge on the shaft of the rotor. In this case, a certain deformation of the blade is made possible on the edge, wherein the plastic deformation is derived on the relief recess. As a result, an advantageous adaptation of the geometry of the blade in the region of the receiving bore is possible. Due to the design of the relief recess and the internal geometry of the receiving bore, in particular the edge, a press-fit force range can thus be determined in an advantageous manner.

It is also advantageous that in the attachment region between the edge and the relief recess, an elastically and / or plastically deformable fastening web of the lamella is configured. Due to the design of the relief recess and the receiving bore, a more or less wide attachment web of the blade can be configured to at least approximately specify the desired maximum press-in force.

It is advantageous that an extension of the relief recess in a circumferential direction is greater than an extension of the relief recess in a radial direction. As a result, the rigidity of the lamella can be reduced, especially in the radial direction and especially in the area of the relief recess. This is particularly advantageous in combination with a deformable fastening web provided on an edge of the receiving bore. In this case, the relief recess can be configured in particular as an elliptical relief recess. When joining the lamella on the shaft, this can lead to a certain deformation of the elliptical relief recess.

It is also advantageous that the relief recess is at least approximately designed as a circular relief recess. This is particularly advantageous in combination with a clamping projection, wherein the circular relief recess is preferably arranged radially behind the clamping projection.

It is also advantageous that a plurality of relief recesses are provided, which are arranged at least approximately on a aligned on the central receiving bore circular line. In this case, it is also advantageous that the relief recesses are distributed uniformly over the circumference in a circumferential direction. As a result, an optimized joining and a reliable centered arrangement of the lamella on the shaft is made possible. In addition, an advantageous compensation in terms of tolerance variations of the individual slats is possible.

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. It shows:

1 an electrical machine with a rotor in a partial, schematic representation according to a first embodiment of the invention and

2 a lamella of in 1 illustrated rotor of the electric machine according to a second embodiment of the invention.

Embodiments of the invention

1 shows an electric machine 1 with a rotor 2 and a wave 3 in an excerpt, schematic representation according to a first embodiment. The electric machine 1 can be configured in particular as an electric motor and serve for a motor vehicle. Especially suitable is the electric machine 1 in this case for the power-operated adjustment of elements of a motor vehicle, for example a sunroof, a window or a seat element. Furthermore, the electric machine 1 serve as an electric motor for power steering or other support measures in motor vehicles. The electric machine according to the invention 1 However, it is also suitable for other applications.

In the 1 is a lamella 4 of the rotor 2 shown. Here, the rotor points 2 a variety of such slats 4 on. The rotor 2 is stuck with the wave 3 connected. For this purpose, the lamella 4 and the other fins on the shaft 3 together. At least a part of the slats, in particular the slat 4 , is here with the wave 3 positively connected. A part of the slats can also serve only for centering. The lamellae can individually on the lamella 3 or as a disk pack or by means of several disk packs pre-mounted on the shaft 3 be joined. The design of the slats, with the shaft 3 are positively connected, is exemplified by the lamella 4 described.

The slat 4 has a central receiving bore 5 on. The receiving bore 5 This is slightly larger than a cross section of the shaft 3 designed. The wave 3 has an axis 6 on that in the 1 oriented perpendicular to the plane of the drawing. The receiving bore 5 is in the middle of the lamella 4 provided so that the mounted lamella 4 with respect to the axis 6 is centered.

The slat 4 has magnetic pockets 7 . 8th on. Here are the individual magnetic pockets of the multiple fins 4 arranged one behind the other, so that in the mounted state magnets in the magnetic pockets 7 . 8th can be introduced. Here are exemplary two magnetic pockets 7 . 8th shown. However, it is also conceivable another number of magnetic bags. It is also an embodiment of a rotor 2 conceivable without magnets, for example with a standard DC rotor or standard DC armature.

Furthermore, the lamella points 4 Add holes 9 . 10 . 11 . 12 on. The joining bores 9 to 12 For example, to package the individual blades of the rotor 2 serve. Furthermore, the individual slats including the slat 4 about the joining holes 9 to 12 aligned with each other. In addition, further holes in the lamella 4 be provided, which serve to optimize the magnetic flux and thus to reduce a magnetic leakage flux. Correspondingly, it is also possible to provide recesses which serve to optimize the magnetic flux.

The slat 4 has a mounting area 15 on, which together with further attachment areas of the further fins a hub of the rotor 2 forms. At the attachment area 14 is the slat 4 on the shaft 3 attached. Here are in the attachment area 15 clamping projections 16 . 17 . 18 . 19 . 20 . 21 intended. The clamping projections 16 to 21 are here in the radial direction on the axis 6 designed designed. The clamping projections 16 to 21 extend in the radial direction into the cross section of the shaft 3 as long as the slat 4 not yet on the wave 3 is mounted. When joining the slat 4 on the wave 3 become the clamping projections 16 to 21 therefore acted upon in the radial direction to the outside.

In the attachment area 15 shows the wave 4 also relief recesses 22 to 27 on. Here, each of the clamping projections 16 to 21 one of the relief recesses 22 to 27 assigned. The respective relief recess 22 to 27 is here in the radial direction behind the respective clamping projection 16 to 21 , For example, the clamping projection 16 the relief recess 22 assigned. In the radial direction is therefore behind the clamping projection 16 the relief recess 22 ,

In this embodiment, the relief recesses 22 to 27 as circular relief recesses 22 to 27 designed in the form of through holes. In contrast to recesses that reduce the leakage flux, the relief recesses are used 22 to 27 for deliberately reducing the rigidity of the lamella 4 and thus to allow some deformation of the blade 4 in the attachment area 15 ,

When joining the slat 4 on the wave 3 become the clamping projections 16 to 21 at least substantially radially outwardly loaded with a force or mechanical stress. Through the relief recesses 22 to 27 Here is an elastic and / or plastic deformation of the blade 4 in the attachment area 15 allows, so that the clamping projections 16 to 21 give in the radial direction something. This yielding leads to a deformation of the lamella 4 in the attachment area 15 , This leads to a deformation of the relief recesses 22 to 27 , In particular, mechanical stress peaks occurring during joining can thus be limited. The excess press-in force or mechanical press-in stress is in this case in a plastic deformation of the blade 4 in the area of relief recesses 22 to 27 transformed. Due to the design of the relief recesses 22 to 27 In this case, at least approximately a desired range for the occurring pressing force can be specified. Thus, a scatter of the incoming press-in force or mechanical stress during joining is reduced.

Thus, an optimized joining of the lamella 4 on the wave 3 possible. Here, eaters and grooves, which can occur during the joining process, can be reduced or at least largely prevented. In addition, an advantageous centering of the blade 4 with respect to the axis 6 be achieved.

In this embodiment, the clamping projections 16 to 21 and the associated relief recesses 22 to 27 in a circumferential direction 30 evenly around the axis 6 arranged. In addition, the lie relief recesses 22 to 27 on a circle line 31 so that these are at least approximately the same distance to the axis 6 exhibit. As a result, the relief recesses 22 to 27 evenly over the circle 31 in the circumferential direction 30 distributed. For example, in this embodiment, six relief recesses 22 to 27 provided so that these pairs spaced by 60 ° to each other on the circular line 31 are arranged.

When joining the slat 4 on the wave 3 This prevents eaters and scores and a centered arrangement of the on the shaft 3 attached lamella 4 reached.

2 shows a lamella 4 of in 1 shown rotor 2 the electric machine 1 according to a second embodiment. In this embodiment, the lamella 4 in the attachment area 15 to the receiving bore 5 adjacent edges 36 . 37 . 38 . 39 . 40 . 41 on. In the initial state of the lamella 4 are the edges 36 to 41 as rectilinear edges 36 to 41 designed. The edges 36 to 41 extend in the initial state in sections in the cross section of the shaft 3 , When joining the slat 4 on the wave 3 becomes the attachment area 15 the slat 4 at the edges 36 to 41 acted upon in the radial direction. This joining forces or mechanical stresses occur in the blade 4 , especially in the attachment area 15 , on.

The edges 36 to 41 is each one of the relief recesses 22 to 27 assigned. Here are the relief recesses 22 to 27 radially behind the edges 36 to 41 but in the circumferential direction 30 each about midway behind the respective edge 36 to 41 arranged.

The relief recesses 22 to 27 are even across the circle 31 arranged distributed. Furthermore, an extension 42 the relief recess 23 in the circumferential direction 30 larger than an extension 43 the relief recess 23 in the radial direction. The same applies to the other relief recesses 22 to 27 ,

This has the relief recesses 22 to 27 an at least approximately elliptical configuration.

Between the edge 38 and the relief recess 24 is a fastening bridge 44 educated. The fastening bridge 44 is elastic and / or plastically deformable. When joining the slat 4 on the wave 3 the fixing bar deforms 44 of the attachment area 15 in the radial direction. This leads to a deformation of the relief recess 24 , Accordingly, further fastening webs between the edges 36 . 37 . 39 . 40 . 41 and the associated relief recesses 22 . 23 . 25 . 26 . 27 designed.

Thus, advantageously, the fluctuation of Einpresskräften when joining the blade 4 on the wave 3 be reduced. Furthermore, waves can also 3 are used, which are designed relatively hard and can not or only slightly deform when joining. Due to the design of the relief recesses 22 to 27 In this case, the occurring pressing force can be adjusted to a desired range. In this case, other geometries of the receiving bore 5 advantageously by relief recesses 22 to 27 be supplemented.

The invention is not limited to the described embodiments.

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 19523789 A1 [0002, 0003]

Claims (12)

Electric machine ( 1 ), in particular electric motor, with a rotor ( 2 ) and a wave ( 3 ), wherein the rotor ( 2 ) at least one lamella ( 4 ), which on the shaft ( 3 ) and with the wave ( 3 ), and wherein the lamella ( 4 ) in a mounting area ( 15 ) a central receiving bore ( 5 ), through which the shaft ( 3 ), characterized in that the lamella ( 4 ) in the attachment area ( 15 ) at least one relief recess ( 22 - 27 ) having. Electrical machine according to claim 1, characterized in that the lamella ( 4 ) in the attachment area ( 15 ) at least one of the receiving bore ( 5 ) adjacent clamping projection ( 16 - 21 ), which is used to connect the blade ( 4 ) with the wave ( 3 ) and that the relief recess ( 22 - 27 ) the clamping projection ( 16 - 21 ) assigned. Electrical machine according to claim 2, characterized in that the relief recess ( 22 to 27 ) at least in the region of the clamping projection ( 16 - 21 ) an elastic and / or plastic deformation of the blade ( 4 ). Electrical machine according to claim 2 or 3, characterized in that a plurality of clamping projections ( 16 - 21 ) provided with the shaft ( 3 ) cooperate, that the clamping projections ( 16 - 21 ) in a circumferential direction ( 30 ) at the receiving bore ( 5 ) are distributed and that each clamping projection ( 16 - 21 ) at least one relief recess ( 22 - 27 ) assigned. Electrical machine according to claim 1, characterized in that the lamella ( 4 ) in the attachment area ( 15 ) at least one of the receiving bore ( 5 ) adjacent edge ( 36 - 41 ) connected to the shaft ( 3 ) and that the relief recess ( 22 - 27 ) of the edge ( 36 - 41 ) assigned. Electrical machine according to claim 5, characterized in that the edge ( 36 - 41 ) as at least approximately rectilinear edge ( 36 - 41 ) is configured. Electrical machine according to claim 6, characterized in that in the fastening area ( 15 ) between the edge ( 36 - 41 ) and the relief recess ( 22 - 27 ) an elastically and / or plastically deformable fastening web ( 44 ) of the lamella ( 4 ) is configured. Electrical machine according to one of claims 1 to 7, characterized in that an extension ( 42 ) the relief recess ( 22 - 27 ) in a circumferential direction ( 30 ) is greater than an extension ( 43 ) the relief recess ( 22 - 27 ) in a radial direction. Electrical machine according to claim 8, characterized in that the relief recess ( 22 - 27 ) at least approximately as an elliptical relief recess ( 22 - 27 ) is configured. Electrical machine according to one of claims 1 to 6, characterized in that the relief recess ( 22 - 27 ) at least approximately as a circular relief recess ( 22 - 27 ) is configured. Electrical machine according to one of claims 1 to 10, characterized in that a plurality of relief recesses ( 22 - 27 ) are provided, which at least approximately on one of the central receiving bore ( 5 ) aligned circular line ( 31 ) are arranged. Electrical machine according to claim 11, characterized in that the relief recesses ( 22 - 27 ) in a circumferential direction ( 30 ) evenly over the circle ( 31 ) are arranged distributed.

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