AT525718A1 - rotor - Google Patents

Abstract

The invention relates to a rotor (3) with a shaft (4) and with at least one lamella (5) which is arranged on the shaft (4), the lamella (5) having an opening (7) through which the shaft (4) is passed through, and wherein the lamella (5) has a first connecting element (8) which cooperates with a second connecting element (9) formed on the shaft (4), and wherein in the radial direction (12) above the first Connecting element (8) in the lamella (5) an opening (10) is formed, so that the first connecting element (8) is resiliently deformable.

Description

binding element interacts.

The invention also relates to a lamella made of sheet metal for the rotor of an electrical machine, the lamella having a lamella body with an opening through which a shaft of the electrical machine can be passed, and the lamella body having a first connecting element which is connected to a shaft formed second connecting element

interacts.

The invention further relates to an electrical machine comprising a stator

and a rotor.

To connect the laminations to the rotor shaft of an electric motor, it is known to use deformable shaped elements. For example, describes the

DE 10 2007 032 138 A1 discloses a method for fastening a laminated or laminated rotor core to a rotor shaft or a rotor carrier of a rotor of an electrical machine and a rotor for an electrical machine, the laminated core or rotor laminated core being non-positively connected to the rotor shaft or the rotor carrier/ is. It is envisaged that the lamination or rotor laminated core is provided with protruding projections on an inner or on an outer peripheral surface and then with plastic deformation of the protrusions.

cracks pressed onto the rotor shaft or the rotor carrier or into an opening

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connect it to the rotor shaft or the rotor arm.

EP 3 172 815 B1 describes a rotor for an electric motor with a shaft and with a plurality of laminations which are accommodated on the shaft and the laminations have an inner passage through which the shaft is guided, so that the laminations have the inner passage on the shaft are centered. The lamellae have spring tongues formed in the inner passage, which have a bracing force in the circumferential direction with at least one of the

Wave-trained counter-geometry are braced.

The present invention is based on the object of providing a possibility for compensating for the influence of the centrifugal force on the connection of the laminations to the rotor shaft of a rotor for an electrical machine mentioned at the outset

to accomplish.

The object of the invention is achieved with the rotor mentioned at the outset in that an opening is formed in the radial direction above the first connecting element in the lamella, so that the first connecting element fe-

which is elastically deformable.

In addition, the object of the invention is achieved with the slat mentioned at the outset, in which an opening is formed in the radial direction above the first connecting element in the slat body, so that the first connecting element

ment is resiliently deformable.

The object of the invention is further achieved with the electric motor mentioned at the outset

solved in that it has the rotor according to the invention.

The advantage here is that with this design of the rotor, a combination of force-locking and positive-locking connection can be achieved, with the remaining section of the lamella resting on the shaft being due to the opening

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can become.

According to one embodiment of the invention, it can be provided that the opening in the lamella is at least approximately crescent-shaped. With this embodiment variant, the resilient effect of the first connecting element can be further improved, in particular if, according to a further embodiment variant of the invention, the first connecting element is designed in an arc shape. The latter variant can also expand the

It is better to avoid slats under the influence of centrifugal force.

According to another embodiment variant of the invention, the first connecting element can have two contact points or contact areas with the shaft which are spaced apart from one another in the circumferential direction. This design of the non-positive portion of the connection between the blade and the shaft can

Centering effect can be achieved for the lamella.

If the non-positive component cannot be limited to contact points, but is designed as a contact area, it can be provided according to a further embodiment variant of the invention that the contact areas each extend over a length that is between 0.1% and 10% of the total length of the first connecting element . By adhering to this length range for the contact areas, a reduction in the spring-elastic behavior of the

first connecting element are better avoided. Through this targeted

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carry.

The centering effect mentioned is supported if, according to one embodiment variant, normals through the contact points or contact areas have a course deviating from the radial direction and intersect outside the center point of the shaft—viewed in the axial direction—at a cutting angle. A speed-independent connection between the disk and the shaft for torque transmission and centering of the disk can thus be achieved, since the connecting force is not exactly, but only approximately, in the radial direction.

direction and is also directed in the circumferential direction.

This effect can be enhanced if according to a variant of the

Invention of the intersection angle of the normal is between 5 ° and 90 °.

In order to improve the spring-elastic behavior of the first connecting element, according to another embodiment variant it can be provided that the first connecting element has a radial width of at most 40% of the radial

Having width of the lamella.

The connection of the lamella to the shaft can be further improved and the lifting of the lamella from the shaft can be further reduced if, according to a further embodiment of the invention, between the first connecting element and

the second connecting element outside of the contact points or the contact areas, a radial distance is formed, the radial distance between

Is 0.1% and 5% of a radial height of the second connecting element.

For easier assembly of the lamella on the shaft, according to an embodiment variant of the invention, the second connecting element can be hump-shaped, semi-cylindrical, semi-liptical, parabolic, linear, viewed in cross-section.

sen-shaped, ramp-shaped, trapezoidal, triangular, polygonal.

According to a further embodiment of the invention, it can be provided

that the first connecting element has a thickness in the axial direction of between 50%

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if to improve the mountability of the lamella on the shaft.

Although it is possible to form only one connection area between the disk and the shaft, it is advantageous for avoiding the widening of the disk if, according to one embodiment of the invention, several first connecting elements are distributed over the circumference of the disk and distributed over the circumference of the shaft.

divides several second connecting elements are arranged.

For a better understanding of the invention, this is based on the following

Figures explained in more detail.

They each show in a greatly simplified, schematic representation:

1 shows an electrical machine in longitudinal section;

2 shows a section of a rotor in an end view;

FIG. 3 shows an enlarged detail of the section according to FIG. 2;

Fig. 4 shows an embodiment variant of a second connecting element in

end view;

5 shows a further embodiment variant of a second connecting element

in front view;

6 shows a further variant embodiment of a second connecting element

in front view.

As an introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numbers or the same component designations, it being possible for the disclosures contained throughout the description to be applied to the same parts with the same reference numbers or the same component designations. Also are in the

Description selected location information, such as top, bottom, side, etc. on the

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information to be transferred to the new position in the event of a change in position.

1 shows a simplified representation of an electrical machine 1 in the form of an electric motor. The electric machine 1 comprises a stator 2 and a rotor 3. The rotor 3 is arranged radially inside the stator 2, ie surrounded by the stator 2. Furthermore, the rotor 3 has a shaft 4 on which it is attached in a torque-proof manner.

assigns or with which it is rotatably connected.

It should be pointed out that the electrical machine 1 according to FIG. 1 is only to be understood as an example. The electrical machine 1 can also be designed differently, for example as an axial flow machine. In this case, the stator 2 is arranged in the axial direction next to the rotor 3 and not surrounding it. In addition, the electrical machine 1 can also have more than one stator 2 and/or more than one rotor 3 . Furthermore, the electrical machine 1 does not necessarily have to be an electric motor, but can also be designed as a generator, for example.

be that

The electrical machine 1 is also shown in a simplified manner in that the windings or coils are not shown after this

Structure from the relevant prior art is known to. For further details of such electrical machines 1 is therefore on these relevant

referred to the state of the art.

The rotor 3 has at least one lamella 5 . However, the rotor 3 preferably has a plurality of lamellae 5, which are combined to form a lamella stack (which can also be referred to as a laminated core). It is further preferred that all lamellae 5 of the rotor 3 are designed such that the following explanations, which are directed at one lamella 5, also apply to all other lamellae 5.

are wearable.

The lamella 5 has a lamella body 6 (see FIG. 2) made of sheet metal, in particular a so-called electrical steel sheet, or consists of it. derar

Term electrical sheets are known per se, so that further discussions on this

71725 N2021/31300-AT-00

Silicon.

To enable the lamella 5 to be arranged on the shaft 4, the lamella body 6 has an opening 7 which is formed centrally and through which the shaft 4 extends. In other words, the lamella 5 is at least

almost circular in shape.

As already stated, the lamella 5 is arranged on the shaft 4 in a rotationally fixed manner, so that the lamella 5 is also rotated with the rotation of the shaft 4 . For this purpose, on the one hand, the lamella 5 has a first connecting element 8 and the shaft 4 has a second connecting element 8 which interacts with this first connecting element 8, as can be seen from FIGS. The first connecting element 8 of the blade 5 is preferably in one piece with the rest

Lamellar body 6 formed.

The first connecting element 8 of the lamella 5 is designed as a spring-elastic shaped element. To provide the spring elasticity, in the radial direction above the first connecting element 8 in the lamella 5, i.e. in the lamella

body 6, an opening 10 is formed.

The opening 10 is surrounded or delimited entirely by the material of the lamella 5, i.e. entirely by the lamella body 6, as can be seen from FIG. In other words, the breakthrough 10 is not in the form of an

fenen groove formed.

The opening 10 has the effect that the first connecting element 9 can deviate into this opening 10 when the lamella 5 is mounted on the shaft 4 . In the process, the first connecting element 9 is also pretensioned (in the circumferential direction 11 of the lamella 5). It should be mentioned that the assembly of the blade 5 without de-

ren heating can occur.

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assign or train.

As can be seen from FIG. 2, the opening 10 is preferably at least approximately crescent-shaped or boomerang-shaped (in view of the axial end face of the lamella 5). This means that the opening 10 has two sections 13, 14 which are arranged at an angle 15 to one another. Angle 15 is measured between the center lines through sections 13, 14 as seen in FIG. The angle 15 between sections 13, 14

can be between 30° and 170°, for example every 45° to the center line.

The two sections 13, 14 are preferably of the same design, in particular

their also the same length.

Furthermore, one end area or both end areas can be rounded. It is also possible for a width 16 of the sections 13, 14 to remain the same over their entire length—possibly with the exception of the end regions.

appropriate.

However, the opening 10 can also have a different shape. For example, the opening 10 can run in a straight line, ie the angle 15 between the sections 13, 14 can be 180°. Next, the breakthrough 10 for intervention

be formed by auxiliary tools for mounting the blade 5.

Furthermore, the opening 10 can extend exactly in the circumferential direction in a different way than shown, so that the opening 10 has the same distance from the center of the lamella 5 at every point - possibly with the exception of the given

rounded end areas.

Next, the width 16 can change over the length of the opening 10 or the two sections 13, 14, so that the opening 10 is wider or

becomes narrower. For example, a central area of the opening 10 can be wider

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section of the lamella 5 is stress-optimized.

It is further preferred if all corner areas of the opening 10 are provided with curves or are rounded, so that the opening

fracture 10 does not have any sharp corners that could possibly have a notch effect.

Although the form of the opening 10 shown in FIG. 2 is the preferred one, the opening 10 can also be configured differently as long as it enables the spring-elastic functionality of the first connecting element 8 . For example, it can be round, oval, polygonal, etc., viewed from the front,

be leading

The opening 10 can be cut or punched out of the lamella body 6 by means of a cutting tool, in particular at the same time as the production of the lamella body 6 itself, so that the opening 10 can be produced with the tool for the production of the lamella body 6 from a sheet metal blank.

can be provided.

According to one embodiment variant of the slat 5, the first connecting element 8 is designed in the form of a strip or an arc. This first connecting element 8 also preferably does not follow exactly the circumferential direction 11 with its course, but has a central region 17 at a greater radial distance from the center of the lamella 5 than immediately adjoining sections 18, 19 of the first connecting element 8. This creates between the first Connecting element 8 of the lamella 5 and the second connecting element 9

the shaft 4 has a free space 20, as can also be better seen in FIG.

The two sections 19, 20 of the first connecting element 8 are preferably of the same design, in particular also of the same length, so that the first connecting element 8 is preferably of symmetrical design. Also the breakthrough 10

is preferably formed symmetrically.

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In principle, the first connecting element 8 can also have a different shape, as long as its functionality ensures elastic deformability

is.

The first connecting element 8 is arranged in the radial direction, in particular immediately adjacent to the second connecting element 9, i.e. it is part of the inner circumference of the at least approximately annular lamella 5. This at least approximately refers to the middle section forming the free space 20, which is caused by the deviation from the circular shape of the inner circumference of the

Lamella 5 is created.

The two sections 18, 19 of the first connecting element 8 are preferably of the same length. The length is measured at half the radial height of the connecting element 8 . In particular, the first connecting element 8 can

be metric.

According to the preferred embodiment variant of the lamella 5, it can be provided that the first connecting element 8 has two contact points or contact areas spaced apart from one another in the circumferential direction 11 with the shaft 4, i.e. the second connecting element 9. The second connecting element 9 is part of the shaft 4, in particular designed in one piece with it. In addition, the first connector 8 cannot connect the second connector 9

be designed or arranged touching.

This embodiment variant can be better seen in FIG. In this Fig. 3, the connection of the lamella 5 to the shaft 4 is exaggerated, i.e. an illustrated spacing of the lamella 5 from the shaft 4 next to the connection area formed by the connecting elements 8, 9 is in the real embodiment

not given, but the lamella 5 is in these areas on the shaft 4.

The first connecting element 8 preferably rests against the second connecting element 9 at only two points, the contact points. Depending on the manufacturing process, however, a connection area can also be formed. In this case, the two

the contact areas over a length of 21, which is between 0.1% and 10

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% of the total length of the first connecting element is 8. The total length is the distance that the first connecting element 8 occupies below the opening 10, with the beginning and end being determined by the outermost points of the opening 10, which are determined by radial rays 22 running through the center of the lamella 5 become, as can be seen from Fig.

2 can be seen.

According to a further preferred embodiment variant of the lamella 5 or of the rotor 3, it can be provided that normals 23 have a course that deviates from the radial direction due to the contact points or contact areas and are located outside the center 24 of the shaft 4, and thus also of the lamella 5 - Viewed in the axial direction and related to the plane (or the axis of rotation of the shaft 5) - cut with a cutting angle 25. Should contact areas be formed, the normals 23 are guided through the middle of the contact areas, so that the two partial areas that are created as a result are of the same size or the same

are long.

The cutting angle 25 can have a value between 0.1° and 120°. In the preferred embodiment variant, the intersection angle 25 of the normal 24

but has a value between 5° and 90°, in particular between 10° and 45°.

According to a further embodiment variant of the lamella 5 or the rotor 3, it can be provided that the first connecting element 8 has a radial width 26 of at most 40%, in particular between 5% and 35% or between 10% and 20%, of the radial width 27 the lamella 5 has. The term “maximum” takes into account that the first connecting element 8 has a course that deviates from the exact circumferential direction 11, and thus the radial width

26 varies over the course in the circumferential direction.

According to a further embodiment variant of the lamella 5 or the rotor 3, it can be provided that between the first connecting element 8 and the second connecting element 9 outside the contact points or the contact areas

rich a radial distance 28 is formed, the radial distance 28 between

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rule is 0.1% and 5% of a maximum radial height 29 of the second connecting element 9, as can be seen from FIG. The maximum

stand 28 defines the maximum height of the free space 20 in the radial direction.

According to another embodiment, it is also possible that the intermediate

Rule the first and second connecting element 8, 9 formed free space 20 in the lamella 5 for the engagement of auxiliary tools for mounting the lamella 5 can be formed. It is also possible that the aforementioned radi-

al distance 28 is greater than indicated above.

The second connecting element 9 can, as shown in FIGS. 2 and 3, be designed in a hump-shaped or lens-shaped or semi-oval manner, viewed in cross-section. However, the second connecting element 9 can also have a different cross-sectional shape, such as trapezoidal (see Fig. 4), triangular (see Fig. 5), semi-cylindrical (see Fig. 6), semi-elliptical, parabolic, ramp-shaped, polygonal, etc. The enumerated Shapes are to be understood as examples, even if they are preferred variants. The second connecting element 9 can also have a different cross-sectional shape, in particular if the design of the connection of the lamella 5 to the shaft 4 with the described (exclusively) two contact points or (exclusively) two contact areas

reached.

The second connecting element 9 can be designed with a constant radial height 29 in the axial direction of the shaft 4, at least in the area of the arrangement of the lamella(s) 5 (i.e. the laminated core) on the shaft 4. However, it is also possible that the radial height 29 becomes smaller over the axial course, so that the slipping of the lamellae 5 onto the shaft 4 can be carried out more easily through this ramp design. It is also possible that the shaft 4 outside the area of the arrangement of the lamella(s) 5 without the second connection

formation element 9 is formed.

After the first connecting element 8 is preferably produced by cutting from sheet metal, as was explained above, it has a

preferably has a thickness in the axial direction which is the thickness of the rest of the lamella

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5 corresponds. However, it can also be provided that the axial thickness of the first connecting element 8 is reduced, for example by machining, in order to improve the spring-elastic behavior. In this case, the first connecting member 8 may have a thickness in the axial direction of not less than 50% that of the thickness of the lamina 5 in the same direction. Thus, the first connecting element 8 can have a thickness in the axial direction between

50% and 100% of the thickness of the lamella 5 in the same direction.

In the foregoing, only one connection area with a first and a second connection element 8, 9 was described. However, it is possible that distributed over the circumference of the lamella 5 or the rotor 3, in particular distributed uniformly, several such connection areas with a first and a second connection element 8, 9 can be formed or arranged, for example two or three or four, etc. All connection areas are preferably designed in the same way, so that the above statements also apply

can be transferred to the other connection areas.

The exemplary embodiments show or describe possible variants, it being noted at this point that combinations of the individual

Variants among themselves are possible.

Furthermore, the rotor 3 can also be used in another assembly, for example in a multi-plate clutch. In addition, the first connecting element 8 can be part of a hub, which interacts with the second connecting element 9 formed on the shaft 4, so that a shaft-hub connection with a shaft 4 and with a hub, which is arranged on the shaft 4, wherein the hub has an opening through which the shaft 4 passes, and the hub has a first connecting element 8 which cooperates with a second connecting element 9 formed on the shaft 4, and being in the radial direction 12 above the first connecting element 8 in the hub an opening is formed, so that the first connecting element 8

is resiliently deformable, can represent an independent invention.

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Finally, for the sake of order, it should be pointed out that, for a better understanding of the structure, the electrical machine 1 or the rotor 3 or the load

melle 5 are not necessarily shown to scale.

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15

Reference List

machine

stator

rotor

Wave

Slat Slat body Opening Connection element Connection element Opening Circumferential direction Radial direction Section Section

angle

Wide mid-range Section Section Clearance

length

beam

Normal center cut angle width

Broad

Distance

Height

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Claims (14)

patent claims 1. Rotor (3) with a shaft (4) and with at least one lamella (5) which is arranged on the shaft (4), the lamella (5) having an opening (7) through which the shaft (4 ) is passed through, and wherein the lamella (5) has a first connecting element (8) which cooperates with a second connecting element (9) formed on the shaft (4), characterized in that in the radial direction (12) above the first connecting element ( 8) an opening (10) is formed in the lamella (5), so that the first connecting element ment (8) is resiliently deformable. 2. Rotor (3) according to claim 1, characterized in that the opening (10) formed above the first connecting element (8) in the la melle (5) is at least approximately crescent-shaped. 3. Rotor (3) according to claim 1 or 2, characterized in that the first connecting element (8) is arcuate. 4. Rotor (3) according to any one of claims 1 to 3, characterized in that the first connecting element (8) has two loads from one another in the circumferential direction. has spaced contact points or areas of contact with the shaft (4). 5. Rotor (3) according to claim 4, characterized in that the contact areas each extend over a length (21) which is between 0.1% and 10% of the total length of the first connecting element (8). 6. Rotor (3) according to claim 4 or 5, characterized in that normals (23) through the contact points or contact areas have a course that deviates from the radial direction (12) and is located outside the center point (24) of the shaft—viewed in the axial direction— with a cutting angle (25) cut. N2021/31300-AT-00 7. Rotor (3) according to claim 6, characterized in that the cutting angle (25) of the normal (23) is between 5° and 90°. 8. Rotor (3) according to any one of claims 1 to 7, characterized in that the first connecting element (8) has a radial width (26) of at most 40% the radial width (27) of the lamella (5). 9. Rotor (3) according to any one of claims 4 to 8, characterized in that between the first connecting element (8) and the second connecting element (9) outside the contact points or the contact areas, a radial distance (28) is formed, wherein the radial Distance (28) is between 0.1% and 5% of a maximum radial height (29) of the second connecting element (9). 10. Rotor (3) according to one of claims 1 to 9, characterized in that the second connecting element (9) viewed in cross-section is hump-shaped, semi-cylindrical, semi-liptical, parabolic, lenticular, ramp-shaped, trapezoidal shaped, triangular, polygonal. 11. Rotor (3) according to any one of claims 1 to 10, characterized in that the first connecting element (8) has a thickness in the axial direction between 50% and 100% of the thickness of the lamella (5) in the same direction. 12. Rotor (3) according to one of claims 1 to 11, characterized in that distributed over the circumference of the lamella (5) several first connecting elements (8) and distributed over the circumference of the shaft (4) several second connecting formation elements (9) are arranged. 13. Lamella (5) made of sheet metal for the rotor (3) of an electric Machine (1), wherein the lamella (5) has a lamella body (6) with a diameter N2021/31300-AT-00 break (7) through which a shaft (4) of the electrical machine (1) can be passed, and wherein the lamellar body (6) has a first connecting element (8) which is formed with a second connecting element (4) on the shaft (4). 9) interacts, characterized in that in the radial direction (12) above the first connecting element (8) in the lamella body (6) an opening (10) is formed, so that the first connecting element (8) spring- is elastically deformable. 14. Electrical machine (1), in particular an electric motor, comprising a stator (2) and a rotor (3), characterized in that the rotor (3) after one of claims 1 to 12. N2021/31300-AT-00