DE102016117111B4 - rotor for an electric machine - Google Patents

Abstract

Rotor (110, 110', 110'', 110''') for an electric machine (100, 100', 100'', 100''')
- comprising a laminated core (120) designed for arrangement on a shaft (111), with two radially extending side surfaces (121, 122) and an axially extending outer surface (123),
- comprising at least one cap element (200A, 200B, 300, 400A, 400B, 500) with at least one radially extending side surface (211A, 211B, 311, 411A, 411B, 511, 531) and an axially extending sleeve (220A, 220B, 320, 420A, 420B, 520) extending therefrom,
- wherein the at least one side surface (211A, 211B, 311, 411A, 411B, 511, 531) of the at least one cap element (200A, 200B, 300, 400A, 400B, 500) is arranged axially adjacent to one of the side surfaces (121, 122) of the laminated core (120) and
- wherein the sleeve (220A, 220B, 320, 420A, 420B, 520) of the at least one cap element (200A, 200B, 300, 400A, 400B, 500) at least partially encloses the outer surface (123) of the laminated core (120) in the axial direction, wherein
- the sleeve (220A, 220B) of the at least one cap element (200a, 200b) is wedge-shaped and tapers in the axial direction starting from the at least one side surface (211A, 211B, 311, 411A, 411B, 511, 531) of the at least one cap element (200A, 200B, 300, 400A, 400B, 500).

Description

The present invention relates to a rotor for an electrical machine comprising a laminated core arranged on a shaft, with two radially extending side surfaces and an axially extending outer surface.

State of the art

Electrical machines such as asynchronous machines or permanently excited synchronous machines comprise a stator and a rotor, the electromagnetic interaction of which causes a shaft to rotate.

For example, the JP 2002- 204 540 A a rotor of an electrical machine, wherein a rotor shaft has a section with an enlarged diameter. A cylindrical permanent magnet is firmly connected to this section by means of an adhesive. A cap is provided which completely envelops the rotor. An outer surface of the permanent magnet is covered by a cylindrical section of the cap. The side surfaces of the permanent magnet and the shaft section are covered by flange sections of the cap.

The CN 203 278 437 U shows a shaft with a rotor and a permanent magnet. The permanent magnet is attached to the outer surface of the rotor. An end plate is arranged axially adjacent to the rotor.

The rotor can, for example, comprise a laminated core arranged on the shaft, which is composed of a plurality of thin sheets arranged next to one another.

For example, from the DE 10 2014 106 614 A1 A rotor for an electrical machine and a method for its manufacture are known. Between two pressure disks, which are pressed onto a shaft in a force-fit manner, sheets are clamped to the shaft in a rotationally fixed manner. The sheets are combined to form one or more sheet packages. Other rotors for electrical machines are used, for example, in the DE 39 31 442 A1 and the DE 19 50 586 A described.

Such electrical machines can be used, for example, in motor vehicles, hybrid vehicles or electric vehicles to drive the vehicle as an alternative or in addition to an internal combustion engine. For this purpose, the shaft can be connected to a drive shaft of the vehicle in a rotationally fixed manner. This can often generate relatively high torques in the rotor, which places great loads on the rotor. For the effective operation of the vehicle, it is of great importance that the torques generated in the rotor can be effectively transferred to the shaft and thus ultimately to the drive shaft.

It is therefore desirable to provide a rotor for an electrical machine that can be subjected to high loads and used to transmit comparatively high torques.

disclosure of the invention

According to the invention, a rotor for an electrical machine is proposed with the features of independent patent claim 1. Advantageous embodiments are the subject of the subclaims and the following description.

The rotor has a laminated core designed for arrangement on a shaft with two radially extending side surfaces and an axially extending outer surface. The laminated core is designed in particular as a hollow cylinder. The laminated core is connected in particular to the shaft via an axially extending inner surface, e.g. in a form-fitting and/or force-fitting manner. The side surfaces in particular represent two sides of the laminated core that are opposite in the axial direction.

The rotor further comprises at least one cap element with at least one radially extending side surface and an axially extending sleeve extending therefrom. The at least one side surface of the at least one cap element is arranged axially adjacent to one of the side surfaces of the laminated core. The sleeve of the at least one cap element at least partially encloses or surrounds the outer surface of the laminated core in the axial direction. The sleeve is arranged in particular along the circumference of the side surface of the cap element. The sleeve can completely or at least partially enclose the laminated core in the circumferential direction.

The laminated core can in particular comprise a large number of individual sheets. The individual sheets can each be designed as thin disks or lamellae, the extent of which in the axial direction is much smaller than their extent in the radial direction. Several parts of the sheets can in particular also be combined to form a partial laminated core, one or more of these partial laminated cores can form the laminated core. The laminated core or the The individual sheets are connected to the shaft in a rotationally fixed manner.

The individual sheets can be connected to the sheet stack in a form-fitting and/or force-fitting and/or material-fitting manner. For example, the sheets can be connected in a force-fitting manner using punched studs. The sheets can be bonded to one another in a material-fitting manner using a so-called baking varnish. A material-fitting connection by welding is also conceivable.

The laminated core or the individual sheets can be connected to the shaft via a radial cross-press fit and/or via an axial clamping or an axial press fit. To create such a radial cross-press fit, the laminated core can be thermally shrunk on, for example. For this purpose, the shaft is cooled in particular and the laminated core is expediently heated. An axial press fit can be created, for example, as in the DE 10 2014 106 614 A1 described in that the sheets are clamped to the shaft in a rotationally fixed manner between pressure disks, the pressure disks being pressed onto the shaft in a force-fit manner. The sheet metal package is pressed with its side surfaces in particular against a limiting element, for example a pressure disk or a nut. This limiting element is connected to the shaft in a form-fitting and/or force-fitting and/or material-fit manner. The at least one cap element is expediently designed as such a limiting element. The sheet metal package is thus pressed against the side surface(s) of the cap element(s) and at least partially enclosed by the sleeve(s).

The electrical machine also has a stator, which expediently has one or more pole shoes. The sleeve is arranged in an air gap between the laminated core and the stator or pole shoe. A torque is generated by the laminated core or by the electromagnetic interaction of the stator and the rotor, and the shaft can be set in rotation. This torque generated in the laminated core can be transmitted in a force-locking or friction-locking manner to a point of pickup, for example to a gear at one end of the shaft, to which an element to be driven can be connected to the shaft in a rotationally fixed manner.

In conventional rotors, both in radial transverse interference fit and in axial interference fit, usually only a comparatively small part of the surface of the laminated core in general or of the individual laminations in particular can be used to transmit torque. With conventional laminated cores, torque is usually only transmitted to the shaft via the inner surface of the laminated core.

In contrast, in a rotor according to the invention, by using the shell that at least partially encloses the laminated core, a larger part of the surface of the laminated core or of the individual sheets can be used to transmit torque. In particular, in a rotor according to the invention, torque can be transmitted to the shaft not only via the inner surface of the laminated core but also via the outer surface and the two side surfaces. All surfaces of individual sheets can expediently contribute to torque transmission, i.e. in particular both axially extending surfaces (surface surfaces) and both radially extending surfaces (side surfaces).

By means of the rotor according to the invention, generated torques can thus be transmitted effectively, whereby the rotor is particularly well suited to transmitting comparatively high torques, e.g. greater than 500 Nm, and can withstand comparatively high loads without any problems. The rotor is expediently suitable for use at comparatively high speeds of the electrical machine and can be built small and compact.

In particular, at comparatively high speeds, the diameters of individual sheets and thus of the laminated core can expand due to centrifugal force, whereby the stress or pressure/press fit on the inner diameter of the sheets or the laminated core decreases and the stress or pressure/press fit on the outer diameter increases. In conventional rotors, this change in stress usually leads to a decrease in the transmitted torque. In contrast, the sleeve of the rotor according to the invention, which at least partially encloses the laminated core on its outer diameter, allows this increased stress on the outer diameter of the laminated core to be used for torque transmission. The sleeve thus serves in particular to compensate for centrifugal force or for expansion of the laminated core due to centrifugal force.

The sleeve of the at least one cap element is designed in particular as a thin layer. It is understood that the sleeve can also have an extension in the radial direction. However, the extension of the sleeve in the axial direction is expediently greater than its extension voltage in the radial direction. The sleeve, in particular its inner surface, expediently runs parallel to the outer surface of the laminated core. In particular, there is no or essentially no distance between the laminated core and the sleeve, the inner surface of the sleeve and the outer surface of the laminated core in particular lie against one another.

Advantageously, the sleeve of the at least one cap element completely encloses the outer surface of the laminated core in the axial direction. Such complete enveloping of the laminated core proves to be particularly advantageous when torques are also generated in the middle region of the laminated core.

According to a preferred embodiment, such a complete enclosure can be realized with exactly one cap element with one side surface. This side surface of exactly one cap element is arranged axially adjacent to one of the side surfaces of the laminated core. The sleeve of this one cap element advantageously completely encloses the outer surface of the laminated core in the axial direction. Only a single cap element is therefore required, which enables a low-complexity design of the rotor. The individual sheets can be easily inserted into the hollow space of the sleeve.

In this case, a clamp element is preferably provided next to the one cap element, which is arranged axially adjacent to the side surface of the laminated core opposite the side surface of the one cap element. The sleeve of the cap element is preferably fastened in the clamp element. For example, the sleeve can be fastened in the clamp element in a force-fitting and/or form-fitting manner, for example by inserting, clamping, gluing, etc., or also in a material-fitting manner, for example by welding or fusing. The clamp element can thus be used to fix the sleeve and in particular also for the axial clamping of the sheets.

Alternatively, the complete enveloping of the outer surface of the laminated core can advantageously be achieved by means of two cap elements, each of which has a side surface. The side surfaces of these two cap elements are preferably arranged axially adjacent to one of the side surfaces of the laminated core and are thus expediently arranged on the opposite side surfaces of the laminated core. The sleeves of these two cap elements partially enclose the outer surface of the laminated core in the axial direction in such a way that the outer surface of the laminated core is completely enclosed by the sleeves of the two cap elements. Each of the sleeves thus encloses the part of the laminated core that is not enclosed by the other sleeve. The sleeves can each be constructed identically and thus each enclose an equal part of the laminated core, i.e. 50% each, or they can also be constructed differently and enclose different proportions of the outer surface, e.g. 40% and 60%. The two sleeves can be connected to one another in a force-fitting and/or form-fitting and/or material-fitting manner, in particular by means of a plug connection. This design of the rotor can be implemented with little effort, and individual cap elements can be easily replaced if required.

The complete enclosure can alternatively also be realized by means of at least one cap element, which has two side surfaces and a sleeve. These two side surfaces of the cap element are preferably arranged axially adjacent to one of the side surfaces of the laminated core, i.e. on the opposite side surfaces of the laminated core. The sleeve completely encloses the outer surface of the laminated core in the axial direction.

According to an advantageous embodiment, the rotor has two cap elements, each with a side surface. The side surfaces of these two cap elements are each arranged axially adjacent to one of the side surfaces of the laminated core and thus lie on the opposite sides of the laminated core. Preferably, the sleeves of these two cap elements each enclose only a part of the outer surface of the laminated core, preferably up to 25%, more preferably up to 15%, more preferably up to 10% of the outer surface. The surface is therefore not completely enclosed. For example, in the case of axial clamping, the torques generated in the individual sheets increasingly add up towards the side surfaces of the laminated core. In this case, the sleeves can in particular be designed in such a way that they enclose this area of the surface to transmit torque.

Preferably, the at least one cap element is designed as at least one disk, from whose outer circumference the sleeve extends. In particular, the disk is connected to the shaft in a rotationally fixed manner, e.g. positively and/or non-positively and/or materially, and can expediently serve as a limiting element for the axial clamping. Thus, the cap element can be used both for the axial clamping and for the improve torque transmission.

According to the invention, the sleeve of the at least one cap element is wedge-shaped and tapers in the axial direction starting from the at least one side surface of the at least one cap element. For example, the sleeve can thus have its greatest extension in the radial direction in an area of the laminated core near the side surface in which torque is generated and is to be transmitted. The cap element can thus be built small and save material.

The sleeve of the at least one cap element is advantageously made of a non-ferromagnetic material. This prevents the electromagnetic interaction between the rotor and stator of the electrical machine from being negatively influenced by the sleeve. In particular, the air gap magnetic field of the air gap between the laminated core and the stator or pole shoe is also not negatively influenced.

Advantageously, the rotor can be manufactured according to a method which is described in DE 10 2014 106 614 A1 is disclosed. Instead of the pressure disks described in this publication, at least one cap element with a sleeve can preferably be used. The sheets are preferably pushed onto the shaft and rest against a cap element which is arranged in a first section of the shaft. A second cap element or a clamp element or a pressure disk can be pressed onto the sheets on a second section of the shaft in a force-fitting manner under axial tension.

Preferably, a cap element with a sleeve can be applied or pressed onto the shaft. For this purpose, the outer surface profile can be widened in a first section of the shaft. The sheets can be threaded onto the shaft without force and placed against the cap element that serves as a pressure disk. A second cap element or a clamp element or a pressure disk can then be pressed onto the shaft while bracing the sheets. For this purpose, too, the outer surface profile of the shaft can be widened in a second section.

The electrical machine can be designed, for example, as an asynchronous machine or as a permanently excited synchronous machine and can be used, for example, in a motor vehicle, hybrid or electric vehicle or commercial vehicle, e.g. in a passenger car, a motorcycle, a bus, a train, etc., or in a vehicle that can be operated away from paved roads, e.g. in an off-road vehicle (Unimog, amphibious vehicles, snow groomer, etc.), in an ATV (all-terrain vehicle, e.g. a quad) or in a snowmobile. It is also conceivable to use the electrical machine in aircraft or watercraft. It is also conceivable to use the electrical machine to drive a passenger transport device (e.g. elevator, escalator, moving walkway, etc.).

Further advantages and embodiments of the invention emerge from the description and the accompanying drawings.

It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

The invention is illustrated schematically in the drawing using an embodiment and is described below with reference to the drawing.

character description

• 1 to 5 each show schematically an electrical machine with a preferred embodiment of a rotor according to the invention in a longitudinal sectional view.
• 6 shows schematically a sheet which can be used for a laminated core of a preferred embodiment of a rotor according to the invention.
• 7 shows schematically an electric machine with a preferred embodiment of a rotor according to the invention in a cross-sectional view.

Identical reference symbols in the figures indicate identical or structurally identical elements and are not explained separately.

In 1 an electric machine is shown schematically in a longitudinal sectional view and designated 100. The electric machine 100 has a stator 130 and a preferred embodiment of a rotor 110 according to the invention. The electric machine 100 can be designed, for example, for use in a hybrid vehicle in order to drive the hybrid vehicle.

The rotor comprises a shaft 111, at the end of which a toothing 112 is attached, via which an element to be driven is connected to the shaft 111 can be connected in a rotationally fixed manner, for example a drive shaft of the hybrid vehicle. An axis of rotation about which the shaft 111 is rotatably mounted is designated 101.

A laminated core 120 made of a plurality of individual sheets is arranged on the shaft 111 and is connected to the shaft 111 in a rotationally fixed manner. The laminated core 120 has two side surfaces 121 and 122, each extending radially, i.e. perpendicular to the axis of rotation 101, and an outer surface 123 extending axially, i.e. parallel to the axis of rotation 101.

According to a preferred embodiment of the invention, the rotor 110 has two cap elements 200A and 200B of identical construction. Each of these cap elements 200A and 200B has a disk 210A and 210B with a radially extending side surface 211A and 211B. A sleeve 220A and 220B extends axially on the side surface 211A and 211B.

As in 1 As shown, a first of these two cap elements 200A is arranged with its side surface 211A axially adjacent to the left side surface 121 of the laminated core 120 and a second of these two cap elements 200B is arranged with its side surface 211B axially adjacent to the right side surface 122 of the laminated core 120.

In particular, the cap elements 200A and 200B serve as limiting elements against which the sheets of the laminated core 120 are pressed. The sheets are thus connected to one another in a force-fitting manner by means of an axial clamping or an axial press fit.

The sleeves 220A and 220B of the cap elements 200A, 200B enclose in the example of 1 only a part of the outer surface 123 of the laminated core 120, for example 10% of the outer surface 123. Such a design of the rotor 110 is particularly suitable for axial clamping of the laminated core 120, since in this case torques are generated in particular on the side surfaces 121, 122 of the laminated core 120 and in an area of the surface 123 adjacent to the side surfaces 121, 122. The sleeves 220A, 200B enclose in particular this area of the surface, whereby the torque generated there can be effectively transmitted to the shaft 111.

The sleeves 220A, 200B are wedge-shaped according to the invention and taper in the axial direction. The area marked with the letter “B” is in 1 shown again enlarged. In this enlarged section, the tapered shape of the sleeve 220B can be seen.

To explain how torque can be transmitted from the laminated core 120 to the shaft 111 by means of the cap elements 220A, 200B, the electric machine 100 is made of 1 analog in 2 shown schematically. In 2 Furthermore, torques are shown which are generated by electromagnetic interaction between the laminated core 120 and the rotor 130.

The upper half of 2 The triangles shown symbolize the course of the torques generated on the laminated core 120. The in the lower half of 2 The arrowheads shown symbolize the torques generated at specific areas of the laminated core 120.

M _al is an axially directed torque that acts on the left side surface 121 of the laminated core 120. As can be seen from the associated profile triangle ΔM _al , this torque acts most strongly directly on the left side surface 121 and decreases with increasing distance from the left side surface 121. In particular, no or hardly any such torque is generated in the middle between the left side surface 121 and the right side surface 122.

Analogously, M _ar denotes an axially directed torque on the right side surface 122. As can be seen from the corresponding curve triangle ΔM _ar , this torque analogously acts most strongly directly on the right side surface 122.

M _ra is a radially directed torque which acts on the outer surface 123 of the laminated core 120. As can be seen from the associated profile triangle ΔM _ra , this torque acts most strongly directly on areas of the outer surface which border on the side surfaces 121, 122.

M _ri is a radially directed torque which acts on the inner surface of the laminated core 120. According to the associated gradient triangle ΔM _ri, this torque acts more strongly the closer the inner surface is to the right side surface 122.

In particular, a torque is generated in each individual sheet of the laminated core 120, in particular in each case of the same magnitude. However, the individual moments of the sheets add up in the case of axial clamping as in 2 shown, increasing in a triangular shape towards the sides. In a rotor which is connected to the shaft via a pure axial clamping (as for example in the DE 10 2014 106 614 A1 shown), the total torque would be formed exclusively by the axially directed torques M _al and M _ar . In a purely radial transverse interference fit, without lateral pressure plates, the total torque would be formed exclusively by the radially directed torque M _ri .

In in 2 In the case shown, the laminated core 120 is preferably connected to the shaft 111 by both axial clamping and radial cross-pressing. The total torque in this case is thus: $${\text{M}}_{\text{ges}}={\displaystyle \sum \left({\text{M}}_{\text{ri}}+{\text{M}}_{\text{al}}+{\text{M}}_{\text{ar}}+{\text{M}}_{\text{ra}}\right)}$$

In particular, the proportion of the individual moments in the total torque changes with the speed n. The higher the speed, the lower M _ri and the higher M _ra .

The sleeves of the cap elements 200A and 200B therefore enclose in particular the areas of the laminated core on which higher, cumulatively generated torques act. The dashed line marked M _total in 2 symbolizes how the generated torques are transmitted via the sleeves on the shaft 111 to the gearing 112.

According to an alternative preferred embodiment of the invention, the laminated core 120 can also be completely enclosed by the sleeves of the cap elements, as described below with reference to the 3 to 5 is explained.

In 3 is an electrical machine 100' analogous to 1 and 2 with a further preferred embodiment of a rotor 110' according to the invention shown schematically in a longitudinal sectional view. The rotor 110' has exactly one cap element 300 with a disk 310, a side surface 311 and a sleeve 320. The cap element 300 is arranged with its side surface 311 axially adjacent to the left side surface 121 of the laminated core 120. The sleeve 320 completely encloses the laminated core 120. Axially adjacent to the right side surface 122 of the laminated core 120 is a clamp element 330 in which the sleeve 320 of the cap element 300 is fastened, e.g. inserted into a groove 331. The groove 331 is comparatively deep in order to compensate for axial tolerance compensation and the build-up of compressive stresses. The cap element 300 and the clamp element 330 serve in particular as limiting elements for the axial clamping of the sheets.

In 4 is an electric machine 100" analogous to the 1 to 3 with a further preferred embodiment of a rotor 110" according to the invention is shown schematically in a longitudinal sectional view. The rotor 110" in this example has two identically designed cap elements 400A and 400B, each with a disk 410A or 410B, a side surface 411A or 411B and a sleeve 420A or 420B. A first of these two cap elements 400A is arranged with its side surface 411A axially adjacent to the left side surface 121 of the laminated core 120 and a second cap element 400B is arranged with its side surface 411B axially adjacent to the right side surface 122. In this example, the sleeve 420A or 420B of each cap element 400A or 400B encloses half of the outer surface 123 of the laminated core 120. The sleeves 420A and 420B can be attached to one another, e.g. inserted into one another. An area “C” in which the sleeves 420A and 420B are inserted into one another is shown in 4 shown enlarged. A groove 421B is provided in the sleeve 420B for this purpose. The groove 421B is comparatively deep to compensate for axial tolerance compensation and the build-up of compressive stresses. The cap elements 400A and 400B also serve in particular as limiting elements for the axial clamping of the sheets.

In 5 is an electrical machine 100''' analogous to the 1 to 4 with a further preferred embodiment of a rotor 110''' according to the invention is shown schematically in a longitudinal sectional view. The rotor 110''' in this example has a cap element 500 with a first disk 510 and a first side surface 511 as well as with a second disk 530 and a second side surface 531. The cap element 500 is arranged with its first side surface 511 axially adjacent to the left side surface 121 of the laminated core 120 and with its second side surface 531 axially adjacent to the right side surface 122. The cap element 500 also has a sleeve 520 which is arranged on both disks 510 and 530 and which completely encloses the outer surface 123 of the laminated core 120. The cap element 500 with its disks 510 and 530 serves in particular as limiting elements for the axial clamping of the sheets.

In 6 a sheet is shown schematically in a perspective view and designated 600, which can be used for a laminated core of a preferred embodiment of a rotor according to the invention. In particular, all surfaces of such a sheet 600 can contribute to the torque transmission through the rotor, in particular both axially extending surfaces, i.e. a left lateral surface 611 and a right lateral surface 612, as well as both radially extending surfaces, i.e. an inner side surfaces 621 and an outer side surface 622.

In 7 the electric machine is 100''' from 5 shown schematically in a cross-sectional view. A sheet 600 according to 6 of the laminated core 120. The sleeve 520 of the cap element 500 is arranged on the outer surface 123 of the laminated core or the sheet 600.

list of reference symbols

100, 100', 100'', 100'''

electric machine

101

axis of rotation

110, 110', 110'', 110'''

rotor

111

Wave

112

gearing

120

sheet metal package

121

left side surface of the laminated core

122

right side surface of the laminated core

123

outer surface of the laminated core

130

stator

200A, 200B

cap element

210A, 210B

disc of the cap element

211A, 211B

side surface of the cap element

220A, 220B

sleeve of the cap element

300

cap element

310

disc of the cap element

311

side surface of the cap element

320

sleeve of the cap element

330

clamp element

331

Nut

400A, 400B

cap element

410A, 410B

disc of the cap element

411A, 411B

side surface of the cap element

420A, 420B

sleeve of the cap element

421B

Nut

500

cap element

510

first disc of the cap element

511

first side surface of the cap element

520

sleeve of the cap element

530

second disc of the cap element

531

second side surface of the cap element

600

sheet metal

611

left surface of the sheet metal

612

right-hand surface of the sheet metal

621

inner side surfaces of the sheet

622

outer side surface of the sheet

Just

axially directed, left torque

ΔMal

Course of the axially directed, left torque

Mar

axially directed, right torque

ΔMar

Course of the axially directed, right torque

Mra

radially directed, external torque

ΔMra

Course of the radially directed, external torque

MRI

radially directed, internal torque

ΔMri

Course of the radially directed, internal torque

Mges

total torque generated

Claims (10)

Rotor (110, 110', 110'', 110''') for an electrical machine (100, 100', 100'', 100''') - comprising a for arrangement on a shaft (111) designed laminated core (120), with two radially extending side surfaces (121, 122) and an axially extending outer surface (123), - having at least one cap element (200A, 200B, 300, 400A, 400B, 500) with at least one radially extending side surface (211A, 211B, 311, 411A, 411B, 511, 531) and an axially extending sleeve (220A, 220B, 320, 420A, 420B, 520) extending therefrom, - wherein the at least one side surface (211A, 211B, 311, 411A, 411B, 511, 531) of the at least one cap element (200A, 200B, 300, 400A, 400B, 500) is arranged axially adjacent to one of the side surfaces (121, 122) of the laminated core (120) and - wherein the sleeve (220A, 220B, 320, 420A, 420B, 520) of the at least one cap element (200A, 200B, 300, 400A, 400B, 500) at least partially encloses the outer surface (123) of the laminated core (120) in the axial direction, wherein - the sleeve (220A, 220B) of the at least one cap element (200a, 200b) is wedge-shaped and extends from the at least one side surface (211A, 211B, 311, 411A, 411B, 511, 531) of the at least one cap element (200A, 200B, 300, 400A, 400B, 500) tapers in the axial direction. Rotor (110', 110'', 110''') after claim 1 , wherein the sleeve (320, 420A, 420B, 520) of the at least one cap element (300, 400A, 400B, 500) completely encloses the outer surface (123) of the laminated core (120) in the axial direction. Rotor (110') after claim 2 with exactly one cap element (300) with a side surface (311), wherein the side surface (311) of this exactly one cap element (300) is arranged axially adjacent to one of the side surfaces (121) of the laminated core (120) and wherein the sleeve (320) of this cap element (300) completely encloses the outer surface (123) of the laminated core (120) in the axial direction. Rotor (110') after claim 3 with a clamp element (330) which is arranged axially adjacent to the side surface (122) of the laminated core (120) opposite the side surface (311) of exactly one cap element (300), wherein the sleeve (320) of exactly one cap element (300) is fastened in the clamp element (330). Rotor (110'') after claim 2 with two cap elements (400A, 400B) each having a side surface (411A, 411B), wherein the side surfaces (411A, 411B) of these two cap elements (400A, 400B) are each arranged axially adjacent to one of the side surfaces (121, 122) of the laminated core (120), wherein the sleeves (420A, 420B) of these two cap elements (400A, 400B) each partially enclose the outer surface (123) of the laminated core (120) in the axial direction such that the outer surface (123) of the laminated core (120) is completely enclosed by the sleeves (420A, 420B) of the two cap elements (400A, 400B). Rotor (110''') after claim 2 , wherein the at least one cap element (500) has two side surfaces (511, 531), wherein the two side surfaces (511, 531) of the at least one cap element (500) are each arranged axially adjacent to one of the side surfaces (121, 122) of the laminated core (120), and wherein the sleeve (520) of the at least one cap element (500) completely encloses the outer circumferential surface (123) of the laminated core (120) in the axial direction. Rotor (110''') after claim 6 , wherein the two side surfaces (511, 531) and the sleeve (520) of the cap element (500) are formed as a common structural unit. Rotor (110) after claim 1 with two cap elements (200A, 200B) each having a side surface (211A, 211B), wherein the side surfaces (211A, 211B) of these two cap elements (200A, 200B) are each arranged axially adjacent to one of the side surfaces (121, 122) of the laminated core (120), wherein the sleeves (220A, 220B) of these two cap elements (200A, 200B) each enclose up to 25%, in particular up to 15%, in particular up to 10% of the outer surface (123) of the laminated core (120). Rotor (110, 110', 110'', 110''') according to one of the preceding claims, wherein the at least one cap element (200A, 200B, 300, 400A, 400B, 500) is designed as at least one disk (210A, 210B, 310, 410A, 410B, 510, 530), from the outer circumference of which the sleeve (220A, 220B, 320, 420A, 420B, 520) extends. Rotor (110, 110', 110'', 110''') according to one of the preceding claims, wherein the sleeve (220A, 220B, 320, 420A, 420B, 520) of the at least one cap element (200A, 200B, 300, 400A, 400B, 500) is made of a non-ferromagnetic material.

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