DE102019208099A1 - Rotor for an electrical machine, method for producing a rotor and electrical machine with a rotor - Google Patents

Abstract

The invention relates to a rotor (10) for an electrical machine, with a laminated core (16) arranged in the axial direction of the rotor (10), which has a first end face (20) and one to the first end face (20) in the axial direction of the laminated core ( 16) has a second end face (22) arranged spaced apart, a first end disk (24) arranged on the first end face (20), and a second end disk (26) arranged on the second end face (22), the first end disk (24), the laminated core (16) and the second end disk (26) each have an armature receiving opening (28) running parallel to the rotor axis (12) of the rotor (10), and one through the armature receiving opening (28) of the first end disk (24), the laminated core ( 16) and the second end plate (26) guided tie rods (30) for bracing the laminated core (16) in the axial direction, wherein the tie rod (30) at a distal end section (31) has at least one anchoring section (32) with one arranged thereon Has locking ring (46), the anchoring section (32) being designed such that the locking ring (46) is permanently connected to the anchoring section (32).

Description

The invention relates to a rotor for an electrical machine, the rotor having a laminated core which is braced in the axial direction via a tie rod. On a distal end section of the tie rod, an anchoring section is formed, on which a locking ring is arranged, the locking ring being permanently connected to the anchoring section. The invention also relates to a method for producing an axially preloaded rotor with a tie rod guided through a laminated core of the rotor for axially bracing the laminated core, the tie rod being permanently anchored to a locking ring for bracing the laminated core. The invention also relates to an electrical machine with the rotor according to the invention.

Rotors for electrical machines, in particular for use in electromobility, are known in principle. The known rotors generally have a rotor shaft on which a laminated rotor core is arranged. It is also known that an end disk is arranged on the end of the laminated rotor core. End plates are also commonly referred to as thrust washers. Tie rods for prestressing the laminated core can be guided through the laminated rotor core and the end disks. Pre-tensioning the laminated core can be advantageous in order to reduce the torque ripple of the rotor, in particular at high speeds.

Known tie rods of this type are usually passed through the end disks and the laminated rotor core and are preloaded in the axial direction by a nut screwed onto the tie rod at the end in order to clamp the laminated rotor core in the axial direction of the rotor. The long tie rods can usually be easily tightened over the screwed-on nut. However, due to their installation position and the high rotor speeds of more than 14,000 rpm, they can experience an unfavorable bending moment, which, together with vibrations, caused by residual imbalances in the rotor and temperature changes, can lead to loosening of the screw connections.

It is the object of the invention to provide a rotor for an electrical machine which has a secure and permanent bracing of the laminated core in the axial direction.

This object is achieved by the subject matter of the independent patent claims. Preferred developments and / or configurations of the invention are specified in the description, the drawings and the subclaims, each feature being able to represent an aspect of the invention both individually and in combination.

According to the invention, a rotor for an electrical machine is provided, with a laminated core arranged in the axial direction of the rotor, which has a first end face and a second end face arranged at a distance from the first end face in the axial direction of the laminated core, a first end plate arranged on the first end face, and a second end disk arranged on the second end face, the first end disk, the laminated core and the second end disk each having an armature receiving opening running parallel to the rotor axis or longitudinal axis of the rotor, and a tie rod guided through the armature receiving opening of the first end disk of the laminated core and the second end disk for bracing the laminated core in the axial direction, characterized in that the tie rod has at least one anchoring section with a locking ring arranged thereon at a distal end section, the anchoring section being designed such that the Closing ring is inextricably connected to the anchoring section.

In other words, it is an aspect of the present invention that a rotor is provided for an electrical machine. The electrical machine is preferably set up and / or designed for use in an at least partially electrically driven motor vehicle. In particular, the electrical machine is preferably used in the drive train of the at least partially electrically driven motor vehicle.

The rotor of the electrical machine has a laminated core. The laminated core is usually also referred to as the laminated rotor core. The laminated core is preferably arranged non-rotatably on a rotor shaft or on a laminated core carrier of a built shaft. The rotor shaft is preferably designed in one piece. The assembled shaft generally has a hollow cylinder-shaped laminated core carrier with shaft journals arranged and / or flanged on the end of the laminated core carrier.

The laminated core can have one or more laminated core segments which are arranged one behind the other in the axial direction of the rotor. A laminated core segment in turn preferably comprises several sheets arranged one behind the other. The laminated core of the rotor has a first end face and a second end face arranged at a distance from the first end face in the axial direction of the laminated core. A first end plate is arranged on the first end face and a second end plate is arranged on the second end face. An end plate is also commonly called a thrust washer designated. The laminated core is consequently arranged between the first end disk and the second end disk.

Running parallel to the rotor axis or longitudinal axis of the rotor, the first end disk, the laminated core and the second end disk have at least one armature receiving opening. A tie rod is passed through the armature receiving opening of the first end disk, the laminated core and the second end disk in order to brace the laminated core in the axial direction. The rotor preferably has, through the first end disk, the laminated core and the second end disk, a plurality of armature receiving openings arranged at a distance from one another in the circumferential direction, through which a tie rod is guided in each case.

On a distal end section, the tie rod has at least one anchoring section with a locking ring arranged thereon. The anchoring section of the tie rod particularly preferably engages in the locking ring. The locking ring is preferably pressed onto the anchoring section. The anchoring section is designed such that the locking ring is permanently connected to the anchoring section. This means that even with one rotation of the locking ring around the longitudinal axis of the tie rod, there is no loss of the prestressing of the laminated core. Accordingly, a rotor for an electrical machine is provided which can ensure permanent tensioning of the laminated core at high rotational speeds - even in the event of shocks, vibrations and / or temperature fluctuations of the rotor.

An advantageous development of the invention is that the locking ring is an at least partially or sectionally plastically deformable sleeve that can be plugged onto the anchoring section. In other words, the locking ring can be slipped onto the anchoring section and, after the tensioning of the tie rod and / or the laminated core, can be plastically deformed at least partially or in sections using a locking ring forming tool, so that a form fit between the locking ring and the anchoring section of the tie rod is associated with the pretensioning force of the tie rod to be transferred to the laminated core via the locking ring and the end plates.

Alternatively, a preferred development of the invention is that the locking ring is integrally connected to the first end plate and / or the second end plate. In this way, relative rotation of the locking ring to the first end disk and / or the second end disk can be prevented.

The locking ring is preferably arranged on a side of the first end disk and / or the second end disk facing away from the laminated core. In this way, the locking ring can be plastically deformed at least partially or in sections, preferably completely, in a simple manner by means of a locking ring molding tool, in order to be able to enter into a form fit with the anchoring section of the tie rod.

In an advantageous development of the invention it is provided that the locking ring is plastically deformed at least in sections. This means that the locking ring is not deformed over its entire axial length in which it is slipped onto the anchoring section. It is completely sufficient if at least part of the locking ring is plastically deformed and a form fit is associated with the anchoring section of the tie rod.

In principle, it can advantageously be provided that the locking ring is plastically deformed over its entire axial length in order to enter into the form fit with the anchoring section of the tie rod. In this way, an increased prestressing force of the tie rod can be transmitted via the form fit between the locking ring and anchoring section in order to brace the laminated core in the axial direction.

A preferred further development of the invention is that the locking ring has, at least in sections, a conical outer jacket surface which tapers or tapers in cross-section in the direction of a free end of the anchoring section. In this way, the locking ring can be plastically deformed, at least in sections, by means of a corresponding locking ring molding tool that is placed and / or pressed onto the conically designed outer surface.

In principle, it can be provided that the anchoring section is designed in such a way that when the anchoring section is positively locked with the locking ring, even when the locking ring rotates around the longitudinal axis of the tie rod, the locking ring is prevented from becoming detached from the tie rod.

A preferred development of the invention is that the tie rod section has at least one circumferential depression, groove and / or groove formed in the circumferential direction of the tie rod. This means that the anchoring section does not have a thread with a pitch, but rather the recess, groove and / or groove is designed in the circumferential direction as an axially symmetrical recess rotating about the longitudinal axis. If the locking ring should be positioned around the longitudinal axis of the Can rotate the tie rod, this would not cause any displacement of the tie rod and / or locking ring in the axial direction due to the circumferential recess, groove and / or groove formed in the circumferential direction. In this way it can be prevented that, when the tie rod is rotated about its longitudinal axis relative to the locking ring, there is no loss of the prestress of the laminated core.

In this context, a preferred development of the invention is that the anchoring section has a plurality of circumferential depressions, grooves and / or grooves that are arranged one behind the other in the axial direction of the tie rod and / or spaced apart from one another in the axial direction of the tie rod. The locking ring thus engages in the plurality or plurality of circumferential depressions, grooves and / or grooves in order to form a form fit with them. Due to this pronounced form fit between the locking ring and the majority of the depressions, grooves and / or grooves, an increased prestressing force of the tie rod can be introduced into the end plates and thus into the laminated core via the locking ring.

An advantageous further development of the invention is that the tie rod, adjacent to the anchoring section, facing a free end of the tie rod, has a clamping wedge receptacle for latching with a tie rod clamping device. The clamping wedge receptacle is preferably an upstand formed outward in the radial direction. The upstand can preferably be designed in sections and very particularly preferably all around. A circumferential configuration of the tensioning wedge receptacle can have the advantage that the tie rod tensioning device can lock onto the tensioning wedge receptacle in a simple manner, that is to say independently of the position of the tension rod in the receiving opening.

In an advantageous development of the invention it is provided that the tie rod has an anchor head at an end facing away from the anchoring section, and the first end disk or the second end disk has an anchor head receptacle, and the anchoring section of the tie rod is passed through the other end disk. In other words, the tie rod has an anchor head at one end and the anchoring section at the other end. The tie rod is guided with the anchoring section first through the anchor receiving opening of the first end plate, the laminated core and the second end plate. The first end plate preferably has an anchor head receptacle which corresponds to the anchor head and in which the anchor head engages.

In principle, it can be the case that the anchor head is arranged and / or designed in the anchor head receptacle in such a way that the tie rod is not rotatably arranged in the anchor receptacle. The anchor head can be designed, for example, with a groove and / or a projection, and the anchor head receptacle can have a design corresponding to the groove and / or recess, so that in this way a form fit is created between the anchor head and anchor head receptacle, so that the anchor when the Anchor head is arranged in the anchor head receptacle, is no longer rotatable about its longitudinal axis.

If, in this context, the locking ring is also connected in one piece to the second end disk, a rotation of the locking ring relative to the tie rod about its longitudinal axis can be prevented.

A preferred development of the invention lies in the fact that the anchor head has a conical configuration which tapers in the direction of the anchoring section, and the anchor head receptacle is configured to correspond to the anchor head. The anchor head is accordingly designed like a countersunk head and the anchor head receptacle correspondingly corresponds. The anchor head, which is designed as a countersunk head, and the form-fitting connection of the anchoring section with the locking ring, allows a bending moment caused by centrifugal forces to be safely absorbed in the tie rod.

The invention also relates to an electrical machine, preferably for arrangement in a drive train of an at least partially electrically driven motor vehicle, comprising the rotor according to the invention.

• - Bereitstellen eines Blechpakets;
• - Anordnen einer ersten Endscheibe auf einer ersten Stirnseite des Blechpakets;
• - Anordnen einer zweiten Endscheibe auf einer zweiten Stirnseite des Blechpakets;
• - Anordnen eines Zugankers durch eine Ankeraufnahmeöffnung der ersten Endscheibe, des Blechpakets und der zweiten Endscheibe, wobei der Zuganker zumindest mit der ersten Endscheibe rückverankert ist, und ein Verankerungsabschnitt des Zugankers durch die zweite Endscheibe und durch eine Schließring geführt ist;
• - Vorspannen des Zugankers und des Blechpakets in axialer Richtung des Blechpakets und/oder des Zugankers;
• - Zumindest abschnittsweise plastische Verformung des Schließrings, so dass diese unlösbar mit dem Verankerungsabschnitt des Zugankers verbunden wird.

The invention also relates to a method for producing the rotor according to the invention, comprising the steps:

• - Providing a laminated core;
• - Arranging a first end plate on a first end face of the laminated core;
• - Arranging a second end plate on a second end face of the laminated core;
• Arranging a tie rod through an armature receiving opening of the first end disk, the laminated core and the second end disk, wherein the tie rod is anchored back at least to the first end disk, and an anchoring section of the tie rod is guided through the second end disk and through a locking ring;
• - Pre-tensioning the tie rod and the laminated core in the axial direction of the laminated core and / or the tie rod;
• - At least in sections, plastic deformation of the locking ring, so that it is permanently connected to the anchoring section of the tie rod.

A preferred further development of the invention is that, to pretension the tie rod, a tie rod tensioning device is placed on a free end section of the tie rod, locked with a clamping wedge receptacle of the tie rod, and the tie rod and the laminated core are preloaded in the axial direction by shifting the tie rod tensioning device. In this way, the tie rod is pretensioned in that the tie rod tensioning device engages with the tension wedge receptacle of the tie rod and is shifted in the axial direction to the laminated core. Due to the fact that the tie-rod tensioning device is supported on the laminated core, the laminated core is also pretensioned by the axial displacement of the tie-rod tensioning device.

An advantageous development of the invention is that for at least partial plastic deformation of the locking ring, a locking ring forming tool that is arranged coaxially to the tie-rod tensioning device is placed and / or pressed onto the locking ring and the locking ring is at least partially plastically deformed. In this way, by displacing the locking ring forming tool arranged coaxially to the tie rod tensioning device, the locking ring seated on the anchoring section can be plastically deformed in a simple manner, at least in sections.

Further features and advantages of the present invention emerge from the subclaims and the following exemplary embodiments. The exemplary embodiments are not to be understood as restrictive, but rather as examples. They are intended to enable those skilled in the art to carry out the invention. The applicant reserves the right to make individual or several of the features disclosed in the exemplary embodiments the subject of patent claims or to include such features in existing patent claims. The exemplary embodiments are explained in more detail with reference to drawings.

• 1 eine dreidimensionale Ansicht eines Rotors für eine elektrische
• Maschine, gemäß einem Ausführungsbeispiel der Erfindung;
• 2 einen Zuganker zum Vorspannen eines Blechpakets des Rotors, gemäß einem bevorzugten Ausführungsbeispiel der Erfindung;
• 3 einen Verankerungsabschnitt des Zugankers, gemäß dem bevorzugten Ausführungsbeispiel der Erfindung;
• 4 eine Längsansicht des Rotors, gemäß dem bevorzugten Ausführungsbeispiel der Erfindung;
• 5 einen Schnitt durch den Rotor im Bereich einer ersten Endscheibe und eines Blechpakets, gemäß dem bevorzugten Ausführungsbeispiel der Erfindung;
• 6 einen Schnitt durch den Rotor im Bereich einer zweiten Endscheibe und dem Blechpaket, gemäß dem bevorzugten Ausführungsbeispiel der Erfindung;
• 7 - 10 ein Verfahren zum Vorspannen des Zugankers und zum plastischen Verformen eines Schließrings auf dem Verankerungsabschnitt des Zugankers, gemäß dem bevorzugten Ausführungsbeispiel der Erfindung.

In these show:

• 1 a three-dimensional view of a rotor for an electrical
• Machine, according to an embodiment of the invention;
• 2 a tie rod for prestressing a laminated core of the rotor, according to a preferred embodiment of the invention;
• 3 an anchoring portion of the tie rod, according to the preferred embodiment of the invention;
• 4th a longitudinal view of the rotor, according to the preferred embodiment of the invention;
• 5 a section through the rotor in the area of a first end disk and a laminated core, according to the preferred embodiment of the invention;
• 6th a section through the rotor in the area of a second end plate and the laminated core, according to the preferred embodiment of the invention;
• 7th - 10 a method for prestressing the tie rod and for the plastic deformation of a locking ring on the anchoring section of the tie rod, according to the preferred embodiment of the invention.

In 1 is a rotor 10 shown for an electric machine. The electric machine is preferably an electric motor for driving an at least partially electrically driven motor vehicle. Such rotors 10 are preferably operated at speeds of more than 14,000 rpm.

The rotor 10 has one about a rotor axis 12th rotatable rotor shaft 14th on. On the rotor shaft 14th is a sheet metal package 16 arranged and rotationally fixed to the rotor shaft 14th connected. The rotor shaft 14th is formed in one piece in the present embodiment.

The sheet metal package 16 has a plurality of in the axial direction of the rotor 10 laminated core segments arranged one behind the other 18th on. The laminated core segments 18th in turn comprise a plurality of side by side or in the axial direction of the rotor 10 individual sheets arranged one behind the other. The sheet metal package 16 comprises a first end face 20th and one to the first face 20th in the axial direction of the rotor 10 spaced apart second end face 22nd . On the first face 22nd is a first end disk 24 arranged and on the second face 22nd there is a second end plate 26th on.

The first end disk 24 , the laminated core 16 and the second end plate 26th each have an anchor receiving opening 28 on. In the present exemplary embodiment, the rotor comprises 10 a total of six armature receiving openings arranged at a distance from one another in the circumferential direction 28 . In 1 are only the anchor receiving openings 28 in the first end disk 24 visible.

The anchor receiving openings 28 the first end disk 24 , the sheet metal package 16 and the second end plate 26th are arranged and aligned with one another in such a way that a tie rod 30th in the direction of the rotor axis 12th through the receiving opening 28 can be guided to the laminated core 16 in the axial direction of the rotor 10 pre-tension.

The tie rod 30th points at a distal end portion 31 in the longitudinal direction of the tie rod 30th an anchor section 32 on. At one the distal end section 31 remote end of the tie rod 30th is an anchor head 34 educated.

The first end disk 24 points in the area of the anchor receiving opening 28 one to the anchor head 34 corresponding anchor head mount 36 on. The tie rod 30th will proceed with the distal end section 31 through the anchor receiving opening 28 the first end disk 24 through the laminated core 16 and through the second end plate 26th led up to the anchor head 34 into the anchor mount 36 intervenes.

In 2 is a three dimensional view of the tie rod 30th shown. The anchor head 34 has a countersunk head-like or conical configuration that extends in the direction of the anchoring section 32 is designed to taper. The anchoring section 32 has a plurality of circumferential grooves 38 on, in the axial direction of the tie rod 30th are arranged one behind the other. With the circumferential grooves 38 it is not a thread, but an axially symmetrical one around the longitudinal axis of the tie rod 30th recesses running in the circumferential direction.

A detailed view of the anchoring section 32 of the tie rod 30th is in 3 shown. The individual grooves 38 are in the longitudinal direction of the tie rod 30th arranged side by side or one behind the other. Adjacent to the anchoring section 32 a free end 40 of the tie rod 30th facing, the tie rod points 30th a clamping wedge holder 42 for locking with a tie-rod tensioning device, not shown 44 on. The clamping wedge mount 42 is as a circumferential in the radial direction of the tie rod 30th protruding ring element formed.

4th shows a plan view of the rotor 10 , being on the rotor shaft 14th the laminated core 16 as well as the first end plate 24 and the second end plate 26th are arranged. Through the first end plate 24 , the laminated core 16 and through the second end plate 26th is the tie rod 30th guided and clamps the laminated core 16 in the axial direction of the rotor 10 in front.

5 shows a section through the tie rod 30th in the area of the first end plate 24 . The anchor head 34 is designed like a countersunk head and engages in a corresponding anchor head receptacle 36 the first end disk 24 one. The anchor head 34 preferably closes flush or recessed with one of the laminated core 16 facing away from the free face 45 the first end disk 24 from. At least the anchor head protrudes 34 not over the free face 45 the first end disk 24 over.

6th shows a longitudinal section through the tie rod 30th in the area of the second end plate 26th . The second end disk 26th has one integral with the second end plate 26th trained locking ring 46 on. The tie rod 30th is like this through the laminated core 16 and the second end plate 26th led that the anchoring section 32 in the area of the locking ring 46 is arranged. The locking ring 46 has, at least in sections, a conical outer jacket surface 48 on that towards the free end 40 of the anchoring section 32 or tie rod 30th is designed to taper. In this way, plastic deformation of the locking ring can be carried out via a locking ring molding tool that can be placed on the outer circumferential surface of the locking ring 46 done so that the locking ring 46 a form fit with the anchoring section 32 comes in. Loosening or loosening the tie rod 30th as a result of a rotation or vibration of the rotor 10 can be excluded as the anchoring section 32 no thread, but grooves arranged in the circumferential direction 38 having. Should the tie rod 30th opposite the locking ring 46 around the longitudinal axis of the tie rod 30th twist, there is no loss of prestress of the laminated core with this twist 16 and no loosening of the locking ring 46 from the tie rod 30th hand in hand. In this way, the laminated core is braced 16 provided in the axial direction, which acts permanently.

The 7th to 10 show a method and a device for prestressing the tie rod 30th in the axial direction and for at least partially plastic deformation of the locking ring 46 by means of a locking ring mold 50 . The 7th it can be seen that the tie rod 30th with its anchoring section 32 of a plurality of in the longitudinal direction of the tie rod 30th grooves arranged one behind the other 38 has in the locking ring 46 the second end plate 26th is arranged. At the free end 40 of the tie rod 30th is the circumferential clamping wedge holder 42 educated. The tie rod 30th is at least with the clamping wedge holder 42 over a free end 52 the locking ring 46 that the laminated core 16 is turned away, led out.

The tie rod clamping device 44 as well as the locking ring mold 50 become coaxial with the tie rod 30th arranged.

In 8th it is shown that the tie rod clamping device 44 on the free end 52 the locking ring 46 is lowered. The clamping wedge mount 42 engages between the locking elements 54 the tie rod clamping device 44 one. The locking elements 54 are designed as latching hooks around the circumferential clamping wedge mount 42 to reach behind.

In 9 it is shown that the tie rod clamping device 44 undergoes a shift to the tie rod 30th to tension. The locking elements snap into place 54 the tie rod clamping device 44 with the clamping wedge holder 42 . After the tie rod 30th via the tie rod clamping device 44 is clamped, the locking ring mold 50 towards the locking ring 46 relocated. The locking ring mold 50 has a conical inner lateral surface. By relocating the locking ring mold 50 in the direction
Locking ring 46 , it is plastically deformed in the radial direction in such a way that it forms a form fit with the grooves 38 of the anchoring section 32 of the tie rod 30th comes in. This is how the prestressed tie rod becomes 30th via the at least partially plastically deformed locking ring 46 form-fitting with the anchoring section 32 connected or anchored back. The form-fit back anchoring is permanent due to the fact that the tie rod 30th grooves arranged one behind the other and formed in the circumferential direction 38 has, which are not a thread, but represent or form recesses running in the circumferential direction.

Claims (15)

Rotor (10) for an electrical machine, with a laminated core (16) which is arranged in the axial direction of the rotor (10) and has a first end face (20) and a second end face (22) spaced apart from the first end face (20) in the axial direction of the laminated core (16), a first end disk (24) arranged on the first end face (20), and a second end plate (26) arranged on the second end face (22), wherein the first end disk (24), the laminated core (16) and the second end disk (26) each have an armature receiving opening (28) running parallel to the rotor axis (12) of the rotor (10), and a tie rod (30) guided through the armature receiving opening (28) of the first end disk (24), the laminated core (16) and the second end disk (26) for bracing the laminated core (16) in the axial direction, d u r c h e k e n n n n e i n e t that the tie rod (30) has at least one anchoring section (32) on a distal end section (31) with a locking ring (46) arranged thereon, the anchoring section (32) being designed such that the locking ring (46) cannot be detached from the anchoring section (32 ) connected is. Rotor after Claim 1 , characterized in that the locking ring (46) is an at least partially plastically deformable sleeve that can be slipped onto the anchoring section. Rotor after Claim 1 or 2 , characterized in that the locking ring (46) is integrally connected to the first end plate (24) and / or the second end plate (26). Rotor according to one of the preceding claims, characterized in that the locking ring (46) is arranged on a side of the first end disk (24) and / or the second end disk (26) facing away from the laminated core (16). Rotor according to one of the preceding claims, characterized in that the locking ring (46) is at least partially plastically deformed. Rotor according to one of the preceding claims, characterized in that the locking ring (46) has, at least in sections, a conical outer jacket surface (48) which extends in the direction of a free end (40) of the anchoring section (32) and / or the tie rod (30) is designed to taper. Rotor according to one of the preceding claims, characterized in that the anchoring section (32) has at least one circumferential depression, groove (38) and / or groove formed in the circumferential direction of the tie rod (30). Rotor after Claim 7 , characterized in that the anchoring section (32) has a plurality of circumferential depressions, grooves (38) and / or grooves which are arranged one behind the other in the axial direction of the tie rod (30) and / or spaced apart from one another in the axial direction of the tie rod (30) are. Rotor according to one of the preceding claims, characterized in that the tie rod (30), adjacent to the anchoring section (32), facing a free end (40) of the tie rod (30), has a clamping wedge receptacle (42) for locking with a tie rod tensioning device (44 ) having. Rotor according to one of the preceding claims, characterized in that the tie rod (30) has an anchor head (34) at an end remote from the anchoring section (32), and the first end plate (24) or the second end plate (26) has an anchor head receptacle (36) ), and through the respective other end plate (24, 26) the anchoring section (32) of the tie rod (30) is guided. Rotor after Claim 10 , characterized in that the anchor head (34) has a conical configuration which is tapered in the direction of the anchoring section (32), and the anchor head receptacle (36) is configured to correspond to the anchor head (34). Electrical machine comprising a rotor (10) according to one of the preceding claims. Method for manufacturing a rotor (10) according to one of the preceding claims, comprising the steps: - Provision of a laminated core (16); - Arranging a first end plate (24) on a first end face (20) of the laminated core (16); - Arranging a second end plate (26) on a second end face (22) of the laminated core (16); - Arranging a tie rod (30) through an armature receiving opening (28) of the first end disk (24), the laminated core (16) and the second end disk (26), the tie rod (30) being anchored back at least to the first end disk (24), and an anchoring section (32) of the tie rod (30) is guided through the second end disk (26) and through a locking ring (46); - Pre-tensioning the tie rod (30) and the laminated core (16) in the axial direction of the laminated core (16) and / or the tie rod (30); - At least in sections, plastic deformation of the locking ring (46), so that it is permanently connected to the anchoring section (32) of the tie rod (30). Procedure according to Claim 13 , characterized in that to pretension the tie rod (30) a tie rod tensioning device (44) is placed on a free end section (40) of the tie rod (30), is locked with a clamping wedge receptacle of the tie rod (30), and the tie rod (30) and the laminated core (16) can be prestressed in the axial direction by moving the tie rod clamping device (44). Procedure according to Claim 13 or 14th , characterized in that for at least partial plastic deformation of the locking ring (46) a locking ring forming tool (50) arranged coaxially to the tie-rod tensioning device (44) is placed and / or pressed onto the locking ring (46), and the locking ring (46) is at least partially plastic is deformed.

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