Rotor for an electrical machine, in particular of a motor vehicle, and motor vehicle

Abstract

The invention relates to a rotor (1) for an electrical machine, comprising a winding (2), a laminated core having a groove (6) in which longitudinal regions (L) of the winding (2) are received, and a closure element (7) by means of which the groove (6) is at least partially closed to the outside in the radial direction (4). The closure element (7) comprises two closure parts (8, 9) arranged one after the other between two wall regions (W1, W2) of the rotor (4) that face one another and delimit the groove (6). A first screw element (13) having a first thread and a second screw element (14) having a second thread screwed to the first thread and arranged between the closure parts (8, 9) are provided, by means of which the closure parts (8, 9) are spread apart by screwing the threads and are thereby pressed against the wall regions (W1, W2).

Description

[0001] The invention relates to a rotor for an electrical machine, in particular of a motor vehicle, according to patent claim 1. Furthermore, the invention relates to a motor vehicle with at least one such electrical machine.

[0002] WO 2018 / 137999 A1 discloses a component of an electrical machine, wherein the component has a plurality of slots extending over an axial extent of the component. The slots accommodate sections of windings formed from wires, wherein the slots filled with the winding sections are each closed by a cover slide. Furthermore, WO 2022 / 023043 A1 discloses a cover slide of a dynamoelectric machine, having a first layer or a second layer that are spaced apart from one another at least in sections. Furthermore, WO 2023 / 110375 A1 discloses a cover slide for a salient-pole rotor of an electrical machine for closing a slot formed between two adjacent salient poles of the salient-pole rotor. DE 976 105 B discloses a slot closure wedge for rotors of electrical machines. DE 6 607 347 U discloses a stator of an electrical machine.DE 493 885 A discloses a re-tensionable slot wedge for electrical machines.

[0003] The object of the present invention is to provide a rotor for an electrical machine and a motor vehicle with at least one such electrical machine, so that a groove of a laminated core of the rotor can be closed in a particularly advantageous manner.

[0004] This object is achieved according to the invention by a rotor having the features of patent claim 1 and by a motor vehicle having the features of patent claim 7. Advantageous embodiments of the invention are the subject of the dependent claims.

[0005] A first aspect of the invention relates to a rotor for an electrical machine, in particular of a motor vehicle. This means that the electrical machine, in its fully manufactured state, comprises the rotor and, for example, also a stator. For example, the rotor can be driven by means of the stator and can therefore be rotated about an axis of rotation relative to the stator. Thus, for example, the motor vehicle, in its fully manufactured state, has the electrical machine, by means of which, for example, the motor vehicle can be driven, in particular purely electrically. The motor vehicle, also simply referred to as a vehicle and designed, for example, as a motor vehicle, in particular as a passenger car, has, for example, in its fully manufactured state at least or exactly two vehicle axles, arranged consecutively and thus one behind the other in the longitudinal direction of the motor vehicle, and simply referred to as axles.Each vehicle axle has at least or exactly two respective vehicle wheels, which are also simply referred to as wheels. The vehicle wheels of the motor vehicle are ground contact elements of the motor vehicle, which are or can be supported on a ground via the ground contact elements downwards in the vertical direction of the motor vehicle. If the motor vehicle is driven along the ground while being supported on the ground via the ground contact elements downwards in the vertical direction of the motor vehicle, the ground contact elements roll, in particular directly, on the ground. For example, exactly two of the vehicle wheels of the motor vehicle can be driven, in particular purely electrically, by means of the electric machine, wherein the vehicle wheels drivable by the electric machine are preferably the vehicle wheels on the same vehicle axle.In particular, the vehicle wheels of the respective vehicle axle are arranged on opposite sides of the motor vehicle in the transverse direction of the motor vehicle. For example, the electric machine can provide drive torques for driving the motor vehicle, in particular the vehicle wheels, via its rotor. Very preferably, the electric machine is designed as a high-voltage component whose electrical voltage, in particular the electrical operating or rated voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and very preferably amounts to several hundred volts.

[0006] The rotor has at least one winding, also referred to as the rotor winding, for generating a magnetic field. This means that the said magnetic field can be generated and thus provided by means of the winding, wherein, for example, the rotor can be driven by means of the magnetic field and can thus be rotated about the axis of rotation relative to the stator. The rotor also has a laminated core, also referred to as the rotor core, by which the winding is carried. This means that the winding, which is formed separately from the laminated core, is held on the laminated core and is thus carried by the laminated core. In particular, for example, the winding is wound around at least a partial region of the laminated core and is thus held on the laminated core.

[0007] The laminated core has at least one slot in which lengths of the winding are accommodated. The slot is also referred to as the first slot. When reference is made to the slot above and below, this means the first slot unless otherwise stated. The lengths of the winding arranged in the slot are also referred to as the first length ranges, whereby when reference is made to the length ranges above and below, this means the first length ranges unless otherwise stated. Furthermore, the winding is also referred to as the first winding. When reference is made to the winding above and below, this means the first winding unless otherwise stated.It is conceivable that the laminated core of the rotor, the axial direction of which coincides with the axis of rotation, has consecutive and, in particular, spaced-apart slots in the circumferential direction of the rotor and the laminated core running around the axis of rotation and thus around the axial direction of the rotor and the laminated core, namely the aforementioned first slot and at least one or more further slots. The slots of the laminated core are, for example, evenly distributed in the circumferential direction of the rotor and, thus, of the laminated core running around the axis of rotation and thus around the axial direction of the rotor. The previous and following statements regarding the first slot can easily be applied to the, in particular respective, further slot and vice versa. The rotor can, for example, have a plurality of windings, namely the aforementioned first winding and at least one or more further windings.It is conceivable that respective length ranges of the winding or windings are accommodated in the slots of the laminated core. The previous and following statements regarding the length ranges, i.e., the first length ranges, can be readily applied to the further length ranges and vice versa. In particular, for example, the slot in the circumferential direction of the rotor, whose radial direction runs perpendicular to the axial direction of the rotor and thus perpendicular to the axis of rotation, is arranged between two teeth of the laminated core that directly follow one another in the circumferential direction and are thus adjacent to one another, wherein, for example, the slot in the circumferential direction of the rotor is delimited on both sides, in particular directly, by the respective teeth.The feature that the teeth follow one another directly in the circumferential direction of the rotor and are thus adjacent to one another means that in the circumferential direction of the rotor, no other tooth of the laminated core is arranged between the teeth that are spaced apart from one another in the circumferential direction of the rotor. For example, the teeth are or form poles of the rotor, also referred to as salient poles or designed as salient poles, so that the rotor is designed, for example, as a so-called pole rotor or salient pole rotor. In this case, it is particularly conceivable for the winding or windings to be wound around the teeth. Since the axial direction of the rotor coincides with the axis of rotation and vice versa, the circumferential direction of the rotor runs around the axis of rotation and thus around the axial direction of the rotor.For example, the circumferential direction of the rotor and the radial direction of the rotor run in a common plane that is perpendicular to the axial direction of the rotor. When reference is made above and below to the axial direction, this means, unless otherwise stated, the axial direction of the rotor and thus of the laminated core. When reference is made above and below to the radial direction, this means, unless otherwise stated, the radial direction of the rotor and thus of the laminated core. When reference is made above and below to the circumferential direction, this means, unless otherwise stated, the circumferential direction of the rotor and thus of the laminated core.

[0008] The rotor also has a closure element formed separately from the laminated core and also separately from the winding, by which the slot is at least partially, in particular at least predominantly and thus at least more than half or completely closed off in the radial direction of the rotor. In particular, for example, the slot is at least partially, in particular at least predominantly and thus at least more than half or completely covered or concealed in the radial direction of the rotor by the closure element and thus closed off. The closure element is also referred to as a cover slide.

[0009] In order to be able to close the groove particularly advantageously, the invention provides that the closure element has two closure parts arranged consecutively in the circumferential direction of the rotor, namely a first closure part and a second closure part. The closure parts are arranged in the circumferential direction of the rotor between two wall regions of the rotor which face one another in the circumferential direction of the rotor and which at least partially and, for example, directly delimit the groove in the circumferential direction of the rotor. For example, the wall regions are wall regions of the laminated core, in particular of the aforementioned teeth. In other words, for example, a first of the wall regions is a wall region of a first of the teeth, between which the groove is arranged in the circumferential direction, and a second of the wall regions is a wall region of a second of the teeth, between which the groove is arranged in the circumferential direction of the rotor.

[0010] However, the wall regions of the rotor are not necessarily wall regions of the laminated core. It is conceivable that the wall regions are wall regions of a device of the rotor that is formed separately from the laminated core, separately from the winding, and separately from the closure element, so that the device forms the wall regions. In this case, for example, the device has a component that is particularly formed in one piece and is made from a single piece and has, i.e. forms, the wall regions. Furthermore, it is conceivable that the device has a first component and a second component that is formed separately from the first component and, for example, at least indirectly, in particular directly, connected to the first component, wherein the first component has, i.e. forms, a first of the wall regions, and wherein the second component has, i.e. forms, a second of the wall regions.

[0011] The closure element also has a first screw element which has a first thread.

[0012] The closure element also has a second screw element which has a second thread corresponding to the first thread. The second screw element is arranged between the closure parts in the circumferential direction of the rotor. The second thread is screwed, in particular directly, to the first thread and vice versa. One of the threads is preferably an internal thread, so that the other thread is preferably an external thread. The internal thread is screwed, in particular directly, into the external thread. For example, the first thread is the internal thread, so that the one facing it is preferably the external thread. Thus, for example, the first screw element is screwed, in particular directly, into the second screw element.By screwing the threads together, i.e., by screwing the threads together, in particular directly, the closure parts are spread apart by means of the second screw element in the circumferential direction of the rotor, in particular away from each other, and are thereby pressed, in particular directly, against the wall regions, so that, for example, the first closure part is pressed, in particular directly, against the first wall region in the circumferential direction of the rotor, and the second closure part is pressed, in particular directly, against the second wall region in the circumferential direction of the rotor. In other words, the closure parts are clamped, in particular directly, against the wall regions in the circumferential direction of the rotor.In other words, the first closure part is pressed, for example, in a first direction coinciding with the circumferential direction of the rotor and extending around the axial direction of the rotor, in particular directly, against the first wall region and is thereby tensioned, and the second closure part is tensioned, in particular directly, against the second wall region and is thereby pressed, in a second direction coinciding with the circumferential direction, extending around the axial direction and opposite the first direction.

[0013] For example, the first screw element is rotatable about a screw rotation axis relative to the second screw element. For example, in a method for producing the rotor, the first screw element is rotated about the screw rotation axis relative to the second screw element, as a result of which the threads and therefore the screw elements are screwed together, in particular directly. The aforementioned plane is also referred to as the first plane. When reference is made previously and hereinafter to the plane, this refers to the first plane unless otherwise stated. For example, the screw rotation axis runs obliquely or perpendicular to the axial direction of the rotor, the axial direction of which runs perpendicular to the first plane. This means in particular that the screw rotation axis runs perpendicular to a second plane, which runs obliquely or perpendicular to the first plane.If the first screw element is rotated about the screw rotation axis relative to the second screw element while the threads are screwed together, in particular directly, this rotation of the first screw element about the screw rotation axis and relative to the second screw element is converted by means of the threads, in particular depending on a direction of rotation in which the first screw element is rotated about the screw rotation axis relative to the second screw element while the threads are screwed together, into a translational movement of the second screw element running along the screw rotation axis and in particular relative to the closure part and, for example, also relative to the first screw element, also referred to as a translational movement.Due to this translational movement of the second screw element along the screw's axis of rotation and relative to the closure parts, the translational movement of which extends outwards in particular in the radial direction of the rotor, the closure parts are or will be spread apart in the circumferential direction of the rotor, in particular away from each other, and thereby, in particular directly, tensioned, i.e., pressed, against the wall areas. As a result, the closure element is or will be fixed particularly firmly and thus particularly securely to the laminated core, so that unwanted detachment of the closure element from the laminated core can be avoided, especially when the rotor rotates at a particularly high speed about the axis of rotation relative to the stator.In particular, by at least partially closing the slot outwards in the radial direction of the rotor, the closure element prevents the longitudinal regions of the winding from undesirably moving out of the slot and / or moving excessively relative to the laminated core, for example when the rotor rotates about the axis of rotation relative to the stator and centrifugal forces thus act outwards on the longitudinal regions in the radial direction of the rotor. Since the invention now makes it possible to fix the closure element particularly firmly and thus particularly securely to the laminated core, undesirable disintegration of the rotor can be avoided, in particular when the rotor rotates about the axis of rotation relative to the stator, for example when the electric machine is operating at a very high speed.

[0014] Since the second screw element is arranged in the circumferential direction between the closure parts, the second screw element is, for example, an insert part which is at least partially arranged in a closure unit of the closure element comprising the closure parts. By means of the insert part, the closure parts are spread apart in the circumferential direction of the rotor, in particular away from one another, by means of the second screw element being screwed, in particular directly, to the first screw element. Because the screw elements are screwed together, in particular directly, the second screw element, for example, is tensioned against the closure parts, in particular directly and, for example, in the circumferential direction and / or in the radial direction of the rotor, as a result of which the closure parts are spread apart in the circumferential direction of the rotor, in particular away from one another, and are thereby tensioned, i.e. pressed, in particular directly, against the wall regions.

[0015] The wall regions are, for example, spaced from one another in the circumferential direction of the rotor when viewed in the aforementioned plane, so that, in particular when viewed in the aforementioned plane, the wall regions are arranged at a distance from one another running in the circumferential direction of the rotor. In this case, for example, the closure parts extend together, i.e. when viewed in total in the circumferential direction of the rotor and, for example, viewed in the aforementioned plane, at least over more than half the distance, in particular at least over more than 70%, very particularly at least over more than 80% and very particularly at least over more than 90% of the distance, as a result of which the groove, particularly viewed in the aforementioned plane in the radial direction of the rotor, is at least predominantly and thus at least more than half covered by the closure parts towards the outside and is thus closed.

[0016] For example, the groove has an extension running in the axial direction of the rotor, also referred to as the axial length or axial extent. It is preferably provided that exactly one closure element in the form of the aforementioned closure element is arranged in the groove, particularly over the entire axial extent of the groove. This allows the number of parts and thus the cost and weight of the rotor to be kept to a particularly low level.

[0017] The screw's rotation axis runs, for example, in the radial direction of the rotor or obliquely to the radial direction of the rotor, in which case the screw's rotation axis preferably runs in the aforementioned plane perpendicular to the axial direction of the rotor. Furthermore, it is conceivable for the screw's rotation axis to run obliquely to the radial direction of the rotor and, for example, also obliquely to the axial direction of the rotor, thereby running in a third plane that runs obliquely to the first plane.

[0018] In order to be able to mount the closure element in a particularly simple manner and thus fix the closure element particularly firmly to the laminated core in a particularly simple manner and subsequently close the groove particularly advantageously, the invention provides that the first screw element is screwed, in particular directly, to the second screw element via the thread in the radial direction of the rotor inwards, whereby the second screw element is tensioned outwards against the closure parts in the radial direction of the rotor, whereby the closure parts are spread in the circumferential direction of the rotor, in particular away from one another, and are therefore tensioned and thus pressed against the wall regions, in particular directly. In this case, the screw rotation axis runs, for example, in the radial direction of the rotor and in the plane running perpendicular to the axial direction.

[0019] It is further provided that the closure parts each have a recess. The respective recess of the respective closure part is open, for example when the respective closure part is viewed alone in the circumferential direction of the rotor and towards the other closure part. The recesses of the closure parts, viewed together, form a receptacle, with the second screw element being arranged in the recesses and thus in the receptacle. This means that a first partial area of the second screw element is arranged in the recess of the first closure part and a second partial area of the second screw element is arranged in the recess of the second closure part. This enables particularly simple assembly of the closure element and thus particularly simple manufacture of the rotor, whereby the groove can be closed in a particularly advantageous manner.

[0020] The invention is characterized in that the respective closure part has a respective surface which at least partially and directly delimits the respective recess of the respective closure part and which, when viewed in the plane running perpendicular to the axial direction of the rotor, runs obliquely to the radial direction. The feature that the respective surface runs obliquely to the radial direction of the rotor when viewed in the said plane is to be understood, for example, that the respective surface runs in a respective surface plane which runs obliquely to the radial direction of the rotor and, for example, parallel to the axial direction of the rotor, and therefore to the axis of rotation. Thus, for example, the surfaces of the closure parts run towards one another outwards in the radial direction of the rotor. Conversely, for example, the surfaces of the closure parts run away from one another inwards in the radial direction of the rotor.The feature that the respective surface runs obliquely when viewed in the said plane running perpendicular to the axial direction of the rotor is to be understood alternatively or additionally as meaning that, when viewed in the plane, the respective surface runs, for example, curved and / or arcuate and, for example, circular, so that a tangent to the respective surface that is tangent to the respective surface and runs in the plane running perpendicular to the axial direction of the rotor runs obliquely to the radial direction of the rotor and, for example, in the said surface plane.Because the respective surface, viewed in the said plane, runs obliquely to the radial direction of the rotor, the following can be achieved in particular: If, for example in the method for producing the rotor and / or while the threads are screwed together, in particular directly, the first screw element is rotated relative to the second screw element, in particular about the screw rotation axis, in such a way that the second screw element is moved translationally outwards in the radial direction of the rotor relative to the closure parts and in particular also relative to the first screw element and in particular along the screw rotation axis, the second screw element is thereby tensioned outwards in the radial direction of the rotor against the surfaces of the closure parts.Since the respective surface of the respective closure part, viewed in the plane, extends obliquely to the radial direction of the rotor, the second screw element being clamped outwardly against the surfaces, in particular directly, in the radial direction of the rotor, spreads the closure parts in the circumferential direction of the rotor, in particular away from each other, and thus, in particular directly, pressed against the wall area. This allows the closure element to be mounted particularly easily, particularly firmly, and securely and fixed to the laminated core, thereby closing the groove particularly advantageously.

[0021] According to the invention, the respective closure part is latched to the respective wall region against which the respective closure part is pressed in the circumferential direction of the rotor, and is thereby positively connected, in that the respective wall region has a respective latching receptacle in which a respective, corresponding latching region of the respective closure part is received in such a way that the respective latching region is latched, i.e., clicked, into the respective, corresponding latching receptacle. This creates a so-called click-and-screw solution.The click and screw solution provides that, in particular initially, the closure parts are locked into the wall areas and thereby connected in a form-fitting manner, in particular in that, for example, a respective locking area of the respective closure part is locked, i.e. clipped, into a corresponding locking receptacle of the respective wall area against which the respective closure part is pressed, whereby the respective closure part is locked into the respective wall area against which the respective closure part is pressed, and thus connected in a form-fitting manner.In particular, while the threads are screwed together, the first screw element is then rotated relative to the second screw element, in particular about the screw rotation axis, in such a way that the second screw element is tensioned against the closure parts, and as a result, the closure parts are spread apart in the circumferential direction of the rotor, in particular away from one another, and thus pressed against the wall regions. As a result, the closure element can be particularly firmly and thus securely fixed to the laminated core. In particular, by locking the closure parts to the wall regions, the closure element is fixed, in particular pre-fixed, to the wall regions and thus to the laminated core. The closure parts can then be spread apart in the manner described by means of the switching elements, without excessive relative movement occurring between the closure element and the laminated core.This makes it particularly easy to install the locking element, saving time and money.

[0022] A further embodiment is characterized in that the closure parts are spaced apart from one another in the circumferential direction of the rotor in first partial regions of the closure parts, so that the first partial regions of the closure parts are spaced apart from one another in the circumferential direction of the rotor. In a second partial region of the closure element adjoining the first partial regions of the closure parts, the closure parts are connected to one another, wherein the second screw element is arranged between the first partial regions in the circumferential direction of the rotor. As a result, the closure parts are elastically deformed when the second screw element is tensioned against the closure parts in order to thereby spread the closure parts in the circumferential direction of the rotor, in particular while the closure parts are connected to one another.For example, the closure parts are elastically deformed by means of the first screw element and are thereby held in, in particular direct, support insert with the wall areas and thus clamped, whereby the closure element can be fixed particularly firmly and thus securely to the laminated core.

[0023] In order to achieve a particularly simple assembly of the closure element, it has proven particularly advantageous if the respective first partial area of the respective closure part has the respective recess of the respective closure part.

[0024] In principle, it would be conceivable for the closure parts to be formed separately from one another and joined, i.e. connected, to one another in the second partial area of the closure element.

[0025] However, in order to be able to close the groove particularly advantageously, it has proven particularly advantageous if the closure parts are formed integrally with one another, i.e., made from a single piece. This means that the closure parts are preferably not formed separately from one another and connected to one another, but rather the closure parts are preferably formed integrally, i.e., in one piece and thus formed from a single piece, so that the closure parts are formed by a one-piece body, thus formed from a single piece and thus integrally manufactured, designed as a monoblock.With regard to the first partial regions and the closure parts and the second partial region of the closure element, this can be understood to mean that the closure parts formed integrally with one another are spaced apart from one another in the circumferential direction of the rotor in the first partial region and are brought together or formed integrally with one another in the second partial region of the closure element, so that, for example, the closure parts are not spaced apart from one another in the second partial region of the closure element.

[0026] In another particularly advantageous embodiment of the invention, the screw elements are formed separately from one another and separately from the closure parts. This ensures a particularly simple and thus time- and cost-effective manufacture of the rotor.

[0027] Finally, it has proven particularly advantageous if the rotor is free of a casting compound, also referred to as a casting compound, which connects the longitudinal regions to one another and is accommodated in the slot, in which the longitudinal regions are embedded. The background to this embodiment is in particular as follows: Typically, the closure element, also referred to as a cover slide, is used to form, in particular together with the aforementioned teeth, an at least substantially closed casting space, in particular in the form of the closed slot. Typically, a casting compound, for example in the form of a resin, in particular a resin mixture, is introduced into the casting space, in particular in the liquid state of the casting compound, in order to embed the longitudinal regions of the winding arranged in the slot in the casting compound and to connect them to one another and, in particular, to fix them relative to one another and / or in the slot. In this way, the winding can be fixed in the slot.

[0028] The closure element of the rotor according to the invention can now be used as a particularly advantageous winding support, by means of which excessive relative movements between the laminated core and the longitudinal sections and / or an undesired movement of the longitudinal sections out of the slot can be avoided. By clamping or pressing the closure parts against the wall sections, the closure element can be fixed to the laminated core simply and in such a firm manner that the closure element can be secured in the slot so advantageously that, for example, the aforementioned casting compound can be dispensed with.In other words, the closure element of the rotor according to the invention can support or stabilize the longitudinal regions in the slot so advantageously, particularly across the entire speed range of the electric machine, that encapsulation in the slot, i.e., the aforementioned casting compound, also referred to as potting compound, can be dispensed with. This allows the weight and cost of the rotor to be kept particularly low.

[0029] A second aspect of the invention relates to a motor vehicle, also referred to simply as a vehicle and preferably designed as a motor vehicle, in particular as a passenger car, which has at least one electric machine having a stator and a rotor according to the first aspect of the invention. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

[0030] Further details of the invention will become apparent from the following description of a preferred embodiment with the accompanying drawings. Fig. 1 a partial schematic and sectional front view of a rotor of an electrical machine, in particular for a motor vehicle.

[0031] Fig. 1 shows a partial schematic front view of a rotor 1 of an electrical machine, in particular of a motor vehicle. In its fully manufactured state, the electrical machine comprises the rotor 1 and a stator, by means of which the rotor 1 can be driven and thus rotated about a rotational axis relative to the stator. Via its rotor 1, whose axial direction coincides with the rotational axis, the electrical machine can, for example, provide drive torques for, in particular, purely electrically driving the motor vehicle. The rotor 1, whose radial direction runs perpendicular to the axial direction of the rotor 1 and thus perpendicular to the rotational axis, has at least one winding 2, by means of which a magnetic field can be generated, i.e., provided, in particular for driving the rotor 1. The axial direction of the rotor 1 runs perpendicular to the image plane of Fig. 1 and is illustrated by an arrow 3. The radial direction of the rotor 1 runs in the image plane of Fig. 1, perpendicular to the axial direction of the rotor 1 and is illustrated by a double arrow 4.

[0032] The rotor 1 has a Fig. 1, to which a so-called star disk 5 is connected in the axial direction of the rotor 1, in particular directly. For example, the star disk 5 is supported directly on an axial end face of the laminated core in the axial direction of the rotor 1, wherein the star disk 5 is connected to the aforementioned axial end face of the rotor 1 in the axial direction of the rotor 1 and the laminated core, and the laminated core is connected to the aforementioned axial end face of the laminated core. The winding 2 is carried by the laminated core. The laminated core has a plurality of teeth which are spaced apart from one another in the circumferential direction of the rotor 1, which runs around the axial direction of the rotor 1 and thus around the axis of rotation, and also has slots which are spaced apart from one another in the circumferential direction of the rotor 1, the slots and the teeth being arranged alternately one after the other in the circumferential direction of the rotor 1.This means, in particular, that exactly one of the slots is arranged between two adjacent teeth of the laminated core in the circumferential direction of the rotor 1. One of the slots is shown in . Fig. 1 and designated 6. It can also be seen that longitudinal regions L of the winding 2 and / or at least one further winding of the rotor 1 are arranged in the slot 6. The winding 2 and / or the further winding are wound around the teeth, between which the slot 6 is arranged in the circumferential direction of the rotor 1, in such a way that respective further longitudinal regions L2 of the winding 2 and / or the further winding protrude in the axial direction from the axial end face of the laminated core. These further longitudinal regions L2 form a winding head W of the winding 2 and / or the further winding.In this case, the star disk 5 has star disk regions which follow one another in the circumferential direction of the rotor 1 and are spaced apart from one another, wherein, for example, exactly one of the respective star disk regions adjoins, in particular, exactly one of the respective teeth of the laminated core in the axial direction of the rotor 1, in particular as an extension of the respective tooth of the laminated core. In this case, for example, the respective star disk region is arranged around the winding overhang W in the axial direction of the rotor 1 between the respective tooth to which the respective star disk region adjoins. The winding 2 and any additional winding which may be provided are formed separately from the laminated core and separately from the star disk 5, which is formed separately from the laminated core, separately from the winding 2 and, if applicable, separately from the additional winding which may be provided.

[0033] The rotor 1 further comprises a closure element 7 formed separately from the winding 2, separately from the laminated core, separately from the star disk 5, and preferably also separately from any additional winding provided, by which the slot 6 is at least partially closed to the outside in the radial direction of the rotor 1. It can be seen that the closure element 7 protrudes into the slot 6.

[0034] In order to be able to close the groove 6 particularly advantageously, the closure element 7 has two closure parts arranged successively in the circumferential direction of the rotor 1, namely a first closure part 8 and a second closure part 9.

[0035] In the Fig. In the embodiment shown in Figure 1, the closure parts 8 and 9 are components of a closure unit 10, which will be explained in more detail below. Fig. 1, the circumferential direction of the rotor 1 and thus of the laminated core, which runs around the axial direction and thus around the axis of rotation, is illustrated by a double arrow 11.

[0036] Out of Fig. 1 that the closure parts 8 and 9 and thus the closure unit 10 are arranged in the circumferential direction of the rotor 1 between two wall regions W1 and W2 of the rotor 1 facing each other in the circumferential direction of the rotor 1 and at least partially delimited by the groove 6 in the circumferential direction of the rotor 1. In principle, it would be conceivable for the wall regions W1 and W2 to be wall regions of the laminated core, so that, for example, the wall region W1 is a wall region of a first of the teeth, between which the groove 6 is arranged in the circumferential direction of the rotor 1, wherein then, for example, the wall region W2 is a wall region of a second of the teeth, between which the groove 6 is arranged in the circumferential direction of the rotor 1. In the Fig. 1, however, a device 12 of the rotor 1 is provided which is formed separately from the laminated core, separately from the winding 2, separately from the closure element 7, and separately from the star disk 5, wherein the device 12, which is formed separately from the winding 2, separately from the laminated core, separately from the star disk 5, and separately from the closure element 7, forms the wall regions W1 and W2. In other words, the wall regions W1 and W2 are wall regions of the device 12. The device 12 has, for example, a component which is formed in one piece, that is to say from a single piece, which is formed separately from the winding 2, separately from the laminated core, separately from the star disk 5, and separately from the closure element 7, and forms the wall regions W1 and W2, so that, for example, the wall regions W1 and W2 are wall regions of the component of the device 12.Furthermore, it would be conceivable for the device 12 to have a first component and a second component, which can be formed separately from the first component, for example, and can be connected at least indirectly, in particular directly, to the first component. The first component and the second component are formed separately from one another, separately from the winding 2, separately from the laminated core, separately from the star disk 5, and separately from the closure element 7, wherein, for example, the first component forms the wall region W1 and the second component forms the second wall region W2. In other words, the wall region W1 is then, for example, a wall region of the first component, wherein, for example, the wall region W2 is then, for example, a wall region of the second component. For example, the components are so-called pole shoes.Thus, it is provided in particular that the wall regions W1 and W2 of the rotor 1 are formed separately from the closure element 7 and in particular also separately from the winding 2.

[0037] The closure element 7 has a first screw element 13, which has a first thread, in this case in the form of an external thread. Furthermore, the closure element 7 has a second screw element 14, which has a second thread corresponding to the first thread, in this case in the form of an internal thread. The screw elements 13 and 14 are formed separately from one another. Furthermore, the respective screw element 13, 14 is formed separately from the closure unit 10 and thus separately from the closure parts 8 and 9. The threads are screwed directly to one another, in this case such that the external thread and thus the screw element 13 is screwed directly into the internal thread and thus the screw element 14. It can be seen that the second screw element 14 is arranged between the closure parts 8 and 9 in the circumferential direction of the rotor 1.By means of the second screw element 14, the closure parts 8 and 9 are spread in the circumferential direction of the rotor 1 by screwing the threads and are thereby spread away from each other, whereby the closure parts 8 and 9 are clamped and thus pressed in the circumferential direction of the rotor 1, in particular directly against the wall regions W1 and W2.In a method for producing the rotor 1, the screw element 13 is rotated about a screw rotation axis S relative to the screw element 14 while the threads are screwed together in such a way that, by means of the screwed together threads, this rotation of the screw element 14 about the screw rotation axis S and relative to the screw element 14 is converted into a translational movement of the screw element 14 along the screw rotation axis S and relative to the closure parts 8 and 9 and in particular also relative to the screw element 13, also referred to as a translational movement, that the screw element 14 is moved outwards along the screw rotation axis S relative to the closure parts 8 and 9 and, for example, also relative to the screw element 13 in the radial direction of the rotor 1 and is thereby tensioned against the closure parts 8 and 9.As a result, the closure parts 8 and 9 are spread apart from each other in the circumferential direction of the rotor 1 and are thereby tensioned, i.e. pressed, against the wall areas W1 and W2. In the case shown in . Fig. 1, the circumferential direction (double arrow 11) runs in a plane which is perpendicular to the axial direction of the rotor 1. The screw rotation axis S runs in the plane and in the radial direction of the rotor 1. The screw element 13 is screwed to the second screw element 14 via the thread in the radial direction of the rotor 1 inwards, as a result of which the second screw element 14 is tensioned outwards in the radial direction of the rotor 1 against the closure parts 8 and 9, as a result of which the closure parts 8 and 9 are spread away from one another in the circumferential direction of the rotor 1 and are therefore pressed, i.e. tensioned, against the wall regions W1 and W2.

[0038] Generally speaking, because the threads are screwed together, in particular directly, the second screw element 14 is clamped, in particular directly, against the closure parts 8 and 9, whereby the closure parts 8 and 9 are spread in the circumferential direction of the rotor 1, in particular away from each other, whereby the closure parts 8 and 9 are clamped, i.e. pressed, in the circumferential direction of the rotor 1, in particular directly, against the wall regions W1 and W2.

[0039] The closure parts 8 and 9 each have a recess 15, 16, which is at least partially and preferably directly delimited by a respective surface 17, 18 of the respective closure part 8, 9. The recesses 15 and 16 form a receptacle 19 of the closure element, wherein the second screw element 14 is arranged in the receptacle 19. In particular, the respective recess 15, 16 is delimited outwardly, in particular directly, in the radial direction of the rotor 1 by the respective surface 17, 18. In this case, the respective surface 17, 18 runs in the aforementioned plane and at an angle to the axial direction of the rotor 1.In the embodiment shown in the figures, the respective surface 17, 18 is circular, in the present case in the shape of a circular segment, so that the feature that the respective surface 17, 18 runs in the said plane and obliquely to the radial direction of the rotor 1 is to be understood that a respective tangent to the respective surface 17, 18 running in the plane and tangent to the respective surface 17, 18 runs obliquely to the radial direction of the rotor 1, wherein in the present case the tangents run towards one another in the plane and in the radial direction of the rotor 1 viewed outwards.This results in the following: If the screw element 13 is rotated about the screw rotation axis S relative to the screw element 14 in such a way that the screw element 14 is clamped outwards in the radial direction of the rotor 1 and in this case directly against the surfaces 17 and 18, the closure parts 8 and 9 are thereby moved a little way away from each other in the circumferential direction of the rotor 1 and thus spread apart from each other and subsequently clamped, i.e. pressed, in particular directly against the wall areas W1 and W2.

[0040] In the Fig. 1, the closure unit 10 is formed in one piece, i.e., made from a single piece, so that in the present case the closure parts 8 and 9 are formed in one piece with each other, thus formed from a single piece. In the first partial regions T1 of the closure parts 8 and 9, the closure parts are spaced apart from each other in the circumferential direction of the rotor 1, wherein the closure parts 8 and 9 are formed in one piece with each other in a second partial region T2 of the closure element 7, which adjoins the first partial regions T1 inwards, in particular in the radial direction of the rotor 1, and are thereby connected to each other. In this case, the respective first partial region T1 of the respective closure part 8, 9 has the respective recess 15, 16 of the respective closure part 8, 9. Furthermore, in the Fig.1, it is provided that the screw elements 13 and 14 are formed separately from one another and each separately from the closure unit 10 and thus from the closure parts 8 and 9. Furthermore, the respective closure part 8, 9 is latched to the respective wall region W1, W2, against which the respective closure part 8, 9 is tensioned and thus pressed in the circumferential direction of the rotor 1, and is thereby positively connected. For this purpose, the respective wall region W1, W2 in the present case has a respective latching receptacle RA, in which a respective, corresponding latching region of the respective closure part 8, 9 is received, such that the respective latching region is latched, i.e. clicked, into the respective, corresponding latching receptacle RA. This creates a click and screw solution for fixing the closure element 7 to the laminated core in the present case by means of the structural device 12.

[0041] The respective closure part 8, 9, in particular the closure unit 10, which is formed in one piece in the present case, is preferably made of a plastic or a metallic material such as a light metal alloy, in particular an aluminum alloy. In particular, it is conceivable for the respective closure part 8, 9, in particular the preferably one-piece closure unit 10, to be formed of a fiber-reinforced plastic. This ensures a particularly firm and thus secure fixation of the closure element 7 to the laminated core, in this case by means of the device 12.

Claims

[1] Rotor (1) for an electrical machine, with at least one winding (2) for generating a magnetic field, with a laminated core carrying the winding (2), which has at least one groove (6) in which longitudinal regions (L) of the winding (2) are accommodated, and with at least one closure element (7) formed separately from the winding (2) and separately from the laminated core, by means of which the groove (6) is at least partially closed to the outside in the radial direction (4) of the rotor (1), wherein: - the closure element (7) has: ◯ two closure parts (8, 9) arranged one after the other in the circumferential direction (11) of the rotor (1) and between two wall regions (W1, W2) of the rotor (4) facing one another in the circumferential direction (11) of the rotor (1) and at least partially delimiting the groove (6) in the circumferential direction (11) of the rotor (1); ◯ a first screw element (13) having a first thread; and ◯ a second screw element (14) having a second thread screwed to the first thread and arranged in the circumferential direction (11) of the rotor (1) between the closure parts (8, 9), by means of which the closure parts (8, 9) are spread in the circumferential direction (11) of the rotor (1) by screwing the threads and are thereby pressed against the wall regions (W1, W2); - the first screw element (13) is screwed inwards to the second screw element (14) via the thread in the radial direction (4) of the rotor (1), whereby the second screw element (14) is tensioned outwards against the closure parts (8, 9) in the radial direction (4) of the rotor (1), whereby the closure parts (8, 9) are spread in the circumferential direction (11) of the rotor (1) and are thereby pressed against the wall regions (W1, W2); - the closure parts (8, 9) each have a recess (15, 16), wherein the recesses (15, 16) of the closure parts (8, 9) form a receptacle (19) in which the second screw element (14) is arranged; and - the respective closure part (8, 9) has a respective surface (17, 18) which at least partially and directly delimits the respective recess (15, 16) of the respective closure part (8, 9) outwards in the radial direction (4) of the rotor (19), which surface runs obliquely to the radial direction (4) of the rotor (1) in a plane running perpendicular to the axial direction (3) of the rotor (1), wherein the second screw element (14) is tensioned outwards against the surfaces (17, 18) in the radial direction (4) of the rotor (1), whereby the closure parts (8, 9) are spread apart in the circumferential direction (11) of the rotor (1) and are thereby pressed against the wall regions (W1, W2);and the respective closure part (8, 9) is locked to the respective wall region (W1, W) against which the respective closure part (8, 9) is pressed, and is thereby positively connected, in that the respective wall region (W1, W2) has a respective locking receptacle (RA) in which a respective, corresponding locking region of the respective closure part (8, 9) is received in such a way that the respective locking region is locked, and thus clicked, into the respective, corresponding locking receptacle (RA); [2] Rotor (1) according to claim 1, characterized byin that the closure parts (8, 9) are spaced apart from one another in the circumferential direction (11) of the rotor (1) in first partial regions (T1) of the closure parts (8, 9) and are connected to one another in a second partial region (T2) of the closure element (7) adjoining the first partial regions (T1), the second screw element (14) being arranged between the first partial regions (T1) in the circumferential direction (11) of the rotor (1). [3] Rotor (1) according to claim 2, characterized by that the respective first partial area (T1) of the respective closure part (8) has the respective recess (15, 16) of the respective closure part (8, 9). [4] Rotor (1) according to one of the preceding claims, characterized by that the closure parts (8, 9) are formed integrally with one another. [5] Rotor (1) according to one of the preceding claims, characterized bythat the screw elements (13, 14) are formed separately from one another and each separately from the closure parts (8, 9). [6] Rotor (1) according to one of the preceding claims, characterized by that the rotor (1) is free of a casting compound connecting the length regions (L) to one another, in which the length regions (L) are embedded. [7] Motor vehicle, with at least one electric machine which has a stator and a rotor (1) according to one of the preceding claims.

Images