Rotor with connection groove and method for bandaging the rotor

Abstract

A rotor 1 for an electrical machine is proposed, comprising a rotor shaft 4 which defines a rotor rotation axis 100, at least one laminated core 2 which has a central shaft receptacle 3 for rotationally fixedly receiving the rotor shaft 4, a first and a second end plate 7a, 7b which are arranged at the end on an axial end face of the laminated core 2, a thread bandage 11 which surrounds the laminated core 2, the thread bandage being formed by a thread 12 wound in a strand around the rotor 1, the first end plate 7a having a connecting groove 13 which surrounds the rotor rotation axis 100 for connecting a thread start 23 of the thread 12, the connecting groove 13 being filled by repeatedly winding over the thread start 22 to such an extent that a flush transition for the thread bandage 11 to the laminated core 2 is formed.

Description

[0001] The invention relates to a rotor for an electrical machine having the features of claim 1. Furthermore, the invention relates to a method for bandaging the rotor.

[0002] Rotors for electrical machines are known. These typically comprise a rotor core formed from several individual laminations stacked one above the other. The rotor core has several circumferentially distributed magnetic pockets for accommodating permanent magnets. For rotors of permanently excited synchronous machines (PSMs), so-called buried permanent magnets are generally used, which are embedded within the rotor core. Furthermore, it is known to supplement the buried permanent magnets with surface magnets to improve efficiency. These surface magnets are arranged on the outside of the rotor core and secured by bandaging the rotor core. Bandaging the rotor core achieves particularly high mechanical strength and speed stability.

[0003] The document DE 102 16 856 A1 discloses a rotor device for electrical machines with a cylindrical rotor core device having an end face, a plurality of permanent magnets arranged on the outer circumference of the rotor core device, and a bandage wound around the rotor core device in such a way that it fixes the permanent magnets on the outer circumference of the rotor core device, wherein one end of the bandage is arranged near the end face, wherein a retaining ring is arranged radially above the end of the bandage and presses the end of the bandage against the rotor core device.

[0004] The object of the invention is to create a rotor of the type mentioned above, which is characterized by a cost-effective and compact design as well as simple bandaging.

[0005] This object is achieved by a rotor having the features of claim 1 and a method having the features of claim 12. Further features, advantages, and effects of the invention are described in the subclaims and the description with the accompanying figures.

[0006] The subject matter of the invention is a rotor which is designed and / or suitable for an electric machine. In particular, the electric machine is designed and / or suitable for an electric axle drive and / or for driving a motor vehicle. The electric machine is preferably designed as an internal rotor, wherein the rotor is arranged radially inside a stator. For example, the electric machine can be designed as a traction machine, also known as a separate motor generator (SMG). The electric machine is particularly preferably designed as a permanent magnet synchronous machine, or PSM for short. An optional subject matter of the invention relates to an electric machine with the rotor.

[0007] The rotor has a rotor shaft which defines a rotor axis of rotation. The rotor shaft can be designed in one or more parts. In particular, the rotor shaft essentially has a shaft section for receiving a laminated core and a first and a second bearing section for receiving a rotor bearing. In principle, the shaft section and the two bearing sections can be designed as separate components which are connected to one another in a form-fitting and / or force-fitting and / or material-fitting manner at least in the circumferential direction. Alternatively, however, the shaft section and the two bearing sections can also be manufactured from a common material section, in particular in one piece. In particular, the rotor shaft with its axis of rotation defines the rotor axis of rotation.

[0008] Furthermore, the rotor can have a plurality of rotor poles distributed in the circumferential direction, each of which has at least one or exactly one magnet unit. Preferably, the magnet units each comprise one or more pole-generating magnets, in particular permanent magnets. Preferably, the rotor has more than four, preferably more than six, especially more than eight rotor poles, which are evenly distributed in the circumferential direction. Specifically, the rotor has 1n, 2n, 3n, 4n, or 5n magnet units, where n corresponds to the number of rotor poles.

[0009] The rotor has at least or exactly one laminated core. In principle, the rotor can have exactly one laminated core. Alternatively, however, the rotor can also be constructed from at least two partial laminated cores which are arranged together on the rotor shaft in the axial direction with respect to the rotor axis of rotation sequentially and / or in a rotationally fixed manner. For example, the rotor can comprise more than two, preferably more than four, in particular more than six of the partial laminated cores. In particular, it is provided that the laminated core is produced in a single manufacturing process, e.g. by means of stamping and stacking. Alternatively or optionally additionally, the individual laminations can also be joined to one another in a material-to-material bond, e.g. by means of baked varnish or dotted glue.

[0010] The laminated core has a central shaft receptacle, which is designed and / or suitable for the rotationally fixed mounting of the rotor shaft. In particular, the central shaft receptacle extends continuously and / or linearly through the laminated core in the axial direction. The central shaft receptacle is preferably formed as a central through-opening or a central aperture through which the rotor shaft is guided coaxially with respect to the rotor rotation axis. Specifically, the shaft receptacles of all partial laminated cores are congruent in the circumferential direction and aligned with one another in the axial direction.

[0011] The rotor has a first and a second end plate, which are arranged at the end on each axial end face of the laminated core. The two end plates are designed in particular separately from the laminated core and the rotor shaft, in particular the two bearing sections. Preferably, the two end plates each have a shaft receptacle complementary to the rotor shaft, in particular the two bearing sections. In particular, the end plates are each arranged in a rotationally fixed manner on the shaft section and / or one of the bearing sections via the shaft receptacle. In particular, the end plates are designed as so-called balancing plates. The two end plates are preferably made of stainless steel.

[0012] The rotor has a thread bandage surrounding the laminated core, which is formed by a thread wound in a strand around the rotor. Preferably, a lateral surface of the laminated core is completely covered with the thread bandage and / or completely enclosed by the thread bandage. Preferably, the thread is band-shaped and / or has an elliptical or rectangular cross-section. The thread bandage can have a small wall thickness of, for example, less than 5 mm or less than 2 mm in the region of the laminated core. The thread can preferably be formed from carbon fiber or other fiber materials, such as metal fibers or a fiber composite material, for example fiber-reinforced plastic. In particular, the thread can be embedded in a matrix.

[0013] Within the scope of the invention, it is proposed that the first end plate has a connecting groove which runs around the rotor rotation axis and is designed and / or suitable for connecting a thread start of the thread. The connecting groove is filled by repeatedly winding over the thread start to such an extent that a flush transition for the thread bandage to the laminated core is formed. In other words, the connecting groove forms a recess which is offset radially inwards to the lateral surface of the laminated core, in which recess the thread start is connected by repeatedly winding over it and is filled by the multiple overwinding. A flush transition is understood to mean a transition of the thread from the first end plate to the laminated core which is offset-free and / or flat or with a very small diameter jump of less than 0.1 mm, preferably less than 0.05 mm, in particular less than 0.01 mm.In simplified terms, the connection groove is filled with the thread to such an extent that a change from the first end plate to the laminated core occurs at the same or at least approximately the same radial height.

[0014] The invention is based on the finding that a high preload in the bandage is required for bandaged rotors in order to reduce costs, production and curing time. The thread can break if it is pulled over sharp edges. Offset-free transitions are therefore necessary and diameter jumps under pretension of the thread during the winding process must be avoided. For this purpose, it is known to tie the thread to one of the end plates by crossing it over and then applying a tensioning force. However, this requires an end plate with a correspondingly larger axial installation space, which means that the costs for a connection via an end plate increase if these are made wider. Typical widths here are 16 mm, for example. In addition, a radial build-up is created, which unnecessarily increases the wall thickness of the thread bandage.

[0015] By connecting the beginning of the thread within the connection groove and winding it over several times, the thread can be subjected to a high tension force after connection. The advantage of the invention is therefore that the tension force can be applied directly after winding. By filling the connection groove until the thread is flush with the laminated core, the thread can be transferred to the laminated core without offset, thus avoiding the formation of sharp edges. A further advantage is that by winding the thread over several times within the connection groove, a connection is made possible which does not create radial projection and at the same time enables a significantly shorter axial design of the balancing disk. The proposal therefore provides a rotor which can be realized with the smallest possible installation space and material usage.

[0016] In a specific implementation, the thread bandage has a connecting section and a winding section, wherein the connecting section completely fills the connecting groove and the winding section surrounds the laminated core in axial overlap with the connecting section. In particular, the connecting section is to be understood as the part of the thread bandage which is received in the axial and radial directions within the receiving groove. In particular, the winding section is to be understood as the part of the thread bandage which extends in the axial direction over the laminated core or surrounds the laminated core. In particular, the winding section forms a substantially cylindrical body which is formed by the thread wound onto the outer surface of the laminated core.In particular, the connecting section forms a substantially cylindrical body, which is formed by the thread wound in the connecting groove of the first end plate. The winding section can be constructed in one or more layers. Preferably, the connecting section merges directly into the winding section when the thread emerges from or leaves the connecting groove. By filling the connecting groove, the tension force of the thread required for the winding section can be applied to the thread directly at the beginning of the winding process, thereby achieving a uniform force distribution across the winding section onto the laminated core.

[0017] In one specific embodiment, the winding section at least partially covers the first and second end plates in the axial direction relative to the rotor rotation axis. In other words, the winding section extends in the axial direction beyond the axial length of the laminated core. Preferably, the winding section has a constant and / or consistent winding thickness over the entire axial length of the laminated core. Optionally, the winding section has a winding thickness that decreases and / or falls axially outwards in the region of the two end plates. In particular, the thread start and / or the thread end are arranged outside the axial end of the laminated core.Due to the axial extension of the winding section beyond the laminated core to the two end plates, a particularly uniform force distribution can be achieved, since the winding thickness, which decreases at the end, is preferably arranged exclusively in the area of the end plate and thus does not contribute to prestressing the laminated core.

[0018] In a further development, it is provided that the first and second end plates have an axial bandage stop for the winding section. In particular, the axial bandage stop serves to prevent the thread from slipping off the end plates. The bandage stop preferably extends circumferentially in a radial plane of the rotor axis of rotation. In particular, the bandage stop of the first end plate extends in the radial direction over the connection section and at least in sections over the winding section. In particular, the bandage stop of the second end plate extends in the radial direction at least in sections over the winding section. In other words, the bandage stops have a smaller outer diameter than the thread bandage. In particular, the outer diameter of the bandage stops is at least one end-side, reduced outer diameter of the winding section.For example, the first and second bandage stops are formed by a circumferential rim, flange, or the like. These bandage stops ensure axial securing of the thread bandage and prevent the thread from slipping off the end.

[0019] In a further development, the first end plate has an annular shoulder running around the rotor rotation axis, the connecting groove being delimited in one axial direction by the annular shoulder and in an axially opposite direction by the laminated core. In other words, the connecting groove is delimited in the axially opposite direction by an axial end face of the laminated core. In particular, the band stop of the first end plate is co-formed by the annular shoulder. Alternatively, the band stop is formed directly onto the annular shoulder. Particularly preferably, the annular shoulder and the band stop extend in a common radial plane. Because the connecting groove is axially delimited by the laminated core or co-formed by the laminated core, the axial end plate can be designed with a short axial length.

[0020] In another specific implementation, the connecting groove has an axial groove width that corresponds at least to or exactly to 1.5 times the thread width of the thread. Specifically, this means that for a thread width of, for example, 3 mm, the connecting groove has an axial groove width of 4.5 mm. Alternatively, or optionally, the axial groove width corresponds to less than twice the thread width. This ensures an overlap when winding over the thread beginning or the thread itself.

[0021] In a further embodiment, the connection slot has a radial slot depth that corresponds to at least or exactly 3 times the thread thickness of the thread. In concrete terms, this means that for a thread thickness of, for example, 0.2 mm, the connection slot has a radial slot depth of 0.6 mm. In other words, the connection section has at least three thread layers. Alternatively, however, the radial slot depth can also correspond to more than 3 times the thread thickness, e.g. 4 times, 5 times, etc. In particular, the slot depth of the connection slot is defined by the radial offset between the outer surface and the slot base. This ensures that the beginning of the thread is wound over at least twice before it transitions into the winding section. In addition, if the slot depth is designed based on the thread thickness, a virtually flush transition to the laminated core is guaranteed.

[0022] In a further specific implementation, it is provided that the first and / or second end plate has an axial disc width that corresponds at least to or exactly to twice the thread width. Specifically, this means that the first and / or second end plate, for a thread width of, for example, 3 mm, has an axial disc width of 6 mm. In particular, the annular shoulder and / or the drum stop has an axial stop width of more than 1 mm and / or less than 2 mm. The axial disc width is preferably composed of the axial groove width and the axial stop width.

[0023] In a specific embodiment, the thread is formed as a roving with at least or exactly 12,000 filaments, also referred to as 12K roving. Preferably, the thread is formed as a roving ribbon. Ribbons are particularly characterized by the fact that the thread width is greater than the thread gauge or thickness. For example, a 12K roving, viewed in cross-section, has the dimensions 3 x 0.2 mm. Alternatively, the thread can also be formed as a 24K roving.

[0024] In a further development, the thread is pre-impregnated with a matrix. In particular, the thread is designed as a pre-impregnated roving, also known as a towpreg. In other words, the thread is already embedded in the matrix before deposition. The matrix can be formed from a resin, preferably an epoxy resin. In particular, the pre-impregnated thread, preferably the thread beginning and / or the thread end, can be self-adhesively bonded or fixed to the rotor via the matrix. This allows the thread to be securely positioned or held in position during bonding, with the matrix completely curing in a subsequent curing process.

[0025] In a further embodiment, the second end plate is arranged with a flush transition for the thread bandage to the laminated core. In particular, the winding section extends axially without offset and / or flat from the laminated core to the second end plate. The flush transitions of the winding section from the first end plate to the laminated core and from the laminated core to the second end plate ensure that the thread bandage does not have any flare at the ends and that no edges that could damage the thread are formed during the winding process.

[0026] Another object of the invention relates to a method for bandaging a rotor, as already described above, in which the beginning of the thread is tied within the connecting groove; the connecting groove is first filled by repeatedly winding the thread over the beginning of the thread; and the laminated core is then wrapped with the thread to form the thread bandage. In particular, first the connecting section is formed by filling the connecting groove with the thread and then the winding section is formed by wrapping the thread one or more times around the outer surface of the rotor. In particular, after the connecting groove has been filled, the thread is guided one or more times from one end plate to the other end plate so that at least the laminated core is completely covered with the thread. In particular, the thread is unwound from a roll which is arranged laterally and / or offset from the axis of the rotor.For example, the thread can be unwound from the reel by rotating the rotor. Specifically, during the winding process, the thread is applied to the bandage stop of the first and second end disks by at least or exactly one wrap. This enables the thread bandage, in particular the winding section, to rest flush against the bandage stops. Finally, the thread can be severed, and the thread end can be fixed to the winding section, e.g., during a curing process. Preferably, the thread bandage is cured after wrapping the laminated core. Thus, a method for space-saving application of the thread bandage with high pretension is proposed.

[0027] In a more specific embodiment, the thread is wrapped around the receiving groove for tying the thread start at least or exactly twice, preferably three times. In particular, the thread or the thread start can be inserted into the connection groove without tension at the beginning of the winding process and secured by wrapping it over once or several times. Preferably, the thread start is wrapped over until the thread is flush with the sheet stack or the receiving groove is completely filled with the thread.

[0028] In a specific implementation, the thread is subjected to a tensioning force after the thread start is tied and / or when the thread start overlaps with the thread. In particular, the tensioning force can be applied to the thread directly after the thread start is wound over. This allows the winding section to be created right at the beginning by applying the tensioning force. This allows a thread bandage with a high preload and even force distribution to be produced.

[0029] In another specific implementation, the thread beginning is self-adhesively bonded within the receiving groove. In particular, a pre-impregnated thread, preferably a towpreg, is provided. The matrix preferably has an adhesive force that firmly fixes at least the thread beginning until it is wound over and / or overlapped on the first end plate. This allows for particularly simple winding of the thread without the need for any tools.

[0030] Further features, advantages, and effects of the invention will become apparent from the following description of preferred embodiments of the invention. These show: Fig. 1 is a perspective sectional view of a rotor as an embodiment of the invention; Fig. 2 a detailed view of a first axial end side of the rotor from Fig. 1 in the sectional view; Fig. 3 a detailed view of a second axial end side of the rotor from Fig. 1 in the sectional view; Fig. 4 a schematic plan view of a first end plate of the rotor during bandaging.

[0031] Fig. Figure 1 shows a rotor 1 in a perspective sectional view with respect to a rotor rotation axis 100. The rotor 1 is designed or suitable for an electric machine (not shown) of an electric vehicle. The electric machine can be a permanent magnet synchronous machine.

[0032] The rotor 1 comprises at least one laminated core 2, which is formed by a plurality of individual laminated cores stacked one above the other in the axial direction relative to the rotor rotation axis 100. Several permanent magnets (not shown) can be arranged in the laminated core 2, which are supplemented with so-called surface magnets (not shown) arranged on the outside of the laminated core 2 to improve efficiency.

[0033] The laminated core 2 has a central shaft mount 3, via which the laminated core 2 is non-rotatably mounted on a rotor shaft 4. For this purpose, the rotor shaft 4 is guided coaxially with respect to the rotor rotation axis 100 through the shaft mount 3, with the shaft mount 4 penetrating the laminated core 2 in the axial direction relative to the rotor rotation axis 100. For example, the laminated core 2 and the rotor shaft 4 are positively and / or non-positively connected to one another via the shaft mount 3 in the circumferential direction around the rotor rotation axis 100.

[0034] The rotor shaft 4 has a shaft section 5 designed as a hollow shaft and a first and a second bearing section 6a, 6b, wherein the shaft section 5 and the two bearing sections 6a, 6b are designed as separate components. The two bearing sections 6a, 6b can be connected to the shaft section 5, for example, in a form-fitting and / or force-fitting manner, preferably in a rotationally fixed manner. The two bearing sections 6a, 6b essentially serve to rotatably support the rotor shaft 4 in a housing of the electric machine. For this purpose, a rotor bearing, e.g., a rolling bearing, can be mounted on the first and / or second bearing section 6a, 6b.

[0035] The rotor 1 has a first and a second end plate 7a, 7b, which are arranged at each end on an axial end face of the laminated core 2 coaxially to the rotor rotation axis 100. The two end plates 7a, 7b are designed as balancing plates formed separately from the laminated core 2 or the two bearing sections 6a, 6b. The first end plate 7a is positively supported on a first axial end face in the axial direction between the first bearing section 6a and the laminated core 5 and is supported on the shaft section 5 in a positively locking manner, in particular in a rotationally fixed manner, in the radial direction and in the circumferential direction. The second end plate 7b is positively supported on a second axial end face in the axial direction between the second bearing section 6b and the laminated core 2 and is supported on the second bearing section 6b and / or the shaft section 5 in a positively locking manner, in particular in a rotationally fixed manner, in the radial direction and in the circumferential direction.

[0036] The second bearing section 6b has an axial end stop 8 on its outer circumference, which is designed to run circumferentially around the rotor rotation axis 100. For example, the end stop 8 is formed by an annular shoulder running circumferentially around the rotor rotation axis 100. The end stop 8 serves to axially support the second end plate 7b on the first bearing section 6b. Furthermore, the shaft section 5 has an external thread 9, via which a securing means 10 can be mounted or screwed on. For example, the securing means 10 is formed by a shaft nut. The securing means 10 serves to apply an axial compressive force to the first end plate 7a and thus to the laminated core 2 in order to create a press fit for the laminated core 2 between the two end plates 7a, 7b.

[0037] The rotor 1 also has a thread bandage 11 that surrounds the laminated core 2 on the outer circumference. The bandage 11 serves to hold the individual components of the rotor 1 together and to shield the rotor 1 from heat. For example, the surface magnets (not shown) are fixed to the laminated core 2 by the thread bandage 11. The thread bandage 11 is formed by wrapping the rotor 1 with a carbon fiber thread 12. To attach the thread 12, the first end plate 7a has a connecting groove 13 that runs around the rotor rotation axis 100. The connecting groove 13 is completely filled by repeatedly wrapping the thread 12 over it, so that the thread bandage 11 merges flush with the laminated core 2.

[0038] As in Fig. 2, the thread bandage 11 is divided radially into a connection section 14 and a winding section 15. The connection section 14 forms the part of the thread bandage 11 that is arranged within the connection groove 13 or fills the connection groove 13. The winding section 15 forms the part of the thread bandage 11 that is arranged on a lateral surface 16 of the laminated core 2 or surrounds the laminated core 2. In this case, the winding section 15 is arranged in axial overlap with the connection section 14. In other words, the connection section 14 is arranged flush with the lateral surface 16 of the laminated core 2, with the winding section 15 directly adjoining the connection section 14 and transitioning seamlessly to the laminated core 2. The transition between the connection section 14 occurs when the thread 12 exits the connection groove 13.

[0039] The connection groove 13 is arranged offset from the lateral surface 16 in the radial direction relative to the rotor rotation axis 100, wherein the connection groove 13 is delimited in the axial direction relative to the rotor rotation axis 100 on the one hand by the laminated core 2 and on the other hand by an annular shoulder 17 formed on the first end plate 7a and encircling the rotor rotation axis 100. The connection groove 13 has an axial groove width 18, which corresponds, for example, to 1.5 times the thread width 22 of the thread 12, as in Fig. 4. For example, the thread 12 is a 12K roving with a thread width 22 of approximately 3 mm and a thread thickness of 0.2 mm. A groove depth 19 of the connection groove 13 is defined by the radial offset between the laminated core 2 and the first end plate 7a, whereby the groove depth 19 corresponds, for example, to 3 times the thread thickness. A plate width 20 of the first end plate 7a corresponds, for example, to 2 times the thread width 22. Thus, an end plate 7a with a connection groove 13 is proposed, which is characterized by a small axial plate width 20.

[0040] As in Fig. 3, the second end plate 7b is arranged with a flush transition for the thread bandage 11 to the laminated core 2. The winding section 15 extends in the axial direction with respect to the rotor rotation axis 100 without offset or evenly between the two end plates 7a, 7b, wherein the winding section 15 surrounds the laminated core 2 in axial overlap with the first and second end plates 7a, 7b as well as the connecting section 14.

[0041] To prevent the thread bandage 11 from slipping axially at the axial ends, the first and second end plates 7a, 7b have an axial bandage stop 21a, 21b for the winding section 15. The bandage stops 21a, 21b are each designed as a rim surrounding the rotor rotation axis 100, each extending in a radial plane of the rotor rotation axis 100. The first bandage stop 21a is formed directly onto the annular shoulder 17, with the first bandage stop 21a and the annular shoulder 17 extending in a common radial plane.

[0042] The winding section 15 has an outer diameter at each end that decreases in the direction of the bandage stops 21a, 21b. For this purpose, the thread 12 is applied to the first and second bandage stops 21a, 21b during the winding process, circumferentially by one wrap each in the first layers of the winding section 21a, 21b, and then wound axially offset or spaced apart from the bandage stops 21a, 21b in the last layers. Thus, the bandage stops 21a, 21b can be designed with a smaller outer diameter than the thread bandage 11.

[0043] The following is based on the Fig.4 describes a method for bandaging the rotor 1. In a first method step, a thread start 23 of the thread 12 is inserted into the connection groove 13, wherein the thread 12 is held self-adhesively to the first end plate 7a. For this purpose, the thread 12 is pre-impregnated with a sticky matrix, e.g., an epoxy resin. The connection groove 13 is then filled by repeatedly winding the thread start 23 over with the thread 12, for example twice, until the thread 12 is flush with the laminated core 2 or the outer surface 16, in order to create the connection section 14. Here, the thread 12 is subjected to a tensioning force F after the thread start 23 has been tied and / or when the thread start 23 overlaps. The laminated core 2 is then wrapped several times with the thread 12 to create the winding section 15.During the winding process of the winding section 15, the thread 12 is guided from one bandage stop 21a to the other bandage stop 21b while the rotor 1 rotates. Finally, the thread 12 is severed and the thread bandage 11 is cured.

[0044] In rotors 1 where a high preload in the thread bandage 11 is required to reduce costs, production, and curing time, the thread 12 can break if it is pulled over sharp edges. By tying the thread start 23 in the connection groove 13 and filling the connection groove 13 with the thread 12, a virtually offset-free transition from the end plate 7a to the laminated core 2 is enabled and the formation of sharp edges is avoided. In addition, the costs for a connection via the end plates 7a, 7b increase if it is designed to be wide. By overwinding the thread start 23, the end plate 7a can be designed with a smaller axial disc width 20.In addition, the tensioning force F can be applied directly after the thread start 23 has been wound over, so that the maximum tensioning force F is available on the thread 12 already at the beginning of the winding process for producing the winding section 15 and a high preload can be generated in the thread bandage 11. Reference symbol 1 rotor 2 sheet packages 3 wave recording 4 Rotor shaft 5 wave section 6a, b storage sections 7a, b end plates 8 End stop 9 external threads 10 securing devices 11 Thread bandage 12 threads 13 Connection groove 14 connecting section 15 winding section 16 Shell surface 17 Ring shoulder 18 groove depth 19 groove width 20 disc width 21a, b Bandage stops 22 thread width 23 thread start 100 Rotor rotation axis F clamping force QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 102 16 856 A1

[0003]

Claims

[1] Rotor (1) for an electrical machine, - with a rotor shaft (4) which defines a rotor rotation axis (100), - with at least one laminated core (2) which has a central shaft holder (3) for the rotationally fixed mounting of the rotor shaft (4), - with a first and a second end plate (7a, 7b), which are arranged at the end on each axial end face of the laminated core (2), - with a thread bandage (11) surrounding the laminated core (2), the thread bandage being formed by a thread (12) wound in a strand around the rotor (1), characterized by in that the first end plate (7a) has a connecting groove (13) running around the rotor rotation axis (100) for connecting a thread start (23) of the thread (12), wherein the connecting groove (13) is filled by repeatedly winding over the thread start (22) to such an extent that a flush transition for the thread bandage (11) to the laminated core (2) is formed. [2] Rotor (1) according to claim 1, characterized by in that the thread bandage (11) has a connecting section (14) and a winding section (15), wherein the connecting section (14) completely fills the connecting groove (13) and the winding section (15) surrounds the laminated core (2) in axial overlap with the connecting section (14). [3] Rotor (1) according to claim 2, characterized by that the winding section (15) at least partially covers the first and second end disks (7a, 7b) in the axial direction with respect to the rotor rotation axis (100). [4] Rotor (1) according to claim 2 or 3, characterized by that the first and second end plates (7a, 7b) have an axial bandage stop (21a, 21b) for the winding section (15). [5] Rotor (1) according to one of the preceding claims, characterized byin that the first end plate (7a) has an annular shoulder (17) surrounding the rotor rotation axis (100), wherein the connecting groove (13) is delimited in an axial direction by the annular shoulder (17) with respect to the rotor rotation axis (100) and in an axial opposite direction by the laminated core (2). [6] Rotor (1) according to one of the preceding claims, characterized by that the connecting groove (13) has an axial groove width (18) which corresponds to at least 1.5 times the thread width (22) of the thread (12). [7] Rotor (1) according to one of the preceding claims, characterized by that the connecting groove (13) has a radial groove depth (19) which corresponds to at least 3 times the thread thickness of the thread (12). [8] Rotor (1) according to one of the preceding claims, characterized in that the first and / or the second end disc (7a, 7b) has an axial disc width (20) which corresponds to at least twice the thread width (22). [9] Rotor (1) according to one of the preceding claims, characterized by that the thread (12) is formed as a roving with at least 12,000 filaments. [10] Rotor (1) according to one of the preceding claims, characterized by that the thread (12) is pre-impregnated with a matrix. [11] Rotor (1) according to one of the preceding claims, characterized by that the second end plate (7b) is arranged with a flush transition for the thread bandage (11) to the laminated core (2). [12] Method for bandaging a rotor (1) according to one of claims 1 to 10, in which: - a thread start (23) of the thread (12) is tied within the connection groove (13); - the connecting groove (13) is first filled by repeatedly winding the thread (12) over the thread start (23); - the sheet package (2) is then wrapped with the thread (12) to form the thread bandage (11). [13] Method according to claim 12, characterized by that the receiving groove (13) for tying the beginning of the thread (23) is wrapped at least twice with the thread (12). [14] Method according to claim 12 or 13, characterized by that the thread (12) is subjected to a tensioning force (F) after the thread start (23) has been tied on and / or when the thread start (23) overlaps with the thread (12). [15] Method according to claims 12 to 14, characterized by that the thread beginning (23) is tied self-adhesively within the receiving groove (13).

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