Rotor with windings for electrical machines

Abstract

To achieve rotor characteristics and weight reduction in addition to saving of material of a rotor, and to provide an electrical machine and a vehicle having such a rotor.SOLUTION: A rotor (1) for an electrical machine (100), comprises: a rotor stack (33) with a plurality of pole teeth (5) and windings (11) around the respective pole teeth (5); a plurality of groove wedges (13) which are arranged radially above the windings (11), in grooves (7) between the pole teeth (5). A support element (15) is arranged in the grooves (7) between the windings (11) and radially between the groove wedges (13) and the rotor stack (33).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a rotor having a winding for an electric machine, in particular an electric motor, and to a vehicle equipped with an electric machine, in particular an electric motor, having such a rotor. [Background technology]

[0002] Electric motors are generally known and are increasingly used to drive vehicles. Electric motors consist of a stator and a rotor.

[0003] The rotor may be permanently excited, for example designed as a squirrel-cage rotor, or separately excited. In a separately excited rotor, the rotor (or the rotor coil) must be supplied with current. This is achieved, for example, via slip rings.

[0004] DE2807728B1 (Patent Document 1) discloses a rotor having pole teeth around which an electric wire is wound, the pole teeth and the electric wire forming a coil. A groove wedge is arranged between each pole tooth to increase the strength of the rotor. Due to this structure, the rotor according to the prior art is difficult to reduce in weight and has poor rotation characteristics. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] DE2807728B1 Summary of the Invention [Problem to be solved by the invention]

[0006] It is an object of the present invention to provide a rotor with improved properties, i.e. a rotor, electric motor and vehicle which achieves weight savings in addition to saving rotor material.

[0007] This object is achieved by a device according to the main claim. Advantageous embodiments are the subject matter of the dependent claims. [Means for solving the problem]

[0008] In order to solve the above problems, the rotor for an electric device according to the present invention comprises a rotor stack having a plurality of pole teeth and windings around each of the pole teeth, and a plurality of groove wedges arranged radially above the windings in grooves between the pole teeth, and a support element is arranged in the grooves between the windings and radially between the groove wedges and the rotor stack.

[0009] The support elements support the groove wedges of the rotor stack, thereby increasing the strength of the rotor, and also prevent the teeth from bending tangentially towards each other due to driving forces, thereby improving both rotor performance and life.

[0010] Additionally, the support elements are made of an electrically non-conductive material, thereby improving the insulation between the windings.

[0011] The support element may preferably have at least one recess for compensating for an imbalance of the rotor, the compensation of which may be caused by the manufacturing process leading to an improvement of the operating characteristics of the rotor.

[0012] Balancing may be performed by drilling holes (negative balancing) or by filling holes that already exist (positive balancing).

[0013] More preferably, the support element may have at least one tooth operatively connected to the groove wedge and arranged radially of the groove wedge.

[0014] The teeth may be compressed by the groove wedge, which secures the groove wedge within the groove.

[0015] In an advantageous embodiment of the invention, the support element has clamping points operatively connected to the rotor stack and arranged radially of the rotor stack.

[0016] The support element is clamped between the groove wedge and the rotor stack to prevent the support element from falling out, for example by the clamp further improving the fixing of the groove wedge in the groove together with the tooth. The support element may preferably have a recess in the direction of the winding.

[0017] The recesses follow the contour of the windings and thus ensure a distance between the windings and the support element, so that after the coil has been wound the support element can be easily inserted axially into the grooves without damaging the windings.

[0018] In one embodiment of the invention, the support element may have at least one recess in the radial direction for weight reduction.

[0019] Recesses at these locations allow for reduced rotor weight without adversely affecting rotor stability.

[0020] In another embodiment of the invention, the pole teeth have ends that project beyond the winding towards the support element and have a retention area that engages with the groove wedge.

[0021] The retaining area may autonomously retain the groove wedge, thereby facilitating assembly of the support element, and may also serve to clamp the support element between the groove wedge and the rotor stack.

[0022] The support element may preferably support the groove wedge. During rotation of the rotor, the pole teeth are bent tangentially by the driving forces, which may cause the groove wedge to fall out. This falling out is prevented by the support element.

[0023] More preferably, at least one tooth may extend over an area of ​​the support element.

[0024] It is sufficient for the teeth to extend partially over the surface of the support element to be fixed to the groove wedge. For example, the teeth may be located only at the beginning and end of the support element. By forming the teeth only in a partial area, material savings as well as weight reduction are achieved.

[0025] According to the invention, a vehicle is equipped with an electric machine, in particular an electric motor, having a rotor of one preferred embodiment. [Brief description of the drawings]

[0026] [Figure 1] A cross-sectional view of the rotor is shown. [Diagram 2] 1 shows a plan view of the rotor. [Diagram 3] 4 shows another plan view of the rotor. [Figure 4] 1 shows a rotor of an electric motor in a vehicle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] 1 shows a rotor stack 33 having pole teeth 5 mounted, for example, on a rotor shaft 3. The rotor stack 33 and the pole teeth 5 are made of separate conductive laminations to reduce losses. The windings 11 are wound around the pole teeth 5 in the grooves 7 between the pole teeth 5. Above the windings 11, ends 31 of the pole teeth 5 protrude beyond the top of the windings 11, so that the pole teeth 5 have a mushroom shape.

[0028] At the ends 31 of the pole teeth 5 there are retaining areas 19 which retain the groove wedges 13 between two pole teeth 5. The groove wedges 13 then cover and close the grooves 7. A support element 15 is placed in each groove 7 and is clamped between the groove wedges 13 and the rotor stack 33 via clamping points 27.

[0029] The teeth 17 of the support element 15 are compressed by the groove wedge 13 and fix the position of the groove wedge 13 .

[0030] The support element 15 has recesses 23 that are used to correct the imbalance. The recesses 23 may be formed in response to the imbalance (negative balancing) or may be filled with material in response to the imbalance (positive balancing).

[0031] The support element 15 is also provided with further recesses 21 which do not affect stability but lead to a reduction in weight.

[0032] The support element 15 is also adapted to the contour of the winding 11 and therefore has an external recess 25 .

[0033] Figure 2 shows a support element 15 in a groove 7. For the support element 15 shown in the middle, the groove wedge 13 has been omitted for clarity. By omitting the groove wedge 13, the support element 15 can be shown over its entire length. Teeth 17 are located at the beginning and end of the top. Alternatively, the teeth 17 may be located continuously over the entire face.

[0034] The support element 15 is connected to the rotor stack 33 via clamping points 27 and together with the groove wedges 13 increases the force on the pole teeth 5. In particular, the tangential deformation of the pole teeth 5 is minimized.

[0035] The groove wedge 13 is inserted axially into the groove 7 above the support element 15 and below the end 31, where it is held in the holding area 19 and supported on the support element 15. In the process, the teeth 17 are pressed against and the groove wedge 13 is fixed. By clamping at the clamping point 27, the support element 15 is also fixed in the groove 7.

[0036] 3 shows a rotor 1 having eight pole teeth 5 and a support element 15 between each pole tooth 5. The groove wedges 13 are located between the ends 31 of the pole teeth 5 and are held in the holding areas 19 and supported by the support elements 15.

[0037] FIG. 4 is a schematic diagram showing an exemplary configuration example of a vehicle 103, for example a hybrid or electric vehicle, which is equipped with an electric machine 100, in particular an electric motor, having an exemplary embodiment of a rotor 1 for driving the vehicle 103.

Claims

1. a rotor stack (33) having a plurality of pole teeth (5) and a winding (11) around each of the pole teeth (5); a plurality of groove wedges (13) arranged radially above the windings (11) in the grooves (7) between the pole teeth (5), a support element (15) having at least one tooth (17) is arranged in the groove (7) between the windings (11) and radially between the groove wedge (13) and the rotor stack (33); A holding region (19) is provided at an end (31) of the pole tooth (5) for holding the groove wedge (13) between two adjacent pole teeth (5), The teeth (17) of the support element (15) are compressed by the groove wedge (13), A rotor (1), characterized in that the support element (15) is operatively connected to the rotor stack (33) and is clamped between the groove wedge (13) and the rotor stack (33).

2. 2. The rotor (1) according to claim 1, wherein the support element (15) has at least one recess (23) for compensating for an imbalance of the rotor (1).

3. 3. A rotor (1) according to claim 1 or 2, wherein the support element (15) has at least one tooth (17) operatively connected to the groove wedge (13) and arranged in the radial direction of the groove wedge (13).

4. A rotor (1) according to any one of claims 1 to 3, wherein the support elements (15) are clamped to radially arranged clamping points (27) of the rotor stack (33).

5. A rotor (1) according to any one of the preceding claims, wherein the support element (15) has a recess (25) in the direction of the windings (11).

6. A rotor (1) according to any one of claims 1 to 5, wherein the support element (15) has at least one radial recess (21) for weight reduction.

7. 7. A rotor (1) according to claim 1, wherein the pole teeth (5) are provided with ends (31) which project beyond the windings (11) towards the support element (15) and have a retaining area (19) which engages with the groove wedge (13).

8. A rotor (1) according to any one of the preceding claims, wherein the support element (15) supports the groove wedge (13).

9. A rotor (1) according to any one of the preceding claims, wherein the at least one tooth (17) extends over an area of ​​the support element (15).

10. A vehicle (103) equipped with an electric machine (100), in particular an electric motor, having a rotor (1) according to any one of the claims 1 to 9.

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