Motor rotor with windings

Abstract

A rotor (1) for an electric machine (100), comprising: a rotor stack (33) having a plurality of pole teeth (5) and windings (11) surrounding the pole teeth (5), a plurality of slot wedges (13) in the grooves (7) between the pole teeth (5), arranged radially above the windings (11), wherein support elements (15) are arranged in the grooves (7) between the windings (11), which are arranged radially between the slot wedges (13) and the rotor stack (33). The rotor has improved performance.

Description

Technical Field

[0001] The invention relates to a rotor with a winding for an electric machine, in particular an electric motor, and to a vehicle with an electric machine, in particular an electric motor, wherein the electric machine has the rotor. Background Art

[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 is, for example, permanently excited, designed as a squirrel-cage rotor, or individually excited. In the case of individually excited rotors, the rotor (or the rotor coil) must be supplied with current, for example, by means of slip rings.

[0004] Document DE 2807728 B1 discloses a rotor with pole teeth, on which a conductor is wound to form a coil. Slot wedges are located between the pole teeth to improve the strength of the rotor. Summary of the invention

[0005] The object of the present invention is to provide a rotor with improved performance. This object is achieved by the device described in the present disclosure.

[0006] A rotor for an electric motor according to the present invention comprises: a rotor stack having a plurality of pole teeth and windings surrounding the pole teeth; and a plurality of slot wedges radially arranged above the windings in grooves between the pole teeth, wherein a support element is arranged in the grooves between the windings, which is radially arranged between the slot wedges and the rotor stack.

[0007] The support elements support the slot wedges on the rotor stack, thereby increasing the strength of the rotor. In addition, the support elements prevent the pole teeth from bending tangentially to each other due to operating forces, which would impair the performance and service life of the rotor.

[0008] Additionally, the support element may consist of a non-conductive material, thereby increasing the insulation between the windings.

[0009] The support element can preferably have at least one recess for compensating for an imbalance of the rotor. Compensating for an imbalance of the rotor caused by the manufacturing process results in an improved operating behavior of the rotor.

[0010] Balancing can be achieved by drilling holes (negative balancing) or filling already existing holes (positive balancing).

[0011] Further preferably, the support element can have at least one tooth radially in the direction of the slot wedge, the tooth being operatively connected to the slot wedge.

[0012] The teeth may be compressed by the slot wedge, thereby securing the slot wedge within the groove.

[0013] In an advantageous embodiment of the invention, the support element can have a clamping point radially in the direction of the rotor stack, which clamping point is operatively connected to the rotor stack.

[0014] By clamping the support element between the slot wedge and the rotor stack, the support element can be protected from falling. For example, the fixing of the slot wedge in the groove in conjunction with the tooth can be further improved by clamping. The support element can preferably have a recess (25) in the direction of the winding.

[0015] The recess follows the outer contour of the winding to ensure the distance between the winding and the support element. Therefore, once the coil has been wound, the support element can be easily inserted axially into the recess without damaging the winding.

[0016] In one embodiment of the present invention, the support element may have at least one recess in the radial direction in order to reduce weight.

[0017] The recesses at these points can reduce the weight of the rotor without adversely affecting the stability of the rotor.

[0018] In a further embodiment of the invention, the pole tooth can have an end which projects out of the winding in the direction of the support element and has a retaining region which engages with the slot wedge.

[0019] The holding area can autonomously hold the slot wedge, thereby facilitating the assembly of the support element. It can also assist in clamping the support element between the slot wedge and the rotor stack.

[0020] The support element can preferably support the slot wedge. In case of rotation of the rotor, the pole teeth may bend tangentially due to operating forces, so that the slot wedge may fall out. This situation is prevented by the support element.

[0021] Further preferably, the at least one tooth may extend only over a region of the support element.

[0022] The local extension of the teeth on the surface of the support element is sufficient for the necessary fixing of the slot wedge. For example, the teeth can be located only at the beginning and end of the support element. In addition to saving material, weight is also reduced by forming the teeth only in certain areas.

[0023] According to the invention, a vehicle comprises an electrical machine, in particular an electric motor, having a rotor according to one of the preferred embodiments described. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A cross section of the rotor is shown.

[0025] Figure 2 A plan view of the rotor is shown.

[0026] Figure 3 Another plan view of the rotor is shown.

[0027] Figure 4 A rotor in an electric motor in a vehicle is shown. DETAILED DESCRIPTION

[0028] Figure 1 A rotor stack 33 with pole teeth 5 is shown, which is mounted, for example, on a rotor shaft 3. The rotor stack 33 and the pole teeth 5 consist of separate conductive laminations in order 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, the ends 31 of the pole teeth 5 protrude out of the windings 11, so that the pole teeth 5 have a mushroom shape.

[0029] A holding region 19 is provided at the end 31 of the pole teeth 5, which holds the slot wedge 13 between two pole teeth 5. The slot wedge 13 covers and thus closes the slot 7. A support element 15 is arranged in each slot 7 and is clamped between the slot wedge 13 and the rotor stack 33 via a clamping point 27.

[0030] The teeth 17 on the support element 15 are compressed by the slot wedge 13 and hold the slot wedge 13 in its position.

[0031] The support element 15 has a recess 23 for compensating the imbalance. On the one hand, the recess 23 can be formed according to the imbalance, ie negative balance, or filled with material according to the imbalance, which is called positive balance.

[0032] Further recesses 21 are provided in the support element 15 , which do not affect the stability but allow for a reduction in weight.

[0033] The support element 15 is also adapted to the outer contour of the winding and therefore has an outer recess 25 .

[0034] exist Figure 2 In the figure, the support element 15 can be seen in the groove 7. In this case, in which the support element 15 is shown in the middle, the slot wedge 13 is missing, which has been omitted for reasons of increased clarity. Since there is no slot wedge 13, the support element 15 can be seen over its entire length. The teeth 17 are located on the upper side at the start and end. Alternatively, the teeth can also extend continuously over the surface.

[0035] The support element 15 is connected to the rotor stack 33 via the clamping points 27 and the use of the slot wedges 13 gives the pole teeth 5 increased strength. In particular, tangential deformations of the pole teeth 5 are minimized.

[0036] The slot wedge 13 is inserted axially into the groove 7 above the support element 15 and below the end 31, held by the holding area 19 and supported by the support element 15. In the process, the teeth 17 are compressed and the slot wedge 13 is fixed. The support element 15 is also fixed in the groove 7 by the clamping that occurs at the clamping point 27.

[0037] Figure 3 A rotor 1 is shown with eight pole teeth 5 and a support element 15 between each pole tooth 5. The slot wedges 13 are located between the ends 31 of the pole teeth, held by the holding areas 19 and supported by the support element 15.

[0038] Figure 4 is a schematic diagram of an exemplary embodiment of a vehicle 103 , for example a hybrid vehicle or an electric vehicle, which comprises an electric machine 100 , in particular an electric motor, wherein the electric machine 100 has an exemplary embodiment of a rotor 1 for driving the vehicle 103 .

Claims

1. A rotor (1) for an electric motor (100), comprising: - a rotor stack (33) having a plurality of pole teeth (5) and windings (11) surrounding the pole teeth (5), - a plurality of slot wedges (13) in the grooves (7) between the pole teeth (5), arranged radially above the winding (11), It is characterized in that A support element (15) is arranged in the groove (7) between the windings (11), which is arranged radially between the slot wedge (13) and the rotor stack (33). The support element (15) has a clamping point (27) radially in the direction of the rotor stack (33), the clamping point (27) being operatively connected to the rotor stack (33), the support element (15) being clamped between the slot wedge (13) and the rotor stack (33) via the clamping point (27); The support element (15) has a recess (25) in the direction of the winding (11), and the recess (25) is along the outer contour of the winding (11) to ensure the distance between the winding (11) and the support element (15); The support element (15) has at least one tooth (17) radially in the direction of the slot wedge (13), the tooth (17) being operably connected to the slot wedge (13), the tooth (17) being compressed by the slot wedge (13), thereby fixing the slot wedge (13) in the groove (7). 2 . The rotor ( 1 ) according to claim 1 , wherein the support element has at least one recess ( 23 ) for compensating for an imbalance of the rotor ( 1 ).

3. The rotor (1) according to claim 1 or 2, wherein the support element (15) has at least one recess (21) in the radial direction for reducing weight.

4. The rotor (1) according to claim 1 or 2, wherein the pole tooth (5) has an end (31) which protrudes beyond the winding (11) in the direction of the support element (15) and has a retaining area (19) which engages with the slot wedge (13).

5. The rotor (1) according to claim 1 or 2, wherein the support element (15) supports the slot wedge (13).

6. The rotor (1) according to claim 1, wherein the at least one tooth (17) extends only over a region of the support element (15).

7. A vehicle (103) comprising an electric machine (100), the electric machine (100) comprising a rotor (1) according to any one of claims 1 to 6.

8. The vehicle (103) of claim 7, wherein the electrical machine (100) is an electric motor.

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