DE202009018610U1 - Rotor for an electric motor - Google Patents

Abstract

Rotor for an electric motor, the rotor having a rotor shaft (1), a rotor winding (2) and a commutator (3), the rotor winding (2) consisting of winding wire with insulation, in particular with enamel insulation, the commutator ( 3) is designed as a hook commutator with commutator bars (4) and commutator hooks (5) for the winding ends (6) of the rotor winding (2) and the winding ends (6) with the inside of the hooks (7, 8) of the respective commutator hooks (5) in the way of hot caulking, characterized in that in each case at least one inside of the hook (7, 8) of the commutator hook (5) has a surface structure which, when positively engaging with the respective winding end (6), points and / or line loads on the winding end (6) and thus a targeted injury, in particular a loosening of the insulation of the winding end (6).

Description

The present invention relates to a rotor for an electric motor according to the preamble of claim 1, an electric motor according to the preamble of claim 6 and a method of manufacturing a rotor according to the preamble of claim 7.

The rotor in question for an electric motor is equipped with a rotor shaft, a rotor winding and a commutator. The rotor cooperates in the usual way with a stator. The electric motor is a pure DC motor or a universal motor.

The well-known rotor ( DE 100 42 512 A1 ), from which the invention proceeds, has the above-mentioned construction. In the present case, the contact of the rotor windings on the commutator is in the foreground.

In the known rotor, the rotor windings of winding wire with a paint insulation to avoid short circuits between the individual windings of the rotor winding. For contacting the winding ends of the commutator is equipped as a so-called "hook commutator". On the one hand, such a hook commutator has commutator bars for engagement with commutator brushes and, on the other hand, commutator hooks for connection to the winding ends of the rotor winding.

For contacting, the winding ends are placed around a respective commutator hook and then connected to the hook inner sides of the respective Kommutatorhakens by way of Heißverstemmens. When hot caulking the respective commutator hook is bent so that it comes to a clamping of the respective winding end in Kommutatorhaken. At the same time the compound is subjected to a heat treatment, here by applying an electrical voltage. The resulting heat development initially leads to a release of the paint insulation and then to a weld-like connection between the coil end and commutator.

A disadvantage of the known rotor is the fact that the energy required for dissolving the paint insulation before it comes to the actual hot caulking is considerable. Furthermore, it can not be ruled out that the insulation of the winding ends in the respectively adjacent region to the commutator hooks is released, which can correspondingly lead to short circuits between adjacent commutator.

It has also been proposed to provide the winding ends with a separate thermal and / or mechanical treatment which dissolves the lacquer insulation before the hot caulking ( WO 90/04864 A1 ). In addition to the flames of the coil ends here the brushing or blasting of the coil ends is proposed to solve the paint insulation. All of these methods are structurally and / or energetically complex.

The invention is based on the problem, the known rotor in such a way and further develop that the insulation of the winding wire in the field of Kommutatorhakens is targeted and solved in a structurally simple and energetically advantageous manner.

The above problem is solved in a rotor according to the preamble of claim 1 by the features of the characterizing part of claim 1.

It is essential to consider designing the commutator hooks in such a way that injury and / or loosening of the insulation of the end of the winding in the immediate area of the commutator hook can be effected by mechanical frictional engagement between the respective commutator hook and the respective winding end, in particular when bending the commutator hook. Specifically, it is proposed that at least one hook inner side of the commutator hook has a surface structure which causes point and / or line loads on the winding end when engaging with the respective winding end. The point and / or line loads in turn cause a targeted injury and preferably a release of the insulation of the winding end.

Numerous advantageous variants are conceivable for the realization of the surface structure. This is the subject matter of claims 2 to 5.

In a particularly preferred embodiment according to claim 3, the surface structure has at least one edge and / or tip projecting in the direction of the respective winding end. Hereby, the above increased loads on the coil ends can be realized in a simple manner.

According to another teaching of independent significance, the above problem is solved by an electric motor according to claim 6.

The proposed electric motor is equipped with the above rotor and has, moreover, the usual components such as stator, yoke package o. The like. On. Reference may be made in full to the comments on the proposed rotor.

According to another teaching, also of independent significance, a method for producing the above rotor according to claim 7 is claimed.

Essential in the proposed method is the fact that prior to the hot caulking and / or during the hot caulking for injury and / or loosening of the insulation point or line loads on the hook inner sides of the respective Kommutatorhakens be applied to the respective winding end.

In the following the invention will be explained in more detail by means of exemplary embodiments. In the drawing shows

1 the upper half of a proposed rotor in a sectional side view and

2 according to the commutator 1 in a sectional view according to the local line AA and in a plan view along the line BB in four side by side illustrated embodiments a), b), c) and d).

The rotor shown in the drawing is associated with an electric motor, which may be configured as a pure DC motor or universal motor. The electric motor is preferably associated with a motor vehicle. Here, the electric motor can be used advantageously in the context of motor vehicle locks, there in particular in the field of central locking drives, opening drives or Zuziehhilfsantrieben application. Other preferred applications are window regulators, sunroof drives, motorized seat adjusters, transmission actuators, damper and door actuators o. Like ..

The rotor is in the usual way with a rotor shaft 1 , a rotor winding 2 and a commutator 3 equipped, the rotor winding 2 consists of winding wire with insulation. The insulation is here and preferably a lacquer insulation.

The commutator 3 is designed as Hakenkommutator and has commutator blades 4 and commutator hooks 5 for the coil ends 6 the rotor winding 2 on. The term "coil ends" is to be understood here broadly and includes winding ends in the narrower sense in principle also winding beginnings. A commutator hook 5 can in this sense one or more winding ends 6 be assigned.

The winding ends 6 are here with the hook inside 7 . 8th the respective commutator hook 5 connected by means of hot caulking. Up to this point, the structure of the rotor corresponds to the known prior art.

According to the proposal, it is now so that in each case at least one hook inside 7 . 8th the commutator hook 5 has a surface structure when engaged with the respective coil end 6 Point and / or line loads on the winding end 6 and thus a targeted injury, in particular a removal of the insulation of the winding end 6 causes.

In general, the above surface structure can be realized in that at least one convex and / or concave shape is or are provided. Particularly preferred variants for this purpose are in 2 shown.

Particularly good results for the release of the insulation can be achieved in that at least one hook inside 7 . 8th a surface structure with at least one in the direction of the respective winding end 6 protruding edge 9 and / or with at least one in the direction of the respective winding end 6 protruding tip 10 having. The edge 9 runs in the area of the hook inside 7 . 8th preferably substantially perpendicular to the extension of the respective winding end 6 , 2a ) shows the design with a single edge 9 , At the in 2 B ) shown embodiment, however, are several, mutually parallel edges 9 intended.

It is also conceivable that the surface structure in question at least one hook inside 7 . 8th has a periodically recurring surface pattern. An example of this is the design of the surface structure in the manner of a knurling. This is exemplary in 2d ).

2c ) shows a surface structure of at least one hook inside 7 . 8th with a single concave shape, the sides each have an edge 9 formed. Here, in principle, a plurality of concave formations may be provided. It is essential that the concave shape or the concave formations here and preferably channel-like substantially perpendicular to the direction of extension of the respective winding end 6 extend or extend.

It is conceivable, after all, that at least one hook inside 7 . 8th has a surface texture with increased roughness. Hereby too, increased point loads can be generated, with the respective load points lying very close to each other.

According to another teaching, which has independent significance, an electric motor with the above rotor is claimed. Reference may be made in full to the comments on the proposed rotor.

According to another teaching, which also has independent significance, a method for producing the above rotor is claimed. Essential here is the fact that the above-described injury to the insulation of the coil ends 6 before and / or during the hot caulking of the coil ends 6 with the hook inside 7 . 8th of the respective commutator hook 5 he follows.

It can be seen from the above illustration that the release of the insulation from the coil ends 6 is implemented according to the proposal in a simple manner and with low energy consumption. Due to the fact that, with a suitable design, a reliable release of the insulation can be realized, at least to a certain extent, before the hot caulking, the energy expenditure required for hot caulking can be considerably reduced. It is also advantageous that the injury to the insulation takes place only where this is absolutely necessary, namely in the immediate area of the hook inner sides 7 . 8th , There is thus no danger of a short circuit between the winding ends 6 two adjacent commutator bars 4 so that the distances between the commutator bars 4 can be kept low. As a result, the resulting commutator builds small overall. On elaborate straightening processes after hot caulking, which serve to ensure sufficiently large distances between the commutator, can be dispensed with.

Finally, it is possible with the proposed solution, the contact resistance between the coil ends 6 and the commutator hook 5 reduce, regardless of variations in the thickness of a paint insulation or of any occurring oxidation of the hook inside 7 . 8th ,

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The 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

• DE 10042512 A1 [0003]
• WO 90/04864 A1 [0007]

Claims (6)

Rotor for an electric motor, wherein the rotor is a rotor shaft ( 1 ), a rotor winding ( 2 ) and a commutator ( 3 ), wherein the rotor winding ( 2 ) consists of winding wire with an insulation, in particular with a paint insulation, wherein the commutator ( 3 ) as a hook commutator with commutator blades ( 4 ) and commutator hooks ( 5 ) for the winding ends ( 6 ) of the rotor winding ( 2 ) and wherein the winding ends ( 6 ) with the hook inside ( 7 . 8th ) of the respective commutator hooks ( 5 ) are connected by means of hot caulking, characterized in that in each case at least one hook inside ( 7 . 8th ) the commutator hooks ( 5 ) has a surface structure which in the frictional engagement with the respective winding end ( 6 ) Point and / or line loads on the winding end ( 6 ) and thus a targeted injury, in particular a release of the insulation of the winding end ( 6 ) causes. Rotor according to claim 1, characterized in that the at least one hook inside ( 7 . 8th ) has a surface structure with at least one convex and / or concave shape. Rotor according to claim 1 or 2, characterized in that the at least one hook inside ( 7 . 8th ) has a surface structure with at least one in the direction of the respective winding end ( 6 ) projecting edge ( 9 ) and / or with at least one in the direction of the respective winding end ( 6 ) above peak ( 10 ) having. Rotor according to one of the preceding claims, characterized in that the at least one hook inside ( 7 . 8th ) has a surface structure in the manner of a knurling. Rotor according to one of the preceding claims, characterized in that the at least one hook inside ( 7 . 8th ) has a surface texture with increased roughness. Electric motor with a rotor, wherein the rotor is a rotor shaft ( 1 ), a rotor winding ( 2 ) and a commutator ( 3 ), wherein the rotor winding ( 2 ) consists of winding wire with an insulation, in particular with a paint insulation, wherein the commutator ( 3 ) as a hook commutator with commutator blades ( 4 ) and commutator hooks ( 5 ) for the winding ends ( 6 ) of the rotor winding ( 2 ) and wherein the winding ends ( 6 ) with the hook inside ( 7 . 8th ) of the respective commutator hooks ( 5 ) are connected by means of hot caulking, characterized in that in each case at least one hook inside ( 7 . 8th ) the commutator hooks ( 5 ) has a surface structure which in the frictional engagement with the respective winding end ( 6 ) Point and / or line loads on the winding end ( 6 ) and thus a targeted injury, in particular a release of the insulation of the winding end ( 6 ) causes.

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