DE3437744A1 - Device for connecting armature winding wires to the laminates of a commutator - Google Patents

Abstract

In order reliably to connect armature winding wires (38) to the laminates (24, 26, 28, 30, 32, 34, 36) of a commutator (22), it is proposed that the armature winding wires (38) be accommodated in a compression space (42) which is bounded on the base side by a laminate (30) and at the sides by displaceably arranged jaws (52, 54) and in which the horn (10) of an ultrasound welding system is moved. <IMAGE>

Description

C 15 Device for connecting armature winding wires with the La me 1 1 s of a collector

20th

The invention relates to an apparatus for manufacturing of electrically conductive and mechanical connection of armature winding wires with the lar.elles of a collector by means of a ultrasonic welding system with a sonotrode and an anvil.

30th

According to DE-OS 30 17426, the connection between the armature winding wires takes place and the lamellas by means of ultrasonic welding, wherein the collector lamellae on a contacting surface of a Sonotrode are unrolled and / or vice versa. It is therefore a very expensive device required to such Procedure to carry out. However, the method described above is in comparison to other known methods of Advantage that during one and the same process the electrically conductive and mechanical connection is made at the same time,

Λ0 without prior stripping of the armature winding wires requirement. In contrast, for example in DE-OS 24 16

411 a method for producing an electrically conductive and mechanical connection between the lamellae of a hook collector and armature winding wires described, in which first the Isolation is removed from the wire ends before they are wrapped around the hooks. The hooks are then bent over and welding. To ensure that the contiguous lamellar ends connected to the wires are not closed Lead short circuits, these are arranged alternately in different levels.

In DE-OS 26 29 538 a process for the production of Describes welded connections between winding ends and a collector, where the winding ends with the collector lugs be connected by means of plasma welding, for example. For this purpose, a welding torch is placed over the zone to be welded pendulously guided. Such a method is time-consuming and particularly unsuitable for hook collectors.

According to DE-OS 27 39 730 it is known to electrically armature windings and to be connected mechanically with commutator segments by means of ultrasonic welding. For this purpose, a pointed one comes in tapered sonotrode with one to be welded onto a lamella Interacting conductors. A rational electrically conductive and mechanical connection is not possible as a result. Use in connection with hook collectors is excluded.

The object of the present invention is to design a device of the type mentioned at the beginning so that a secure connection between the armature winding wires with the fins of a collector takes place without it playing a role whether it is, for example, a hook collector or a groove collector. With In other words, the device should be suitable for securely connecting armature winding wires to the lamellae for any type of collector associate.

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The object is achieved in that above the respective lamella to be connected to the armature winding wires a compression space is formed, the side of at least in each case a movably arranged delimiting element is limited, the upper delimiting surface of a portion of the Sonotrode is formed and the collector itself is anvil.

The proposal according to the invention consequently creates a compression space above the lamella with the armature winding wires is to be welded, formed in order in this the sonotrode and thus the ultrasonic vibrations on the armature winding wires to allow it to act, which ultimately results in the mechanical and electrically conductive connection between the armature winding wires and the respective "lamella" established will. The delimitation elements forming the lateral boundaries are thereby like jaws, preferably designed to be displaceable in two mutually perpendicular planes. Through this is the assembly or removal of the compression space in desired scope possible. For example, the compression space is then fully opened if after this has taken place Ultrasonic welding of a subsequent lamella with anchor wi Clearing wires are to be welded. As soon as the appropriate The lamella is arranged below the sonotrode surface which transmits the ultrasonic vibrations, the delimiting elements are again moved in such a way that the lateral boundaries of the compression space are formed, the the lower edges of each delimiting element facing the lamella rest on or almost against the lamella in order to ensure that that the armature winding wires do not enter the compression space being able to leave.

According to a further embodiment, these are as mentioned preferably designed as jaws limiting elements perpendicular or designed to be displaceable approximately perpendicular to the longitudinal axis of the sonot, with the opening of the compression chamber initially a movement takes place approximately along the tangent, which

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in the contact area between the armature winding wires and the lamella can be placed against them. A movement running perpendicular to this is then carried out, which consequently runs in the direction of the sonotrode.
5

It should also be emphasized that the close distance between the jaws can be adjusted in order to achieve the desired and required scope on the cross-sections of the armature winding wires to be set so that these tightly the compression space can fill out.

Finally, there is another embodiment of the invention characterized in that the the upper boundary surface of the compression space forming section of the sonotrode through a front surface of a projection of the star-shaped sonotrode is formed.

Refinements of the invention also emerge in particular from the method claims.
20th

In the single figure further details, advantages and Features in the invention are illustrated.

So in the drawing in the detail is the front view shown a device according to the invention, the the front surface of a preferably star-shaped et en sonotrode indicates. In the exemplary embodiment, the sonotrode 10 has five projections, which are denoted by the reference symbols 12, 14, 16, 18 and 20 are designated. Located below the sonotrode 10 a section of a commutator or collector 22, its lamellae 24, 26, 28, 30, 32, 34 and 36 with preferably made of copper armature winding wires 38 electrically conductive and should be mechanically connected. The is preferably located vertically below the sonotrode longitudinal axis 39 of the Center 40 of the collector 22, so that in the mechanical interaction basically a lateral counter-bearing for the force

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compensation is not required. Furthermore, the collector 22 forms the counter electrode or the anvil to the sonotrode 10, which is required is to use ultrasonic welding the mechanical Establish a solid and electrically conductive connection between the copper wires 38 and, in the exemplary embodiment, with the lamella 30.

In order to prevent the interaction of the sonotrode 10 with the armature winding wires 38 and thus the counter electrode Collector 22 forming the wires 38 can slide away laterally along the lamellar surface, becomes a compression space 42 formed, the lower boundary surface of the surface 44 of the lamella 30 and the upper boundary surface of the End face 46 of the projection 16 is formed. The lateral boundary surfaces are now due to the facing Areas 48 and 50 formed by delimiting elements 52 and 54, respectively, which preferably have a cuboid shape and are designed as movable jaws. Dab.; I can shift or move the Jaws 52 and 54 take place according to the indicated arrows, i.e. that a movement parallel to the bearing surface of the armature winding wires 38 on the lamellar surface 44 and then this takes place perpendicularly. This movement of the jaws 52 and 54 * ″ is necessary in order to then open or close the compression chamber 48. to close when a welding process is completed or before this is to be carried out.

The formation of the compression space 42 ensures that it is 11 when the projection 16 interacts with the sonotrode 10 the armature winding wires 38 these on the lamellar surface 44 cannot be moved in an uncontrolled manner, which creates a risk would exist that the required mechanical and electrical conductive connection between the armature winding wires 38 and the lamella 30 cannot be brought about. Once the welding process is ended, the sonotrode 10 is preferably of the armature winding wires 38 opened upwards, in order to then remove the jaws 52, 54 in the manner previously described. There-

through the compression space 4 is canceled. Then he can Collector 22 must be rotated so that the next lamella (32 or 28) can be arranged centrally under a projection of the sonotrode 10 in order to be present there but not shown Armature winding wires by bringing the jaws 52, 54 in one Take up the compression space and then be able to carry out the welding process.

1st star-shaped in the embodiment, the sonotrode 10, thus of course also any other shape is suitable ge to realize the inventive teaching. It is only decisive that the sonotrode has a surface which comes into direct contact with the armature winding wires and at the same time forms the upper boundary surface of the compression space.

Claims (6)

Pat en tan sayings 1. Device for the production of electrically conductive and mechanical connection of armature winding wires with the Lamellas of a collector by means of a ultrasonic welding system with a sonotrode and an anvil, characterized, that a compression space (42) is formed above the respective lamella (30) to be connected to the armature winding wires (38), which is laterally bounded by at least one movable delimiting element (52, Si) , the upper delimiting surface U6) by one Section (16) of the sonotrode (10) is formed and the collector (22) itself is the anvil. 30th 2. Device claim 1, characterized, that the limiting elements (52,54) preferably in the form of Jaws are each displaceable in two planes that are preferably perpendicular to one another. ti II. 3. Device claim 2, characterized that the limiting elements (52, 54) perpendicular or approximately are designed to be displaceable perpendicular to the sonot rodenlär.gsachse (39). 4. Apparatus according to claim 1, characterized, that the upper delimiting surface (46) of the compression space (48) forming section of the sonotrode (10) through a The front surface of a projection (16) of the star-shaped sonotrode (10) is formed. 5. A method for producing an electrically conductive and mechanical connection of armature winding wires with the Slats of a collector, carried out with the device according to at least claim 1, characterized, that the armature winding wires to be connected to the lamella (38) prior to ultrasonic welding in a compression chamber be arranged, its cross-section depending on the dimensions of the mechanical and electrical with the lamella Conductive to be connected armature winding wires is set. 6. The method according to claim 5.. ,. characterized, that a section is preferably in the form of a projection Sonotrode into the compression chamber during the welding process to reduce the size of this is lowered. 30th