DE741638C - Process for the production of preformed coils consisting of thin wires, in particular for armature electrical machines - Google Patents

Description

Process for the production of preformed coils consisting of thin wires, especially for armatures in electrical machines when winding small machine armatures with half-closed grooves the coil wires are usually inserted one after the other (Instillation). With very thin wires, the wires usually get mixed up, and their insulation layers are also easily injured as a result. If on the other hand, unimpregnated bobbins wrapped with tape with a resulting circular shape Cross-section, a large groove opening is required, which the magnetic Resistance of the air gap greatly increased. With the mostly small air gap then also large additional losses due to the strongly fluctuating losses that this generates Caused slot frequency reversal of magnetization of the pole iron. The banding of the Individual coils require a considerable amount of extra work, especially with thin wires Care.

In the case of bar windings, you already have those that come into the grooves Sides are pressed around with insulating material and these coils are inserted directly into the armature, however, this is not applicable to small coils with many thin wires. Likewise Rubber-molded coils are out of the question for coils with many turns.

According to the invention, the wire is used in particular for fine wire windings first wound on a U-shaped insulation sleeve inserted in the winding form, this is then closed by a cement connection to form a pipe and only then the bobbin is taken out of the winding form.

These coils are kept so narrow with the insulation sleeves that they can also be introduced into semi-closed grooves, but still good Copper filling is achieved because the wires are in the sheath between the flanges the winding form are wrapped tightly. Because of this and because of the usual two Coil sides per slot will have a very good copper filling achieved. The insulation sheaths connected at the edges make such fine wire coils into a solid body that enables comfortable and safe wrapping work.

The insulation sleeves also replace the usual slot lining, or an additional groove insulation is used for higher voltages. The connection of the ends of the insulation sheaths is achieved by covering them in front of them the opposite sides with a fusible lacquer, e.g. B. shellac or a similar binder, or by an intermediate one with one of these Paint covered strips o. B. by means of heating jaw pliers or the winding form. The insulation sleeves «Earth is inserted into the coil forin, the side parts expediently in the grooves of the Spool form flanges are held against displacement during winding. The wrapping of the wire then happens without hindrance.

With the connection still taking place in the winding form via the The wrapping edges standing on the coil wires are also spared the previously usual binding the preformed bobbins before removal from the winding device. The semi-rigid insulation sleeves keep the wire layers tightly together, and the cut profile of the coil remains exist much better than with thread binding, which always strives to reduce the cross-section round and easy to loosen.

Any additional groove linings that may be required can also be used in a similar manner enameled on the outside: a. You will then be expedient through Heillzlötze or mandrels pressed against the groove wall and cemented by pickling. The = smooth, metallic wedges are then when the inside of the lining is dry easily removable. Gluing has the advantage that the groove linings are tight and when inserting the bobbins and bending the forehead heads be able to move more, with which the work result is achieved more reliably and faster will.

The drawing shows, for example, the method according to the invention and devices for their implementation are shown.

In Fig. I, the winding of the coil into a coil shape is a sectional view on the semi-rigid, still open insulation covers at which the Wire is wrapped in it. The ends of the insulation sleeves i (become laterally The Spulenforinflanschen is easily held in place in small grooves.

Fig. 2 shows the fully wound that has been removed from the winding machine Coil shape again, with the casing edges pressed together between two heated jaws b after which a compression between cold surfaces can take place. E. can also the connection by means of a strip covered with putty between the jaws b @ the coil form, which can be heated «-erden on a hot plate.

A66. 3 - an insulation sleeve tc inclines individually on the inside the envelope edges e applied Schinelzkittstott k.

"Fig. Q. Shows a section through one side of the coil with an insulating sleeve again, with an interposed, possibly putty-covered strip s o. The like. Is closed.

Fig. 5 a shows a similar connection of the outer envelope edges by means of a U-shaped strip, while Fig. 5 b one with one encompassing it from the outside U-shaped adhesive strip represents.

Fig. 6 allows the introduction of a coil side covered in this way Recognize in a half-open anchor hat, this groove being an inner or outer anchor can belong.

Fig.; shows an additional lining on the outside hantenflächeeii suitably Schnielzkittstotf applied in a ribbon line machine k.

In A66. S are these additional groove linings with putty surfaces k brought into contact with the \ um = ends with the help of wedge mandrels d and by heating the whole anchor or just the spikes cemented. The groove opening is from these Linings left completely free, so that the introduction of the described semi-rigid wrapped coil sides is not cramped.

The coil sides not lying in the grooves can either be wrapping in similar flexible wrappings or in any other known manner isolate.

The inventive Sptile with wraps in open and Insulation sheaths then connected to form a pipe result in a considerable simplification and improving the winding of small electrical machines and devices with Disc coils.

Claims (4)

PATENT CLAIMS: i. Process for the manufacture of thin wires existing preformed coils. in particular for armature electrical machines, characterized in that that the wire is first placed on a U-shaped insulation sleeve inserted into the winding form wound, this is then closed by a cemented connection to form a pipe and only then is the bobbin removed from the form (Fig. i). 2. Method according to claim i, characterized in that the connection of the casing ends the insulation sheaths takes place by means of fused cement between heated pressing surfaces (Fig. 2). 3. The method according to claim i and 2, characterized in that with armature windings the insulation sleeves also serve as slot insulation. 4. The method according to claim 3, characterized in that in the case of weaker insulation sheaths of the coils, the groove wall is additionally lined with a film fastened by a layer of melted putty with the aid of thorns (Figs. 7 and 8). To distinguish the subject of the application from the state of the art, the following publications were taken into account in the granting procedure: German patent specification ...... No. 337 579; British patent specification \ i r. .a..1.8 51i, ii 896 (igio).