DE1044222B - Short-circuit ring for switching magnets - Google Patents

Description

In magnet systems for switches, e.g. B. Contactors energized by alternating current will generally a short-circuit ring is provided at the poles of the core. This short-circuit ring creates a Phase shift of the induction flux, making it easier to tighten the armature and preventing it -the hum of the anchor when tightened.

Short-circuit rings on solenoids are exposed to very high mechanical loads, as everyone. single switching shock, the core of the magnet system is also exposed to high acceleration forces. The protruding segments of the short-circuit ring, which is advantageously made of a highly conductive material must spring in on each switching shock. Material that conducts well, however, tires when it is elastic Stress very soon, so that the segments break off frequently. This is mostly the whole Switching device unusable because the short-circuit ring cannot be replaced without an appropriate device can.

For fastening short-circuit rings, it is already known to press the protruding short ring parts so that they are in preformed grooves of the Engage the laminated core body. With this arrangement there is a certain stabilization of the protruding Reached short-circuit ring parts. However, it results that the crystalline structure of the short-circuit ring at this known arrangement is adversely affected by the deformation of the ring head and thus a Fatigue fracture is favored.

The invention relates to a short-circuit ring which stands out against known rings of its kind particularly high mechanical strength. The segments protruding above the magnetic pole are according to the invention provided with an inwardly directed, molded extension, which for itself on Magnet pole attached, e.g. B. is caulked. This inwardly directed extension is not, however, as with the known arrangement, produced by pressing in the protruding segments, rather the short-circuit ring made in the form in which it lies in the magnetic pole, in particular cut out in one piece. This causes a subsequent deformation of the short-circuit ring and thus a change in its crystalline structure avoided. In the simplest case, these processes become one continuous Bridge combined, which, like the two outer parts of the short-circuit ring, in a corresponding Groove of the magnetic pole z. B. is rigidly attached by caulking.

In the drawing, a short-circuit ring according to the invention is shown in FIGS. 1 to 3 and 4 as an exemplary embodiment shown, namely Fig. 1 shows a short-circuit ring for solenoids

Applicant:

Siemens-Schuckertwerke

Corporation,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Albert Schrader, Amberg (Obpf.),
has been named as the inventor

Short-circuit ring which is connected in its center by a crosspiece 1. From Figs. 2 and 3 is to see how such a short-circuit ring on a magnetic pole 3 is attached. The magnetic pole in this case has three grooves in which the two outer conductors 2 and the central web 1 are inserted. Electrically there is between a simple short-circuit ring, i.e. a short-circuit ring without a central web and a short-circuit ring according to the invention with a central web no difference, since in this central web, if it is actually arranged in the middle, no current will flow. In this case, the in This web induced currents directed in opposite directions and of the same size, so that they cancel each other out.

The center bar is advantageously also firmly attached to the magnetic pole. It is easiest to do this by caulking. But it can also be glued into a corresponding groove, e.g. B. with a Ethoxylin-based resin.

There can also be an adhesive bead attached to one of the segments on the outer surface of the magnet leg are provided. The easiest way to do this is to glue the whole ring in at the same time or only the extensions or the central web. An adhesive bead arranged in this way also cushions any vibrations of the segments.

Fig. 4 shows a short-circuit ring in which the two extensions 6, 7 only up to the outer Plates of the magnetic pole are formed reaching. For example, it will be fine in various cases suffice to let the extensions only in the cover plates, which are already somewhat strong, in order to thus the Edge segments of the short-circuit ring to give a better hold.

«09 679/245

The invention can also be implemented in that two extensions 6 are provided on each edge segment are.

Claims (5)

Patent claims: 1. Short-circuit ring, whose segments protruding beyond the magnetic pole with inwardly directed Parts are attached to the magnetic pole by themselves, characterized in that the inwardly directed Parts of the protruding segments as molded, in particular cut, onto the segments Extensions are formed. 2. short-circuit ring according to claim 1, characterized in that the extensions are each in the Center of the segments are arranged. 3. short-circuit ring according to claim 1 and 2, characterized in that the extensions are in grooves of the magnet. "4. short-circuit ring according to claim 1 to 3, characterized in that the two to the opposing segments arranged extensions are combined to form a continuous web. 5. short-circuit ring according to claim 1 to 4, characterized in that the extensions or the continuous web is glued in a corresponding groove of the pole face that also between the Segments and the magnet leg an adhesive connection comes about. Considered publications:
Swiss Patent No. 232 768;
German patent specification No. 861 443. 1 sheet of drawings © «Ο» 679Λ45 1t. 58i