DE1962562U - HIGHLY SENSITIVE MAGNETIC TRIGGER, IN PARTICULAR FOR FAULT CURRENT CIRCUIT BREAKERS. - Google Patents

Description

. "". "". ' - ■ -. "■.:, .. '■ Mannheim', March 15, 1967

STOTZ CONTACT .. ^: . ■ - - ^Pat · ^{Hrb / Ro}

GmbH. : Mp-No. -537/67

MANNHEIM

"Highly sensitive magnetic trigger, in particular for residual current circuit breaker "

The innovation relates to a highly sensitive magnetic Trigger with one of the coils of a trip magnet induced magnetic flux and one of this compensated, the armature to the poles of the tripping ·. Magnets attracting magnetic flux emanating from a permanent magnet, especially for residual current circuit breakers.

Magnetic triggers of this type have previously served as a counterforce a spring acting against the armature force of attraction of the permanent magnet, when the release coils are excited here the force of attraction on the person resulting from the opposing magnetic fluxes is smaller than the Spring force. As a result, under the action of this greater spring force, the armature is removed from the magnetic poles of the electromagnet withdrawn and the release process initiated.

With these magnetic releases triggered by spring force however, the spring force decreases with the armature opening path, as is known from closed-circuit releases. This spring force must therefore be greater in the position of the tightened anchor than at the end of the unlatching process, if over a certain anchor way a certain unlatching force has to be applied. In the case of a "shunt trip, however the force in the anchor rest position is only as great as the unlatching force. With increasing anchor distance, i.e. with the If the air gap is reduced, the force increases to a greater extent than it decreases with a closed-circuit release.

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Another advantage of the shunt release compared to the closed-circuit release is also the fact that the shunt release can be designed with a larger usable anchor path than with a closed-circuit release in which the armature travel is limited by the spring preload travel.

The innovation makes itself the task of taking advantage of the known Maintain highly sensitive magnetic release, but largely eliminate their disadvantages. According to the innovation this is achieved by the fact that a further magnet is provided, whose magnetic flux on the armature one, him from the Poles of the release magnet exerts pulling force. The armature of the release is therefore not only by a spring counterforce, but also withdrawn from its magnetic poles by an additional magnetic opposing force. In this way it is achieved that, in contrast to the use of a spring only with a sloping armature, the magnetic counterforce acting on this with increasing armature travel, can be kept constant or increased. One of the advantages of this arrangement is also that the shutter is like a Shunt release works and the controlled holding force of the release can be kept small.

The additional magnet that pulls the armature can be an electric or be a permanent magnet. The magnetic flux of this is expedient Magnets' adjustable. The path of the anchor can either be straight or run in the shape of an arc of a circle. The entire magnet system is advantageously encapsulated against external influences.

An embodiment of the innovation and its mode of operation is shown in the "drawings in FIGS.

The magnetic release consists of the release ^{magnet 1 made of sheet metal with:} the armature 2 and a shunt 3. A permanent magnet 5 is attached to the legs. The coils 14- arranged on the legs 6 are the trigger coils.

Another magnet 7 is assigned to the armature 2 in such a way that it the anchor restoring force increased. To eliminate external influences, all components are completely closed by a housing 8 and held on a carrier 9 connected to this, so that only the trigger flush 8 connected to the armature 2 protrudes.

The magnetic flux emanating from the permanent magnet 5 leads partly over the legs 4,6 and is through the at the poles overlying anchor 2 closed. Another part of this magnetic flux flows via the shunt 3 · Through this magnetic flux the armature 2 is pulled to the pole 11 and held. The electromagnetic flux generated in the limbs 6 by the coils 14 in the event of excitation also leads via the armature and back via shunt 3. This magnetic flux is directed in such a way that in the legs 6 it encounters that of the permanent magnet 5 outgoing magnetic flux compensated, so that with increasing Excitation the tightening force of the armature 2 is reduced until that of the armature return spring 12 and. the magnet 7 outgoing the retraction force corresponding to the holding force is not reached and thus the armature 2. 'falls and the release via the release plunger 10 executes. The armature 2 is pivotally connected to the release tappet 10 by means of the pins 13 within limits, thus at every time it is switched on, a good contact on the poles 11 is guaranteed is. ■

The required release force c to be applied by the release tappet 10 is constant. If the magnet 17 is ineffective, this force c is to be applied solely by the armature return spring 12, that is, the holding force d of the release ^{magnet 1 will always be greater than the release force c (Fig. 2) due to the spring force curve b up to the release e} . With the cooperation of the magnet 7 (Fig. 3), the retraction force a emanating from this magnet increases as a result of the decreasing air gap to this magnet 7, '

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so that in combination with the force curve "b of the armature return spring 12 practical, any force curve is possible. Thus, the holding force d of the release magnet 1 can also be significant be reduced. This arrangement therefore permits an increase in the sensitivity of the release magnet.

If the permanent magnet 7 is replaced by an electromagnet and if the magnet is excited by the tripping current itself, the required changes as the tripping current increases Holding force of the anchor in terms of increasing retraction force. .

This makes the magnetic release insensitive against vibrations.

Claims (6)

Protection claims 1. Highly sensitive magnetic trigger with one of the Coils of a tripping magnet generated magnetic flux and a compensated by this, the armature to the poles of the ■ Magnetic flux that attracts tripping magnets and emanates from a permanent magnet, in particular for residual current circuit breakers, characterized in that a further magnet (7) is provided, whose magnetic flux acts on the armature (2) and separates it from the poles (11) of the tripping magnet (1). _ "pulling force. exerts. 2 '. , Release according to claim 1, characterized in that the magnet (7) is an electromagnet. 3 »release according to claim 1, characterized in that the magnet (7) is a permanent magnet. 4. Trigger according to claims 2 "and 3, characterized in that that the flux can be adjusted by the magnet (7). 5. Trigger according to claim 1, characterized in that the path of the armature (2) is straight or circular . "■ runs«. ■ ', ■ - ■ .. 6. Trigger according to claim 1, characterized in that the entire magnet system is encapsulated against external influences.