Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Plural magnets or flux sources
Patent
1998-08-28
1999-09-28
Gellner, Michael L.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Plural magnets or flux sources
335132, 335180, 335182, 335183, 335229, 335234, 335 78, 335 79, 335 85, 335230, H01H 5122, H01F 708
Patent
active
059595191
DESCRIPTION:
BRIEF SUMMARY
A conventional device is described in German Application No. DE 39 08 319 A1. There, the outer yoke is constructed in a U-shaped fashion. It is situated opposite the other end of the plunger core part in such a way that it is situated at right angles to and adjacent to the latter. A magnetic cylinder is inserted into the axially extending opening of the coil former; a consequence of this design is reduced attractive forces during the winding de-energization. At the same time, the attractive forces are increased during the winding energization with the nominal current, a highly efficient actuation being achieved as a result.
An electromagnetic switching device having an electromagnetic block is also described in U.S. Pat. No. 4,509,026.
Here, the electromagnetic block comprises an armature which has a plunger core, as well as two armature plates which are fastened to the two ends of the plunger core. Also belonging to the electromagnetic block are a winding which is wound around the plunger core of the armature, inner yokes which are arranged at the circumference of the winding and between the two armature plates, and outer yokes which are arranged outside the inner yoke. Permanent magnets are inserted between the inner and the outer yokes. The core is moved in this case between a front position and a rear position, it being retained by the inner and outer yokes when the winding is energized or de-energized, and a contact maker thereby being actuated in order to make or break a contact. The magnetic flux of the permanent magnets is superimposed on the flux of the winding either positively or negatively in this case. However, in the case of this arrangement interspaces or permanent magnets must always be present in the magnetic flux of the winding.
SUMMARY OF THE INVENTION
The present invention relates to an electromagnetic switching device in which an armature is provided in an electromagnetic block at one end of a plunger core part with an armature plate. A winding is wound around a coil former into whose axial opening the plunger core part of the armature is inserted in an axially displaceable fashion. An inner yoke is arranged around the winding and faces the outer surface of the armature plate of the armature. An outer yoke is arranged in such a way that it is situated opposite the inner yoke, a permanent magnet being inserted between said yokes, and that it faces a part of the inner yoke which is situated opposite the armature plate in order to limit the displacement path of the latter, and movable contacts of a contact block are caused by a coupling device, by means of displacing the armature, to make or break contact with fixed contacts.
It is an object of the present invention to create an electric switching device of the above-mentioned type having a magnetic system, in particular a DC magnetic system with the assistance of a permanent magnet, which efficiently actuates a plurality of break contacts and make contacts in conjunction with a low power loss and low space requirement.
The object is achieved according to the present invention by virtue of the fact that the inner yoke is additionally constructed in such a way that it is situated opposite the other end of the plunger core part in such a way that it is situated at right angles to and adjacent to the latter, and that a magnetic cylinder, which has an axial length which is sufficiently larger than the wall thickness of the yoke at the part thereof which faces this other end of the plunger core part, is inserted into the axially extending opening of the core former, surrounding the other end of the plunger core part in the process, with the result that said cylinder is situated at the level of that part of the inner yoke which faces the outer end of the plunger core part.
A sufficient magnetic permeance relative to the passage of the magnetic force lines between the yoke and the plunger core part is ensured by virtue of the fact that the axial length of the magnetic cylinder is sufficiently greater than the wall thickness of the yoke at the
REFERENCES:
patent: 3984795 (1976-10-01), Gaskill
patent: 4509026 (1985-04-01), Matsushita
Gobel Ralph-Ronald
Pfab Hans
Sorgel Norbert
Barrera Raymond
Gellner Michael L.
Siemens AG
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